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 if (ins->flags & MONO_INST_BRLABEL) {                                                   \
  26         if (ins->inst_i0->inst_c0) {                                                    \
  27                 int displace;                                                           \
  28                 displace = ((cfg->native_code + ins->inst_i0->inst_c0) - code) / 2;     \
  29                 if (s390_is_uimm16(displace)) {                                         \
  30                         s390_brc (code, cond, displace);                                \
  31                 } else {                                                                \
  32                         s390_jcl (code, cond, displace);                                \
  33                 }                                                                       \
  34         } else {                                                                        \
  35                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  36                                      MONO_PATCH_INFO_LABEL, ins->inst_i0);              \
  37                 s390_jcl (code, cond, 0);                                               \
  38         }                                                                               \
  39 } else {                                                                                \
  40         if (ins->inst_true_bb->native_offset) {                                         \
  41                 int displace;                                                           \
  42                 displace = ((cfg->native_code +                                         \
  43                             ins->inst_true_bb->native_offset) - code) / 2;              \
  44                 if (s390_is_uimm16(displace)) {                                         \
  45                         s390_brc (code, cond, displace);                                \
  46                 } else {                                                                \
  47                         s390_jcl (code, cond, displace);                                \
  48                 }                                                                       \
  49         } else {                                                                        \
  50                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  51                                      MONO_PATCH_INFO_BB, ins->inst_true_bb);            \
  52                 s390_jcl (code, cond, 0);                                               \
  53         }                                                                               \
  54 }
  55
  56 #define EMIT_UNCOND_BRANCH(ins)                                                         \
  57 if (ins->flags & MONO_INST_BRLABEL) {                                                   \
  58         if (ins->inst_i0->inst_c0) {                                                    \
  59                 int displace;                                                           \
  60                 displace = ((cfg->native_code + ins->inst_i0->inst_c0) - code) / 2;     \
  61                 if (s390_is_uimm16(displace)) {                                         \
  62                         s390_brc (code, S390_CC_UN, displace);                          \
  63                 } else {                                                                \
  64                         s390_jcl (code, S390_CC_UN, displace);                          \
  65                 }                                                                       \
  66         } else {                                                                        \
  67                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  68                                      MONO_PATCH_INFO_LABEL, ins->inst_i0);              \
  69                 s390_jcl (code, S390_CC_UN, 0);                                         \
  70         }                                                                               \
  71 } else {                                                                                \
  72         if (ins->inst_target_bb->native_offset) {                                       \
  73                 int displace;                                                           \
  74                 displace = ((cfg->native_code +                                         \
  75                             ins->inst_target_bb->native_offset) - code) / 2;            \
  76                 if (s390_is_uimm16(displace)) {                                         \
  77                         s390_brc (code, S390_CC_UN, displace);                          \
  78                 } else {                                                                \
  79                         s390_jcl (code, S390_CC_UN, displace);                          \
  80                 }                                                                       \
  81         } else {                                                                        \
  82                 mono_add_patch_info (cfg, code - cfg->native_code,                      \
  83                                      MONO_PATCH_INFO_BB, ins->inst_target_bb);          \
  84                 s390_jcl (code, S390_CC_UN, 0);                                         \
  85         }                                                                               \
  86 }
  87
  88 #define EMIT_COND_SYSTEM_EXCEPTION(cond,exc_name)                       \
  89         do {                                                            \
  90                 mono_add_patch_info (cfg, code - cfg->native_code,      \
  91                                     MONO_PATCH_INFO_EXC, exc_name);     \
  92                 s390_jcl (code, cond, 0);                               \
  93         } while (0);
  94
  95 #undef DEBUG
  96 #define DEBUG(a) if (cfg->verbose_level > 1) a
  97 #define reg_is_freeable(r) ((r) >= 3 && (r) <= 10)
  98 #define freg_is_freeable(r) ((r) >= 1 && (r) <= 14)
  99
 100 /*----------------------------------------*/
 101 /* use s390_r3-s390_r10 as temp registers */
 102 /*----------------------------------------*/
 103 #define S390_CALLER_REGS  (0x03f8)
 104
 105 /*----------------------------------------*/
 106 /* use s390_f2-s390_f14 as temp registers */
 107 /*----------------------------------------*/
 108 #define S390_CALLER_FREGS (0x73f8)
 109
 110 #define S390_TRACE_STACK_SIZE (5*sizeof(gint32)+3*sizeof(gdouble))
 111
 112 /*========================= End of Defines =========================*/
 113
 114 /*------------------------------------------------------------------*/
 115 /*                 I n c l u d e s                                  */
 116 /*------------------------------------------------------------------*/
 117
 118 #include "mini.h"
 119 #include <string.h>
 120
 121 #include <mono/metadata/appdomain.h>
 122 #include <mono/metadata/debug-helpers.h>
 123
 124 #include "mini-s390.h"
 125 #include "inssel.h"
 126 #include "cpu-s390.h"
 127
 128 /*========================= End of Includes ========================*/
 129
 130 /*------------------------------------------------------------------*/
 131 /*                 T y p e d e f s                                  */
 132 /*------------------------------------------------------------------*/
 133
 134 typedef struct {
 135         guint stack_size,
 136               local_size,
 137               code_size,
 138               retStruct;
 139 } size_data;
 140
 141 /*------------------------------------------------------------------*/
 142 /* Used by the instrument_emit_epilog                               */
 143 /*------------------------------------------------------------------*/
 144
 145 enum {
 146         SAVE_NONE,
 147         SAVE_STRUCT,
 148         SAVE_ONE,
 149         SAVE_TWO,
 150         SAVE_FP
 151 };
 152
 153 typedef struct {
 154         int born_in;
 155         int killed_in;
 156         int last_use;
 157         int prev_use;
 158 } RegTrack;
 159
 160 typedef struct InstList InstList;
 161
 162 struct InstList {
 163         InstList *prev;
 164         InstList *next;
 165         MonoInst *data;
 166 };
 167
 168 enum {
 169         RegTypeGeneral,
 170         RegTypeBase,
 171         RegTypeFP,
 172         RegTypeStructByVal,
 173         RegTypeStructByAddr
 174 };
 175
 176 typedef struct {
 177         gint32  offset;         /* offset from caller's stack */
 178         gint32  offparm;        /* offset on callee's stack */
 179         guint16 vtsize;         /* in param area */
 180         guint8  reg;
 181         guint8  regtype;        /* See RegType* */
 182         guint32 size;           /* Size of structure used by RegTypeStructByVal */
 183 } ArgInfo;
 184
 185 typedef struct {
 186         int nargs;
 187         guint32 stack_usage;
 188         guint32 struct_ret;
 189         ArgInfo ret;
 190         ArgInfo args [1];
 191 } CallInfo;
 192
 193 typedef struct {
 194         gint32  gr[5];          /* R2-R6                            */
 195         gdouble fp[3];          /* F0-F2                            */
 196 } __attribute__ ((packed)) RegParm;
 197
 198 /*========================= End of Typedefs ========================*/
 199
 200 /*------------------------------------------------------------------*/
 201 /*                   P r o t o t y p e s                            */
 202 /*------------------------------------------------------------------*/
 203
 204 static guint32 *emit_memcpy (guint8 *, int, int, int, int, int);
 205 static void indent (int);
 206 static void decodeParm (MonoType *, void *, int);
 207 static void enter_method (MonoMethod *, RegParm *, char *);
 208 static void leave_method (MonoMethod *, ...);
 209 static gboolean is_regsize_var (MonoType *);
 210 static void add_general (guint *, size_data *, ArgInfo *, gboolean);
 211 static CallInfo * calculate_sizes (MonoMethodSignature *, size_data *, gboolean);
 212 static void peephole_pass (MonoCompile *, MonoBasicBlock *);
 213 static int mono_spillvar_offset (MonoCompile *, int);
 214 static int mono_spillvar_offset_float (MonoCompile *, int);
 215 static void print_ins (int, MonoInst *);
 216 static void print_regtrack (RegTrack *, int);
 217 static InstList * inst_list_prepend (MonoMemPool *, InstList *, MonoInst *);
 218 static int get_register_force_spilling (MonoCompile *, InstList *, MonoInst *, int);
 219 static int get_register_spilling (MonoCompile *, InstList *, MonoInst *, guint32, int);
 220 static int get_float_register_spilling (MonoCompile *, InstList *, MonoInst *, guint32, int);
 221 static MonoInst * create_copy_ins (MonoCompile *, int, int, MonoInst *);
 222 static MonoInst * create_copy_ins_float (MonoCompile *, int, int, MonoInst *);
 223 static MonoInst * create_spilled_store (MonoCompile *, int, int, int, MonoInst *);
 224 static MonoInst * create_spilled_store_float (MonoCompile *, int, int, int, MonoInst *);
 225 static void insert_before_ins (MonoInst *, InstList *, MonoInst *);
 226 static int alloc_int_reg (MonoCompile *, InstList *, MonoInst *, int, guint32);
 227 static guchar * emit_float_to_int (MonoCompile *, guchar *, int, int, int, gboolean);
 228 static unsigned char * mono_emit_stack_alloc (guchar *, MonoInst *);
 229
 230 /*========================= End of Prototypes ======================*/
 231
 232 /*------------------------------------------------------------------*/
 233 /*                 G l o b a l   V a r i a b l e s                  */
 234 /*------------------------------------------------------------------*/
 235
 236 int mono_exc_esp_offset = 0;
 237
 238 static int indent_level = 0;
 239
 240 static const char*const * ins_spec = s390;
 241
 242 /*====================== End of Global Variables ===================*/
 243
 244 /*------------------------------------------------------------------*/
 245 /*                                                                  */
 246 /* Name         - mono_arch_regname                                 */
 247 /*                                                                  */
 248 /* Function     - Returns the name of the register specified by     */
 249 /*                the input parameter.                              */
 250 /*                                                                  */
 251 /*------------------------------------------------------------------*/
 252
 253 const char*
 254 mono_arch_regname (int reg) {
 255         static const char * rnames[] = {
 256                 "s390_r0", "s390_sp", "s390_r2", "s390_r3", "s390_r4",
 257                 "s390_r5", "s390_r6", "s390_r7", "s390_r8", "s390_r9",
 258                 "s390_r10", "s390_r11", "s390_r12", "s390_r13", "s390_r14",
 259                 "s390_r15"
 260         };
 261         if (reg >= 0 && reg < 16)
 262                 return rnames [reg];
 263         return "unknown";
 264 }
 265
 266 /*========================= End of Function ========================*/
 267
 268 /*------------------------------------------------------------------*/
 269 /*                                                                  */
 270 /* Name         - emit_memcpy                                       */
 271 /*                                                                  */
 272 /* Function     - Emit code to move from memory-to-memory based on  */
 273 /*                the size of the variable. r0 is overwritten.      */
 274 /*                                                                  */
 275 /*------------------------------------------------------------------*/
 276
 277 static guint32*
 278 emit_memcpy (guint8 *code, int size, int dreg, int doffset, int sreg, int soffset)
 279 {
 280         switch (size) {
 281                 case 4 :
 282                         s390_l  (code, s390_r0, 0, sreg, soffset);
 283                         s390_st (code, s390_r0, 0, dreg, doffset);
 284                         break;
 285
 286                 case 3 :
 287                         s390_icm  (code, s390_r0, 14, sreg, soffset);
 288                         s390_stcm (code, s390_r0, 14, dreg, doffset);
 289                         break;
 290
 291                 case 2 :
 292                         s390_lh  (code, s390_r0, 0, sreg, soffset);
 293                         s390_sth (code, s390_r0, 0, dreg, doffset);
 294                         break;
 295
 296                 case 1 :
 297                         s390_ic  (code, s390_r0, 0, sreg, soffset);
 298                         s390_stc (code, s390_r0, 0, dreg, doffset);
 299                         break;
 300
 301                 default :
 302                         while (size > 0) {
 303                                 int len;
 304
 305                                 if (size > 256)
 306                                         len = 256;
 307                                 else
 308                                         len = size;
 309                                 s390_mvc (code, len, dreg, doffset, sreg, soffset);
 310                                 size -= len;
 311                         }
 312         }
 313         return code;
 314 }
 315
 316 /*========================= End of Function ========================*/
 317
 318 /*------------------------------------------------------------------*/
 319 /*                                                                  */
 320 /* Name         - arch_get_argument_info                            */
 321 /*                                                                  */
 322 /* Function     - Gathers information on parameters such as size,   */
 323 /*                alignment, and padding. arg_info should be large  */
 324 /*                enough to hold param_count + 1 entries.           */
 325 /*                                                                  */
 326 /* Parameters   - @csig - Method signature                          */
 327 /*                @param_count - No. of parameters to consider      */
 328 /*                @arg_info - An array to store the result info     */
 329 /*                                                                  */
 330 /* Returns      - Size of the activation frame                      */
 331 /*                                                                  */
 332 /*------------------------------------------------------------------*/
 333
 334 int
 335 mono_arch_get_argument_info (MonoMethodSignature *csig,
 336                              int param_count,
 337                              MonoJitArgumentInfo *arg_info)
 338 {
 339         int k, frame_size = 0;
 340         int size, align, pad;
 341         int offset = 8;
 342
 343         if (MONO_TYPE_ISSTRUCT (csig->ret)) {
 344                 frame_size += sizeof (gpointer);
 345                 offset += 4;
 346         }
 347
 348         arg_info [0].offset = offset;
 349
 350         if (csig->hasthis) {
 351                 frame_size += sizeof (gpointer);
 352                 offset += 4;
 353         }
 354
 355         arg_info [0].size = frame_size;
 356
 357         for (k = 0; k < param_count; k++) {
 358
 359                 if (csig->pinvoke)
 360                         size = mono_type_native_stack_size (csig->params [k], &align);
 361                 else
 362                         size = mono_type_stack_size (csig->params [k], &align);
 363
 364                 frame_size += pad = (align - (frame_size & (align - 1))) & (align - 1);
 365                 arg_info [k].pad = pad;
 366                 frame_size += size;
 367                 arg_info [k + 1].pad = 0;
 368                 arg_info [k + 1].size = size;
 369                 offset += pad;
 370                 arg_info [k + 1].offset = offset;
 371                 offset += size;
 372         }
 373
 374         align = MONO_ARCH_FRAME_ALIGNMENT;
 375         frame_size += pad = (align - (frame_size & (align - 1))) & (align - 1);
 376         arg_info [k].pad = pad;
 377
 378         return frame_size;
 379 }
 380
 381 /*========================= End of Function ========================*/
 382
 383 /*------------------------------------------------------------------*/
 384 /*                                                                  */
 385 /* Name         - indent                                            */
 386 /*                                                                  */
 387 /* Function     - Perform nice indenting to current level           */
 388 /*                                                                  */
 389 /*------------------------------------------------------------------*/
 390
 391 static void
 392 indent (int diff) {
 393         int v;
 394         if (diff < 0)
 395                 indent_level += diff;
 396         v = indent_level;
 397         printf("[%3d] ",v);
 398         while (v-- > 0) {
 399                 printf (". ");
 400         }
 401         if (diff > 0)
 402                 indent_level += diff;
 403 }
 404
 405 /*========================= End of Function ========================*/
 406
 407 /*------------------------------------------------------------------*/
 408 /*                                                                  */
 409 /* Name         - decodeParm                                        */
 410 /*                                                                  */
 411 /* Function     - Decode a parameter for the trace.                 */
 412 /*                                                                  */
 413 /*------------------------------------------------------------------*/
 414
 415 static void
 416 decodeParm(MonoType *type, void *curParm, int size)
 417 {
 418         guint32 simpleType;
 419
 420         if (type->byref) {
 421                 printf("[BYREF:%p], ", *((char **) curParm));
 422         } else {
 423                 simpleType = type->type;
 424 enum_parmtype:
 425                 switch (simpleType) {
 426                         case MONO_TYPE_I :
 427                                 printf ("[INTPTR:%p], ", *((int **) curParm));
 428                                 break;
 429                         case MONO_TYPE_U :
 430                                 printf ("[UINTPTR:%p], ", *((int **) curParm));
 431                                 break;
 432                         case MONO_TYPE_BOOLEAN :
 433                                 printf ("[BOOL:%p], ", *((int *) curParm));
 434                                 break;
 435                         case MONO_TYPE_CHAR :
 436                                 printf ("[CHAR:%p], ", *((int *) curParm));
 437                                 break;
 438                         case MONO_TYPE_I1 :
 439                                 printf ("[INT1:%d], ", *((int *) curParm+3));
 440                                 break;
 441                         case MONO_TYPE_I2 :
 442                                 printf ("[INT2:%d], ", *((int *) curParm+2));
 443                                 break;
 444                         case MONO_TYPE_I4 :
 445                                 printf ("[INT4:%d], ", *((int *) curParm));
 446                                 break;
 447                         case MONO_TYPE_U1 :
 448                                 printf ("[UINT1:%ud], ", *((unsigned int *) curParm));
 449                                 break;
 450                         case MONO_TYPE_U2 :
 451                                 printf ("[UINT2:%ud], ", *((unsigned int *) curParm));
 452                                 break;
 453                         case MONO_TYPE_U4 :
 454                                 printf ("[UINT4:%ud], ", *((unsigned int *) curParm));
 455                                 break;
 456                         case MONO_TYPE_STRING : {
 457                                 MonoString *s = *((MonoString **) curParm);
 458                                 if (s) {
 459                                         g_assert (((MonoObject *) s)->vtable->klass == mono_defaults.string_class);
 460                                         printf("[STRING:%p:%s], ", s, mono_string_to_utf8(s));
 461                                 } else {
 462                                         printf("[STRING:null], ");
 463                                 }
 464                                 break;
 465                         }
 466                         case MONO_TYPE_CLASS :
 467                         case MONO_TYPE_OBJECT : {
 468                                 MonoObject *obj = *((MonoObject **) curParm);
 469                                 MonoClass *class;
 470                                 if (obj) {
 471                                         printf("[CLASS/OBJ:");
 472                                         class = obj->vtable->klass;
 473                                         if (class == mono_defaults.string_class) {
 474                                                 printf("[STRING:%p:%s]",
 475                                                        *obj, mono_string_to_utf8 (obj));
 476                                         } else if (class == mono_defaults.int32_class) {
 477                                                 printf("[INT32:%p:%d]",
 478                                                         obj, *(gint32 *)((char *)obj + sizeof (MonoObject)));
 479                                         } else
 480                                                 printf("[%s.%s:%p]",
 481                                                        class->name_space, class->name, obj);
 482                                         printf("], ");
 483                                 } else {
 484                                         printf("[OBJECT:null], ");
 485                                 }
 486                                 break;
 487                         }
 488                         case MONO_TYPE_PTR :
 489                                 printf("[PTR:%p], ", *((gpointer **) (curParm)));
 490                                 break;
 491                         case MONO_TYPE_FNPTR :
 492                                 printf("[FNPTR:%p], ", *((gpointer **) (curParm)));
 493                                 break;
 494                         case MONO_TYPE_ARRAY :
 495                                 printf("[ARRAY:%p], ", *((gpointer **) (curParm)));
 496                                 break;
 497                         case MONO_TYPE_SZARRAY :
 498                                 printf("[SZARRAY:%p], ", *((gpointer **) (curParm)));
 499                                 break;
 500                         case MONO_TYPE_I8 :
 501                                 printf("[INT8:%lld], ", *((gint64 *) (curParm)));
 502                                 break;
 503                         case MONO_TYPE_R4 :
 504                                 printf("[FLOAT4:%f], ", *((float *) (curParm)));
 505                                 break;
 506                         case MONO_TYPE_R8 :
 507                                 printf("[FLOAT8:%g], ", *((double *) (curParm)));
 508                                 break;
 509                         case MONO_TYPE_VALUETYPE : {
 510                                 int i;
 511                                 if (type->data.klass->enumtype) {
 512                                         simpleType = type->data.klass->enum_basetype->type;
 513                                         printf("{VALUETYPE} - ");
 514                                         goto enum_parmtype;
 515                                 }
 516                                 printf("[VALUETYPE:");
 517                                 for (i = 0; i < size; i++)
 518                                         printf("%02x,", *((guint8 *)curParm+i));
 519                                 printf("]");
 520                                 break;
 521                         }
 522                         default :
 523                                 printf("[?? - %d], ",simpleType);
 524                 }
 525         }
 526 }
 527
 528 /*========================= End of Function ========================*/
 529
 530 /*------------------------------------------------------------------*/
 531 /*                                                                  */
 532 /* Name         - enter_method                                      */
 533 /*                                                                  */
 534 /* Function     - Perform tracing of the entry to the current       */
 535 /*                method.                                           */
 536 /*                                                                  */
 537 /*------------------------------------------------------------------*/
 538
 539 static void
 540 enter_method (MonoMethod *method, RegParm *rParm, char *sp)
 541 {
 542         int i, oParm = 0;
 543         MonoClass *class;
 544         MonoObject *obj;
 545         MonoJitArgumentInfo *arg_info;
 546         MonoMethodSignature *sig;
 547         char *fname;
 548         CallInfo *cinfo;
 549         ArgInfo *ainfo;
 550         size_data sz;
 551
 552         fname = mono_method_full_name (method, TRUE);
 553         indent (1);
 554         printf ("ENTER: %s(", fname);
 555         g_free (fname);
 556
 557         printf (") ip: %p\n", __builtin_return_address (1));
 558
 559         if (rParm == NULL)
 560                 return;
 561
 562         sig = method->signature;
 563
 564         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
 565
 566         if (cinfo->struct_ret) {
 567                 printf ("[VALUERET:%p], ", rParm->gr[0]);
 568                 oParm = 1;
 569         }
 570
 571         if (sig->hasthis) {
 572                 gpointer *this = (gpointer *) rParm->gr[oParm];
 573                 obj = (MonoObject *) this;
 574                 if (method->klass->valuetype) {
 575                         if (obj) {
 576                                 printf("this:[value:%p:%08x], ",
 577                                        this, *((guint32 *)(this+sizeof(MonoObject))));
 578                         } else
 579                                 printf ("this:[NULL], ");
 580                 } else {
 581                         if (obj) {
 582                                 class = obj->vtable->klass;
 583                                 if (class == mono_defaults.string_class) {
 584                                         printf ("this:[STRING:%p:%s], ",
 585                                                 obj, mono_string_to_utf8 ((MonoString *)obj));
 586                                 } else {
 587                                         printf ("this:%p[%s.%s], ",
 588                                                 obj, class->name_space, class->name);
 589                                 }
 590                         } else
 591                                 printf ("this:NULL, ");
 592                 }
 593                 oParm++;
 594         }
 595
 596         for (i = 0; i < sig->param_count; ++i) {
 597                 ainfo = cinfo->args + i + oParm;
 598                 switch (ainfo->regtype) {
 599                         case RegTypeGeneral :
 600                                 decodeParm(sig->params[i], &(rParm->gr[ainfo->reg-2]), ainfo->size);
 601                                 break;
 602                         case RegTypeFP :
 603                                 decodeParm(sig->params[i], &(rParm->fp[ainfo->reg]), ainfo->size);
 604                                 break;
 605                         case RegTypeBase :
 606                                 decodeParm(sig->params[i], sp+ainfo->offset, ainfo->size);
 607                                 break;
 608                         case RegTypeStructByVal :
 609                                 if (ainfo->reg != STK_BASE)
 610                                         decodeParm(sig->params[i],
 611                                                    &(rParm->gr[ainfo->reg-2]),
 612                                                    ainfo->size);
 613                                 else
 614                                         switch (ainfo->vtsize) {
 615                                                 case 0:
 616                                                 case 1:
 617                                                 case 2:
 618                                                 case 4:
 619                                                 case 8:
 620                                                         decodeParm(sig->params[i],
 621                                                            sp+ainfo->offset,
 622                                                            ainfo->vtsize);
 623                                                         break;
 624                                                 default:
 625                                                         decodeParm(sig->params[i],
 626                                                            *((char **) (sp+ainfo->offset)),
 627                                                            ainfo->vtsize);
 628                                         }
 629                                 break;
 630                         default :
 631                                 printf("???, ");
 632                 }
 633         }
 634         printf("\n");
 635         g_free(cinfo);
 636 }
 637
 638 /*========================= End of Function ========================*/
 639
 640 /*------------------------------------------------------------------*/
 641 /*                                                                  */
 642 /* Name         - leave_method                                      */
 643 /*                                                                  */
 644 /* Function     -                                                   */
 645 /*                                                                  */
 646 /*------------------------------------------------------------------*/
 647
 648 static void
 649 leave_method (MonoMethod *method, ...)
