mono/mini/mini-s390.c

   1 /*------------------------------------------------------------------*/
   2 /*                                                                  */
   3 /* Name        - mini-s390.c                                        */
   4 /*                                                                  */
   5 /* Function    - S/390 backend for the Mono code generator.         */
   6 /*                                                                  */
   7 /* Name        - Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com) */
   8 /*                                                                  */
   9 /* Date        - January, 2004                                      */
  10 /*                                                                  */
  11 /* Derivation  - From mini-x86 & mini-ppc by -                      */
  12 /*               Paolo Molaro (lupus@ximian.com)                    */
  13 /*               Dietmar Maurer (dietmar@ximian.com)                */
  14 /*                                                                  */
  15 /*------------------------------------------------------------------*/
  16
  17 /*------------------------------------------------------------------*/
  18 /*                 D e f i n e s                                    */
  19 /*------------------------------------------------------------------*/
  20
  21 #define NOT_IMPLEMENTED(x) \
  22         g_error ("FIXME: %s is not yet implemented. (trampoline)", x);
  23
  24 #define EMIT_COND_BRANCH(ins,cond)                                                      \
  25 {                                                                                       \
  26 if (ins->flags & MONO_INST_BRLABEL) {                                                   \
  27         if (ins->inst_i0->inst_c0) {                                                    \
  28                 int displace;                                                           \
  29                 displace = ((cfg->native_code + ins->inst_i0->inst_c0) - code) / 2;     \
  30                 if (s390_is_uimm16(displace)) {                                         \
  31                         s390_brc (code, cond, displace);                                \
  32                 } else {                                                                \
  33                         s390_jcl (code, cond, displace);                                \
  34                 }                                                                       \
  35         } else {                                                                        \
  36                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  37                                      MONO_PATCH_INFO_LABEL, ins->inst_i0);              \
  38                 s390_jcl (code, cond, 0);                                               \
  39         }                                                                               \
  40 } else {                                                                                \
  41         if (ins->inst_true_bb->native_offset) {                                         \
  42                 int displace;                                                           \
  43                 displace = ((cfg->native_code +                                         \
  44                             ins->inst_true_bb->native_offset) - code) / 2;              \
  45                 if (s390_is_uimm16(displace)) {                                         \
  46                         s390_brc (code, cond, displace);                                \
  47                 } else {                                                                \
  48                         s390_jcl (code, cond, displace);                                \
  49                 }                                                                       \
  50         } else {                                                                        \
  51                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  52                                      MONO_PATCH_INFO_BB, ins->inst_true_bb);            \
  53                 s390_jcl (code, cond, 0);                                               \
  54         }                                                                               \
  55 }                                                                                       \
  56 }
  57
  58 #define EMIT_UNCOND_BRANCH(ins)                                                         \
  59 {                                                                                       \
  60 if (ins->flags & MONO_INST_BRLABEL) {                                                   \
  61         if (ins->inst_i0->inst_c0) {                                                    \
  62                 int displace;                                                           \
  63                 displace = ((cfg->native_code + ins->inst_i0->inst_c0) - code) / 2;     \
  64                 if (s390_is_uimm16(displace)) {                                         \
  65                         s390_brc (code, S390_CC_UN, displace);                          \
  66                 } else {                                                                \
  67                         s390_jcl (code, S390_CC_UN, displace);                          \
  68                 }                                                                       \
  69         } else {                                                                        \
  70                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  71                                      MONO_PATCH_INFO_LABEL, ins->inst_i0);              \
  72                 s390_jcl (code, S390_CC_UN, 0);                                         \
  73         }                                                                               \
  74 } else {                                                                                \
  75         if (ins->inst_target_bb->native_offset) {                                       \
  76                 int displace;                                                           \
  77                 displace = ((cfg->native_code +                                         \
  78                             ins->inst_target_bb->native_offset) - code) / 2;            \
  79                 if (s390_is_uimm16(displace)) {                                         \
  80                         s390_brc (code, S390_CC_UN, displace);                          \
  81                 } else {                                                                \
  82                         s390_jcl (code, S390_CC_UN, displace);                          \
  83                 }                                                                       \
  84         } else {                                                                        \
  85                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  86                                      MONO_PATCH_INFO_BB, ins->inst_target_bb);          \
  87                 s390_jcl (code, S390_CC_UN, 0);                                         \
  88         }                                                                               \
  89 }                                                                                       \
  90 }
  91
  92 #define EMIT_COND_SYSTEM_EXCEPTION(cond,exc_name)                       \
  93         do {                                                            \
  94                 mono_add_patch_info (cfg, code - cfg->native_code,      \
  95                                     MONO_PATCH_INFO_EXC, exc_name);     \
  96                 s390_jcl (code, cond, 0);                               \
  97         } while (0);
  98
  99 #undef DEBUG
 100 #define DEBUG(a) if (cfg->verbose_level > 1) a
 101 #define reg_is_freeable(r) ((r) >= 3 && (r) <= 10)
 102 #define freg_is_freeable(r) ((r) >= 1 && (r) <= 14)
 103
 104 /*----------------------------------------*/
 105 /* use s390_r3-s390_r10 as temp registers */
 106 /*----------------------------------------*/
 107 #define S390_CALLER_REGS  (0x03f8)
 108
 109 /*----------------------------------------*/
 110 /* use s390_f2-s390_f14 as temp registers */
 111 /*----------------------------------------*/
 112 #define S390_CALLER_FREGS (0x73f8)
 113
 114 #define S390_TRACE_STACK_SIZE (5*sizeof(gint32)+3*sizeof(gdouble))
 115
 116 /*========================= End of Defines =========================*/
 117
 118 /*------------------------------------------------------------------*/
 119 /*                 I n c l u d e s                                  */
 120 /*------------------------------------------------------------------*/
 121
 122 #include "mini.h"
 123 #include <string.h>
 124
 125 #include <mono/metadata/appdomain.h>
 126 #include <mono/metadata/debug-helpers.h>
 127 #include <mono/metadata/profiler-private.h>
 128 #include <mono/utils/mono-math.h>
 129
 130 #include "mini-s390.h"
 131 #include "inssel.h"
 132 #include "cpu-s390.h"
 133
 134 /*========================= End of Includes ========================*/
 135
 136 /*------------------------------------------------------------------*/
 137 /*                 T y p e d e f s                                  */
 138 /*------------------------------------------------------------------*/
 139
 140 typedef struct {
 141         guint stack_size,
 142               local_size,
 143               code_size,
 144               retStruct;
 145 } size_data;
 146
 147 /*------------------------------------------------------------------*/
 148 /* Used by the instrument_emit_epilog                               */
 149 /*------------------------------------------------------------------*/
 150
 151 enum {
 152         SAVE_NONE,
 153         SAVE_STRUCT,
 154         SAVE_ONE,
 155         SAVE_TWO,
 156         SAVE_FP
 157 };
 158
 159 typedef struct {
 160         int born_in;
 161         int killed_in;
 162         int last_use;
 163         int prev_use;
 164 } RegTrack;
 165
 166 typedef struct InstList InstList;
 167
 168 struct InstList {
 169         InstList *prev;
 170         InstList *next;
 171         MonoInst *data;
 172 };
 173
 174 enum {
 175         RegTypeGeneral,
 176         RegTypeBase,
 177         RegTypeFP,
 178         RegTypeStructByVal,
 179         RegTypeStructByAddr
 180 };
 181
 182 typedef struct {
 183         gint32  offset;         /* offset from caller's stack */
 184         gint32  offparm;        /* offset on callee's stack */
 185         guint16 vtsize;         /* in param area */
 186         guint8  reg;
 187         guint8  regtype;        /* See RegType* */
 188         guint32 size;           /* Size of structure used by RegTypeStructByVal */
 189 } ArgInfo;
 190
 191 typedef struct {
 192         int nargs;
 193         guint32 stack_usage;
 194         guint32 struct_ret;
 195         ArgInfo ret;
 196         ArgInfo args [1];
 197 } CallInfo;
 198
 199 typedef struct {
 200         gint32  gr[5];          /* R2-R6                            */
 201         gdouble fp[3];          /* F0-F2                            */
 202 } __attribute__ ((packed)) RegParm;
 203
 204 /*========================= End of Typedefs ========================*/
 205
 206 /*------------------------------------------------------------------*/
 207 /*                   P r o t o t y p e s                            */
 208 /*------------------------------------------------------------------*/
 209
 210 static guint32 *emit_memcpy (guint8 *, int, int, int, int, int);
 211 static void indent (int);
 212 static void decodeParm (MonoType *, void *, int);
 213 static void enter_method (MonoMethod *, RegParm *, char *);
 214 static void leave_method (MonoMethod *, ...);
 215 static gboolean is_regsize_var (MonoType *);
 216 static void add_general (guint *, size_data *, ArgInfo *, gboolean);
 217 static CallInfo * calculate_sizes (MonoMethodSignature *, size_data *, gboolean);
 218 static void peephole_pass (MonoCompile *, MonoBasicBlock *);
 219 static int mono_spillvar_offset (MonoCompile *, int);
 220 static int mono_spillvar_offset_float (MonoCompile *, int);
 221 static void print_ins (int, MonoInst *);
 222 static void print_regtrack (RegTrack *, int);
 223 static InstList * inst_list_prepend (MonoMemPool *, InstList *, MonoInst *);
 224 static int get_register_force_spilling (MonoCompile *, InstList *, MonoInst *, int);
 225 static int get_register_spilling (MonoCompile *, InstList *, MonoInst *, guint32, int);
 226 static int get_float_register_spilling (MonoCompile *, InstList *, MonoInst *, guint32, int);
 227 static MonoInst * create_copy_ins (MonoCompile *, int, int, MonoInst *);
 228 static MonoInst * create_copy_ins_float (MonoCompile *, int, int, MonoInst *);
 229 static MonoInst * create_spilled_store (MonoCompile *, int, int, int, MonoInst *);
 230 static MonoInst * create_spilled_store_float (MonoCompile *, int, int, int, MonoInst *);
 231 static void insert_before_ins (MonoInst *, InstList *, MonoInst *);
 232 static int alloc_int_reg (MonoCompile *, InstList *, MonoInst *, int, guint32);
 233 static guchar * emit_float_to_int (MonoCompile *, guchar *, int, int, int, gboolean);
 234 static unsigned char * mono_emit_stack_alloc (guchar *, MonoInst *);
 235
 236 /*========================= End of Prototypes ======================*/
 237
 238 /*------------------------------------------------------------------*/
 239 /*                 G l o b a l   V a r i a b l e s                  */
 240 /*------------------------------------------------------------------*/
 241
 242 int mono_exc_esp_offset = 0;
 243
 244 static int indent_level = 0;
 245
 246 static const char*const * ins_spec = s390;
 247
 248 /*====================== End of Global Variables ===================*/
 249
 250 /*------------------------------------------------------------------*/
 251 /*                                                                  */
 252 /* Name         - mono_arch_regname                                 */
 253 /*                                                                  */
 254 /* Function     - Returns the name of the register specified by     */
 255 /*                the input parameter.                              */
 256 /*                                                                  */
 257 /*------------------------------------------------------------------*/
 258
 259 const char*
 260 mono_arch_regname (int reg) {
 261         static const char * rnames[] = {
 262                 "s390_r0", "s390_sp", "s390_r2", "s390_r3", "s390_r4",
 263                 "s390_r5", "s390_r6", "s390_r7", "s390_r8", "s390_r9",
 264                 "s390_r10", "s390_r11", "s390_r12", "s390_r13", "s390_r14",
 265                 "s390_r15"
 266         };
 267         if (reg >= 0 && reg < 16)
 268                 return rnames [reg];
 269         return "unknown";
 270 }
 271
 272 /*========================= End of Function ========================*/
 273
 274 /*------------------------------------------------------------------*/
 275 /*                                                                  */
 276 /* Name         - emit_memcpy                                       */
 277 /*                                                                  */
 278 /* Function     - Emit code to move from memory-to-memory based on  */
 279 /*                the size of the variable. r0 is overwritten.      */
 280 /*                                                                  */
 281 /*------------------------------------------------------------------*/
 282
 283 static guint32*
 284 emit_memcpy (guint8 *code, int size, int dreg, int doffset, int sreg, int soffset)
 285 {
 286         switch (size) {
 287                 case 4 :
 288                         s390_l  (code, s390_r0, 0, sreg, soffset);
 289                         s390_st (code, s390_r0, 0, dreg, doffset);
 290                         break;
 291
 292                 case 3 :
 293                         s390_icm  (code, s390_r0, 14, sreg, soffset);
 294                         s390_stcm (code, s390_r0, 14, dreg, doffset);
 295                         break;
 296
 297                 case 2 :
 298                         s390_lh  (code, s390_r0, 0, sreg, soffset);
 299                         s390_sth (code, s390_r0, 0, dreg, doffset);
 300                         break;
 301
 302                 case 1 :
 303                         s390_ic  (code, s390_r0, 0, sreg, soffset);
 304                         s390_stc (code, s390_r0, 0, dreg, doffset);
 305                         break;
 306
 307                 default :
 308                         while (size > 0) {
 309                                 int len;
 310
 311                                 if (size > 256)
 312                                         len = 256;
 313                                 else
 314                                         len = size;
 315                                 s390_mvc (code, len, dreg, doffset, sreg, soffset);
 316                                 size -= len;
 317                         }
 318         }
 319         return code;
 320 }
 321
 322 /*========================= End of Function ========================*/
 323
 324 /*------------------------------------------------------------------*/
 325 /*                                                                  */
 326 /* Name         - arch_get_argument_info                            */
 327 /*                                                                  */
 328 /* Function     - Gathers information on parameters such as size,   */
 329 /*                alignment, and padding. arg_info should be large  */
 330 /*                enough to hold param_count + 1 entries.           */
 331 /*                                                                  */
 332 /* Parameters   - @csig - Method signature                          */
 333 /*                @param_count - No. of parameters to consider      */
 334 /*                @arg_info - An array to store the result info     */
 335 /*                                                                  */
 336 /* Returns      - Size of the activation frame                      */
 337 /*                                                                  */
 338 /*------------------------------------------------------------------*/
 339
 340 int
 341 mono_arch_get_argument_info (MonoMethodSignature *csig,
 342                              int param_count,
 343                              MonoJitArgumentInfo *arg_info)
 344 {
 345         int k, frame_size = 0;
 346         int size, align, pad;
 347         int offset = 8;
 348
 349         if (MONO_TYPE_ISSTRUCT (csig->ret)) {
 350                 frame_size += sizeof (gpointer);
 351                 offset += 4;
 352         }
 353
 354         arg_info [0].offset = offset;
 355
 356         if (csig->hasthis) {
 357                 frame_size += sizeof (gpointer);
 358                 offset += 4;
 359         }
 360
 361         arg_info [0].size = frame_size;
 362
 363         for (k = 0; k < param_count; k++) {
 364
 365                 if (csig->pinvoke)
 366                         size = mono_type_native_stack_size (csig->params [k], &align);
 367                 else
 368                         size = mono_type_stack_size (csig->params [k], &align);
 369
 370                 frame_size += pad = (align - (frame_size & (align - 1))) & (align - 1);
 371                 arg_info [k].pad = pad;
 372                 frame_size += size;
 373                 arg_info [k + 1].pad = 0;
 374                 arg_info [k + 1].size = size;
 375                 offset += pad;
 376                 arg_info [k + 1].offset = offset;
 377                 offset += size;
 378         }
 379
 380         align = MONO_ARCH_FRAME_ALIGNMENT;
 381         frame_size += pad = (align - (frame_size & (align - 1))) & (align - 1);
 382         arg_info [k].pad = pad;
 383
 384         return frame_size;
 385 }
 386
 387 /*========================= End of Function ========================*/
 388
 389 /*------------------------------------------------------------------*/
 390 /*                                                                  */
 391 /* Name         - indent                                            */
 392 /*                                                                  */
 393 /* Function     - Perform nice indenting to current level           */
 394 /*                                                                  */
 395 /*------------------------------------------------------------------*/
 396
 397 static void
 398 indent (int diff) {
 399         int v;
 400         if (diff < 0)
 401                 indent_level += diff;
 402         v = indent_level;
 403         printf("[%3d] ",v);
 404         while (v-- > 0) {
 405                 printf (". ");
 406         }
 407         if (diff > 0)
 408                 indent_level += diff;
 409 }
 410
 411 /*========================= End of Function ========================*/
 412
 413 /*------------------------------------------------------------------*/
 414 /*                                                                  */
 415 /* Name         - decodeParm                                        */
 416 /*                                                                  */
 417 /* Function     - Decode a parameter for the trace.                 */
 418 /*                                                                  */
 419 /*------------------------------------------------------------------*/
 420
 421 static void
 422 decodeParm(MonoType *type, void *curParm, int size)
 423 {
 424         guint32 simpleType;
 425
 426         if (type->byref) {
 427                 printf("[BYREF:%p], ", *((char **) curParm));
 428         } else {
 429                 simpleType = type->type;
 430 enum_parmtype:
 431                 switch (simpleType) {
 432                         case MONO_TYPE_I :
 433                                 printf ("[INTPTR:%p], ", *((int **) curParm));
 434                                 break;
 435                         case MONO_TYPE_U :
 436                                 printf ("[UINTPTR:%p], ", *((int **) curParm));
 437                                 break;
 438                         case MONO_TYPE_BOOLEAN :
 439                                 printf ("[BOOL:%p], ", *((int *) curParm));
 440                                 break;
 441                         case MONO_TYPE_CHAR :
 442                                 printf ("[CHAR:%p], ", *((int *) curParm));
 443                                 break;
 444                         case MONO_TYPE_I1 :
 445                                 printf ("[INT1:%d], ", *((int *) curParm+3));
 446                                 break;
 447                         case MONO_TYPE_I2 :
 448                                 printf ("[INT2:%d], ", *((int *) curParm+2));
 449                                 break;
 450                         case MONO_TYPE_I4 :
 451                                 printf ("[INT4:%d], ", *((int *) curParm));
 452                                 break;
 453                         case MONO_TYPE_U1 :
 454                                 printf ("[UINT1:%ud], ", *((unsigned int *) curParm));
 455                                 break;
 456                         case MONO_TYPE_U2 :
 457                                 printf ("[UINT2:%ud], ", *((unsigned int *) curParm));
 458                                 break;
 459                         case MONO_TYPE_U4 :
 460                                 printf ("[UINT4:%ud], ", *((unsigned int *) curParm));
 461                                 break;
 462                         case MONO_TYPE_STRING : {
 463                                 MonoString *s = *((MonoString **) curParm);
 464                                 if (s) {
 465                                         g_assert (((MonoObject *) s)->vtable->klass == mono_defaults.string_class);
 466                                         printf("[STRING:%p:%s], ", s, mono_string_to_utf8(s));
 467                                 } else {
 468                                         printf("[STRING:null], ");
 469                                 }
 470                                 break;
 471                         }
 472                         case MONO_TYPE_CLASS :
 473                         case MONO_TYPE_OBJECT : {
 474                                 MonoObject *obj = *((MonoObject **) curParm);
 475                                 MonoClass *class;
 476                                 if (obj) {
 477                                         printf("[CLASS/OBJ:");
 478                                         class = obj->vtable->klass;
 479                                         if (class == mono_defaults.string_class) {
 480                                                 printf("[STRING:%p:%s]",
 481                                                        *obj, mono_string_to_utf8 (obj));
 482                                         } else if (class == mono_defaults.int32_class) {
 483                                                 printf("[INT32:%p:%d]",
 484                                                         obj, *(gint32 *)((char *)obj + sizeof (MonoObject)));
 485                                         } else
 486                                                 printf("[%s.%s:%p]",
 487                                                        class->name_space, class->name, obj);
 488                                         printf("], ");
 489                                 } else {
 490                                         printf("[OBJECT:null], ");
 491                                 }
 492                                 break;
 493                         }
 494                         case MONO_TYPE_PTR :
 495                                 printf("[PTR:%p], ", *((gpointer **) (curParm)));
 496                                 break;
 497                         case MONO_TYPE_FNPTR :
 498                                 printf("[FNPTR:%p], ", *((gpointer **) (curParm)));
 499                                 break;
 500                         case MONO_TYPE_ARRAY :
 501                                 printf("[ARRAY:%p], ", *((gpointer **) (curParm)));
 502                                 break;
 503                         case MONO_TYPE_SZARRAY :
 504                                 printf("[SZARRAY:%p], ", *((gpointer **) (curParm)));
 505                                 break;
 506                         case MONO_TYPE_I8 :
 507                                 printf("[INT8:%lld], ", *((gint64 *) (curParm)));
 508                                 break;
 509                         case MONO_TYPE_R4 :
 510                                 printf("[FLOAT4:%f], ", *((float *) (curParm)));
 511                                 break;
 512                         case MONO_TYPE_R8 :
 513                                 printf("[FLOAT8:%g], ", *((double *) (curParm)));
 514                                 break;
 515                         case MONO_TYPE_VALUETYPE : {
 516                                 int i;
 517                                 if (type->data.klass->enumtype) {
 518                                         simpleType = type->data.klass->enum_basetype->type;
 519                                         printf("{VALUETYPE} - ");
 520                                         goto enum_parmtype;
 521                                 }
 522                                 printf("[VALUETYPE:");
 523                                 for (i = 0; i < size; i++)
 524                                         printf("%02x,", *((guint8 *)curParm+i));
 525                                 printf("]");
 526                                 break;
 527                         }
 528                         default :
 529                                 printf("[?? - %d], ",simpleType);
 530                 }
 531         }
 532 }
 533
 534 /*========================= End of Function ========================*/
 535
 536 /*------------------------------------------------------------------*/
 537 /*                                                                  */
 538 /* Name         - enter_method                                      */
 539 /*                                                                  */
 540 /* Function     - Perform tracing of the entry to the current       */
 541 /*                method.                                           */
 542 /*                                                                  */
 543 /*------------------------------------------------------------------*/
 544
 545 static void
 546 enter_method (MonoMethod *method, RegParm *rParm, char *sp)
 547 {
 548         int i, oParm = 0, iParm = 0;
 549         MonoClass *class;
 550         MonoObject *obj;
 551         MonoJitArgumentInfo *arg_info;
 552         MonoMethodSignature *sig;
 553         char *fname;
 554         CallInfo *cinfo;
 555         ArgInfo *ainfo;
 556         size_data sz;
 557         void *curParm;
 558
 559         fname = mono_method_full_name (method, TRUE);
 560         indent (1);
 561         printf ("ENTER: %s(", fname);
 562         g_free (fname);
 563
 564         printf (") ip: %p sp: %p\n", __builtin_return_address (1), sp);
 565
 566         if (rParm == NULL)
 567                 return;
 568
 569         sig = method->signature;
 570
 571         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
 572
 573         if (cinfo->struct_ret) {
 574                 printf ("[VALUERET:%p], ", rParm->gr[0]);
 575                 iParm = 1;
 576         }
 577
 578         if (sig->hasthis) {
 579                 gpointer *this = (gpointer *) rParm->gr[iParm];
 580                 obj = (MonoObject *) this;
 581                 if (method->klass->valuetype) {
 582                         if (obj) {
 583                                 printf("this:[value:%p:%08x], ",
 584                                        this, *((guint32 *)(this+sizeof(MonoObject))));
 585                         } else
 586                                 printf ("this:[NULL], ");
 587                 } else {
 588                         if (obj) {
 589                                 class = obj->vtable->klass;
 590                                 if (class == mono_defaults.string_class) {
 591                                         printf ("this:[STRING:%p:%s], ",
 592                                                 obj, mono_string_to_utf8 ((MonoString *)obj));
 593                                 } else {
 594                                         printf ("this:%p[%s.%s], ",
 595                                                 obj, class->name_space, class->name);
 596                                 }
 597                         } else
 598                                 printf ("this:NULL, ");
 599                 }
 600                 oParm++;
 601         }
 602
 603         for (i = 0; i < sig->param_count; ++i) {
 604                 ainfo = cinfo->args + (i + oParm);
 605                 switch (ainfo->regtype) {
 606                         case RegTypeGeneral :
 607                                 decodeParm(sig->params[i], &(rParm->gr[ainfo->reg-2]), ainfo->size);
 608                                 break;
 609                         case RegTypeFP :
 610                                 decodeParm(sig->params[i], &(rParm->fp[ainfo->reg]), ainfo->size);
 611                                 break;
 612                         case RegTypeBase :
 613                                 decodeParm(sig->params[i], sp+ainfo->offset, ainfo->size);
 614                                 break;
 615                         case RegTypeStructByVal :
 616                                 if (ainfo->reg != STK_BASE)
 617                                         curParm = &(rParm->gr[ainfo->reg-2]);
 618                                 else
 619                                         curParm = sp+ainfo->offset;
 620
 621                                 switch (ainfo->vtsize) {
 622                                         case 0:
 623                                         case 1:
 624                                         case 2:
 625                                         case 4:
 626                                         case 8:
 627                                                 decodeParm(sig->params[i],
 628                                                    curParm,
 629                                                    ainfo->size);
 630                                                 break;
 631                                         default:
 632                                                 decodeParm(sig->params[i],
 633                                                    *((char **) curParm),
 634                                                    ainfo->vtsize);
 635                                         }
 636                                 break;
 637                         default :
 638                                 printf("???, ");
 639                 }
 640         }
 641         printf("\n");
 642         g_free(cinfo);
 643 }
 644
 645 /*========================= End of Function ========================*/
 646
 647 /*------------------------------------------------------------------*/
 648 /*                                                                  */
 649 /* Name         - leave_method                                      */
 650 /*                                                                  */
 651 /* Function     -                                                   */
 652 /*                                                                  */
 653 /*------------------------------------------------------------------*/
 654
 655 static void
 656 leave_method (MonoMethod *method, ...)
