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         /*
1256          * FIXME: we'll use the frame register also for any method that has
1257          * filter clauses. This way, when the handlers are called,
1258          * the code will reference local variables using the frame reg instead of
1259          * the stack pointer: if we had to restore the stack pointer, we'd
1260          * corrupt the method frames that are already on the stack (since
1261          * filters get called before stack unwinding happens) when the filter
1262          * code would call any method.
1263          */
1264         if (m->flags & MONO_CFG_HAS_ALLOCA)
1265                 frame_reg = s390_r11;
1266         m->frame_reg = frame_reg;
1267
1268         header  = ((MonoMethodNormal *)m->method)->header;
1269
1270         sig     = m->method->signature;
1271
1272         cinfo   = calculate_sizes (sig, &sz, sig->pinvoke);
1273
1274         if (cinfo->struct_ret) {
1275                 m->ret->opcode = OP_REGVAR;
1276                 m->ret->inst_c0 = s390_r2;
1277         } else {
1278                 /* FIXME: handle long and FP values */
1279                 switch (sig->ret->type) {
1280                 case MONO_TYPE_VOID:
1281                         break;
1282                 default:
1283                         m->ret->opcode = OP_REGVAR;
1284                         m->ret->dreg    = s390_r2;
1285                         break;
1286                 }
1287         }
1288
1289         /*--------------------------------------------------------------*/
1290         /* local vars are at a positive offset from the stack pointer   */
1291         /*                                                              */
1292         /* also note that if the function uses alloca, we use s390_r11  */
1293         /* to point at the local variables.                             */
1294         /* add parameter area size for called functions                 */
1295         /*--------------------------------------------------------------*/
1296         offset = (m->param_area + S390_MINIMAL_STACK_SIZE);
1297
1298         if (cinfo->struct_ret) {
1299                 inst               = m->ret;
1300                 offset             = S390_ALIGN(offset, sizeof(gpointer));
1301                 inst->inst_offset  = offset;
1302                 inst->opcode       = OP_REGOFFSET;
1303                 inst->inst_basereg = frame_reg;
1304                 offset            += sizeof(gpointer);
1305         }
1306
1307         curinst = m->locals_start;
1308         for (iVar = curinst; iVar < m->num_varinfo; ++iVar) {
1309                 inst = m->varinfo [iVar];
1310                 if (inst->opcode == OP_REGVAR)
1311                         continue;
1312
1313                 /* inst->unused indicates native sized value types, this is used by the
1314                 * pinvoke wrappers when they call functions returning structure */
1315                 if (inst->unused && MONO_TYPE_ISSTRUCT (inst->inst_vtype))
1316                         size = mono_class_native_size (inst->inst_vtype->data.klass, &align);
1317                 else
1318                         size = mono_type_size (inst->inst_vtype, &align);
1319
1320                 offset             = S390_ALIGN(offset, align);
1321                 inst->inst_offset  = offset;
1322                 inst->opcode       = OP_REGOFFSET;
1323                 inst->inst_basereg = frame_reg;
1324                 offset            += size;
1325                 //g_print ("allocating local %d to %d\n", i, inst->inst_offset);
1326         }
1327
1328         curinst = 0;
1329         if (sig->hasthis) {
1330                 inst = m->varinfo [curinst];
1331                 if (inst->opcode != OP_REGVAR) {
1332                         inst->opcode       = OP_REGOFFSET;
1333                         inst->inst_basereg = frame_reg;
1334                         offset             = S390_ALIGN(offset, sizeof(gpointer));
1335                         inst->inst_offset  = offset;
1336                         offset            += sizeof (gpointer);
1337                 }
1338                 curinst++;
1339                 sArg = 1;
1340         } else
1341                 sArg = 0;
1342
1343         eArg = sig->param_count + sArg;
1344
1345         for (iParm = sArg; iParm < eArg; ++iParm) {
1346                 inst = m->varinfo [curinst];
1347                 if (inst->opcode != OP_REGVAR) {
1348                         if (cinfo->args[iParm].regtype == RegTypeStructByVal) {
1349                                 if (cinfo->args[iParm].vtsize != 0) {
1350                                         inst->opcode       = OP_S390_LOADARG;
