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                 curinst = sArg = 1;
1322         } else {
1323                 curinst = sArg = 0;
1324         }
1325
1326         eArg = sig->param_count + sArg;
1327
1328         for (iParm = sArg; iParm < eArg; ++iParm) {
1329                 inst = m->varinfo [curinst];
1330                 if (inst->opcode != OP_REGVAR) {
1331                         if (cinfo->args[iParm].regtype == RegTypeStructByVal) {
1332                                 if (cinfo->args[iParm].vtsize != 0) {
1333                                         inst->opcode       = OP_S390_LOADARG;
1334                                         inst->inst_basereg = frame_reg;
1335                                         size               = sizeof(long);
1336                                         offset             = S390_ALIGN(offset, size);
1337                                         inst->inst_offset  = offset;
1338                                 } else {
1339                                         inst->opcode       = OP_S390_ARGPTR;
1340                                         inst->inst_basereg = frame_reg;
1341                                         size               = cinfo->args[iParm].size;
1342                                         offset             = S390_ALIGN(offset, size);
1343                                         inst->inst_offset  = offset;
1344                                 }
1345                         } else {
1346                                 if (cinfo->args[iParm].reg != STK_BASE) {
1347                                         inst->opcode       = OP_REGOFFSET;
1348                                         inst->inst_basereg = frame_reg;
1349                                         size               = (cinfo->args[iParm].size < 8
1350                                                               ? sizeof(long)
1351                                                               : sizeof(long long));
1352                                         offset             = S390_ALIGN(offset, size);
1353                                         inst->inst_offset  = offset;
1354                                 } else {
1355                                         inst->opcode       = OP_S390_STKARG;
1356                                         inst->inst_basereg = frame_reg;
1357                                         size               = (cinfo->args[iParm].size < 4
1358                                                               ? 4 - cinfo->args[iParm].size
1359                                                               : 0);
1360                                         inst->inst_offset  = cinfo->args[iParm].offset +
1361                                                              size;
1362 //                                      inst->unused       = stackOffset;
1363                                         inst->unused       = 0;
1364                                         size               = sizeof(long);
1365                                 }
1366                         }
1367                         offset += size;
1368                 }
1369                 curinst++;
1370         }
1371
1372         curinst = m->locals_start;
1373         for (iVar = curinst; iVar < m->num_varinfo; ++iVar) {
1374                 inst = m->varinfo [iVar];
1375                 if (inst->opcode == OP_REGVAR)
1376                         continue;
1377
1378                 /* inst->unused indicates native sized value types, this is used by the
1379                 * pinvoke wrappers when they call functions returning structure */
1380                 if (inst->unused && MONO_TYPE_ISSTRUCT (inst->inst_vtype))
1381                         size = mono_class_native_size (inst->inst_vtype->data.klass, &align);
1382                 else
1383                         size = mono_type_size (inst->inst_vtype, &align);
1384
1385                 offset             = S390_ALIGN(offset, align);
1386                 inst->inst_offset  = offset;
1387                 inst->opcode       = OP_REGOFFSET;
1388                 inst->inst_basereg = frame_reg;
1389                 offset            += size;
1390                 //DEBUG (g_print("allocating local %d to %d\n", iVar, inst->inst_offset));
1391         }
1392
1393 //      if (sig->hasthis)
1394 //              curinst = sArg = 1;
1395 //      else
1396 //              curinst = sArg = 0;
1397 //
1398
1399         /*------------------------------------------------------*/
1400         /* Allow space for the trace method stack area if needed*/
1401         /*------------------------------------------------------*/
1402         if (mono_jit_trace_calls != NULL && mono_trace_eval (m))
1403                 offset += S390_TRACE_STACK_SIZE;
1404
1405         /*------------------------------------------------------*/
1406         /* Reserve space to save LMF and caller saved registers */
1407         /*------------------------------------------------------*/
1408         if (m->method->save_lmf)
1409                 offset += sizeof (MonoLMF);
1410
1411         /*------------------------------------------------------*/
1412         /* align the offset                                     */
1413         /*------------------------------------------------------*/
1414         m->stack_offset = S390_ALIGN(offset, S390_STACK_ALIGNMENT);
1415
1416 }
1417
1418 /*========================= End of Function ========================*/
1419
1420 /*------------------------------------------------------------------*/
1421 /*                                                                  */
1422 /* Name         - mono_arch_call_opcode                             */
1423 /*                                                                  */
1424 /* Function     - Take the arguments and generate the arch-specific */
1425 /*                instructions to properly call the function. This  */
1426 /*                includes pushing, moving argments to the correct  */
1427 /*                etc.                                              */
1428 /*                                                                  */
1429 /* Note         - FIXME: We need an alignment solution for          */
1430 /*                enter_method and mono_arch_call_opcode, currently */
1431 /*                alignment in mono_arch_call_opcode is computed    */
1432 /*                without arch_get_argument_info.                   */
1433 /*                                                                  */
1434 /*------------------------------------------------------------------*/
1435
1436 MonoCallInst*
1437 mono_arch_call_opcode (MonoCompile *cfg, MonoBasicBlock* bb, MonoCallInst *call, int is_virtual) {
1438         MonoInst *arg, *in;
1439         MonoMethodSignature *sig;
1440         int i, n, lParamArea;
1441         CallInfo *cinfo;
1442         ArgInfo *ainfo;
1443         size_data sz;
1444
1445         sig = call->signature;
1446         n = sig->param_count + sig->hasthis;
1447         DEBUG (g_print ("Call requires: %d parameters\n",n));
1448
1449         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
1450         if (cinfo->struct_ret)
1451                 call->used_iregs |= 1 << cinfo->struct_ret;
1452
1453         for (i = 0; i < n; ++i) {
1454                 ainfo = cinfo->args + i;
1455                 DEBUG (g_print ("Parameter %d - Register: %d Type: %d\n",
1456                                 i+1,ainfo->reg,ainfo->regtype));
1457                 if (is_virtual && i == 0) {
1458                         /* the argument will be attached to the call instrucion */
1459                         in = call->args [i];
1460                         call->used_iregs |= 1 << ainfo->reg;
1461                 } else {
1462                         MONO_INST_NEW (cfg, arg, OP_OUTARG);
1463                         in = call->args [i];
1464                         arg->cil_code  = in->cil_code;
1465                         arg->inst_left = in;
1466                         arg->type      = in->type;
1467                         /* prepend, we'll need to reverse them later */
1468                         arg->next      = call->out_args;
1469                         call->out_args = arg;
1470                         if (ainfo->regtype == RegTypeGeneral) {
1471                                 arg->unused = ainfo->reg;
1472                                 call->used_iregs |= 1 << ainfo->reg;
1473                                 if (arg->type == STACK_I8)
1474                                         call->used_iregs |= 1 << (ainfo->reg + 1);
1475                         } else if (ainfo->regtype == RegTypeStructByAddr) {
1476                                 arg->unused = ainfo->reg;
1477                                 call->used_iregs |= 1 << ainfo->reg;
1478                         } else if (ainfo->regtype == RegTypeStructByVal) {
1479                                 if (ainfo->reg != STK_BASE) {
1480                                         switch (ainfo->size) {
1481                                         case 0:
1482                                         case 1:
1483                                         case 2:
1484                                         case 4:
1485                                                 call->used_iregs |= 1 << ainfo->reg;
1486                                                 break;
1487                                         case 8:
1488                                                 call->used_iregs |= 1 << ainfo->reg;
1489                                                 call->used_iregs |= 1 << (ainfo->reg+1);
1490                                                 break;
1491                                         }
1492                                 }
1493                                 arg->sreg1    = ainfo->reg;
1494                                 arg->opcode   = OP_OUTARG_VT;
1495                                 if (ainfo->vtsize != 0)
1496                                         arg->unused = -ainfo->vtsize;
1497                                 else
1498                                         arg->unused = ainfo->size;
1499                                 arg->inst_imm     = ainfo->offset;
1500                                 arg->sreg2        = ainfo->offparm;
1501                         } else if (ainfo->regtype == RegTypeBase) {
1502                                 arg->opcode = OP_OUTARG;
1503                                 arg->unused = ainfo->reg | (ainfo->size << 8);
1504                                 arg->inst_imm = ainfo->offset;
1505                         } else if (ainfo->regtype == RegTypeFP) {
1506                                 arg->opcode = OP_OUTARG_R8;
1507                                 arg->unused = ainfo->reg;
1508                                 call->used_fregs |= 1 << ainfo->reg;
1509                                 if (ainfo->size == 4) {
1510                                         /* we reduce the precision */
1511                                         MonoInst *conv;
1512                                         MONO_INST_NEW (cfg, conv, OP_FCONV_TO_R4);
1513                                         conv->inst_left = arg->inst_left;
1514                                         arg->inst_left = conv;
1515                                 }
1516                         } else {
1517                                 g_assert_not_reached ();
1518                         }
1519                 }
1520         }
1521         /*
1522          * Reverse the call->out_args list.
1523          */
1524         {
1525                 MonoInst *prev = NULL, *list = call->out_args, *next;
1526                 while (list) {
1527                         next = list->next;
1528                         list->next = prev;
1529                         prev = list;
1530                         list = next;
1531                 }
1532                 call->out_args = prev;
1533         }
1534         call->stack_usage = cinfo->stack_usage;
1535
1536         lParamArea        = cinfo->stack_usage - S390_MINIMAL_STACK_SIZE;
1537         cfg->param_area   = MAX (cfg->param_area, lParamArea);
1538         cfg->flags       |= MONO_CFG_HAS_CALLS;
1539         /*----------------------------------------------------------*/
1540         /* should set more info in call, such as the stack space    */
1541         /* used by the args that needs to be added back to esp      */
1542         /*----------------------------------------------------------*/
1543
1544         g_free (cinfo);
1545         return call;
1546 }
1547
1548 /*========================= End of Function ========================*/
1549
1550 /*------------------------------------------------------------------*/
1551 /*                                                                  */
1552 /* Name         - mono_arch_instrument_mem_needs                    */
1553 /*                                                                  */
1554 /* Function     - Allow tracing to work with this interface (with   */
1555 /*                an optional argument).                            */
1556 /*                                                                  */
1557 /*------------------------------------------------------------------*/
1558
1559 void
1560 mono_arch_instrument_mem_needs (MonoMethod *method, int *stack, int *code)
1561 {
1562         /* no stack room needed now (may be needed for FASTCALL-trace support) */
1563         *stack = 0;
1564         /* split prolog-epilog requirements? */
1565         *code = 50; /* max bytes needed: check this number */
1566 }
1567
1568 /*========================= End of Function ========================*/
1569
1570 /*------------------------------------------------------------------*/
1571 /*                                                                  */
1572 /* Name         - mono_arch_instrument_prolog                       */
1573 /*                                                                  */
1574 /* Function     - Create an "instrumented" prolog.                  */
1575 /*                                                                  */
1576 /*------------------------------------------------------------------*/
1577
1578 void*
1579 mono_arch_instrument_prolog (MonoCompile *cfg, void *func, void *p,
1580                              gboolean enable_arguments)
1581 {
1582         guchar *code = p;
1583         int     parmOffset,
1584                 fpOffset;
1585
1586         parmOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1587         if (cfg->method->save_lmf)
1588                 parmOffset -= sizeof(MonoLMF);
1589         fpOffset   = parmOffset + (5*sizeof(gint32));
1590
1591         s390_stm  (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1592         s390_std  (code, s390_f0, 0, STK_BASE, fpOffset);
1593         s390_std  (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1594         s390_std  (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1595         s390_basr (code, s390_r13, 0);
1596         s390_j    (code, 6);
1597         s390_word (code, cfg->method);
1598         s390_word (code, func);
1599         s390_l    (code, s390_r2, 0, s390_r13, 4);
1600         s390_la   (code, s390_r3, 0, STK_BASE, parmOffset);
1601         s390_lr   (code, s390_r4, STK_BASE);
1602         s390_ahi  (code, s390_r4, cfg->stack_usage);
1603         s390_l    (code, s390_r1, 0, s390_r13, 8);
1604         s390_basr (code, s390_r14, s390_r1);
1605         s390_ld   (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1606         s390_ld   (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1607         s390_ld   (code, s390_f0, 0, STK_BASE, fpOffset);
1608         s390_lm   (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1609
1610         return code;
1611 }
1612
1613 /*========================= End of Function ========================*/
1614
1615 /*------------------------------------------------------------------*/
1616 /*                                                                  */
1617 /* Name         - mono_arch_instrument_epilog                       */
1618 /*                                                                  */
1619 /* Function     - Create an epilog that will handle the returned    */
1620 /*                values used in instrumentation.                   */
1621 /*                                                                  */
1622 /*------------------------------------------------------------------*/
1623
1624 void*
1625 mono_arch_instrument_epilog (MonoCompile *cfg, void *func, void *p, gboolean enable_arguments)
1626 {
1627         guchar     *code = p;
1628         int        save_mode = SAVE_NONE,
1629                    saveOffset;
1630         MonoMethod *method = cfg->method;
1631         int        rtype = method->signature->ret->type;
1632
1633         saveOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1634         if (method->save_lmf)
1635                 saveOffset -= sizeof(MonoLMF);
1636
1637 handle_enum:
1638         switch (rtype) {
1639         case MONO_TYPE_VOID:
1640                 /* special case string .ctor icall */
1641                 if (strcmp (".ctor", method->name) && method->klass == mono_defaults.string_class)
1642                         save_mode = SAVE_ONE;
1643                 else
1644                         save_mode = SAVE_NONE;
1645                 break;
1646         case MONO_TYPE_I8:
1647         case MONO_TYPE_U8:
1648                 save_mode = SAVE_TWO;
1649                 break;
1650         case MONO_TYPE_R4:
1651         case MONO_TYPE_R8:
1652                 save_mode = SAVE_FP;
1653                 break;
1654         case MONO_TYPE_VALUETYPE:
1655                 if (method->signature->ret->data.klass->enumtype) {
1656                         rtype = method->signature->ret->data.klass->enum_basetype->type;
1657                         goto handle_enum;
1658                 }
1659                 save_mode = SAVE_STRUCT;
1660                 break;
1661         default:
1662                 save_mode = SAVE_ONE;
1663                 break;
1664         }
1665
1666         switch (save_mode) {
1667         case SAVE_TWO:
1668                 s390_stm (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1669                 if (enable_arguments) {
1670                         s390_lr (code, s390_r4, s390_r3);
1671                         s390_lr (code, s390_r3, s390_r2);
1672                 }
1673                 break;
1674         case SAVE_ONE:
1675                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1676                 if (enable_arguments) {
1677                         s390_lr (code, s390_r3, s390_r2);
1678                 }
1679                 break;
1680         case SAVE_FP:
1681                 s390_std (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1682                 if (enable_arguments) {
1683                         /* FIXME: what reg?  */
1684                         s390_ldr (code, s390_f2, s390_f0);
1685                         s390_lm  (code, s390_r3, s390_r4, cfg->frame_reg, saveOffset);
1686                 }
1687                 break;
1688         case SAVE_STRUCT:
1689                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1690                 if (enable_arguments) {
1691                         s390_l (code, s390_r3, 0, cfg->frame_reg,
1692                                 S390_MINIMAL_STACK_SIZE+cfg->param_area);
1693                 }
1694                 break;
1695         case SAVE_NONE:
1696         default:
1697                 break;
1698         }
1699
1700         s390_basr (code, s390_r13, 0);
1701         s390_j    (code, 6);
1702         s390_word (code, cfg->method);
1703         s390_word (code, func);
1704         s390_l    (code, s390_r2, 0, s390_r13, 4);
1705         s390_l    (code, s390_r1, 0, s390_r13, 8);
1706         s390_basr (code, s390_r14, s390_r1);
1707
1708         switch (save_mode) {
1709         case SAVE_TWO:
1710                 s390_lm  (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1711                 break;
1712         case SAVE_ONE:
1713                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1714                 break;
1715         case SAVE_FP:
1716                 s390_ld  (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1717                 break;
1718         case SAVE_STRUCT:
1719                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1720                 break;
1721         case SAVE_NONE:
1722         default:
1723                 break;
1724         }
1725
1726         return code;
1727 }
1728
1729 /*========================= End of Function ========================*/
1730
1731 /*------------------------------------------------------------------*/
1732 /*                                                                  */
1733 /* Name         - peephole_pass                                     */
1734 /*                                                                  */
1735 /* Function     - Form a peephole pass at the code looking for      */
1736 /*                simple optimizations.                             */
1737 /*                                                                  */
1738 /*------------------------------------------------------------------*/
1739
1740 static void
1741 peephole_pass (MonoCompile *cfg, MonoBasicBlock *bb)
1742 {
1743         MonoInst *ins, *last_ins = NULL;
1744         ins = bb->code;
1745
1746         while (ins) {
1747
1748                 switch (ins->opcode) {
1749                 case OP_MUL_IMM:
1750                         /* remove unnecessary multiplication with 1 */
1751                         if (ins->inst_imm == 1) {
1752                                 if (ins->dreg != ins->sreg1) {
1753                                         ins->opcode = OP_MOVE;
1754                                 } else {
1755                                         last_ins->next = ins->next;
1756                                         ins = ins->next;
1757                                         continue;
1758                                 }
1759                         }
1760                         break;
1761                 case OP_LOAD_MEMBASE:
1762                 case OP_LOADI4_MEMBASE:
1763                         /*
1764                          * OP_STORE_MEMBASE_REG reg, offset(basereg)
1765                          * OP_LOAD_MEMBASE offset(basereg), reg
1766                          */
1767                         if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_REG
1768                                          || last_ins->opcode == OP_STORE_MEMBASE_REG) &&
1769                             ins->inst_basereg == last_ins->inst_destbasereg &&
1770                             ins->inst_offset == last_ins->inst_offset) {
1771                                 if (ins->dreg == last_ins->sreg1) {
1772                                         last_ins->next = ins->next;
1773                                         ins = ins->next;
1774                                         continue;
1775                                 } else {
1776                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1777                                         ins->opcode = OP_MOVE;
1778                                         ins->sreg1 = last_ins->sreg1;
1779                                 }
1780
1781                         /*
1782                          * Note: reg1 must be different from the basereg in the second load
1783                          * OP_LOAD_MEMBASE offset(basereg), reg1
1784                          * OP_LOAD_MEMBASE offset(basereg), reg2
1785                          * -->
1786                          * OP_LOAD_MEMBASE offset(basereg), reg1
1787                          * OP_MOVE reg1, reg2
1788                          */
1789                         } if (last_ins && (last_ins->opcode == OP_LOADI4_MEMBASE
1790                                            || last_ins->opcode == OP_LOAD_MEMBASE) &&
1791                               ins->inst_basereg != last_ins->dreg &&
1792                               ins->inst_basereg == last_ins->inst_basereg &&
1793                               ins->inst_offset == last_ins->inst_offset) {
1794
1795                                 if (ins->dreg == last_ins->dreg) {
1796                                         last_ins->next = ins->next;
1797                                         ins = ins->next;
1798                                         continue;
1799                                 } else {
1800                                         ins->opcode = OP_MOVE;
1801                                         ins->sreg1 = last_ins->dreg;
1802                                 }
1803
1804                                 //g_assert_not_reached ();
1805
1806 #if 0
1807                         /*
1808                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1809                          * OP_LOAD_MEMBASE offset(basereg), reg
1810                          * -->
1811                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1812                          * OP_ICONST reg, imm
1813                          */
1814                         } else if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_IMM
1815                                                 || last_ins->opcode == OP_STORE_MEMBASE_IMM) &&
1816                                    ins->inst_basereg == last_ins->inst_destbasereg &&
1817                                    ins->inst_offset == last_ins->inst_offset) {
1818                                 //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1819                                 ins->opcode = OP_ICONST;
1820                                 ins->inst_c0 = last_ins->inst_imm;