 657 {
 658         MonoType *type;
 659         char *fname;
 660         va_list ap;
 661
 662         va_start(ap, method);
 663
 664         fname = mono_method_full_name (method, TRUE);
 665         indent (-1);
 666         printf ("LEAVE: %s", fname);
 667         g_free (fname);
 668
 669         type = method->signature->ret;
 670
 671 handle_enum:
 672         switch (type->type) {
 673         case MONO_TYPE_VOID:
 674                 break;
 675         case MONO_TYPE_BOOLEAN: {
 676                 int val = va_arg (ap, int);
 677                 if (val)
 678                         printf ("[TRUE:%d]", val);
 679                 else
 680                         printf ("[FALSE]");
 681
 682                 break;
 683         }
 684         case MONO_TYPE_CHAR: {
 685                 int val = va_arg (ap, int);
 686                 printf ("[CHAR:%d]", val);
 687                 break;
 688         }
 689         case MONO_TYPE_I1: {
 690                 int val = va_arg (ap, int);
 691                 printf ("[INT1:%d]", val);
 692                 break;
 693         }
 694         case MONO_TYPE_U1: {
 695                 int val = va_arg (ap, int);
 696                 printf ("[UINT1:%d]", val);
 697                 break;
 698         }
 699         case MONO_TYPE_I2: {
 700                 int val = va_arg (ap, int);
 701                 printf ("[INT2:%d]", val);
 702                 break;
 703         }
 704         case MONO_TYPE_U2: {
 705                 int val = va_arg (ap, int);
 706                 printf ("[UINT2:%d]", val);
 707                 break;
 708         }
 709         case MONO_TYPE_I4: {
 710                 int val = va_arg (ap, int);
 711                 printf ("[INT4:%d]", val);
 712                 break;
 713         }
 714         case MONO_TYPE_U4: {
 715                 int val = va_arg (ap, int);
 716                 printf ("[UINT4:%d]", val);
 717                 break;
 718         }
 719         case MONO_TYPE_I: {
 720                 int *val = va_arg (ap, int*);
 721                 printf ("[INT:%p]", val);
 722                 printf("]");
 723                 break;
 724         }
 725         case MONO_TYPE_U: {
 726                 int *val = va_arg (ap, int*);
 727                 printf ("[UINT:%p]", val);
 728                 printf("]");
 729                 break;
 730         }
 731         case MONO_TYPE_STRING: {
 732                 MonoString *s = va_arg (ap, MonoString *);
 733 ;
 734                 if (s) {
 735                         g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
 736                         printf ("[STRING:%p:%s]", s, mono_string_to_utf8 (s));
 737                 } else
 738                         printf ("[STRING:null], ");
 739                 break;
 740         }
 741         case MONO_TYPE_CLASS:
 742         case MONO_TYPE_OBJECT: {
 743                 MonoObject *o = va_arg (ap, MonoObject *);
 744
 745                 if (o) {
 746                         if (o->vtable->klass == mono_defaults.boolean_class) {
 747                                 printf ("[BOOLEAN:%p:%d]", o, *((guint8 *)o + sizeof (MonoObject)));
 748                         } else if  (o->vtable->klass == mono_defaults.int32_class) {
 749                                 printf ("[INT32:%p:%d]", o, *((gint32 *)((char *)o + sizeof (MonoObject))));
 750                         } else if  (o->vtable->klass == mono_defaults.int64_class) {
 751                                 printf ("[INT64:%p:%lld]", o, *((gint64 *)((char *)o + sizeof (MonoObject))));
 752                         } else
 753                                 printf ("[%s.%s:%p]", o->vtable->klass->name_space, o->vtable->klass->name, o);
 754                 } else
 755                         printf ("[OBJECT:%p]", o);
 756
 757                 break;
 758         }
 759         case MONO_TYPE_PTR:
 760         case MONO_TYPE_FNPTR:
 761         case MONO_TYPE_ARRAY:
 762         case MONO_TYPE_SZARRAY: {
 763                 gpointer p = va_arg (ap, gpointer);
 764                 printf ("[result=%p]", p);
 765                 break;
 766         }
 767         case MONO_TYPE_I8: {
 768                 gint64 l =  va_arg (ap, gint64);
 769                 printf ("[LONG:%lld]", l);
 770                 break;
 771         }
 772         case MONO_TYPE_R8: {
 773                 double f = va_arg (ap, double);
 774                 printf ("[FP:%g]\n", f);
 775                 break;
 776         }
 777         case MONO_TYPE_VALUETYPE:
 778                 if (type->data.klass->enumtype) {
 779                         type = type->data.klass->enum_basetype;
 780                         goto handle_enum;
 781                 } else {
 782                         guint8 *p = va_arg (ap, gpointer);
 783                         int j, size, align;
 784                         size = mono_type_size (type, &align);
 785                         printf ("[");
 786                         for (j = 0; p && j < size; j++)
 787                                 printf ("%02x,", p [j]);
 788                         printf ("]");
 789                 }
 790                 break;
 791         default:
 792                 printf ("(unknown return type %x)", method->signature->ret->type);
 793         }
 794
 795         printf (" ip: %p\n", __builtin_return_address (0));
 796 }
 797
 798 /*========================= End of Function ========================*/
 799
 800 /*------------------------------------------------------------------*/
 801 /*                                                                  */
 802 /* Name         - mono_arch_cpu_init                                */
 803 /*                                                                  */
 804 /* Function     - Perform CPU specific initialization to execute    */
 805 /*                managed code.                                     */
 806 /*                                                                  */
 807 /*------------------------------------------------------------------*/
 808
 809 void
 810 mono_arch_cpu_init (void)
 811 {
 812 }
 813
 814 /*========================= End of Function ========================*/
 815
 816 /*------------------------------------------------------------------*/
 817 /*                                                                  */
 818 /* Name         - mono_arch_cpu_optimizazions                       */
 819 /*                                                                  */
 820 /* Function     - Returns the optimizations supported on this CPU   */
 821 /*                                                                  */
 822 /*------------------------------------------------------------------*/
 823
 824 guint32
 825 mono_arch_cpu_optimizazions (guint32 *exclude_mask)
 826 {
 827         guint32 opts = 0;
 828
 829         /* no s390-specific optimizations yet */
 830         *exclude_mask = MONO_OPT_INLINE|MONO_OPT_LINEARS;
 831         return opts;
 832 }
 833
 834 /*========================= End of Function ========================*/
 835
 836 /*------------------------------------------------------------------*/
 837 /*                                                                  */
 838 /* Name         -                                                   */
 839 /*                                                                  */
 840 /* Function     -                                                   */
 841 /*                                                                  */
 842 /*------------------------------------------------------------------*/
 843
 844 static gboolean
 845 is_regsize_var (MonoType *t) {
 846         if (t->byref)
 847                 return TRUE;
 848         switch (t->type) {
 849         case MONO_TYPE_I4:
 850         case MONO_TYPE_U4:
 851         case MONO_TYPE_I:
 852         case MONO_TYPE_U:
 853                 return TRUE;
 854         case MONO_TYPE_OBJECT:
 855         case MONO_TYPE_STRING:
 856         case MONO_TYPE_CLASS:
 857         case MONO_TYPE_SZARRAY:
 858         case MONO_TYPE_ARRAY:
 859                 return FALSE;
 860         case MONO_TYPE_VALUETYPE:
 861                 if (t->data.klass->enumtype)
 862                         return is_regsize_var (t->data.klass->enum_basetype);
 863                 return FALSE;
 864         }
 865         return FALSE;
 866 }
 867
 868 /*========================= End of Function ========================*/
 869
 870 /*------------------------------------------------------------------*/
 871 /*                                                                  */
 872 /* Name         - mono_arch_get_allocatable_int_vars                */
 873 /*                                                                  */
 874 /* Function     -                                                   */
 875 /*                                                                  */
 876 /*------------------------------------------------------------------*/
 877
 878 GList *
 879 mono_arch_get_allocatable_int_vars (MonoCompile *cfg)
 880 {
 881         GList *vars = NULL;
 882         int i;
 883
 884         for (i = 0; i < cfg->num_varinfo; i++) {
 885                 MonoInst *ins = cfg->varinfo [i];
 886                 MonoMethodVar *vmv = MONO_VARINFO (cfg, i);
 887
 888                 /* unused vars */
 889                 if (vmv->range.first_use.abs_pos > vmv->range.last_use.abs_pos)
 890                         continue;
 891
 892                 if (ins->flags & (MONO_INST_VOLATILE|MONO_INST_INDIRECT) || (ins->opcode != OP_LOCAL && ins->opcode != OP_ARG))
 893                         continue;
 894
 895                 /* we can only allocate 32 bit values */
 896                 if (is_regsize_var (ins->inst_vtype)) {
 897                         g_assert (MONO_VARINFO (cfg, i)->reg == -1);
 898                         g_assert (i == vmv->idx);
 899                         vars = mono_varlist_insert_sorted (cfg, vars, vmv, FALSE);
 900                 }
 901         }
 902
 903         return vars;
 904 }
 905
 906 /*========================= End of Function ========================*/
 907
 908 /*------------------------------------------------------------------*/
 909 /*                                                                  */
 910 /* Name         - mono_arch_global_int_regs                         */
 911 /*                                                                  */
 912 /* Function     - Return a list of usable integer registers.        */
 913 /*                                                                  */
 914 /*------------------------------------------------------------------*/
 915
 916 GList *
 917 mono_arch_get_global_int_regs (MonoCompile *cfg)
 918 {
 919         GList *regs = NULL;
 920         int i, top = 12;
 921
 922         for (i = 3; i < top; ++i)
 923                 regs = g_list_prepend (regs, GUINT_TO_POINTER (i));
 924
 925         return regs;
 926 }
 927
 928 /*========================= End of Function ========================*/
 929
 930 /*------------------------------------------------------------------*/
 931 /*                                                                  */
 932 /* Name         -  mono_arch_flush_icache                           */
 933 /*                                                                  */
 934 /* Function     -  Flush the CPU icache.                            */
 935 /*                                                                  */
 936 /*------------------------------------------------------------------*/
 937
 938 void
 939 mono_arch_flush_icache (guint8 *code, gint size)
 940 {
 941 }
 942
 943 /*========================= End of Function ========================*/
 944
 945 /*------------------------------------------------------------------*/
 946 /*                                                                  */
 947 /* Name         - add_general                                       */
 948 /*                                                                  */
 949 /* Function     - Determine code and stack size incremements for a  */
 950 /*                parameter.                                        */
 951 /*                                                                  */
 952 /*------------------------------------------------------------------*/
 953
 954 static void inline
 955 add_general (guint *gr, size_data *sz, ArgInfo *ainfo, gboolean simple)
 956 {
 957         if (simple) {
 958                 if (*gr > S390_LAST_ARG_REG) {
 959                         sz->stack_size  = S390_ALIGN(sz->stack_size, sizeof(long));
 960                         ainfo->offset   = sz->stack_size;
 961                         ainfo->reg      = STK_BASE;
 962                         ainfo->regtype  = RegTypeBase;
 963                         sz->stack_size += sizeof(int);
 964                         sz->code_size  += 12;
 965                 } else {
 966                         ainfo->reg      = *gr;
 967                         sz->code_size  += 8;
 968                 }
 969         } else {
 970                 if (*gr > S390_LAST_ARG_REG - 1) {
 971                         sz->stack_size  = S390_ALIGN(sz->stack_size, S390_STACK_ALIGNMENT);
 972                         ainfo->offset   = sz->stack_size;
 973                         ainfo->reg      = STK_BASE;
 974                         ainfo->regtype  = RegTypeBase;
 975                         sz->stack_size += sizeof(long long);
 976                         sz->code_size  += 10;
 977                 } else {
 978                         ainfo->reg      = *gr;
 979                         sz->code_size  += 8;
 980                 }
 981                 (*gr) ++;
 982         }
 983         (*gr) ++;
 984 }
 985
 986 /*========================= End of Function ========================*/
 987
 988 /*------------------------------------------------------------------*/
 989 /*                                                                  */
 990 /* Name         - calculate_sizes                                   */
 991 /*                                                                  */
 992 /* Function     - Determine the amount of space required for code   */
 993 /*                and stack. In addition determine starting points  */
 994 /*                for stack-based parameters, and area for struct-  */
 995 /*                ures being returned on the stack.                 */
 996 /*                                                                  */
 997 /*------------------------------------------------------------------*/
 998
 999 static CallInfo *
1000 calculate_sizes (MonoMethodSignature *sig, size_data *sz,
1001                  gboolean string_ctor)
1002 {
1003         guint i, fr, gr, size, nWords;
1004         int nParm = sig->hasthis + sig->param_count;
1005         guint32 simpletype, align;
1006         CallInfo *cinfo = g_malloc0 (sizeof (CallInfo) + sizeof (ArgInfo) * nParm);
1007
1008         fr                = 0;
1009         gr                = s390_r2;
1010         cinfo->struct_ret = 0;
1011         sz->retStruct     = 0;
1012         sz->stack_size    = S390_MINIMAL_STACK_SIZE;
1013         sz->code_size     = 0;
1014         sz->local_size    = 0;
1015
1016         nParm = 0;
1017         /*----------------------------------------------------------*/
1018         /* We determine the size of the return code/stack in case we*/
1019         /* need to reserve a register to be used to address a stack */
1020         /* area that the callee will use.                           */
1021         /*----------------------------------------------------------*/
1022
1023 //      if (sig->ret->byref || string_ctor) {
1024 //              sz->code_size += 8;
1025 //              add_general (&gr, sz, cinfo->args+nParm, TRUE);
1026 //              cinfo->args[nParm].size = sizeof(gpointer);
1027 //              nParm++;
1028 //      } else {
1029         {
1030                 simpletype = sig->ret->type;
1031 enum_retvalue:
1032                 switch (simpletype) {
1033                 case MONO_TYPE_BOOLEAN:
1034                 case MONO_TYPE_I1:
1035                 case MONO_TYPE_U1:
1036                 case MONO_TYPE_I2:
1037                 case MONO_TYPE_U2:
1038                 case MONO_TYPE_CHAR:
1039                 case MONO_TYPE_I4:
1040                 case MONO_TYPE_U4:
1041                 case MONO_TYPE_I:
1042                 case MONO_TYPE_U:
1043                 case MONO_TYPE_CLASS:
1044                 case MONO_TYPE_OBJECT:
1045                 case MONO_TYPE_SZARRAY:
1046                 case MONO_TYPE_ARRAY:
1047                 case MONO_TYPE_PTR:
1048                 case MONO_TYPE_STRING:
1049                         cinfo->ret.reg = s390_r2;
1050                         sz->code_size += 4;
1051                         break;
1052                 case MONO_TYPE_R4:
1053                 case MONO_TYPE_R8:
1054                         cinfo->ret.reg = s390_f0;
1055                         sz->code_size += 4;
1056                         break;
1057                 case MONO_TYPE_I8:
1058                 case MONO_TYPE_U8:
1059                         cinfo->ret.reg = s390_r2;
1060                         sz->code_size += 4;
1061                         break;
1062                 case MONO_TYPE_VALUETYPE:
1063                         if (sig->ret->data.klass->enumtype) {
1064                                 simpletype = sig->ret->data.klass->enum_basetype->type;
1065                                 goto enum_retvalue;
1066                         }
1067                         if (sig->pinvoke)
1068                                 size = mono_class_native_size (sig->ret->data.klass, &align);
1069                         else
1070                                 size = mono_class_value_size (sig->ret->data.klass, &align);
1071                         cinfo->ret.reg    = s390_r2;
1072                         cinfo->struct_ret = 1;
1073                         cinfo->ret.size   = size;
1074                         cinfo->ret.vtsize = size;
1075                         cinfo->ret.offset = sz->stack_size;
1076                         sz->stack_size   += S390_ALIGN(size, align);
1077                         gr++;
1078                         break;
1079                 case MONO_TYPE_VOID:
1080                         break;
1081                 default:
1082                         g_error ("Can't handle as return value 0x%x", sig->ret->type);
1083                 }
1084         }
1085
1086         if (sig->hasthis) {
1087                 add_general (&gr, sz, cinfo->args+nParm, TRUE);
1088                 cinfo->args[nParm].size = sizeof(gpointer);
1089                 nParm++;
1090         }
1091
1092         /*----------------------------------------------------------*/
1093         /* We determine the size of the parameter code and stack    */
1094         /* requirements by checking the types and sizes of the      */
1095         /* parameters.                                              */
1096         /*----------------------------------------------------------*/
1097
1098         for (i = 0; i < sig->param_count; ++i) {
1099                 if (sig->params [i]->byref) {
1100                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1101                         cinfo->args[nParm].size = sizeof(gpointer);
1102                         nParm++;
1103                         continue;
1104                 }
1105                 simpletype = sig->params [i]->type;
1106         enum_calc_size:
1107                 switch (simpletype) {
1108                 case MONO_TYPE_BOOLEAN:
1109                 case MONO_TYPE_I1:
1110                 case MONO_TYPE_U1:
1111                         cinfo->args[nParm].size = sizeof(char);
1112                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1113                         nParm++;
1114                         break;
1115                 case MONO_TYPE_I2:
1116                 case MONO_TYPE_U2:
1117                 case MONO_TYPE_CHAR:
1118                         cinfo->args[nParm].size = sizeof(short);
1119                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1120                         nParm++;
1121                         break;
1122                 case MONO_TYPE_I4:
1123                 case MONO_TYPE_U4:
1124                         cinfo->args[nParm].size = sizeof(int);
1125                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1126                         nParm++;
1127                         break;
1128                 case MONO_TYPE_I:
1129                 case MONO_TYPE_U:
1130                 case MONO_TYPE_PTR:
1131                 case MONO_TYPE_CLASS:
1132                 case MONO_TYPE_OBJECT:
1133                 case MONO_TYPE_STRING:
1134                 case MONO_TYPE_SZARRAY:
1135                 case MONO_TYPE_ARRAY:
1136                         cinfo->args[nParm].size = sizeof(gpointer);
1137                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1138                         nParm++;
1139                         break;
1140                 case MONO_TYPE_VALUETYPE:
1141                         if (sig->params [i]->data.klass->enumtype) {
1142                                 simpletype = sig->params [i]->data.klass->enum_basetype->type;
1143                                 goto enum_calc_size;
1144                         }
1145                         if (sig->pinvoke)
1146                                 size = mono_class_native_size (sig->params [i]->data.klass, &align);
1147                         else
1148                                 size = mono_class_value_size (sig->params [i]->data.klass, &align);
1149                         nWords = (size + sizeof(gpointer) - 1) /
1150                                  sizeof(gpointer);
1151
1152                         cinfo->args[nParm].vtsize  = 0;
1153                         cinfo->args[nParm].size    = 0;
1154                         cinfo->args[nParm].offparm = sz->local_size;
1155
1156                         switch (size) {
1157                                 /*----------------------------------*/
1158                                 /* On S/390, structures of size 1,  */
1159                                 /* 2, 4, and 8 bytes are passed in  */
1160                                 /* (a) register(s).                 */
1161                                 /*----------------------------------*/
1162                                 case 0:
1163                                 case 1:
1164                                 case 2:
1165                                 case 4:
1166                                         add_general(&gr, sz, cinfo->args+nParm, TRUE);
1167                                         cinfo->args[nParm].size    = sizeof(int);
1168                                         cinfo->args[nParm].regtype = RegTypeStructByVal;
1169                                         nParm++;
1170                                         sz->local_size += sizeof(long);
1171                                         break;
1172                                 case 8:
1173                                         add_general(&gr, sz, cinfo->args+nParm, FALSE);
1174                                         cinfo->args[nParm].size    = sizeof(long long);
1175                                         cinfo->args[nParm].regtype = RegTypeStructByVal;
1176                                         nParm++;
1177                                         sz->local_size += sizeof(long);
1178                                         break;
1179                                 default:
1180                                         add_general(&gr, sz, cinfo->args+nParm, TRUE);
1181                                         cinfo->args[nParm].size    = sizeof(int);
1182                                         cinfo->args[nParm].regtype = RegTypeStructByVal;
1183                                         cinfo->args[nParm].vtsize  = size;
1184                                         sz->code_size  += 40;
1185                                         sz->local_size += size;
1186                                         if (cinfo->args[nParm].reg == STK_BASE)
1187                                                 sz->local_size += sizeof(gpointer);
1188                                         nParm++;
1189                         }
1190                         break;
1191                 case MONO_TYPE_I8:
1192                 case MONO_TYPE_U8:
1193                         cinfo->args[nParm].size = sizeof(long long);
1194                         add_general (&gr, sz, cinfo->args+nParm, FALSE);
1195                         nParm++;
1196                         break;
1197                 case MONO_TYPE_R4:
1198                         cinfo->args[nParm].size = sizeof(float);
1199                         if (fr <= S390_LAST_FPARG_REG) {
1200                                 cinfo->args[nParm].regtype = RegTypeFP;
1201                                 cinfo->args[nParm].reg     = fr;
1202                                 sz->code_size += 4;
1203                                 fr += 2;
1204                         }
1205                         else {
1206                                 cinfo->args[nParm].offset  = sz->stack_size;
1207                                 cinfo->args[nParm].reg     = STK_BASE;
1208                                 cinfo->args[nParm].regtype = RegTypeBase;
1209                                 sz->code_size  += 4;
1210                                 sz->stack_size += sizeof(float);
1211                         }
1212                         nParm++;
1213                         break;
1214                 case MONO_TYPE_R8:
1215                         cinfo->args[nParm].size = sizeof(double);
1216                         if (fr <= S390_LAST_FPARG_REG) {
1217                                 cinfo->args[nParm].regtype = RegTypeFP;
1218                                 cinfo->args[nParm].reg     = fr;
1219                                 sz->code_size += 4;
1220                                 fr += 2;
1221                         } else {
1222                                 sz->stack_size  = S390_ALIGN(sz->stack_size,
1223                                                              S390_STACK_ALIGNMENT);
1224                                 cinfo->args[nParm].offset  = sz->stack_size;
1225                                 cinfo->args[nParm].reg     = STK_BASE;
1226                                 cinfo->args[nParm].regtype = RegTypeBase;
1227                                 sz->code_size  += 4;
1228                                 sz->stack_size += sizeof(double);
1229                         }
1230                         nParm++;
1231                         break;
1232                 default:
1233                         g_error ("Can't trampoline 0x%x", sig->params [i]->type);
1234                 }
1235         }
1236
1237
1238         /* align stack size */
1239         cinfo->stack_usage = S390_ALIGN(sz->stack_size+sz->local_size,
1240                                         S390_STACK_ALIGNMENT);
1241         return (cinfo);
1242 }
1243
1244 /*========================= End of Function ========================*/
1245
1246 /*------------------------------------------------------------------*/
1247 /*                                                                  */
1248 /* Name         - mono_arch_allocate_vars                           */
1249 /*                                                                  */
1250 /* Function     - Set var information according to the calling      */
1251 /*                convention for S/390. The local var stuff should  */
1252 /*                most likely be split in another method.           */
1253 /*                                                                  */
1254 /* Parameter    - @m - Compile unit.                                */
1255 /*                                                                  */
1256 /*------------------------------------------------------------------*/
1257
1258 void
1259 mono_arch_allocate_vars (MonoCompile *m)
1260 {
1261         MonoMethodSignature *sig;
1262         MonoMethodHeader *header;
1263         MonoInst *inst;
1264         CallInfo *cinfo;
1265         size_data sz;
1266         int iParm, iVar, offset, size, align, curinst;
1267         int frame_reg = STK_BASE;
1268         int sArg, eArg;
1269
1270         header  = ((MonoMethodNormal *)m->method)->header;
1271
1272         /*
1273          * We use the frame register also for any method that has
1274          * filter clauses. This way, when the handlers are called,
1275          * the code will reference local variables using the frame reg instead of
1276          * the stack pointer: if we had to restore the stack pointer, we'd
1277          * corrupt the method frames that are already on the stack (since
1278          * filters get called before stack unwinding happens) when the filter
1279          * code would call any method.