1351                                         inst->inst_basereg = frame_reg;
1352                                         size               = sizeof(long);
1353                                         offset             = S390_ALIGN(offset, size);
1354                                         inst->inst_offset  = offset;
1355                                 } else {
1356                                         inst->opcode       = OP_S390_ARGPTR;
1357                                         inst->inst_basereg = frame_reg;
1358                                         size               = cinfo->args[iParm].size;
1359                                         offset             = S390_ALIGN(offset, size);
1360                                         inst->inst_offset  = offset;
1361                                 }
1362                         } else {
1363                                 if (cinfo->args[iParm].reg != STK_BASE) {
1364                                         inst->opcode       = OP_REGOFFSET;
1365                                         inst->inst_basereg = frame_reg;
1366                                         size               = (cinfo->args[iParm].size < 8
1367                                                               ? sizeof(long)
1368                                                               : sizeof(long long));
1369                                         offset             = S390_ALIGN(offset, size);
1370                                         inst->inst_offset  = offset;
1371                                 } else {
1372                                         inst->opcode       = OP_S390_STKARG;
1373                                         inst->inst_basereg = frame_reg;
1374                                         size               = (cinfo->args[iParm].size < 4
1375                                                               ? 4 - cinfo->args[iParm].size
1376                                                               : 0);
1377                                         inst->inst_offset  = cinfo->args[iParm].offset +
1378                                                              size;
1379 //                                      inst->unused       = stackOffset;
1380                                         inst->unused       = 0;
1381                                         size               = sizeof(long);
1382                                 }
1383                         }
1384                         offset += size;
1385                 }
1386                 curinst++;
1387         }
1388
1389         /*------------------------------------------------------*/
1390         /* Allow space for the trace method stack area if needed*/
1391         /*------------------------------------------------------*/
1392         if (mono_jit_trace_calls != NULL && mono_trace_eval (m))
1393                 offset += S390_TRACE_STACK_SIZE;
1394
1395         /*------------------------------------------------------*/
1396         /* Reserve space to save LMF and caller saved registers */
1397         /*------------------------------------------------------*/
1398         if (m->method->save_lmf)
1399                 offset += sizeof (MonoLMF);
1400
1401         /*------------------------------------------------------*/
1402         /* align the offset                                     */
1403         /*------------------------------------------------------*/
1404         m->stack_offset = S390_ALIGN(offset, S390_STACK_ALIGNMENT);
1405
1406 }
1407
1408 /*========================= End of Function ========================*/
1409
1410 /*------------------------------------------------------------------*/
1411 /*                                                                  */
1412 /* Name         - mono_arch_call_opcode                             */
1413 /*                                                                  */
1414 /* Function     - Take the arguments and generate the arch-specific */
1415 /*                instructions to properly call the function. This  */
1416 /*                includes pushing, moving argments to the correct  */
1417 /*                etc.                                              */
1418 /*                                                                  */
1419 /* Note         - FIXME: We need an alignment solution for          */
1420 /*                enter_method and mono_arch_call_opcode, currently */
1421 /*                alignment in mono_arch_call_opcode is computed    */
1422 /*                without arch_get_argument_info.                   */
1423 /*                                                                  */
1424 /*------------------------------------------------------------------*/
1425