 650 {
 651         MonoType *type;
 652         char *fname;
 653         va_list ap;
 654
 655         va_start(ap, method);
 656
 657         fname = mono_method_full_name (method, TRUE);
 658         indent (-1);
 659         printf ("LEAVE: %s", fname);
 660         g_free (fname);
 661
 662         type = method->signature->ret;
 663
 664 handle_enum:
 665         switch (type->type) {
 666         case MONO_TYPE_VOID:
 667                 break;
 668         case MONO_TYPE_BOOLEAN: {
 669                 int val = va_arg (ap, int);
 670                 if (val)
 671                         printf ("[TRUE:%d]", val);
 672                 else
 673                         printf ("[FALSE]");
 674
 675                 break;
 676         }
 677         case MONO_TYPE_CHAR: {
 678                 int val = va_arg (ap, int);
 679                 printf ("[CHAR:%d]", val);
 680                 break;
 681         }
 682         case MONO_TYPE_I1: {
 683                 int val = va_arg (ap, int);
 684                 printf ("[INT1:%d]", val);
 685                 break;
 686         }
 687         case MONO_TYPE_U1: {
 688                 int val = va_arg (ap, int);
 689                 printf ("[UINT1:%d]", val);
 690                 break;
 691         }
 692         case MONO_TYPE_I2: {
 693                 int val = va_arg (ap, int);
 694                 printf ("[INT2:%d]", val);
 695                 break;
 696         }
 697         case MONO_TYPE_U2: {
 698                 int val = va_arg (ap, int);
 699                 printf ("[UINT2:%d]", val);
 700                 break;
 701         }
 702         case MONO_TYPE_I4: {
 703                 int val = va_arg (ap, int);
 704                 printf ("[INT4:%d]", val);
 705                 break;
 706         }
 707         case MONO_TYPE_U4: {
 708                 int val = va_arg (ap, int);
 709                 printf ("[UINT4:%d]", val);
 710                 break;
 711         }
 712         case MONO_TYPE_I: {
 713                 int *val = va_arg (ap, int*);
 714                 printf ("[INT:%p]", val);
 715                 printf("]");
 716                 break;
 717         }
 718         case MONO_TYPE_U: {
 719                 int *val = va_arg (ap, int*);
 720                 printf ("[UINT:%p]", val);
 721                 printf("]");
 722                 break;
 723         }
 724         case MONO_TYPE_STRING: {
 725                 MonoString *s = va_arg (ap, MonoString *);
 726 ;
 727                 if (s) {
 728                         g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
 729                         printf ("[STRING:%p:%s]", s, mono_string_to_utf8 (s));
 730                 } else
 731                         printf ("[STRING:null], ");
 732                 break;
 733         }
 734         case MONO_TYPE_CLASS:
 735         case MONO_TYPE_OBJECT: {
 736                 MonoObject *o = va_arg (ap, MonoObject *);
 737
 738                 if (o) {
 739                         if (o->vtable->klass == mono_defaults.boolean_class) {
 740                                 printf ("[BOOLEAN:%p:%d]", o, *((guint8 *)o + sizeof (MonoObject)));
 741                         } else if  (o->vtable->klass == mono_defaults.int32_class) {
 742                                 printf ("[INT32:%p:%d]", o, *((gint32 *)((char *)o + sizeof (MonoObject))));
 743                         } else if  (o->vtable->klass == mono_defaults.int64_class) {
 744                                 printf ("[INT64:%p:%lld]", o, *((gint64 *)((char *)o + sizeof (MonoObject))));
 745                         } else
 746                                 printf ("[%s.%s:%p]", o->vtable->klass->name_space, o->vtable->klass->name, o);
 747                 } else
 748                         printf ("[OBJECT:%p]", o);
 749
 750                 break;
 751         }
 752         case MONO_TYPE_PTR:
 753         case MONO_TYPE_FNPTR:
 754         case MONO_TYPE_ARRAY:
 755         case MONO_TYPE_SZARRAY: {
 756                 gpointer p = va_arg (ap, gpointer);
 757                 printf ("[result=%p]", p);
 758                 break;
 759         }
 760         case MONO_TYPE_I8: {
 761                 gint64 l =  va_arg (ap, gint64);
 762                 printf ("[LONG:%lld]", l);
 763                 break;
 764         }
 765         case MONO_TYPE_R8: {
 766                 double f = va_arg (ap, double);
 767                 printf ("[FP:%g]\n", f);
 768                 break;
 769         }
 770         case MONO_TYPE_VALUETYPE:
 771                 if (type->data.klass->enumtype) {
 772                         type = type->data.klass->enum_basetype;
 773                         goto handle_enum;
 774                 } else {
 775                         guint8 *p = va_arg (ap, gpointer);
 776                         int j, size, align;
 777                         size = mono_type_size (type, &align);
 778                         printf ("[");
 779                         for (j = 0; p && j < size; j++)
 780                                 printf ("%02x,", p [j]);
 781                         printf ("]");
 782                 }
 783                 break;
 784         default:
 785                 printf ("(unknown return type %x)", method->signature->ret->type);
 786         }
 787
 788         printf (" ip: %p\n", __builtin_return_address (0));
 789 }
 790
 791 /*========================= End of Function ========================*/
 792
 793 /*------------------------------------------------------------------*/
 794 /*                                                                  */
 795 /* Name         - mono_arch_cpu_init                                */
 796 /*                                                                  */
 797 /* Function     - Perform CPU specific initialization to execute    */
 798 /*                managed code.                                     */
 799 /*                                                                  */
 800 /*------------------------------------------------------------------*/
 801
 802 void
 803 mono_arch_cpu_init (void)
 804 {
 805 }
 806
 807 /*========================= End of Function ========================*/
 808
 809 /*------------------------------------------------------------------*/
 810 /*                                                                  */
 811 /* Name         - mono_arch_cpu_optimizazions                       */
 812 /*                                                                  */
 813 /* Function     - Returns the optimizations supported on this CPU   */
 814 /*                                                                  */
 815 /*------------------------------------------------------------------*/
 816
 817 guint32
 818 mono_arch_cpu_optimizazions (guint32 *exclude_mask)
 819 {
 820         guint32 opts = 0;
 821
 822         /* no s390-specific optimizations yet */
 823         *exclude_mask = MONO_OPT_INLINE|MONO_OPT_LINEARS;
 824         return opts;
 825 }
 826
 827 /*========================= End of Function ========================*/
 828
 829 /*------------------------------------------------------------------*/
 830 /*                                                                  */
 831 /* Name         -                                                   */
 832 /*                                                                  */
 833 /* Function     -                                                   */
 834 /*                                                                  */
 835 /*------------------------------------------------------------------*/
 836
 837 static gboolean
 838 is_regsize_var (MonoType *t) {
 839         if (t->byref)
 840                 return TRUE;
 841         switch (t->type) {
 842         case MONO_TYPE_I4:
 843         case MONO_TYPE_U4:
 844         case MONO_TYPE_I:
 845         case MONO_TYPE_U:
 846                 return TRUE;
 847         case MONO_TYPE_OBJECT:
 848         case MONO_TYPE_STRING:
 849         case MONO_TYPE_CLASS:
 850         case MONO_TYPE_SZARRAY:
 851         case MONO_TYPE_ARRAY:
 852                 return FALSE;
 853         case MONO_TYPE_VALUETYPE:
 854                 if (t->data.klass->enumtype)
 855                         return is_regsize_var (t->data.klass->enum_basetype);
 856                 return FALSE;
 857         }
 858         return FALSE;
 859 }
 860
 861 /*========================= End of Function ========================*/
 862
 863 /*------------------------------------------------------------------*/
 864 /*                                                                  */
 865 /* Name         - mono_arch_get_allocatable_int_vars                */
 866 /*                                                                  */
 867 /* Function     -                                                   */
 868 /*                                                                  */
 869 /*------------------------------------------------------------------*/
 870
 871 GList *
 872 mono_arch_get_allocatable_int_vars (MonoCompile *cfg)
 873 {
 874         GList *vars = NULL;
 875         int i;
 876
 877         for (i = 0; i < cfg->num_varinfo; i++) {
 878                 MonoInst *ins = cfg->varinfo [i];
 879                 MonoMethodVar *vmv = MONO_VARINFO (cfg, i);
 880
 881                 /* unused vars */
 882                 if (vmv->range.first_use.abs_pos > vmv->range.last_use.abs_pos)
 883                         continue;
 884
 885                 if (ins->flags & (MONO_INST_VOLATILE|MONO_INST_INDIRECT) || (ins->opcode != OP_LOCAL && ins->opcode != OP_ARG))
 886                         continue;
 887
 888                 /* we can only allocate 32 bit values */
 889                 if (is_regsize_var (ins->inst_vtype)) {
 890                         g_assert (MONO_VARINFO (cfg, i)->reg == -1);
 891                         g_assert (i == vmv->idx);
 892                         vars = mono_varlist_insert_sorted (cfg, vars, vmv, FALSE);
 893                 }
 894         }
 895
 896         return vars;
 897 }
 898
 899 /*========================= End of Function ========================*/
 900
 901 /*------------------------------------------------------------------*/
 902 /*                                                                  */
 903 /* Name         - mono_arch_global_int_regs                         */
 904 /*                                                                  */
 905 /* Function     - Return a list of usable integer registers.        */
 906 /*                                                                  */
 907 /*------------------------------------------------------------------*/
 908
 909 GList *
 910 mono_arch_get_global_int_regs (MonoCompile *cfg)
 911 {
 912         GList *regs = NULL;
 913         int i, top = 12;
 914
 915         for (i = 3; i < top; ++i)
 916                 regs = g_list_prepend (regs, GUINT_TO_POINTER (i));
 917
 918         return regs;
 919 }
 920
 921 /*========================= End of Function ========================*/
 922
 923 /*------------------------------------------------------------------*/
 924 /*                                                                  */
 925 /* Name         -  mono_arch_flush_icache                           */
 926 /*                                                                  */
 927 /* Function     -  Flush the CPU icache.                            */
 928 /*                                                                  */
 929 /*------------------------------------------------------------------*/
 930
 931 void
 932 mono_arch_flush_icache (guint8 *code, gint size)
 933 {
 934 }
 935
 936 /*========================= End of Function ========================*/
 937
 938 /*------------------------------------------------------------------*/
 939 /*                                                                  */
 940 /* Name         - add_general                                       */
 941 /*                                                                  */
 942 /* Function     - Determine code and stack size incremements for a  */
 943 /*                parameter.                                        */
 944 /*                                                                  */
 945 /*------------------------------------------------------------------*/
 946
 947 static void inline
 948 add_general (guint *gr, size_data *sz, ArgInfo *ainfo, gboolean simple)
 949 {
 950         if (simple) {
 951                 if (*gr > S390_LAST_ARG_REG) {
 952                         sz->stack_size  = S390_ALIGN(sz->stack_size, sizeof(long));
 953                         ainfo->offset   = sz->stack_size;
 954                         ainfo->reg      = STK_BASE;
 955                         ainfo->regtype  = RegTypeBase;
 956                         sz->stack_size += sizeof(int);
 957                         sz->code_size  += 12;
 958                 } else {
 959                         ainfo->reg     = *gr;
 960                         sz->code_size += 8;
 961                 }
 962         } else {
 963                 if (*gr > S390_LAST_ARG_REG - 1) {
 964                         sz->stack_size  = S390_ALIGN(sz->stack_size, S390_STACK_ALIGNMENT);
 965                         ainfo->offset   = sz->stack_size;
 966                         ainfo->reg      = STK_BASE;
 967                         ainfo->regtype  = RegTypeBase;
 968                         sz->stack_size += sizeof(long long);
 969                         sz->code_size  += 10;
 970                 } else {
 971                         ainfo->reg     = *gr;
 972                         sz->code_size += 8;
 973                 }
 974                 (*gr) ++;
 975         }
 976         (*gr) ++;
 977 }
 978
 979 /*========================= End of Function ========================*/
 980
 981 /*------------------------------------------------------------------*/
 982 /*                                                                  */
 983 /* Name         - calculate_sizes                                   */
 984 /*                                                                  */
 985 /* Function     - Determine the amount of space required for code   */
 986 /*                and stack. In addition determine starting points  */
 987 /*                for stack-based parameters, and area for struct-  */
 988 /*                ures being returned on the stack.                 */
 989 /*                                                                  */
 990 /*------------------------------------------------------------------*/
 991
 992 static CallInfo *
 993 calculate_sizes (MonoMethodSignature *sig, size_data *sz,
 994                  gboolean string_ctor)
 995 {
 996         guint i, fr, gr, size, nWords;
 997         int nParm = sig->hasthis + sig->param_count;
 998         guint32 simpletype, align;
 999         CallInfo *cinfo = g_malloc0 (sizeof (CallInfo) + sizeof (ArgInfo) * nParm);
1000
1001         fr                = 0;
1002         gr                = s390_r2;
1003         cinfo->struct_ret = 0;
1004         sz->retStruct     = 0;
1005         sz->stack_size    = S390_MINIMAL_STACK_SIZE;
1006         sz->code_size     = 0;
1007         sz->local_size    = S390_MINIMAL_STACK_SIZE;
1008
1009         nParm = 0;
1010         /*----------------------------------------------------------*/
1011         /* We determine the size of the return code/stack in case we*/
1012         /* need to reserve a register to be used to address a stack */
1013         /* area that the callee will use.                           */
1014         /*----------------------------------------------------------*/
1015
1016         if (sig->ret->byref || string_ctor) {
1017                 sz->code_size += 8;
1018         } else {
1019                 simpletype = sig->ret->type;
1020 enum_retvalue:
1021                 switch (simpletype) {
1022                 case MONO_TYPE_BOOLEAN:
1023                 case MONO_TYPE_I1:
1024                 case MONO_TYPE_U1:
1025                 case MONO_TYPE_I2:
1026                 case MONO_TYPE_U2:
1027                 case MONO_TYPE_CHAR:
1028                 case MONO_TYPE_I4:
1029                 case MONO_TYPE_U4:
1030                 case MONO_TYPE_I:
1031                 case MONO_TYPE_U:
1032                 case MONO_TYPE_CLASS:
1033                 case MONO_TYPE_OBJECT:
1034                 case MONO_TYPE_SZARRAY:
1035                 case MONO_TYPE_ARRAY:
1036                 case MONO_TYPE_PTR:
1037                 case MONO_TYPE_STRING:
1038                         cinfo->ret.reg = s390_r2;
1039                         sz->code_size += 4;
1040                         break;
1041                 case MONO_TYPE_R4:
1042                 case MONO_TYPE_R8:
1043                         cinfo->ret.reg = s390_f0;
1044                         sz->code_size += 4;
1045                         break;
1046                 case MONO_TYPE_I8:
1047                 case MONO_TYPE_U8:
1048                         cinfo->ret.reg = s390_r2;
1049                         sz->code_size += 4;
1050                         break;
1051                 case MONO_TYPE_VALUETYPE:
1052                         if (sig->ret->data.klass->enumtype) {
1053                                 simpletype = sig->ret->data.klass->enum_basetype->type;
1054                                 goto enum_retvalue;
1055                         }
1056                         if (sig->pinvoke)
1057                                 size = mono_class_native_size (sig->ret->data.klass, &align);
1058                         else
1059                                 size = mono_class_value_size (sig->ret->data.klass, &align);
1060                         cinfo->ret.reg    = s390_r2;
1061                         cinfo->struct_ret = 1;
1062                         cinfo->ret.size   = size;
1063                         cinfo->ret.vtsize = size;
1064                         cinfo->ret.offset = sz->stack_size;
1065                         sz->stack_size   += S390_ALIGN(size, align);
1066                         gr++;
1067                         break;
1068                 case MONO_TYPE_VOID:
1069                         break;
1070                 default:
1071                         g_error ("Can't handle as return value 0x%x", sig->ret->type);
1072                 }
1073         }
1074
1075         if (sig->hasthis) {
1076                 add_general (&gr, sz, cinfo->args+nParm, TRUE);
1077                 cinfo->args[nParm].size = sizeof(gpointer);
1078                 nParm++;
1079         }
1080
1081         /*----------------------------------------------------------*/
1082         /* We determine the size of the parameter code and stack    */
1083         /* requirements by checking the types and sizes of the      */
1084         /* parameters.                                              */
1085         /*----------------------------------------------------------*/
1086
1087         for (i = 0; i < sig->param_count; ++i) {
1088                 if (sig->params [i]->byref) {
1089                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1090                         cinfo->args[nParm].size = sizeof(gpointer);
1091                         nParm++;
1092                         continue;
1093                 }
1094                 simpletype = sig->params [i]->type;
1095         enum_calc_size:
1096                 switch (simpletype) {
1097                 case MONO_TYPE_BOOLEAN:
1098                 case MONO_TYPE_I1:
1099                 case MONO_TYPE_U1:
1100                         cinfo->args[nParm].size = sizeof(char);
1101                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1102                         nParm++;
1103                         break;
1104                 case MONO_TYPE_I2:
1105                 case MONO_TYPE_U2:
1106                 case MONO_TYPE_CHAR:
1107                         cinfo->args[nParm].size = sizeof(short);
1108                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1109                         nParm++;
1110                         break;
1111                 case MONO_TYPE_I4:
1112                 case MONO_TYPE_U4:
1113                         cinfo->args[nParm].size = sizeof(int);
1114                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1115                         nParm++;
1116                         break;
1117                 case MONO_TYPE_I:
1118                 case MONO_TYPE_U:
1119                 case MONO_TYPE_PTR:
1120                 case MONO_TYPE_CLASS:
1121                 case MONO_TYPE_OBJECT:
1122                 case MONO_TYPE_STRING:
1123                 case MONO_TYPE_SZARRAY:
1124                 case MONO_TYPE_ARRAY:
1125                         cinfo->args[nParm].size = sizeof(gpointer);
1126                         add_general (&gr, sz, cinfo->args+nParm, TRUE);
1127                         nParm++;
1128                         break;
1129                 case MONO_TYPE_VALUETYPE:
1130                         if (sig->params [i]->data.klass->enumtype) {
1131                                 simpletype = sig->params [i]->data.klass->enum_basetype->type;
1132                                 goto enum_calc_size;
1133                         }
1134                         if (sig->pinvoke)
1135                                 size = mono_class_native_size (sig->params [i]->data.klass, &align);
1136                         else
1137                                 size = mono_class_value_size (sig->params [i]->data.klass, &align);
1138                         nWords = (size + sizeof(gpointer) - 1) /
1139                                  sizeof(gpointer);
1140
1141                         cinfo->args[nParm].vtsize  = 0;
1142                         cinfo->args[nParm].size    = 0;
1143                         cinfo->args[nParm].offparm = sz->local_size;
1144
1145                         switch (size) {
1146                                 /*----------------------------------*/
1147                                 /* On S/390, structures of size 1,  */
1148                                 /* 2, 4, and 8 bytes are passed in  */
1149                                 /* (a) register(s).                 */
1150                                 /*----------------------------------*/
1151                                 case 0:
1152                                 case 1:
1153                                 case 2:
1154                                 case 4:
1155                                         add_general(&gr, sz, cinfo->args+nParm, TRUE);
1156                                         cinfo->args[nParm].size   = sizeof(int);
1157                                         cinfo->args[nParm].regtype = RegTypeStructByVal;
1158                                         nParm++;
1159                                         break;
1160                                 case 8:
1161                                         add_general(&gr, sz, cinfo->args+nParm, FALSE);
1162                                         cinfo->args[nParm].size = sizeof(long long);
1163                                         cinfo->args[nParm].regtype = RegTypeStructByVal;
1164                                         nParm++;
1165                                         break;
1166                                 default:
1167                                         add_general(&gr, sz, cinfo->args+nParm, TRUE);
1168                                         cinfo->args[nParm].size    = sizeof(int);
1169                                         cinfo->args[nParm].regtype = RegTypeStructByVal;
1170                                         cinfo->args[nParm].vtsize  = size;
1171                                         sz->code_size  += 40;
1172                                         nParm++;
1173                         }
1174                         sz->local_size += sizeof(long);
1175                         break;
1176                 case MONO_TYPE_I8:
1177                 case MONO_TYPE_U8:
1178                         cinfo->args[nParm].size = sizeof(long long);
1179                         add_general (&gr, sz, cinfo->args+nParm, FALSE);
1180                         nParm++;
1181                         break;
1182                 case MONO_TYPE_R4:
1183                         cinfo->args[nParm].size = sizeof(float);
1184                         if (fr <= S390_LAST_FPARG_REG) {
1185                                 cinfo->args[nParm].regtype = RegTypeFP;
1186                                 cinfo->args[nParm].reg     = fr;
1187                                 sz->code_size += 4;
1188                                 fr += 2;
1189                         }
1190                         else {
1191                                 cinfo->args[nParm].offset  = sz->stack_size;
1192                                 cinfo->args[nParm].reg     = STK_BASE;
1193                                 cinfo->args[nParm].regtype = RegTypeBase;
1194                                 sz->code_size  += 4;
1195                                 sz->stack_size += 4;
1196                         }
1197                         nParm++;
1198                         break;
1199                 case MONO_TYPE_R8:
1200                         cinfo->args[nParm].size = sizeof(double);
1201                         if (fr <= S390_LAST_FPARG_REG) {
1202                                 cinfo->args[nParm].regtype = RegTypeFP;
1203                                 cinfo->args[nParm].reg     = fr;
1204                                 sz->code_size += 4;
1205                                 fr += 2;
1206                         } else {
1207                                 sz->stack_size  = S390_ALIGN(sz->stack_size,
1208                                                              S390_STACK_ALIGNMENT);
1209                                 cinfo->args[nParm].offset  = sz->stack_size;
1210                                 cinfo->args[nParm].reg     = STK_BASE;
1211                                 cinfo->args[nParm].regtype = RegTypeBase;
1212                                 sz->code_size  += 4;
1213                                 sz->stack_size += 8;
1214                         }
1215                         nParm++;
1216                         break;
1217                 default:
1218                         g_error ("Can't trampoline 0x%x", sig->params [i]->type);
1219                 }
1220         }
1221
1222
1223         /* align stack size */
1224         sz->stack_size = S390_ALIGN(sz->stack_size, S390_STACK_ALIGNMENT);
1225         cinfo->stack_usage = sz->stack_size;
1226         return (cinfo);
1227 }
1228
1229 /*========================= End of Function ========================*/
1230
1231 /*------------------------------------------------------------------*/
1232 /*                                                                  */
1233 /* Name         - mono_arch_allocate_vars                           */
1234 /*                                                                  */
1235 /* Function     - Set var information according to the calling      */
1236 /*                convention for S/390. The local var stuff should  */
1237 /*                most likely be split in another method.           */
1238 /*                                                                  */
1239 /* Parameter    - @m - Compile unit.                                */
1240 /*                                                                  */
1241 /*------------------------------------------------------------------*/
1242
1243 void
1244 mono_arch_allocate_vars (MonoCompile *m)
1245 {
1246         MonoMethodSignature *sig;
1247         MonoMethodHeader *header;
1248         MonoInst *inst;
1249         CallInfo *cinfo;
1250         size_data sz;
1251         int iParm, iVar, offset, size, align, curinst;
1252         int frame_reg = STK_BASE;
1253         int sArg, eArg;
1254
1255         header  = ((MonoMethodNormal *)m->method)->header;
1256
1257         /*
1258          * We use the frame register also for any method that has
1259          * filter clauses. This way, when the handlers are called,
1260          * the code will reference local variables using the frame reg instead of
1261          * the stack pointer: if we had to restore the stack pointer, we'd
1262          * corrupt the method frames that are already on the stack (since
1263          * filters get called before stack unwinding happens) when the filter
1264          * code would call any method.