1280          */
1281 //      if ((m->flags & MONO_CFG_HAS_ALLOCA) || header->num_clauses)
1282         if (m->flags & MONO_CFG_HAS_ALLOCA)
1283                 frame_reg = s390_r11;
1284
1285         m->frame_reg = frame_reg;
1286
1287         if (frame_reg != STK_BASE)
1288                 m->used_int_regs |= 1 << frame_reg;
1289
1290         sig     = m->method->signature;
1291
1292         cinfo   = calculate_sizes (sig, &sz, sig->pinvoke);
1293
1294         if (cinfo->struct_ret) {
1295                 m->ret->opcode = OP_REGVAR;
1296                 m->ret->inst_c0 = s390_r2;
1297         } else {
1298                 /* FIXME: handle long and FP values */
1299                 switch (sig->ret->type) {
1300                 case MONO_TYPE_VOID:
1301                         break;
1302                 default:
1303                         m->ret->opcode = OP_REGVAR;
1304                         m->ret->dreg    = s390_r2;
1305                         break;
1306                 }
1307         }
1308
1309         /*--------------------------------------------------------------*/
1310         /* local vars are at a positive offset from the stack pointer   */
1311         /*                                                              */
1312         /* also note that if the function uses alloca, we use s390_r11  */
1313         /* to point at the local variables.                             */
1314         /* add parameter area size for called functions                 */
1315         /*--------------------------------------------------------------*/
1316         offset = (m->param_area + S390_MINIMAL_STACK_SIZE);
1317
1318         if (cinfo->struct_ret) {
1319                 inst               = m->ret;
1320                 offset             = S390_ALIGN(offset, sizeof(gpointer));
1321                 inst->inst_offset  = offset;
1322                 inst->opcode       = OP_REGOFFSET;
1323                 inst->inst_basereg = frame_reg;
1324                 offset            += sizeof(gpointer);
1325         }
1326
1327         if (sig->hasthis) {
1328                 inst = m->varinfo [0];
1329                 if (inst->opcode != OP_REGVAR) {
1330                         inst->opcode       = OP_REGOFFSET;
1331                         inst->inst_basereg = frame_reg;
1332                         offset             = S390_ALIGN(offset, sizeof(gpointer));
1333                         inst->inst_offset  = offset;
1334                         offset            += sizeof (gpointer);
1335                 }
1336                 curinst = sArg = 1;
1337         } else {
1338                 curinst = sArg = 0;
1339         }
1340
1341         eArg = sig->param_count + sArg;
1342
1343         for (iParm = sArg; iParm < eArg; ++iParm) {
1344                 inst = m->varinfo [curinst];
1345                 if (inst->opcode != OP_REGVAR) {
1346                         if (cinfo->args[iParm].regtype == RegTypeStructByVal) {
1347                                 if (cinfo->args[iParm].vtsize != 0) {
1348                                         inst->opcode       = OP_S390_LOADARG;
1349                                         inst->inst_basereg = frame_reg;
1350                                         size               = sizeof(long);
1351                                         offset             = S390_ALIGN(offset, size);
1352                                         inst->inst_offset  = offset;
1353                                 } else {
1354                                         inst->opcode       = OP_S390_ARGPTR;
1355                                         inst->inst_basereg = frame_reg;
1356                                         size               = cinfo->args[iParm].size;
1357                                         offset             = S390_ALIGN(offset, size);
1358                                         inst->inst_offset  = offset;
1359                                 }
1360                         } else {
1361                                 if (cinfo->args[iParm].reg != STK_BASE) {
1362                                         inst->opcode       = OP_REGOFFSET;
1363                                         inst->inst_basereg = frame_reg;
1364                                         size               = (cinfo->args[iParm].size < 8
1365                                                               ? sizeof(long)
1366                                                               : sizeof(long long));
1367                                         offset             = S390_ALIGN(offset, size);
1368                                         inst->inst_offset  = offset;
1369                                 } else {
1370                                         inst->opcode       = OP_S390_STKARG;
1371                                         inst->inst_basereg = frame_reg;
1372                                         size               = (cinfo->args[iParm].size < 4
1373                                                               ? 4 - cinfo->args[iParm].size
1374                                                               : 0);
1375                                         inst->inst_offset  = cinfo->args[iParm].offset +
1376                                                              size;
1377 //                                      inst->unused       = stackOffset;
1378                                         inst->unused       = 0;
1379                                         size               = sizeof(long);
1380                                 }
1381                         }
1382                         offset += size;
1383                 }
1384                 curinst++;
1385         }
1386
1387         curinst = m->locals_start;
1388         for (iVar = curinst; iVar < m->num_varinfo; ++iVar) {
1389                 inst = m->varinfo [iVar];
1390                 if (inst->opcode == OP_REGVAR)
1391                         continue;
1392
1393                 /* inst->unused indicates native sized value types, this is used by the
1394                 * pinvoke wrappers when they call functions returning structure */
1395                 if (inst->unused && MONO_TYPE_ISSTRUCT (inst->inst_vtype))
1396                         size = mono_class_native_size (inst->inst_vtype->data.klass, &align);
1397                 else
1398                         size = mono_type_size (inst->inst_vtype, &align);
1399
1400                 offset             = S390_ALIGN(offset, align);
1401                 inst->inst_offset  = offset;
1402                 inst->opcode       = OP_REGOFFSET;
1403                 inst->inst_basereg = frame_reg;
1404                 offset            += size;
1405                 //DEBUG (g_print("allocating local %d to %d\n", iVar, inst->inst_offset));
1406         }
1407
1408 //      if (sig->hasthis)
1409 //              curinst = sArg = 1;
1410 //      else
1411 //              curinst = sArg = 0;
1412 //
1413
1414         /*------------------------------------------------------*/
1415         /* Allow space for the trace method stack area if needed*/
1416         /*------------------------------------------------------*/
1417         if (mono_jit_trace_calls != NULL && mono_trace_eval (m))
1418                 offset += S390_TRACE_STACK_SIZE;
1419
1420         /*------------------------------------------------------*/
1421         /* Reserve space to save LMF and caller saved registers */
1422         /*------------------------------------------------------*/
1423         if (m->method->save_lmf)
1424                 offset += sizeof (MonoLMF);
1425
1426         /*------------------------------------------------------*/
1427         /* align the offset                                     */
1428         /*------------------------------------------------------*/
1429         m->stack_offset = S390_ALIGN(offset, S390_STACK_ALIGNMENT);
1430
1431 }
1432
1433 /*========================= End of Function ========================*/
1434
1435 /*------------------------------------------------------------------*/
1436 /*                                                                  */
1437 /* Name         - mono_arch_call_opcode                             */
1438 /*                                                                  */
1439 /* Function     - Take the arguments and generate the arch-specific */
1440 /*                instructions to properly call the function. This  */
1441 /*                includes pushing, moving argments to the correct  */
1442 /*                etc.                                              */
1443 /*                                                                  */
1444 /* Note         - FIXME: We need an alignment solution for          */
1445 /*                enter_method and mono_arch_call_opcode, currently */
1446 /*                alignment in mono_arch_call_opcode is computed    */
1447 /*                without arch_get_argument_info.                   */
1448 /*                                                                  */
1449 /*------------------------------------------------------------------*/
1450
1451 MonoCallInst*
1452 mono_arch_call_opcode (MonoCompile *cfg, MonoBasicBlock* bb, MonoCallInst *call, int is_virtual) {
1453         MonoInst *arg, *in;
1454         MonoMethodSignature *sig;
1455         int i, n, lParamArea;
1456         CallInfo *cinfo;
1457         ArgInfo *ainfo;
1458         size_data sz;
1459
1460         sig = call->signature;
1461         n = sig->param_count + sig->hasthis;
1462         DEBUG (g_print ("Call requires: %d parameters\n",n));
1463
1464         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
1465
1466         call->stack_usage = cinfo->stack_usage;
1467         lParamArea        = cinfo->stack_usage - S390_MINIMAL_STACK_SIZE;
1468         cfg->param_area   = MAX (cfg->param_area, lParamArea);
1469         cfg->flags       |= MONO_CFG_HAS_CALLS;
1470         /*----------------------------------------------------------*/
1471         /* should set more info in call, such as the stack space    */
1472         /* used by the args that needs to be added back to esp      */
1473         /*----------------------------------------------------------*/
1474
1475         if (cinfo->struct_ret)
1476                 call->used_iregs |= 1 << cinfo->struct_ret;
1477
1478         for (i = 0; i < n; ++i) {
1479                 ainfo = cinfo->args + i;
1480                 DEBUG (g_print ("Parameter %d - Register: %d Type: %d\n",
1481                                 i+1,ainfo->reg,ainfo->regtype));
1482                 if (is_virtual && i == 0) {
1483                         /* the argument will be attached to the call instrucion */
1484                         in = call->args [i];
1485                         call->used_iregs |= 1 << ainfo->reg;
1486                 } else {
1487                         MONO_INST_NEW (cfg, arg, OP_OUTARG);
1488                         in = call->args [i];
1489                         arg->cil_code  = in->cil_code;
1490                         arg->inst_left = in;
1491                         arg->type      = in->type;
1492                         /* prepend, we'll need to reverse them later */
1493                         arg->next      = call->out_args;
1494                         call->out_args = arg;
1495                         if (ainfo->regtype == RegTypeGeneral) {
1496                                 arg->unused = ainfo->reg;
1497                                 call->used_iregs |= 1 << ainfo->reg;
1498                                 if (arg->type == STACK_I8)
1499                                         call->used_iregs |= 1 << (ainfo->reg + 1);
1500                         } else if (ainfo->regtype == RegTypeStructByAddr) {
1501                                 arg->unused = ainfo->reg;
1502                                 call->used_iregs |= 1 << ainfo->reg;
1503                         } else if (ainfo->regtype == RegTypeStructByVal) {
1504                                 if (ainfo->reg != STK_BASE) {
1505                                         switch (ainfo->size) {
1506                                         case 0:
1507                                         case 1:
1508                                         case 2:
1509                                         case 4:
1510                                                 call->used_iregs |= 1 << ainfo->reg;
1511                                                 break;
1512                                         case 8:
1513                                                 call->used_iregs |= 1 << ainfo->reg;
1514                                                 call->used_iregs |= 1 << (ainfo->reg+1);
1515                                                 break;
1516                                         default:
1517                                                 call->used_iregs |= 1 << ainfo->reg;
1518                                         }
1519                                 }
1520                                 arg->sreg1    = ainfo->reg;
1521                                 arg->opcode   = OP_OUTARG_VT;
1522                                 if (ainfo->vtsize != 0)
1523                                         arg->unused = -ainfo->vtsize;
1524                                 else
1525                                         arg->unused = ainfo->size;
1526                                 arg->inst_imm  = ainfo->offset;
1527                                 arg->sreg2     = ainfo->offparm + S390_MINIMAL_STACK_SIZE;
1528                         } else if (ainfo->regtype == RegTypeBase) {
1529                                 arg->opcode = OP_OUTARG;
1530                                 arg->unused = ainfo->reg | (ainfo->size << 8);
1531                                 arg->inst_imm = ainfo->offset;
1532                                 call->used_fregs |= 1 << ainfo->reg;
1533                         } else if (ainfo->regtype == RegTypeFP) {
1534                                 arg->opcode = OP_OUTARG_R8;
1535                                 arg->unused = ainfo->reg;
1536                                 call->used_fregs |= 1 << ainfo->reg;
1537                                 if (ainfo->size == 4) {
1538                                         /* we reduce the precision */
1539                                         MonoInst *conv;
1540                                         MONO_INST_NEW (cfg, conv, OP_FCONV_TO_R4);
1541                                         conv->inst_left = arg->inst_left;
1542                                         arg->inst_left = conv;
1543                                 }
1544                         } else {
1545                                 g_assert_not_reached ();
1546                         }
1547                 }
1548         }
1549         /*
1550          * Reverse the call->out_args list.
1551          */
1552         {
1553                 MonoInst *prev = NULL, *list = call->out_args, *next;
1554                 while (list) {
1555                         next = list->next;
1556                         list->next = prev;
1557                         prev = list;
1558                         list = next;
1559                 }
1560                 call->out_args = prev;
1561         }
1562
1563         g_free (cinfo);
1564         return call;
1565 }
1566
1567 /*========================= End of Function ========================*/
1568
1569 /*------------------------------------------------------------------*/
1570 /*                                                                  */
1571 /* Name         - mono_arch_instrument_mem_needs                    */
1572 /*                                                                  */
1573 /* Function     - Allow tracing to work with this interface (with   */
1574 /*                an optional argument).                            */
1575 /*                                                                  */
1576 /*------------------------------------------------------------------*/
1577
1578 void
1579 mono_arch_instrument_mem_needs (MonoMethod *method, int *stack, int *code)
1580 {
1581         /* no stack room needed now (may be needed for FASTCALL-trace support) */
1582         *stack = 0;
1583         /* split prolog-epilog requirements? */
1584         *code = 50; /* max bytes needed: check this number */
1585 }
1586
1587 /*========================= End of Function ========================*/
1588
1589 /*------------------------------------------------------------------*/
1590 /*                                                                  */
1591 /* Name         - mono_arch_instrument_prolog                       */
1592 /*                                                                  */
1593 /* Function     - Create an "instrumented" prolog.                  */
1594 /*                                                                  */
1595 /*------------------------------------------------------------------*/
1596
1597 void*
1598 mono_arch_instrument_prolog (MonoCompile *cfg, void *func, void *p,
1599                              gboolean enable_arguments)
1600 {
1601         guchar *code = p;
1602         int     parmOffset,
1603                 fpOffset;
1604
1605         parmOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1606         if (cfg->method->save_lmf)
1607                 parmOffset -= sizeof(MonoLMF);
1608         fpOffset   = parmOffset + (5*sizeof(gint32));
1609
1610         s390_stm  (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1611         s390_std  (code, s390_f0, 0, STK_BASE, fpOffset);
1612         s390_std  (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1613         s390_std  (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1614         s390_basr (code, s390_r13, 0);
1615         s390_j    (code, 6);
1616         s390_word (code, cfg->method);
1617         s390_word (code, func);
1618         s390_l    (code, s390_r2, 0, s390_r13, 4);
1619         s390_la   (code, s390_r3, 0, STK_BASE, parmOffset);
1620         s390_lr   (code, s390_r4, STK_BASE);
1621         s390_ahi  (code, s390_r4, cfg->stack_usage);
1622         s390_l    (code, s390_r1, 0, s390_r13, 8);
1623         s390_basr (code, s390_r14, s390_r1);
1624         s390_ld   (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1625         s390_ld   (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1626         s390_ld   (code, s390_f0, 0, STK_BASE, fpOffset);
1627         s390_lm   (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1628
1629         return code;
1630 }
1631
1632 /*========================= End of Function ========================*/
1633
1634 /*------------------------------------------------------------------*/
1635 /*                                                                  */
1636 /* Name         - mono_arch_instrument_epilog                       */
1637 /*                                                                  */
1638 /* Function     - Create an epilog that will handle the returned    */
1639 /*                values used in instrumentation.                   */
1640 /*                                                                  */
1641 /*------------------------------------------------------------------*/
1642
1643 void*
1644 mono_arch_instrument_epilog (MonoCompile *cfg, void *func, void *p, gboolean enable_arguments)
1645 {
1646         guchar     *code = p;
1647         int        save_mode = SAVE_NONE,
1648                    saveOffset;
1649         MonoMethod *method = cfg->method;
1650         int        rtype = method->signature->ret->type;
1651
1652         saveOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1653         if (method->save_lmf)
1654                 saveOffset -= sizeof(MonoLMF);
1655
1656 handle_enum:
1657         switch (rtype) {
1658         case MONO_TYPE_VOID:
1659                 /* special case string .ctor icall */
1660                 if (strcmp (".ctor", method->name) && method->klass == mono_defaults.string_class)
1661                         save_mode = SAVE_ONE;
1662                 else
1663                         save_mode = SAVE_NONE;
1664                 break;
1665         case MONO_TYPE_I8:
1666         case MONO_TYPE_U8:
1667                 save_mode = SAVE_TWO;
1668                 break;
1669         case MONO_TYPE_R4:
1670         case MONO_TYPE_R8:
1671                 save_mode = SAVE_FP;
1672                 break;
1673         case MONO_TYPE_VALUETYPE:
1674                 if (method->signature->ret->data.klass->enumtype) {
1675                         rtype = method->signature->ret->data.klass->enum_basetype->type;
1676                         goto handle_enum;
1677                 }
1678                 save_mode = SAVE_STRUCT;
1679                 break;
1680         default:
1681                 save_mode = SAVE_ONE;
1682                 break;
1683         }
1684
1685         switch (save_mode) {
1686         case SAVE_TWO:
1687                 s390_stm (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1688                 if (enable_arguments) {
1689                         s390_lr (code, s390_r4, s390_r3);
1690                         s390_lr (code, s390_r3, s390_r2);
1691                 }
1692                 break;
1693         case SAVE_ONE:
1694                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1695                 if (enable_arguments) {
1696                         s390_lr (code, s390_r3, s390_r2);
1697                 }
1698                 break;
1699         case SAVE_FP:
1700                 s390_std (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1701                 if (enable_arguments) {
1702                         /* FIXME: what reg?  */
1703                         s390_ldr (code, s390_f2, s390_f0);
1704                         s390_lm  (code, s390_r3, s390_r4, cfg->frame_reg, saveOffset);
1705                 }
1706                 break;
1707         case SAVE_STRUCT:
1708                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1709                 if (enable_arguments) {
1710                         s390_l (code, s390_r3, 0, cfg->frame_reg,
1711                                 S390_MINIMAL_STACK_SIZE+cfg->param_area);
1712                 }
1713                 break;
1714         case SAVE_NONE:
1715         default:
1716                 break;
1717         }
1718
1719         s390_basr (code, s390_r13, 0);
1720         s390_j    (code, 6);
1721         s390_word (code, cfg->method);
1722         s390_word (code, func);
1723         s390_l    (code, s390_r2, 0, s390_r13, 4);
1724         s390_l    (code, s390_r1, 0, s390_r13, 8);
1725         s390_basr (code, s390_r14, s390_r1);
1726
1727         switch (save_mode) {
1728         case SAVE_TWO:
1729                 s390_lm  (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1730                 break;
1731         case SAVE_ONE:
1732                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1733                 break;
1734         case SAVE_FP:
1735                 s390_ld  (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1736                 break;
1737         case SAVE_STRUCT:
1738                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1739                 break;
1740         case SAVE_NONE:
1741         default:
1742                 break;
1743         }
1744
1745         return code;
1746 }
1747
1748 /*========================= End of Function ========================*/
1749
1750 /*------------------------------------------------------------------*/
1751 /*                                                                  */
1752 /* Name         - peephole_pass                                     */
1753 /*                                                                  */
1754 /* Function     - Form a peephole pass at the code looking for      */
1755 /*                simple optimizations.                             */
1756 /*                                                                  */
1757 /*------------------------------------------------------------------*/
1758
1759 static void
1760 peephole_pass (MonoCompile *cfg, MonoBasicBlock *bb)
1761 {
1762         MonoInst *ins, *last_ins = NULL;
1763         ins = bb->code;
1764
1765         while (ins) {
1766
1767                 switch (ins->opcode) {
1768                 case OP_MUL_IMM:
1769                         /* remove unnecessary multiplication with 1 */
1770                         if (ins->inst_imm == 1) {
1771                                 if (ins->dreg != ins->sreg1) {
1772                                         ins->opcode = OP_MOVE;
1773                                 } else {
1774                                         last_ins->next = ins->next;
1775                                         ins = ins->next;
1776                                         continue;
1777                                 }
1778                         }
1779                         break;
1780                 case OP_LOAD_MEMBASE:
1781                 case OP_LOADI4_MEMBASE:
1782                         /*
1783                          * OP_STORE_MEMBASE_REG reg, offset(basereg)
1784                          * OP_LOAD_MEMBASE offset(basereg), reg
1785                          */
1786                         if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_REG
1787                                          || last_ins->opcode == OP_STORE_MEMBASE_REG) &&
1788                             ins->inst_basereg == last_ins->inst_destbasereg &&
1789                             ins->inst_offset == last_ins->inst_offset) {
1790                                 if (ins->dreg == last_ins->sreg1) {
1791                                         last_ins->next = ins->next;
1792                                         ins = ins->next;
1793                                         continue;
1794                                 } else {
1795                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1796                                         ins->opcode = OP_MOVE;
1797                                         ins->sreg1 = last_ins->sreg1;
1798                                 }
1799
1800                         /*
1801                          * Note: reg1 must be different from the basereg in the second load
1802                          * OP_LOAD_MEMBASE offset(basereg), reg1
1803                          * OP_LOAD_MEMBASE offset(basereg), reg2
1804                          * -->
1805                          * OP_LOAD_MEMBASE offset(basereg), reg1
1806                          * OP_MOVE reg1, reg2
1807                          */
1808                         } if (last_ins && (last_ins->opcode == OP_LOADI4_MEMBASE
1809                                            || last_ins->opcode == OP_LOAD_MEMBASE) &&
1810                               ins->inst_basereg != last_ins->dreg &&
1811                               ins->inst_basereg == last_ins->inst_basereg &&
1812                               ins->inst_offset == last_ins->inst_offset) {
1813
1814                                 if (ins->dreg == last_ins->dreg) {
1815                                         last_ins->next = ins->next;
1816                                         ins = ins->next;
1817                                         continue;