1821                                 g_assert_not_reached (); // check this rule
1822 #endif
1823                         }
1824                         break;
1825                 case OP_LOADU1_MEMBASE:
1826                 case OP_LOADI1_MEMBASE:
1827                         if (last_ins && (last_ins->opcode == OP_STOREI1_MEMBASE_REG) &&
1828                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1829                                         ins->inst_offset == last_ins->inst_offset) {
1830                                 if (ins->dreg == last_ins->sreg1) {
1831                                         last_ins->next = ins->next;
1832                                         ins = ins->next;
1833                                         continue;
1834                                 } else {
1835                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1836                                         ins->opcode = OP_MOVE;
1837                                         ins->sreg1 = last_ins->sreg1;
1838                                 }
1839                         }
1840                         break;
1841                 case OP_LOADU2_MEMBASE:
1842                 case OP_LOADI2_MEMBASE:
1843                         if (last_ins && (last_ins->opcode == OP_STOREI2_MEMBASE_REG) &&
1844                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1845                                         ins->inst_offset == last_ins->inst_offset) {
1846                                 if (ins->dreg == last_ins->sreg1) {
1847                                         last_ins->next = ins->next;
1848                                         ins = ins->next;
1849                                         continue;
1850                                 } else {
1851                                         ins->opcode = OP_MOVE;
1852                                         ins->sreg1 = last_ins->sreg1;
1853                                 }
1854                         }
1855                         break;
1856                 case CEE_CONV_I4:
1857                 case CEE_CONV_U4:
1858                 case OP_MOVE:
1859                         /*
1860                          * OP_MOVE reg, reg
1861                          */
1862                         if (ins->dreg == ins->sreg1) {
1863                                 if (last_ins)
1864                                         last_ins->next = ins->next;
1865                                 ins = ins->next;
1866                                 continue;
1867                         }
1868                         /*
1869                          * OP_MOVE sreg, dreg
1870                          * OP_MOVE dreg, sreg
1871                          */
1872                         if (last_ins && last_ins->opcode == OP_MOVE &&
1873                             ins->sreg1 == last_ins->dreg &&
1874                             ins->dreg == last_ins->sreg1) {
1875                                 last_ins->next = ins->next;
1876                                 ins = ins->next;
1877                                 continue;
1878                         }
1879                         break;
1880                 }
1881                 last_ins = ins;
1882                 ins = ins->next;
1883         }
1884         bb->last_ins = last_ins;
1885 }
1886
1887 /*========================= End of Function ========================*/
1888
1889 /*------------------------------------------------------------------*/
1890 /*                                                                  */
1891 /* Name         - mono_spillvar_offset                              */
1892 /*                                                                  */
1893 /* Function     - Returns the offset used by spillvar. It allocates */
1894 /*                a new spill variable if necessary.                */
1895 /*                                                                  */
1896 /*------------------------------------------------------------------*/
1897
1898 static int
1899 mono_spillvar_offset (MonoCompile *cfg, int spillvar)
1900 {
1901         MonoSpillInfo **si, *info;
1902         int i = 0;
1903
1904         si = &cfg->spill_info;
1905
1906         while (i <= spillvar) {
1907
1908                 if (!*si) {
1909                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1910                         info->next = NULL;
1911                         info->offset = cfg->stack_offset;
1912                         cfg->stack_offset += sizeof (gpointer);
1913                 }
1914
1915                 if (i == spillvar)
1916                         return (*si)->offset;
1917
1918                 i++;
1919                 si = &(*si)->next;
1920         }
1921
1922         g_assert_not_reached ();
1923         return 0;
1924 }
1925
1926 /*========================= End of Function ========================*/
1927
1928 /*------------------------------------------------------------------*/
1929 /*                                                                  */
1930 /* Name         - mono_spillvar_offset_float                        */
1931 /*                                                                  */
1932 /* Function     -                                                   */
1933 /*                                                                  */
1934 /*------------------------------------------------------------------*/
1935
1936 static int
1937 mono_spillvar_offset_float (MonoCompile *cfg, int spillvar)
1938 {
1939         MonoSpillInfo **si, *info;
1940         int i = 0;
1941
1942         si = &cfg->spill_info_float;
1943
1944         while (i <= spillvar) {
1945
1946                 if (!*si) {
1947                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1948                         info->next         = NULL;
1949                         cfg->stack_offset  = S390_ALIGN(cfg->stack_offset, S390_STACK_ALIGNMENT);
1950                         info->offset       = cfg->stack_offset;
1951                         cfg->stack_offset += sizeof (double);
1952                 }
1953
1954                 if (i == spillvar)
1955                         return (*si)->offset;
1956
1957                 i++;
1958                 si = &(*si)->next;
1959         }
1960
1961         g_assert_not_reached ();
1962         return 0;
1963 }
1964
1965 /*========================= End of Function ========================*/
1966
1967 /*------------------------------------------------------------------*/
1968 /*                                                                  */
1969 /* Name         - print_ins                                         */
1970 /*                                                                  */
1971 /* Function     - Decode and print the instruction for tracing.     */
1972 /*                                                                  */
1973 /*------------------------------------------------------------------*/
1974
1975 static void
1976 print_ins (int i, MonoInst *ins)
1977 {
1978         const char *spec = ins_spec [ins->opcode];
1979         g_print ("\t%-2d %s", i, mono_inst_name (ins->opcode));
1980         if (spec [MONO_INST_DEST]) {
1981                 if (ins->dreg >= MONO_MAX_IREGS)
1982                         g_print (" R%d <-", ins->dreg);
1983                 else
1984                         g_print (" %s <-", mono_arch_regname (ins->dreg));
1985         }
1986         if (spec [MONO_INST_SRC1]) {
1987                 if (ins->sreg1 >= MONO_MAX_IREGS)
1988                         g_print (" R%d", ins->sreg1);
1989                 else
1990                         g_print (" %s", mono_arch_regname (ins->sreg1));
1991         }
1992         if (spec [MONO_INST_SRC2]) {
1993                 if (ins->sreg2 >= MONO_MAX_IREGS)
1994                         g_print (" R%d", ins->sreg2);
1995                 else
1996                         g_print (" %s", mono_arch_regname (ins->sreg2));
1997         }
1998         if (spec [MONO_INST_CLOB])
1999                 g_print (" clobbers: %c", spec [MONO_INST_CLOB]);
2000         g_print ("\n");
2001 }
2002
2003 /*========================= End of Function ========================*/
2004
2005 /*------------------------------------------------------------------*/
2006 /*                                                                  */
2007 /* Name         - print_regtrack.                                   */
2008 /*                                                                  */
2009 /* Function     -                                                   */
2010 /*                                                                  */
2011 /*------------------------------------------------------------------*/
2012
2013 static void
2014 print_regtrack (RegTrack *t, int num)
2015 {
2016         int i;
2017         char buf [32];
2018         const char *r;
2019
2020         for (i = 0; i < num; ++i) {
2021                 if (!t [i].born_in)
2022                         continue;
2023                 if (i >= MONO_MAX_IREGS) {
2024                         g_snprintf (buf, sizeof(buf), "R%d", i);
2025                         r = buf;
2026                 } else
2027                         r = mono_arch_regname (i);
2028                 g_print ("liveness: %s [%d - %d]\n", r, t [i].born_in, t[i].last_use);
2029         }
2030 }
2031
2032 /*========================= End of Function ========================*/
2033
2034 /*------------------------------------------------------------------*/
2035 /*                                                                  */
2036 /* Name         - inst_list_prepend                                 */
2037 /*                                                                  */
2038 /* Function     - Prepend an instruction to the list.               */
2039 /*                                                                  */
2040 /*------------------------------------------------------------------*/
2041
2042 static inline InstList*
2043 inst_list_prepend (MonoMemPool *pool, InstList *list, MonoInst *data)
2044 {
2045         InstList *item = mono_mempool_alloc (pool, sizeof (InstList));
2046         item->data = data;
2047         item->prev = NULL;
2048         item->next = list;
2049         if (list)
2050                 list->prev = item;
2051         return item;
2052 }
2053
2054 /*========================= End of Function ========================*/
2055
2056 /*------------------------------------------------------------------*/
2057 /*                                                                  */
2058 /* Name         - get_register_force_spilling                       */
2059 /*                                                                  */
2060 /* Function     - Force the spilling of the variable in the         */
2061 /*                symbolic register 'reg'.                          */
2062 /*                                                                  */
2063 /*------------------------------------------------------------------*/
2064
2065 static int
2066 get_register_force_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, int reg)
2067 {
2068         MonoInst *load;
2069         int i, sel, spill;
2070
2071         sel = cfg->rs->iassign [reg];
2072         i = reg;
2073         spill = ++cfg->spill_count;
2074         cfg->rs->iassign [i] = -spill - 1;
2075         mono_regstate_free_int (cfg->rs, sel);
2076         /*----------------------------------------------------------*/
2077         /* we need to create a spill var and insert a load to sel   */
2078         /* after the current instruction                            */
2079         /*----------------------------------------------------------*/
2080         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2081         load->dreg = sel;
2082         load->inst_basereg = cfg->frame_reg;
2083         load->inst_offset = mono_spillvar_offset (cfg, spill);
2084         if (item->prev) {
2085                 while (ins->next != item->prev->data)
2086                         ins = ins->next;
2087         }
2088         load->next = ins->next;
2089         ins->next  = load;
2090         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n",
2091                         spill, load->inst_offset, i, mono_arch_regname (sel)));
2092         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2093         g_assert (i == sel);
2094
2095         return sel;
2096 }
2097
2098 /*========================= End of Function ========================*/
2099
2100 /*------------------------------------------------------------------*/
2101 /*                                                                  */
2102 /* Name         -  get_register_spilling                            */
2103 /*                                                                  */
2104 /* Function     -                                                   */
2105 /*                                                                  */
2106 /*------------------------------------------------------------------*/
2107
2108 static int
2109 get_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2110 {
2111         MonoInst *load;
2112         int i, sel, spill;
2113
2114         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));
2115         /* exclude the registers in the current instruction */
2116         if (reg != ins->sreg1 &&
2117             (reg_is_freeable (ins->sreg1) ||
2118              (ins->sreg1 >= MONO_MAX_IREGS &&
2119               cfg->rs->iassign [ins->sreg1] >= 0))) {
2120                 if (ins->sreg1 >= MONO_MAX_IREGS)
2121                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg1]);
2122                 else
2123                         regmask &= ~ (1 << ins->sreg1);
2124                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2125         }
2126         if (reg != ins->sreg2 &&
2127             (reg_is_freeable (ins->sreg2) ||
2128              (ins->sreg2 >= MONO_MAX_IREGS &&
2129               cfg->rs->iassign [ins->sreg2] >= 0))) {
2130                 if (ins->sreg2 >= MONO_MAX_IREGS)
2131                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg2]);
2132                 else
2133                         regmask &= ~ (1 << ins->sreg2);
2134                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2135         }
2136         if (reg != ins->dreg && reg_is_freeable (ins->dreg)) {
2137                 regmask &= ~ (1 << ins->dreg);
2138                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2139         }
2140
2141         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2142         g_assert (regmask); /* need at least a register we can free */
2143         sel = -1;
2144         /* we should track prev_use and spill the register that's farther */
2145         for (i = 0; i < MONO_MAX_IREGS; ++i) {
2146                 if (regmask & (1 << i)) {
2147                         sel = i;
2148                         DEBUG (g_print ("selected register %s has assignment %d\n", mono_arch_regname (sel), cfg->rs->iassign [sel]));
2149                         break;
2150                 }
2151         }
2152         i = cfg->rs->isymbolic [sel];
2153         spill = ++cfg->spill_count;
2154         cfg->rs->iassign [i] = -spill - 1;
2155         mono_regstate_free_int (cfg->rs, sel);
2156         /* we need to create a spill var and insert a load to sel after the current instruction */
2157         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2158         load->dreg = sel;
2159         load->inst_basereg = cfg->frame_reg;
2160         load->inst_offset = mono_spillvar_offset (cfg, spill);
2161         if (item->prev) {
2162                 while (ins->next != item->prev->data)
2163                         ins = ins->next;
2164         }
2165         load->next = ins->next;
2166         ins->next = load;
2167         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2168         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2169         g_assert (i == sel);
2170
2171         return sel;
2172 }
2173
2174 /*========================= End of Function ========================*/
2175
2176 /*------------------------------------------------------------------*/
2177 /*                                                                  */
2178 /* Name         - get_float_register_spilling                       */
2179 /*                                                                  */
2180 /* Function     -                                                   */
2181 /*                                                                  */
2182 /*------------------------------------------------------------------*/
2183
2184 static int
2185 get_float_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2186 {
2187         MonoInst *load;
2188         int i, sel, spill;
2189
2190         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));
2191         /* exclude the registers in the current instruction */
2192         if (reg != ins->sreg1 &&
2193             (freg_is_freeable (ins->sreg1) ||
2194              (ins->sreg1 >= MONO_MAX_FREGS &&
2195               cfg->rs->fassign [ins->sreg1] >= 0))) {
2196                 if (ins->sreg1 >= MONO_MAX_FREGS)
2197                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg1]);
2198                 else
2199                         regmask &= ~ (1 << ins->sreg1);
2200                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2201         }
2202         if (reg != ins->sreg2 &&
2203             (freg_is_freeable (ins->sreg2) ||
2204              (ins->sreg2 >= MONO_MAX_FREGS &&
2205               cfg->rs->fassign [ins->sreg2] >= 0))) {
2206                 if (ins->sreg2 >= MONO_MAX_FREGS)
2207                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg2]);
2208                 else
2209                         regmask &= ~ (1 << ins->sreg2);
2210                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2211         }
2212         if (reg != ins->dreg && freg_is_freeable (ins->dreg)) {
2213                 regmask &= ~ (1 << ins->dreg);
2214                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2215         }
2216
2217         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2218         g_assert (regmask); /* need at least a register we can free */
2219         sel = -1;
2220         /* we should track prev_use and spill the register that's farther */
2221         for (i = 0; i < MONO_MAX_FREGS; ++i) {
2222                 if (regmask & (1 << i)) {
2223                         sel = i;
2224                         DEBUG (g_print ("selected register %s has assignment %d\n",
2225                                         mono_arch_regname (sel), cfg->rs->fassign [sel]));
2226                         break;
2227                 }
2228         }
2229         i = cfg->rs->fsymbolic [sel];
2230         spill = ++cfg->spill_count;
2231         cfg->rs->fassign [i] = -spill - 1;
2232         mono_regstate_free_float(cfg->rs, sel);
2233         /* we need to create a spill var and insert a load to sel after the current instruction */
2234         MONO_INST_NEW (cfg, load, OP_LOADR8_MEMBASE);
2235         load->dreg = sel;
2236         load->inst_basereg = cfg->frame_reg;
2237         load->inst_offset = mono_spillvar_offset_float (cfg, spill);
2238         if (item->prev) {
2239                 while (ins->next != item->prev->data)
2240                         ins = ins->next;
2241         }
2242         load->next = ins->next;
2243         ins->next = load;
2244         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2245         i = mono_regstate_alloc_float (cfg->rs, 1 << sel);
2246         g_assert (i == sel);
2247
2248         return sel;
2249 }
2250
2251 /*========================= End of Function ========================*/
2252
2253 /*------------------------------------------------------------------*/
2254 /*                                                                  */
2255 /* Name         - create_copy_ins                                   */
2256 /*                                                                  */
2257 /* Function     - Create an instruction to copy from reg to reg.    */
2258 /*                                                                  */
2259 /*------------------------------------------------------------------*/
2260
2261 static MonoInst*
2262 create_copy_ins (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2263 {
2264         MonoInst *copy;
2265         MONO_INST_NEW (cfg, copy, OP_MOVE);
2266         copy->dreg = dest;
2267         copy->sreg1 = src;
2268         if (ins) {
2269                 copy->next = ins->next;
2270                 ins->next = copy;
2271         }
2272         DEBUG (g_print ("\tforced copy from %s to %s\n",
2273                         mono_arch_regname (src), mono_arch_regname (dest)));
2274         return copy;
2275 }
2276
2277 /*========================= End of Function ========================*/
2278
2279 /*------------------------------------------------------------------*/
2280 /*                                                                  */
2281 /* Name         - create_copy_ins_float                             */
2282 /*                                                                  */
2283 /* Function     - Create an instruction to copy from float reg to   */
2284 /*                float reg.                                        */
2285 /*                                                                  */
2286 /*------------------------------------------------------------------*/
2287
2288 static MonoInst*
2289 create_copy_ins_float (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2290 {
2291         MonoInst *copy;
2292         MONO_INST_NEW (cfg, copy, OP_FMOVE);
2293         copy->dreg = dest;
2294         copy->sreg1 = src;
2295         if (ins) {
2296                 copy->next = ins->next;
2297                 ins->next = copy;
2298         }
2299         DEBUG (g_print ("\tforced copy from %s to %s\n",
2300                         mono_arch_regname (src), mono_arch_regname (dest)));
2301         return copy;
2302 }
2303
2304 /*========================= End of Function ========================*/
2305
2306 /*------------------------------------------------------------------*/
2307 /*                                                                  */
2308 /* Name         - create_spilled_store                              */
2309 /*                                                                  */
2310 /* Function     - Spill register to storage.                        */
2311 /*                                                                  */
2312 /*------------------------------------------------------------------*/
2313
2314 static MonoInst*
2315 create_spilled_store (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2316 {
2317         MonoInst *store;
2318         MONO_INST_NEW (cfg, store, OP_STORE_MEMBASE_REG);
2319         store->sreg1 = reg;
2320         store->inst_destbasereg = cfg->frame_reg;
2321         store->inst_offset = mono_spillvar_offset (cfg, spill);
2322         if (ins) {
2323                 store->next = ins->next;
2324                 ins->next = store;
2325         }
2326         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2327                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2328         return store;
2329 }
2330
2331 /*========================= End of Function ========================*/
2332
2333 /*------------------------------------------------------------------*/
2334 /*                                                                  */
2335 /* Name         - create_spilled_store_float                        */
2336 /*                                                                  */
2337 /* Function     - Spill floating point register to storage.         */
2338 /*                                                                  */
2339 /*------------------------------------------------------------------*/
2340
2341 static MonoInst*
2342 create_spilled_store_float (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2343 {
2344         MonoInst *store;
2345         MONO_INST_NEW (cfg, store, OP_STORER8_MEMBASE_REG);
2346         store->sreg1 = reg;
2347         store->inst_destbasereg = cfg->frame_reg;
2348         store->inst_offset = mono_spillvar_offset_float (cfg, spill);
2349         if (ins) {
2350                 store->next = ins->next;
2351                 ins->next = store;
2352         }
2353         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2354                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2355         return store;
2356 }
2357
2358 /*========================= End of Function ========================*/
2359
2360 /*------------------------------------------------------------------*/
2361 /*                                                                  */
2362 /* Name         - insert_before_ins                                 */
2363 /*                                                                  */
2364 /* Function     - Insert an instruction before another.             */
2365 /*                                                                  */
2366 /*------------------------------------------------------------------*/
2367
2368 static void
2369 insert_before_ins (MonoInst *ins, InstList *item, MonoInst* to_insert)
2370 {
2371         MonoInst *prev;
2372         g_assert (item->next);
2373         prev = item->next->data;
2374
2375         while (prev->next != ins)
2376                 prev = prev->next;
2377         to_insert->next = ins;
2378         prev->next = to_insert;
2379         /*
2380          * needed otherwise in the next instruction we can add an ins to the
2381          * end and that would get past this instruction.