1265          */
1266 //      if ((m->flags & MONO_CFG_HAS_ALLOCA) || header->num_clauses)
1267         if (m->flags & MONO_CFG_HAS_ALLOCA)
1268                 frame_reg = s390_r11;
1269
1270         m->frame_reg = frame_reg;
1271
1272         if (frame_reg != STK_BASE)
1273                 m->used_int_regs |= 1 << frame_reg;
1274
1275         sig     = m->method->signature;
1276
1277         cinfo   = calculate_sizes (sig, &sz, sig->pinvoke);
1278
1279         if (cinfo->struct_ret) {
1280                 m->ret->opcode = OP_REGVAR;
1281                 m->ret->inst_c0 = s390_r2;
1282         } else {
1283                 /* FIXME: handle long and FP values */
1284                 switch (sig->ret->type) {
1285                 case MONO_TYPE_VOID:
1286                         break;
1287                 default:
1288                         m->ret->opcode = OP_REGVAR;
1289                         m->ret->dreg    = s390_r2;
1290                         break;
1291                 }
1292         }
1293
1294         /*--------------------------------------------------------------*/
1295         /* local vars are at a positive offset from the stack pointer   */
1296         /*                                                              */
1297         /* also note that if the function uses alloca, we use s390_r11  */
1298         /* to point at the local variables.                             */
1299         /* add parameter area size for called functions                 */
1300         /*--------------------------------------------------------------*/
1301         offset = (m->param_area + S390_MINIMAL_STACK_SIZE);
1302
1303         if (cinfo->struct_ret) {
1304                 inst               = m->ret;
1305                 offset             = S390_ALIGN(offset, sizeof(gpointer));
1306                 inst->inst_offset  = offset;
1307                 inst->opcode       = OP_REGOFFSET;
1308                 inst->inst_basereg = frame_reg;
1309                 offset            += sizeof(gpointer);
1310         }
1311
1312         if (sig->hasthis) {
1313                 inst = m->varinfo [0];
1314                 if (inst->opcode != OP_REGVAR) {
1315                         inst->opcode       = OP_REGOFFSET;
1316                         inst->inst_basereg = frame_reg;
1317                         offset             = S390_ALIGN(offset, sizeof(gpointer));
1318                         inst->inst_offset  = offset;
1319                         offset            += sizeof (gpointer);
1320                 }
1321         }
1322
1323         curinst = m->locals_start;
1324         for (iVar = curinst; iVar < m->num_varinfo; ++iVar) {
1325                 inst = m->varinfo [iVar];
1326                 if (inst->opcode == OP_REGVAR)
1327                         continue;
1328
1329                 /* inst->unused indicates native sized value types, this is used by the
1330                 * pinvoke wrappers when they call functions returning structure */
1331                 if (inst->unused && MONO_TYPE_ISSTRUCT (inst->inst_vtype))
1332                         size = mono_class_native_size (inst->inst_vtype->data.klass, &align);
1333                 else
1334                         size = mono_type_size (inst->inst_vtype, &align);
1335
1336                 offset             = S390_ALIGN(offset, align);
1337                 inst->inst_offset  = offset;
1338                 inst->opcode       = OP_REGOFFSET;
1339                 inst->inst_basereg = frame_reg;
1340                 offset            += size;
1341                 //DEBUG (g_print("allocating local %d to %d\n", iVar, inst->inst_offset));
1342         }
1343
1344         if (sig->hasthis)
1345                 curinst = sArg = 1;
1346         else
1347                 curinst = sArg = 0;
1348
1349         eArg = sig->param_count + sArg;
1350
1351         for (iParm = sArg; iParm < eArg; ++iParm) {
1352                 inst = m->varinfo [curinst];
1353                 if (inst->opcode != OP_REGVAR) {
1354                         if (cinfo->args[iParm].regtype == RegTypeStructByVal) {
1355                                 if (cinfo->args[iParm].vtsize != 0) {
1356                                         inst->opcode       = OP_S390_LOADARG;
1357                                         inst->inst_basereg = frame_reg;
1358                                         size               = sizeof(long);
1359                                         offset             = S390_ALIGN(offset, size);
1360                                         inst->inst_offset  = offset;
1361                                 } else {
1362                                         inst->opcode       = OP_S390_ARGPTR;
1363                                         inst->inst_basereg = frame_reg;
1364                                         size               = cinfo->args[iParm].size;
1365                                         offset             = S390_ALIGN(offset, size);
1366                                         inst->inst_offset  = offset;
1367                                 }
1368                         } else {
1369                                 if (cinfo->args[iParm].reg != STK_BASE) {
1370                                         inst->opcode       = OP_REGOFFSET;
1371                                         inst->inst_basereg = frame_reg;
1372                                         size               = (cinfo->args[iParm].size < 8
1373                                                               ? sizeof(long)
1374                                                               : sizeof(long long));
1375                                         offset             = S390_ALIGN(offset, size);
1376                                         inst->inst_offset  = offset;
1377                                 } else {
1378                                         inst->opcode       = OP_S390_STKARG;
1379                                         inst->inst_basereg = frame_reg;
1380                                         size               = (cinfo->args[iParm].size < 4
1381                                                               ? 4 - cinfo->args[iParm].size
1382                                                               : 0);
1383                                         inst->inst_offset  = cinfo->args[iParm].offset +
1384                                                              size;
1385 //                                      inst->unused       = stackOffset;
1386                                         inst->unused       = 0;
1387                                         size               = sizeof(long);
1388                                 }
1389                         }
1390                         offset += size;
1391                 }
1392                 curinst++;
1393         }
1394
1395         /*------------------------------------------------------*/
1396         /* Allow space for the trace method stack area if needed*/
1397         /*------------------------------------------------------*/
1398         if (mono_jit_trace_calls != NULL && mono_trace_eval (m))
1399                 offset += S390_TRACE_STACK_SIZE;
1400
1401         /*------------------------------------------------------*/
1402         /* Reserve space to save LMF and caller saved registers */
1403         /*------------------------------------------------------*/
1404         if (m->method->save_lmf)
1405                 offset += sizeof (MonoLMF);
1406
1407         /*------------------------------------------------------*/
1408         /* align the offset                                     */
1409         /*------------------------------------------------------*/
1410         m->stack_offset = S390_ALIGN(offset, S390_STACK_ALIGNMENT);
1411
1412 }
1413
1414 /*========================= End of Function ========================*/
1415
1416 /*------------------------------------------------------------------*/
1417 /*                                                                  */
1418 /* Name         - mono_arch_call_opcode                             */
1419 /*                                                                  */
1420 /* Function     - Take the arguments and generate the arch-specific */
1421 /*                instructions to properly call the function. This  */
1422 /*                includes pushing, moving argments to the correct  */
1423 /*                etc.                                              */
1424 /*                                                                  */
1425 /* Note         - FIXME: We need an alignment solution for          */
1426 /*                enter_method and mono_arch_call_opcode, currently */
1427 /*                alignment in mono_arch_call_opcode is computed    */
1428 /*                without arch_get_argument_info.                   */
1429 /*                                                                  */
1430 /*------------------------------------------------------------------*/
1431
1432 MonoCallInst*
1433 mono_arch_call_opcode (MonoCompile *cfg, MonoBasicBlock* bb, MonoCallInst *call, int is_virtual) {
1434         MonoInst *arg, *in;
1435         MonoMethodSignature *sig;
1436         int i, n, lParamArea;
1437         CallInfo *cinfo;
1438         ArgInfo *ainfo;
1439         size_data sz;
1440
1441         sig = call->signature;
1442         n = sig->param_count + sig->hasthis;
1443
1444         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
1445         if (cinfo->struct_ret)
1446                 call->used_iregs |= 1 << cinfo->struct_ret;
1447
1448         for (i = 0; i < n; ++i) {
1449                 ainfo = cinfo->args + i;
1450                 if (is_virtual && i == 0) {
1451                         /* the argument will be attached to the call instrucion */
1452                         in = call->args [i];
1453                         call->used_iregs |= 1 << ainfo->reg;
1454                 } else {
1455                         MONO_INST_NEW (cfg, arg, OP_OUTARG);
1456                         in = call->args [i];
1457                         arg->cil_code  = in->cil_code;
1458                         arg->inst_left = in;
1459                         arg->type      = in->type;
1460                         /* prepend, we'll need to reverse them later */
1461                         arg->next      = call->out_args;
1462                         call->out_args = arg;
1463                         if (ainfo->regtype == RegTypeGeneral) {
1464                                 arg->unused = ainfo->reg;
1465                                 call->used_iregs |= 1 << ainfo->reg;
1466                                 if (arg->type == STACK_I8)
1467                                         call->used_iregs |= 1 << (ainfo->reg + 1);
1468                         } else if (ainfo->regtype == RegTypeStructByAddr) {
1469                                 arg->unused = ainfo->reg;
1470                                 call->used_iregs |= 1 << ainfo->reg;
1471                         } else if (ainfo->regtype == RegTypeStructByVal) {
1472                                 if (ainfo->reg != STK_BASE) {
1473                                         switch (ainfo->size) {
1474                                         case 0:
1475                                         case 1:
1476                                         case 2:
1477                                         case 4:
1478                                                 call->used_iregs |= 1 << ainfo->reg;
1479                                                 break;
1480                                         case 8:
1481                                                 call->used_iregs |= 1 << ainfo->reg;
1482                                                 call->used_iregs |= 1 << (ainfo->reg+1);
1483                                                 break;
1484                                         }
1485                                 }
1486                                 arg->sreg2    = ainfo->reg;
1487                                 arg->opcode   = OP_OUTARG_VT;
1488                                 if (ainfo->vtsize != 0)
1489                                         arg->unused = -ainfo->vtsize;
1490                                 else
1491                                         arg->unused = ainfo->size;
1492                                 arg->inst_imm     = ainfo->offset;
1493                                 arg->sreg1        = ainfo->offparm;
1494                         } else if (ainfo->regtype == RegTypeBase) {
1495                                 arg->opcode = OP_OUTARG;
1496                                 arg->unused = ainfo->reg | (ainfo->size << 8);
1497                                 arg->inst_imm = ainfo->offset;
1498                         } else if (ainfo->regtype == RegTypeFP) {
1499                                 arg->opcode = OP_OUTARG_R8;
1500                                 arg->unused = ainfo->reg;
1501                                 call->used_fregs |= 1 << ainfo->reg;
1502                                 if (ainfo->size == 4) {
1503                                         /* we reduce the precision */
1504                                         MonoInst *conv;
1505                                         MONO_INST_NEW (cfg, conv, OP_FCONV_TO_R4);
1506                                         conv->inst_left = arg->inst_left;
1507                                         arg->inst_left = conv;
1508                                 }
1509                         } else {
1510                                 g_assert_not_reached ();
1511                         }
1512                 }
1513         }
1514         /*
1515          * Reverse the call->out_args list.
1516          */
1517         {
1518                 MonoInst *prev = NULL, *list = call->out_args, *next;
1519                 while (list) {
1520                         next = list->next;
1521                         list->next = prev;
1522                         prev = list;
1523                         list = next;
1524                 }
1525                 call->out_args = prev;
1526         }
1527         call->stack_usage = cinfo->stack_usage;
1528
1529         lParamArea        = cinfo->stack_usage - S390_MINIMAL_STACK_SIZE;
1530         cfg->param_area   = MAX (cfg->param_area, lParamArea);
1531         cfg->flags       |= MONO_CFG_HAS_CALLS;
1532         /*----------------------------------------------------------*/
1533         /* should set more info in call, such as the stack space    */
1534         /* used by the args that needs to be added back to esp      */
1535         /*----------------------------------------------------------*/
1536
1537         g_free (cinfo);
1538         return call;
1539 }
1540
1541 /*========================= End of Function ========================*/
1542
1543 /*------------------------------------------------------------------*/
1544 /*                                                                  */
1545 /* Name         - mono_arch_instrument_mem_needs                    */
1546 /*                                                                  */
1547 /* Function     - Allow tracing to work with this interface (with   */
1548 /*                an optional argument).                            */
1549 /*                                                                  */
1550 /*------------------------------------------------------------------*/
1551
1552 void
1553 mono_arch_instrument_mem_needs (MonoMethod *method, int *stack, int *code)
1554 {
1555         /* no stack room needed now (may be needed for FASTCALL-trace support) */
1556         *stack = 0;
1557         /* split prolog-epilog requirements? */
1558         *code = 50; /* max bytes needed: check this number */
1559 }
1560
1561 /*========================= End of Function ========================*/
1562
1563 /*------------------------------------------------------------------*/
1564 /*                                                                  */
1565 /* Name         - mono_arch_instrument_prolog                       */
1566 /*                                                                  */
1567 /* Function     - Create an "instrumented" prolog.                  */
1568 /*                                                                  */
1569 /*------------------------------------------------------------------*/
1570
1571 void*
1572 mono_arch_instrument_prolog (MonoCompile *cfg, void *func, void *p,
1573                              gboolean enable_arguments)
1574 {
1575         guchar *code = p;
1576         int     parmOffset,
1577                 fpOffset;
1578
1579         parmOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1580         if (cfg->method->save_lmf)
1581                 parmOffset -= sizeof(MonoLMF);
1582         fpOffset   = parmOffset + (5*sizeof(gint32));
1583
1584         s390_stm  (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1585         s390_std  (code, s390_f0, 0, STK_BASE, fpOffset);
1586         s390_std  (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1587         s390_std  (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1588         s390_basr (code, s390_r13, 0);
1589         s390_j    (code, 6);
1590         s390_word (code, cfg->method);
1591         s390_word (code, func);
1592         s390_l    (code, s390_r2, 0, s390_r13, 4);
1593         s390_la   (code, s390_r3, 0, STK_BASE, parmOffset);
1594         s390_lr   (code, s390_r4, STK_BASE);
1595         s390_ahi  (code, s390_r4, cfg->stack_usage);
1596         s390_l    (code, s390_r1, 0, s390_r13, 8);
1597         s390_basr (code, s390_r14, s390_r1);
1598         s390_ld   (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1599         s390_ld   (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1600         s390_ld   (code, s390_f0, 0, STK_BASE, fpOffset);
1601         s390_lm   (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1602
1603         return code;
1604 }
1605
1606 /*========================= End of Function ========================*/
1607
1608 /*------------------------------------------------------------------*/
1609 /*                                                                  */
1610 /* Name         - mono_arch_instrument_epilog                       */
1611 /*                                                                  */
1612 /* Function     - Create an epilog that will handle the returned    */
1613 /*                values used in instrumentation.                   */
1614 /*                                                                  */
1615 /*------------------------------------------------------------------*/
1616
1617 void*
1618 mono_arch_instrument_epilog (MonoCompile *cfg, void *func, void *p, gboolean enable_arguments)
1619 {
1620         guchar     *code = p;
1621         int        save_mode = SAVE_NONE,
1622                    saveOffset;
1623         MonoMethod *method = cfg->method;
1624         int        rtype = method->signature->ret->type;
1625
1626         saveOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1627         if (method->save_lmf)
1628                 saveOffset -= sizeof(MonoLMF);
1629
1630 handle_enum:
1631         switch (rtype) {
1632         case MONO_TYPE_VOID:
1633                 /* special case string .ctor icall */
1634                 if (strcmp (".ctor", method->name) && method->klass == mono_defaults.string_class)
1635                         save_mode = SAVE_ONE;
1636                 else
1637                         save_mode = SAVE_NONE;
1638                 break;
1639         case MONO_TYPE_I8:
1640         case MONO_TYPE_U8:
1641                 save_mode = SAVE_TWO;
1642                 break;
1643         case MONO_TYPE_R4:
1644         case MONO_TYPE_R8:
1645                 save_mode = SAVE_FP;
1646                 break;
1647         case MONO_TYPE_VALUETYPE:
1648                 if (method->signature->ret->data.klass->enumtype) {
1649                         rtype = method->signature->ret->data.klass->enum_basetype->type;
1650                         goto handle_enum;
1651                 }
1652                 save_mode = SAVE_STRUCT;
1653                 break;
1654         default:
1655                 save_mode = SAVE_ONE;
1656                 break;
1657         }
1658
1659         switch (save_mode) {
1660         case SAVE_TWO:
1661                 s390_stm (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1662                 if (enable_arguments) {
1663                         s390_lr (code, s390_r4, s390_r3);
1664                         s390_lr (code, s390_r3, s390_r2);
1665                 }
1666                 break;
1667         case SAVE_ONE:
1668                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1669                 if (enable_arguments) {
1670                         s390_lr (code, s390_r3, s390_r2);
1671                 }
1672                 break;
1673         case SAVE_FP:
1674                 s390_std (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1675                 if (enable_arguments) {
1676                         /* FIXME: what reg?  */
1677                         s390_ldr (code, s390_f2, s390_f0);
1678                         s390_lm  (code, s390_r3, s390_r4, cfg->frame_reg, saveOffset);
1679                 }
1680                 break;
1681         case SAVE_STRUCT:
1682                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1683                 if (enable_arguments) {
1684                         s390_l (code, s390_r3, 0, cfg->frame_reg,
1685                                 S390_MINIMAL_STACK_SIZE+cfg->param_area);
1686                 }
1687                 break;
1688         case SAVE_NONE:
1689         default:
1690                 break;
1691         }
1692
1693         s390_basr (code, s390_r13, 0);
1694         s390_j    (code, 6);
1695         s390_word (code, cfg->method);
1696         s390_word (code, func);
1697         s390_l    (code, s390_r2, 0, s390_r13, 4);
1698         s390_l    (code, s390_r1, 0, s390_r13, 8);
1699         s390_basr (code, s390_r14, s390_r1);
1700
1701         switch (save_mode) {
1702         case SAVE_TWO:
1703                 s390_lm  (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1704                 break;
1705         case SAVE_ONE:
1706                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1707                 break;
1708         case SAVE_FP:
1709                 s390_ld  (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1710                 break;
1711         case SAVE_STRUCT:
1712                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1713                 break;
1714         case SAVE_NONE:
1715         default:
1716                 break;
1717         }
1718
1719         return code;
1720 }
1721
1722 /*========================= End of Function ========================*/
1723
1724 /*------------------------------------------------------------------*/
1725 /*                                                                  */
1726 /* Name         - peephole_pass                                     */
1727 /*                                                                  */
1728 /* Function     - Form a peephole pass at the code looking for      */
1729 /*                simple optimizations.                             */
1730 /*                                                                  */
1731 /*------------------------------------------------------------------*/
1732
1733 static void
1734 peephole_pass (MonoCompile *cfg, MonoBasicBlock *bb)
1735 {
1736         MonoInst *ins, *last_ins = NULL;
1737         ins = bb->code;
1738
1739         while (ins) {
1740
1741                 switch (ins->opcode) {
1742                 case OP_MUL_IMM:
1743                         /* remove unnecessary multiplication with 1 */
1744                         if (ins->inst_imm == 1) {
1745                                 if (ins->dreg != ins->sreg1) {
1746                                         ins->opcode = OP_MOVE;
1747                                 } else {
1748                                         last_ins->next = ins->next;
1749                                         ins = ins->next;
1750                                         continue;
1751                                 }
1752                         }
1753                         break;
1754                 case OP_LOAD_MEMBASE:
1755                 case OP_LOADI4_MEMBASE:
1756                         /*
1757                          * OP_STORE_MEMBASE_REG reg, offset(basereg)
1758                          * OP_LOAD_MEMBASE offset(basereg), reg
1759                          */
1760                         if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_REG
1761                                          || last_ins->opcode == OP_STORE_MEMBASE_REG) &&
1762                             ins->inst_basereg == last_ins->inst_destbasereg &&
1763                             ins->inst_offset == last_ins->inst_offset) {
1764                                 if (ins->dreg == last_ins->sreg1) {
1765                                         last_ins->next = ins->next;
1766                                         ins = ins->next;
1767                                         continue;
1768                                 } else {
1769                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1770                                         ins->opcode = OP_MOVE;
1771                                         ins->sreg1 = last_ins->sreg1;
1772                                 }
1773
1774                         /*
1775                          * Note: reg1 must be different from the basereg in the second load
1776                          * OP_LOAD_MEMBASE offset(basereg), reg1
1777                          * OP_LOAD_MEMBASE offset(basereg), reg2
1778                          * -->
1779                          * OP_LOAD_MEMBASE offset(basereg), reg1
1780                          * OP_MOVE reg1, reg2
1781                          */
1782                         } if (last_ins && (last_ins->opcode == OP_LOADI4_MEMBASE
1783                                            || last_ins->opcode == OP_LOAD_MEMBASE) &&
1784                               ins->inst_basereg != last_ins->dreg &&
1785                               ins->inst_basereg == last_ins->inst_basereg &&
1786                               ins->inst_offset == last_ins->inst_offset) {
1787
1788                                 if (ins->dreg == last_ins->dreg) {
1789                                         last_ins->next = ins->next;
1790                                         ins = ins->next;
1791                                         continue;
1792                                 } else {
1793                                         ins->opcode = OP_MOVE;
1794                                         ins->sreg1 = last_ins->dreg;
1795                                 }
1796
1797                                 //g_assert_not_reached ();
1798
1799 #if 0
1800                         /*
1801                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1802                          * OP_LOAD_MEMBASE offset(basereg), reg
1803                          * -->
1804                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1805                          * OP_ICONST reg, imm
1806                          */
1807                         } else if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_IMM
1808                                                 || last_ins->opcode == OP_STORE_MEMBASE_IMM) &&
1809                                    ins->inst_basereg == last_ins->inst_destbasereg &&
1810                                    ins->inst_offset == last_ins->inst_offset) {
1811                                 //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1812                                 ins->opcode = OP_ICONST;
1813                                 ins->inst_c0 = last_ins->inst_imm;
1814                                 g_assert_not_reached (); // check this rule
1815 #endif
1816                         }
1817                         break;
1818                 case OP_LOADU1_MEMBASE:
1819                 case OP_LOADI1_MEMBASE:
1820                         if (last_ins && (last_ins->opcode == OP_STOREI1_MEMBASE_REG) &&
1821                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1822                                         ins->inst_offset == last_ins->inst_offset) {
1823                                 if (ins->dreg == last_ins->sreg1) {
1824                                         last_ins->next = ins->next;
1825                                         ins = ins->next;
1826                                         continue;
1827                                 } else {
1828                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1829                                         ins->opcode = OP_MOVE;
1830                                         ins->sreg1 = last_ins->sreg1;
1831                                 }
1832                         }
1833                         break;
1834                 case OP_LOADU2_MEMBASE:
1835                 case OP_LOADI2_MEMBASE:
1836                         if (last_ins && (last_ins->opcode == OP_STOREI2_MEMBASE_REG) &&
1837                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1838                                         ins->inst_offset == last_ins->inst_offset) {
1839                                 if (ins->dreg == last_ins->sreg1) {
1840                                         last_ins->next = ins->next;
1841                                         ins = ins->next;
1842                                         continue;
1843                                 } else {
1844                                         ins->opcode = OP_MOVE;
1845                                         ins->sreg1 = last_ins->sreg1;
1846                                 }
1847                         }
1848                         break;
1849                 case CEE_CONV_I4:
1850                 case CEE_CONV_U4:
1851                 case OP_MOVE:
1852                         /*
1853                          * OP_MOVE reg, reg
1854                          */
1855                         if (ins->dreg == ins->sreg1) {
1856                                 if (last_ins)
1857                                         last_ins->next = ins->next;
1858                                 ins = ins->next;
1859                                 continue;
1860                         }
1861                         /*
1862                          * OP_MOVE sreg, dreg
1863                          * OP_MOVE dreg, sreg
1864                          */
1865                         if (last_ins && last_ins->opcode == OP_MOVE &&
1866                             ins->sreg1 == last_ins->dreg &&
1867                             ins->dreg == last_ins->sreg1) {
1868                                 last_ins->next = ins->next;
1869                                 ins = ins->next;
1870                                 continue;
1871                         }
1872                         break;
1873                 }
1874                 last_ins = ins;
1875                 ins = ins->next;
1876         }
1877         bb->last_ins = last_ins;
1878 }
1879