1426 MonoCallInst*
1427 mono_arch_call_opcode (MonoCompile *cfg, MonoBasicBlock* bb, MonoCallInst *call, int is_virtual) {
1428         MonoInst *arg, *in;
1429         MonoMethodSignature *sig;
1430         int i, n, lParamArea;
1431         CallInfo *cinfo;
1432         ArgInfo *ainfo;
1433         size_data sz;
1434
1435         sig = call->signature;
1436         n = sig->param_count + sig->hasthis;
1437
1438         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
1439         if (cinfo->struct_ret)
1440                 call->used_iregs |= 1 << cinfo->struct_ret;
1441
1442         for (i = 0; i < n; ++i) {
1443                 ainfo = cinfo->args + i;
1444                 if (is_virtual && i == 0) {
1445                         /* the argument will be attached to the call instrucion */
1446                         in = call->args [i];
1447                         call->used_iregs |= 1 << ainfo->reg;
1448                 } else {
1449                         MONO_INST_NEW (cfg, arg, OP_OUTARG);
1450                         in = call->args [i];
1451                         arg->cil_code  = in->cil_code;
1452                         arg->inst_left = in;
1453                         arg->type      = in->type;
1454                         /* prepend, we'll need to reverse them later */
1455                         arg->next      = call->out_args;
1456                         call->out_args = arg;
1457                         if (ainfo->regtype == RegTypeGeneral) {
1458                                 arg->unused = ainfo->reg;
1459                                 call->used_iregs |= 1 << ainfo->reg;
1460                                 if (arg->type == STACK_I8)
1461                                         call->used_iregs |= 1 << (ainfo->reg + 1);
1462                         } else if (ainfo->regtype == RegTypeStructByAddr) {
1463                                 arg->unused = ainfo->reg;
1464                                 call->used_iregs |= 1 << ainfo->reg;
1465                         } else if (ainfo->regtype == RegTypeStructByVal) {
1466                                 if (ainfo->reg != STK_BASE) {
1467                                         switch (ainfo->size) {
1468                                         case 0:
1469                                         case 1:
1470                                         case 2:
1471                                         case 4:
1472                                                 call->used_iregs |= 1 << ainfo->reg;
1473                                                 break;
1474                                         case 8:
1475                                                 call->used_iregs |= 1 << ainfo->reg;
1476                                                 call->used_iregs |= 1 << (ainfo->reg+1);
1477                                                 break;
1478                                         }
1479                                 }
1480                                 arg->sreg2    = ainfo->reg;
1481                                 arg->opcode   = OP_OUTARG_VT;
1482                                 if (ainfo->vtsize != 0)
1483                                         arg->unused = -ainfo->vtsize;
1484                                 else
1485                                         arg->unused = ainfo->size;
1486                                 arg->inst_imm     = ainfo->offset;
1487                                 arg->sreg1        = ainfo->offparm;
1488                         } else if (ainfo->regtype == RegTypeBase) {
1489                                 arg->opcode = OP_OUTARG;
1490                                 arg->unused = ainfo->reg | (ainfo->size << 8);
1491                                 arg->inst_imm = ainfo->offset;
1492                         } else if (ainfo->regtype == RegTypeFP) {
1493                                 arg->opcode = OP_OUTARG_R8;
1494                                 arg->unused = ainfo->reg;
1495                                 call->used_fregs |= 1 << ainfo->reg;
1496                                 if (ainfo->size == 4) {
1497                                         /* we reduce the precision */
1498                                         MonoInst *conv;
1499                                         MONO_INST_NEW (cfg, conv, OP_FCONV_TO_R4);
1500                                         conv->inst_left = arg->inst_left;
1501                                         arg->inst_left = conv;
1502                                 }
1503                         } else {
1504                                 g_assert_not_reached ();
1505                         }
1506                 }
1507         }
1508         /*
1509          * Reverse the call->out_args list.