2382          */
2383         item->data = to_insert;
2384 }
2385
2386 /*========================= End of Function ========================*/
2387
2388 /*------------------------------------------------------------------*/
2389 /*                                                                  */
2390 /* Name         - alloc_int_reg                                     */
2391 /*                                                                  */
2392 /* Function     - Allocate a general register.                      */
2393 /*                                                                  */
2394 /*------------------------------------------------------------------*/
2395
2396 static int
2397 alloc_int_reg (MonoCompile *cfg, InstList *curinst, MonoInst *ins, int sym_reg, guint32 allow_mask)
2398 {
2399         int val = cfg->rs->iassign [sym_reg];
2400         DEBUG (g_print ("Allocating a general register for %d (%d) with mask %08x\n",val,sym_reg,allow_mask));
2401         if (val < 0) {
2402                 int spill = 0;
2403                 if (val < -1) {
2404                         /* the register gets spilled after this inst */
2405                         spill = -val -1;
2406                 }
2407                 val = mono_regstate_alloc_int (cfg->rs, allow_mask);
2408                 if (val < 0)
2409                         val = get_register_spilling (cfg, curinst, ins, allow_mask, sym_reg);
2410                 cfg->rs->iassign [sym_reg] = val;
2411                 /* add option to store before the instruction for src registers */
2412                 if (spill)
2413                         create_spilled_store (cfg, spill, val, sym_reg, ins);
2414         }
2415         DEBUG (g_print ("Allocated %d for %d\n",val,sym_reg));
2416         cfg->rs->isymbolic [val] = sym_reg;
2417         return val;
2418 }
2419
2420 /*========================= End of Function ========================*/
2421
2422 /*------------------------------------------------------------------*/
2423 /*                                                                  */
2424 /* Name         - mono_arch_local_regalloc.                         */
2425 /*                                                                  */
2426 /* Function     - We first scan the list of instructions and we     */
2427 /*                save the liveness information of each register    */
2428 /*                (when the register is first used, when its value  */
2429 /*                is set etc.). We also reverse the list of instr-  */
2430 /*                uctions (in the InstList list) because assigning  */
2431 /*                registers backwards allows for more tricks to be  */
2432 /*                used.                                             */
2433 /*                                                                  */
2434 /*------------------------------------------------------------------*/
2435
2436 void
2437 mono_arch_local_regalloc (MonoCompile *cfg, MonoBasicBlock *bb)
2438 {
2439         MonoInst *ins;
2440         MonoRegState *rs = cfg->rs;
2441         int i, val;
2442         RegTrack *reginfo, *reginfof;
2443         RegTrack *reginfo1, *reginfo2, *reginfod;
2444         InstList *tmp, *reversed = NULL;
2445         const char *spec;
2446         guint32 src1_mask, src2_mask, dest_mask;
2447         guint32 cur_iregs, cur_fregs;
2448
2449         if (!bb->code)
2450                 return;
2451         rs->next_vireg = bb->max_ireg;
2452         rs->next_vfreg = bb->max_freg;
2453         mono_regstate_assign (rs);
2454         reginfo = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vireg);
2455         reginfof = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vfreg);
2456         rs->ifree_mask = S390_CALLER_REGS;
2457         rs->ffree_mask = S390_CALLER_FREGS;
2458
2459         ins = bb->code;
2460         i = 1;
2461         DEBUG (g_print ("LOCAL regalloc: basic block: %d\n", bb->block_num));
2462         /* forward pass on the instructions to collect register liveness info */
2463         while (ins) {
2464                 spec = ins_spec [ins->opcode];
2465                 DEBUG (print_ins (i, ins));
2466                 if (spec [MONO_INST_CLOB] == 'c') {
2467                         MonoCallInst * call = (MonoCallInst*)ins;
2468                         int j;
2469                 }
2470                 if (spec [MONO_INST_SRC1]) {
2471                         if (spec [MONO_INST_SRC1] == 'f')
2472                                 reginfo1 = reginfof;
2473                         else
2474                                 reginfo1 = reginfo;
2475                         reginfo1 [ins->sreg1].prev_use = reginfo1 [ins->sreg1].last_use;
2476                         reginfo1 [ins->sreg1].last_use = i;
2477                 } else {
2478                         ins->sreg1 = -1;
2479                 }
2480                 if (spec [MONO_INST_SRC2]) {
2481                         if (spec [MONO_INST_SRC2] == 'f')
2482                                 reginfo2 = reginfof;
2483                         else
2484                                 reginfo2 = reginfo;
2485                         reginfo2 [ins->sreg2].prev_use = reginfo2 [ins->sreg2].last_use;
2486                         reginfo2 [ins->sreg2].last_use = i;
2487                 } else {
2488                         ins->sreg2 = -1;
2489                 }
2490                 if (spec [MONO_INST_DEST]) {
2491                         if (spec [MONO_INST_DEST] == 'f')
2492                                 reginfod = reginfof;
2493                         else
2494                                 reginfod = reginfo;
2495                         if (spec [MONO_INST_DEST] != 'b') /* it's not just a base register */
2496                                 reginfod [ins->dreg].killed_in = i;
2497                         reginfod [ins->dreg].prev_use = reginfod [ins->dreg].last_use;
2498                         reginfod [ins->dreg].last_use = i;
2499                         if (reginfod [ins->dreg].born_in == 0 || reginfod [ins->dreg].born_in > i)
2500                                 reginfod [ins->dreg].born_in = i;
2501                         if (spec [MONO_INST_DEST] == 'l') {
2502                                 /* result in eax:edx, the virtual register is allocated sequentially */
2503                                 reginfod [ins->dreg + 1].prev_use = reginfod [ins->dreg + 1].last_use;
2504                                 reginfod [ins->dreg + 1].last_use = i;
2505                                 if (reginfod [ins->dreg + 1].born_in == 0 || reginfod [ins->dreg + 1].born_in > i)
2506                                         reginfod [ins->dreg + 1].born_in = i;
2507                         }
2508                 } else {
2509                         ins->dreg = -1;
2510                 }
2511                 reversed = inst_list_prepend (cfg->mempool, reversed, ins);
2512                 ++i;
2513                 ins = ins->next;
2514         }
2515
2516         cur_iregs = S390_CALLER_REGS;
2517         cur_fregs = S390_CALLER_FREGS;
2518
2519         DEBUG (print_regtrack (reginfo, rs->next_vireg));
2520         DEBUG (print_regtrack (reginfof, rs->next_vfreg));
2521         tmp = reversed;
2522         while (tmp) {
2523                 int prev_dreg, prev_sreg1, prev_sreg2;
2524                 --i;
2525                 ins = tmp->data;
2526                 spec = ins_spec [ins->opcode];
2527                 DEBUG (g_print ("processing:"));
2528                 DEBUG (print_ins (i, ins));
2529                 /* make the register available for allocation: FIXME add fp reg */
2530                 if (ins->opcode == OP_SETREG || ins->opcode == OP_SETREGIMM) {
2531                         cur_iregs |= 1 << ins->dreg;
2532                         DEBUG (g_print ("adding %d to cur_iregs\n", ins->dreg));
2533                 } else if (ins->opcode == OP_SETFREG) {
2534                         cur_fregs |= 1 << ins->dreg;
2535                         DEBUG (g_print ("adding %d to cur_fregs\n", ins->dreg));
2536                 } else if (spec [MONO_INST_CLOB] == 'c') {
2537                         MonoCallInst *cinst = (MonoCallInst*)ins;
2538                         DEBUG (g_print ("excluding regs 0x%x from cur_iregs (0x%x)\n",
2539                                         cinst->used_iregs, cur_iregs));
2540                         DEBUG (g_print ("excluding fpregs 0x%x from cur_fregs (0x%x)\n",
2541                                         cinst->used_fregs, cur_fregs));
2542                         cur_iregs &= ~cinst->used_iregs;
2543                         cur_fregs &= ~cinst->used_fregs;
2544                         DEBUG (g_print ("available cur_iregs: 0x%x\n", cur_iregs));
2545                         DEBUG (g_print ("available cur_fregs: 0x%x\n", cur_fregs));
2546                         /*------------------------------------------------------------*/
2547                         /* registers used by the calling convention are excluded from */
2548                         /* allocation: they will be selectively enabled when they are */
2549                         /* assigned by the special SETREG opcodes.                    */
2550                         /*------------------------------------------------------------*/
2551                 }
2552                 dest_mask = src1_mask = src2_mask = cur_iregs;
2553                 /*------------------------------------------------------*/
2554                 /* update for use with FP regs...                       */
2555                 /*------------------------------------------------------*/
2556                 if (spec [MONO_INST_DEST] == 'f') {
2557                         dest_mask = cur_fregs;
2558                         if (ins->dreg >= MONO_MAX_FREGS) {
2559                                 val = rs->fassign [ins->dreg];
2560                                 prev_dreg = ins->dreg;
2561                                 if (val < 0) {
2562                                         int spill = 0;
2563                                         if (val < -1) {
2564                                                 /* the register gets spilled after this inst */
2565                                                 spill = -val -1;
2566                                         }
2567                                         val = mono_regstate_alloc_float (rs, dest_mask);
2568                                         if (val < 0)
2569                                                 val = get_float_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2570                                         rs->fassign [ins->dreg] = val;
2571                                         if (spill)
2572                                                 create_spilled_store_float (cfg, spill, val, prev_dreg, ins);
2573                                 }
2574                                 DEBUG (g_print ("\tassigned dreg %s to dest R%d\n",
2575                                                 mono_arch_regname (val), ins->dreg));
2576                                 rs->fsymbolic [val] = prev_dreg;
2577                                 ins->dreg = val;
2578                                 if (spec [MONO_INST_CLOB] == 'c' && ins->dreg != s390_f0) {
2579                                         /* this instruction only outputs to s390_f0, need to copy */
2580                                         create_copy_ins_float (cfg, ins->dreg, s390_f0, ins);
2581                                 }
2582                         } else {
2583                                 prev_dreg = -1;
2584                         }
2585                         if (freg_is_freeable (ins->dreg) && prev_dreg >= 0 && (reginfof [prev_dreg].born_in >= i || !(cur_fregs & (1 << ins->dreg)))) {
2586                                 DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2587                                 mono_regstate_free_float (rs, ins->dreg);
2588                         }
2589                 } else if (ins->dreg >= MONO_MAX_IREGS) {
2590                         val = rs->iassign [ins->dreg];
2591                         prev_dreg = ins->dreg;
2592                         if (val < 0) {
2593                                 int spill = 0;
2594                                 if (val < -1) {
2595                                         /* the register gets spilled after this inst */
2596                                         spill = -val -1;
2597                                 }
2598                                 val = mono_regstate_alloc_int (rs, dest_mask);
2599                                 if (val < 0)
2600                                         val = get_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2601                                 rs->iassign [ins->dreg] = val;
2602                                 if (spill)
2603                                         create_spilled_store (cfg, spill, val, prev_dreg, ins);
2604                         }
2605                         DEBUG (g_print ("\tassigned dreg %s to dest R%d (prev: R%d)\n",
2606                                         mono_arch_regname (val), ins->dreg, prev_dreg));
2607                         rs->isymbolic [val] = prev_dreg;
2608                         ins->dreg = val;
2609                         if (spec [MONO_INST_DEST] == 'l') {
2610                                 int hreg = prev_dreg + 1;
2611                                 val = rs->iassign [hreg];
2612                                 if (val < 0) {
2613                                         int spill = 0;
2614                                         if (val < -1) {
2615                                                 /* the register gets spilled after this inst */
2616                                                 spill = -val -1;
2617                                         }
2618                                         val = mono_regstate_alloc_int (rs, dest_mask);
2619                                         if (val < 0)
2620                                                 val = get_register_spilling (cfg, tmp, ins, dest_mask, hreg);
2621                                         rs->iassign [hreg] = val;
2622                                         if (spill)
2623                                                 create_spilled_store (cfg, spill, val, hreg, ins);
2624                                 }
2625                                 DEBUG (g_print ("\tassigned hreg %s to dest R%d\n", mono_arch_regname (val), hreg));
2626                                 rs->isymbolic [val] = hreg;
2627                                 /* FIXME:? ins->dreg = val; */
2628                                 if (ins->dreg == s390_r3) {
2629                                         if (val != s390_r2)
2630                                                 create_copy_ins (cfg, val, s390_r2, ins);
2631                                 } else if (ins->dreg == s390_r2) {
2632                                         if (val == s390_r3) {
2633                                                 /* swap */
2634                                                 create_copy_ins (cfg, s390_r3, s390_r0, ins);
2635                                                 create_copy_ins (cfg, s390_r2, s390_r3, ins);
2636                                                 create_copy_ins (cfg, s390_r0, s390_r2, ins);
2637                                         } else {
2638                                                 /* two forced copies */
2639                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2640                                                 create_copy_ins (cfg, val, s390_r2, ins);
2641                                         }
2642                                 } else {
2643                                         if (val == s390_r2) {
2644                                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2645                                         } else {
2646                                                 /* two forced copies */
2647                                                 create_copy_ins (cfg, val, s390_r2, ins);
2648                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2649                                         }
2650                                 }
2651                                 if (reg_is_freeable (val) && hreg >= 0 && (reginfo [hreg].born_in >= i && !(cur_iregs & (1 << val)))) {
2652                                         DEBUG (g_print ("\tfreeable %s (R%d)\n", mono_arch_regname (val), hreg));
2653                                         mono_regstate_free_int (rs, val);
2654                                 }
2655                         } else if (spec [MONO_INST_DEST] == 'a' && ins->dreg != s390_r2 && spec [MONO_INST_CLOB] != 'd') {
2656                                 /* this instruction only outputs to s390_r2, need to copy */
2657                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2658                         }
2659                 } else {
2660                         prev_dreg = -1;
2661                 }
2662                 if (spec [MONO_INST_DEST] == 'f' &&
2663                     freg_is_freeable (ins->dreg) &&
2664                     prev_dreg >= 0 && (reginfof [prev_dreg].born_in >= i)) {
2665                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2666                         mono_regstate_free_float (rs, ins->dreg);
2667                 } else if (spec [MONO_INST_DEST] != 'f' &&
2668                            reg_is_freeable (ins->dreg) &&
2669                            prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i)) {
2670                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2671                          mono_regstate_free_int (rs, ins->dreg);
2672                 }
2673                 if (spec [MONO_INST_SRC1] == 'f') {
2674                         src1_mask = cur_fregs;
2675                         if (ins->sreg1 >= MONO_MAX_FREGS) {
2676                                 val = rs->fassign [ins->sreg1];
2677                                 prev_sreg1 = ins->sreg1;
2678                                 if (val < 0) {
2679                                         int spill = 0;
2680                                         if (val < -1) {
2681                                                 /* the register gets spilled after this inst */
2682                                                 spill = -val -1;
2683                                         }
2684                                         //g_assert (val == -1); /* source cannot be spilled */
2685                                         val = mono_regstate_alloc_float (rs, src1_mask);
2686                                         if (val < 0)
2687                                                 val = get_float_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2688                                         rs->fassign [ins->sreg1] = val;
2689                                         DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2690                                         if (spill) {
2691                                                 MonoInst *store = create_spilled_store_float (cfg, spill, val, prev_sreg1, NULL);
2692                                                 insert_before_ins (ins, tmp, store);
2693                                         }
2694                                 }
2695                                 rs->fsymbolic [val] = prev_sreg1;
2696                                 ins->sreg1 = val;
2697                         } else {
2698                                 prev_sreg1 = -1;
2699                         }
2700                 } else if (ins->sreg1 >= MONO_MAX_IREGS) {
2701                         val = rs->iassign [ins->sreg1];
2702                         prev_sreg1 = ins->sreg1;
2703                         if (val < 0) {
2704                                 int spill = 0;
2705                                 if (val < -1) {
2706                                         /* the register gets spilled after this inst */
2707                                         spill = -val -1;
2708 printf("val: %d spill: %d ins->sreg1: %d\n",val,spill,ins->sreg1);
2709                                 }
2710                                 val = mono_regstate_alloc_int (rs, src1_mask);
2711                                 if (val < 0)
2712                                         val = get_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2713                                 rs->iassign [ins->sreg1] = val;
2714                                 DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2715                                 if (spill) {
2716                                         MonoInst *store = create_spilled_store (cfg, spill, val, prev_sreg1, NULL);
2717                                         insert_before_ins (ins, tmp, store);
2718                                 }
2719                         }
2720                         rs->isymbolic [val] = prev_sreg1;
2721                         ins->sreg1 = val;
2722                 } else {
2723                         prev_sreg1 = -1;
2724                 }
2725                 /*----------------------------------------------*/
2726                 /* handle clobbering of sreg1                   */
2727                 /*----------------------------------------------*/
2728                 if ((spec [MONO_INST_CLOB] == '1' ||
2729                      spec [MONO_INST_CLOB] == 's') &&
2730                     ins->dreg != ins->sreg1) {
2731                         MonoInst *copy = create_copy_ins (cfg, ins->dreg, ins->sreg1, NULL);
2732                         DEBUG (g_print ("\tneed to copy sreg1 %s to dreg %s\n",
2733                                         mono_arch_regname (ins->sreg1),
2734                                         mono_arch_regname (ins->dreg)));