1818                                 } else {
1819                                         ins->opcode = OP_MOVE;
1820                                         ins->sreg1 = last_ins->dreg;
1821                                 }
1822
1823                                 //g_assert_not_reached ();
1824
1825 #if 0
1826                         /*
1827                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1828                          * OP_LOAD_MEMBASE offset(basereg), reg
1829                          * -->
1830                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1831                          * OP_ICONST reg, imm
1832                          */
1833                         } else if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_IMM
1834                                                 || last_ins->opcode == OP_STORE_MEMBASE_IMM) &&
1835                                    ins->inst_basereg == last_ins->inst_destbasereg &&
1836                                    ins->inst_offset == last_ins->inst_offset) {
1837                                 //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1838                                 ins->opcode = OP_ICONST;
1839                                 ins->inst_c0 = last_ins->inst_imm;
1840                                 g_assert_not_reached (); // check this rule
1841 #endif
1842                         }
1843                         break;
1844                 case OP_LOADU1_MEMBASE:
1845                 case OP_LOADI1_MEMBASE:
1846                         if (last_ins && (last_ins->opcode == OP_STOREI1_MEMBASE_REG) &&
1847                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1848                                         ins->inst_offset == last_ins->inst_offset) {
1849                                 if (ins->dreg == last_ins->sreg1) {
1850                                         last_ins->next = ins->next;
1851                                         ins = ins->next;
1852                                         continue;
1853                                 } else {
1854                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1855                                         ins->opcode = OP_MOVE;
1856                                         ins->sreg1 = last_ins->sreg1;
1857                                 }
1858                         }
1859                         break;
1860                 case OP_LOADU2_MEMBASE:
1861                 case OP_LOADI2_MEMBASE:
1862                         if (last_ins && (last_ins->opcode == OP_STOREI2_MEMBASE_REG) &&
1863                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1864                                         ins->inst_offset == last_ins->inst_offset) {
1865                                 if (ins->dreg == last_ins->sreg1) {
1866                                         last_ins->next = ins->next;
1867                                         ins = ins->next;
1868                                         continue;
1869                                 } else {
1870                                         ins->opcode = OP_MOVE;
1871                                         ins->sreg1 = last_ins->sreg1;
1872                                 }
1873                         }
1874                         break;
1875                 case CEE_CONV_I4:
1876                 case CEE_CONV_U4:
1877                 case OP_MOVE:
1878                         /*
1879                          * OP_MOVE reg, reg
1880                          */
1881                         if (ins->dreg == ins->sreg1) {
1882                                 if (last_ins)
1883                                         last_ins->next = ins->next;
1884                                 ins = ins->next;
1885                                 continue;
1886                         }
1887                         /*
1888                          * OP_MOVE sreg, dreg
1889                          * OP_MOVE dreg, sreg
1890                          */
1891                         if (last_ins && last_ins->opcode == OP_MOVE &&
1892                             ins->sreg1 == last_ins->dreg &&
1893                             ins->dreg == last_ins->sreg1) {
1894                                 last_ins->next = ins->next;
1895                                 ins = ins->next;
1896                                 continue;
1897                         }
1898                         break;
1899                 }
1900                 last_ins = ins;
1901                 ins = ins->next;
1902         }
1903         bb->last_ins = last_ins;
1904 }
1905
1906 /*========================= End of Function ========================*/
1907
1908 /*------------------------------------------------------------------*/
1909 /*                                                                  */
1910 /* Name         - mono_spillvar_offset                              */
1911 /*                                                                  */
1912 /* Function     - Returns the offset used by spillvar. It allocates */
1913 /*                a new spill variable if necessary.                */
1914 /*                                                                  */
1915 /*------------------------------------------------------------------*/
1916
1917 static int
1918 mono_spillvar_offset (MonoCompile *cfg, int spillvar)
1919 {
1920         MonoSpillInfo **si, *info;
1921         int i = 0;
1922
1923         si = &cfg->spill_info;
1924
1925         while (i <= spillvar) {
1926
1927                 if (!*si) {
1928                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1929                         info->next = NULL;
1930                         info->offset = cfg->stack_offset;
1931                         cfg->stack_offset += sizeof (gpointer);
1932                 }
1933
1934                 if (i == spillvar)
1935                         return (*si)->offset;
1936
1937                 i++;
1938                 si = &(*si)->next;
1939         }
1940
1941         g_assert_not_reached ();
1942         return 0;
1943 }
1944
1945 /*========================= End of Function ========================*/
1946
1947 /*------------------------------------------------------------------*/
1948 /*                                                                  */
1949 /* Name         - mono_spillvar_offset_float                        */
1950 /*                                                                  */
1951 /* Function     -                                                   */
1952 /*                                                                  */
1953 /*------------------------------------------------------------------*/
1954
1955 static int
1956 mono_spillvar_offset_float (MonoCompile *cfg, int spillvar)
1957 {
1958         MonoSpillInfo **si, *info;
1959         int i = 0;
1960
1961         si = &cfg->spill_info_float;
1962
1963         while (i <= spillvar) {
1964
1965                 if (!*si) {
1966                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1967                         info->next         = NULL;
1968                         cfg->stack_offset  = S390_ALIGN(cfg->stack_offset, S390_STACK_ALIGNMENT);
1969                         info->offset       = cfg->stack_offset;
1970                         cfg->stack_offset += sizeof (double);
1971                 }
1972
1973                 if (i == spillvar)
1974                         return (*si)->offset;
1975
1976                 i++;
1977                 si = &(*si)->next;
1978         }
1979
1980         g_assert_not_reached ();
1981         return 0;
1982 }
1983
1984 /*========================= End of Function ========================*/
1985
1986 /*------------------------------------------------------------------*/
1987 /*                                                                  */
1988 /* Name         - print_ins                                         */
1989 /*                                                                  */
1990 /* Function     - Decode and print the instruction for tracing.     */
1991 /*                                                                  */
1992 /*------------------------------------------------------------------*/
1993
1994 static void
1995 print_ins (int i, MonoInst *ins)
1996 {
1997         const char *spec = ins_spec [ins->opcode];
1998         g_print ("\t%-2d %s", i, mono_inst_name (ins->opcode));
1999         if (spec [MONO_INST_DEST]) {
2000                 if (ins->dreg >= MONO_MAX_IREGS)
2001                         g_print (" R%d <-", ins->dreg);
2002                 else
2003                         g_print (" %s <-", mono_arch_regname (ins->dreg));
2004         }
2005         if (spec [MONO_INST_SRC1]) {
2006                 if (ins->sreg1 >= MONO_MAX_IREGS)
2007                         g_print (" R%d", ins->sreg1);
2008                 else
2009                         g_print (" %s", mono_arch_regname (ins->sreg1));
2010         }
2011         if (spec [MONO_INST_SRC2]) {
2012                 if (ins->sreg2 >= MONO_MAX_IREGS)
2013                         g_print (" R%d", ins->sreg2);
2014                 else
2015                         g_print (" %s", mono_arch_regname (ins->sreg2));
2016         }
2017         if (spec [MONO_INST_CLOB])
2018                 g_print (" clobbers: %c", spec [MONO_INST_CLOB]);
2019         g_print ("\n");
2020 }
2021
2022 /*========================= End of Function ========================*/
2023
2024 /*------------------------------------------------------------------*/
2025 /*                                                                  */
2026 /* Name         - print_regtrack.                                   */
2027 /*                                                                  */
2028 /* Function     -                                                   */
2029 /*                                                                  */
2030 /*------------------------------------------------------------------*/
2031
2032 static void
2033 print_regtrack (RegTrack *t, int num)
2034 {
2035         int i;
2036         char buf [32];
2037         const char *r;
2038
2039         for (i = 0; i < num; ++i) {
2040                 if (!t [i].born_in)
2041                         continue;
2042                 if (i >= MONO_MAX_IREGS) {
2043                         g_snprintf (buf, sizeof(buf), "R%d", i);
2044                         r = buf;
2045                 } else
2046                         r = mono_arch_regname (i);
2047                 g_print ("liveness: %s [%d - %d]\n", r, t [i].born_in, t[i].last_use);
2048         }
2049 }
2050
2051 /*========================= End of Function ========================*/
2052
2053 /*------------------------------------------------------------------*/
2054 /*                                                                  */
2055 /* Name         - inst_list_prepend                                 */
2056 /*                                                                  */
2057 /* Function     - Prepend an instruction to the list.               */
2058 /*                                                                  */
2059 /*------------------------------------------------------------------*/
2060
2061 static inline InstList*
2062 inst_list_prepend (MonoMemPool *pool, InstList *list, MonoInst *data)
2063 {
2064         InstList *item = mono_mempool_alloc (pool, sizeof (InstList));
2065         item->data = data;
2066         item->prev = NULL;
2067         item->next = list;
2068         if (list)
2069                 list->prev = item;
2070         return item;
2071 }
2072
2073 /*========================= End of Function ========================*/
2074
2075 /*------------------------------------------------------------------*/
2076 /*                                                                  */
2077 /* Name         - get_register_force_spilling                       */
2078 /*                                                                  */
2079 /* Function     - Force the spilling of the variable in the         */
2080 /*                symbolic register 'reg'.                          */
2081 /*                                                                  */
2082 /*------------------------------------------------------------------*/
2083
2084 static int
2085 get_register_force_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, int reg)
2086 {
2087         MonoInst *load;
2088         int i, sel, spill;
2089
2090         sel = cfg->rs->iassign [reg];
2091         i = reg;
2092         spill = ++cfg->spill_count;
2093         cfg->rs->iassign [i] = -spill - 1;
2094         mono_regstate_free_int (cfg->rs, sel);
2095         /*----------------------------------------------------------*/
2096         /* we need to create a spill var and insert a load to sel   */
2097         /* after the current instruction                            */
2098         /*----------------------------------------------------------*/
2099         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2100         load->dreg = sel;
2101         load->inst_basereg = cfg->frame_reg;
2102         load->inst_offset = mono_spillvar_offset (cfg, spill);
2103         if (item->prev) {
2104                 while (ins->next != item->prev->data)
2105                         ins = ins->next;
2106         }
2107         load->next = ins->next;
2108         ins->next  = load;
2109         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n",
2110                         spill, load->inst_offset, i, mono_arch_regname (sel)));
2111         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2112         g_assert (i == sel);
2113
2114         return sel;
2115 }
2116
2117 /*========================= End of Function ========================*/
2118
2119 /*------------------------------------------------------------------*/
2120 /*                                                                  */
2121 /* Name         -  get_register_spilling                            */
2122 /*                                                                  */
2123 /* Function     -                                                   */
2124 /*                                                                  */
2125 /*------------------------------------------------------------------*/
2126
2127 static int
2128 get_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2129 {
2130         MonoInst *load;
2131         int i, sel, spill;
2132
2133         DEBUG (g_print ("start regmask to assign R%d: 0x%08x (R%d <- R%d R%d)\n", reg, regmask, ins->dreg, ins->sreg1, ins->sreg2));
2134         /* exclude the registers in the current instruction */
2135         if (reg != ins->sreg1 &&
2136             (reg_is_freeable (ins->sreg1) ||
2137              (ins->sreg1 >= MONO_MAX_IREGS &&
2138               cfg->rs->iassign [ins->sreg1] >= 0))) {
2139                 if (ins->sreg1 >= MONO_MAX_IREGS)
2140                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg1]);
2141                 else
2142                         regmask &= ~ (1 << ins->sreg1);
2143                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2144         }
2145         if (reg != ins->sreg2 &&
2146             (reg_is_freeable (ins->sreg2) ||
2147              (ins->sreg2 >= MONO_MAX_IREGS &&
2148               cfg->rs->iassign [ins->sreg2] >= 0))) {
2149                 if (ins->sreg2 >= MONO_MAX_IREGS)
2150                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg2]);
2151                 else
2152                         regmask &= ~ (1 << ins->sreg2);
2153                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2154         }
2155         if (reg != ins->dreg && reg_is_freeable (ins->dreg)) {
2156                 regmask &= ~ (1 << ins->dreg);
2157                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2158         }
2159
2160         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2161         g_assert (regmask); /* need at least a register we can free */
2162         sel = -1;
2163         /* we should track prev_use and spill the register that's farther */
2164         for (i = 0; i < MONO_MAX_IREGS; ++i) {
2165                 if (regmask & (1 << i)) {
2166                         sel = i;
2167                         DEBUG (g_print ("selected register %s has assignment %d\n", mono_arch_regname (sel), cfg->rs->iassign [sel]));
2168                         break;
2169                 }
2170         }
2171         i = cfg->rs->isymbolic [sel];
2172         spill = ++cfg->spill_count;
2173         cfg->rs->iassign [i] = -spill - 1;
2174         mono_regstate_free_int (cfg->rs, sel);
2175         /* we need to create a spill var and insert a load to sel after the current instruction */
2176         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2177         load->dreg = sel;
2178         load->inst_basereg = cfg->frame_reg;
2179         load->inst_offset = mono_spillvar_offset (cfg, spill);
2180         if (item->prev) {
2181                 while (ins->next != item->prev->data)
2182                         ins = ins->next;
2183         }
2184         load->next = ins->next;
2185         ins->next = load;
2186         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2187         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2188         g_assert (i == sel);
2189
2190         return sel;
2191 }
2192
2193 /*========================= End of Function ========================*/
2194
2195 /*------------------------------------------------------------------*/
2196 /*                                                                  */
2197 /* Name         - get_float_register_spilling                       */
2198 /*                                                                  */
2199 /* Function     -                                                   */
2200 /*                                                                  */
2201 /*------------------------------------------------------------------*/
2202
2203 static int
2204 get_float_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2205 {
2206         MonoInst *load;
2207         int i, sel, spill;
2208
2209         DEBUG (g_print ("start regmask to assign R%d: 0x%08x (R%d <- R%d R%d)\n", reg, regmask, ins->dreg, ins->sreg1, ins->sreg2));
2210         /* exclude the registers in the current instruction */
2211         if (reg != ins->sreg1 &&
2212             (freg_is_freeable (ins->sreg1) ||
2213              (ins->sreg1 >= MONO_MAX_FREGS &&
2214               cfg->rs->fassign [ins->sreg1] >= 0))) {
2215                 if (ins->sreg1 >= MONO_MAX_FREGS)
2216                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg1]);
2217                 else
2218                         regmask &= ~ (1 << ins->sreg1);
2219                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2220         }
2221         if (reg != ins->sreg2 &&
2222             (freg_is_freeable (ins->sreg2) ||
2223              (ins->sreg2 >= MONO_MAX_FREGS &&
2224               cfg->rs->fassign [ins->sreg2] >= 0))) {
2225                 if (ins->sreg2 >= MONO_MAX_FREGS)
2226                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg2]);
2227                 else
2228                         regmask &= ~ (1 << ins->sreg2);
2229                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2230         }
2231         if (reg != ins->dreg && freg_is_freeable (ins->dreg)) {
2232                 regmask &= ~ (1 << ins->dreg);
2233                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2234         }
2235
2236         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2237         g_assert (regmask); /* need at least a register we can free */
2238         sel = -1;
2239         /* we should track prev_use and spill the register that's farther */
2240         for (i = 0; i < MONO_MAX_FREGS; ++i) {
2241                 if (regmask & (1 << i)) {
2242                         sel = i;
2243                         DEBUG (g_print ("selected register %s has assignment %d\n",
2244                                         mono_arch_regname (sel), cfg->rs->fassign [sel]));
2245                         break;
2246                 }
2247         }
2248         i = cfg->rs->fsymbolic [sel];
2249         spill = ++cfg->spill_count;
2250         cfg->rs->fassign [i] = -spill - 1;
2251         mono_regstate_free_float(cfg->rs, sel);
2252         /* we need to create a spill var and insert a load to sel after the current instruction */
2253         MONO_INST_NEW (cfg, load, OP_LOADR8_MEMBASE);
2254         load->dreg = sel;
2255         load->inst_basereg = cfg->frame_reg;
2256         load->inst_offset = mono_spillvar_offset_float (cfg, spill);
2257         if (item->prev) {
2258                 while (ins->next != item->prev->data)
2259                         ins = ins->next;
2260         }
2261         load->next = ins->next;
2262         ins->next = load;
2263         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2264         i = mono_regstate_alloc_float (cfg->rs, 1 << sel);
2265         g_assert (i == sel);
2266
2267         return sel;
2268 }
2269
2270 /*========================= End of Function ========================*/
2271
2272 /*------------------------------------------------------------------*/
2273 /*                                                                  */
2274 /* Name         - create_copy_ins                                   */
2275 /*                                                                  */
2276 /* Function     - Create an instruction to copy from reg to reg.    */
2277 /*                                                                  */
2278 /*------------------------------------------------------------------*/
2279
2280 static MonoInst*
2281 create_copy_ins (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2282 {
2283         MonoInst *copy;
2284         MONO_INST_NEW (cfg, copy, OP_MOVE);
2285         copy->dreg = dest;
2286         copy->sreg1 = src;
2287         if (ins) {
2288                 copy->next = ins->next;
2289                 ins->next = copy;
2290         }
2291         DEBUG (g_print ("\tforced copy from %s to %s\n",
2292                         mono_arch_regname (src), mono_arch_regname (dest)));
2293         return copy;
2294 }
2295
2296 /*========================= End of Function ========================*/
2297
2298 /*------------------------------------------------------------------*/
2299 /*                                                                  */
2300 /* Name         - create_copy_ins_float                             */
2301 /*                                                                  */
2302 /* Function     - Create an instruction to copy from float reg to   */
2303 /*                float reg.                                        */
2304 /*                                                                  */
2305 /*------------------------------------------------------------------*/
2306
2307 static MonoInst*
2308 create_copy_ins_float (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2309 {
2310         MonoInst *copy;
2311         MONO_INST_NEW (cfg, copy, OP_FMOVE);
2312         copy->dreg = dest;
2313         copy->sreg1 = src;
2314         if (ins) {
2315                 copy->next = ins->next;
2316                 ins->next = copy;
2317         }
2318         DEBUG (g_print ("\tforced copy from %s to %s\n",
2319                         mono_arch_regname (src), mono_arch_regname (dest)));
2320         return copy;
2321 }
2322
2323 /*========================= End of Function ========================*/
2324
2325 /*------------------------------------------------------------------*/
2326 /*                                                                  */
2327 /* Name         - create_spilled_store                              */
2328 /*                                                                  */
2329 /* Function     - Spill register to storage.                        */
2330 /*                                                                  */
2331 /*------------------------------------------------------------------*/
2332
2333 static MonoInst*
2334 create_spilled_store (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2335 {
2336         MonoInst *store;
2337         MONO_INST_NEW (cfg, store, OP_STORE_MEMBASE_REG);
2338         store->sreg1 = reg;
2339         store->inst_destbasereg = cfg->frame_reg;
2340         store->inst_offset = mono_spillvar_offset (cfg, spill);
2341         if (ins) {
2342                 store->next = ins->next;
2343                 ins->next = store;
2344         }
2345         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2346                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2347         return store;
2348 }
2349
2350 /*========================= End of Function ========================*/
2351
2352 /*------------------------------------------------------------------*/
2353 /*                                                                  */
2354 /* Name         - create_spilled_store_float                        */
2355 /*                                                                  */
2356 /* Function     - Spill floating point register to storage.         */
2357 /*                                                                  */
2358 /*------------------------------------------------------------------*/
2359
2360 static MonoInst*
2361 create_spilled_store_float (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2362 {
2363         MonoInst *store;
2364         MONO_INST_NEW (cfg, store, OP_STORER8_MEMBASE_REG);
2365         store->sreg1 = reg;
2366         store->inst_destbasereg = cfg->frame_reg;
2367         store->inst_offset = mono_spillvar_offset_float (cfg, spill);
2368         if (ins) {
2369                 store->next = ins->next;
2370                 ins->next = store;
2371         }
2372         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2373                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2374         return store;
2375 }
2376
2377 /*========================= End of Function ========================*/
2378
2379 /*------------------------------------------------------------------*/
2380 /*                                                                  */
2381 /* Name         - insert_before_ins                                 */
2382 /*                                                                  */
2383 /* Function     - Insert an instruction before another.             */
2384 /*                                                                  */
2385 /*------------------------------------------------------------------*/
2386
2387 static void
2388 insert_before_ins (MonoInst *ins, InstList *item, MonoInst* to_insert)
2389 {
2390         MonoInst *prev;
2391         g_assert (item->next);
2392         prev = item->next->data;
2393
2394         while (prev->next != ins)
2395                 prev = prev->next;
2396         to_insert->next = ins;
2397         prev->next = to_insert;
2398         /*
2399          * needed otherwise in the next instruction we can add an ins to the
2400          * end and that would get past this instruction.