1880 /*========================= End of Function ========================*/
1881
1882 /*------------------------------------------------------------------*/
1883 /*                                                                  */
1884 /* Name         - mono_spillvar_offset                              */
1885 /*                                                                  */
1886 /* Function     - Returns the offset used by spillvar. It allocates */
1887 /*                a new spill variable if necessary.                */
1888 /*                                                                  */
1889 /*------------------------------------------------------------------*/
1890
1891 static int
1892 mono_spillvar_offset (MonoCompile *cfg, int spillvar)
1893 {
1894         MonoSpillInfo **si, *info;
1895         int i = 0;
1896
1897         si = &cfg->spill_info;
1898
1899         while (i <= spillvar) {
1900
1901                 if (!*si) {
1902                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1903                         info->next = NULL;
1904                         info->offset = cfg->stack_offset;
1905                         cfg->stack_offset += sizeof (gpointer);
1906                 }
1907
1908                 if (i == spillvar)
1909                         return (*si)->offset;
1910
1911                 i++;
1912                 si = &(*si)->next;
1913         }
1914
1915         g_assert_not_reached ();
1916         return 0;
1917 }
1918
1919 /*========================= End of Function ========================*/
1920
1921 /*------------------------------------------------------------------*/
1922 /*                                                                  */
1923 /* Name         - mono_spillvar_offset_float                        */
1924 /*                                                                  */
1925 /* Function     -                                                   */
1926 /*                                                                  */
1927 /*------------------------------------------------------------------*/
1928
1929 static int
1930 mono_spillvar_offset_float (MonoCompile *cfg, int spillvar)
1931 {
1932         MonoSpillInfo **si, *info;
1933         int i = 0;
1934
1935         si = &cfg->spill_info_float;
1936
1937         while (i <= spillvar) {
1938
1939                 if (!*si) {
1940                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1941                         info->next         = NULL;
1942                         cfg->stack_offset  = S390_ALIGN(cfg->stack_offset, S390_STACK_ALIGNMENT);
1943                         info->offset       = cfg->stack_offset;
1944                         cfg->stack_offset += sizeof (double);
1945                 }
1946
1947                 if (i == spillvar)
1948                         return (*si)->offset;
1949
1950                 i++;
1951                 si = &(*si)->next;
1952         }
1953
1954         g_assert_not_reached ();
1955         return 0;
1956 }
1957
1958 /*========================= End of Function ========================*/
1959
1960 /*------------------------------------------------------------------*/
1961 /*                                                                  */
1962 /* Name         - print_ins                                         */
1963 /*                                                                  */
1964 /* Function     - Decode and print the instruction for tracing.     */
1965 /*                                                                  */
1966 /*------------------------------------------------------------------*/
1967
1968 static void
1969 print_ins (int i, MonoInst *ins)
1970 {
1971         const char *spec = ins_spec [ins->opcode];
1972         g_print ("\t%-2d %s", i, mono_inst_name (ins->opcode));
1973         if (spec [MONO_INST_DEST]) {
1974                 if (ins->dreg >= MONO_MAX_IREGS)
1975                         g_print (" R%d <-", ins->dreg);
1976                 else
1977                         g_print (" %s <-", mono_arch_regname (ins->dreg));
1978         }
1979         if (spec [MONO_INST_SRC1]) {
1980                 if (ins->sreg1 >= MONO_MAX_IREGS)
1981                         g_print (" R%d", ins->sreg1);
1982                 else
1983                         g_print (" %s", mono_arch_regname (ins->sreg1));
1984         }
1985         if (spec [MONO_INST_SRC2]) {
1986                 if (ins->sreg2 >= MONO_MAX_IREGS)
1987                         g_print (" R%d", ins->sreg2);
1988                 else
1989                         g_print (" %s", mono_arch_regname (ins->sreg2));
1990         }
1991         if (spec [MONO_INST_CLOB])
1992                 g_print (" clobbers: %c", spec [MONO_INST_CLOB]);
1993         g_print ("\n");
1994 }
1995
1996 /*========================= End of Function ========================*/
1997
1998 /*------------------------------------------------------------------*/
1999 /*                                                                  */
2000 /* Name         - print_regtrack.                                   */
2001 /*                                                                  */
2002 /* Function     -                                                   */
2003 /*                                                                  */
2004 /*------------------------------------------------------------------*/
2005
2006 static void
2007 print_regtrack (RegTrack *t, int num)
2008 {
2009         int i;
2010         char buf [32];
2011         const char *r;
2012
2013         for (i = 0; i < num; ++i) {
2014                 if (!t [i].born_in)
2015                         continue;
2016                 if (i >= MONO_MAX_IREGS) {
2017                         g_snprintf (buf, sizeof(buf), "R%d", i);
2018                         r = buf;
2019                 } else
2020                         r = mono_arch_regname (i);
2021                 g_print ("liveness: %s [%d - %d]\n", r, t [i].born_in, t[i].last_use);
2022         }
2023 }
2024
2025 /*========================= End of Function ========================*/
2026
2027 /*------------------------------------------------------------------*/
2028 /*                                                                  */
2029 /* Name         - inst_list_prepend                                 */
2030 /*                                                                  */
2031 /* Function     - Prepend an instruction to the list.               */
2032 /*                                                                  */
2033 /*------------------------------------------------------------------*/
2034
2035 static inline InstList*
2036 inst_list_prepend (MonoMemPool *pool, InstList *list, MonoInst *data)
2037 {
2038         InstList *item = mono_mempool_alloc (pool, sizeof (InstList));
2039         item->data = data;
2040         item->prev = NULL;
2041         item->next = list;
2042         if (list)
2043                 list->prev = item;
2044         return item;
2045 }
2046
2047 /*========================= End of Function ========================*/
2048
2049 /*------------------------------------------------------------------*/
2050 /*                                                                  */
2051 /* Name         - get_register_force_spilling                       */
2052 /*                                                                  */
2053 /* Function     - Force the spilling of the variable in the         */
2054 /*                symbolic register 'reg'.                          */
2055 /*                                                                  */
2056 /*------------------------------------------------------------------*/
2057
2058 static int
2059 get_register_force_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, int reg)
2060 {
2061         MonoInst *load;
2062         int i, sel, spill;
2063
2064         sel = cfg->rs->iassign [reg];
2065         i = reg;
2066         spill = ++cfg->spill_count;
2067         cfg->rs->iassign [i] = -spill - 1;
2068         mono_regstate_free_int (cfg->rs, sel);
2069         /*----------------------------------------------------------*/
2070         /* we need to create a spill var and insert a load to sel   */
2071         /* after the current instruction                            */
2072         /*----------------------------------------------------------*/
2073         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2074         load->dreg = sel;
2075         load->inst_basereg = cfg->frame_reg;
2076         load->inst_offset = mono_spillvar_offset (cfg, spill);
2077         if (item->prev) {
2078                 while (ins->next != item->prev->data)
2079                         ins = ins->next;
2080         }
2081         load->next = ins->next;
2082         ins->next  = load;
2083         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n",
2084                         spill, load->inst_offset, i, mono_arch_regname (sel)));
2085         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2086         g_assert (i == sel);
2087
2088         return sel;
2089 }
2090
2091 /*========================= End of Function ========================*/
2092
2093 /*------------------------------------------------------------------*/
2094 /*                                                                  */
2095 /* Name         -  get_register_spilling                            */
2096 /*                                                                  */
2097 /* Function     -                                                   */
2098 /*                                                                  */
2099 /*------------------------------------------------------------------*/
2100
2101 static int
2102 get_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2103 {
2104         MonoInst *load;
2105         int i, sel, spill;
2106
2107         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));
2108         /* exclude the registers in the current instruction */
2109         if (reg != ins->sreg1 &&
2110             (reg_is_freeable (ins->sreg1) ||
2111              (ins->sreg1 >= MONO_MAX_IREGS &&
2112               cfg->rs->iassign [ins->sreg1] >= 0))) {
2113                 if (ins->sreg1 >= MONO_MAX_IREGS)
2114                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg1]);
2115                 else
2116                         regmask &= ~ (1 << ins->sreg1);
2117                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2118         }
2119         if (reg != ins->sreg2 &&
2120             (reg_is_freeable (ins->sreg2) ||
2121              (ins->sreg2 >= MONO_MAX_IREGS &&
2122               cfg->rs->iassign [ins->sreg2] >= 0))) {
2123                 if (ins->sreg2 >= MONO_MAX_IREGS)
2124                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg2]);
2125                 else
2126                         regmask &= ~ (1 << ins->sreg2);
2127                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2128         }
2129         if (reg != ins->dreg && reg_is_freeable (ins->dreg)) {
2130                 regmask &= ~ (1 << ins->dreg);
2131                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2132         }
2133
2134         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2135         g_assert (regmask); /* need at least a register we can free */
2136         sel = -1;
2137         /* we should track prev_use and spill the register that's farther */
2138         for (i = 0; i < MONO_MAX_IREGS; ++i) {
2139                 if (regmask & (1 << i)) {
2140                         sel = i;
2141                         DEBUG (g_print ("selected register %s has assignment %d\n", mono_arch_regname (sel), cfg->rs->iassign [sel]));
2142                         break;
2143                 }
2144         }
2145         i = cfg->rs->isymbolic [sel];
2146         spill = ++cfg->spill_count;
2147         cfg->rs->iassign [i] = -spill - 1;
2148         mono_regstate_free_int (cfg->rs, sel);
2149         /* we need to create a spill var and insert a load to sel after the current instruction */
2150         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2151         load->dreg = sel;
2152         load->inst_basereg = cfg->frame_reg;
2153         load->inst_offset = mono_spillvar_offset (cfg, spill);
2154         if (item->prev) {
2155                 while (ins->next != item->prev->data)
2156                         ins = ins->next;
2157         }
2158         load->next = ins->next;
2159         ins->next = load;
2160         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2161         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2162         g_assert (i == sel);
2163
2164         return sel;
2165 }
2166
2167 /*========================= End of Function ========================*/
2168
2169 /*------------------------------------------------------------------*/
2170 /*                                                                  */
2171 /* Name         - get_float_register_spilling                       */
2172 /*                                                                  */
2173 /* Function     -                                                   */
2174 /*                                                                  */
2175 /*------------------------------------------------------------------*/
2176
2177 static int
2178 get_float_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2179 {
2180         MonoInst *load;
2181         int i, sel, spill;
2182
2183         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));
2184         /* exclude the registers in the current instruction */
2185         if (reg != ins->sreg1 &&
2186             (freg_is_freeable (ins->sreg1) ||
2187              (ins->sreg1 >= MONO_MAX_FREGS &&
2188               cfg->rs->fassign [ins->sreg1] >= 0))) {
2189                 if (ins->sreg1 >= MONO_MAX_FREGS)
2190                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg1]);
2191                 else
2192                         regmask &= ~ (1 << ins->sreg1);
2193                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2194         }
2195         if (reg != ins->sreg2 &&
2196             (freg_is_freeable (ins->sreg2) ||
2197              (ins->sreg2 >= MONO_MAX_FREGS &&
2198               cfg->rs->fassign [ins->sreg2] >= 0))) {
2199                 if (ins->sreg2 >= MONO_MAX_FREGS)
2200                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg2]);
2201                 else
2202                         regmask &= ~ (1 << ins->sreg2);
2203                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2204         }
2205         if (reg != ins->dreg && freg_is_freeable (ins->dreg)) {
2206                 regmask &= ~ (1 << ins->dreg);
2207                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2208         }
2209
2210         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2211         g_assert (regmask); /* need at least a register we can free */
2212         sel = -1;
2213         /* we should track prev_use and spill the register that's farther */
2214         for (i = 0; i < MONO_MAX_FREGS; ++i) {
2215                 if (regmask & (1 << i)) {
2216                         sel = i;
2217                         DEBUG (g_print ("selected register %s has assignment %d\n",
2218                                         mono_arch_regname (sel), cfg->rs->fassign [sel]));
2219                         break;
2220                 }
2221         }
2222         i = cfg->rs->fsymbolic [sel];
2223         spill = ++cfg->spill_count;
2224         cfg->rs->fassign [i] = -spill - 1;
2225         mono_regstate_free_float(cfg->rs, sel);
2226         /* we need to create a spill var and insert a load to sel after the current instruction */
2227         MONO_INST_NEW (cfg, load, OP_LOADR8_MEMBASE);
2228         load->dreg = sel;
2229         load->inst_basereg = cfg->frame_reg;
2230         load->inst_offset = mono_spillvar_offset_float (cfg, spill);
2231         if (item->prev) {
2232                 while (ins->next != item->prev->data)
2233                         ins = ins->next;
2234         }
2235         load->next = ins->next;
2236         ins->next = load;
2237         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2238         i = mono_regstate_alloc_float (cfg->rs, 1 << sel);
2239         g_assert (i == sel);
2240
2241         return sel;
2242 }
2243
2244 /*========================= End of Function ========================*/
2245
2246 /*------------------------------------------------------------------*/
2247 /*                                                                  */
2248 /* Name         - create_copy_ins                                   */
2249 /*                                                                  */
2250 /* Function     - Create an instruction to copy from reg to reg.    */
2251 /*                                                                  */
2252 /*------------------------------------------------------------------*/
2253
2254 static MonoInst*
2255 create_copy_ins (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2256 {
2257         MonoInst *copy;
2258         MONO_INST_NEW (cfg, copy, OP_MOVE);
2259         copy->dreg = dest;
2260         copy->sreg1 = src;
2261         if (ins) {
2262                 copy->next = ins->next;
2263                 ins->next = copy;
2264         }
2265         DEBUG (g_print ("\tforced copy from %s to %s\n",
2266                         mono_arch_regname (src), mono_arch_regname (dest)));
2267         return copy;
2268 }
2269
2270 /*========================= End of Function ========================*/
2271
2272 /*------------------------------------------------------------------*/
2273 /*                                                                  */
2274 /* Name         - create_copy_ins_float                             */
2275 /*                                                                  */
2276 /* Function     - Create an instruction to copy from float reg to   */
2277 /*                float reg.                                        */
2278 /*                                                                  */
2279 /*------------------------------------------------------------------*/
2280
2281 static MonoInst*
2282 create_copy_ins_float (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2283 {
2284         MonoInst *copy;
2285         MONO_INST_NEW (cfg, copy, OP_FMOVE);
2286         copy->dreg = dest;
2287         copy->sreg1 = src;
2288         if (ins) {
2289                 copy->next = ins->next;
2290                 ins->next = copy;
2291         }
2292         DEBUG (g_print ("\tforced copy from %s to %s\n",
2293                         mono_arch_regname (src), mono_arch_regname (dest)));
2294         return copy;
2295 }
2296
2297 /*========================= End of Function ========================*/
2298
2299 /*------------------------------------------------------------------*/
2300 /*                                                                  */
2301 /* Name         - create_spilled_store                              */
2302 /*                                                                  */
2303 /* Function     - Spill register to storage.                        */
2304 /*                                                                  */
2305 /*------------------------------------------------------------------*/
2306
2307 static MonoInst*
2308 create_spilled_store (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2309 {
2310         MonoInst *store;
2311         MONO_INST_NEW (cfg, store, OP_STORE_MEMBASE_REG);
2312         store->sreg1 = reg;
2313         store->inst_destbasereg = cfg->frame_reg;
2314         store->inst_offset = mono_spillvar_offset (cfg, spill);
2315         if (ins) {
2316                 store->next = ins->next;
2317                 ins->next = store;
2318         }
2319         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2320                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2321         return store;
2322 }
2323
2324 /*========================= End of Function ========================*/
2325
2326 /*------------------------------------------------------------------*/
2327 /*                                                                  */
2328 /* Name         - create_spilled_store_float                        */
2329 /*                                                                  */
2330 /* Function     - Spill floating point register to storage.         */
2331 /*                                                                  */
2332 /*------------------------------------------------------------------*/
2333
2334 static MonoInst*
2335 create_spilled_store_float (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2336 {
2337         MonoInst *store;
2338         MONO_INST_NEW (cfg, store, OP_STORER8_MEMBASE_REG);
2339         store->sreg1 = reg;
2340         store->inst_destbasereg = cfg->frame_reg;
2341         store->inst_offset = mono_spillvar_offset_float (cfg, spill);
2342         if (ins) {
2343                 store->next = ins->next;
2344                 ins->next = store;
2345         }
2346         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2347                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2348         return store;
2349 }
2350
2351 /*========================= End of Function ========================*/
2352
2353 /*------------------------------------------------------------------*/
2354 /*                                                                  */
2355 /* Name         - insert_before_ins                                 */
2356 /*                                                                  */
2357 /* Function     - Insert an instruction before another.             */
2358 /*                                                                  */
2359 /*------------------------------------------------------------------*/
2360
2361 static void
2362 insert_before_ins (MonoInst *ins, InstList *item, MonoInst* to_insert)
2363 {
2364         MonoInst *prev;
2365         g_assert (item->next);
2366         prev = item->next->data;
2367
2368         while (prev->next != ins)
2369                 prev = prev->next;
2370         to_insert->next = ins;
2371         prev->next = to_insert;
2372         /*
2373          * needed otherwise in the next instruction we can add an ins to the
2374          * end and that would get past this instruction.
2375          */
2376         item->data = to_insert;
2377 }
2378
2379 /*========================= End of Function ========================*/
2380
2381 /*------------------------------------------------------------------*/
2382 /*                                                                  */
2383 /* Name         - alloc_int_reg                                     */
2384 /*                                                                  */
2385 /* Function     - Allocate a general register.                      */
2386 /*                                                                  */
2387 /*------------------------------------------------------------------*/
2388
2389 static int
2390 alloc_int_reg (MonoCompile *cfg, InstList *curinst, MonoInst *ins, int sym_reg, guint32 allow_mask)
2391 {
2392         int val = cfg->rs->iassign [sym_reg];
2393         if (val < 0) {
2394                 int spill = 0;
2395                 if (val < -1) {
2396                         /* the register gets spilled after this inst */
2397                         spill = -val -1;
2398                 }
2399                 val = mono_regstate_alloc_int (cfg->rs, allow_mask);
2400                 if (val < 0)
2401                         val = get_register_spilling (cfg, curinst, ins, allow_mask, sym_reg);
2402                 cfg->rs->iassign [sym_reg] = val;
2403                 /* add option to store before the instruction for src registers */
2404                 if (spill)
2405                         create_spilled_store (cfg, spill, val, sym_reg, ins);
2406         }
2407         cfg->rs->isymbolic [val] = sym_reg;
2408         return val;
2409 }
2410
2411 /*========================= End of Function ========================*/
2412
2413 /*------------------------------------------------------------------*/
2414 /*                                                                  */
2415 /* Name         - mono_arch_local_regalloc.                         */
2416 /*                                                                  */
2417 /* Function     - We first scan the list of instructions and we     */
2418 /*                save the liveness information of each register    */
2419 /*                (when the register is first used, when its value  */
2420 /*                is set etc.). We also reverse the list of instr-  */
2421 /*                uctions (in the InstList list) because assigning  */
2422 /*                registers backwards allows for more tricks to be  */
2423 /*                used.                                             */
2424 /*                                                                  */
2425 /*------------------------------------------------------------------*/
2426
2427 void
2428 mono_arch_local_regalloc (MonoCompile *cfg, MonoBasicBlock *bb)
2429 {
2430         MonoInst *ins;
2431         MonoRegState *rs = cfg->rs;
2432         int i, val;
2433         RegTrack *reginfo, *reginfof;
2434         RegTrack *reginfo1, *reginfo2, *reginfod;
2435         InstList *tmp, *reversed = NULL;
2436         const char *spec;
2437         guint32 src1_mask, src2_mask, dest_mask;
2438         guint32 cur_iregs, cur_fregs;
2439
2440         if (!bb->code)
2441                 return;
2442         rs->next_vireg = bb->max_ireg;
2443         rs->next_vfreg = bb->max_freg;
2444         mono_regstate_assign (rs);
2445         reginfo = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vireg);
2446         reginfof = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vfreg);
2447         rs->ifree_mask = S390_CALLER_REGS;
2448         rs->ffree_mask = S390_CALLER_FREGS;
2449
2450         ins = bb->code;
2451         i = 1;
2452         DEBUG (g_print ("LOCAL regalloc: basic block: %d\n", bb->block_num));
2453         /* forward pass on the instructions to collect register liveness info */
2454         while (ins) {
2455                 spec = ins_spec [ins->opcode];
2456                 DEBUG (print_ins (i, ins));
2457                 if (spec [MONO_INST_CLOB] == 'c') {
2458                         MonoCallInst * call = (MonoCallInst*)ins;
2459                         int j;
2460                 }
2461                 if (spec [MONO_INST_SRC1]) {
2462                         if (spec [MONO_INST_SRC1] == 'f')
2463                                 reginfo1 = reginfof;
2464                         else
2465                                 reginfo1 = reginfo;
2466                         reginfo1 [ins->sreg1].prev_use = reginfo1 [ins->sreg1].last_use;
2467                         reginfo1 [ins->sreg1].last_use = i;
2468                 } else {
2469                         ins->sreg1 = -1;
2470                 }
2471                 if (spec [MONO_INST_SRC2]) {
2472                         if (spec [MONO_INST_SRC2] == 'f')
2473                                 reginfo2 = reginfof;
2474                         else
2475                                 reginfo2 = reginfo;
2476                         reginfo2 [ins->sreg2].prev_use = reginfo2 [ins->sreg2].last_use;
2477                         reginfo2 [ins->sreg2].last_use = i;
2478                 } else {
2479                         ins->sreg2 = -1;
2480                 }
2481                 if (spec [MONO_INST_DEST]) {
2482                         if (spec [MONO_INST_DEST] == 'f')
2483                                 reginfod = reginfof;
2484                         else
2485                                 reginfod = reginfo;
2486                         if (spec [MONO_INST_DEST] != 'b') /* it's not just a base register */
2487                                 reginfod [ins->dreg].killed_in = i;
2488                         reginfod [ins->dreg].prev_use = reginfod [ins->dreg].last_use;
2489                         reginfod [ins->dreg].last_use = i;
2490                         if (reginfod [ins->dreg].born_in == 0 || reginfod [ins->dreg].born_in > i)
2491                                 reginfod [ins->dreg].born_in = i;
2492                         if (spec [MONO_INST_DEST] == 'l') {
2493                                 /* result in eax:edx, the virtual register is allocated sequentially */
2494                                 reginfod [ins->dreg + 1].prev_use = reginfod [ins->dreg + 1].last_use;
2495                                 reginfod [ins->dreg + 1].last_use = i;
2496                                 if (reginfod [ins->dreg + 1].born_in == 0 || reginfod [ins->dreg + 1].born_in > i)
2497                                         reginfod [ins->dreg + 1].born_in = i;
2498                         }
2499                 } else {
2500                         ins->dreg = -1;
2501                 }
2502                 reversed = inst_list_prepend (cfg->mempool, reversed, ins);
2503                 ++i;
2504                 ins = ins->next;
2505         }
2506
2507         cur_iregs = S390_CALLER_REGS;
2508         cur_fregs = S390_CALLER_FREGS;
2509
2510         DEBUG (print_regtrack (reginfo, rs->next_vireg));
2511         DEBUG (print_regtrack (reginfof, rs->next_vfreg));
2512         tmp = reversed;
2513         while (tmp) {
2514                 int prev_dreg, prev_sreg1, prev_sreg2;
2515                 --i;
2516                 ins = tmp->data;
2517                 spec = ins_spec [ins->opcode];
2518                 DEBUG (g_print ("processing:"));
2519                 DEBUG (print_ins (i, ins));
2520                 /* make the register available for allocation: FIXME add fp reg */
2521                 if (ins->opcode == OP_SETREG || ins->opcode == OP_SETREGIMM) {
2522                         cur_iregs |= 1 << ins->dreg;
2523                         DEBUG (g_print ("adding %d to cur_iregs\n", ins->dreg));
2524                 } else if (ins->opcode == OP_SETFREG) {
2525                         cur_fregs |= 1 << ins->dreg;
2526                         DEBUG (g_print ("adding %d to cur_fregs\n", ins->dreg));
2527                 } else if (spec [MONO_INST_CLOB] == 'c') {
2528                         MonoCallInst *cinst = (MonoCallInst*)ins;
2529                         DEBUG (g_print ("excluding regs 0x%x from cur_iregs (0x%x)\n", cinst->used_iregs, cur_iregs));
2530                         DEBUG (g_print ("excluding fpregs 0x%x from cur_fregs (0x%x)\n", cinst->used_fregs, cur_fregs));
2531                         cur_iregs &= ~cinst->used_iregs;
2532                         cur_fregs &= ~cinst->used_fregs;
2533                         DEBUG (g_print ("available cur_iregs: 0x%x\n", cur_iregs));
2534                         DEBUG (g_print ("available cur_fregs: 0x%x\n", cur_fregs));
2535                         /* registers used by the calling convention are excluded from
2536                          * allocation: they will be selectively enabled when they are
2537                          * assigned by the special SETREG opcodes.