2735                         if (ins->sreg2 == -1 || spec [MONO_INST_CLOB] == 's') {
2736                                 /* note: the copy is inserted before the current instruction! */
2737                                 insert_before_ins (ins, tmp, copy);
2738                                 /* we set sreg1 to dest as well */
2739                                 prev_sreg1 = ins->sreg1 = ins->dreg;
2740                         } else {
2741                                 /* inserted after the operation */
2742                                 copy->next = ins->next;
2743                                 ins->next  = copy;
2744                         }
2745                 }
2746
2747                 if (spec [MONO_INST_SRC2] == 'f') {
2748                         src2_mask = cur_fregs;
2749                         if (ins->sreg2 >= MONO_MAX_FREGS) {
2750                                 val = rs->fassign [ins->sreg2];
2751                                 prev_sreg2 = ins->sreg2;
2752                                 if (val < 0) {
2753                                         int spill = 0;
2754                                         if (val < -1) {
2755                                                 /* the register gets spilled after this inst */
2756                                                 spill = -val -1;
2757                                         }
2758                                         val = mono_regstate_alloc_float (rs, src2_mask);
2759                                         if (val < 0)
2760                                                 val = get_float_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2761                                         rs->fassign [ins->sreg2] = val;
2762                                         DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2763                                         if (spill)
2764                                                 create_spilled_store_float (cfg, spill, val, prev_sreg2, ins);
2765                                 }
2766                                 rs->fsymbolic [val] = prev_sreg2;
2767                                 ins->sreg2 = val;
2768                         } else {
2769                                 prev_sreg2 = -1;
2770                         }
2771                 } else if (ins->sreg2 >= MONO_MAX_IREGS) {
2772                         val = rs->iassign [ins->sreg2];
2773                         prev_sreg2 = ins->sreg2;
2774                         if (val < 0) {
2775                                 int spill = 0;
2776                                 if (val < -1) {
2777                                         /* the register gets spilled after this inst */
2778                                         spill = -val -1;
2779                                 }
2780                                 val = mono_regstate_alloc_int (rs, src2_mask);
2781                                 if (val < 0)
2782                                         val = get_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2783                                 rs->iassign [ins->sreg2] = val;
2784                                 DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2785                                 if (spill)
2786                                         create_spilled_store (cfg, spill, val, prev_sreg2, ins);
2787                         }
2788                         rs->isymbolic [val] = prev_sreg2;
2789                         ins->sreg2 = val;
2790                 } else {
2791                         prev_sreg2 = -1;
2792                 }
2793
2794                 if (spec [MONO_INST_CLOB] == 'c') {
2795                         int j, s;
2796                         guint32 clob_mask = S390_CALLER_REGS;
2797                         for (j = 0; j < MONO_MAX_IREGS; ++j) {
2798                                 s = 1 << j;
2799                                 if ((clob_mask & s) && !(rs->ifree_mask & s) && j != ins->sreg1) {
2800                                         //g_warning ("register %s busy at call site\n", mono_arch_regname (j));
2801                                 }
2802                         }
2803                 }
2804                 /*if (reg_is_freeable (ins->sreg1) && prev_sreg1 >= 0 && reginfo [prev_sreg1].born_in >= i) {
2805                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg1)));
2806                         mono_regstate_free_int (rs, ins->sreg1);
2807                 }
2808                 if (reg_is_freeable (ins->sreg2) && prev_sreg2 >= 0 && reginfo [prev_sreg2].born_in >= i) {
2809                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg2)));
2810                         mono_regstate_free_int (rs, ins->sreg2);
2811                 }*/
2812
2813                 //DEBUG (print_ins (i, ins));
2814                 tmp = tmp->next;
2815         }
2816 }
2817
2818 /*========================= End of Function ========================*/
2819
2820 /*------------------------------------------------------------------*/
2821 /*                                                                  */
2822 /* Name         - emit_float_to_int                                 */
2823 /*                                                                  */
2824 /* Function     - Create instructions which will convert a floating */
2825 /*                point value to integer.                           */
2826 /*                                                                  */
2827 /*------------------------------------------------------------------*/
2828
2829 static guchar*
2830 emit_float_to_int (MonoCompile *cfg, guchar *code, int dreg, int sreg, int size, gboolean is_signed)
2831 {
2832         /* sreg is a float, dreg is an integer reg. */
2833         if (is_signed) {
2834                 s390_cfdbr (code, dreg, 5, sreg);
2835         } else {
2836                 s390_basr   (code, s390_r13, 0);
2837                 s390_j      (code, 10);
2838                 s390_double (code, 0x41e0000000000000);
2839                 s390_double (code, 0x41f0000000000000);
2840                 s390_ldr    (code, s390_f0, sreg);
2841                 s390_cdb    (code, s390_f0, 0, s390_r13, 0);
2842                 s390_jl     (code, 10);
2843                 s390_sdb    (code, s390_f0, 0, s390_r13, 8);
2844                 s390_cfdbr  (code, dreg, 7, s390_f0);
2845                 s390_j      (code, 5);
2846                 s390_cfdbr  (code, dreg, 5, sreg);
2847         }
2848         return code;
2849 }
2850
2851 /*========================= End of Function ========================*/
2852
2853 /*------------------------------------------------------------------*/
2854 /*                                                                  */
2855 /* Name         - mono_emit_stack_alloc                             */
2856 /*                                                                  */
2857 /* Function     -                                                   */
2858 /*                                                                  */
2859 /*------------------------------------------------------------------*/
2860
2861 static unsigned char*
2862 mono_emit_stack_alloc (guchar *code, MonoInst* tree)
2863 {
2864         return code;
2865 }
2866
2867 /*========================= End of Function ========================*/
2868
2869 /*------------------------------------------------------------------*/
2870 /*                                                                  */
2871 /* Name         - mono_arch_output_basic_block                      */
2872 /*                                                                  */
2873 /* Function     - Perform the "real" work of emitting instructions  */
2874 /*                that will do the work of in the basic block.      */
2875 /*                                                                  */
2876 /*------------------------------------------------------------------*/
2877
2878 void
2879 mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
2880 {
2881         MonoInst *ins;
2882         MonoCallInst *call;
2883         guint offset;
2884         guint8 *code = cfg->native_code + cfg->code_len;
2885         MonoInst *last_ins = NULL;
2886         guint last_offset = 0;
2887         int max_len, cpos;
2888
2889         if (cfg->opt & MONO_OPT_PEEPHOLE)
2890                 peephole_pass (cfg, bb);
2891
2892         /* we don't align basic blocks of loops on s390 */
2893
2894         if (cfg->verbose_level > 2)
2895                 g_print ("Basic block %d starting at offset 0x%x\n", bb->block_num, bb->native_offset);
2896
2897         cpos = bb->max_offset;
2898
2899         if (cfg->prof_options & MONO_PROFILE_COVERAGE) {
2900                 //MonoCoverageInfo *cov = mono_get_coverage_info (cfg->method);
2901                 //g_assert (!mono_compile_aot);
2902                 //cpos += 6;
2903                 //if (bb->cil_code)
2904                 //      cov->data [bb->dfn].iloffset = bb->cil_code - cfg->cil_code;
2905                 /* this is not thread save, but good enough */
2906                 /* fixme: howto handle overflows? */
2907                 //x86_inc_mem (code, &cov->data [bb->dfn].count);
2908         }
2909
2910         ins = bb->code;
2911         while (ins) {
2912                 offset = code - cfg->native_code;
2913
2914                 max_len = ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
2915
2916                 if (offset > (cfg->code_size - max_len - 16)) {
2917                         cfg->code_size *= 2;
2918                         cfg->native_code = g_realloc (cfg->native_code, cfg->code_size);
2919                         code = cfg->native_code + offset;
2920                 }
2921
2922                 switch (ins->opcode) {
2923                 case OP_STOREI1_MEMBASE_IMM:
2924                         s390_lhi (code, s390_r14, ins->inst_imm);
2925                         if (s390_is_uimm12(ins->inst_offset))
2926                                 s390_stc (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2927                         else {
2928                                 s390_basr (code, s390_r13, 0);
2929                                 s390_j    (code, 4);
2930                                 s390_word (code, ins->inst_offset);
2931                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2932                                 s390_stc  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2933                         }
2934                         break;
2935                 case OP_STOREI2_MEMBASE_IMM:
2936                         s390_lhi (code, s390_r14, ins->inst_imm);
2937                         if (s390_is_uimm12(ins->inst_offset)) {
2938                                 s390_sth (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2939                         } else {
2940                                 s390_basr (code, s390_r14, 0);
2941                                 s390_j    (code, 4);
2942                                 s390_word (code, ins->inst_offset);
2943                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2944                                 s390_sth  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2945                         }
2946                         break;
2947                 case OP_STORE_MEMBASE_IMM:
2948                 case OP_STOREI4_MEMBASE_IMM:
2949                         if (s390_is_imm16(ins->inst_imm)) {
2950                                 s390_lhi  (code, s390_r14, ins->inst_imm);
2951                         } else {
2952                                 s390_basr (code, s390_r13, 0);
2953                                 s390_j    (code, 4);
2954                                 s390_word (code, ins->inst_imm);
2955                                 s390_l    (code, s390_r14, 0, s390_r13, 4);
2956                         }
2957                         if (s390_is_uimm12(ins->inst_offset)) {
2958                                 s390_st  (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2959                         } else {
2960                                 s390_basr (code, s390_r13, 0);
2961                                 s390_j    (code, 4);
2962                                 s390_word (code, ins->inst_offset);
2963                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2964                                 s390_st   (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2965                         }
2966                         break;
2967                 case OP_STOREI1_MEMBASE_REG:
2968                         if (s390_is_uimm12(ins->inst_offset)) {
2969                                 s390_stc  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2970                         } else {
2971                                 s390_basr (code, s390_r13, 0);
2972                                 s390_j    (code, 4);
2973                                 s390_word (code, ins->inst_offset);
2974                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2975                                 s390_stc  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2976                         }
2977                         break;
2978                 case OP_STOREI2_MEMBASE_REG:
2979                         if (s390_is_uimm12(ins->inst_offset)) {
2980                                 s390_sth  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2981                         } else {
2982                                 s390_basr (code, s390_r13, 0);
2983                                 s390_j    (code, 4);
2984                                 s390_word (code, ins->inst_offset);
2985                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2986                                 s390_sth  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2987                         }
2988                         break;
2989                 case OP_STORE_MEMBASE_REG:
2990                 case OP_STOREI4_MEMBASE_REG:
2991                         if (s390_is_uimm12(ins->inst_offset)) {
2992                                 s390_st   (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2993                         } else {
2994                                 s390_basr (code, s390_r13, 0);
2995                                 s390_j    (code, 4);
2996                                 s390_word (code, ins->inst_offset);
2997                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2998                                 s390_st   (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2999                         }
3000                         break;
3001                 case CEE_LDIND_I:
3002                 case CEE_LDIND_I4:
3003                 case CEE_LDIND_U4:
3004                         s390_basr (code, s390_r13, 0);
3005                         s390_j    (code, 4);
3006                         s390_word (code, ins->inst_p0);
3007                         s390_l    (code, s390_r13, 0, s390_r13, 4);
3008                         s390_l    (code, ins->dreg, 0, s390_r13, 0);
3009                         break;
3010                 case OP_LOADU4_MEM:
3011                         g_assert_not_reached ();
3012                         break;
3013                 case OP_LOAD_MEMBASE:
3014                 case OP_LOADI4_MEMBASE:
3015                 case OP_LOADU4_MEMBASE:
3016                         if (s390_is_uimm12(ins->inst_offset))
3017                                 s390_l    (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3018                         else {
3019                                 if (s390_is_imm16(ins->inst_offset)) {
3020                                         s390_lhi (code, s390_r13, ins->inst_offset);
3021                                         s390_l   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3022                                 } else {
3023                                         s390_basr (code, s390_r13, 0);
3024                                         s390_j    (code, 4);
3025                                         s390_word (code, ins->inst_offset);
3026                                         s390_l    (code, s390_r13, 0, s390_r13, 4);
3027                                         s390_l    (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3028                                 }
3029                         }
3030                         break;
3031                 case OP_LOADU1_MEMBASE:
3032                         s390_lhi (code, s390_r0, 0);
3033                         if (s390_is_uimm12(ins->inst_offset))
3034                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3035                         else {
3036                                 s390_basr (code, s390_r13, 0);
3037                                 s390_j    (code, 4);
3038                                 s390_word (code, ins->inst_offset);
3039                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3040                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3041                         }
3042                         s390_lr   (code, ins->dreg, s390_r0);
3043                         break;
3044                 case OP_LOADI1_MEMBASE:
3045                         s390_lhi (code, s390_r0, 0);
3046                         if (s390_is_uimm12(ins->inst_offset))
3047                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3048                         else {
3049                                 s390_basr (code, s390_r13, 0);
3050                                 s390_j    (code, 4);
3051                                 s390_word (code, ins->inst_offset);
3052                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3053                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3054                         }
3055                         s390_lhi  (code, s390_r13, 0x80);
3056                         s390_nr   (code, s390_r13, s390_r0);
3057                         s390_jz   (code, 5);
3058                         s390_lhi  (code, s390_r13, 0xff00);
3059                         s390_or   (code, s390_r0, s390_r13);
3060                         s390_lr   (code, ins->dreg, s390_r0);
3061                         break;
3062                 case OP_LOADU2_MEMBASE:
3063                         s390_lhi (code, s390_r0, 0);
3064                         if (s390_is_uimm12(ins->inst_offset))
3065                                 s390_icm  (code, s390_r0, 3, ins->inst_basereg, ins->inst_offset);
3066                         else {
3067                                 s390_basr (code, s390_r13, 0);
3068                                 s390_j    (code, 4);
3069                                 s390_word (code, ins->inst_offset);
3070                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3071                                 s390_ar   (code, s390_r13, ins->inst_basereg);
3072                                 s390_icm  (code, s390_r0, 3, s390_r13, 0);
3073                         }
3074                         s390_lr  (code, ins->dreg, s390_r0);
3075                         break;
3076                 case OP_LOADI2_MEMBASE:
3077                         s390_lhi (code, s390_r0, 0);
3078                         if (s390_is_uimm12(ins->inst_offset))
3079                                 s390_lh   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3080                         else {
3081                                 s390_basr (code, s390_r13, 0);
3082                                 s390_j    (code, 4);
3083                                 s390_word (code, ins->inst_offset);
3084                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3085                                 s390_lh   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3086                         }
3087                         s390_lr  (code, ins->dreg, s390_r0);
3088                         break;
3089                 case CEE_CONV_I1:
3090                         s390_lhi  (code, s390_r0, 0x80);
3091                         if (ins->dreg != ins->sreg1) {
3092                                 s390_lr   (code, ins->dreg, ins->sreg1);
3093                         }
3094                         s390_nr   (code, s390_r0, ins->sreg1);
3095                         s390_jl   (code, 7);
3096                         s390_lhi  (code, s390_r13, -1);
3097                         s390_sll  (code, s390_r13, 0, 8);
3098                         s390_or   (code, ins->dreg, s390_r13);
3099                         break;
3100                 case CEE_CONV_I2:
3101                         s390_lhi  (code, s390_r0, 0x80);
3102                         if (ins->dreg != ins->sreg1) {
3103                                 s390_lr   (code, ins->dreg, ins->sreg1);
3104                         }
3105                         s390_nr   (code, s390_r0, ins->sreg1);
3106                         s390_jl   (code, 7);
3107                         s390_lhi  (code, s390_r13, -1);
3108                         s390_sll  (code, s390_r13, 0, 16);
3109                         s390_or   (code, ins->dreg, s390_r13);
3110                         break;
3111                 case CEE_CONV_U1:
3112                         s390_lhi  (code, s390_r0, 0xff);
3113                         if (ins->dreg != ins->sreg1) {
3114                                 s390_lr   (code, ins->dreg, ins->sreg1);
3115                         }
3116                         s390_nr   (code, ins->dreg, s390_r0);
3117                         break;
3118                 case CEE_CONV_U2:
3119                         s390_lhi  (code, s390_r0, -1);
3120                         s390_sll  (code, s390_r0, 0, 16);
3121                         s390_srl  (code, s390_r0, 0, 16);
3122                         if (ins->dreg != ins->sreg1) {
3123                                 s390_lr   (code, ins->dreg, ins->sreg1);