2401          */
2402         item->data = to_insert;
2403 }
2404
2405 /*========================= End of Function ========================*/
2406
2407 /*------------------------------------------------------------------*/
2408 /*                                                                  */
2409 /* Name         - alloc_int_reg                                     */
2410 /*                                                                  */
2411 /* Function     - Allocate a general register.                      */
2412 /*                                                                  */
2413 /*------------------------------------------------------------------*/
2414
2415 static int
2416 alloc_int_reg (MonoCompile *cfg, InstList *curinst, MonoInst *ins, int sym_reg, guint32 allow_mask)
2417 {
2418         int val = cfg->rs->iassign [sym_reg];
2419         DEBUG (g_print ("Allocating a general register for %d (%d) with mask %08x\n",val,sym_reg,allow_mask));
2420         if (val < 0) {
2421                 int spill = 0;
2422                 if (val < -1) {
2423                         /* the register gets spilled after this inst */
2424                         spill = -val -1;
2425                 }
2426                 val = mono_regstate_alloc_int (cfg->rs, allow_mask);
2427                 if (val < 0)
2428                         val = get_register_spilling (cfg, curinst, ins, allow_mask, sym_reg);
2429                 cfg->rs->iassign [sym_reg] = val;
2430                 /* add option to store before the instruction for src registers */
2431                 if (spill)
2432                         create_spilled_store (cfg, spill, val, sym_reg, ins);
2433         }
2434         DEBUG (g_print ("Allocated %d for %d\n",val,sym_reg));
2435         cfg->rs->isymbolic [val] = sym_reg;
2436         return val;
2437 }
2438
2439 /*========================= End of Function ========================*/
2440
2441 /*------------------------------------------------------------------*/
2442 /*                                                                  */
2443 /* Name         - mono_arch_local_regalloc.                         */
2444 /*                                                                  */
2445 /* Function     - We first scan the list of instructions and we     */
2446 /*                save the liveness information of each register    */
2447 /*                (when the register is first used, when its value  */
2448 /*                is set etc.). We also reverse the list of instr-  */
2449 /*                uctions (in the InstList list) because assigning  */
2450 /*                registers backwards allows for more tricks to be  */
2451 /*                used.                                             */
2452 /*                                                                  */
2453 /*------------------------------------------------------------------*/
2454
2455 void
2456 mono_arch_local_regalloc (MonoCompile *cfg, MonoBasicBlock *bb)
2457 {
2458         MonoInst *ins;
2459         MonoRegState *rs = cfg->rs;
2460         int i, val;
2461         RegTrack *reginfo, *reginfof;
2462         RegTrack *reginfo1, *reginfo2, *reginfod;
2463         InstList *tmp, *reversed = NULL;
2464         const char *spec;
2465         guint32 src1_mask, src2_mask, dest_mask;
2466         guint32 cur_iregs, cur_fregs;
2467
2468         if (!bb->code)
2469                 return;
2470         rs->next_vireg = bb->max_ireg;
2471         rs->next_vfreg = bb->max_freg;
2472         mono_regstate_assign (rs);
2473         reginfo = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vireg);
2474         reginfof = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vfreg);
2475         rs->ifree_mask = S390_CALLER_REGS;
2476         rs->ffree_mask = S390_CALLER_FREGS;
2477
2478         ins = bb->code;
2479         i = 1;
2480         DEBUG (g_print ("LOCAL regalloc: basic block: %d\n", bb->block_num));
2481         /* forward pass on the instructions to collect register liveness info */
2482         while (ins) {
2483                 spec = ins_spec [ins->opcode];
2484                 DEBUG (print_ins (i, ins));
2485                 if (spec [MONO_INST_CLOB] == 'c') {
2486                         MonoCallInst * call = (MonoCallInst*)ins;
2487                         int j;
2488                 }
2489                 if (spec [MONO_INST_SRC1]) {
2490                         if (spec [MONO_INST_SRC1] == 'f')
2491                                 reginfo1 = reginfof;
2492                         else
2493                                 reginfo1 = reginfo;
2494                         reginfo1 [ins->sreg1].prev_use = reginfo1 [ins->sreg1].last_use;
2495                         reginfo1 [ins->sreg1].last_use = i;
2496                 } else {
2497                         ins->sreg1 = -1;
2498                 }
2499                 if (spec [MONO_INST_SRC2]) {
2500                         if (spec [MONO_INST_SRC2] == 'f')
2501                                 reginfo2 = reginfof;
2502                         else
2503                                 reginfo2 = reginfo;
2504                         reginfo2 [ins->sreg2].prev_use = reginfo2 [ins->sreg2].last_use;
2505                         reginfo2 [ins->sreg2].last_use = i;
2506                 } else {
2507                         ins->sreg2 = -1;
2508                 }
2509                 if (spec [MONO_INST_DEST]) {
2510                         if (spec [MONO_INST_DEST] == 'f')
2511                                 reginfod = reginfof;
2512                         else
2513                                 reginfod = reginfo;
2514                         if (spec [MONO_INST_DEST] != 'b') /* it's not just a base register */
2515                                 reginfod [ins->dreg].killed_in = i;
2516                         reginfod [ins->dreg].prev_use = reginfod [ins->dreg].last_use;
2517                         reginfod [ins->dreg].last_use = i;
2518                         if (reginfod [ins->dreg].born_in == 0 || reginfod [ins->dreg].born_in > i)
2519                                 reginfod [ins->dreg].born_in = i;
2520                         if (spec [MONO_INST_DEST] == 'l') {
2521                                 /* result in eax:edx, the virtual register is allocated sequentially */
2522                                 reginfod [ins->dreg + 1].prev_use = reginfod [ins->dreg + 1].last_use;
2523                                 reginfod [ins->dreg + 1].last_use = i;
2524                                 if (reginfod [ins->dreg + 1].born_in == 0 || reginfod [ins->dreg + 1].born_in > i)
2525                                         reginfod [ins->dreg + 1].born_in = i;
2526                         }
2527                 } else {
2528                         ins->dreg = -1;
2529                 }
2530                 reversed = inst_list_prepend (cfg->mempool, reversed, ins);
2531                 ++i;
2532                 ins = ins->next;
2533         }
2534
2535         cur_iregs = S390_CALLER_REGS;
2536         cur_fregs = S390_CALLER_FREGS;
2537
2538         DEBUG (print_regtrack (reginfo, rs->next_vireg));
2539         DEBUG (print_regtrack (reginfof, rs->next_vfreg));
2540         tmp = reversed;
2541         while (tmp) {
2542                 int prev_dreg, prev_sreg1, prev_sreg2;
2543                 --i;
2544                 ins = tmp->data;
2545                 spec = ins_spec [ins->opcode];
2546                 DEBUG (g_print ("processing:"));
2547                 DEBUG (print_ins (i, ins));
2548                 /* make the register available for allocation: FIXME add fp reg */
2549                 if (ins->opcode == OP_SETREG || ins->opcode == OP_SETREGIMM) {
2550                         cur_iregs |= 1 << ins->dreg;
2551                         DEBUG (g_print ("adding %d to cur_iregs\n", ins->dreg));
2552                 } else if (ins->opcode == OP_SETFREG) {
2553                         cur_fregs |= 1 << ins->dreg;
2554                         DEBUG (g_print ("adding %d to cur_fregs\n", ins->dreg));
2555                 } else if (spec [MONO_INST_CLOB] == 'c') {
2556                         MonoCallInst *cinst = (MonoCallInst*)ins;
2557                         DEBUG (g_print ("excluding regs 0x%x from cur_iregs (0x%x)\n",
2558                                         cinst->used_iregs, cur_iregs));
2559                         DEBUG (g_print ("excluding fpregs 0x%x from cur_fregs (0x%x)\n",
2560                                         cinst->used_fregs, cur_fregs));
2561                         cur_iregs &= ~cinst->used_iregs;
2562                         cur_fregs &= ~cinst->used_fregs;
2563                         DEBUG (g_print ("available cur_iregs: 0x%x\n", cur_iregs));
2564                         DEBUG (g_print ("available cur_fregs: 0x%x\n", cur_fregs));
2565                         /*------------------------------------------------------------*/
2566                         /* registers used by the calling convention are excluded from */
2567                         /* allocation: they will be selectively enabled when they are */
2568                         /* assigned by the special SETREG opcodes.                    */
2569                         /*------------------------------------------------------------*/
2570                 }
2571                 dest_mask = src1_mask = src2_mask = cur_iregs;
2572                 /*------------------------------------------------------*/
2573                 /* update for use with FP regs...                       */
2574                 /*------------------------------------------------------*/
2575                 if (spec [MONO_INST_DEST] == 'f') {
2576                         dest_mask = cur_fregs;
2577                         if (ins->dreg >= MONO_MAX_FREGS) {
2578                                 val = rs->fassign [ins->dreg];
2579                                 prev_dreg = ins->dreg;
2580                                 if (val < 0) {
2581                                         int spill = 0;
2582                                         if (val < -1) {
2583                                                 /* the register gets spilled after this inst */
2584                                                 spill = -val -1;
2585                                         }
2586                                         val = mono_regstate_alloc_float (rs, dest_mask);
2587                                         if (val < 0)
2588                                                 val = get_float_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2589                                         rs->fassign [ins->dreg] = val;
2590                                         if (spill)
2591                                                 create_spilled_store_float (cfg, spill, val, prev_dreg, ins);
2592                                 }
2593                                 DEBUG (g_print ("\tassigned dreg %s to dest R%d\n",
2594                                                 mono_arch_regname (val), ins->dreg));
2595                                 rs->fsymbolic [val] = prev_dreg;
2596                                 ins->dreg = val;
2597                                 if (spec [MONO_INST_CLOB] == 'c' && ins->dreg != s390_f0) {
2598                                         /* this instruction only outputs to s390_f0, need to copy */
2599                                         create_copy_ins_float (cfg, ins->dreg, s390_f0, ins);
2600                                 }
2601                         } else {
2602                                 prev_dreg = -1;
2603                         }
2604                         if (freg_is_freeable (ins->dreg) && prev_dreg >= 0 && (reginfof [prev_dreg].born_in >= i || !(cur_fregs & (1 << ins->dreg)))) {
2605                                 DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2606                                 mono_regstate_free_float (rs, ins->dreg);
2607                         }
2608                 } else if (ins->dreg >= MONO_MAX_IREGS) {
2609                         val = rs->iassign [ins->dreg];
2610                         prev_dreg = ins->dreg;
2611                         if (val < 0) {
2612                                 int spill = 0;
2613                                 if (val < -1) {
2614                                         /* the register gets spilled after this inst */
2615                                         spill = -val -1;
2616                                 }
2617                                 val = mono_regstate_alloc_int (rs, dest_mask);
2618                                 if (val < 0)
2619                                         val = get_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2620                                 rs->iassign [ins->dreg] = val;
2621                                 if (spill)
2622                                         create_spilled_store (cfg, spill, val, prev_dreg, ins);
2623                         }
2624                         DEBUG (g_print ("\tassigned dreg %s to dest R%d (prev: R%d)\n",
2625                                         mono_arch_regname (val), ins->dreg, prev_dreg));
2626                         rs->isymbolic [val] = prev_dreg;
2627                         ins->dreg = val;
2628                         if (spec [MONO_INST_DEST] == 'l') {
2629                                 int hreg = prev_dreg + 1;
2630                                 val = rs->iassign [hreg];
2631                                 if (val < 0) {
2632                                         int spill = 0;
2633                                         if (val < -1) {
2634                                                 /* the register gets spilled after this inst */
2635                                                 spill = -val -1;
2636                                         }
2637                                         val = mono_regstate_alloc_int (rs, dest_mask);
2638                                         if (val < 0)
2639                                                 val = get_register_spilling (cfg, tmp, ins, dest_mask, hreg);
2640                                         rs->iassign [hreg] = val;
2641                                         if (spill)
2642                                                 create_spilled_store (cfg, spill, val, hreg, ins);
2643                                 }
2644                                 DEBUG (g_print ("\tassigned hreg %s to dest R%d\n", mono_arch_regname (val), hreg));
2645                                 rs->isymbolic [val] = hreg;
2646                                 /* FIXME:? ins->dreg = val; */
2647                                 if (ins->dreg == s390_r3) {
2648                                         if (val != s390_r2)
2649                                                 create_copy_ins (cfg, val, s390_r2, ins);
2650                                 } else if (ins->dreg == s390_r2) {
2651                                         if (val == s390_r3) {
2652                                                 /* swap */
2653                                                 create_copy_ins (cfg, s390_r3, s390_r0, ins);
2654                                                 create_copy_ins (cfg, s390_r2, s390_r3, ins);
2655                                                 create_copy_ins (cfg, s390_r0, s390_r2, ins);
2656                                         } else {
2657                                                 /* two forced copies */
2658                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2659                                                 create_copy_ins (cfg, val, s390_r2, ins);
2660                                         }
2661                                 } else {
2662                                         if (val == s390_r2) {
2663                                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2664                                         } else {
2665                                                 /* two forced copies */
2666                                                 create_copy_ins (cfg, val, s390_r2, ins);
2667                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2668                                         }
2669                                 }
2670                                 if (reg_is_freeable (val) && hreg >= 0 && (reginfo [hreg].born_in >= i && !(cur_iregs & (1 << val)))) {
2671                                         DEBUG (g_print ("\tfreeable %s (R%d)\n", mono_arch_regname (val), hreg));
2672                                         mono_regstate_free_int (rs, val);
2673                                 }
2674                         } else if (spec [MONO_INST_DEST] == 'a' && ins->dreg != s390_r2 && spec [MONO_INST_CLOB] != 'd') {
2675                                 /* this instruction only outputs to s390_r2, need to copy */
2676                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2677                         }
2678                 } else {
2679                         prev_dreg = -1;
2680                 }
2681                 if (spec [MONO_INST_DEST] == 'f' &&
2682                     freg_is_freeable (ins->dreg) &&
2683                     prev_dreg >= 0 && (reginfof [prev_dreg].born_in >= i)) {
2684                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2685                         mono_regstate_free_float (rs, ins->dreg);
2686                 } else if (spec [MONO_INST_DEST] != 'f' &&
2687                            reg_is_freeable (ins->dreg) &&
2688                            prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i)) {
2689                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2690                          mono_regstate_free_int (rs, ins->dreg);
2691                 }
2692                 if (spec [MONO_INST_SRC1] == 'f') {
2693                         src1_mask = cur_fregs;
2694                         if (ins->sreg1 >= MONO_MAX_FREGS) {
2695                                 val = rs->fassign [ins->sreg1];
2696                                 prev_sreg1 = ins->sreg1;
2697                                 if (val < 0) {
2698                                         int spill = 0;
2699                                         if (val < -1) {
2700                                                 /* the register gets spilled after this inst */
2701                                                 spill = -val -1;
2702                                         }
2703                                         //g_assert (val == -1); /* source cannot be spilled */
2704                                         val = mono_regstate_alloc_float (rs, src1_mask);
2705                                         if (val < 0)
2706                                                 val = get_float_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2707                                         rs->fassign [ins->sreg1] = val;
2708                                         DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2709                                         if (spill) {
2710                                                 MonoInst *store = create_spilled_store_float (cfg, spill, val, prev_sreg1, NULL);
2711                                                 insert_before_ins (ins, tmp, store);
2712                                         }
2713                                 }
2714                                 rs->fsymbolic [val] = prev_sreg1;
2715                                 ins->sreg1 = val;
2716                         } else {
2717                                 prev_sreg1 = -1;
2718                         }
2719                 } else if (ins->sreg1 >= MONO_MAX_IREGS) {
2720                         val = rs->iassign [ins->sreg1];
2721                         prev_sreg1 = ins->sreg1;
2722                         if (val < 0) {
2723                                 int spill = 0;
2724                                 if (val < -1) {
2725                                         /* the register gets spilled after this inst */
2726                                         spill = -val -1;
2727                                 }
2728                                 val = mono_regstate_alloc_int (rs, src1_mask);
2729                                 if (val < 0)
2730                                         val = get_register_spilling (cfg, tmp, ins,
2731                                                                      src1_mask,
2732                                                                      ins->sreg1);
2733                                 rs->iassign [ins->sreg1] = val;
2734                                 DEBUG (g_print ("\tassigned sreg1 %s to R%d\n",
2735                                                 mono_arch_regname (val), ins->sreg1));
2736                                 if (spill) {
2737                                         MonoInst *store;
2738                                         store = create_spilled_store (cfg, spill, val,
2739                                                                       prev_sreg1, NULL);
2740                                         insert_before_ins (ins, tmp, store);
2741                                 }
2742                         }
2743                         rs->isymbolic [val] = prev_sreg1;
2744                         ins->sreg1 = val;
2745                 } else {
2746                         prev_sreg1 = -1;
2747                 }
2748                 /*----------------------------------------------*/
2749                 /* handle clobbering of sreg1                   */
2750                 /*----------------------------------------------*/
2751                 if ((spec [MONO_INST_CLOB] == '1' ||
2752                      spec [MONO_INST_CLOB] == 's') &&
2753                     ins->dreg != ins->sreg1) {
2754                         MonoInst *copy;
2755                         copy = create_copy_ins (cfg, ins->dreg, ins->sreg1, NULL);
2756                         DEBUG (g_print ("\tneed to copy sreg1 %s to dreg %s\n",
2757                                         mono_arch_regname (ins->sreg1),
2758                                         mono_arch_regname (ins->dreg)));
2759                         if (ins->sreg2 == -1 || spec [MONO_INST_CLOB] == 's') {
2760                                 /* note: the copy is inserted before the current instruction! */
2761                                 insert_before_ins (ins, tmp, copy);
2762                                 /* we set sreg1 to dest as well */
2763                                 prev_sreg1 = ins->sreg1 = ins->dreg;
2764                         } else {
2765                                 /* inserted after the operation */
2766                                 copy->next = ins->next;
2767                                 ins->next  = copy;
2768                         }
2769                 }
2770
2771                 if (spec [MONO_INST_SRC2] == 'f') {
2772                         src2_mask = cur_fregs;
2773                         if (ins->sreg2 >= MONO_MAX_FREGS) {
2774                                 val = rs->fassign [ins->sreg2];
2775                                 prev_sreg2 = ins->sreg2;
2776                                 if (val < 0) {
2777                                         int spill = 0;
2778                                         if (val < -1) {
2779                                                 /* the register gets spilled after this inst */
2780                                                 spill = -val -1;
2781                                         }
2782                                         val = mono_regstate_alloc_float (rs, src2_mask);
2783                                         if (val < 0)
2784                                                 val = get_float_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2785                                         rs->fassign [ins->sreg2] = val;
2786                                         DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2787                                         if (spill)
2788                                                 create_spilled_store_float (cfg, spill, val, prev_sreg2, ins);
2789                                 }
2790                                 rs->fsymbolic [val] = prev_sreg2;
2791                                 ins->sreg2 = val;
2792                         } else {
2793                                 prev_sreg2 = -1;
2794                         }
2795                 } else if (ins->sreg2 >= MONO_MAX_IREGS) {
2796                         val = rs->iassign [ins->sreg2];
2797                         prev_sreg2 = ins->sreg2;
2798                         if (val < 0) {
2799                                 int spill = 0;
2800                                 if (val < -1) {
2801                                         /* the register gets spilled after this inst */
2802                                         spill = -val -1;
2803                                 }
2804                                 val = mono_regstate_alloc_int (rs, src2_mask);
2805                                 if (val < 0)
2806                                         val = get_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2807                                 rs->iassign [ins->sreg2] = val;
2808                                 DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2809                                 if (spill)
2810                                         create_spilled_store (cfg, spill, val, prev_sreg2, ins);
2811                         }
2812                         rs->isymbolic [val] = prev_sreg2;
2813                         ins->sreg2 = val;
2814                 } else {
2815                         prev_sreg2 = -1;
2816                 }
2817
2818                 if (spec [MONO_INST_CLOB] == 'c') {
2819                         int j, s;
2820                         guint32 clob_mask = S390_CALLER_REGS;
2821                         for (j = 0; j < MONO_MAX_IREGS; ++j) {
2822                                 s = 1 << j;
2823                                 if ((clob_mask & s) && !(rs->ifree_mask & s) && j != ins->sreg1) {
2824                                         //g_warning ("register %s busy at call site\n", mono_arch_regname (j));
2825                                 }
2826                         }
2827                 }
2828                 /*if (reg_is_freeable (ins->sreg1) && prev_sreg1 >= 0 && reginfo [prev_sreg1].born_in >= i) {
2829                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg1)));
2830                         mono_regstate_free_int (rs, ins->sreg1);
2831                 }
2832                 if (reg_is_freeable (ins->sreg2) && prev_sreg2 >= 0 && reginfo [prev_sreg2].born_in >= i) {
2833                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg2)));
2834                         mono_regstate_free_int (rs, ins->sreg2);
2835                 }*/
2836
2837                 //DEBUG (print_ins (i, ins));
2838                 tmp = tmp->next;
2839         }
2840 }
2841
2842 /*========================= End of Function ========================*/
2843
2844 /*------------------------------------------------------------------*/
2845 /*                                                                  */
2846 /* Name         - emit_float_to_int                                 */
2847 /*                                                                  */
2848 /* Function     - Create instructions which will convert a floating */
2849 /*                point value to integer.                           */
2850 /*                                                                  */
2851 /*------------------------------------------------------------------*/
2852
2853 static guchar*
2854 emit_float_to_int (MonoCompile *cfg, guchar *code, int dreg, int sreg, int size, gboolean is_signed)
2855 {
2856         /* sreg is a float, dreg is an integer reg. */
2857         if (is_signed) {
2858                 s390_cfdbr (code, dreg, 5, sreg);
2859         } else {
2860                 s390_basr   (code, s390_r13, 0);
2861                 s390_j      (code, 10);
2862                 s390_double (code, 0x41e0000000000000);
2863                 s390_double (code, 0x41f0000000000000);
2864                 s390_ldr    (code, s390_f0, sreg);
2865                 s390_cdb    (code, s390_f0, 0, s390_r13, 0);
2866                 s390_jl     (code, 10);
2867                 s390_sdb    (code, s390_f0, 0, s390_r13, 8);
2868                 s390_cfdbr  (code, dreg, 7, s390_f0);
2869                 s390_j      (code, 5);
2870                 s390_cfdbr  (code, dreg, 5, sreg);
2871         }
2872         return code;
2873 }
2874
2875 /*========================= End of Function ========================*/
2876
2877 /*------------------------------------------------------------------*/
2878 /*                                                                  */
2879 /* Name         - mono_emit_stack_alloc                             */
2880 /*                                                                  */
2881 /* Function     -                                                   */
2882 /*                                                                  */
2883 /*------------------------------------------------------------------*/
2884
2885 static unsigned char*
2886 mono_emit_stack_alloc (guchar *code, MonoInst* tree)
2887 {
2888         return code;
2889 }
2890
2891 /*========================= End of Function ========================*/
2892
2893 /*------------------------------------------------------------------*/
2894 /*                                                                  */
2895 /* Name         - mono_arch_output_basic_block                      */
2896 /*                                                                  */
2897 /* Function     - Perform the "real" work of emitting instructions  */
2898 /*                that will do the work of in the basic block.      */
2899 /*                                                                  */
2900 /*------------------------------------------------------------------*/
2901
2902 void
2903 mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
2904 {
2905         MonoInst *ins;
2906         MonoCallInst *call;
2907         guint offset;
2908         guint8 *code = cfg->native_code + cfg->code_len;
2909         MonoInst *last_ins = NULL;
2910         guint last_offset = 0;
2911         int max_len, cpos;
2912 guint8 cond;
2913
2914         if (cfg->opt & MONO_OPT_PEEPHOLE)
2915                 peephole_pass (cfg, bb);
2916
2917         /* we don't align basic blocks of loops on s390 */
2918
2919         if (cfg->verbose_level > 2)
2920                 g_print ("Basic block %d starting at offset 0x%x\n", bb->block_num, bb->native_offset);
2921
2922         cpos = bb->max_offset;
2923
2924         if (cfg->prof_options & MONO_PROFILE_COVERAGE) {
2925                 //MonoCoverageInfo *cov = mono_get_coverage_info (cfg->method);
2926                 //g_assert (!mono_compile_aot);
2927                 //cpos += 6;
2928                 //if (bb->cil_code)
2929                 //      cov->data [bb->dfn].iloffset = bb->cil_code - cfg->cil_code;
2930                 /* this is not thread save, but good enough */
2931                 /* fixme: howto handle overflows? */
2932                 //x86_inc_mem (code, &cov->data [bb->dfn].count);
2933         }
2934
2935         ins = bb->code;
2936         while (ins) {
2937                 offset = code - cfg->native_code;
2938
2939                 max_len = ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
2940
2941                 if (offset > (cfg->code_size - max_len - 16)) {
2942                         cfg->code_size *= 2;
2943                         cfg->native_code = g_realloc (cfg->native_code, cfg->code_size);
2944                         code = cfg->native_code + offset;
2945                 }
2946
2947                 mono_debug_record_line_number (cfg, ins, offset);
2948
2949                 switch (ins->opcode) {
2950                 case OP_STOREI1_MEMBASE_IMM: {
2951                         s390_lhi (code, s390_r14, ins->inst_imm);
2952                         if (s390_is_uimm12(ins->inst_offset))
2953                                 s390_stc (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2954                         else {
2955                                 s390_basr (code, s390_r13, 0);
2956                                 s390_j    (code, 4);
2957                                 s390_word (code, ins->inst_offset);
2958                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2959                                 s390_stc  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2960                         }
2961                 }
2962                         break;
2963                 case OP_STOREI2_MEMBASE_IMM: {
2964                         s390_lhi (code, s390_r14, ins->inst_imm);
2965                         if (s390_is_uimm12(ins->inst_offset)) {
2966                                 s390_sth (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2967                         } else {
2968                                 s390_basr (code, s390_r14, 0);
2969                                 s390_j    (code, 4);
2970                                 s390_word (code, ins->inst_offset);
2971                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2972                                 s390_sth  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2973                         }
2974                 }
2975                         break;