2538                          */
2539                 }
2540                 dest_mask = src1_mask = src2_mask = cur_iregs;
2541                 /* update for use with FP regs... */
2542                 if (spec [MONO_INST_DEST] == 'f') {
2543                         dest_mask = cur_fregs;
2544                         if (ins->dreg >= MONO_MAX_FREGS) {
2545                                 val = rs->fassign [ins->dreg];
2546                                 prev_dreg = ins->dreg;
2547                                 if (val < 0) {
2548                                         int spill = 0;
2549                                         if (val < -1) {
2550                                                 /* the register gets spilled after this inst */
2551                                                 spill = -val -1;
2552                                         }
2553                                         val = mono_regstate_alloc_float (rs, dest_mask);
2554                                         if (val < 0)
2555                                                 val = get_float_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2556                                         rs->fassign [ins->dreg] = val;
2557                                         if (spill)
2558                                                 create_spilled_store_float (cfg, spill, val, prev_dreg, ins);
2559                                 }
2560                                 DEBUG (g_print ("\tassigned dreg %s to dest R%d\n", mono_arch_regname (val), ins->dreg));
2561                                 rs->fsymbolic [val] = prev_dreg;
2562                                 ins->dreg = val;
2563                                 if (spec [MONO_INST_CLOB] == 'c' && ins->dreg != s390_f0) {
2564                                         /* this instruction only outputs to s390_f0, need to copy */
2565                                         create_copy_ins_float (cfg, ins->dreg, s390_f0, ins);
2566                                 }
2567                         } else {
2568                                 prev_dreg = -1;
2569                         }
2570                         if (freg_is_freeable (ins->dreg) && prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i || !(cur_fregs & (1 << ins->dreg)))) {
2571                                 DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2572                                 mono_regstate_free_float (rs, ins->dreg);
2573                         }
2574                 } else if (ins->dreg >= MONO_MAX_IREGS) {
2575                         val = rs->iassign [ins->dreg];
2576                         prev_dreg = ins->dreg;
2577                         if (val < 0) {
2578                                 int spill = 0;
2579                                 if (val < -1) {
2580                                         /* the register gets spilled after this inst */
2581                                         spill = -val -1;
2582                                 }
2583                                 val = mono_regstate_alloc_int (rs, dest_mask);
2584                                 if (val < 0)
2585                                         val = get_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2586                                 rs->iassign [ins->dreg] = val;
2587                                 if (spill)
2588                                         create_spilled_store (cfg, spill, val, prev_dreg, ins);
2589                         }
2590                         DEBUG (g_print ("\tassigned dreg %s to dest R%d\n", mono_arch_regname (val), ins->dreg));
2591                         rs->isymbolic [val] = prev_dreg;
2592                         ins->dreg = val;
2593                         if (spec [MONO_INST_DEST] == 'l') {
2594                                 int hreg = prev_dreg + 1;
2595                                 val = rs->iassign [hreg];
2596                                 if (val < 0) {
2597                                         int spill = 0;
2598                                         if (val < -1) {
2599                                                 /* the register gets spilled after this inst */
2600                                                 spill = -val -1;
2601                                         }
2602                                         val = mono_regstate_alloc_int (rs, dest_mask);
2603                                         if (val < 0)
2604                                                 val = get_register_spilling (cfg, tmp, ins, dest_mask, hreg);
2605                                         rs->iassign [hreg] = val;
2606                                         if (spill)
2607                                                 create_spilled_store (cfg, spill, val, hreg, ins);
2608                                 }
2609                                 DEBUG (g_print ("\tassigned hreg %s to dest R%d\n", mono_arch_regname (val), hreg));
2610                                 rs->isymbolic [val] = hreg;
2611                                 /* FIXME:? ins->dreg = val; */
2612                                 if (ins->dreg == s390_r3) {
2613                                         if (val != s390_r2)
2614                                                 create_copy_ins (cfg, val, s390_r2, ins);
2615                                 } else if (ins->dreg == s390_r2) {
2616                                         if (val == s390_r3) {
2617                                                 /* swap */
2618                                                 create_copy_ins (cfg, s390_r3, s390_r0, ins);
2619                                                 create_copy_ins (cfg, s390_r2, s390_r3, ins);
2620                                                 create_copy_ins (cfg, s390_r0, s390_r2, ins);
2621                                         } else {
2622                                                 /* two forced copies */
2623                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2624                                                 create_copy_ins (cfg, val, s390_r2, ins);
2625                                         }
2626                                 } else {
2627                                         if (val == s390_r2) {
2628                                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2629                                         } else {
2630                                                 /* two forced copies */
2631                                                 create_copy_ins (cfg, val, s390_r2, ins);
2632                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2633                                         }
2634                                 }
2635                                 if (reg_is_freeable (val) && hreg >= 0 && (reginfo [hreg].born_in >= i && !(cur_iregs & (1 << val)))) {
2636                                         DEBUG (g_print ("\tfreeable %s (R%d)\n", mono_arch_regname (val), hreg));
2637                                         mono_regstate_free_int (rs, val);
2638                                 }
2639                         } else if (spec [MONO_INST_DEST] == 'a' && ins->dreg != s390_r2 && spec [MONO_INST_CLOB] != 'd') {
2640                                 /* this instruction only outputs to s390_r2, need to copy */
2641                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2642                         }
2643                 } else {
2644                         prev_dreg = -1;
2645                 }
2646                 if (spec [MONO_INST_DEST] == 'f' &&
2647                     freg_is_freeable (ins->dreg) &&
2648                     prev_dreg >= 0 && (reginfof [prev_dreg].born_in >= i)) {
2649                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2650                         mono_regstate_free_float (rs, ins->dreg);
2651                 } else if (spec [MONO_INST_DEST] != 'f' &&
2652                            reg_is_freeable (ins->dreg) &&
2653                            prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i)) {
2654                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2655                          mono_regstate_free_int (rs, ins->dreg);
2656                 }
2657                 if (spec [MONO_INST_SRC1] == 'f') {
2658                         src1_mask = cur_fregs;
2659                         if (ins->sreg1 >= MONO_MAX_FREGS) {
2660                                 val = rs->fassign [ins->sreg1];
2661                                 prev_sreg1 = ins->sreg1;
2662                                 if (val < 0) {
2663                                         int spill = 0;
2664                                         if (val < -1) {
2665                                                 /* the register gets spilled after this inst */
2666                                                 spill = -val -1;
2667                                         }
2668                                         //g_assert (val == -1); /* source cannot be spilled */
2669                                         val = mono_regstate_alloc_float (rs, src1_mask);
2670                                         if (val < 0)
2671                                                 val = get_float_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2672                                         rs->fassign [ins->sreg1] = val;
2673                                         DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2674                                         if (spill) {
2675                                                 MonoInst *store = create_spilled_store_float (cfg, spill, val, prev_sreg1, NULL);
2676                                                 insert_before_ins (ins, tmp, store);
2677                                         }
2678                                 }
2679                                 rs->fsymbolic [val] = prev_sreg1;
2680                                 ins->sreg1 = val;
2681                         } else {
2682                                 prev_sreg1 = -1;
2683                         }
2684                 } else if (ins->sreg1 >= MONO_MAX_IREGS) {
2685                         val = rs->iassign [ins->sreg1];
2686                         prev_sreg1 = ins->sreg1;
2687                         if (val < 0) {
2688                                 int spill = 0;
2689                                 if (val < -1) {
2690                                         /* the register gets spilled after this inst */
2691                                         spill = -val -1;
2692 printf("val: %d spill: %d ins->sreg1: %d\n",val,spill,ins->sreg1);
2693                                 }
2694                                 val = mono_regstate_alloc_int (rs, src1_mask);
2695                                 if (val < 0)
2696                                         val = get_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2697                                 rs->iassign [ins->sreg1] = val;
2698                                 DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2699                                 if (spill) {
2700                                         MonoInst *store = create_spilled_store (cfg, spill, val, prev_sreg1, NULL);
2701                                         insert_before_ins (ins, tmp, store);
2702                                 }
2703                         }
2704                         rs->isymbolic [val] = prev_sreg1;
2705                         ins->sreg1 = val;
2706                 } else {
2707                         prev_sreg1 = -1;
2708                 }
2709                 /*----------------------------------------------*/
2710                 /* handle clobbering of sreg1                   */
2711                 /*----------------------------------------------*/
2712                 if ((spec [MONO_INST_CLOB] == '1' ||
2713                      spec [MONO_INST_CLOB] == 's') &&
2714                     ins->dreg != ins->sreg1) {
2715                         MonoInst *copy = create_copy_ins (cfg, ins->dreg, ins->sreg1, NULL);
2716                         DEBUG (g_print ("\tneed to copy sreg1 %s to dreg %s\n",
2717                                         mono_arch_regname (ins->sreg1),
2718                                         mono_arch_regname (ins->dreg)));
2719                         if (ins->sreg2 == -1 || spec [MONO_INST_CLOB] == 's') {
2720                                 /* note: the copy is inserted before the current instruction! */
2721                                 insert_before_ins (ins, tmp, copy);
2722                                 /* we set sreg1 to dest as well */
2723                                 prev_sreg1 = ins->sreg1 = ins->dreg;
2724                         } else {
2725                                 /* inserted after the operation */
2726                                 copy->next = ins->next;
2727                                 ins->next  = copy;
2728                         }
2729                 }
2730
2731                 if (spec [MONO_INST_SRC2] == 'f') {
2732                         src2_mask = cur_fregs;
2733                         if (ins->sreg2 >= MONO_MAX_FREGS) {
2734                                 val = rs->fassign [ins->sreg2];
2735                                 prev_sreg2 = ins->sreg2;
2736                                 if (val < 0) {
2737                                         int spill = 0;
2738                                         if (val < -1) {
2739                                                 /* the register gets spilled after this inst */
2740                                                 spill = -val -1;
2741                                         }
2742                                         val = mono_regstate_alloc_float (rs, src2_mask);
2743                                         if (val < 0)
2744                                                 val = get_float_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2745                                         rs->fassign [ins->sreg2] = val;
2746                                         DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2747                                         if (spill)
2748                                                 create_spilled_store_float (cfg, spill, val, prev_sreg2, ins);
2749                                 }
2750                                 rs->fsymbolic [val] = prev_sreg2;
2751                                 ins->sreg2 = val;
2752                         } else {
2753                                 prev_sreg2 = -1;
2754                         }
2755                 } else if (ins->sreg2 >= MONO_MAX_IREGS) {
2756                         val = rs->iassign [ins->sreg2];
2757                         prev_sreg2 = ins->sreg2;
2758                         if (val < 0) {
2759                                 int spill = 0;
2760                                 if (val < -1) {
2761                                         /* the register gets spilled after this inst */
2762                                         spill = -val -1;
2763                                 }
2764                                 val = mono_regstate_alloc_int (rs, src2_mask);
2765                                 if (val < 0)
2766                                         val = get_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2767                                 rs->iassign [ins->sreg2] = val;
2768                                 DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2769                                 if (spill)
2770                                         create_spilled_store (cfg, spill, val, prev_sreg2, ins);
2771                         }
2772                         rs->isymbolic [val] = prev_sreg2;
2773                         ins->sreg2 = val;
2774                 } else {
2775                         prev_sreg2 = -1;
2776                 }
2777
2778                 if (spec [MONO_INST_CLOB] == 'c') {
2779                         int j, s;
2780                         guint32 clob_mask = S390_CALLER_REGS;
2781                         for (j = 0; j < MONO_MAX_IREGS; ++j) {
2782                                 s = 1 << j;
2783                                 if ((clob_mask & s) && !(rs->ifree_mask & s) && j != ins->sreg1) {
2784                                         //g_warning ("register %s busy at call site\n", mono_arch_regname (j));
2785                                 }
2786                         }
2787                 }
2788                 /*if (reg_is_freeable (ins->sreg1) && prev_sreg1 >= 0 && reginfo [prev_sreg1].born_in >= i) {
2789                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg1)));
2790                         mono_regstate_free_int (rs, ins->sreg1);
2791                 }
2792                 if (reg_is_freeable (ins->sreg2) && prev_sreg2 >= 0 && reginfo [prev_sreg2].born_in >= i) {
2793                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg2)));
2794                         mono_regstate_free_int (rs, ins->sreg2);
2795                 }*/
2796
2797                 //DEBUG (print_ins (i, ins));
2798                 tmp = tmp->next;
2799         }
2800 }
2801
2802 /*========================= End of Function ========================*/
2803
2804 /*------------------------------------------------------------------*/
2805 /*                                                                  */
2806 /* Name         - emit_float_to_int                                 */
2807 /*                                                                  */
2808 /* Function     - Create instructions which will convert a floating */
2809 /*                point value to integer.                           */
2810 /*                                                                  */
2811 /*------------------------------------------------------------------*/
2812
2813 static guchar*
2814 emit_float_to_int (MonoCompile *cfg, guchar *code, int dreg, int sreg, int size, gboolean is_signed)
2815 {
2816         /* sreg is a float, dreg is an integer reg. */
2817         if (is_signed) {
2818                 s390_cfdbr (code, dreg, 5, sreg);
2819         } else {
2820                 s390_basr   (code, s390_r13, 0);
2821                 s390_j      (code, 10);
2822                 s390_double (code, 0x41e0000000000000);
2823                 s390_double (code, 0x41f0000000000000);
2824                 s390_ldr    (code, s390_f0, sreg);
2825                 s390_cdb    (code, s390_f0, 0, s390_r13, 0);
2826                 s390_jl     (code, 10);
2827                 s390_sdb    (code, s390_f0, 0, s390_r13, 8);
2828                 s390_cfdbr  (code, dreg, 7, s390_f0);
2829                 s390_j      (code, 5);
2830                 s390_cfdbr  (code, dreg, 5, sreg);
2831         }
2832         return code;
2833 }
2834
2835 /*========================= End of Function ========================*/
2836
2837 /*------------------------------------------------------------------*/
2838 /*                                                                  */
2839 /* Name         - mono_emit_stack_alloc                             */
2840 /*                                                                  */
2841 /* Function     -                                                   */
2842 /*                                                                  */
2843 /*------------------------------------------------------------------*/
2844
2845 static unsigned char*
2846 mono_emit_stack_alloc (guchar *code, MonoInst* tree)
2847 {
2848         return code;
2849 }
2850
2851 /*========================= End of Function ========================*/
2852
2853 /*------------------------------------------------------------------*/
2854 /*                                                                  */
2855 /* Name         - mono_arch_output_basic_block                      */
2856 /*                                                                  */
2857 /* Function     - Perform the "real" work of emitting instructions  */
2858 /*                that will do the work of in the basic block.      */
2859 /*                                                                  */
2860 /*------------------------------------------------------------------*/
2861
2862 void
2863 mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
2864 {
2865         MonoInst *ins;
2866         MonoCallInst *call;
2867         guint offset;
2868         guint8 *code = cfg->native_code + cfg->code_len;
2869         MonoInst *last_ins = NULL;
2870         guint last_offset = 0;
2871         int max_len, cpos;
2872
2873         if (cfg->opt & MONO_OPT_PEEPHOLE)
2874                 peephole_pass (cfg, bb);
2875
2876         /* we don't align basic blocks of loops on s390 */
2877
2878         if (cfg->verbose_level > 2)
2879                 g_print ("Basic block %d starting at offset 0x%x\n", bb->block_num, bb->native_offset);
2880
2881         cpos = bb->max_offset;
2882
2883         if (cfg->prof_options & MONO_PROFILE_COVERAGE) {
2884                 //MonoCoverageInfo *cov = mono_get_coverage_info (cfg->method);
2885                 //g_assert (!mono_compile_aot);
2886                 //cpos += 6;
2887                 //if (bb->cil_code)
2888                 //      cov->data [bb->dfn].iloffset = bb->cil_code - cfg->cil_code;
2889                 /* this is not thread save, but good enough */
2890                 /* fixme: howto handle overflows? */
2891                 //x86_inc_mem (code, &cov->data [bb->dfn].count);
2892         }
2893
2894         ins = bb->code;
2895         while (ins) {
2896                 offset = code - cfg->native_code;
2897
2898                 max_len = ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
2899
2900                 if (offset > (cfg->code_size - max_len - 16)) {
2901                         cfg->code_size *= 2;
2902                         cfg->native_code = g_realloc (cfg->native_code, cfg->code_size);
2903                         code = cfg->native_code + offset;
2904                 }
2905
2906                 switch (ins->opcode) {
2907                 case OP_STOREI1_MEMBASE_IMM:
2908                         s390_lhi (code, s390_r14, ins->inst_imm);
2909                         if (s390_is_uimm12(ins->inst_offset))
2910                                 s390_stc (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2911                         else {
2912                                 s390_basr (code, s390_r13, 0);
2913                                 s390_j    (code, 4);
2914                                 s390_word (code, ins->inst_offset);
2915                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2916                                 s390_stc  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2917                         }
2918                         break;
2919                 case OP_STOREI2_MEMBASE_IMM:
2920                         s390_lhi (code, s390_r14, ins->inst_imm);
2921                         if (s390_is_uimm12(ins->inst_offset)) {
2922                                 s390_sth (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2923                         } else {
2924                                 s390_basr (code, s390_r14, 0);
2925                                 s390_j    (code, 4);
2926                                 s390_word (code, ins->inst_offset);
2927                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2928                                 s390_sth  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2929                         }
2930                         break;
2931                 case OP_STORE_MEMBASE_IMM:
2932                 case OP_STOREI4_MEMBASE_IMM:
2933                         if (s390_is_imm16(ins->inst_imm)) {
2934                                 s390_lhi  (code, s390_r14, ins->inst_imm);
2935                         } else {
2936                                 s390_basr (code, s390_r13, 0);
2937                                 s390_j    (code, 4);
2938                                 s390_word (code, ins->inst_imm);
2939                                 s390_l    (code, s390_r14, 0, s390_r13, 4);
2940                         }
2941                         if (s390_is_uimm12(ins->inst_offset)) {
2942                                 s390_st  (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2943                         } else {
2944                                 s390_basr (code, s390_r13, 0);
2945                                 s390_j    (code, 4);
2946                                 s390_word (code, ins->inst_offset);
2947                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2948                                 s390_st   (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2949                         }
2950                         break;
2951                 case OP_STOREI1_MEMBASE_REG:
2952                         if (s390_is_uimm12(ins->inst_offset)) {
2953                                 s390_stc  (code, ins->sreg1, 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, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2960                         }
2961                         break;
2962                 case OP_STOREI2_MEMBASE_REG:
2963                         if (s390_is_uimm12(ins->inst_offset)) {
2964                                 s390_sth  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2965                         } else {
2966                                 s390_basr (code, s390_r13, 0);
2967                                 s390_j    (code, 4);
2968                                 s390_word (code, ins->inst_offset);
2969                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2970                                 s390_sth  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2971                         }
2972                         break;
2973                 case OP_STORE_MEMBASE_REG:
2974                 case OP_STOREI4_MEMBASE_REG:
2975                         if (s390_is_uimm12(ins->inst_offset)) {
2976                                 s390_st   (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2977                         } else {
2978                                 s390_basr (code, s390_r13, 0);
2979                                 s390_j    (code, 4);
2980                                 s390_word (code, ins->inst_offset);
2981                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2982                                 s390_st   (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2983                         }
2984                         break;
2985                 case CEE_LDIND_I:
2986                 case CEE_LDIND_I4:
2987                 case CEE_LDIND_U4:
2988                         s390_basr (code, s390_r13, 0);
2989                         s390_j    (code, 4);
2990                         s390_word (code, ins->inst_p0);
2991                         s390_l    (code, s390_r13, 0, s390_r13, 4);
2992                         s390_l    (code, ins->dreg, 0, s390_r13, 0);
2993                         break;
2994                 case OP_LOADU4_MEM:
2995                         g_assert_not_reached ();
2996                         break;
2997                 case OP_LOAD_MEMBASE:
2998                 case OP_LOADI4_MEMBASE:
2999                 case OP_LOADU4_MEMBASE:
3000                         if (s390_is_uimm12(ins->inst_offset))
3001                                 s390_l    (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3002                         else {
3003                                 if (s390_is_imm16(ins->inst_offset)) {
3004                                         s390_lhi (code, s390_r13, ins->inst_offset);
3005                                         s390_l   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3006                                 } else {
3007                                         s390_basr (code, s390_r13, 0);
3008                                         s390_j    (code, 4);
3009                                         s390_word (code, ins->inst_offset);
3010                                         s390_l    (code, s390_r13, 0, s390_r13, 4);
3011                                         s390_l    (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3012                                 }
3013                         }
3014                         break;
3015                 case OP_LOADU1_MEMBASE:
3016                         s390_lhi (code, s390_r0, 0);
3017                         if (s390_is_uimm12(ins->inst_offset))
3018                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3019                         else {
3020                                 s390_basr (code, s390_r13, 0);
3021                                 s390_j    (code, 4);
3022                                 s390_word (code, ins->inst_offset);
3023                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3024                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3025                         }
3026                         s390_lr   (code, ins->dreg, s390_r0);
3027                         break;
3028                 case OP_LOADI1_MEMBASE:
3029                         s390_lhi (code, s390_r0, 0);
3030                         if (s390_is_uimm12(ins->inst_offset))
3031                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3032                         else {
3033                                 s390_basr (code, s390_r13, 0);
3034                                 s390_j    (code, 4);
3035                                 s390_word (code, ins->inst_offset);
3036                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3037                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3038                         }
3039                         s390_lhi  (code, s390_r13, 0x80);
3040                         s390_nr   (code, s390_r13, s390_r0);
3041                         s390_jz   (code, 5);
3042                         s390_lhi  (code, s390_r13, 0xff00);
3043                         s390_or   (code, s390_r0, s390_r13);
3044                         s390_lr   (code, ins->dreg, s390_r0);
3045                         break;
3046                 case OP_LOADU2_MEMBASE:
3047                         s390_lhi (code, s390_r0, 0);
3048                         if (s390_is_uimm12(ins->inst_offset))
3049                                 s390_icm  (code, s390_r0, 3, ins->inst_basereg, ins->inst_offset);
3050                         else {
3051                                 s390_basr (code, s390_r13, 0);
3052                                 s390_j    (code, 4);
3053                                 s390_word (code, ins->inst_offset);
3054                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3055                                 s390_ar   (code, s390_r13, ins->inst_basereg);
3056                                 s390_icm  (code, s390_r0, 3, s390_r13, 0);
3057                         }
3058                         s390_lr  (code, ins->dreg, s390_r0);
3059                         break;
3060                 case OP_LOADI2_MEMBASE:
3061                         s390_lhi (code, s390_r0, 0);
3062                         if (s390_is_uimm12(ins->inst_offset))
3063                                 s390_lh   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3064                         else {
3065                                 s390_basr (code, s390_r13, 0);
3066                                 s390_j    (code, 4);
3067                                 s390_word (code, ins->inst_offset);
3068                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3069                                 s390_lh   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3070                         }
3071                         s390_lr  (code, ins->dreg, s390_r0);
3072                         break;
3073                 case CEE_CONV_I1:
3074                         s390_lhi  (code, s390_r0, 0x80);
3075                         if (ins->dreg != ins->sreg1) {
3076                                 s390_lr   (code, ins->dreg, ins->sreg1);
3077                         }
3078                         s390_nr   (code, s390_r0, ins->sreg1);
3079                         s390_jl   (code, 9);
3080                         s390_lhi  (code, s390_r13, -1);
3081                         s390_sll  (code, s390_r13, 0, 8);
3082                         s390_or   (code, ins->dreg, s390_r13);
3083                         break;
3084                 case CEE_CONV_I2:
3085                         s390_lhi  (code, s390_r0, 0x80);
3086                         s390_lr   (code, ins->dreg, ins->sreg1);
3087                         s390_nr   (code, s390_r0, ins->sreg1);
3088                         s390_jl   (code, 9);
3089                         s390_lhi  (code, s390_r13, -1);
3090                         s390_sll  (code, s390_r13, 0, 16);
3091                         s390_or   (code, ins->dreg, s390_r13);
3092                         break;
3093                 case CEE_CONV_U1:
3094                         s390_lhi  (code, s390_r0, 0xff);
3095                         if (ins->dreg != ins->sreg1) {
3096                                 s390_lr   (code, ins->dreg, ins->sreg1);
3097                         }
3098                         s390_nr   (code, ins->dreg, s390_r0);
3099                         break;
3100                 case CEE_CONV_U2:
3101                         s390_lhi  (code, s390_r0, -1);
3102                         s390_sll  (code, s390_r0, 0, 16);
3103                         s390_srl  (code, s390_r0, 0, 16);
3104                         if (ins->dreg != ins->sreg1) {
3105                                 s390_lr   (code, ins->dreg, ins->sreg1);
3106                         }
3107                         s390_nr   (code, ins->dreg, s390_r0);
3108                         break;
3109                 case OP_COMPARE:
3110                         if ((ins->next) &&
3111                             ((ins->next->opcode >= CEE_BNE_UN) &&
3112                              (ins->next->opcode <= CEE_BLT_UN)))
3113                                 s390_clr  (code, ins->sreg1, ins->sreg2);
3114                         else
3115                                 s390_cr   (code, ins->sreg1, ins->sreg2);
3116                         break;
3117                 case OP_COMPARE_IMM:
3118                         if (s390_is_imm16 (ins->inst_imm)) {
3119                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3120                                 if ((ins->next) &&
3121                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3122                                     (ins->next->opcode <= CEE_BLT_UN)))
3123                                         s390_clr  (code, ins->sreg1, s390_r0);
3124                                 else
3125                                         s390_cr   (code, ins->sreg1, s390_r0);
3126                         }
3127                         else {
3128                                 s390_basr (code, s390_r13, 0);
3129                                 s390_j    (code, 4);
3130                                 s390_word (code, ins->inst_imm);
3131                                 if ((ins->next) &&
3132                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3133                                     (ins->next->opcode <= CEE_BLT_UN)))
3134                                         s390_cl   (code, ins->sreg1, 0, s390_r13, 4);
3135                                 else
3136                                         s390_c    (code, ins->sreg1, 0, s390_r13, 4);
3137                         }
3138                         break;
3139                 case OP_X86_TEST_NULL:
3140                         s390_ltr (code, ins->sreg1, ins->sreg1);
3141                         break;
3142                 case CEE_BREAK:
3143                         s390_break (code);
3144                         break;
3145                 case OP_ADDCC:
3146                         if (ins->dreg != ins->sreg1) {
3147                                 s390_lr   (code, ins->dreg, ins->sreg1);
3148                         }
3149                         s390_alr  (code, ins->dreg, ins->sreg2);
3150                         break;
3151                 case CEE_ADD:
3152                         if (ins->dreg != ins->sreg1) {
3153                                 s390_lr   (code, ins->dreg, ins->sreg1);
3154                         }
3155                         s390_ar   (code, ins->dreg, ins->sreg2);
3156                         break;
3157                 case OP_ADC:
3158                         if (ins->dreg != ins->sreg1) {
3159                                 s390_lr   (code, ins->dreg, ins->sreg1);
3160                         }
3161                         s390_alcr (code, ins->dreg, ins->sreg2);
3162                         break;
3163                 case OP_ADD_IMM:
3164                         if ((ins->next) &&
3165                             (ins->next->opcode == OP_ADC_IMM)) {
3166                                 s390_basr (code, s390_r13, 0);
3167                                 s390_j    (code, 4);
3168                                 s390_word (code, ins->inst_imm);
3169                                 if (ins->dreg != ins->sreg1) {
3170                                         s390_lr   (code, ins->dreg, ins->sreg1);
3171                                 }
3172                                 s390_al   (code, ins->dreg, 0, s390_r13, 4);
3173                         } else {
3174                                 if (s390_is_imm16 (ins->inst_imm)) {
3175                                         if (ins->dreg != ins->sreg1) {
3176                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3177                                         }
3178                                         s390_ahi (code, ins->dreg, ins->inst_imm);
3179                                 } else {
3180                                         s390_basr (code, s390_r13, 0);
3181                                         s390_j    (code, 4);
3182                                         s390_word (code, ins->inst_imm);
3183                                         if (ins->dreg != ins->sreg1) {
3184                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3185                                         }
3186                                         s390_a    (code, ins->dreg, 0, s390_r13, 4);
3187                                 }
3188                         }
3189                         break;
3190                 case OP_ADC_IMM:
3191                         if (s390_is_imm16 (ins->inst_imm)) {
3192                                 if (ins->dreg != ins->sreg1) {
3193                                         s390_lr   (code, ins->dreg, ins->sreg1);
3194                                 }
3195                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3196                                 s390_alcr (code, ins->dreg, s390_r0);
3197                         } else {
3198                                 s390_basr (code, s390_r13, 0);
3199                                 s390_j    (code, 4);
3200                                 s390_word (code, ins->inst_imm);
3201                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3202                                 s390_alcr (code, ins->dreg, s390_r13);
3203                         }
3204                         break;
3205                 case OP_SUBCC:
3206                         if (ins->dreg != ins->sreg1) {
3207                                 s390_lr   (code, ins->dreg, ins->sreg1);
3208                         }
3209                         s390_sr (code, ins->dreg, ins->sreg2);
3210                         break;
3211                 case CEE_SUB:
3212                         if (ins->dreg != ins->sreg1) {
3213                                 s390_lr   (code, ins->dreg, ins->sreg1);
3214                         }
3215                         s390_sr   (code, ins->dreg, ins->sreg2);
3216                         break;
3217                 case OP_SBB:
3218                         if (ins->dreg != ins->sreg1) {
3219                                 s390_lr   (code, ins->dreg, ins->sreg1);
3220                         }
3221                         s390_slbr (code, ins->dreg, ins->sreg2);
3222                         break;
3223                 case OP_SUB_IMM:
3224                         if (s390_is_imm16 (-ins->inst_imm)) {
3225                                 if (ins->dreg != ins->sreg1) {
3226                                         s390_lr   (code, ins->dreg, ins->sreg1);
3227                                 }
3228                                 s390_ahi  (code, ins->dreg, -ins->inst_imm);
3229                         } else {
3230                                 s390_basr (code, s390_r13, 0);
3231                                 s390_j    (code, 4);
3232                                 s390_word (code, ins->inst_imm);
3233                                 if (ins->dreg != ins->sreg1) {
3234                                         s390_lr   (code, ins->dreg, ins->sreg1);
3235                                 }
3236                                 s390_s    (code, ins->dreg, 0, s390_r13, 4);
3237                         }
3238                         break;
3239                 case OP_SBB_IMM:
3240                         s390_basr (code, s390_r13, 0);
3241                         s390_j    (code, 4);
3242                         s390_word (code, ins->inst_imm);
3243                         s390_sl   (code, ins->dreg, 0, s390_r13, 4);
3244                         break;
3245                 case CEE_AND:
3246                         if (ins->sreg1 == ins->dreg) {
3247                                 s390_nr   (code, ins->dreg, ins->sreg2);
3248                         }
3249                         else {
3250                                 if (ins->sreg2 == ins->dreg) {
3251                                         s390_nr  (code, ins->dreg, ins->sreg1);
3252                                 }
3253                                 else {
3254                                         s390_lr  (code, ins->dreg, ins->sreg1);
3255                                         s390_nr  (code, ins->dreg, ins->sreg2);
3256                                 }
3257                         }
3258                         break;
3259                 case OP_AND_IMM:
3260                         if (s390_is_imm16 (ins->inst_imm)) {
3261                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3262                                 if (ins->dreg != ins->sreg1) {
3263                                         s390_lr   (code, ins->dreg, ins->sreg1);
3264                                 }
3265                                 s390_nr   (code, ins->dreg, s390_r0);
3266                         } else {
3267                                 s390_basr (code, s390_r13, 0);
3268                                 s390_j    (code, 4);
3269                                 s390_word (code, ins->inst_imm);
3270                                 if (ins->dreg != ins->sreg1) {
3271                                         s390_lr   (code, ins->dreg, ins->sreg1);
3272                                 }
3273                                 s390_n    (code, ins->dreg, 0, s390_r13, 4);
3274                         }
3275                         break;
3276                 case CEE_DIV:
3277                         s390_lr   (code, s390_r0, ins->sreg1);
3278                         s390_srda (code, s390_r0, 0, 32);
3279                         s390_dr   (code, s390_r0, ins->sreg2);
3280                         s390_lr   (code, ins->dreg, s390_r1);
3281                         break;
3282                 case CEE_DIV_UN:
3283                         s390_lr   (code, s390_r0, ins->sreg1);
3284                         s390_srdl (code, s390_r0, 0, 32);
3285                         s390_dlr  (code, s390_r0, ins->sreg2);
3286                         s390_lr   (code, ins->dreg, s390_r1);
3287                         break;
3288                 case OP_DIV_IMM:
3289                         if (s390_is_imm16 (ins->inst_imm)) {
3290                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3291                                 s390_lr   (code, s390_r0, ins->sreg1);
3292                         } else {
3293                                 s390_basr (code, s390_r13, 0);
3294                                 s390_j    (code, 4);
3295                                 s390_word (code, ins->inst_imm);
3296                                 s390_lr   (code, s390_r0, ins->sreg1);
3297                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3298                         }
3299                         s390_srda (code, s390_r0, 0, 32);
3300                         s390_dr   (code, s390_r0, ins->sreg2);
3301                         s390_lr   (code, ins->dreg, s390_r1);
3302                         break;
3303                 case CEE_REM:
3304                         s390_lr   (code, s390_r0, ins->sreg1);
3305                         s390_srda (code, s390_r0, 0, 32);
3306                         s390_dr   (code, s390_r0, ins->sreg2);
3307                         s390_lr   (code, ins->dreg, s390_r0);
3308                         break;
3309                 case CEE_REM_UN:
3310                         s390_lr   (code, s390_r0, ins->sreg1);
3311                         s390_srdl (code, s390_r0, 0, 32);
3312                         s390_dlr  (code, s390_r0, ins->sreg2);
3313                         s390_lr   (code, ins->dreg, s390_r0);
3314                         break;
3315                 case OP_REM_IMM:
3316                         if (s390_is_imm16 (ins->inst_imm)) {
3317                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3318                                 s390_lr   (code, s390_r0, ins->sreg1);
3319                         } else {
3320                                 s390_basr (code, s390_r13, 0);
3321                                 s390_j    (code, 4);
3322                                 s390_word (code, ins->inst_imm);
3323                                 s390_lr   (code, s390_r0, ins->sreg1);
3324                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3325                         }
3326                         s390_srda (code, s390_r0, 0, 32);
3327                         s390_dr   (code, s390_r0, ins->sreg2);
3328                         s390_lr   (code, ins->dreg, s390_r0);
3329                         break;
3330                 case CEE_OR:
3331                         if (ins->sreg1 == ins->dreg) {
3332                                 s390_or   (code, ins->dreg, ins->sreg2);
3333                         }
3334                         else {
3335                                 if (ins->sreg2 == ins->dreg) {
3336                                         s390_or  (code, ins->dreg, ins->sreg1);
3337                                 }
3338                                 else {
3339                                         s390_lr  (code, ins->dreg, ins->sreg1);
3340                                         s390_or  (code, ins->dreg, ins->sreg2);
3341                                 }
3342                         }
3343                         break;
3344                 case OP_OR_IMM:
3345                         if (s390_is_imm16 (ins->inst_imm)) {
3346                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3347                                 if (ins->dreg != ins->sreg1) {
3348                                         s390_lr   (code, ins->dreg, ins->sreg1);
3349                                 }
3350                                 s390_or   (code, ins->dreg, s390_r0);
3351                         } else {
3352                                 s390_bras (code, s390_r13, 4);
3353                                 s390_word (code, ins->inst_imm);
3354                                 if (ins->dreg != ins->sreg1) {
3355                                         s390_lr   (code, ins->dreg, ins->sreg1);
3356                                 }
3357                                 s390_o    (code, ins->dreg, 0, s390_r13, 0);
3358                         }
3359                         break;
3360                 case CEE_XOR:
3361                         if (ins->sreg1 == ins->dreg) {
3362                                 s390_xr   (code, ins->dreg, ins->sreg2);
3363                         }
3364                         else {
3365                                 if (ins->sreg2 == ins->dreg) {
3366                                         s390_xr  (code, ins->dreg, ins->sreg1);
3367                                 }
3368                                 else {
3369                                         s390_lr  (code, ins->dreg, ins->sreg1);
3370                                         s390_xr  (code, ins->dreg, ins->sreg2);
3371                                 }
3372                         }
3373                         break;
3374                 case OP_XOR_IMM:
3375                         if (s390_is_imm16 (ins->inst_imm)) {
3376                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3377                                 if (ins->dreg != ins->sreg1) {
3378                                         s390_lr   (code, ins->dreg, ins->sreg1);
3379                                 }
3380                                 s390_xr   (code, ins->dreg, s390_r0);
3381                         } else {
3382                                 s390_basr (code, s390_r13, 0);
3383                                 s390_j    (code, 4);
3384                                 s390_word (code, ins->inst_imm);
3385                                 if (ins->dreg != ins->sreg1) {
3386                                         s390_lr   (code, ins->dreg, ins->sreg1);
3387                                 }
3388                                 s390_x    (code, ins->dreg, 0, s390_r13, 4);
3389                         }
3390                         break;
3391                 case CEE_SHL:
3392                         if (ins->sreg1 != ins->dreg) {
3393                                 s390_lr   (code, ins->dreg, ins->sreg1);
3394                         }
3395                         s390_sll  (code, ins->dreg, ins->sreg2, 0);
3396                         break;
3397                 case OP_SHL_IMM:
3398                         if (ins->sreg1 != ins->dreg) {
3399                                 s390_lr   (code, ins->dreg, ins->sreg1);
3400                         }
3401                         s390_sll  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3402                         break;
3403                 case CEE_SHR:
3404                         if (ins->sreg1 != ins->dreg) {
3405                                 s390_lr   (code, ins->dreg, ins->sreg1);
3406                         }
3407                         s390_sra  (code, ins->dreg, ins->sreg2, 0);
3408                         break;
3409                 case OP_SHR_IMM:
3410                         if (ins->sreg1 != ins->dreg) {
3411                                 s390_lr   (code, ins->dreg, ins->sreg1);
3412                         }
3413                         s390_sra  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3414                         break;
3415                 case OP_SHR_UN_IMM:
3416                         if (ins->sreg1 != ins->dreg) {
3417                                 s390_lr   (code, ins->dreg, ins->sreg1);
3418                         }
3419                         s390_srl  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3420                         break;
3421                 case CEE_SHR_UN:
3422                         if (ins->sreg1 != ins->dreg) {
3423                                 s390_lr   (code, ins->dreg, ins->sreg1);
3424                         }
3425                         s390_srl  (code, ins->dreg, ins->sreg2, 0);
3426                         break;
3427                 case CEE_NOT:
3428                         if (ins->sreg1 != ins->dreg) {
3429                                 s390_lr   (code, ins->dreg, ins->sreg1);
3430                         }
3431                         s390_lhi (code, s390_r0, -1);
3432                         s390_xr  (code, ins->dreg, s390_r0);
3433                         break;
3434                 case CEE_NEG:
3435                         s390_lcr (code, ins->dreg, ins->sreg1);
3436                         break;
3437                 case CEE_MUL:
3438                         if (ins->sreg1 == ins->dreg) {
3439                                 s390_msr  (code, ins->dreg, ins->sreg2);
3440                         }
3441                         else {
3442                                 if (ins->sreg2 == ins->dreg) {
3443                                         s390_msr (code, ins->dreg, ins->sreg1);
3444                                 }
3445                                 else {
3446                                         s390_lr  (code, ins->dreg, ins->sreg1);
3447                                         s390_msr (code, ins->dreg, ins->sreg2);
3448                                 }
3449                         }
3450                         break;
3451                 case OP_MUL_IMM:
3452                         if (s390_is_imm16 (ins->inst_imm)) {
3453                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3454                         } else {
3455                                 s390_basr (code, s390_r13, 0);
3456                                 s390_j    (code, 4);
3457                                 s390_word (code, ins->inst_imm);
3458                                 if (ins->dreg != ins->sreg1) {
3459                                         s390_lr   (code, ins->dreg, ins->sreg1);
3460                                 }
3461                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3462                         }
3463                         s390_msr  (code, ins->dreg, s390_r13);
3464                         break;
3465                 case CEE_MUL_OVF:
3466                         s390_lhi  (code, s390_r0, 0);
3467                         s390_lr   (code, s390_r1, ins->sreg1);
3468                         s390_mr   (code, s390_r0, ins->sreg2);
3469                         s390_ltr  (code, s390_r0, s390_r0);
3470                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3471                         s390_lr   (code, ins->dreg, s390_r1);
3472                         break;
3473                 case CEE_MUL_OVF_UN:
3474                         s390_lhi  (code, s390_r0, 0);
3475                         s390_lr   (code, s390_r1, ins->sreg1);
3476                         s390_mlr  (code, s390_r0, ins->sreg2);
3477                         s390_ltr  (code, s390_r0, s390_r0);
3478                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3479                         s390_lr   (code, ins->dreg, s390_r1);
3480                         break;
3481                 case OP_LMUL:
3482                         s390_l    (code, s390_r0, 0, ins->sreg1, 4);
3483                         s390_lr   (code, s390_r14, s390_r0);
3484                         s390_srda (code, s390_r0, 0, 32);
3485                         s390_m    (code, s390_r0, 0, ins->sreg2, 4);
3486                         s390_srl  (code, s390_r14, 0, 31);
3487                         s390_a    (code, s390_r14, 0, ins->sreg1, 0);
3488                         s390_l    (code, s390_r13, 0, ins->sreg2, 0);
3489                         s390_srl  (code, s390_r13, 0, 31);
3490                         s390_ms   (code, s390_r13, 0, ins->sreg1, 4);
3491                         s390_ar   (code, s390_r14, s390_r13);
3492                         s390_st   (code, s390_r14, 0, ins->dreg, 0);
3493                         s390_st   (code, s390_r1, 0, ins->dreg, 4);
3494                         break;
3495                 case OP_ICONST:
3496                 case OP_SETREGIMM:
3497                         if (s390_is_imm16(ins->inst_c0)) {
3498                                 s390_lhi  (code, ins->dreg, ins->inst_c0);
3499                         } else {
3500                                 s390_basr (code, s390_r13, 0);
3501                                 s390_j    (code, 4);
3502                                 s390_word (code, ins->inst_c0);
3503                                 s390_l    (code, ins->dreg, 0, s390_r13, 4);
3504                         }
3505                         break;
3506                 case OP_AOTCONST:
3507                         s390_basr (code, s390_r13, 0);
3508                         s390_j    (code, 4);
3509                         mono_add_patch_info (cfg, code - cfg->native_code,
3510                                 (MonoJumpInfoType)ins->inst_i1, ins->inst_p0);
3511                         s390_word (code, 0);
3512                         s390_l    (code,ins->dreg, 0, s390_r13, 4);
3513                         break;
3514                 case CEE_CONV_I4:
3515                 case CEE_CONV_U4:
3516                 case OP_MOVE:
3517                 case OP_SETREG:
3518                         if (ins->dreg != ins->sreg1) {
3519                                 s390_lr (code, ins->dreg, ins->sreg1);
3520                         }
3521                         break;
3522                 case OP_SETLRET: {
3523                         int saved = ins->sreg1;
3524                         if (ins->sreg1 == s390_r2) {
3525                                 s390_lr (code, s390_r0, ins->sreg1);
3526                                 saved = s390_r0;
3527                         }
3528                         if (ins->sreg2 != s390_r2)
3529                                 s390_lr (code, s390_r2, ins->sreg2);
3530                         if (saved != s390_r3)
3531                                 s390_lr (code, s390_r3, saved);
3532                         break;
3533                 }
3534                 case OP_SETFREG:
3535                 case OP_FMOVE:
3536                         if (ins->dreg != ins->sreg1) {
3537                                 s390_ldr   (code, ins->dreg, ins->sreg1);
3538                         }
3539                         break;
3540                 case OP_FCONV_TO_R4:
3541                         s390_ledbr (code, ins->dreg, ins->sreg1);
3542                         break;
3543                 case CEE_JMP:
3544                         g_assert_not_reached ();
3545                         break;
3546                 case OP_CHECK_THIS:
3547                         /* ensure ins->sreg1 is not NULL */
3548                         s390_icm (code, s390_r0, 15, ins->sreg1, 0);
3549                         break;
3550                 case OP_FCALL:
3551                 case OP_LCALL:
3552                 case OP_VCALL:
3553                 case OP_VOIDCALL:
3554                 case CEE_CALL:
3555                         call = (MonoCallInst*)ins;
3556                         if (ins->flags & MONO_INST_HAS_METHOD)
3557                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_METHOD, call->method);
3558                         else
3559                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_ABS, call->fptr);
3560                         s390_brasl (code, s390_r14, 0);
3561                         break;
3562                 case OP_FCALL_REG:
3563                 case OP_LCALL_REG:
3564                 case OP_VCALL_REG:
3565                 case OP_VOIDCALL_REG:
3566                 case OP_CALL_REG:
3567                         s390_lr   (code, s390_r1, ins->sreg1);
3568                         s390_basr (code, s390_r14, s390_r1);
3569                         break;
3570                 case OP_FCALL_MEMBASE:
3571                 case OP_LCALL_MEMBASE:
3572                 case OP_VCALL_MEMBASE:
3573                 case OP_VOIDCALL_MEMBASE:
3574                 case OP_CALL_MEMBASE:
3575                         s390_l    (code, s390_r1, 0, ins->sreg1, ins->inst_offset);
3576                         s390_basr (code, s390_r14, s390_r1);
3577                         break;
3578                 case OP_OUTARG:
3579                         g_assert_not_reached ();
3580                         break;
3581                 case OP_LOCALLOC:
3582                         s390_lr   (code, s390_r1, ins->sreg1);
3583                         s390_ahi  (code, s390_r1, 14);
3584                         s390_srl  (code, s390_r1, 0, 3);
3585                         s390_sll  (code, s390_r1, 0, 3);
3586                         s390_l    (code, s390_r13, 0, STK_BASE, 0);
3587                         s390_lcr  (code, s390_r1, s390_r1);