3124                         }
3125                         s390_nr   (code, ins->dreg, s390_r0);
3126                         break;
3127                 case OP_COMPARE:
3128                         if ((ins->next) &&
3129                             ((ins->next->opcode >= CEE_BNE_UN) &&
3130                              (ins->next->opcode <= CEE_BLT_UN)))
3131                                 s390_clr  (code, ins->sreg1, ins->sreg2);
3132                         else
3133                                 s390_cr   (code, ins->sreg1, ins->sreg2);
3134                         break;
3135                 case OP_COMPARE_IMM:
3136                         if (s390_is_imm16 (ins->inst_imm)) {
3137                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3138                                 if ((ins->next) &&
3139                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3140                                     (ins->next->opcode <= CEE_BLT_UN)))
3141                                         s390_clr  (code, ins->sreg1, s390_r0);
3142                                 else
3143                                         s390_cr   (code, ins->sreg1, s390_r0);
3144                         }
3145                         else {
3146                                 s390_basr (code, s390_r13, 0);
3147                                 s390_j    (code, 4);
3148                                 s390_word (code, ins->inst_imm);
3149                                 if ((ins->next) &&
3150                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3151                                     (ins->next->opcode <= CEE_BLT_UN)))
3152                                         s390_cl   (code, ins->sreg1, 0, s390_r13, 4);
3153                                 else
3154                                         s390_c    (code, ins->sreg1, 0, s390_r13, 4);
3155                         }
3156                         break;
3157                 case OP_X86_TEST_NULL:
3158                         s390_ltr (code, ins->sreg1, ins->sreg1);
3159                         break;
3160                 case CEE_BREAK:
3161                         s390_break (code);
3162                         break;
3163                 case OP_ADDCC:
3164                         if (ins->dreg != ins->sreg1) {
3165                                 s390_lr   (code, ins->dreg, ins->sreg1);
3166                         }
3167                         s390_alr  (code, ins->dreg, ins->sreg2);
3168                         break;
3169                 case CEE_ADD:
3170                         if (ins->dreg != ins->sreg1) {
3171                                 s390_lr   (code, ins->dreg, ins->sreg1);
3172                         }
3173                         s390_ar   (code, ins->dreg, ins->sreg2);
3174                         break;
3175                 case OP_ADC:
3176                         if (ins->dreg != ins->sreg1) {
3177                                 s390_lr   (code, ins->dreg, ins->sreg1);
3178                         }
3179                         s390_alcr (code, ins->dreg, ins->sreg2);
3180                         break;
3181                 case OP_ADD_IMM:
3182                         if ((ins->next) &&
3183                             (ins->next->opcode == OP_ADC_IMM)) {
3184                                 s390_basr (code, s390_r13, 0);
3185                                 s390_j    (code, 4);
3186                                 s390_word (code, ins->inst_imm);
3187                                 if (ins->dreg != ins->sreg1) {
3188                                         s390_lr   (code, ins->dreg, ins->sreg1);
3189                                 }
3190                                 s390_al   (code, ins->dreg, 0, s390_r13, 4);
3191                         } else {
3192                                 if (s390_is_imm16 (ins->inst_imm)) {
3193                                         if (ins->dreg != ins->sreg1) {
3194                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3195                                         }
3196                                         s390_ahi (code, ins->dreg, ins->inst_imm);
3197                                 } else {
3198                                         s390_basr (code, s390_r13, 0);
3199                                         s390_j    (code, 4);
3200                                         s390_word (code, ins->inst_imm);
3201                                         if (ins->dreg != ins->sreg1) {
3202                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3203                                         }
3204                                         s390_a    (code, ins->dreg, 0, s390_r13, 4);
3205                                 }
3206                         }
3207                         break;
3208                 case OP_ADC_IMM:
3209                         if (s390_is_imm16 (ins->inst_imm)) {
3210                                 if (ins->dreg != ins->sreg1) {
3211                                         s390_lr   (code, ins->dreg, ins->sreg1);
3212                                 }
3213                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3214                                 s390_alcr (code, ins->dreg, s390_r0);
3215                         } else {
3216                                 s390_basr (code, s390_r13, 0);
3217                                 s390_j    (code, 4);
3218                                 s390_word (code, ins->inst_imm);
3219                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3220                                 s390_alcr (code, ins->dreg, s390_r13);
3221                         }
3222                         break;
3223                 case OP_SUBCC:
3224                         if (ins->dreg != ins->sreg1) {
3225                                 s390_lr   (code, ins->dreg, ins->sreg1);
3226                         }
3227                         s390_sr (code, ins->dreg, ins->sreg2);
3228                         break;
3229                 case CEE_SUB:
3230                         if (ins->dreg != ins->sreg1) {
3231                                 s390_lr   (code, ins->dreg, ins->sreg1);
3232                         }
3233                         s390_sr   (code, ins->dreg, ins->sreg2);
3234                         break;
3235                 case OP_SBB:
3236                         if (ins->dreg != ins->sreg1) {
3237                                 s390_lr   (code, ins->dreg, ins->sreg1);
3238                         }
3239                         s390_slbr (code, ins->dreg, ins->sreg2);
3240                         break;
3241                 case OP_SUB_IMM:
3242                         if (s390_is_imm16 (-ins->inst_imm)) {
3243                                 if (ins->dreg != ins->sreg1) {
3244                                         s390_lr   (code, ins->dreg, ins->sreg1);
3245                                 }
3246                                 s390_ahi  (code, ins->dreg, -ins->inst_imm);
3247                         } else {
3248                                 s390_basr (code, s390_r13, 0);
3249                                 s390_j    (code, 4);
3250                                 s390_word (code, ins->inst_imm);
3251                                 if (ins->dreg != ins->sreg1) {
3252                                         s390_lr   (code, ins->dreg, ins->sreg1);
3253                                 }
3254                                 s390_s    (code, ins->dreg, 0, s390_r13, 4);
3255                         }
3256                         break;
3257                 case OP_SBB_IMM:
3258                         s390_basr (code, s390_r13, 0);
3259                         s390_j    (code, 4);
3260                         s390_word (code, ins->inst_imm);
3261                         s390_sl   (code, ins->dreg, 0, s390_r13, 4);
3262                         break;
3263                 case CEE_AND:
3264                         if (ins->sreg1 == ins->dreg) {
3265                                 s390_nr   (code, ins->dreg, ins->sreg2);
3266                         }
3267                         else {
3268                                 if (ins->sreg2 == ins->dreg) {
3269                                         s390_nr  (code, ins->dreg, ins->sreg1);
3270                                 }
3271                                 else {
3272                                         s390_lr  (code, ins->dreg, ins->sreg1);
3273                                         s390_nr  (code, ins->dreg, ins->sreg2);
3274                                 }
3275                         }
3276                         break;
3277                 case OP_AND_IMM:
3278                         if (s390_is_imm16 (ins->inst_imm)) {
3279                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3280                                 if (ins->dreg != ins->sreg1) {
3281                                         s390_lr   (code, ins->dreg, ins->sreg1);
3282                                 }
3283                                 s390_nr   (code, ins->dreg, s390_r0);
3284                         } else {
3285                                 s390_basr (code, s390_r13, 0);
3286                                 s390_j    (code, 4);
3287                                 s390_word (code, ins->inst_imm);
3288                                 if (ins->dreg != ins->sreg1) {
3289                                         s390_lr   (code, ins->dreg, ins->sreg1);
3290                                 }
3291                                 s390_n    (code, ins->dreg, 0, s390_r13, 4);
3292                         }
3293                         break;
3294                 case CEE_DIV:
3295                         s390_lr   (code, s390_r0, ins->sreg1);
3296                         s390_srda (code, s390_r0, 0, 32);
3297                         s390_dr   (code, s390_r0, ins->sreg2);
3298                         s390_lr   (code, ins->dreg, s390_r1);
3299                         break;
3300                 case CEE_DIV_UN:
3301                         s390_lr   (code, s390_r0, ins->sreg1);
3302                         s390_srdl (code, s390_r0, 0, 32);
3303                         s390_dlr  (code, s390_r0, ins->sreg2);
3304                         s390_lr   (code, ins->dreg, s390_r1);
3305                         break;
3306                 case OP_DIV_IMM:
3307                         if (s390_is_imm16 (ins->inst_imm)) {
3308                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3309                                 s390_lr   (code, s390_r0, ins->sreg1);
3310                         } else {
3311                                 s390_basr (code, s390_r13, 0);
3312                                 s390_j    (code, 4);
3313                                 s390_word (code, ins->inst_imm);
3314                                 s390_lr   (code, s390_r0, ins->sreg1);
3315                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3316                         }
3317                         s390_srda (code, s390_r0, 0, 32);
3318                         s390_dr   (code, s390_r0, ins->sreg2);
3319                         s390_lr   (code, ins->dreg, s390_r1);
3320                         break;
3321                 case CEE_REM:
3322                         s390_lr   (code, s390_r0, ins->sreg1);
3323                         s390_srda (code, s390_r0, 0, 32);
3324                         s390_dr   (code, s390_r0, ins->sreg2);
3325                         s390_lr   (code, ins->dreg, s390_r0);
3326                         break;
3327                 case CEE_REM_UN:
3328                         s390_lr   (code, s390_r0, ins->sreg1);
3329                         s390_srdl (code, s390_r0, 0, 32);
3330                         s390_dlr  (code, s390_r0, ins->sreg2);
3331                         s390_lr   (code, ins->dreg, s390_r0);
3332                         break;
3333                 case OP_REM_IMM:
3334                         if (s390_is_imm16 (ins->inst_imm)) {
3335                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3336                                 s390_lr   (code, s390_r0, ins->sreg1);
3337                         } else {
3338                                 s390_basr (code, s390_r13, 0);
3339                                 s390_j    (code, 4);
3340                                 s390_word (code, ins->inst_imm);
3341                                 s390_lr   (code, s390_r0, ins->sreg1);
3342                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3343                         }
3344                         s390_srda (code, s390_r0, 0, 32);
3345                         s390_dr   (code, s390_r0, ins->sreg2);
3346                         s390_lr   (code, ins->dreg, s390_r0);
3347                         break;
3348                 case CEE_OR:
3349                         if (ins->sreg1 == ins->dreg) {
3350                                 s390_or   (code, ins->dreg, ins->sreg2);
3351                         }
3352                         else {
3353                                 if (ins->sreg2 == ins->dreg) {
3354                                         s390_or  (code, ins->dreg, ins->sreg1);
3355                                 }
3356                                 else {
3357                                         s390_lr  (code, ins->dreg, ins->sreg1);
3358                                         s390_or  (code, ins->dreg, ins->sreg2);
3359                                 }
3360                         }
3361                         break;
3362                 case OP_OR_IMM:
3363                         if (s390_is_imm16 (ins->inst_imm)) {
3364                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3365                                 if (ins->dreg != ins->sreg1) {
3366                                         s390_lr   (code, ins->dreg, ins->sreg1);
3367                                 }
3368                                 s390_or   (code, ins->dreg, s390_r0);
3369                         } else {
3370                                 s390_bras (code, s390_r13, 4);
3371                                 s390_word (code, ins->inst_imm);
3372                                 if (ins->dreg != ins->sreg1) {
3373                                         s390_lr   (code, ins->dreg, ins->sreg1);
3374                                 }
3375                                 s390_o    (code, ins->dreg, 0, s390_r13, 0);
3376                         }
3377                         break;
3378                 case CEE_XOR:
3379                         if (ins->sreg1 == ins->dreg) {
3380                                 s390_xr   (code, ins->dreg, ins->sreg2);
3381                         }
3382                         else {
3383                                 if (ins->sreg2 == ins->dreg) {
3384                                         s390_xr  (code, ins->dreg, ins->sreg1);
3385                                 }
3386                                 else {
3387                                         s390_lr  (code, ins->dreg, ins->sreg1);
3388                                         s390_xr  (code, ins->dreg, ins->sreg2);
3389                                 }
3390                         }
3391                         break;
3392                 case OP_XOR_IMM:
3393                         if (s390_is_imm16 (ins->inst_imm)) {
3394                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3395                                 if (ins->dreg != ins->sreg1) {
3396                                         s390_lr   (code, ins->dreg, ins->sreg1);
3397                                 }
3398                                 s390_xr   (code, ins->dreg, s390_r0);
3399                         } else {
3400                                 s390_basr (code, s390_r13, 0);
3401                                 s390_j    (code, 4);
3402                                 s390_word (code, ins->inst_imm);
3403                                 if (ins->dreg != ins->sreg1) {
3404                                         s390_lr   (code, ins->dreg, ins->sreg1);
3405                                 }
3406                                 s390_x    (code, ins->dreg, 0, s390_r13, 4);
3407                         }
3408                         break;
3409                 case CEE_SHL:
3410                         if (ins->sreg1 != ins->dreg) {
3411                                 s390_lr   (code, ins->dreg, ins->sreg1);
3412                         }
3413                         s390_sll  (code, ins->dreg, ins->sreg2, 0);
3414                         break;
3415                 case OP_SHL_IMM:
3416                         if (ins->sreg1 != ins->dreg) {
3417                                 s390_lr   (code, ins->dreg, ins->sreg1);
3418                         }
3419                         s390_sll  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3420                         break;
3421                 case CEE_SHR:
3422                         if (ins->sreg1 != ins->dreg) {
3423                                 s390_lr   (code, ins->dreg, ins->sreg1);
3424                         }
3425                         s390_sra  (code, ins->dreg, ins->sreg2, 0);
3426                         break;
3427                 case OP_SHR_IMM:
3428                         if (ins->sreg1 != ins->dreg) {
3429                                 s390_lr   (code, ins->dreg, ins->sreg1);
3430                         }
3431                         s390_sra  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3432                         break;
3433                 case OP_SHR_UN_IMM:
3434                         if (ins->sreg1 != ins->dreg) {
3435                                 s390_lr   (code, ins->dreg, ins->sreg1);
3436                         }
3437                         s390_srl  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3438                         break;
3439                 case CEE_SHR_UN:
3440                         if (ins->sreg1 != ins->dreg) {
3441                                 s390_lr   (code, ins->dreg, ins->sreg1);
3442                         }
3443                         s390_srl  (code, ins->dreg, ins->sreg2, 0);
3444                         break;
3445                 case CEE_NOT:
3446                         if (ins->sreg1 != ins->dreg) {
3447                                 s390_lr   (code, ins->dreg, ins->sreg1);
3448                         }
3449                         s390_lhi (code, s390_r0, -1);
3450                         s390_xr  (code, ins->dreg, s390_r0);
3451                         break;
3452                 case CEE_NEG:
3453                         s390_lcr (code, ins->dreg, ins->sreg1);
3454                         break;
3455                 case CEE_MUL:
3456                         if (ins->sreg1 == ins->dreg) {
3457                                 s390_msr  (code, ins->dreg, ins->sreg2);
3458                         }
3459                         else {
3460                                 if (ins->sreg2 == ins->dreg) {
3461                                         s390_msr (code, ins->dreg, ins->sreg1);
3462                                 }
3463                                 else {
3464                                         s390_lr  (code, ins->dreg, ins->sreg1);
3465                                         s390_msr (code, ins->dreg, ins->sreg2);
3466                                 }
3467                         }
3468                         break;
3469                 case OP_MUL_IMM:
3470                         if (s390_is_imm16 (ins->inst_imm)) {
3471                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3472                         } else {
3473                                 s390_basr (code, s390_r13, 0);
3474                                 s390_j    (code, 4);
3475                                 s390_word (code, ins->inst_imm);
3476                                 if (ins->dreg != ins->sreg1) {
3477                                         s390_lr   (code, ins->dreg, ins->sreg1);
3478                                 }
3479                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3480                         }
3481                         s390_msr  (code, ins->dreg, s390_r13);
3482                         break;
3483                 case CEE_MUL_OVF:
3484                         s390_lhi  (code, s390_r0, 0);
3485                         s390_lr   (code, s390_r1, ins->sreg1);
3486                         s390_mr   (code, s390_r0, ins->sreg2);
3487                         s390_ltr  (code, s390_r0, s390_r0);
3488                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3489                         s390_lr   (code, ins->dreg, s390_r1);
3490                         break;
3491                 case CEE_MUL_OVF_UN:
3492                         s390_lhi  (code, s390_r0, 0);
3493                         s390_lr   (code, s390_r1, ins->sreg1);
3494                         s390_mlr  (code, s390_r0, ins->sreg2);
3495                         s390_ltr  (code, s390_r0, s390_r0);
3496                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3497                         s390_lr   (code, ins->dreg, s390_r1);
3498                         break;
3499                 case OP_LMUL:
3500                         s390_l    (code, s390_r0, 0, ins->sreg1, 4);
3501                         s390_lr   (code, s390_r14, s390_r0);
3502                         s390_srda (code, s390_r0, 0, 32);
3503                         s390_m    (code, s390_r0, 0, ins->sreg2, 4);
3504                         s390_srl  (code, s390_r14, 0, 31);
3505                         s390_a    (code, s390_r14, 0, ins->sreg1, 0);
3506                         s390_l    (code, s390_r13, 0, ins->sreg2, 0);
3507                         s390_srl  (code, s390_r13, 0, 31);
3508                         s390_ms   (code, s390_r13, 0, ins->sreg1, 4);