2976                 case OP_STORE_MEMBASE_IMM:
2977                 case OP_STOREI4_MEMBASE_IMM: {
2978                         if (s390_is_imm16(ins->inst_imm)) {
2979                                 s390_lhi  (code, s390_r14, ins->inst_imm);
2980                         } else {
2981                                 s390_basr (code, s390_r13, 0);
2982                                 s390_j    (code, 4);
2983                                 s390_word (code, ins->inst_imm);
2984                                 s390_l    (code, s390_r14, 0, s390_r13, 4);
2985                         }
2986                         if (s390_is_uimm12(ins->inst_offset)) {
2987                                 s390_st  (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2988                         } else {
2989                                 s390_basr (code, s390_r13, 0);
2990                                 s390_j    (code, 4);
2991                                 s390_word (code, ins->inst_offset);
2992                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2993                                 s390_st   (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2994                         }
2995                 }
2996                         break;
2997                 case OP_STOREI1_MEMBASE_REG: {
2998                         if (s390_is_uimm12(ins->inst_offset)) {
2999                                 s390_stc  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3000                         } else {
3001                                 s390_basr (code, s390_r13, 0);
3002                                 s390_j    (code, 4);
3003                                 s390_word (code, ins->inst_offset);
3004                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3005                                 s390_stc  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3006                         }
3007                 }
3008                         break;
3009                 case OP_STOREI2_MEMBASE_REG: {
3010                         if (s390_is_uimm12(ins->inst_offset)) {
3011                                 s390_sth  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3012                         } else {
3013                                 s390_basr (code, s390_r13, 0);
3014                                 s390_j    (code, 4);
3015                                 s390_word (code, ins->inst_offset);
3016                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3017                                 s390_sth  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3018                         }
3019                 }
3020                         break;
3021                 case OP_STORE_MEMBASE_REG:
3022                 case OP_STOREI4_MEMBASE_REG: {
3023                         if (s390_is_uimm12(ins->inst_offset)) {
3024                                 s390_st   (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3025                         } else {
3026                                 s390_basr (code, s390_r13, 0);
3027                                 s390_j    (code, 4);
3028                                 s390_word (code, ins->inst_offset);
3029                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3030                                 s390_st   (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3031                         }
3032                 }
3033                         break;
3034                 case CEE_LDIND_I:
3035                 case CEE_LDIND_I4:
3036                 case CEE_LDIND_U4: {
3037                         s390_basr (code, s390_r13, 0);
3038                         s390_j    (code, 4);
3039                         s390_word (code, ins->inst_p0);
3040                         s390_l    (code, s390_r13, 0, s390_r13, 4);
3041                         s390_l    (code, ins->dreg, 0, s390_r13, 0);
3042                 }
3043                         break;
3044                 case OP_LOADU4_MEM:
3045                         g_assert_not_reached ();
3046                         break;
3047                 case OP_LOAD_MEMBASE:
3048                 case OP_LOADI4_MEMBASE:
3049                 case OP_LOADU4_MEMBASE: {
3050                         if (s390_is_uimm12(ins->inst_offset))
3051                                 s390_l    (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3052                         else {
3053                                 if (s390_is_imm16(ins->inst_offset)) {
3054                                         s390_lhi (code, s390_r13, ins->inst_offset);
3055                                         s390_l   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3056                                 } else {
3057                                         s390_basr (code, s390_r13, 0);
3058                                         s390_j    (code, 4);
3059                                         s390_word (code, ins->inst_offset);
3060                                         s390_l    (code, s390_r13, 0, s390_r13, 4);
3061                                         s390_l    (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3062                                 }
3063                         }
3064                 }
3065                         break;
3066                 case OP_LOADU1_MEMBASE: {
3067                         s390_lhi (code, s390_r0, 0);
3068                         if (s390_is_uimm12(ins->inst_offset))
3069                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3070                         else {
3071                                 s390_basr (code, s390_r13, 0);
3072                                 s390_j    (code, 4);
3073                                 s390_word (code, ins->inst_offset);
3074                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3075                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3076                         }
3077                         s390_lr   (code, ins->dreg, s390_r0);
3078                 }
3079                         break;
3080                 case OP_LOADI1_MEMBASE: {
3081                         s390_lhi (code, s390_r0, 0);
3082                         if (s390_is_uimm12(ins->inst_offset))
3083                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3084                         else {
3085                                 s390_basr (code, s390_r13, 0);
3086                                 s390_j    (code, 4);
3087                                 s390_word (code, ins->inst_offset);
3088                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3089                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3090                         }
3091                         s390_lhi  (code, s390_r13, 0x80);
3092                         s390_nr   (code, s390_r13, s390_r0);
3093                         s390_jz   (code, 5);
3094                         s390_lhi  (code, s390_r13, 0xff00);
3095                         s390_or   (code, s390_r0, s390_r13);
3096                         s390_lr   (code, ins->dreg, s390_r0);
3097                 }
3098                         break;
3099                 case OP_LOADU2_MEMBASE: {
3100                         s390_lhi (code, s390_r0, 0);
3101                         if (s390_is_uimm12(ins->inst_offset))
3102                                 s390_icm  (code, s390_r0, 3, ins->inst_basereg, ins->inst_offset);
3103                         else {
3104                                 s390_basr (code, s390_r13, 0);
3105                                 s390_j    (code, 4);
3106                                 s390_word (code, ins->inst_offset);
3107                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3108                                 s390_ar   (code, s390_r13, ins->inst_basereg);
3109                                 s390_icm  (code, s390_r0, 3, s390_r13, 0);
3110                         }
3111                         s390_lr  (code, ins->dreg, s390_r0);
3112                 }
3113                         break;
3114                 case OP_LOADI2_MEMBASE: {
3115                         s390_lhi (code, s390_r0, 0);
3116                         if (s390_is_uimm12(ins->inst_offset))
3117                                 s390_lh   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3118                         else {
3119                                 s390_basr (code, s390_r13, 0);
3120                                 s390_j    (code, 4);
3121                                 s390_word (code, ins->inst_offset);
3122                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3123                                 s390_lh   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3124                         }
3125                         s390_lr  (code, ins->dreg, s390_r0);
3126                 }
3127                         break;
3128                 case CEE_CONV_I1: {
3129                         s390_lhi  (code, s390_r0, 0x80);
3130                         if (ins->dreg != ins->sreg1) {
3131                                 s390_lr   (code, ins->dreg, ins->sreg1);
3132                         }
3133                         s390_nr   (code, s390_r0, ins->sreg1);
3134                         s390_jl   (code, 7);
3135                         s390_lhi  (code, s390_r13, -1);
3136                         s390_sll  (code, s390_r13, 0, 8);
3137                         s390_or   (code, ins->dreg, s390_r13);
3138                 }
3139                         break;
3140                 case CEE_CONV_I2: {
3141                         s390_lhi  (code, s390_r0, 0x80);
3142                         if (ins->dreg != ins->sreg1) {
3143                                 s390_lr   (code, ins->dreg, ins->sreg1);
3144                         }
3145                         s390_nr   (code, s390_r0, ins->sreg1);
3146                         s390_jl   (code, 7);
3147                         s390_lhi  (code, s390_r13, -1);
3148                         s390_sll  (code, s390_r13, 0, 16);
3149                         s390_or   (code, ins->dreg, s390_r13);
3150                 }
3151                         break;
3152                 case CEE_CONV_U1: {
3153                         s390_lhi  (code, s390_r0, 0xff);
3154                         if (ins->dreg != ins->sreg1) {
3155                                 s390_lr   (code, ins->dreg, ins->sreg1);
3156                         }
3157                         s390_nr   (code, ins->dreg, s390_r0);
3158                 }
3159                         break;
3160                 case CEE_CONV_U2: {
3161                         s390_lhi  (code, s390_r0, -1);
3162                         s390_sll  (code, s390_r0, 0, 16);
3163                         s390_srl  (code, s390_r0, 0, 16);
3164                         if (ins->dreg != ins->sreg1) {
3165                                 s390_lr   (code, ins->dreg, ins->sreg1);
3166                         }
3167                         s390_nr   (code, ins->dreg, s390_r0);
3168                 }
3169                         break;
3170                 case OP_COMPARE: {
3171                         if ((ins->next) &&
3172                             ((ins->next->opcode >= CEE_BNE_UN) &&
3173                              (ins->next->opcode <= CEE_BLT_UN)))
3174                                 s390_clr  (code, ins->sreg1, ins->sreg2);
3175                         else
3176                                 s390_cr   (code, ins->sreg1, ins->sreg2);
3177                 }
3178                         break;
3179                 case OP_COMPARE_IMM: {
3180                         if (s390_is_imm16 (ins->inst_imm)) {
3181                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3182                                 if ((ins->next) &&
3183                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3184                                     (ins->next->opcode <= CEE_BLT_UN)))
3185                                         s390_clr  (code, ins->sreg1, s390_r0);
3186                                 else
3187                                         s390_cr   (code, ins->sreg1, s390_r0);
3188                         }
3189                         else {
3190                                 s390_basr (code, s390_r13, 0);
3191                                 s390_j    (code, 4);
3192                                 s390_word (code, ins->inst_imm);
3193                                 if ((ins->next) &&
3194                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3195                                     (ins->next->opcode <= CEE_BLT_UN)))
3196                                         s390_cl   (code, ins->sreg1, 0, s390_r13, 4);
3197                                 else
3198                                         s390_c    (code, ins->sreg1, 0, s390_r13, 4);
3199                         }
3200                 }
3201                         break;
3202                 case OP_X86_TEST_NULL: {
3203                         s390_ltr (code, ins->sreg1, ins->sreg1);
3204                 }
3205                         break;
3206                 case CEE_BREAK: {
3207                         s390_break (code);
3208                 }
3209                         break;
3210                 case OP_ADDCC: {
3211                         if (ins->dreg != ins->sreg1) {
3212                                 s390_lr   (code, ins->dreg, ins->sreg1);
3213                         }
3214                         s390_alr  (code, ins->dreg, ins->sreg2);
3215                 }
3216                         break;
3217                 case CEE_ADD: {
3218                         if (ins->dreg != ins->sreg1) {
3219                                 s390_lr   (code, ins->dreg, ins->sreg1);
3220                         }
3221                         s390_ar   (code, ins->dreg, ins->sreg2);
3222                 }
3223                         break;
3224                 case OP_ADC: {
3225                         if (ins->dreg != ins->sreg1) {
3226                                 s390_lr   (code, ins->dreg, ins->sreg1);
3227                         }
3228                         s390_alcr (code, ins->dreg, ins->sreg2);
3229                 }
3230                         break;
3231                 case OP_ADDCC_IMM:
3232                 case OP_ADD_IMM: {
3233                         if ((ins->next) &&
3234                             (ins->next->opcode == OP_ADC_IMM)) {
3235                                 s390_basr (code, s390_r13, 0);
3236                                 s390_j    (code, 4);
3237                                 s390_word (code, ins->inst_imm);
3238                                 if (ins->dreg != ins->sreg1) {
3239                                         s390_lr   (code, ins->dreg, ins->sreg1);
3240                                 }
3241                                 s390_al   (code, ins->dreg, 0, s390_r13, 4);
3242                         } else {
3243                                 if (s390_is_imm16 (ins->inst_imm)) {
3244                                         if (ins->dreg != ins->sreg1) {
3245                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3246                                         }
3247                                         s390_ahi (code, ins->dreg, ins->inst_imm);
3248                                 } else {
3249                                         s390_basr (code, s390_r13, 0);
3250                                         s390_j    (code, 4);
3251                                         s390_word (code, ins->inst_imm);
3252                                         if (ins->dreg != ins->sreg1) {
3253                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3254                                         }
3255                                         s390_a    (code, ins->dreg, 0, s390_r13, 4);
3256                                 }
3257                         }
3258                 }
3259                         break;
3260                 case OP_ADC_IMM: {
3261                         if (s390_is_imm16 (ins->inst_imm)) {
3262                                 if (ins->dreg != ins->sreg1) {
3263                                         s390_lr   (code, ins->dreg, ins->sreg1);
3264                                 }
3265                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3266                                 s390_alcr (code, ins->dreg, s390_r0);
3267                         } else {
3268                                 s390_basr (code, s390_r13, 0);
3269                                 s390_j    (code, 4);
3270                                 s390_word (code, ins->inst_imm);
3271                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3272                                 s390_alcr (code, ins->dreg, s390_r13);
3273                         }
3274                 }
3275                         break;
3276                 case OP_SUBCC: {
3277                         if (ins->dreg != ins->sreg1) {
3278                                 s390_lr   (code, ins->dreg, ins->sreg1);
3279                         }
3280                         s390_sr (code, ins->dreg, ins->sreg2);
3281                 }
3282                         break;
3283                 case CEE_SUB: {
3284                         if (ins->dreg != ins->sreg1) {
3285                                 s390_lr   (code, ins->dreg, ins->sreg1);
3286                         }
3287                         s390_sr   (code, ins->dreg, ins->sreg2);
3288                 }
3289                         break;
3290                 case OP_SBB: {
3291                         if (ins->dreg != ins->sreg1) {
3292                                 s390_lr   (code, ins->dreg, ins->sreg1);
3293                         }
3294                         s390_slbr (code, ins->dreg, ins->sreg2);
3295                 }
3296                         break;
3297                 case OP_SUBCC_IMM:
3298                 case OP_SUB_IMM: {
3299                         if (s390_is_imm16 (-ins->inst_imm)) {
3300                                 if (ins->dreg != ins->sreg1) {
3301                                         s390_lr   (code, ins->dreg, ins->sreg1);
3302                                 }
3303                                 s390_ahi  (code, ins->dreg, -ins->inst_imm);
3304                         } else {
3305                                 s390_basr (code, s390_r13, 0);
3306                                 s390_j    (code, 4);
3307                                 s390_word (code, ins->inst_imm);
3308                                 if (ins->dreg != ins->sreg1) {
3309                                         s390_lr   (code, ins->dreg, ins->sreg1);
3310                                 }
3311                                 s390_s    (code, ins->dreg, 0, s390_r13, 4);
3312                         }
3313                 }
3314                         break;
3315                 case OP_SBB_IMM: {
3316                         s390_basr (code, s390_r13, 0);
3317                         s390_j    (code, 4);
3318                         s390_word (code, ins->inst_imm);
3319                         s390_sl   (code, ins->dreg, 0, s390_r13, 4);
3320                 }
3321                         break;
3322                 case CEE_AND: {
3323                         if (ins->sreg1 == ins->dreg) {
3324                                 s390_nr   (code, ins->dreg, ins->sreg2);
3325                         }
3326                         else {
3327                                 if (ins->sreg2 == ins->dreg) {
3328                                         s390_nr  (code, ins->dreg, ins->sreg1);
3329                                 }
3330                                 else {
3331                                         s390_lr  (code, ins->dreg, ins->sreg1);
3332                                         s390_nr  (code, ins->dreg, ins->sreg2);
3333                                 }
3334                         }
3335                 }
3336                         break;
3337                 case OP_AND_IMM: {
3338                         if (s390_is_imm16 (ins->inst_imm)) {
3339                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3340                                 if (ins->dreg != ins->sreg1) {
3341                                         s390_lr   (code, ins->dreg, ins->sreg1);
3342                                 }
3343                                 s390_nr   (code, ins->dreg, s390_r0);
3344                         } else {
3345                                 s390_basr (code, s390_r13, 0);
3346                                 s390_j    (code, 4);
3347                                 s390_word (code, ins->inst_imm);
3348                                 if (ins->dreg != ins->sreg1) {
3349                                         s390_lr   (code, ins->dreg, ins->sreg1);
3350                                 }
3351                                 s390_n    (code, ins->dreg, 0, s390_r13, 4);
3352                         }
3353                 }
3354                         break;
3355                 case CEE_DIV: {
3356                         s390_lr   (code, s390_r0, ins->sreg1);
3357                         s390_srda (code, s390_r0, 0, 32);
3358                         s390_dr   (code, s390_r0, ins->sreg2);
3359                         s390_lr   (code, ins->dreg, s390_r1);
3360                 }
3361                         break;
3362                 case CEE_DIV_UN: {
3363                         s390_lr   (code, s390_r0, ins->sreg1);
3364                         s390_srdl (code, s390_r0, 0, 32);
3365                         s390_dlr  (code, s390_r0, ins->sreg2);
3366                         s390_lr   (code, ins->dreg, s390_r1);
3367                 }
3368                         break;
3369                 case OP_DIV_IMM: {
3370                         if (s390_is_imm16 (ins->inst_imm)) {
3371                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3372                                 s390_lr   (code, s390_r0, ins->sreg1);
3373                         } else {
3374                                 s390_basr (code, s390_r13, 0);
3375                                 s390_j    (code, 4);
3376                                 s390_word (code, ins->inst_imm);
3377                                 s390_lr   (code, s390_r0, ins->sreg1);
3378                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3379                         }
3380                         s390_srda (code, s390_r0, 0, 32);
3381                         s390_dr   (code, s390_r0, ins->sreg2);
3382                         s390_lr   (code, ins->dreg, s390_r1);
3383                 }
3384                         break;
3385                 case CEE_REM: {
3386                         s390_lr   (code, s390_r0, ins->sreg1);
3387                         s390_srda (code, s390_r0, 0, 32);
3388                         s390_dr   (code, s390_r0, ins->sreg2);
3389                         s390_lr   (code, ins->dreg, s390_r0);
3390                         break;
3391                 case CEE_REM_UN:
3392                         s390_lr   (code, s390_r0, ins->sreg1);
3393                         s390_srdl (code, s390_r0, 0, 32);
3394                         s390_dlr  (code, s390_r0, ins->sreg2);
3395                         s390_lr   (code, ins->dreg, s390_r0);
3396                 }
3397                         break;
3398                 case OP_REM_IMM: {
3399                         if (s390_is_imm16 (ins->inst_imm)) {
3400                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3401                                 s390_lr   (code, s390_r0, ins->sreg1);
3402                         } else {
3403                                 s390_basr (code, s390_r13, 0);
3404                                 s390_j    (code, 4);
3405                                 s390_word (code, ins->inst_imm);
3406                                 s390_lr   (code, s390_r0, ins->sreg1);
3407                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3408                         }
3409                         s390_srda (code, s390_r0, 0, 32);
3410                         s390_dr   (code, s390_r0, ins->sreg2);
3411                         s390_lr   (code, ins->dreg, s390_r0);
3412                 }
3413                         break;
3414                 case CEE_OR: {
3415                         if (ins->sreg1 == ins->dreg) {
3416                                 s390_or   (code, ins->dreg, ins->sreg2);
3417                         }
3418                         else {
3419                                 if (ins->sreg2 == ins->dreg) {
3420                                         s390_or  (code, ins->dreg, ins->sreg1);
3421                                 }
3422                                 else {
3423                                         s390_lr  (code, ins->dreg, ins->sreg1);
3424                                         s390_or  (code, ins->dreg, ins->sreg2);
3425                                 }
3426                         }
3427                 }
3428                         break;
3429                 case OP_OR_IMM: {
3430                         if (s390_is_imm16 (ins->inst_imm)) {
3431                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3432                                 if (ins->dreg != ins->sreg1) {
3433                                         s390_lr   (code, ins->dreg, ins->sreg1);
3434                                 }
3435                                 s390_or   (code, ins->dreg, s390_r0);
3436                         } else {
3437                                 s390_bras (code, s390_r13, 4);
3438                                 s390_word (code, ins->inst_imm);
3439                                 if (ins->dreg != ins->sreg1) {
3440                                         s390_lr   (code, ins->dreg, ins->sreg1);
3441                                 }
3442                                 s390_o    (code, ins->dreg, 0, s390_r13, 0);
3443                         }
3444                 }
3445                         break;
3446                 case CEE_XOR: {
3447                         if (ins->sreg1 == ins->dreg) {
3448                                 s390_xr   (code, ins->dreg, ins->sreg2);
3449                         }
3450                         else {
3451                                 if (ins->sreg2 == ins->dreg) {
3452                                         s390_xr  (code, ins->dreg, ins->sreg1);
3453                                 }
3454                                 else {
3455                                         s390_lr  (code, ins->dreg, ins->sreg1);
3456                                         s390_xr  (code, ins->dreg, ins->sreg2);
3457                                 }
3458                         }
3459                 }
3460                         break;
3461                 case OP_XOR_IMM: {
3462                         if (s390_is_imm16 (ins->inst_imm)) {
3463                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3464                                 if (ins->dreg != ins->sreg1) {
3465                                         s390_lr   (code, ins->dreg, ins->sreg1);
3466                                 }
3467                                 s390_xr   (code, ins->dreg, s390_r0);
3468                         } else {
3469                                 s390_basr (code, s390_r13, 0);
3470                                 s390_j    (code, 4);
3471                                 s390_word (code, ins->inst_imm);
3472                                 if (ins->dreg != ins->sreg1) {
3473                                         s390_lr   (code, ins->dreg, ins->sreg1);
3474                                 }
3475                                 s390_x    (code, ins->dreg, 0, s390_r13, 4);
3476                         }
3477                 }
3478                         break;
3479                 case CEE_SHL: {
3480                         if (ins->sreg1 != ins->dreg) {
3481                                 s390_lr   (code, ins->dreg, ins->sreg1);
3482                         }
3483                         s390_sll  (code, ins->dreg, ins->sreg2, 0);
3484                 }
3485                         break;
3486                 case OP_SHL_IMM: {
3487                         if (ins->sreg1 != ins->dreg) {
3488                                 s390_lr   (code, ins->dreg, ins->sreg1);
3489                         }
3490                         s390_sll  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3491                 }
3492                         break;
3493                 case CEE_SHR: {
3494                         if (ins->sreg1 != ins->dreg) {
3495                                 s390_lr   (code, ins->dreg, ins->sreg1);
3496                         }
3497                         s390_sra  (code, ins->dreg, ins->sreg2, 0);
3498                 }
3499                         break;
3500                 case OP_SHR_IMM: {
3501                         if (ins->sreg1 != ins->dreg) {
3502                                 s390_lr   (code, ins->dreg, ins->sreg1);
3503                         }
3504                         s390_sra  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3505                 }
3506                         break;
3507                 case OP_SHR_UN_IMM: {
3508                         if (ins->sreg1 != ins->dreg) {
3509                                 s390_lr   (code, ins->dreg, ins->sreg1);
3510                         }
3511                         s390_srl  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3512                 }
3513                         break;
3514                 case CEE_SHR_UN: {
3515                         if (ins->sreg1 != ins->dreg) {
3516                                 s390_lr   (code, ins->dreg, ins->sreg1);
3517                         }
3518                         s390_srl  (code, ins->dreg, ins->sreg2, 0);
3519                 }
3520                         break;
3521                 case CEE_NOT: {
3522                         if (ins->sreg1 != ins->dreg) {
3523                                 s390_lr   (code, ins->dreg, ins->sreg1);
3524                         }
3525                         s390_lhi (code, s390_r0, -1);
3526                         s390_xr  (code, ins->dreg, s390_r0);
3527                 }
3528                         break;
3529                 case CEE_NEG: {
3530                         s390_lcr (code, ins->dreg, ins->sreg1);
3531                 }
3532                         break;
3533                 case CEE_MUL: {
3534                         if (ins->sreg1 == ins->dreg) {
3535                                 s390_msr  (code, ins->dreg, ins->sreg2);
3536                         }
3537                         else {
3538                                 if (ins->sreg2 == ins->dreg) {
3539                                         s390_msr (code, ins->dreg, ins->sreg1);
3540                                 }
3541                                 else {
3542                                         s390_lr  (code, ins->dreg, ins->sreg1);
3543                                         s390_msr (code, ins->dreg, ins->sreg2);
3544                                 }
3545                         }
3546                 }
3547                         break;
3548                 case OP_MUL_IMM: {
3549                         if (s390_is_imm16 (ins->inst_imm)) {
3550                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3551                         } else {
3552                                 s390_basr (code, s390_r13, 0);
3553                                 s390_j    (code, 4);
3554                                 s390_word (code, ins->inst_imm);
3555                                 if (ins->dreg != ins->sreg1) {
3556                                         s390_lr   (code, ins->dreg, ins->sreg1);
3557                                 }
3558                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3559                         }
3560                         s390_msr  (code, ins->dreg, s390_r13);
3561                 }
3562                         break;
3563                 case CEE_MUL_OVF: {
3564                         s390_lhi  (code, s390_r0, 0);
3565                         s390_lr   (code, s390_r1, ins->sreg1);
3566                         s390_mr   (code, s390_r0, ins->sreg2);
3567                         s390_ltr  (code, s390_r0, s390_r0);
3568                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3569                         s390_lr   (code, ins->dreg, s390_r1);
3570                 }
3571                         break;
3572                 case CEE_MUL_OVF_UN: {
3573                         s390_lhi  (code, s390_r0, 0);
3574                         s390_lr   (code, s390_r1, ins->sreg1);
3575                         s390_mlr  (code, s390_r0, ins->sreg2);
3576                         s390_ltr  (code, s390_r0, s390_r0);
3577                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3578                         s390_lr   (code, ins->dreg, s390_r1);
3579                 }
3580                         break;
3581                 case OP_LMUL: {
3582                         s390_l    (code, s390_r0, 0, ins->sreg1, 4);
3583                         s390_lr   (code, s390_r14, s390_r0);
3584                         s390_srda (code, s390_r0, 0, 32);
3585                         s390_m    (code, s390_r0, 0, ins->sreg2, 4);
3586                         s390_srl  (code, s390_r14, 0, 31);
3587                         s390_a    (code, s390_r14, 0, ins->sreg1, 0);
3588                         s390_l    (code, s390_r13, 0, ins->sreg2, 0);
3589                         s390_srl  (code, s390_r13, 0, 31);