3588                         s390_la   (code, STK_BASE, STK_BASE, s390_r1, 0);
3589                         s390_st   (code, s390_r13, 0, STK_BASE, 0);
3590                         s390_la   (code, ins->dreg, 0, STK_BASE, S390_MINIMAL_STACK_SIZE+7);
3591                         s390_srl  (code, ins->dreg, 0, 3);
3592                         s390_sll  (code, ins->dreg, 0, 3);
3593                         break;
3594                 case CEE_RET:
3595                         s390_br  (code, s390_r14);
3596                         break;
3597                 case CEE_THROW: {
3598                         s390_lr (code, s390_r2, ins->sreg1);
3599                         mono_add_patch_info (cfg, code-cfg->native_code, MONO_PATCH_INFO_INTERNAL_METHOD,
3600                                              (gpointer)"mono_arch_throw_exception");
3601                         s390_brasl (code, s390_r14, 0);
3602                         break;
3603                 }
3604                 case OP_START_HANDLER:
3605                         s390_lr   (code, s390_r0, s390_r14);
3606                         s390_st   (code, s390_r0, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3607                         break;
3608                 case OP_ENDFILTER:
3609                         if (ins->sreg1 != s390_r2)
3610                                 s390_lr (code, s390_r2, ins->sreg1);
3611                         s390_l   (code, STK_BASE, 0, STK_BASE, 0);
3612                         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
3613                         s390_br  (code, s390_r14);
3614                         break;
3615                 case CEE_ENDFINALLY:
3616                         s390_l   (code, s390_r14, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3617                         s390_br  (code, s390_r14);
3618                         break;
3619                 case OP_CALL_HANDLER:
3620                         mono_add_patch_info (cfg, code-cfg->native_code,
3621                                              MONO_PATCH_INFO_BB, ins->inst_target_bb);
3622                         s390_brasl (code, s390_r14, 0);
3623                         break;
3624                 case OP_LABEL:
3625                         ins->inst_c0 = code - cfg->native_code;
3626                         break;
3627                 case CEE_BR:
3628                         EMIT_UNCOND_BRANCH(ins);
3629                         break;
3630                 case OP_BR_REG:
3631                         s390_br  (code, ins->sreg1);
3632                         break;
3633                 case OP_CEQ:
3634                         s390_lhi (code, ins->dreg, 1);
3635                         s390_jz  (code, 4);
3636                         s390_lhi (code, ins->dreg, 0);
3637                         break;
3638                 case OP_CLT:
3639                         s390_lhi (code, ins->dreg, 1);
3640                         s390_jl  (code, 4);
3641                         s390_lhi (code, ins->dreg, 0);
3642                         break;
3643                 case OP_CLT_UN:
3644                         s390_lhi (code, ins->dreg, 1);
3645                         s390_jlo (code, 4);
3646                         s390_lhi (code, ins->dreg, 0);
3647                         break;
3648                 case OP_CGT:
3649                         s390_lhi (code, ins->dreg, 1);
3650                         s390_jh  (code, 4);
3651                         s390_lhi (code, ins->dreg, 0);
3652                         break;
3653                 case OP_CGT_UN:
3654                         s390_lhi (code, ins->dreg, 1);
3655                         s390_jho (code, 4);
3656                         s390_lhi (code, ins->dreg, 0);
3657                         break;
3658                 case OP_COND_EXC_EQ:
3659                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_EQ, ins->inst_p1);
3660                         break;
3661                 case OP_COND_EXC_NE_UN:
3662                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NE, ins->inst_p1);
3663                         break;
3664                 case OP_COND_EXC_LT:
3665                 case OP_COND_EXC_LT_UN:
3666                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LT, ins->inst_p1);
3667                         break;
3668                 case OP_COND_EXC_GT:
3669                 case OP_COND_EXC_GT_UN:
3670                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GT, ins->inst_p1);
3671                         break;
3672                 case OP_COND_EXC_GE:
3673                 case OP_COND_EXC_GE_UN:
3674                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GE, ins->inst_p1);
3675                         break;
3676                 case OP_COND_EXC_LE:
3677                 case OP_COND_EXC_LE_UN:
3678                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LE, ins->inst_p1);
3679                         break;
3680                 case OP_COND_EXC_OV:
3681                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_OV, ins->inst_p1);
3682                         break;
3683                 case OP_COND_EXC_NO:
3684                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NO, ins->inst_p1);
3685                         break;
3686                 case OP_COND_EXC_C:
3687                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_CY, ins->inst_p1);
3688                         break;
3689                 case OP_COND_EXC_NC:
3690                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NC, ins->inst_p1);
3691                         break;
3692                 case CEE_BEQ:
3693                         EMIT_COND_BRANCH (ins, S390_CC_EQ);
3694                         break;
3695                 case CEE_BNE_UN:
3696                         EMIT_COND_BRANCH (ins, S390_CC_NE);
3697                         break;
3698                 case CEE_BLT:
3699                 case CEE_BLT_UN:
3700                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3701                         break;
3702                 case CEE_BGT:
3703                 case CEE_BGT_UN:
3704                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3705                         break;
3706                 case CEE_BGE:
3707                 case CEE_BGE_UN:
3708                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3709                         break;
3710                 case CEE_BLE:
3711                 case CEE_BLE_UN:
3712                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3713                         break;
3714
3715                 /* floating point opcodes */
3716                 case OP_R8CONST:
3717                         if (*((float *) ins->inst_p0) == 0) {
3718                                 s390_lzdr (code, ins->dreg);
3719                         } else {
3720                                 s390_basr  (code, s390_r13, 0);
3721                                 s390_j     (code, 4);
3722                                 s390_word  (code, ins->inst_p0);
3723                                 s390_l     (code, s390_r13, 0, s390_r13, 4);
3724                                 s390_ld    (code, ins->dreg, 0, s390_r13, 0);
3725                         }
3726                         break;
3727                 case OP_R4CONST:
3728                         if (*((float *) ins->inst_p0) == 0) {
3729                                 s390_lzer (code, ins->dreg);
3730                         } else {
3731                                 s390_basr (code, s390_r13, 0);
3732                                 s390_j    (code, 4);
3733                                 s390_word (code, ins->inst_p0);
3734                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3735                                 s390_le   (code, ins->dreg, 0, s390_r13, 0);
3736                                 s390_ldebr(code, ins->dreg, ins->dreg);
3737                         }
3738                         break;
3739                 case OP_STORER8_MEMBASE_REG:
3740                         if (s390_is_uimm12(ins->inst_offset)) {
3741                                 s390_std  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3742                         } else {
3743                                 s390_basr (code, s390_r13, 0);
3744                                 s390_j    (code, 4);
3745                                 s390_word (code, ins->inst_offset);
3746                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3747                                 s390_std  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3748                         }
3749                         break;
3750                 case OP_LOADR8_MEMBASE:
3751                         if (s390_is_uimm12(ins->inst_offset)) {
3752                                 s390_ld   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3753                         } else {
3754                                 s390_basr (code, s390_r13, 0);
3755                                 s390_j    (code, 4);
3756                                 s390_word (code, ins->inst_offset);
3757                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3758                                 s390_ld   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3759                         }
3760                         break;
3761                 case OP_STORER4_MEMBASE_REG:
3762                         if (s390_is_uimm12(ins->inst_offset)) {
3763                                 s390_ledbr(code, s390_f0, ins->sreg1);
3764                                 s390_ste  (code, s390_f0, 0, ins->inst_destbasereg, ins->inst_offset);
3765                         } else {
3766                                 s390_basr (code, s390_r13, 0);
3767                                 s390_j    (code, 4);
3768                                 s390_word (code, ins->inst_offset);
3769                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3770                                 s390_ledbr(code, s390_f0, ins->sreg1);
3771                                 s390_ste  (code, s390_f0, s390_r13, ins->inst_destbasereg, 0);
3772                         }
3773                         break;
3774                 case OP_LOADR4_MEMBASE:
3775                         if (s390_is_uimm12(ins->inst_offset)) {
3776                                 s390_le   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3777                         } else {
3778                                 s390_basr (code, s390_r13, 0);
3779                                 s390_j    (code, 4);
3780                                 s390_word (code, ins->inst_offset);
3781                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3782                                 s390_le   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3783                         }
3784                         s390_ldebr (code, ins->dreg, ins->dreg);
3785                         break;
3786                 case CEE_CONV_R_UN:
3787                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3788                         s390_ltr   (code, ins->sreg1, ins->sreg1);
3789                         s390_jnl   (code, 12);
3790                         s390_basr  (code, s390_r13, 0);
3791                         s390_j     (code, 6);
3792                         s390_word  (code, 0x41f00000);
3793                         s390_word  (code, 0);
3794                         s390_adb   (code, ins->dreg, 0, s390_r13, 4);
3795                         break;
3796                 case CEE_CONV_R4:
3797                         s390_cefbr (code, ins->dreg, ins->sreg1);
3798                         break;
3799                 case CEE_CONV_R8:
3800                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3801                         break;
3802                 case OP_FCONV_TO_I1:
3803                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, TRUE);
3804                         break;
3805                 case OP_FCONV_TO_U1:
3806                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, FALSE);
3807                         break;
3808                 case OP_FCONV_TO_I2:
3809                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, TRUE);
3810                         break;
3811                 case OP_FCONV_TO_U2:
3812                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, FALSE);
3813                         break;
3814                 case OP_FCONV_TO_I4:
3815                 case OP_FCONV_TO_I:
3816                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, TRUE);
3817                         break;
3818                 case OP_FCONV_TO_U4:
3819                 case OP_FCONV_TO_U:
3820                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, FALSE);
3821                         break;
3822                 case OP_FCONV_TO_I8:
3823                 case OP_FCONV_TO_U8:
3824                         g_assert_not_reached ();
3825                         /* Implemented as helper calls */
3826                         break;
3827                 case OP_LCONV_TO_R_UN:
3828                         g_assert_not_reached ();
3829                         /* Implemented as helper calls */
3830                         break;
3831                 case OP_LCONV_TO_OVF_I: {
3832                         /* Valid ints: 0xffffffff:8000000 to 00000000:0x7f000000 */
3833                         short int *o[5];
3834                         s390_ltr  (code, ins->sreg2, ins->sreg2);
3835                         s390_jnl  (code, 0); CODEPTR(code, o[0]);
3836                         s390_ltr  (code, ins->sreg1, ins->sreg1);
3837                         s390_jnl  (code, 0); CODEPTR(code, o[1]);
3838                         s390_lhi  (code, s390_r13, -1);
3839                         s390_cr   (code, ins->sreg1, s390_r13);
3840                         s390_jnz  (code, 0); CODEPTR(code, o[2]);
3841                         if (ins->dreg != ins->sreg2)
3842                                 s390_lr   (code, ins->dreg, ins->sreg2);
3843                         s390_j    (code, 0); CODEPTR(code, o[3]);
3844                         PTRSLOT(code, o[0]);
3845                         s390_jz   (code, 0); CODEPTR(code, o[4]);
3846                         PTRSLOT(code, o[1]);
3847                         PTRSLOT(code, o[2]);
3848                         mono_add_patch_info (cfg, code - cfg->native_code,
3849                                              MONO_PATCH_INFO_EXC, "OverflowException");
3850                         s390_brasl (code, s390_r14, 0);
3851                         PTRSLOT(code, o[3]);
3852                         PTRSLOT(code, o[4]);
3853                         break;
3854                 }
3855                 case OP_SQRT:
3856                         s390_sqdbr (code, ins->dreg, ins->sreg1);
3857                         break;
3858                 case OP_FADD:
3859                         if (ins->dreg == ins->sreg1)
3860                                 s390_adbr (code, ins->dreg, ins->sreg2);
3861                         else {
3862                                 if (ins->dreg == ins->sreg2)
3863                                         s390_adbr (code, ins->dreg, ins->sreg1);
3864                                 else {
3865                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3866                                         s390_adbr (code, ins->dreg, ins->sreg2);
3867                                 }
3868                         }
3869                         break;
3870                 case OP_FSUB:
3871                         if (ins->dreg == ins->sreg1)
3872                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3873                         else {
3874                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3875                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3876                         }
3877                         break;
3878                 case OP_FMUL:
3879                         if (ins->dreg == ins->sreg1)
3880                                 s390_mdbr (code, ins->dreg, ins->sreg2);
3881                         else {
3882                                 if (ins->dreg == ins->sreg2)
3883                                         s390_mdbr (code, ins->dreg, ins->sreg1);
3884                                 else {
3885                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3886                                         s390_mdbr (code, ins->dreg, ins->sreg2);
3887                                 }
3888                         }
3889                         break;
3890                 case OP_FDIV:
3891                         if (ins->dreg == ins->sreg1)
3892                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3893                         else {
3894                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3895                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3896                         }
3897                         break;
3898                 case OP_FNEG:
3899                         s390_lcdbr (code, ins->dreg, ins->sreg1);
3900                         break;
3901                 case OP_FREM:
3902                         if (ins->dreg != ins->sreg1) {
3903                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3904                         }
3905                         s390_didbr (code, ins->dreg, ins->sreg2, 5, s390_f15);
3906                         break;
3907                 case OP_FCOMPARE:
3908                         s390_cdbr (code, ins->sreg1, ins->sreg2);
3909                         break;
3910                 case OP_FCEQ:
3911                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3912                         s390_lhi   (code, ins->dreg, 1);
3913                         s390_je    (code, 4);
3914                         s390_lhi   (code, ins->dreg, 0);
3915                         break;
3916                 case OP_FCLT:
3917                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3918                         s390_lhi   (code, ins->dreg, 1);
3919                         s390_jl    (code, 4);
3920                         s390_lhi   (code, ins->dreg, 0);
3921                         break;
3922                 case OP_FCLT_UN:
3923                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3924                         s390_lhi   (code, ins->dreg, 1);
3925                         s390_jlo   (code, 4);
3926                         s390_lhi   (code, ins->dreg, 0);
3927                         break;
3928                 case OP_FCGT:
3929                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3930                         s390_lhi   (code, ins->dreg, 1);
3931                         s390_jh    (code, 4);
3932                         s390_lhi   (code, ins->dreg, 0);
3933                         break;
3934                 case OP_FCGT_UN:
3935                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3936                         s390_lhi   (code, ins->dreg, 1);
3937                         s390_jho   (code, 4);
3938                         s390_lhi   (code, ins->dreg, 0);
3939                         break;
3940                 case OP_FBEQ:
3941                         EMIT_COND_BRANCH (ins, S390_CC_EQ|S390_CC_OV);
3942                         break;
3943                 case OP_FBNE_UN:
3944                         EMIT_COND_BRANCH (ins, S390_CC_NE|S390_CC_OV);
3945                         break;
3946                 case OP_FBLT:
3947                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3948                         break;
3949                 case OP_FBLT_UN:
3950                         EMIT_COND_BRANCH (ins, S390_CC_LT|S390_CC_OV);
3951                         break;
3952                 case OP_FBGT:
3953                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3954                         break;
3955                 case OP_FBGT_UN:
3956                         EMIT_COND_BRANCH (ins, S390_CC_GT|S390_CC_OV);
3957                         break;
3958                 case OP_FBGE:
3959                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3960                         break;
3961                 case OP_FBGE_UN:
3962                         EMIT_COND_BRANCH (ins, S390_CC_GE|S390_CC_OV);
3963                         break;
3964                 case OP_FBLE:
3965                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3966                         break;
3967                 case OP_FBLE_UN:
3968                         EMIT_COND_BRANCH (ins, S390_CC_LE|S390_CC_OV);
3969                         break;
3970                 case CEE_CKFINITE: {
3971                         short *o;
3972                         s390_lhi  (code, s390_r13, 0xfc0);
3973                         s390_tcdb (code, ins->sreg1, 0, s390_r13, 0);
3974                         s390_jz   (code, 0); CODEPTR(code, o);
3975                         mono_add_patch_info (cfg, code - cfg->native_code + 2,
3976                                              MONO_PATCH_INFO_EXC, "ArithmeticException");
3977                         s390_brasl (code, s390_r14,0);
3978                         PTRSLOT(code, o);
3979                         break;
3980                 }
3981                 default:
3982                         g_warning ("unknown opcode %s in %s()\n", mono_inst_name (ins->opcode), __FUNCTION__);
3983                         g_assert_not_reached ();
3984                 }
3985
3986                 if ((cfg->opt & MONO_OPT_BRANCH) && ((code - cfg->native_code - offset) > max_len)) {
3987                         g_warning ("wrong maximal instruction length of instruction %s (expected %d, got %d)",
3988                                    mono_inst_name (ins->opcode), max_len, code - cfg->native_code - offset);
3989                         g_assert_not_reached ();
3990                 }
3991
3992                 cpos += max_len;
3993
3994                 last_ins = ins;
3995                 last_offset = offset;
3996
3997                 ins = ins->next;
3998         }
3999
4000         cfg->code_len = code - cfg->native_code;
4001 }
4002
4003 /*========================= End of Function ========================*/
4004
4005 /*------------------------------------------------------------------*/
4006 /*                                                                  */
4007 /* Name         - mono_arch_register_lowlevel_calls                 */
4008 /*                                                                  */
4009 /* Function     - Register routines to help with --trace operation. */
4010 /*                                                                  */
4011 /*------------------------------------------------------------------*/
4012
4013 void
4014 mono_arch_register_lowlevel_calls (void)
4015 {
4016         mono_register_jit_icall (enter_method, "mono_enter_method", NULL, TRUE);
4017         mono_register_jit_icall (leave_method, "mono_leave_method", NULL, TRUE);
4018 }
4019
4020 /*========================= End of Function ========================*/
4021
4022 /*------------------------------------------------------------------*/
4023 /*                                                                  */
4024 /* Name         - mono_arch_patch_code                              */
4025 /*                                                                  */
4026 /* Function     - Process the patch data created during the         */
4027 /*                instruction build process. This resolves jumps,   */
4028 /*                calls, variables etc.                             */
4029 /*                                                                  */
4030 /*------------------------------------------------------------------*/
4031
4032 void
4033 mono_arch_patch_code (MonoMethod *method, MonoDomain *domain, guint8 *code, MonoJumpInfo *ji, gboolean run_cctors)
4034 {
4035         MonoJumpInfo *patch_info;
4036
4037         for (patch_info = ji; patch_info; patch_info = patch_info->next) {
4038                 unsigned char *ip = patch_info->ip.i + code;
4039                 gint32 target = 0;
4040
4041                 switch (patch_info->type) {
4042                 case MONO_PATCH_INFO_BB:
4043                         target = S390_RELATIVE((patch_info->data.bb->native_offset+code),
4044                                                ip);
4045                         ip    += 2;     /* Skip over op-code */
4046                         break;
4047                 case MONO_PATCH_INFO_ABS:
4048                         target = S390_RELATIVE(patch_info->data.target, ip);
4049                         ip    += 2;     /* Skip over op-code */
4050                         break;
4051                 case MONO_PATCH_INFO_LABEL:
4052                         target = S390_RELATIVE((patch_info->data.inst->inst_c0+code),ip);
4053                         ip    += 2;     /* Skip over op-code */
4054                         break;
4055                 case MONO_PATCH_INFO_IP:
4056                         target = ip;
4057                         continue;
4058                 case MONO_PATCH_INFO_METHOD_REL:
4059                         g_assert_not_reached ();
4060                         *((gpointer *)(ip)) = code + patch_info->data.offset;
4061                         continue;
4062                 case MONO_PATCH_INFO_INTERNAL_METHOD: {
4063                         MonoJitICallInfo *mi = mono_find_jit_icall_by_name (patch_info->data.name);
4064                         if (!mi) {
4065                                 g_warning ("unknown MONO_PATCH_INFO_INTERNAL_METHOD %s", patch_info->data.name);
4066                                 g_assert_not_reached ();
4067                         }
4068                         target = S390_RELATIVE(mono_icall_get_wrapper (mi), ip);
4069                         ip    += 2;     /* Skip over op-code */
4070                         break;
4071                 }
4072                 case MONO_PATCH_INFO_METHOD_JUMP:
4073                         g_assert_not_reached ();
4074                         break;
4075                 case MONO_PATCH_INFO_METHOD:
4076                         if (patch_info->data.method == method) {
4077                                 target = S390_RELATIVE(code, ip);
4078                         } else {
4079                                 /* get the trampoline to the method from the domain */
4080                                 target = S390_RELATIVE(mono_arch_create_jit_trampoline (patch_info->data.method), ip);
4081                                 target = mono_arch_create_jit_trampoline(patch_info->data.method);
4082                                 target = S390_RELATIVE(target, ip);
4083                         }
4084                         ip    += 2;     /* Skip over op-code */
4085                         break;
4086                 case MONO_PATCH_INFO_SWITCH: {
4087                         gpointer *table = (gpointer *)patch_info->data.target;
4088                         int i;
4089                         /*------------------------------------------------------*/
4090                         /* ip is pointing at the basr r13,0/j +4 instruction    */
4091                         /* the vtable value follows this (i.e. ip+6)            */
4092                         /*------------------------------------------------------*/
4093                         *((gconstpointer *)(ip+6)) = table;
4094
4095                         for (i = 0; i < patch_info->table_size; i++) {
4096                                 table [i] = (int)patch_info->data.table [i] + code;
4097                         }
4098                         continue;
4099                 }
4100                 case MONO_PATCH_INFO_METHODCONST:
4101                 case MONO_PATCH_INFO_CLASS:
4102                 case MONO_PATCH_INFO_IMAGE:
4103                 case MONO_PATCH_INFO_FIELD:
4104                         target = S390_RELATIVE(patch_info->data.target, ip);
4105                         continue;
4106                 case MONO_PATCH_INFO_R4:
4107                 case MONO_PATCH_INFO_R8:
4108                         g_assert_not_reached ();
4109                         *((gconstpointer *)(ip + 2)) = patch_info->data.target;
4110                         continue;
4111                 case MONO_PATCH_INFO_IID:
4112                         mono_class_init (patch_info->data.klass);
4113                         target = S390_RELATIVE(patch_info->data.klass->interface_id, ip);
4114                         continue;
4115                 case MONO_PATCH_INFO_VTABLE:
4116                         target = S390_RELATIVE(mono_class_vtable (domain, patch_info->data.klass),ip);
4117                         ip += 2;
4118                         continue;
4119                 case MONO_PATCH_INFO_CLASS_INIT:
4120                         target = S390_RELATIVE(mono_create_class_init_trampoline (mono_class_vtable (domain, patch_info->data.klass)), ip);
4121                         ip += 2;
4122                         break;
4123                 case MONO_PATCH_INFO_SFLDA: {
4124                         MonoVTable *vtable = mono_class_vtable (domain, patch_info->data.field->parent);
4125                         if (!vtable->initialized && !(vtable->klass->flags & TYPE_ATTRIBUTE_BEFORE_FIELD_INIT) && mono_class_needs_cctor_run (vtable->klass, method))
4126                                 /* Done by the generated code */
4127                                 ;
4128                         else {
4129                                 if (run_cctors)
4130                                         mono_runtime_class_init (vtable);
4131                         }
4132                         target = S390_RELATIVE((char*)vtable->data + patch_info->data.field->offset, ip);
4133                         ip += 2;
4134                         continue;
4135                 }
4136                 case MONO_PATCH_INFO_EXC_NAME:
4137                         *((gconstpointer *)(ip)) = patch_info->data.name;
4138                         continue;
4139                 case MONO_PATCH_INFO_LDSTR:
4140                         target = mono_ldstr (domain, patch_info->data.token->image,