3509                         s390_ar   (code, s390_r14, s390_r13);
3510                         s390_st   (code, s390_r14, 0, ins->dreg, 0);
3511                         s390_st   (code, s390_r1, 0, ins->dreg, 4);
3512                         break;
3513                 case OP_ICONST:
3514                 case OP_SETREGIMM:
3515                         if (s390_is_imm16(ins->inst_c0)) {
3516                                 s390_lhi  (code, ins->dreg, ins->inst_c0);
3517                         } else {
3518                                 s390_basr (code, s390_r13, 0);
3519                                 s390_j    (code, 4);
3520                                 s390_word (code, ins->inst_c0);
3521                                 s390_l    (code, ins->dreg, 0, s390_r13, 4);
3522                         }
3523                         break;
3524                 case OP_AOTCONST:
3525                         s390_basr (code, s390_r13, 0);
3526                         s390_j    (code, 4);
3527                         mono_add_patch_info (cfg, code - cfg->native_code,
3528                                 (MonoJumpInfoType)ins->inst_i1, ins->inst_p0);
3529                         s390_word (code, 0);
3530                         s390_l    (code,ins->dreg, 0, s390_r13, 4);
3531                         break;
3532                 case CEE_CONV_I4:
3533                 case CEE_CONV_U4:
3534                 case OP_MOVE:
3535                 case OP_SETREG:
3536                         if (ins->dreg != ins->sreg1) {
3537                                 s390_lr (code, ins->dreg, ins->sreg1);
3538                         }
3539                         break;
3540                 case OP_SETLRET: {
3541                         int saved = ins->sreg1;
3542                         if (ins->sreg1 == s390_r2) {
3543                                 s390_lr (code, s390_r0, ins->sreg1);
3544                                 saved = s390_r0;
3545                         }
3546                         if (ins->sreg2 != s390_r2)
3547                                 s390_lr (code, s390_r2, ins->sreg2);
3548                         if (saved != s390_r3)
3549                                 s390_lr (code, s390_r3, saved);
3550                         break;
3551                 }
3552                 case OP_SETFREG:
3553                 case OP_FMOVE:
3554                         if (ins->dreg != ins->sreg1) {
3555                                 s390_ldr   (code, ins->dreg, ins->sreg1);
3556                         }
3557                         break;
3558                 case OP_FCONV_TO_R4:
3559                         s390_ledbr (code, ins->dreg, ins->sreg1);
3560                         break;
3561                 case CEE_JMP:
3562                         g_assert_not_reached ();
3563                         break;
3564                 case OP_CHECK_THIS:
3565                         /* ensure ins->sreg1 is not NULL */
3566                         s390_icm (code, s390_r0, 15, ins->sreg1, 0);
3567                         break;
3568                 case OP_FCALL:
3569                 case OP_LCALL:
3570                 case OP_VCALL:
3571                 case OP_VOIDCALL:
3572                 case CEE_CALL:
3573                         call = (MonoCallInst*)ins;
3574                         if (ins->flags & MONO_INST_HAS_METHOD)
3575                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_METHOD, call->method);
3576                         else
3577                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_ABS, call->fptr);
3578                         s390_brasl (code, s390_r14, 0);
3579                         break;
3580                 case OP_FCALL_REG:
3581                 case OP_LCALL_REG:
3582                 case OP_VCALL_REG:
3583                 case OP_VOIDCALL_REG:
3584                 case OP_CALL_REG:
3585                         s390_lr   (code, s390_r1, ins->sreg1);
3586                         s390_basr (code, s390_r14, s390_r1);
3587                         break;
3588                 case OP_FCALL_MEMBASE:
3589                 case OP_LCALL_MEMBASE:
3590                 case OP_VCALL_MEMBASE:
3591                 case OP_VOIDCALL_MEMBASE:
3592                 case OP_CALL_MEMBASE:
3593                         s390_l    (code, s390_r1, 0, ins->sreg1, ins->inst_offset);
3594                         s390_basr (code, s390_r14, s390_r1);
3595                         break;
3596                 case OP_OUTARG:
3597                         g_assert_not_reached ();
3598                         break;
3599                 case OP_LOCALLOC:
3600                         s390_lr   (code, s390_r1, ins->sreg1);
3601                         s390_ahi  (code, s390_r1, 14);
3602                         s390_srl  (code, s390_r1, 0, 3);
3603                         s390_sll  (code, s390_r1, 0, 3);
3604                         s390_l    (code, s390_r13, 0, STK_BASE, 0);
3605                         s390_lcr  (code, s390_r1, s390_r1);
3606                         s390_la   (code, STK_BASE, STK_BASE, s390_r1, 0);
3607                         s390_st   (code, s390_r13, 0, STK_BASE, 0);
3608                         s390_la   (code, ins->dreg, 0, STK_BASE, S390_MINIMAL_STACK_SIZE+7);
3609                         s390_srl  (code, ins->dreg, 0, 3);
3610                         s390_sll  (code, ins->dreg, 0, 3);
3611                         break;
3612                 case CEE_RET:
3613                         s390_br  (code, s390_r14);
3614                         break;
3615                 case CEE_THROW: {
3616                         s390_lr (code, s390_r2, ins->sreg1);
3617                         mono_add_patch_info (cfg, code-cfg->native_code, MONO_PATCH_INFO_INTERNAL_METHOD,
3618                                              (gpointer)"mono_arch_throw_exception");
3619                         s390_brasl (code, s390_r14, 0);
3620                         break;
3621                 }
3622                 case OP_START_HANDLER:
3623                         s390_lr   (code, s390_r0, s390_r14);
3624                         s390_st   (code, s390_r0, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3625                         break;
3626                 case OP_ENDFILTER:
3627                         if (ins->sreg1 != s390_r2)
3628                                 s390_lr (code, s390_r2, ins->sreg1);
3629                         s390_l   (code, STK_BASE, 0, STK_BASE, 0);
3630                         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
3631                         s390_br  (code, s390_r14);
3632                         break;
3633                 case CEE_ENDFINALLY:
3634                         s390_l   (code, s390_r14, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3635                         s390_br  (code, s390_r14);
3636                         break;
3637                 case OP_CALL_HANDLER:
3638                         mono_add_patch_info (cfg, code-cfg->native_code,
3639                                              MONO_PATCH_INFO_BB, ins->inst_target_bb);
3640                         s390_brasl (code, s390_r14, 0);
3641                         break;
3642                 case OP_LABEL:
3643                         ins->inst_c0 = code - cfg->native_code;
3644                         break;
3645                 case CEE_BR:
3646                         EMIT_UNCOND_BRANCH(ins);
3647                         break;
3648                 case OP_BR_REG:
3649                         s390_br  (code, ins->sreg1);
3650                         break;
3651                 case OP_CEQ:
3652                         s390_lhi (code, ins->dreg, 1);
3653                         s390_jz  (code, 4);
3654                         s390_lhi (code, ins->dreg, 0);
3655                         break;
3656                 case OP_CLT:
3657                         s390_lhi (code, ins->dreg, 1);
3658                         s390_jl  (code, 4);
3659                         s390_lhi (code, ins->dreg, 0);
3660                         break;
3661                 case OP_CLT_UN:
3662                         s390_lhi (code, ins->dreg, 1);
3663                         s390_jlo (code, 4);
3664                         s390_lhi (code, ins->dreg, 0);
3665                         break;
3666                 case OP_CGT:
3667                         s390_lhi (code, ins->dreg, 1);
3668                         s390_jh  (code, 4);
3669                         s390_lhi (code, ins->dreg, 0);
3670                         break;
3671                 case OP_CGT_UN:
3672                         s390_lhi (code, ins->dreg, 1);
3673                         s390_jho (code, 4);
3674                         s390_lhi (code, ins->dreg, 0);
3675                         break;
3676                 case OP_COND_EXC_EQ:
3677                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_EQ, ins->inst_p1);
3678                         break;
3679                 case OP_COND_EXC_NE_UN:
3680                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NE, ins->inst_p1);
3681                         break;
3682                 case OP_COND_EXC_LT:
3683                 case OP_COND_EXC_LT_UN:
3684                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LT, ins->inst_p1);
3685                         break;
3686                 case OP_COND_EXC_GT:
3687                 case OP_COND_EXC_GT_UN:
3688                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GT, ins->inst_p1);
3689                         break;
3690                 case OP_COND_EXC_GE:
3691                 case OP_COND_EXC_GE_UN:
3692                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GE, ins->inst_p1);
3693                         break;
3694                 case OP_COND_EXC_LE:
3695                 case OP_COND_EXC_LE_UN:
3696                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LE, ins->inst_p1);
3697                         break;
3698                 case OP_COND_EXC_OV:
3699                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_OV, ins->inst_p1);
3700                         break;
3701                 case OP_COND_EXC_NO:
3702                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NO, ins->inst_p1);
3703                         break;
3704                 case OP_COND_EXC_C:
3705                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_CY, ins->inst_p1);
3706                         break;
3707                 case OP_COND_EXC_NC:
3708                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NC, ins->inst_p1);
3709                         break;
3710                 case CEE_BEQ:
3711                         EMIT_COND_BRANCH (ins, S390_CC_EQ);
3712                         break;
3713                 case CEE_BNE_UN:
3714                         EMIT_COND_BRANCH (ins, S390_CC_NE);
3715                         break;
3716                 case CEE_BLT:
3717                 case CEE_BLT_UN:
3718                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3719                         break;
3720                 case CEE_BGT:
3721                 case CEE_BGT_UN:
3722                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3723                         break;
3724                 case CEE_BGE:
3725                 case CEE_BGE_UN:
3726                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3727                         break;
3728                 case CEE_BLE:
3729                 case CEE_BLE_UN:
3730                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3731                         break;
3732
3733                 /* floating point opcodes */
3734                 case OP_R8CONST:
3735                         if (*((float *) ins->inst_p0) == 0) {
3736                                 s390_lzdr (code, ins->dreg);
3737                         } else {
3738                                 s390_basr  (code, s390_r13, 0);
3739                                 s390_j     (code, 4);
3740                                 s390_word  (code, ins->inst_p0);
3741                                 s390_l     (code, s390_r13, 0, s390_r13, 4);
3742                                 s390_ld    (code, ins->dreg, 0, s390_r13, 0);
3743                         }
3744                         break;
3745                 case OP_R4CONST:
3746                         if (*((float *) ins->inst_p0) == 0) {
3747                                 s390_lzer (code, ins->dreg);
3748                         } else {
3749                                 s390_basr (code, s390_r13, 0);
3750                                 s390_j    (code, 4);
3751                                 s390_word (code, ins->inst_p0);
3752                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3753                                 s390_le   (code, ins->dreg, 0, s390_r13, 0);
3754                                 s390_ldebr(code, ins->dreg, ins->dreg);
3755                         }
3756                         break;
3757                 case OP_STORER8_MEMBASE_REG:
3758                         if (s390_is_uimm12(ins->inst_offset)) {
3759                                 s390_std  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3760                         } else {
3761                                 s390_basr (code, s390_r13, 0);
3762                                 s390_j    (code, 4);
3763                                 s390_word (code, ins->inst_offset);
3764                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3765                                 s390_std  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3766                         }
3767                         break;
3768                 case OP_LOADR8_MEMBASE:
3769                         if (s390_is_uimm12(ins->inst_offset)) {
3770                                 s390_ld   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3771                         } else {
3772                                 s390_basr (code, s390_r13, 0);
3773                                 s390_j    (code, 4);
3774                                 s390_word (code, ins->inst_offset);
3775                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3776                                 s390_ld   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3777                         }
3778                         break;
3779                 case OP_STORER4_MEMBASE_REG:
3780                         if (s390_is_uimm12(ins->inst_offset)) {
3781                                 s390_ledbr(code, s390_f0, ins->sreg1);
3782                                 s390_ste  (code, s390_f0, 0, ins->inst_destbasereg, ins->inst_offset);
3783                         } else {
3784                                 s390_basr (code, s390_r13, 0);
3785                                 s390_j    (code, 4);
3786                                 s390_word (code, ins->inst_offset);
3787                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3788                                 s390_ledbr(code, s390_f0, ins->sreg1);
3789                                 s390_ste  (code, s390_f0, s390_r13, ins->inst_destbasereg, 0);
3790                         }
3791                         break;
3792                 case OP_LOADR4_MEMBASE:
3793                         if (s390_is_uimm12(ins->inst_offset)) {
3794                                 s390_le   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3795                         } else {
3796                                 s390_basr (code, s390_r13, 0);
3797                                 s390_j    (code, 4);
3798                                 s390_word (code, ins->inst_offset);
3799                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3800                                 s390_le   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3801                         }
3802                         s390_ldebr (code, ins->dreg, ins->dreg);
3803                         break;
3804                 case CEE_CONV_R_UN:
3805                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3806                         s390_ltr   (code, ins->sreg1, ins->sreg1);
3807                         s390_jnl   (code, 12);
3808                         s390_basr  (code, s390_r13, 0);
3809                         s390_j     (code, 6);
3810                         s390_word  (code, 0x41f00000);
3811                         s390_word  (code, 0);
3812                         s390_adb   (code, ins->dreg, 0, s390_r13, 4);
3813                         break;
3814                 case CEE_CONV_R4:
3815                         s390_cefbr (code, ins->dreg, ins->sreg1);
3816                         break;
3817                 case CEE_CONV_R8:
3818                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3819                         break;
3820                 case OP_FCONV_TO_I1:
3821                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, TRUE);
3822                         break;
3823                 case OP_FCONV_TO_U1:
3824                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, FALSE);
3825                         break;
3826                 case OP_FCONV_TO_I2:
3827                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, TRUE);
3828                         break;
3829                 case OP_FCONV_TO_U2:
3830                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, FALSE);
3831                         break;
3832                 case OP_FCONV_TO_I4:
3833                 case OP_FCONV_TO_I:
3834                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, TRUE);
3835                         break;
3836                 case OP_FCONV_TO_U4:
3837                 case OP_FCONV_TO_U:
3838                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, FALSE);
3839                         break;
3840                 case OP_FCONV_TO_I8:
3841                 case OP_FCONV_TO_U8:
3842                         g_assert_not_reached ();
3843                         /* Implemented as helper calls */
3844                         break;
3845                 case OP_LCONV_TO_R_UN:
3846                         g_assert_not_reached ();
3847                         /* Implemented as helper calls */
3848                         break;
3849                 case OP_LCONV_TO_OVF_I: {
3850                         /* Valid ints: 0xffffffff:8000000 to 00000000:0x7f000000 */
3851                         short int *o[5];
3852                         s390_ltr  (code, ins->sreg2, ins->sreg2);
3853                         s390_jnl  (code, 0); CODEPTR(code, o[0]);
3854                         s390_ltr  (code, ins->sreg1, ins->sreg1);
3855                         s390_jnl  (code, 0); CODEPTR(code, o[1]);
3856                         s390_lhi  (code, s390_r13, -1);
3857                         s390_cr   (code, ins->sreg1, s390_r13);
3858                         s390_jnz  (code, 0); CODEPTR(code, o[2]);
3859                         if (ins->dreg != ins->sreg2)
3860                                 s390_lr   (code, ins->dreg, ins->sreg2);
3861                         s390_j    (code, 0); CODEPTR(code, o[3]);
3862                         PTRSLOT(code, o[0]);
3863                         s390_jz   (code, 0); CODEPTR(code, o[4]);
3864                         PTRSLOT(code, o[1]);
3865                         PTRSLOT(code, o[2]);
3866                         mono_add_patch_info (cfg, code - cfg->native_code,
3867                                              MONO_PATCH_INFO_EXC, "OverflowException");
3868                         s390_brasl (code, s390_r14, 0);
3869                         PTRSLOT(code, o[3]);
3870                         PTRSLOT(code, o[4]);
3871                         break;
3872                 }
3873                 case OP_SQRT:
3874                         s390_sqdbr (code, ins->dreg, ins->sreg1);
3875                         break;
3876                 case OP_FADD:
3877                         if (ins->dreg == ins->sreg1)
3878                                 s390_adbr (code, ins->dreg, ins->sreg2);
3879                         else {
3880                                 if (ins->dreg == ins->sreg2)
3881                                         s390_adbr (code, ins->dreg, ins->sreg1);
3882                                 else {
3883                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3884                                         s390_adbr (code, ins->dreg, ins->sreg2);
3885                                 }
3886                         }
3887                         break;
3888                 case OP_FSUB:
3889                         if (ins->dreg == ins->sreg1)
3890                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3891                         else {
3892                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3893                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3894                         }
3895                         break;
3896                 case OP_FMUL:
3897                         if (ins->dreg == ins->sreg1)
3898                                 s390_mdbr (code, ins->dreg, ins->sreg2);
3899                         else {
3900                                 if (ins->dreg == ins->sreg2)
3901                                         s390_mdbr (code, ins->dreg, ins->sreg1);
3902                                 else {
3903                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3904                                         s390_mdbr (code, ins->dreg, ins->sreg2);
3905                                 }
3906                         }
3907                         break;
3908                 case OP_FDIV:
3909                         if (ins->dreg == ins->sreg1)
3910                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3911                         else {