1510          */
1511         {
1512                 MonoInst *prev = NULL, *list = call->out_args, *next;
1513                 while (list) {
1514                         next = list->next;
1515                         list->next = prev;
1516                         prev = list;
1517                         list = next;
1518                 }
1519                 call->out_args = prev;
1520         }
1521         call->stack_usage = cinfo->stack_usage;
1522
1523         lParamArea        = cinfo->stack_usage - S390_MINIMAL_STACK_SIZE;
1524         cfg->param_area   = MAX (cfg->param_area, lParamArea);
1525         cfg->flags       |= MONO_CFG_HAS_CALLS;
1526         /*----------------------------------------------------------*/
1527         /* should set more info in call, such as the stack space    */
1528         /* used by the args that needs to be added back to esp      */
1529         /*----------------------------------------------------------*/
1530
1531         g_free (cinfo);
1532         return call;
1533 }
1534
1535 /*========================= End of Function ========================*/
1536
1537 /*------------------------------------------------------------------*/
1538 /*                                                                  */
1539 /* Name         - mono_arch_instrument_mem_needs                    */
1540 /*                                                                  */
1541 /* Function     - Allow tracing to work with this interface (with   */
1542 /*                an optional argument).                            */
1543 /*                                                                  */
1544 /*------------------------------------------------------------------*/
1545
1546 void
1547 mono_arch_instrument_mem_needs (MonoMethod *method, int *stack, int *code)
1548 {
1549         /* no stack room needed now (may be needed for FASTCALL-trace support) */
1550         *stack = 0;
1551         /* split prolog-epilog requirements? */
1552         *code = 50; /* max bytes needed: check this number */
1553 }
1554
1555 /*========================= End of Function ========================*/
1556
1557 /*------------------------------------------------------------------*/
1558 /*                                                                  */
1559 /* Name         - mono_arch_instrument_prolog                       */
1560 /*                                                                  */
1561 /* Function     - Create an "instrumented" prolog.                  */
1562 /*                                                                  */
1563 /*------------------------------------------------------------------*/
1564
1565 void*
1566 mono_arch_instrument_prolog (MonoCompile *cfg, void *func, void *p,
1567                              gboolean enable_arguments)
1568 {
1569         guchar *code = p;
1570         int     parmOffset,
1571                 fpOffset;
1572
1573         parmOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1574         if (cfg->method->save_lmf)
1575                 parmOffset -= sizeof(MonoLMF);
1576         fpOffset   = parmOffset + (5*sizeof(gint32));
1577
1578         s390_stm  (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1579         s390_std  (code, s390_f0, 0, STK_BASE, fpOffset);
1580         s390_std  (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1581         s390_std  (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1582         s390_basr (code, s390_r13, 0);
1583         s390_j    (code, 6);
1584         s390_word (code, cfg->method);
1585         s390_word (code, func);
1586         s390_l    (code, s390_r2, 0, s390_r13, 4);
1587         s390_la   (code, s390_r3, 0, STK_BASE, parmOffset);
1588         s390_lr   (code, s390_r4, STK_BASE);
1589         s390_ahi  (code, s390_r4, cfg->stack_usage);
1590         s390_l    (code, s390_r1, 0, s390_r13, 8);
1591         s390_basr (code, s390_r14, s390_r1);
1592         s390_ld   (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1593         s390_ld   (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1594         s390_ld   (code, s390_f0, 0, STK_BASE, fpOffset);
1595         s390_lm   (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1596
1597         return code;
1598 }
1599
1600 /*========================= End of Function ========================*/
1601
1602 /*------------------------------------------------------------------*/
1603 /*                                                                  */
1604 /* Name         - mono_arch_instrument_epilog                       */
1605 /*                                                                  */
1606 /* Function     - Create an epilog that will handle the returned    */
1607 /*                values used in instrumentation.                   */
1608 /*                                                                  */
1609 /*------------------------------------------------------------------*/