4141                                              mono_metadata_token_index (patch_info->data.token->token));
4142                         continue;
4143                 case MONO_PATCH_INFO_TYPE_FROM_HANDLE: {
4144                         gpointer handle;
4145                         MonoClass *handle_class;
4146
4147                         handle = mono_ldtoken (patch_info->data.token->image,
4148                                                patch_info->data.token->token,
4149                                                &handle_class, NULL);
4150                         mono_class_init (handle_class);
4151                         mono_class_init (mono_class_from_mono_type (handle));
4152
4153                         target = handle;
4154                         continue;
4155                 }
4156                 case MONO_PATCH_INFO_LDTOKEN: {
4157                         gpointer handle;
4158                         MonoClass *handle_class;
4159
4160                         handle = mono_ldtoken (patch_info->data.token->image,
4161                                                patch_info->data.token->token,
4162                                                &handle_class, NULL);
4163                         mono_class_init (handle_class);
4164
4165                         target = handle;
4166                         continue;
4167                 }
4168                 case MONO_PATCH_INFO_EXC:
4169                         /* everything is dealt with at epilog output time */
4170                         continue;
4171                 default:
4172                         g_assert_not_reached ();
4173                 }
4174                 s390_patch (ip, target);
4175         }
4176 }
4177
4178 /*========================= End of Function ========================*/
4179
4180 /*------------------------------------------------------------------*/
4181 /*                                                                  */
4182 /* Name         - mono_arch_max_epilog_size                         */
4183 /*                                                                  */
4184 /* Function     - Determine the maximum size of the epilog code.    */
4185 /*                                                                  */
4186 /*------------------------------------------------------------------*/
4187
4188 int
4189 mono_arch_max_epilog_size (MonoCompile *cfg)
4190 {
4191         int max_epilog_size = 96;
4192         MonoJumpInfo *patch_info;
4193
4194         if (cfg->method->save_lmf)
4195                 max_epilog_size += 128;
4196
4197         if (mono_jit_trace_calls != NULL)
4198                 max_epilog_size += 128;
4199
4200         if (cfg->prof_options & MONO_PROFILE_ENTER_LEAVE)
4201                 max_epilog_size += 128;
4202
4203         /* count the number of exception infos */
4204
4205         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4206                 if (patch_info->type == MONO_PATCH_INFO_EXC)
4207                         max_epilog_size += 26;
4208         }
4209
4210         return max_epilog_size;
4211 }
4212
4213 /*========================= End of Function ========================*/
4214
4215 /*------------------------------------------------------------------*/
4216 /*                                                                  */
4217 /* Name         - mono_arch_emit_prolog                             */
4218 /*                                                                  */
4219 /* Function     - Create the instruction sequence for a function    */
4220 /*                prolog.                                           */
4221 /*                                                                  */
4222 /*------------------------------------------------------------------*/
4223
4224 guint8 *
4225 mono_arch_emit_prolog (MonoCompile *cfg)
4226 {
4227         MonoMethod *method = cfg->method;
4228         MonoBasicBlock *bb;
4229         MonoMethodSignature *sig;
4230         MonoInst *inst;
4231         int alloc_size, pos, max_offset, i, lmfOffset;
4232         guint8 *code;
4233         CallInfo *cinfo;
4234         size_data sz;
4235         int tracing = 0;
4236
4237         if (mono_jit_trace_calls != NULL && mono_trace_eval (method))
4238                 tracing = 1;
4239
4240         cfg->code_size   = 256;
4241         cfg->native_code = code = g_malloc (cfg->code_size);
4242
4243         s390_stm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4244
4245         if (cfg->flags & MONO_CFG_HAS_ALLOCA) {
4246                 cfg->used_int_regs |= 1 << 11;
4247         }
4248
4249         alloc_size = cfg->stack_offset;
4250 //      if (tracing)
4251 //              alloc_size += S390_TRACE_STACK_SIZE;
4252 //      pos = 0;
4253         /* reserve room to save return value */
4254 //      if (tracing)
4255 //              pos += 8;
4256
4257 //      alloc_size += pos;
4258
4259 //      if (method->save_lmf)
4260 //              alloc_size += sizeof(MonoLMF);
4261
4262 //      alloc_size = S390_ALIGN(alloc_size, S390_STACK_ALIGNMENT);
4263
4264         cfg->stack_usage = alloc_size;
4265         s390_lr   (code, s390_r11, STK_BASE);
4266         if (s390_is_imm16 (-alloc_size)) {
4267                 s390_ahi  (code, STK_BASE, -alloc_size);
4268         } else {
4269                 int stackSize = alloc_size;
4270                 while (stackSize > 32767) {
4271                         s390_ahi  (code, STK_BASE, -32767);
4272                         stackSize -= 32767;
4273                 }
4274                 s390_ahi  (code, STK_BASE, -stackSize);
4275         }
4276         s390_st   (code, s390_r11, 0, STK_BASE, 0);
4277
4278         if (cfg->flags & MONO_CFG_HAS_ALLOCA)
4279                 s390_lr (code, s390_r11, STK_BASE);
4280
4281         /* compute max_offset in order to use short forward jumps
4282          * we always do it on s390 because the immediate displacement
4283          * for jumps is too small
4284          */
4285         max_offset = 0;
4286         for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
4287                 MonoInst *ins = bb->code;
4288                 bb->max_offset = max_offset;
4289
4290                 if (cfg->prof_options & MONO_PROFILE_COVERAGE)
4291                         max_offset += 6;
4292
4293                 while (ins) {
4294                         max_offset += ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
4295                         ins = ins->next;
4296                 }
4297         }
4298
4299         /* load arguments allocated to register from the stack */
4300         sig = method->signature;
4301         pos = 0;
4302
4303         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
4304
4305         if (cinfo->struct_ret) {
4306                 ArgInfo *ainfo = &cinfo->ret;
4307                 inst         = cfg->ret;
4308                 inst->unused = ainfo->vtsize;
4309                 s390_st (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4310         }
4311
4312         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
4313                 ArgInfo *ainfo = cinfo->args + i;
4314                 inst = cfg->varinfo [pos];
4315
4316                 if (inst->opcode == OP_REGVAR) {
4317                         if (ainfo->regtype == RegTypeGeneral)
4318                                 s390_lr (code, inst->dreg, ainfo->reg);
4319                         else if (ainfo->regtype == RegTypeFP) {
4320                                 if (ainfo->size == 4) {
4321                                         s390_ledbr (code, inst->dreg, ainfo->reg);
4322                                 } else {
4323                                         s390_ldr   (code, inst->dreg, ainfo->reg);
4324                                 }
4325                         }
4326                         else if (ainfo->regtype == RegTypeBase) {
4327                                 s390_lr  (code, s390_r13, STK_BASE);
4328                                 s390_ahi (code, s390_r13, alloc_size);
4329                                 s390_l   (code, inst->dreg, 0, s390_r13, ainfo->offset);
4330                         } else
4331                                 g_assert_not_reached ();
4332
4333                         if (cfg->verbose_level > 2)
4334                                 g_print ("Argument %d assigned to register %s\n",
4335                                          pos, mono_arch_regname (inst->dreg));
4336                 } else {
4337                         if (ainfo->regtype == RegTypeGeneral) {
4338                                 if (!((ainfo->reg >= 2) && (ainfo->reg <= 6)))
4339                                         g_assert_not_reached();
4340                                 switch (ainfo->size) {
4341                                 case 1:
4342                                         s390_stc (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4343                                         break;
4344                                 case 2:
4345                                         s390_sth (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4346                                         break;
4347                                 case 8:
4348                                         s390_stm (code, ainfo->reg, ainfo->reg + 1,
4349                                                   inst->inst_basereg, inst->inst_offset);
4350                                         break;
4351                                 default:
4352                                         s390_st  (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4353                                 }
4354                         } else if (ainfo->regtype == RegTypeBase) {
4355                         } else if (ainfo->regtype == RegTypeFP) {
4356                                 if (ainfo->size == 8)
4357                                         s390_std (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4358                                 else if (ainfo->size == 4)
4359                                         s390_ste (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4360                                 else
4361                                         g_assert_not_reached ();
4362                         } else if (ainfo->regtype == RegTypeStructByVal) {
4363                                 int doffset = inst->inst_offset;
4364                                 int reg;
4365                                 if (ainfo->reg != STK_BASE)
4366                                         reg = ainfo->reg;
4367                                 else {
4368                                         reg = s390_r0;
4369                                         s390_lr  (code, s390_r13, STK_BASE);
4370                                         s390_ahi (code, s390_r13, alloc_size);
4371                                 }
4372                                 switch (ainfo->size) {
4373                                         case 1:
4374                                                 if (ainfo->reg == STK_BASE)
4375                                                         s390_ic  (code, reg, 0, s390_r13, ainfo->offset+3);
4376                                                 s390_stc (code, reg, 0, inst->inst_basereg, doffset);
4377                                                 break;
4378                                         case 2:
4379                                                 if (ainfo->reg == STK_BASE)
4380                                                         s390_lh  (code, reg, 0, s390_r13, ainfo->offset+2);
4381                                                 s390_sth (code, reg, 0, inst->inst_basereg, doffset);
4382                                                 break;
4383                                         case 4:
4384                                                 if (ainfo->reg == STK_BASE)
4385                                                         s390_l   (code, reg, 0, s390_r13, ainfo->offset);
4386                                                 s390_st  (code, reg, 0, inst->inst_basereg, doffset);
4387                                                 break;
4388                                         case 8:
4389                                                 if (ainfo->reg == STK_BASE)
4390                                                         s390_lm  (code, s390_r0, s390_r1, s390_r13, ainfo->offset);
4391                                                 s390_stm (code, reg, reg+1, inst->inst_basereg, doffset);
4392                                                 break;
4393                                 }
4394                         } else if (ainfo->regtype == RegTypeStructByAddr) {
4395                                 code = emit_memcpy (code, ainfo->vtsize,
4396                                                     inst->inst_basereg, inst->inst_offset, ainfo->reg, 0);
4397                         } else
4398                                 g_assert_not_reached ();
4399                 }
4400                 pos++;
4401         }
4402
4403         if (method->save_lmf) {
4404                 /*---------------------------------------------------------------*/
4405                 /* Preserve the parameter registers while we fix up the lmf      */
4406                 /*---------------------------------------------------------------*/
4407                 s390_lr (code, s390_r7, s390_r2);
4408                 s390_lr (code, s390_r8, s390_r3);
4409                 s390_lr (code, s390_r9, s390_r4);
4410                 s390_lr (code, s390_r10, s390_r5);
4411
4412                 mono_add_patch_info (cfg, code - cfg->native_code,
4413                                      MONO_PATCH_INFO_INTERNAL_METHOD,
4414                                      (gpointer)"mono_get_lmf_addr");
4415                 /*---------------------------------------------------------------*/
4416                 /* On return from this call r2 have the address of the &lmf      */
4417                 /*---------------------------------------------------------------*/
4418                 s390_brasl (code, s390_r14, 0);
4419
4420                 /*---------------------------------------------------------------*/
4421                 /* we build the MonoLMF structure on the stack - see mini-s390.h */
4422                 /*---------------------------------------------------------------*/
4423                 lmfOffset = alloc_size - sizeof(MonoLMF);
4424
4425                 s390_lr    (code, s390_r13, cfg->frame_reg);
4426                 s390_ahi   (code, s390_r13, lmfOffset);
4427
4428                 /*---------------------------------------------------------------*/
4429                 /* Set lmf.lmf_addr = jit_tls->lmf                               */
4430                 /*---------------------------------------------------------------*/
4431                 s390_st    (code, s390_r2, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4432
4433                 /*---------------------------------------------------------------*/
4434                 /* Get current lmf                                               */
4435                 /*---------------------------------------------------------------*/
4436                 s390_l     (code, s390_r0, 0, s390_r2, 0);
4437
4438                 /*---------------------------------------------------------------*/
4439                 /* Set our lmf as the current lmf                                */
4440                 /*---------------------------------------------------------------*/
4441                 s390_st    (code, s390_r13, 0, s390_r2, 0);
4442
4443                 /*---------------------------------------------------------------*/
4444                 /* Have our lmf.previous_lmf point to the last lmf               */
4445                 /*---------------------------------------------------------------*/
4446                 s390_st    (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4447
4448                 /*---------------------------------------------------------------*/
4449                 /* save method info                                              */
4450                 /*---------------------------------------------------------------*/
4451                 s390_basr  (code, s390_r1, 0);
4452                 s390_j     (code, 4);
4453                 s390_word  (code, method);
4454                 s390_l     (code, s390_r1, 0, s390_r1, 4);
4455                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, method));
4456
4457                 /*---------------------------------------------------------------*/
4458                 /* save the current IP                                           */
4459                 /*---------------------------------------------------------------*/
4460                 s390_lr    (code, s390_r1, cfg->frame_reg);
4461                 s390_ahi   (code, s390_r1, alloc_size);
4462                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
4463                 s390_l     (code, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
4464                 s390_la    (code, s390_r1, 0, s390_r1, 0);
4465                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
4466
4467                 /*---------------------------------------------------------------*/
4468                 /* Restore the parameter registers now that we've set up the lmf */
4469                 /*---------------------------------------------------------------*/
4470                 s390_lr (code, s390_r2, s390_r7);
4471                 s390_lr (code, s390_r3, s390_r8);
4472                 s390_lr (code, s390_r4, s390_r9);
4473                 s390_lr (code, s390_r5, s390_r10);
4474         }
4475
4476         if (tracing)
4477                 code = mono_arch_instrument_prolog (cfg, enter_method, code, TRUE);
4478
4479         cfg->code_len = code - cfg->native_code;
4480         g_free (cinfo);
4481
4482         return code;
4483 }
4484
4485 /*========================= End of Function ========================*/
4486
4487 /*------------------------------------------------------------------*/
4488 /*                                                                  */
4489 /* Name         - mono_arch_emit_epilog                             */
4490 /*                                                                  */
4491 /* Function     - Emit the instructions for a function epilog.      */
4492 /*                                                                  */
4493 /*------------------------------------------------------------------*/
4494
4495 void
4496 mono_arch_emit_epilog (MonoCompile *cfg)
4497 {
4498         MonoJumpInfo *patch_info;
4499         MonoMethod *method = cfg->method;
4500         MonoMethodSignature *sig = method->signature;
4501         MonoInst *inst;
4502         int i, lmfOffset, tracing = 0;
4503         guint8 *code;
4504
4505         code = cfg->native_code + cfg->code_len;
4506
4507         if (mono_jit_trace_calls != NULL && mono_trace_eval (method)) {
4508                 code = mono_arch_instrument_epilog (cfg, leave_method, code, TRUE);
4509                 tracing = 1;
4510         }
4511
4512         if (method->save_lmf) {
4513                 s390_lr  (code, s390_r13, cfg->frame_reg);
4514
4515                 lmfOffset = cfg->stack_usage -  sizeof(MonoLMF);
4516
4517                 /*-------------------------------------------------*/
4518                 /* r13 = my lmf                                    */
4519                 /*-------------------------------------------------*/
4520                 s390_ahi (code, s390_r13, lmfOffset);
4521
4522                 /*-------------------------------------------------*/
4523                 /* r6 = &jit_tls->lmf                              */
4524                 /*-------------------------------------------------*/
4525                 s390_l   (code, s390_r6, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4526
4527                 /*-------------------------------------------------*/
4528                 /* r0 = lmf.previous_lmf                           */
4529                 /*-------------------------------------------------*/
4530                 s390_l   (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4531
4532                 /*-------------------------------------------------*/
4533                 /* jit_tls->lmf = previous_lmf                     */
4534                 /*-------------------------------------------------*/
4535                 s390_l   (code, s390_r13, 0, s390_r6, 0);
4536                 s390_st  (code, s390_r0, 0, s390_r6, 0);
4537         }
4538
4539         if (cfg->frame_reg != STK_BASE)
4540                 s390_lr  (code, STK_BASE, cfg->frame_reg);
4541
4542         s390_ahi (code, STK_BASE, cfg->stack_usage);
4543         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4544         s390_br  (code, s390_r14);
4545
4546         /* add code to raise exceptions */
4547         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4548                 switch (patch_info->type) {
4549                 case MONO_PATCH_INFO_EXC: {
4550                         /*-----------------------------------------------------*/
4551                         /* Patch the branch in epilog to come here             */
4552                         /*-----------------------------------------------------*/
4553                         s390_patch (patch_info->ip.i+cfg->native_code+2,
4554                                     S390_RELATIVE(code,patch_info->ip.i+cfg->native_code));
4555                         /*-----------------------------------------------------*/
4556                         /* Patch the parameter passed to the handler           */
4557                         /*-----------------------------------------------------*/
4558                         s390_basr (code, s390_r13, 0);
4559                         s390_j    (code, 4);
4560                         mono_add_patch_info (cfg, code - cfg->native_code,
4561                                              MONO_PATCH_INFO_EXC_NAME,
4562                                              patch_info->data.target);
4563                         s390_word (code, 0);
4564                         /*-----------------------------------------------------*/
4565                         /* Load the return address and the parameter register  */
4566                         /*-----------------------------------------------------*/
4567                         s390_larl (code, s390_r14, S390_RELATIVE((patch_info->ip.i +
4568                                                    cfg->native_code + 8), code));
4569                         s390_l    (code, s390_r2, 0, s390_r13, 4);
4570                         /*-----------------------------------------------------*/
4571                         /* Reuse the current patch to set the jump             */
4572                         /*-----------------------------------------------------*/
4573                         patch_info->type      = MONO_PATCH_INFO_INTERNAL_METHOD;
4574                         patch_info->data.name = "mono_arch_throw_exception_by_name";
4575                         patch_info->ip.i      = code - cfg->native_code;
4576                         s390_jcl  (code, S390_CC_UN, 0);
4577                         break;
4578                 }
4579                 default:
4580                         /* do nothing */
4581                         break;
4582                 }
4583         }
4584
4585         cfg->code_len = code - cfg->native_code;
4586
4587         g_assert (cfg->code_len < cfg->code_size);
4588
4589 }
4590
4591 /*========================= End of Function ========================*/
4592
4593 /*------------------------------------------------------------------*/
4594 /*                                                                  */
4595 /* Name         - mono_arch_setup_jit_tls_data                      */
4596 /*                                                                  */
4597 /* Function     - Setup the JIT's Thread Level Specific Data.       */
4598 /*                                                                  */
4599 /*------------------------------------------------------------------*/
4600
4601 void
4602 mono_arch_setup_jit_tls_data (MonoJitTlsData *tls)
4603 {
4604 }
4605
4606 /*========================= End of Function ========================*/
4607
4608 /*------------------------------------------------------------------*/
4609 /*                                                                  */
4610 /* Name         - mono_arch_free_jit_tls_data                       */
4611 /*                                                                  */
4612 /* Function     - Free tls data.                                    */
4613 /*                                                                  */
4614 /*------------------------------------------------------------------*/
4615
4616 void
4617 mono_arch_free_jit_tls_data (MonoJitTlsData *tls)
4618 {
4619 }
4620
4621 /*========================= End of Function ========================*/
4622
4623 /*------------------------------------------------------------------*/
4624 /*                                                                  */
4625 /* Name         - mono_arch_emit_this_vret_args                     */
4626 /*                                                                  */
4627 /* Function     -                                                   */
4628 /*                                                                  */
4629 /*------------------------------------------------------------------*/
4630
4631 void
4632 mono_arch_emit_this_vret_args (MonoCompile *cfg, MonoCallInst *inst, int this_reg, int this_type, int vt_reg)
4633 {
4634         int this_dreg = s390_r2;
4635
4636         if (vt_reg != -1)
4637                 this_dreg = s390_r3;
4638
4639         /* add the this argument */
4640         if (this_reg != -1) {
4641                 MonoInst *this;
4642                 MONO_INST_NEW (cfg, this, OP_SETREG);
4643                 this->type = this_type;
4644                 this->sreg1 = this_reg;
4645                 this->dreg = this_dreg;
4646                 mono_bblock_add_inst (cfg->cbb, this);
4647         }
4648
4649         if (vt_reg != -1) {
4650                 MonoInst *vtarg;
4651                 MONO_INST_NEW (cfg, vtarg, OP_SETREG);
4652                 vtarg->type = STACK_MP;
4653                 vtarg->sreg1 = vt_reg;
4654                 vtarg->dreg = s390_r2;
4655                 mono_bblock_add_inst (cfg->cbb, vtarg);
4656         }
4657 }
4658
4659 /*========================= End of Function ========================*/
4660
4661 /*------------------------------------------------------------------*/
4662 /*                                                                  */
4663 /* Name         - mono_arch_get_opcode_for_method                   */
4664 /*                                                                  */
4665 /* Function     - Check for opcodes we can handle directly in       */
4666 /*                hardware.                                         */
4667 /*                                                                  */
4668 /*------------------------------------------------------------------*/
4669
4670 gint
4671 mono_arch_get_opcode_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsig, MonoInst **args)
4672 {
4673         if (cmethod->klass == mono_defaults.math_class) {
4674                 if (strcmp (cmethod->name, "Sqrt") == 0)
4675                         return OP_SQRT;
4676         }
4677         return -1;
4678 }
4679
4680 /*========================= End of Function ========================*/
4681
4682 /*------------------------------------------------------------------*/
4683 /*                                                                  */
4684 /* Name         - mono_arch_print_tree                              */
4685 /*                                                                  */
4686 /* Function     - Print platform-specific opcode details.           */
4687 /*                                                                  */
4688 /* Returns      - 1 - opcode details have been printed              */
4689 /*                0 - opcode details have not been printed          */
4690 /*                                                                  */
4691 /*------------------------------------------------------------------*/
4692
4693 gboolean
4694 mono_arch_print_tree (MonoInst *tree, int arity)
4695 {
4696         gboolean done;
4697
4698         switch (tree->opcode) {
4699                 case OP_S390_LOADARG:
4700                 case OP_S390_ARGPTR:
4701                 case OP_S390_STKARG:
4702                         printf ("[0x%x(%s)]", tree->inst_offset,
4703                                 mono_arch_regname (tree->inst_basereg));
4704                         done = 1;
4705                         break;
4706                 default:
4707                         done = 0;
4708         }
4709         return (done);
4710 }
4711
4712 /*========================= End of Function ========================*/
4713
4714 /*------------------------------------------------------------------*/
4715 /*                                                                  */
4716 /* Name         - mono_arch_regalloc_cost                           */
4717 /*                                                                  */
4718 /* Function     - Determine the cost, in the number of memory       */
4719 /*                references, of the action of allocating the var-  */
4720 /*                iable VMV into a register during global register  */
4721 /*                allocation.                                       */
4722 /*                                                                  */
4723 /* Returns      - Cost                                              */
4724 /*                                                                  */
4725 /*------------------------------------------------------------------*/
4726
4727 guint32
4728 mono_arch_regalloc_cost (MonoCompile *cfg, MonoMethodVar *vmv)
4729 {
4730         /* FIXME: */
4731         return 3;
4732 }
4733
4734 /*========================= End of Function ========================*/