3912                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3913                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3914                         }
3915                         break;
3916                 case OP_FNEG:
3917                         s390_lcdbr (code, ins->dreg, ins->sreg1);
3918                         break;
3919                 case OP_FREM:
3920                         if (ins->dreg != ins->sreg1) {
3921                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3922                         }
3923                         s390_didbr (code, ins->dreg, ins->sreg2, 5, s390_f15);
3924                         break;
3925                 case OP_FCOMPARE:
3926                         s390_cdbr (code, ins->sreg1, ins->sreg2);
3927                         break;
3928                 case OP_FCEQ:
3929                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3930                         s390_lhi   (code, ins->dreg, 1);
3931                         s390_je    (code, 4);
3932                         s390_lhi   (code, ins->dreg, 0);
3933                         break;
3934                 case OP_FCLT:
3935                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3936                         s390_lhi   (code, ins->dreg, 1);
3937                         s390_jl    (code, 4);
3938                         s390_lhi   (code, ins->dreg, 0);
3939                         break;
3940                 case OP_FCLT_UN:
3941                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3942                         s390_lhi   (code, ins->dreg, 1);
3943                         s390_jlo   (code, 4);
3944                         s390_lhi   (code, ins->dreg, 0);
3945                         break;
3946                 case OP_FCGT:
3947                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3948                         s390_lhi   (code, ins->dreg, 1);
3949                         s390_jh    (code, 4);
3950                         s390_lhi   (code, ins->dreg, 0);
3951                         break;
3952                 case OP_FCGT_UN:
3953                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3954                         s390_lhi   (code, ins->dreg, 1);
3955                         s390_jho   (code, 4);
3956                         s390_lhi   (code, ins->dreg, 0);
3957                         break;
3958                 case OP_FBEQ:
3959                         EMIT_COND_BRANCH (ins, S390_CC_EQ|S390_CC_OV);
3960                         break;
3961                 case OP_FBNE_UN:
3962                         EMIT_COND_BRANCH (ins, S390_CC_NE|S390_CC_OV);
3963                         break;
3964                 case OP_FBLT:
3965                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3966                         break;
3967                 case OP_FBLT_UN:
3968                         EMIT_COND_BRANCH (ins, S390_CC_LT|S390_CC_OV);
3969                         break;
3970                 case OP_FBGT:
3971                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3972                         break;
3973                 case OP_FBGT_UN:
3974                         EMIT_COND_BRANCH (ins, S390_CC_GT|S390_CC_OV);
3975                         break;
3976                 case OP_FBGE:
3977                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3978                         break;
3979                 case OP_FBGE_UN:
3980                         EMIT_COND_BRANCH (ins, S390_CC_GE|S390_CC_OV);
3981                         break;
3982                 case OP_FBLE:
3983                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3984                         break;
3985                 case OP_FBLE_UN:
3986                         EMIT_COND_BRANCH (ins, S390_CC_LE|S390_CC_OV);
3987                         break;
3988                 case CEE_CKFINITE: {
3989                         short *o;
3990                         s390_lhi  (code, s390_r13, 0xfc0);
3991                         s390_tcdb (code, ins->sreg1, 0, s390_r13, 0);
3992                         s390_jz   (code, 0); CODEPTR(code, o);
3993                         mono_add_patch_info (cfg, code - cfg->native_code + 2,
3994                                              MONO_PATCH_INFO_EXC, "ArithmeticException");
3995                         s390_brasl (code, s390_r14,0);
3996                         PTRSLOT(code, o);
3997                         break;
3998                 }
3999                 default:
4000                         g_warning ("unknown opcode %s in %s()\n", mono_inst_name (ins->opcode), __FUNCTION__);
4001                         g_assert_not_reached ();
4002                 }
4003
4004                 if ((cfg->opt & MONO_OPT_BRANCH) && ((code - cfg->native_code - offset) > max_len)) {
4005                         g_warning ("wrong maximal instruction length of instruction %s (expected %d, got %d)",
4006                                    mono_inst_name (ins->opcode), max_len, code - cfg->native_code - offset);
4007                         g_assert_not_reached ();
4008                 }
4009
4010                 cpos += max_len;
4011
4012                 last_ins = ins;
4013                 last_offset = offset;
4014
4015                 ins = ins->next;
4016         }
4017
4018         cfg->code_len = code - cfg->native_code;
4019 }
4020
4021 /*========================= End of Function ========================*/
4022
4023 /*------------------------------------------------------------------*/
4024 /*                                                                  */
4025 /* Name         - mono_arch_register_lowlevel_calls                 */
4026 /*                                                                  */
4027 /* Function     - Register routines to help with --trace operation. */
4028 /*                                                                  */
4029 /*------------------------------------------------------------------*/
4030
4031 void
4032 mono_arch_register_lowlevel_calls (void)
4033 {
4034         mono_register_jit_icall (enter_method, "mono_enter_method", NULL, TRUE);
4035         mono_register_jit_icall (leave_method, "mono_leave_method", NULL, TRUE);
4036 }
4037
4038 /*========================= End of Function ========================*/
4039
4040 /*------------------------------------------------------------------*/
4041 /*                                                                  */
4042 /* Name         - mono_arch_patch_code                              */
4043 /*                                                                  */
4044 /* Function     - Process the patch data created during the         */
4045 /*                instruction build process. This resolves jumps,   */
4046 /*                calls, variables etc.                             */
4047 /*                                                                  */
4048 /*------------------------------------------------------------------*/
4049
4050 void
4051 mono_arch_patch_code (MonoMethod *method, MonoDomain *domain, guint8 *code, MonoJumpInfo *ji, gboolean run_cctors)
4052 {
4053         MonoJumpInfo *patch_info;
4054
4055         for (patch_info = ji; patch_info; patch_info = patch_info->next) {
4056                 unsigned char *ip = patch_info->ip.i + code;
4057                 gint32 target = 0;
4058
4059                 switch (patch_info->type) {
4060                 case MONO_PATCH_INFO_BB:
4061                         target = S390_RELATIVE((patch_info->data.bb->native_offset+code),
4062                                                ip);
4063                         ip    += 2;     /* Skip over op-code */
4064                         break;
4065                 case MONO_PATCH_INFO_ABS:
4066                         target = S390_RELATIVE(patch_info->data.target, ip);
4067                         ip    += 2;     /* Skip over op-code */
4068                         break;
4069                 case MONO_PATCH_INFO_LABEL:
4070                         target = S390_RELATIVE((patch_info->data.inst->inst_c0+code),ip);
4071                         ip    += 2;     /* Skip over op-code */
4072                         break;
4073                 case MONO_PATCH_INFO_IP:
4074                         target = ip;
4075                         continue;
4076                 case MONO_PATCH_INFO_METHOD_REL:
4077                         g_assert_not_reached ();
4078                         *((gpointer *)(ip)) = code + patch_info->data.offset;
4079                         continue;
4080                 case MONO_PATCH_INFO_INTERNAL_METHOD: {
4081                         MonoJitICallInfo *mi = mono_find_jit_icall_by_name (patch_info->data.name);
4082                         if (!mi) {
4083                                 g_warning ("unknown MONO_PATCH_INFO_INTERNAL_METHOD %s", patch_info->data.name);
4084                                 g_assert_not_reached ();
4085                         }
4086                         target = S390_RELATIVE(mono_icall_get_wrapper (mi), ip);
4087                         ip    += 2;     /* Skip over op-code */
4088                         break;
4089                 }
4090                 case MONO_PATCH_INFO_METHOD_JUMP:
4091                         g_assert_not_reached ();
4092                         break;
4093                 case MONO_PATCH_INFO_METHOD:
4094                         if (patch_info->data.method == method) {
4095                                 target = S390_RELATIVE(code, ip);
4096                         } else {
4097                                 /* get the trampoline to the method from the domain */
4098                                 target = S390_RELATIVE(mono_arch_create_jit_trampoline (patch_info->data.method), ip);
4099                                 target = mono_arch_create_jit_trampoline(patch_info->data.method);
4100                                 target = S390_RELATIVE(target, ip);
4101                         }
4102                         ip    += 2;     /* Skip over op-code */
4103                         break;
4104                 case MONO_PATCH_INFO_SWITCH: {
4105                         gpointer *table = (gpointer *)patch_info->data.target;
4106                         int i;
4107                         /*------------------------------------------------------*/
4108                         /* ip is pointing at the basr r13,0/j +4 instruction    */
4109                         /* the vtable value follows this (i.e. ip+6)            */
4110                         /*------------------------------------------------------*/
4111                         *((gconstpointer *)(ip+6)) = table;
4112
4113                         for (i = 0; i < patch_info->table_size; i++) {
4114                                 table [i] = (int)patch_info->data.table [i] + code;
4115                         }
4116                         continue;
4117                 }
4118                 case MONO_PATCH_INFO_METHODCONST:
4119                 case MONO_PATCH_INFO_CLASS:
4120                 case MONO_PATCH_INFO_IMAGE:
4121                 case MONO_PATCH_INFO_FIELD:
4122                         target = S390_RELATIVE(patch_info->data.target, ip);
4123                         continue;
4124                 case MONO_PATCH_INFO_R4:
4125                 case MONO_PATCH_INFO_R8:
4126                         g_assert_not_reached ();
4127                         *((gconstpointer *)(ip + 2)) = patch_info->data.target;
4128                         continue;
4129                 case MONO_PATCH_INFO_IID:
4130                         mono_class_init (patch_info->data.klass);
4131                         target = S390_RELATIVE(patch_info->data.klass->interface_id, ip);
4132                         continue;
4133                 case MONO_PATCH_INFO_VTABLE:
4134                         target = S390_RELATIVE(mono_class_vtable (domain, patch_info->data.klass),ip);
4135                         ip += 2;
4136                         continue;
4137                 case MONO_PATCH_INFO_CLASS_INIT:
4138                         target = S390_RELATIVE(mono_create_class_init_trampoline (mono_class_vtable (domain, patch_info->data.klass)), ip);
4139                         ip += 2;
4140                         break;
4141                 case MONO_PATCH_INFO_SFLDA: {
4142                         MonoVTable *vtable = mono_class_vtable (domain, patch_info->data.field->parent);
4143                         if (!vtable->initialized && !(vtable->klass->flags & TYPE_ATTRIBUTE_BEFORE_FIELD_INIT) && mono_class_needs_cctor_run (vtable->klass, method))
4144                                 /* Done by the generated code */
4145                                 ;
4146                         else {
4147                                 if (run_cctors)
4148                                         mono_runtime_class_init (vtable);
4149                         }
4150                         target = S390_RELATIVE((char*)vtable->data + patch_info->data.field->offset, ip);
4151                         ip += 2;
4152                         continue;
4153                 }
4154                 case MONO_PATCH_INFO_EXC_NAME:
4155                         *((gconstpointer *)(ip)) = patch_info->data.name;
4156                         continue;
4157                 case MONO_PATCH_INFO_LDSTR:
4158                         target = mono_ldstr (domain, patch_info->data.token->image,
4159                                              mono_metadata_token_index (patch_info->data.token->token));
4160                         continue;
4161                 case MONO_PATCH_INFO_TYPE_FROM_HANDLE: {
4162                         gpointer handle;
4163                         MonoClass *handle_class;
4164
4165                         handle = mono_ldtoken (patch_info->data.token->image,
4166                                                patch_info->data.token->token,
4167                                                &handle_class, NULL);
4168                         mono_class_init (handle_class);
4169                         mono_class_init (mono_class_from_mono_type (handle));
4170
4171                         target = handle;
4172                         continue;
4173                 }
4174                 case MONO_PATCH_INFO_LDTOKEN: {
4175                         gpointer handle;
4176                         MonoClass *handle_class;
4177
4178                         handle = mono_ldtoken (patch_info->data.token->image,
4179                                                patch_info->data.token->token,
4180                                                &handle_class, NULL);
4181                         mono_class_init (handle_class);
4182
4183                         target = handle;
4184                         continue;
4185                 }
4186                 case MONO_PATCH_INFO_EXC:
4187                         /* everything is dealt with at epilog output time */
4188                         continue;
4189                 default:
4190                         g_assert_not_reached ();
4191                 }
4192                 s390_patch (ip, target);
4193         }
4194 }
4195
4196 /*========================= End of Function ========================*/
4197
4198 /*------------------------------------------------------------------*/
4199 /*                                                                  */
4200 /* Name         - mono_arch_max_epilog_size                         */
4201 /*                                                                  */
4202 /* Function     - Determine the maximum size of the epilog code.    */
4203 /*                                                                  */
4204 /*------------------------------------------------------------------*/
4205
4206 int
4207 mono_arch_max_epilog_size (MonoCompile *cfg)
4208 {
4209         int max_epilog_size = 96;
4210         MonoJumpInfo *patch_info;
4211
4212         if (cfg->method->save_lmf)
4213                 max_epilog_size += 128;
4214
4215         if (mono_jit_trace_calls != NULL)
4216                 max_epilog_size += 128;
4217
4218         if (cfg->prof_options & MONO_PROFILE_ENTER_LEAVE)
4219                 max_epilog_size += 128;
4220
4221         /* count the number of exception infos */
4222
4223         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4224                 if (patch_info->type == MONO_PATCH_INFO_EXC)
4225                         max_epilog_size += 26;
4226         }
4227
4228         return max_epilog_size;
4229 }
4230
4231 /*========================= End of Function ========================*/
4232
4233 /*------------------------------------------------------------------*/
4234 /*                                                                  */
4235 /* Name         - mono_arch_emit_prolog                             */
4236 /*                                                                  */
4237 /* Function     - Create the instruction sequence for a function    */
4238 /*                prolog.                                           */
4239 /*                                                                  */
4240 /*------------------------------------------------------------------*/
4241
4242 guint8 *
4243 mono_arch_emit_prolog (MonoCompile *cfg)
4244 {
4245         MonoMethod *method = cfg->method;
4246         MonoBasicBlock *bb;
4247         MonoMethodSignature *sig;
4248         MonoInst *inst;
4249         int alloc_size, pos, max_offset, i, lmfOffset;
4250         guint8 *code;
4251         CallInfo *cinfo;
4252         size_data sz;
4253         int tracing = 0;
4254
4255         if (mono_jit_trace_calls != NULL && mono_trace_eval (method))
4256                 tracing = 1;
4257
4258         cfg->code_size   = 256;
4259         cfg->native_code = code = g_malloc (cfg->code_size);
4260
4261         s390_stm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4262
4263         if (cfg->flags & MONO_CFG_HAS_ALLOCA) {
4264                 cfg->used_int_regs |= 1 << 11;
4265         }
4266
4267         alloc_size = cfg->stack_offset;
4268 //      if (tracing)
4269 //              alloc_size += S390_TRACE_STACK_SIZE;
4270 //      pos = 0;
4271         /* reserve room to save return value */
4272 //      if (tracing)
4273 //              pos += 8;
4274
4275 //      alloc_size += pos;
4276
4277 //      if (method->save_lmf)
4278 //              alloc_size += sizeof(MonoLMF);
4279
4280 //      alloc_size = S390_ALIGN(alloc_size, S390_STACK_ALIGNMENT);
4281
4282         cfg->stack_usage = alloc_size;
4283         s390_lr   (code, s390_r11, STK_BASE);
4284         if (s390_is_imm16 (-alloc_size)) {
4285                 s390_ahi  (code, STK_BASE, -alloc_size);
4286         } else {
4287                 int stackSize = alloc_size;
4288                 while (stackSize > 32767) {
4289                         s390_ahi  (code, STK_BASE, -32767);
4290                         stackSize -= 32767;
4291                 }
4292                 s390_ahi  (code, STK_BASE, -stackSize);
4293         }
4294         s390_st   (code, s390_r11, 0, STK_BASE, 0);
4295
4296         if (cfg->flags & MONO_CFG_HAS_ALLOCA)
4297                 s390_lr (code, s390_r11, STK_BASE);
4298
4299         /* compute max_offset in order to use short forward jumps
4300          * we always do it on s390 because the immediate displacement
4301          * for jumps is too small
4302          */
4303         max_offset = 0;
4304         for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
4305                 MonoInst *ins = bb->code;
4306                 bb->max_offset = max_offset;
4307
4308                 if (cfg->prof_options & MONO_PROFILE_COVERAGE)
4309                         max_offset += 6;
4310
4311                 while (ins) {
4312                         max_offset += ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
4313                         ins = ins->next;
4314                 }
4315         }
4316
4317         /* load arguments allocated to register from the stack */
4318         sig = method->signature;
4319         pos = 0;
4320
4321         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
4322
4323         if (cinfo->struct_ret) {
4324                 ArgInfo *ainfo = &cinfo->ret;
4325                 inst         = cfg->ret;
4326                 inst->unused = ainfo->vtsize;
4327                 s390_st (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4328         }
4329
4330         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
4331                 ArgInfo *ainfo = cinfo->args + i;
4332                 inst = cfg->varinfo [pos];
4333
4334                 if (inst->opcode == OP_REGVAR) {
4335                         if (ainfo->regtype == RegTypeGeneral)
4336                                 s390_lr (code, inst->dreg, ainfo->reg);
4337                         else if (ainfo->regtype == RegTypeFP) {
4338                                 if (ainfo->size == 4) {
4339                                         s390_ledbr (code, inst->dreg, ainfo->reg);
4340                                 } else {
4341                                         s390_ldr   (code, inst->dreg, ainfo->reg);
4342                                 }
4343                         }
4344                         else if (ainfo->regtype == RegTypeBase) {
4345                                 s390_lr  (code, s390_r13, STK_BASE);
4346                                 s390_ahi (code, s390_r13, alloc_size);
4347                                 s390_l   (code, inst->dreg, 0, s390_r13, ainfo->offset);
4348                         } else
4349                                 g_assert_not_reached ();
4350
4351                         if (cfg->verbose_level > 2)
4352                                 g_print ("Argument %d assigned to register %s\n",
4353                                          pos, mono_arch_regname (inst->dreg));