1610
1611 void*
1612 mono_arch_instrument_epilog (MonoCompile *cfg, void *func, void *p, gboolean enable_arguments)
1613 {
1614         guchar     *code = p;
1615         int        save_mode = SAVE_NONE,
1616                    saveOffset;
1617         MonoMethod *method = cfg->method;
1618         int        rtype = method->signature->ret->type;
1619
1620         saveOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1621         if (method->save_lmf)
1622                 saveOffset -= sizeof(MonoLMF);
1623
1624 handle_enum:
1625         switch (rtype) {
1626         case MONO_TYPE_VOID:
1627                 /* special case string .ctor icall */
1628                 if (strcmp (".ctor", method->name) && method->klass == mono_defaults.string_class)
1629                         save_mode = SAVE_ONE;
1630                 else
1631                         save_mode = SAVE_NONE;
1632                 break;
1633         case MONO_TYPE_I8:
1634         case MONO_TYPE_U8:
1635                 save_mode = SAVE_TWO;
1636                 break;
1637         case MONO_TYPE_R4:
1638         case MONO_TYPE_R8:
1639                 save_mode = SAVE_FP;
1640                 break;
1641         case MONO_TYPE_VALUETYPE:
1642                 if (method->signature->ret->data.klass->enumtype) {
1643                         rtype = method->signature->ret->data.klass->enum_basetype->type;
1644                         goto handle_enum;
1645                 }
1646                 save_mode = SAVE_STRUCT;
1647                 break;
1648         default:
1649                 save_mode = SAVE_ONE;
1650                 break;
1651         }
1652
1653         switch (save_mode) {
1654         case SAVE_TWO:
1655                 s390_stm (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1656                 if (enable_arguments) {
1657                         s390_lr (code, s390_r4, s390_r3);
1658                         s390_lr (code, s390_r3, s390_r2);
1659                 }
1660                 break;
1661         case SAVE_ONE:
1662                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1663                 if (enable_arguments) {
1664                         s390_lr (code, s390_r3, s390_r2);
1665                 }
1666                 break;
1667         case SAVE_FP:
1668                 s390_std (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1669                 if (enable_arguments) {
1670                         /* FIXME: what reg?  */
1671                         s390_ldr (code, s390_f2, s390_f0);
1672                         s390_lm  (code, s390_r3, s390_r4, cfg->frame_reg, saveOffset);
1673                 }
1674                 break;
1675         case SAVE_STRUCT:
1676                 s390_st (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1677                 if (enable_arguments) {
1678                         s390_l (code, s390_r3, 0, cfg->frame_reg,
1679                                 S390_MINIMAL_STACK_SIZE+cfg->param_area);
1680                 }
1681                 break;
1682         case SAVE_NONE:
1683         default:
1684                 break;
1685         }
1686
1687         s390_basr (code, s390_r13, 0);
1688         s390_j    (code, 6);
1689         s390_word (code, cfg->method);
1690         s390_word (code, func);
1691         s390_l    (code, s390_r2, 0, s390_r13, 4);
1692         s390_l    (code, s390_r1, 0, s390_r13, 8);
1693         s390_basr (code, s390_r14, s390_r1);
1694
1695         switch (save_mode) {
1696         case SAVE_TWO:
1697                 s390_lm  (code, s390_r2, s390_r3, cfg->frame_reg, saveOffset);
1698                 break;
1699         case SAVE_ONE:
1700                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1701                 break;
1702         case SAVE_FP:
1703                 s390_ld  (code, s390_f0, 0, cfg->frame_reg, saveOffset);
1704                 break;
1705         case SAVE_STRUCT:
1706                 s390_l   (code, s390_r2, 0, cfg->frame_reg, saveOffset);
1707                 break;
1708         case SAVE_NONE:
1709         default:
1710                 break;
1711         }
1712
1713         return code;
1714 }
1715
1716 /*========================= End of Function ========================*/
1717
1718 /*------------------------------------------------------------------*/
1719 /*                                                                  */
1720 /* Name         - peephole_pass                                     */
1721 /*                                                                  */
1722 /* Function     - Form a peephole pass at the code looking for      */
1723 /*                simple optimizations.                             */
1724 /*                                                                  */
1725 /*------------------------------------------------------------------*/
1726
1727 static void