3590                         s390_ms   (code, s390_r13, 0, ins->sreg1, 4);
3591                         s390_ar   (code, s390_r14, s390_r13);
3592                         s390_st   (code, s390_r14, 0, ins->dreg, 0);
3593                         s390_st   (code, s390_r1, 0, ins->dreg, 4);
3594                 }
3595                         break;
3596                 case OP_ICONST:
3597                 case OP_SETREGIMM: {
3598                         if (s390_is_imm16(ins->inst_c0)) {
3599                                 s390_lhi  (code, ins->dreg, ins->inst_c0);
3600                         } else {
3601                                 s390_basr (code, s390_r13, 0);
3602                                 s390_j    (code, 4);
3603                                 s390_word (code, ins->inst_c0);
3604                                 s390_l    (code, ins->dreg, 0, s390_r13, 4);
3605                         }
3606                 }
3607                         break;
3608                 case OP_AOTCONST: {
3609                         s390_basr (code, s390_r13, 0);
3610                         s390_j    (code, 4);
3611                         mono_add_patch_info (cfg, code - cfg->native_code,
3612                                 (MonoJumpInfoType)ins->inst_i1, ins->inst_p0);
3613                         s390_word (code, 0);
3614                         s390_l    (code,ins->dreg, 0, s390_r13, 4);
3615                 }
3616                         break;
3617                 case CEE_CONV_I4:
3618                 case CEE_CONV_U4:
3619                 case OP_MOVE:
3620                 case OP_SETREG: {
3621                         if (ins->dreg != ins->sreg1) {
3622                                 s390_lr (code, ins->dreg, ins->sreg1);
3623                         }
3624                 }
3625                         break;
3626                 case OP_SETLRET: {
3627                         int saved = ins->sreg1;
3628                         if (ins->sreg1 == s390_r2) {
3629                                 s390_lr (code, s390_r0, ins->sreg1);
3630                                 saved = s390_r0;
3631                         }
3632                         if (ins->sreg2 != s390_r2)
3633                                 s390_lr (code, s390_r2, ins->sreg2);
3634                         if (saved != s390_r3)
3635                                 s390_lr (code, s390_r3, saved);
3636                         break;
3637                 }
3638                 case OP_SETFREG:
3639                 case OP_FMOVE: {
3640                         if (ins->dreg != ins->sreg1) {
3641                                 s390_ldr   (code, ins->dreg, ins->sreg1);
3642                         }
3643                 }
3644                         break;
3645                 case OP_FCONV_TO_R4: {
3646                         s390_ledbr (code, ins->dreg, ins->sreg1);
3647                 }
3648                         break;
3649                 case CEE_JMP:
3650                         g_assert_not_reached ();
3651                         break;
3652                 case OP_CHECK_THIS: {
3653                         /* ensure ins->sreg1 is not NULL */
3654                         s390_icm (code, s390_r0, 15, ins->sreg1, 0);
3655                 }
3656                         break;
3657                 case OP_FCALL:
3658                 case OP_LCALL:
3659                 case OP_VCALL:
3660                 case OP_VOIDCALL:
3661                 case CEE_CALL: {
3662                         call = (MonoCallInst*)ins;
3663                         if (ins->flags & MONO_INST_HAS_METHOD)
3664                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_METHOD, call->method);
3665                         else
3666                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_ABS, call->fptr);
3667                         s390_brasl (code, s390_r14, 0);
3668                 }
3669                         break;
3670                 case OP_FCALL_REG:
3671                 case OP_LCALL_REG:
3672                 case OP_VCALL_REG:
3673                 case OP_VOIDCALL_REG:
3674                 case OP_CALL_REG: {
3675                         s390_lr   (code, s390_r1, ins->sreg1);
3676                         s390_basr (code, s390_r14, s390_r1);
3677                 }
3678                         break;
3679                 case OP_FCALL_MEMBASE:
3680                 case OP_LCALL_MEMBASE:
3681                 case OP_VCALL_MEMBASE:
3682                 case OP_VOIDCALL_MEMBASE:
3683                 case OP_CALL_MEMBASE: {
3684                         s390_l    (code, s390_r1, 0, ins->sreg1, ins->inst_offset);
3685                         s390_basr (code, s390_r14, s390_r1);
3686                 }
3687                         break;
3688                 case OP_OUTARG:
3689                         g_assert_not_reached ();
3690                         break;
3691                 case OP_LOCALLOC: {
3692                         s390_lr   (code, s390_r1, ins->sreg1);
3693                         s390_ahi  (code, s390_r1, 14);
3694                         s390_srl  (code, s390_r1, 0, 3);
3695                         s390_sll  (code, s390_r1, 0, 3);
3696                         s390_l    (code, s390_r13, 0, STK_BASE, 0);
3697                         s390_lcr  (code, s390_r1, s390_r1);
3698                         s390_la   (code, STK_BASE, STK_BASE, s390_r1, 0);
3699                         s390_st   (code, s390_r13, 0, STK_BASE, 0);
3700                         s390_la   (code, ins->dreg, 0, STK_BASE, S390_MINIMAL_STACK_SIZE+7);
3701                         s390_srl  (code, ins->dreg, 0, 3);
3702                         s390_sll  (code, ins->dreg, 0, 3);
3703                 }
3704                         break;
3705                 case CEE_RET: {
3706                         s390_br  (code, s390_r14);
3707                 }
3708                         break;
3709                 case CEE_THROW: {
3710                         s390_lr (code, s390_r2, ins->sreg1);
3711                         mono_add_patch_info (cfg, code-cfg->native_code, MONO_PATCH_INFO_INTERNAL_METHOD,
3712                                              (gpointer)"mono_arch_throw_exception");
3713                         s390_brasl (code, s390_r14, 0);
3714                 }
3715                         break;
3716                 case OP_START_HANDLER: {
3717                         s390_lr   (code, s390_r0, s390_r14);
3718                         s390_st   (code, s390_r0, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3719                 }
3720                         break;
3721                 case OP_ENDFILTER: {
3722                         if (ins->sreg1 != s390_r2)
3723                                 s390_lr (code, s390_r2, ins->sreg1);
3724                         s390_l   (code, STK_BASE, 0, STK_BASE, 0);
3725                         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
3726                         s390_br  (code, s390_r14);
3727                 }
3728                         break;
3729                 case CEE_ENDFINALLY: {
3730                         s390_l   (code, s390_r14, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3731                         s390_br  (code, s390_r14);
3732                 }
3733                         break;
3734                 case OP_CALL_HANDLER: {
3735                         mono_add_patch_info (cfg, code-cfg->native_code,
3736                                              MONO_PATCH_INFO_BB, ins->inst_target_bb);
3737                         s390_brasl (code, s390_r14, 0);
3738                 }
3739                         break;
3740                 case OP_LABEL: {
3741                         ins->inst_c0 = code - cfg->native_code;
3742                 }
3743                         break;
3744                 case CEE_BR:
3745                         EMIT_UNCOND_BRANCH(ins);
3746                         break;
3747                 case OP_BR_REG: {
3748                         s390_br  (code, ins->sreg1);
3749                 }
3750                         break;
3751                 case OP_CEQ: {
3752                         s390_lhi (code, ins->dreg, 1);
3753                         s390_jz  (code, 4);
3754                         s390_lhi (code, ins->dreg, 0);
3755                 }
3756                         break;
3757                 case OP_CLT: {
3758                         s390_lhi (code, ins->dreg, 1);
3759                         s390_jl  (code, 4);
3760                         s390_lhi (code, ins->dreg, 0);
3761                 }
3762                         break;
3763                 case OP_CLT_UN: {
3764                         s390_lhi (code, ins->dreg, 1);
3765                         s390_jlo (code, 4);
3766                         s390_lhi (code, ins->dreg, 0);
3767                 }
3768                         break;
3769                 case OP_CGT: {
3770                         s390_lhi (code, ins->dreg, 1);
3771                         s390_jh  (code, 4);
3772                         s390_lhi (code, ins->dreg, 0);
3773                 }
3774                         break;
3775                 case OP_CGT_UN: {
3776                         s390_lhi (code, ins->dreg, 1);
3777                         s390_jho (code, 4);
3778                         s390_lhi (code, ins->dreg, 0);
3779                 }
3780                         break;
3781                 case OP_COND_EXC_EQ:
3782                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_EQ, ins->inst_p1);
3783                         break;
3784                 case OP_COND_EXC_NE_UN:
3785                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NE, ins->inst_p1);
3786                         break;
3787                 case OP_COND_EXC_LT:
3788                 case OP_COND_EXC_LT_UN:
3789                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LT, ins->inst_p1);
3790                         break;
3791                 case OP_COND_EXC_GT:
3792                 case OP_COND_EXC_GT_UN:
3793                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GT, ins->inst_p1);
3794                         break;
3795                 case OP_COND_EXC_GE:
3796                 case OP_COND_EXC_GE_UN:
3797                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GE, ins->inst_p1);
3798                         break;
3799                 case OP_COND_EXC_LE:
3800                 case OP_COND_EXC_LE_UN:
3801                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LE, ins->inst_p1);
3802                         break;
3803                 case OP_COND_EXC_OV:
3804                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_OV, ins->inst_p1);
3805                         break;
3806                 case OP_COND_EXC_NO:
3807                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NO, ins->inst_p1);
3808                         break;
3809                 case OP_COND_EXC_C:
3810                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_CY, ins->inst_p1);
3811                         break;
3812                 case OP_COND_EXC_NC:
3813                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NC, ins->inst_p1);
3814                         break;
3815                 case CEE_BEQ:
3816                         EMIT_COND_BRANCH (ins, S390_CC_EQ);
3817                         break;
3818                 case CEE_BNE_UN:
3819                         EMIT_COND_BRANCH (ins, S390_CC_NE);
3820                         break;
3821                 case CEE_BLT:
3822                 case CEE_BLT_UN:
3823                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3824                         break;
3825                 case CEE_BGT:
3826                 case CEE_BGT_UN:
3827                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3828                         break;
3829                 case CEE_BGE:
3830                 case CEE_BGE_UN:
3831                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3832                         break;
3833                 case CEE_BLE:
3834                 case CEE_BLE_UN:
3835                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3836                         break;
3837
3838                 /* floating point opcodes */
3839                 case OP_R8CONST: {
3840                         if (*((float *) ins->inst_p0) == 0) {
3841                                 s390_lzdr (code, ins->dreg);
3842                         } else {
3843                                 s390_basr  (code, s390_r13, 0);
3844                                 s390_j     (code, 4);
3845                                 s390_word  (code, ins->inst_p0);
3846                                 s390_l     (code, s390_r13, 0, s390_r13, 4);
3847                                 s390_ld    (code, ins->dreg, 0, s390_r13, 0);
3848                         }
3849                 }
3850                         break;
3851                 case OP_R4CONST: {
3852                         if (*((float *) ins->inst_p0) == 0) {
3853                                 s390_lzer (code, ins->dreg);
3854                         } else {
3855                                 s390_basr (code, s390_r13, 0);
3856                                 s390_j    (code, 4);
3857                                 s390_word (code, ins->inst_p0);
3858                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3859                                 s390_le   (code, ins->dreg, 0, s390_r13, 0);
3860                                 s390_ldebr(code, ins->dreg, ins->dreg);
3861                         }
3862                 }
3863                         break;
3864                 case OP_STORER8_MEMBASE_REG: {
3865                         if (s390_is_uimm12(ins->inst_offset)) {
3866                                 s390_std  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3867                         } else {
3868                                 s390_basr (code, s390_r13, 0);
3869                                 s390_j    (code, 4);
3870                                 s390_word (code, ins->inst_offset);
3871                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3872                                 s390_std  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3873                         }
3874                 }
3875                         break;
3876                 case OP_LOADR8_MEMBASE: {
3877                         if (s390_is_uimm12(ins->inst_offset)) {
3878                                 s390_ld   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3879                         } else {
3880                                 s390_basr (code, s390_r13, 0);
3881                                 s390_j    (code, 4);
3882                                 s390_word (code, ins->inst_offset);
3883                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3884                                 s390_ld   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3885                         }
3886                 }
3887                         break;
3888                 case OP_STORER4_MEMBASE_REG: {
3889                         if (s390_is_uimm12(ins->inst_offset)) {
3890                                 s390_ledbr(code, s390_f0, ins->sreg1);
3891                                 s390_ste  (code, s390_f0, 0, ins->inst_destbasereg, ins->inst_offset);
3892                         } else {
3893                                 s390_basr (code, s390_r13, 0);
3894                                 s390_j    (code, 4);
3895                                 s390_word (code, ins->inst_offset);
3896                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3897                                 s390_ledbr(code, s390_f0, ins->sreg1);
3898                                 s390_ste  (code, s390_f0, s390_r13, ins->inst_destbasereg, 0);
3899                         }
3900                 }
3901                         break;
3902                 case OP_LOADR4_MEMBASE: {
3903                         if (s390_is_uimm12(ins->inst_offset)) {
3904                                 s390_le   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3905                         } else {
3906                                 s390_basr (code, s390_r13, 0);
3907                                 s390_j    (code, 4);
3908                                 s390_word (code, ins->inst_offset);
3909                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3910                                 s390_le   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3911                         }
3912                         s390_ldebr (code, ins->dreg, ins->dreg);
3913                 }
3914                         break;
3915                 case CEE_CONV_R_UN: {
3916                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3917                         s390_ltr   (code, ins->sreg1, ins->sreg1);
3918                         s390_jnl   (code, 12);
3919                         s390_basr  (code, s390_r13, 0);
3920                         s390_j     (code, 6);
3921                         s390_word  (code, 0x41f00000);
3922                         s390_word  (code, 0);
3923                         s390_adb   (code, ins->dreg, 0, s390_r13, 4);
3924                 }
3925                         break;
3926                 case CEE_CONV_R4: {
3927                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3928                 }
3929                         break;
3930                 case CEE_CONV_R8: {
3931                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3932                 }
3933                         break;
3934                 case OP_FCONV_TO_I1:
3935                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, TRUE);
3936                         break;
3937                 case OP_FCONV_TO_U1:
3938                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, FALSE);
3939                         break;
3940                 case OP_FCONV_TO_I2:
3941                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, TRUE);
3942                         break;
3943                 case OP_FCONV_TO_U2:
3944                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, FALSE);
3945                         break;
3946                 case OP_FCONV_TO_I4:
3947                 case OP_FCONV_TO_I:
3948                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, TRUE);
3949                         break;
3950                 case OP_FCONV_TO_U4:
3951                 case OP_FCONV_TO_U:
3952                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, FALSE);
3953                         break;
3954                 case OP_FCONV_TO_I8:
3955                 case OP_FCONV_TO_U8:
3956                         g_assert_not_reached ();
3957                         /* Implemented as helper calls */
3958                         break;
3959                 case OP_LCONV_TO_R_UN:
3960                         g_assert_not_reached ();
3961                         /* Implemented as helper calls */
3962                         break;
3963                 case OP_LCONV_TO_OVF_I: {
3964                         /* Valid ints: 0xffffffff:8000000 to 00000000:0x7f000000 */
3965                         short int *o[5];
3966                         s390_ltr  (code, ins->sreg2, ins->sreg2);
3967                         s390_jnl  (code, 0); CODEPTR(code, o[0]);
3968                         s390_ltr  (code, ins->sreg1, ins->sreg1);
3969                         s390_jnl  (code, 0); CODEPTR(code, o[1]);
3970                         s390_lhi  (code, s390_r13, -1);
3971                         s390_cr   (code, ins->sreg1, s390_r13);
3972                         s390_jnz  (code, 0); CODEPTR(code, o[2]);
3973                         if (ins->dreg != ins->sreg2)
3974                                 s390_lr   (code, ins->dreg, ins->sreg2);
3975                         s390_j    (code, 0); CODEPTR(code, o[3]);
3976                         PTRSLOT(code, o[0]);
3977                         s390_jz   (code, 0); CODEPTR(code, o[4]);
3978                         PTRSLOT(code, o[1]);
3979                         PTRSLOT(code, o[2]);
3980                         mono_add_patch_info (cfg, code - cfg->native_code,
3981                                              MONO_PATCH_INFO_EXC, "OverflowException");
3982                         s390_brasl (code, s390_r14, 0);
3983                         PTRSLOT(code, o[3]);
3984                         PTRSLOT(code, o[4]);
3985                 }
3986                         break;
3987                 case OP_SQRT: {
3988                         s390_sqdbr (code, ins->dreg, ins->sreg1);
3989                 }
3990                         break;
3991                 case OP_FADD: {
3992                         if (ins->dreg == ins->sreg1)
3993                                 s390_adbr (code, ins->dreg, ins->sreg2);
3994                         else {
3995                                 if (ins->dreg == ins->sreg2)
3996                                         s390_adbr (code, ins->dreg, ins->sreg1);
3997                                 else {
3998                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3999                                         s390_adbr (code, ins->dreg, ins->sreg2);
4000                                 }
4001                         }
4002                 }
4003                         break;
4004                 case OP_FSUB: {
4005                         if (ins->dreg == ins->sreg1)
4006                                 s390_sdbr (code, ins->dreg, ins->sreg2);
4007                         else {
4008                                 s390_ldr  (code, ins->dreg, ins->sreg1);
4009                                 s390_sdbr (code, ins->dreg, ins->sreg2);
4010                         }
4011                 }
4012                         break;
4013                 case OP_FMUL: {
4014                         if (ins->dreg == ins->sreg1)
4015                                 s390_mdbr (code, ins->dreg, ins->sreg2);
4016                         else {
4017                                 if (ins->dreg == ins->sreg2)
4018                                         s390_mdbr (code, ins->dreg, ins->sreg1);
4019                                 else {
4020                                         s390_ldr  (code, ins->dreg, ins->sreg1);
4021                                         s390_mdbr (code, ins->dreg, ins->sreg2);
4022                                 }
4023                         }
4024                 }
4025                         break;
4026                 case OP_FDIV: {
4027                         if (ins->dreg == ins->sreg1)
4028                                 s390_ddbr (code, ins->dreg, ins->sreg2);
4029                         else {
4030                                 s390_ldr  (code, ins->dreg, ins->sreg1);
4031                                 s390_ddbr (code, ins->dreg, ins->sreg2);
4032                         }
4033                 }
4034                         break;
4035                 case OP_FNEG: {
4036                         s390_lcdbr (code, ins->dreg, ins->sreg1);
4037                 }
4038                         break;
4039                 case OP_FREM: {
4040                         if (ins->dreg != ins->sreg1) {
4041                                 s390_ldr  (code, ins->dreg, ins->sreg1);
4042                         }
4043                         s390_didbr (code, ins->dreg, ins->sreg2, 5, s390_f15);
4044                 }
4045                         break;
4046                 case OP_FCOMPARE: {
4047                         s390_cdbr (code, ins->sreg1, ins->sreg2);
4048                 }
4049                         break;
4050                 case OP_FCEQ: {
4051                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
4052                         s390_lhi   (code, ins->dreg, 1);
4053                         s390_je    (code, 4);
4054                         s390_lhi   (code, ins->dreg, 0);
4055                 }
4056                         break;
4057                 case OP_FCLT: {
4058                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
4059                         s390_lhi   (code, ins->dreg, 1);
4060                         s390_jl    (code, 4);
4061                         s390_lhi   (code, ins->dreg, 0);
4062                 }
4063                         break;
4064                 case OP_FCLT_UN: {
4065                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
4066                         s390_lhi   (code, ins->dreg, 1);
4067                         s390_jlo   (code, 4);
4068                         s390_lhi   (code, ins->dreg, 0);
4069                 }
4070                         break;
4071                 case OP_FCGT: {
4072                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
4073                         s390_lhi   (code, ins->dreg, 1);
4074                         s390_jh    (code, 4);
4075                         s390_lhi   (code, ins->dreg, 0);
4076                 }
4077                         break;
4078                 case OP_FCGT_UN: {
4079                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
4080                         s390_lhi   (code, ins->dreg, 1);
4081                         s390_jho   (code, 4);
4082                         s390_lhi   (code, ins->dreg, 0);
4083                 }
4084                         break;
4085                 case OP_FBEQ:
4086                         EMIT_COND_BRANCH (ins, S390_CC_EQ|S390_CC_OV);
4087                         break;
4088                 case OP_FBNE_UN:
4089                         EMIT_COND_BRANCH (ins, S390_CC_NE|S390_CC_OV);
4090                         break;
4091                 case OP_FBLT:
4092                         EMIT_COND_BRANCH (ins, S390_CC_LT);
4093                         break;
4094                 case OP_FBLT_UN:
4095                         EMIT_COND_BRANCH (ins, S390_CC_LT|S390_CC_OV);
4096                         break;
4097                 case OP_FBGT:
4098                         EMIT_COND_BRANCH (ins, S390_CC_GT);
4099                         break;
4100                 case OP_FBGT_UN:
4101                         EMIT_COND_BRANCH (ins, S390_CC_GT|S390_CC_OV);
4102                         break;
4103                 case OP_FBGE:
4104                         EMIT_COND_BRANCH (ins, S390_CC_GE);
4105                         break;
4106                 case OP_FBGE_UN:
4107                         EMIT_COND_BRANCH (ins, S390_CC_GE|S390_CC_OV);
4108                         break;
4109                 case OP_FBLE:
4110                         EMIT_COND_BRANCH (ins, S390_CC_LE);
4111                         break;
4112                 case OP_FBLE_UN:
4113                         EMIT_COND_BRANCH (ins, S390_CC_LE|S390_CC_OV);
4114                         break;
4115                 case CEE_CKFINITE: {
4116                         short *o;
4117                         s390_lhi  (code, s390_r13, 0xfc0);
4118                         s390_tcdb (code, ins->sreg1, 0, s390_r13, 0);
4119                         s390_jz   (code, 0); CODEPTR(code, o);
4120                         mono_add_patch_info (cfg, code - cfg->native_code + 2,
4121                                              MONO_PATCH_INFO_EXC, "ArithmeticException");
4122                         s390_brasl (code, s390_r14,0);
4123                         PTRSLOT(code, o);
4124                 }
4125                         break;
4126                 default:
4127                         g_warning ("unknown opcode %s in %s()\n", mono_inst_name (ins->opcode), __FUNCTION__);
4128                         g_assert_not_reached ();
4129                 }
4130
4131                 if ((cfg->opt & MONO_OPT_BRANCH) && ((code - cfg->native_code - offset) > max_len)) {
4132                         g_warning ("wrong maximal instruction length of instruction %s (expected %d, got %d)",
4133                                    mono_inst_name (ins->opcode), max_len, code - cfg->native_code - offset);
4134                         g_assert_not_reached ();
4135                 }
4136
4137                 cpos += max_len;
4138
4139                 last_ins = ins;
4140                 last_offset = offset;
4141
4142                 ins = ins->next;
4143         }
4144
4145         cfg->code_len = code - cfg->native_code;
4146 }
4147
4148 /*========================= End of Function ========================*/
4149
4150 /*------------------------------------------------------------------*/
4151 /*                                                                  */
4152 /* Name         - mono_arch_register_lowlevel_calls                 */
4153 /*                                                                  */
4154 /* Function     - Register routines to help with --trace operation. */
4155 /*                                                                  */
4156 /*------------------------------------------------------------------*/
4157
4158 void
4159 mono_arch_register_lowlevel_calls (void)
4160 {
4161         mono_register_jit_icall (enter_method, "mono_enter_method", NULL, TRUE);
4162         mono_register_jit_icall (leave_method, "mono_leave_method", NULL, TRUE);
4163 }
4164
4165 /*========================= End of Function ========================*/
4166
4167 /*------------------------------------------------------------------*/
4168 /*                                                                  */
4169 /* Name         - mono_arch_patch_code                              */
4170 /*                                                                  */
4171 /* Function     - Process the patch data created during the         */
4172 /*                instruction build process. This resolves jumps,   */
4173 /*                calls, variables etc.                             */
4174 /*                                                                  */
4175 /*------------------------------------------------------------------*/
4176
4177 void
4178 mono_arch_patch_code (MonoMethod *method, MonoDomain *domain, guint8 *code, MonoJumpInfo *ji, gboolean run_cctors)
4179 {
4180         MonoJumpInfo *patch_info;
4181
4182         for (patch_info = ji; patch_info; patch_info = patch_info->next) {
4183                 unsigned char *ip = patch_info->ip.i + code;
4184                 gint32 target = 0;
4185
4186                 switch (patch_info->type) {
4187                 case MONO_PATCH_INFO_BB:
4188                         target = S390_RELATIVE((patch_info->data.bb->native_offset+code),
4189                                                ip);
4190                         ip    += 2;     /* Skip over op-code */
4191                         break;
4192                 case MONO_PATCH_INFO_ABS:
4193                         target = S390_RELATIVE(patch_info->data.target, ip);
4194                         ip    += 2;     /* Skip over op-code */
4195                         break;
4196                 case MONO_PATCH_INFO_LABEL:
4197                         target = S390_RELATIVE((patch_info->data.inst->inst_c0+code),ip);
4198                         ip    += 2;     /* Skip over op-code */
4199                         break;
4200                 case MONO_PATCH_INFO_IP:
4201                         target = ip;
4202                         continue;
4203                 case MONO_PATCH_INFO_METHOD_REL:
4204                         g_assert_not_reached ();
4205                         *((gpointer *)(ip)) = code + patch_info->data.offset;
4206                         continue;
4207                 case MONO_PATCH_INFO_INTERNAL_METHOD: {
4208                         MonoJitICallInfo *mi = mono_find_jit_icall_by_name (patch_info->data.name);
4209                         if (!mi) {
4210                                 g_warning ("unknown MONO_PATCH_INFO_INTERNAL_METHOD %s", patch_info->data.name);
4211                                 g_assert_not_reached ();
4212                         }
4213                         target = S390_RELATIVE(mono_icall_get_wrapper (mi), ip);
4214                         ip    += 2;     /* Skip over op-code */
4215                         break;
4216                 }
4217                 case MONO_PATCH_INFO_METHOD_JUMP:
4218                         g_assert_not_reached ();
4219                         break;
4220                 case MONO_PATCH_INFO_METHOD:
4221                         if (patch_info->data.method == method) {
4222                                 target = S390_RELATIVE(code, ip);
4223                         } else {
4224                                 /* get the trampoline to the method from the domain */
4225                                 target = S390_RELATIVE(mono_arch_create_jit_trampoline (patch_info->data.method), ip);
4226                                 target = mono_arch_create_jit_trampoline(patch_info->data.method);
4227                                 target = S390_RELATIVE(target, ip);
4228                         }
4229                         ip    += 2;     /* Skip over op-code */
4230                         break;
4231                 case MONO_PATCH_INFO_SWITCH: {
4232                         gpointer *table = (gpointer *)patch_info->data.target;
4233                         int i;
4234                         /*------------------------------------------------------*/
4235                         /* ip is pointing at the basr r13,0/j +4 instruction    */
4236                         /* the vtable value follows this (i.e. ip+6)            */
4237                         /*------------------------------------------------------*/