4354                 } else {
4355                         if (ainfo->regtype == RegTypeGeneral) {
4356                                 if (!((ainfo->reg >= 2) && (ainfo->reg <= 6)))
4357                                         g_assert_not_reached();
4358                                 switch (ainfo->size) {
4359                                 case 1:
4360                                         s390_stc (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4361                                         break;
4362                                 case 2:
4363                                         s390_sth (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4364                                         break;
4365                                 case 8:
4366                                         s390_stm (code, ainfo->reg, ainfo->reg + 1,
4367                                                   inst->inst_basereg, inst->inst_offset);
4368                                         break;
4369                                 default:
4370                                         s390_st  (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4371                                 }
4372                         } else if (ainfo->regtype == RegTypeBase) {
4373                         } else if (ainfo->regtype == RegTypeFP) {
4374                                 if (ainfo->size == 8)
4375                                         s390_std (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4376                                 else if (ainfo->size == 4)
4377                                         s390_ste (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4378                                 else
4379                                         g_assert_not_reached ();
4380                         } else if (ainfo->regtype == RegTypeStructByVal) {
4381                                 int doffset = inst->inst_offset;
4382                                 int reg;
4383                                 if (ainfo->reg != STK_BASE)
4384                                         reg = ainfo->reg;
4385                                 else {
4386                                         reg = s390_r0;
4387                                         s390_lr  (code, s390_r13, STK_BASE);
4388                                         s390_ahi (code, s390_r13, alloc_size);
4389                                 }
4390                                 switch (ainfo->size) {
4391                                         case 1:
4392                                                 if (ainfo->reg == STK_BASE)
4393                                                         s390_ic  (code, reg, 0, s390_r13, ainfo->offset+3);
4394                                                 s390_stc (code, reg, 0, inst->inst_basereg, doffset);
4395                                                 break;
4396                                         case 2:
4397                                                 if (ainfo->reg == STK_BASE)
4398                                                         s390_lh  (code, reg, 0, s390_r13, ainfo->offset+2);
4399                                                 s390_sth (code, reg, 0, inst->inst_basereg, doffset);
4400                                                 break;
4401                                         case 4:
4402                                                 if (ainfo->reg == STK_BASE)
4403                                                         s390_l   (code, reg, 0, s390_r13, ainfo->offset);
4404                                                 s390_st  (code, reg, 0, inst->inst_basereg, doffset);
4405                                                 break;
4406                                         case 8:
4407                                                 if (ainfo->reg == STK_BASE)
4408                                                         s390_lm  (code, s390_r0, s390_r1, s390_r13, ainfo->offset);
4409                                                 s390_stm (code, reg, reg+1, inst->inst_basereg, doffset);
4410                                                 break;
4411                                 }
4412                         } else if (ainfo->regtype == RegTypeStructByAddr) {
4413                                 code = emit_memcpy (code, ainfo->vtsize,
4414                                                     inst->inst_basereg, inst->inst_offset, ainfo->reg, 0);
4415                         } else
4416                                 g_assert_not_reached ();
4417                 }
4418                 pos++;
4419         }
4420
4421         if (method->save_lmf) {
4422                 /*---------------------------------------------------------------*/
4423                 /* Preserve the parameter registers while we fix up the lmf      */
4424                 /*---------------------------------------------------------------*/
4425                 s390_lr (code, s390_r7, s390_r2);
4426                 s390_lr (code, s390_r8, s390_r3);
4427                 s390_lr (code, s390_r9, s390_r4);
4428                 s390_lr (code, s390_r10, s390_r5);
4429
4430                 mono_add_patch_info (cfg, code - cfg->native_code,
4431                                      MONO_PATCH_INFO_INTERNAL_METHOD,
4432                                      (gpointer)"mono_get_lmf_addr");
4433                 /*---------------------------------------------------------------*/
4434                 /* On return from this call r2 have the address of the &lmf      */
4435                 /*---------------------------------------------------------------*/
4436                 s390_brasl (code, s390_r14, 0);
4437
4438                 /*---------------------------------------------------------------*/
4439                 /* we build the MonoLMF structure on the stack - see mini-s390.h */
4440                 /*---------------------------------------------------------------*/
4441                 lmfOffset = alloc_size - sizeof(MonoLMF);
4442
4443                 s390_lr    (code, s390_r13, cfg->frame_reg);
4444                 s390_ahi   (code, s390_r13, lmfOffset);
4445
4446                 /*---------------------------------------------------------------*/
4447                 /* Set lmf.lmf_addr = jit_tls->lmf                               */
4448                 /*---------------------------------------------------------------*/
4449                 s390_st    (code, s390_r2, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4450
4451                 /*---------------------------------------------------------------*/
4452                 /* Get current lmf                                               */
4453                 /*---------------------------------------------------------------*/
4454                 s390_l     (code, s390_r0, 0, s390_r2, 0);
4455
4456                 /*---------------------------------------------------------------*/
4457                 /* Set our lmf as the current lmf                                */
4458                 /*---------------------------------------------------------------*/
4459                 s390_st    (code, s390_r13, 0, s390_r2, 0);
4460
4461                 /*---------------------------------------------------------------*/
4462                 /* Have our lmf.previous_lmf point to the last lmf               */
4463                 /*---------------------------------------------------------------*/
4464                 s390_st    (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4465
4466                 /*---------------------------------------------------------------*/
4467                 /* save method info                                              */
4468                 /*---------------------------------------------------------------*/
4469                 s390_basr  (code, s390_r1, 0);
4470                 s390_j     (code, 4);
4471                 s390_word  (code, method);
4472                 s390_l     (code, s390_r1, 0, s390_r1, 4);
4473                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, method));
4474
4475                 /*---------------------------------------------------------------*/
4476                 /* save the current IP                                           */
4477                 /*---------------------------------------------------------------*/
4478                 s390_lr    (code, s390_r1, cfg->frame_reg);
4479                 s390_ahi   (code, s390_r1, alloc_size);
4480                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
4481                 s390_l     (code, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
4482                 s390_la    (code, s390_r1, 0, s390_r1, 0);
4483                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
4484
4485                 /*---------------------------------------------------------------*/
4486                 /* Restore the parameter registers now that we've set up the lmf */
4487                 /*---------------------------------------------------------------*/
4488                 s390_lr (code, s390_r2, s390_r7);
4489                 s390_lr (code, s390_r3, s390_r8);
4490                 s390_lr (code, s390_r4, s390_r9);
4491                 s390_lr (code, s390_r5, s390_r10);
4492         }
4493
4494         if (tracing)
4495                 code = mono_arch_instrument_prolog (cfg, enter_method, code, TRUE);
4496
4497         cfg->code_len = code - cfg->native_code;
4498         g_free (cinfo);
4499
4500         return code;
4501 }
4502
4503 /*========================= End of Function ========================*/
4504
4505 /*------------------------------------------------------------------*/
4506 /*                                                                  */
4507 /* Name         - mono_arch_emit_epilog                             */
4508 /*                                                                  */
4509 /* Function     - Emit the instructions for a function epilog.      */
4510 /*                                                                  */
4511 /*------------------------------------------------------------------*/
4512
4513 void
4514 mono_arch_emit_epilog (MonoCompile *cfg)
4515 {
4516         MonoJumpInfo *patch_info;
4517         MonoMethod *method = cfg->method;
4518         MonoMethodSignature *sig = method->signature;
4519         MonoInst *inst;
4520         int i, lmfOffset, tracing = 0;
4521         guint8 *code;
4522
4523         code = cfg->native_code + cfg->code_len;
4524
4525         if (mono_jit_trace_calls != NULL && mono_trace_eval (method)) {
4526                 code = mono_arch_instrument_epilog (cfg, leave_method, code, TRUE);
4527                 tracing = 1;
4528         }
4529
4530         if (method->save_lmf) {
4531                 s390_lr  (code, s390_r13, cfg->frame_reg);
4532
4533                 lmfOffset = cfg->stack_usage -  sizeof(MonoLMF);
4534
4535                 /*-------------------------------------------------*/
4536                 /* r13 = my lmf                                    */
4537                 /*-------------------------------------------------*/
4538                 s390_ahi (code, s390_r13, lmfOffset);
4539
4540                 /*-------------------------------------------------*/
4541                 /* r6 = &jit_tls->lmf                              */
4542                 /*-------------------------------------------------*/
4543                 s390_l   (code, s390_r6, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4544
4545                 /*-------------------------------------------------*/
4546                 /* r0 = lmf.previous_lmf                           */
4547                 /*-------------------------------------------------*/
4548                 s390_l   (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4549
4550                 /*-------------------------------------------------*/
4551                 /* jit_tls->lmf = previous_lmf                     */
4552                 /*-------------------------------------------------*/
4553                 s390_l   (code, s390_r13, 0, s390_r6, 0);
4554                 s390_st  (code, s390_r0, 0, s390_r6, 0);
4555         }
4556
4557         if (cfg->frame_reg != STK_BASE)
4558                 s390_lr  (code, STK_BASE, cfg->frame_reg);
4559
4560         s390_ahi (code, STK_BASE, cfg->stack_usage);
4561         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4562         s390_br  (code, s390_r14);
4563
4564         /* add code to raise exceptions */
4565         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4566                 switch (patch_info->type) {
4567                 case MONO_PATCH_INFO_EXC: {
4568                         /*-----------------------------------------------------*/
4569                         /* Patch the branch in epilog to come here             */
4570                         /*-----------------------------------------------------*/
4571                         s390_patch (patch_info->ip.i+cfg->native_code+2,
4572                                     S390_RELATIVE(code,patch_info->ip.i+cfg->native_code));
4573                         /*-----------------------------------------------------*/
4574                         /* Patch the parameter passed to the handler           */
4575                         /*-----------------------------------------------------*/
4576                         s390_basr (code, s390_r13, 0);
4577                         s390_j    (code, 4);
4578                         mono_add_patch_info (cfg, code - cfg->native_code,
4579                                              MONO_PATCH_INFO_EXC_NAME,
4580                                              patch_info->data.target);
4581                         s390_word (code, 0);
4582                         /*-----------------------------------------------------*/
4583                         /* Load the return address and the parameter register  */
4584                         /*-----------------------------------------------------*/
4585                         s390_larl (code, s390_r14, S390_RELATIVE((patch_info->ip.i +
4586                                                    cfg->native_code + 8), code));
4587                         s390_l    (code, s390_r2, 0, s390_r13, 4);
4588                         /*-----------------------------------------------------*/
4589                         /* Reuse the current patch to set the jump             */
4590                         /*-----------------------------------------------------*/
4591                         patch_info->type      = MONO_PATCH_INFO_INTERNAL_METHOD;
4592                         patch_info->data.name = "mono_arch_throw_exception_by_name";
4593                         patch_info->ip.i      = code - cfg->native_code;
4594                         s390_jcl  (code, S390_CC_UN, 0);
4595                         break;
4596                 }
4597                 default:
4598                         /* do nothing */
4599                         break;
4600                 }
4601         }
4602
4603         cfg->code_len = code - cfg->native_code;
4604
4605         g_assert (cfg->code_len < cfg->code_size);
4606
4607 }
4608
4609 /*========================= End of Function ========================*/
4610
4611 /*------------------------------------------------------------------*/
4612 /*                                                                  */
4613 /* Name         - mono_arch_setup_jit_tls_data                      */
4614 /*                                                                  */
4615 /* Function     - Setup the JIT's Thread Level Specific Data.       */
4616 /*                                                                  */
4617 /*------------------------------------------------------------------*/
4618
4619 void
4620 mono_arch_setup_jit_tls_data (MonoJitTlsData *tls)
4621 {
4622 }
4623
4624 /*========================= End of Function ========================*/
4625
4626 /*------------------------------------------------------------------*/
4627 /*                                                                  */
4628 /* Name         - mono_arch_free_jit_tls_data                       */
4629 /*                                                                  */
4630 /* Function     - Free tls data.                                    */
4631 /*                                                                  */
4632 /*------------------------------------------------------------------*/
4633
4634 void
4635 mono_arch_free_jit_tls_data (MonoJitTlsData *tls)
4636 {
4637 }
4638
4639 /*========================= End of Function ========================*/
4640
4641 /*------------------------------------------------------------------*/
4642 /*                                                                  */
4643 /* Name         - mono_arch_emit_this_vret_args                     */
4644 /*                                                                  */
4645 /* Function     -                                                   */
4646 /*                                                                  */
4647 /*------------------------------------------------------------------*/
4648
4649 void
4650 mono_arch_emit_this_vret_args (MonoCompile *cfg, MonoCallInst *inst, int this_reg, int this_type, int vt_reg)
4651 {
4652         int this_dreg = s390_r2;
4653
4654         if (vt_reg != -1)
4655                 this_dreg = s390_r3;
4656
4657         /* add the this argument */
4658         if (this_reg != -1) {
4659                 MonoInst *this;
4660                 MONO_INST_NEW (cfg, this, OP_SETREG);
4661                 this->type = this_type;
4662                 this->sreg1 = this_reg;
4663                 this->dreg = this_dreg;
4664                 mono_bblock_add_inst (cfg->cbb, this);
4665         }
4666
4667         if (vt_reg != -1) {
4668                 MonoInst *vtarg;
4669                 MONO_INST_NEW (cfg, vtarg, OP_SETREG);
4670                 vtarg->type = STACK_MP;
4671                 vtarg->sreg1 = vt_reg;
4672                 vtarg->dreg = s390_r2;
4673                 mono_bblock_add_inst (cfg->cbb, vtarg);
4674         }
4675 }
4676
4677 /*========================= End of Function ========================*/
4678
4679 /*------------------------------------------------------------------*/
4680 /*                                                                  */
4681 /* Name         - mono_arch_get_opcode_for_method                   */
4682 /*                                                                  */
4683 /* Function     - Check for opcodes we can handle directly in       */
4684 /*                hardware.                                         */
4685 /*                                                                  */
4686 /*------------------------------------------------------------------*/
4687
4688 gint
4689 mono_arch_get_opcode_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsig, MonoInst **args)
4690 {
4691         if (cmethod->klass == mono_defaults.math_class) {
4692                 if (strcmp (cmethod->name, "Sqrt") == 0)
4693                         return OP_SQRT;
4694         }
4695         return -1;
4696 }
4697
4698 /*========================= End of Function ========================*/
4699
4700 /*------------------------------------------------------------------*/
4701 /*                                                                  */
4702 /* Name         - mono_arch_print_tree                              */
4703 /*                                                                  */
4704 /* Function     - Print platform-specific opcode details.           */
4705 /*                                                                  */
4706 /* Returns      - 1 - opcode details have been printed              */
4707 /*                0 - opcode details have not been printed          */
4708 /*                                                                  */
4709 /*------------------------------------------------------------------*/
4710
4711 gboolean
4712 mono_arch_print_tree (MonoInst *tree, int arity)
4713 {
4714         gboolean done;
4715
4716         switch (tree->opcode) {
4717                 case OP_S390_LOADARG:
4718                 case OP_S390_ARGPTR:
4719                 case OP_S390_STKARG:
4720                         printf ("[0x%x(%s)]", tree->inst_offset,
4721                                 mono_arch_regname (tree->inst_basereg));
4722                         done = 1;
4723                         break;
4724                 default:
4725                         done = 0;
4726         }
4727         return (done);
4728 }
4729
4730 /*========================= End of Function ========================*/
4731
4732 /*------------------------------------------------------------------*/
4733 /*                                                                  */
4734 /* Name         - mono_arch_regalloc_cost                           */
4735 /*                                                                  */
4736 /* Function     - Determine the cost, in the number of memory       */
4737 /*                references, of the action of allocating the var-  */
4738 /*                iable VMV into a register during global register  */
4739 /*                allocation.                                       */
4740 /*                                                                  */
4741 /* Returns      - Cost                                              */
4742 /*                                                                  */
4743 /*------------------------------------------------------------------*/
4744
4745 guint32
4746 mono_arch_regalloc_cost (MonoCompile *cfg, MonoMethodVar *vmv)
4747 {
4748         /* FIXME: */
4749         return 3;
4750 }
4751
4752 /*========================= End of Function ========================*/