4238                         *((gconstpointer *)(ip+6)) = table;
4239
4240                         for (i = 0; i < patch_info->table_size; i++) {
4241                                 table [i] = (int)patch_info->data.table [i] + code;
4242                         }
4243                         continue;
4244                 }
4245                 case MONO_PATCH_INFO_METHODCONST:
4246                 case MONO_PATCH_INFO_CLASS:
4247                 case MONO_PATCH_INFO_IMAGE:
4248                 case MONO_PATCH_INFO_FIELD:
4249                         target = S390_RELATIVE(patch_info->data.target, ip);
4250                         continue;
4251                 case MONO_PATCH_INFO_R4:
4252                 case MONO_PATCH_INFO_R8:
4253                         g_assert_not_reached ();
4254                         *((gconstpointer *)(ip + 2)) = patch_info->data.target;
4255                         continue;
4256                 case MONO_PATCH_INFO_IID:
4257                         mono_class_init (patch_info->data.klass);
4258                         target = S390_RELATIVE(patch_info->data.klass->interface_id, ip);
4259                         continue;
4260                 case MONO_PATCH_INFO_VTABLE:
4261                         target = S390_RELATIVE(mono_class_vtable (domain, patch_info->data.klass),ip);
4262                         ip += 2;
4263                         continue;
4264                 case MONO_PATCH_INFO_CLASS_INIT:
4265                         target = S390_RELATIVE(mono_create_class_init_trampoline (mono_class_vtable (domain, patch_info->data.klass)), ip);
4266                         ip += 2;
4267                         break;
4268                 case MONO_PATCH_INFO_SFLDA: {
4269                         MonoVTable *vtable = mono_class_vtable (domain, patch_info->data.field->parent);
4270                         if (!vtable->initialized && !(vtable->klass->flags & TYPE_ATTRIBUTE_BEFORE_FIELD_INIT) && mono_class_needs_cctor_run (vtable->klass, method))
4271                                 /* Done by the generated code */
4272                                 ;
4273                         else {
4274                                 if (run_cctors)
4275                                         mono_runtime_class_init (vtable);
4276                         }
4277                         target = S390_RELATIVE((char*)vtable->data + patch_info->data.field->offset, ip);
4278                         ip += 2;
4279                         continue;
4280                 }
4281                 case MONO_PATCH_INFO_EXC_NAME:
4282                         *((gconstpointer *)(ip)) = patch_info->data.name;
4283                         continue;
4284                 case MONO_PATCH_INFO_LDSTR:
4285                         target = mono_ldstr (domain, patch_info->data.token->image,
4286                                              mono_metadata_token_index (patch_info->data.token->token));
4287                         continue;
4288                 case MONO_PATCH_INFO_TYPE_FROM_HANDLE: {
4289                         gpointer handle;
4290                         MonoClass *handle_class;
4291
4292                         handle = mono_ldtoken (patch_info->data.token->image,
4293                                                patch_info->data.token->token,
4294                                                &handle_class, NULL);
4295                         mono_class_init (handle_class);
4296                         mono_class_init (mono_class_from_mono_type (handle));
4297
4298                         target = handle;
4299                         continue;
4300                 }
4301                 case MONO_PATCH_INFO_LDTOKEN: {
4302                         gpointer handle;
4303                         MonoClass *handle_class;
4304
4305                         handle = mono_ldtoken (patch_info->data.token->image,
4306                                                patch_info->data.token->token,
4307                                                &handle_class, NULL);
4308                         mono_class_init (handle_class);
4309
4310                         target = handle;
4311                         continue;
4312                 }
4313                 case MONO_PATCH_INFO_EXC:
4314                         /* everything is dealt with at epilog output time */
4315                         continue;
4316                 default:
4317                         g_assert_not_reached ();
4318                 }
4319                 s390_patch (ip, target);
4320         }
4321 }
4322
4323 /*========================= End of Function ========================*/
4324
4325 /*------------------------------------------------------------------*/
4326 /*                                                                  */
4327 /* Name         - mono_arch_max_epilog_size                         */
4328 /*                                                                  */
4329 /* Function     - Determine the maximum size of the epilog code.    */
4330 /*                                                                  */
4331 /*------------------------------------------------------------------*/
4332
4333 int
4334 mono_arch_max_epilog_size (MonoCompile *cfg)
4335 {
4336         int max_epilog_size = 96;
4337         MonoJumpInfo *patch_info;
4338
4339         if (cfg->method->save_lmf)
4340                 max_epilog_size += 128;
4341
4342         if (mono_jit_trace_calls != NULL)
4343                 max_epilog_size += 128;
4344
4345         if (cfg->prof_options & MONO_PROFILE_ENTER_LEAVE)
4346                 max_epilog_size += 128;
4347
4348         /* count the number of exception infos */
4349
4350         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4351                 if (patch_info->type == MONO_PATCH_INFO_EXC)
4352                         max_epilog_size += 26;
4353         }
4354
4355         return max_epilog_size;
4356 }
4357
4358 /*========================= End of Function ========================*/
4359
4360 /*------------------------------------------------------------------*/
4361 /*                                                                  */
4362 /* Name         - mono_arch_emit_prolog                             */
4363 /*                                                                  */
4364 /* Function     - Create the instruction sequence for a function    */
4365 /*                prolog.                                           */
4366 /*                                                                  */
4367 /*------------------------------------------------------------------*/
4368
4369 guint8 *
4370 mono_arch_emit_prolog (MonoCompile *cfg)
4371 {
4372         MonoMethod *method = cfg->method;
4373         MonoBasicBlock *bb;
4374         MonoMethodSignature *sig;
4375         MonoInst *inst;
4376         int alloc_size, pos, max_offset, i, lmfOffset;
4377         guint8 *code;
4378         CallInfo *cinfo;
4379         size_data sz;
4380         int tracing = 0;
4381
4382         if (mono_jit_trace_calls != NULL && mono_trace_eval (method))
4383                 tracing = 1;
4384
4385         cfg->code_size   = 256;
4386         cfg->native_code = code = g_malloc (cfg->code_size);
4387
4388         s390_stm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4389
4390         if (cfg->flags & MONO_CFG_HAS_ALLOCA) {
4391                 cfg->used_int_regs |= 1 << 11;
4392         }
4393
4394         alloc_size = cfg->stack_offset;
4395 //      if (tracing)
4396 //              alloc_size += S390_TRACE_STACK_SIZE;
4397 //      pos = 0;
4398         /* reserve room to save return value */
4399 //      if (tracing)
4400 //              pos += 8;
4401
4402 //      alloc_size += pos;
4403
4404 //      if (method->save_lmf)
4405 //              alloc_size += sizeof(MonoLMF);
4406
4407 //      alloc_size = S390_ALIGN(alloc_size, S390_STACK_ALIGNMENT);
4408
4409         cfg->stack_usage = alloc_size;
4410         s390_lr   (code, s390_r11, STK_BASE);
4411         if (s390_is_imm16 (-alloc_size)) {
4412                 s390_ahi  (code, STK_BASE, -alloc_size);
4413         } else {
4414                 int stackSize = alloc_size;
4415                 while (stackSize > 32767) {
4416                         s390_ahi  (code, STK_BASE, -32767);
4417                         stackSize -= 32767;
4418                 }
4419                 s390_ahi  (code, STK_BASE, -stackSize);
4420         }
4421         s390_st   (code, s390_r11, 0, STK_BASE, 0);
4422
4423         if (cfg->flags & MONO_CFG_HAS_ALLOCA)
4424                 s390_lr (code, s390_r11, STK_BASE);
4425
4426         /* compute max_offset in order to use short forward jumps
4427          * we always do it on s390 because the immediate displacement
4428          * for jumps is too small
4429          */
4430         max_offset = 0;
4431         for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
4432                 MonoInst *ins = bb->code;
4433                 bb->max_offset = max_offset;
4434
4435                 if (cfg->prof_options & MONO_PROFILE_COVERAGE)
4436                         max_offset += 6;
4437
4438                 while (ins) {
4439                         max_offset += ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
4440                         ins = ins->next;
4441                 }
4442         }
4443
4444         /* load arguments allocated to register from the stack */
4445         sig = method->signature;
4446         pos = 0;
4447
4448         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
4449
4450         if (cinfo->struct_ret) {
4451                 ArgInfo *ainfo = &cinfo->ret;
4452                 inst         = cfg->ret;
4453                 inst->unused = ainfo->vtsize;
4454                 s390_st (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4455         }
4456
4457         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
4458                 ArgInfo *ainfo = cinfo->args + i;
4459                 inst = cfg->varinfo [pos];
4460
4461                 if (inst->opcode == OP_REGVAR) {
4462                         if (ainfo->regtype == RegTypeGeneral)
4463                                 s390_lr (code, inst->dreg, ainfo->reg);
4464                         else if (ainfo->regtype == RegTypeFP) {
4465                                 if (ainfo->size == 4) {
4466                                         s390_ledbr (code, inst->dreg, ainfo->reg);
4467                                 } else {
4468                                         s390_ldr   (code, inst->dreg, ainfo->reg);
4469                                 }
4470                         }
4471                         else if (ainfo->regtype == RegTypeBase) {
4472                                 s390_lr  (code, s390_r13, STK_BASE);
4473                                 s390_ahi (code, s390_r13, alloc_size);
4474                                 s390_l   (code, inst->dreg, 0, s390_r13, ainfo->offset);
4475                         } else
4476                                 g_assert_not_reached ();
4477
4478                         if (cfg->verbose_level > 2)
4479                                 g_print ("Argument %d assigned to register %s\n",
4480                                          pos, mono_arch_regname (inst->dreg));
4481                 } else {
4482                         if (ainfo->regtype == RegTypeGeneral) {
4483                                 if (!((ainfo->reg >= 2) && (ainfo->reg <= 6)))
4484                                         g_assert_not_reached();
4485                                 switch (ainfo->size) {
4486                                 case 1:
4487                                         s390_stc (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4488                                         break;
4489                                 case 2:
4490                                         s390_sth (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4491                                         break;
4492                                 case 8:
4493                                         s390_stm (code, ainfo->reg, ainfo->reg + 1,
4494                                                   inst->inst_basereg, inst->inst_offset);
4495                                         break;
4496                                 default:
4497                                         s390_st  (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4498                                 }
4499                         } else if (ainfo->regtype == RegTypeBase) {
4500                         } else if (ainfo->regtype == RegTypeFP) {
4501                                 if (ainfo->size == 8)
4502                                         s390_std (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4503                                 else if (ainfo->size == 4)
4504                                         s390_ste (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4505                                 else
4506                                         g_assert_not_reached ();
4507                         } else if (ainfo->regtype == RegTypeStructByVal) {
4508                                 int doffset = inst->inst_offset;
4509                                 int reg;
4510                                 if (ainfo->reg != STK_BASE)
4511                                         reg = ainfo->reg;
4512                                 else {
4513                                         reg = s390_r0;
4514                                         s390_lr  (code, s390_r13, STK_BASE);
4515                                         s390_ahi (code, s390_r13, alloc_size);
4516                                 }
4517                                 switch (ainfo->size) {
4518                                         case 1:
4519                                                 if (ainfo->reg == STK_BASE)
4520                                                         s390_ic  (code, reg, 0, s390_r13, ainfo->offset+3);
4521                                                 s390_stc (code, reg, 0, inst->inst_basereg, doffset);
4522                                                 break;
4523                                         case 2:
4524                                                 if (ainfo->reg == STK_BASE)
4525                                                         s390_lh  (code, reg, 0, s390_r13, ainfo->offset+2);
4526                                                 s390_sth (code, reg, 0, inst->inst_basereg, doffset);
4527                                                 break;
4528                                         case 4:
4529                                                 if (ainfo->reg == STK_BASE)
4530                                                         s390_l   (code, reg, 0, s390_r13, ainfo->offset);
4531                                                 s390_st  (code, reg, 0, inst->inst_basereg, doffset);
4532                                                 break;
4533                                         case 8:
4534                                                 if (ainfo->reg == STK_BASE)
4535                                                         s390_lm  (code, s390_r0, s390_r1, s390_r13, ainfo->offset);
4536                                                 s390_stm (code, reg, reg+1, inst->inst_basereg, doffset);
4537                                                 break;
4538                                 }
4539                         } else if (ainfo->regtype == RegTypeStructByAddr) {
4540                                 code = emit_memcpy (code, ainfo->vtsize,
4541                                                     inst->inst_basereg, inst->inst_offset, ainfo->reg, 0);
4542                         } else
4543                                 g_assert_not_reached ();
4544                 }
4545                 pos++;
4546         }
4547
4548         if (method->save_lmf) {
4549                 /*---------------------------------------------------------------*/
4550                 /* Preserve the parameter registers while we fix up the lmf      */
4551                 /*---------------------------------------------------------------*/
4552                 s390_lr (code, s390_r7, s390_r2);
4553                 s390_lr (code, s390_r8, s390_r3);
4554                 s390_lr (code, s390_r9, s390_r4);
4555                 s390_lr (code, s390_r10, s390_r5);
4556
4557                 mono_add_patch_info (cfg, code - cfg->native_code,
4558                                      MONO_PATCH_INFO_INTERNAL_METHOD,
4559                                      (gpointer)"mono_get_lmf_addr");
4560                 /*---------------------------------------------------------------*/
4561                 /* On return from this call r2 have the address of the &lmf      */
4562                 /*---------------------------------------------------------------*/
4563                 s390_brasl (code, s390_r14, 0);
4564
4565                 /*---------------------------------------------------------------*/
4566                 /* we build the MonoLMF structure on the stack - see mini-s390.h */
4567                 /*---------------------------------------------------------------*/
4568                 lmfOffset = alloc_size - sizeof(MonoLMF);
4569
4570                 s390_lr    (code, s390_r13, cfg->frame_reg);
4571                 s390_ahi   (code, s390_r13, lmfOffset);
4572
4573                 /*---------------------------------------------------------------*/
4574                 /* Set lmf.lmf_addr = jit_tls->lmf                               */
4575                 /*---------------------------------------------------------------*/
4576                 s390_st    (code, s390_r2, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4577
4578                 /*---------------------------------------------------------------*/
4579                 /* Get current lmf                                               */
4580                 /*---------------------------------------------------------------*/
4581                 s390_l     (code, s390_r0, 0, s390_r2, 0);
4582
4583                 /*---------------------------------------------------------------*/
4584                 /* Set our lmf as the current lmf                                */
4585                 /*---------------------------------------------------------------*/
4586                 s390_st    (code, s390_r13, 0, s390_r2, 0);
4587
4588                 /*---------------------------------------------------------------*/
4589                 /* Have our lmf.previous_lmf point to the last lmf               */
4590                 /*---------------------------------------------------------------*/
4591                 s390_st    (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4592
4593                 /*---------------------------------------------------------------*/
4594                 /* save method info                                              */
4595                 /*---------------------------------------------------------------*/
4596                 s390_basr  (code, s390_r1, 0);
4597                 s390_j     (code, 4);
4598                 s390_word  (code, method);
4599                 s390_l     (code, s390_r1, 0, s390_r1, 4);
4600                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, method));
4601
4602                 /*---------------------------------------------------------------*/
4603                 /* save the current IP                                           */
4604                 /*---------------------------------------------------------------*/
4605                 s390_lr    (code, s390_r1, cfg->frame_reg);
4606 //              s390_ahi   (code, s390_r1, alloc_size);
4607                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
4608                 s390_l     (code, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
4609                 s390_la    (code, s390_r1, 0, s390_r1, 0);
4610                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
4611
4612                 /*---------------------------------------------------------------*/
4613                 /* Save general and floating point registers                     */
4614                 /*---------------------------------------------------------------*/
4615                 s390_stm   (code, s390_r2, s390_r6, s390_r13, G_STRUCT_OFFSET(MonoLMF, gregs[2]));
4616                 for (i = 0; i < 16; i++) {
4617                         s390_std  (code, i, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, fregs[i]));
4618                 }
4619
4620                 /*---------------------------------------------------------------*/
4621                 /* Restore the parameter registers now that we've set up the lmf */
4622                 /*---------------------------------------------------------------*/
4623                 s390_lr (code, s390_r2, s390_r7);
4624                 s390_lr (code, s390_r3, s390_r8);
4625                 s390_lr (code, s390_r4, s390_r9);
4626                 s390_lr (code, s390_r5, s390_r10);
4627         }
4628
4629         if (tracing)
4630                 code = mono_arch_instrument_prolog (cfg, enter_method, code, TRUE);
4631
4632         cfg->code_len = code - cfg->native_code;
4633         g_free (cinfo);
4634
4635         return code;
4636 }
4637
4638 /*========================= End of Function ========================*/
4639
4640 /*------------------------------------------------------------------*/
4641 /*                                                                  */
4642 /* Name         - mono_arch_emit_epilog                             */
4643 /*                                                                  */
4644 /* Function     - Emit the instructions for a function epilog.      */
4645 /*                                                                  */
4646 /*------------------------------------------------------------------*/
4647
4648 void
4649 mono_arch_emit_epilog (MonoCompile *cfg)
4650 {
4651         MonoJumpInfo *patch_info;
4652         MonoMethod *method = cfg->method;
4653         MonoMethodSignature *sig = method->signature;
4654         MonoInst *inst;
4655         int i, lmfOffset, tracing = 0;
4656         guint8 *code;
4657
4658         code = cfg->native_code + cfg->code_len;
4659
4660         if (mono_jit_trace_calls != NULL && mono_trace_eval (method)) {
4661                 code = mono_arch_instrument_epilog (cfg, leave_method, code, TRUE);
4662                 tracing = 1;
4663         }
4664
4665         if (method->save_lmf) {
4666                 s390_lr  (code, s390_r13, cfg->frame_reg);
4667
4668                 lmfOffset = cfg->stack_usage -  sizeof(MonoLMF);
4669
4670                 /*-------------------------------------------------*/
4671                 /* r13 = my lmf                                    */
4672                 /*-------------------------------------------------*/
4673                 s390_ahi (code, s390_r13, lmfOffset);
4674
4675                 /*-------------------------------------------------*/
4676                 /* r6 = &jit_tls->lmf                              */
4677                 /*-------------------------------------------------*/
4678                 s390_l   (code, s390_r6, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4679
4680                 /*-------------------------------------------------*/
4681                 /* r0 = lmf.previous_lmf                           */
4682                 /*-------------------------------------------------*/
4683                 s390_l   (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4684
4685                 /*-------------------------------------------------*/
4686                 /* jit_tls->lmf = previous_lmf                     */
4687                 /*-------------------------------------------------*/
4688                 s390_l   (code, s390_r13, 0, s390_r6, 0);
4689                 s390_st  (code, s390_r0, 0, s390_r6, 0);
4690         }
4691
4692         if (cfg->frame_reg != STK_BASE)
4693                 s390_lr  (code, STK_BASE, cfg->frame_reg);
4694
4695         s390_ahi (code, STK_BASE, cfg->stack_usage);
4696         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4697         s390_br  (code, s390_r14);
4698
4699         /* add code to raise exceptions */
4700         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4701                 switch (patch_info->type) {
4702                 case MONO_PATCH_INFO_EXC: {
4703                         /*-----------------------------------------------------*/
4704                         /* Patch the branch in epilog to come here             */
4705                         /*-----------------------------------------------------*/
4706                         s390_patch (patch_info->ip.i+cfg->native_code+2,
4707                                     S390_RELATIVE(code,patch_info->ip.i+cfg->native_code));
4708                         /*-----------------------------------------------------*/
4709                         /* Patch the parameter passed to the handler           */
4710                         /*-----------------------------------------------------*/
4711                         s390_basr (code, s390_r13, 0);
4712                         s390_j    (code, 4);
4713                         mono_add_patch_info (cfg, code - cfg->native_code,
4714                                              MONO_PATCH_INFO_EXC_NAME,
4715                                              patch_info->data.target);
4716                         s390_word (code, 0);
4717                         /*-----------------------------------------------------*/
4718                         /* Load the return address and the parameter register  */
4719                         /*-----------------------------------------------------*/
4720                         s390_larl (code, s390_r14, S390_RELATIVE((patch_info->ip.i +
4721                                                    cfg->native_code + 8), code));
4722                         s390_l    (code, s390_r2, 0, s390_r13, 4);
4723                         /*-----------------------------------------------------*/
4724                         /* Reuse the current patch to set the jump             */
4725                         /*-----------------------------------------------------*/
4726                         patch_info->type      = MONO_PATCH_INFO_INTERNAL_METHOD;
4727                         patch_info->data.name = "mono_arch_throw_exception_by_name";
4728                         patch_info->ip.i      = code - cfg->native_code;
4729                         s390_jcl  (code, S390_CC_UN, 0);
4730                         break;
4731                 }
4732                 default:
4733                         /* do nothing */
4734                         break;
4735                 }
4736         }
4737
4738         cfg->code_len = code - cfg->native_code;
4739
4740         g_assert (cfg->code_len < cfg->code_size);
4741
4742 }
4743
4744 /*========================= End of Function ========================*/
4745
4746 /*------------------------------------------------------------------*/
4747 /*                                                                  */
4748 /* Name         - mono_arch_setup_jit_tls_data                      */
4749 /*                                                                  */
4750 /* Function     - Setup the JIT's Thread Level Specific Data.       */
4751 /*                                                                  */
4752 /*------------------------------------------------------------------*/
4753
4754 void
4755 mono_arch_setup_jit_tls_data (MonoJitTlsData *tls)
4756 {
4757 }
4758
4759 /*========================= End of Function ========================*/
4760
4761 /*------------------------------------------------------------------*/
4762 /*                                                                  */
4763 /* Name         - mono_arch_free_jit_tls_data                       */
4764 /*                                                                  */
4765 /* Function     - Free tls data.                                    */
4766 /*                                                                  */
4767 /*------------------------------------------------------------------*/
4768
4769 void
4770 mono_arch_free_jit_tls_data (MonoJitTlsData *tls)
4771 {
4772 }
4773
4774 /*========================= End of Function ========================*/
4775
4776 /*------------------------------------------------------------------*/
4777 /*                                                                  */
4778 /* Name         - mono_arch_emit_this_vret_args                     */
4779 /*                                                                  */
4780 /* Function     -                                                   */
4781 /*                                                                  */
4782 /*------------------------------------------------------------------*/
4783
4784 void
4785 mono_arch_emit_this_vret_args (MonoCompile *cfg, MonoCallInst *inst, int this_reg, int this_type, int vt_reg)
4786 {
4787         int this_dreg = s390_r2;
4788
4789         if (vt_reg != -1)
4790                 this_dreg = s390_r3;
4791
4792         /* add the this argument */
4793         if (this_reg != -1) {
4794                 MonoInst *this;
4795                 MONO_INST_NEW (cfg, this, OP_SETREG);
4796                 this->type = this_type;
4797                 this->sreg1 = this_reg;
4798                 this->dreg = this_dreg;
4799                 mono_bblock_add_inst (cfg->cbb, this);
4800         }
4801
4802         if (vt_reg != -1) {
4803                 MonoInst *vtarg;
4804                 MONO_INST_NEW (cfg, vtarg, OP_SETREG);
4805                 vtarg->type = STACK_MP;
4806                 vtarg->sreg1 = vt_reg;
4807                 vtarg->dreg = s390_r2;
4808                 mono_bblock_add_inst (cfg->cbb, vtarg);
4809         }
4810 }
4811
4812 /*========================= End of Function ========================*/
4813
4814 /*------------------------------------------------------------------*/
4815 /*                                                                  */
4816 /* Name         - mono_arch_get_opcode_for_method                   */
4817 /*                                                                  */
4818 /* Function     - Check for opcodes we can handle directly in       */
4819 /*                hardware.                                         */
4820 /*                                                                  */
4821 /*------------------------------------------------------------------*/
4822
4823 gint
4824 mono_arch_get_opcode_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsig, MonoInst **args)
4825 {
4826         if (cmethod->klass == mono_defaults.math_class) {
4827                 if (strcmp (cmethod->name, "Sqrt") == 0)
4828                         return OP_SQRT;
4829         }
4830         return -1;
4831 }
4832
4833 /*========================= End of Function ========================*/
4834
4835 /*------------------------------------------------------------------*/
4836 /*                                                                  */
4837 /* Name         - mono_arch_print_tree                              */
4838 /*                                                                  */
4839 /* Function     - Print platform-specific opcode details.           */
4840 /*                                                                  */
4841 /* Returns      - 1 - opcode details have been printed              */
4842 /*                0 - opcode details have not been printed          */
4843 /*                                                                  */
4844 /*------------------------------------------------------------------*/
4845
4846 gboolean
4847 mono_arch_print_tree (MonoInst *tree, int arity)
4848 {
4849         gboolean done;
4850
4851         switch (tree->opcode) {
4852                 case OP_S390_LOADARG:
4853                 case OP_S390_ARGPTR:
4854                 case OP_S390_STKARG:
4855                         printf ("[0x%x(%s)]", tree->inst_offset,
4856                                 mono_arch_regname (tree->inst_basereg));
4857                         done = 1;
4858                         break;
4859                 default:
4860                         done = 0;
4861         }
4862         return (done);
4863 }
4864
4865 /*========================= End of Function ========================*/
4866
4867 /*------------------------------------------------------------------*/
4868 /*                                                                  */
4869 /* Name         - mono_arch_regalloc_cost                           */
4870 /*                                                                  */
4871 /* Function     - Determine the cost, in the number of memory       */
4872 /*                references, of the action of allocating the var-  */
4873 /*                iable VMV into a register during global register  */
4874 /*                allocation.                                       */
4875 /*                                                                  */
4876 /* Returns      - Cost                                              */
4877 /*                                                                  */
4878 /*------------------------------------------------------------------*/
4879
4880 guint32
4881 mono_arch_regalloc_cost (MonoCompile *cfg, MonoMethodVar *vmv)
4882 {
4883         /* FIXME: */
4884         return 3;
4885 }
4886
4887 /*========================= End of Function ========================*/