1728 peephole_pass (MonoCompile *cfg, MonoBasicBlock *bb)
1729 {
1730         MonoInst *ins, *last_ins = NULL;
1731         ins = bb->code;
1732
1733         while (ins) {
1734
1735                 switch (ins->opcode) {
1736                 case OP_MUL_IMM:
1737                         /* remove unnecessary multiplication with 1 */
1738                         if (ins->inst_imm == 1) {
1739                                 if (ins->dreg != ins->sreg1) {
1740                                         ins->opcode = OP_MOVE;
1741                                 } else {
1742                                         last_ins->next = ins->next;
1743                                         ins = ins->next;
1744                                         continue;
1745                                 }
1746                         }
1747                         break;
1748                 case OP_LOAD_MEMBASE:
1749                 case OP_LOADI4_MEMBASE:
1750                         /*
1751                          * OP_STORE_MEMBASE_REG reg, offset(basereg)
1752                          * OP_LOAD_MEMBASE offset(basereg), reg
1753                          */
1754                         if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_REG
1755                                          || last_ins->opcode == OP_STORE_MEMBASE_REG) &&
1756                             ins->inst_basereg == last_ins->inst_destbasereg &&
1757                             ins->inst_offset == last_ins->inst_offset) {
1758                                 if (ins->dreg == last_ins->sreg1) {
1759                                         last_ins->next = ins->next;
1760                                         ins = ins->next;
1761                                         continue;
1762                                 } else {
1763                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1764                                         ins->opcode = OP_MOVE;
1765                                         ins->sreg1 = last_ins->sreg1;
1766                                 }
1767
1768                         /*
1769                          * Note: reg1 must be different from the basereg in the second load
1770                          * OP_LOAD_MEMBASE offset(basereg), reg1
1771                          * OP_LOAD_MEMBASE offset(basereg), reg2
1772                          * -->
1773                          * OP_LOAD_MEMBASE offset(basereg), reg1
1774                          * OP_MOVE reg1, reg2
1775                          */
1776                         } if (last_ins && (last_ins->opcode == OP_LOADI4_MEMBASE
1777                                            || last_ins->opcode == OP_LOAD_MEMBASE) &&
1778                               ins->inst_basereg != last_ins->dreg &&
1779                               ins->inst_basereg == last_ins->inst_basereg &&
1780                               ins->inst_offset == last_ins->inst_offset) {
1781
1782                                 if (ins->dreg == last_ins->dreg) {
1783                                         last_ins->next = ins->next;
1784                                         ins = ins->next;
1785                                         continue;
1786                                 } else {
1787                                         ins->opcode = OP_MOVE;
1788                                         ins->sreg1 = last_ins->dreg;
1789                                 }
1790
1791                                 //g_assert_not_reached ();
1792
1793 #if 0
1794                         /*
1795                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1796                          * OP_LOAD_MEMBASE offset(basereg), reg
1797                          * -->
1798                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1799                          * OP_ICONST reg, imm
1800                          */
1801                         } else if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_IMM
1802                                                 || last_ins->opcode == OP_STORE_MEMBASE_IMM) &&
1803                                    ins->inst_basereg == last_ins->inst_destbasereg &&
1804                                    ins->inst_offset == last_ins->inst_offset) {
1805                                 //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1806                                 ins->opcode = OP_ICONST;
1807                                 ins->inst_c0 = last_ins->inst_imm;
1808                                 g_assert_not_reached (); // check this rule
1809 #endif
1810                         }
1811                         break;
1812                 case OP_LOADU1_MEMBASE:
1813                 case OP_LOADI1_MEMBASE:
1814                         if (last_ins && (last_ins->opcode == OP_STOREI1_MEMBASE_REG) &&
1815                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1816                                         ins->inst_offset == last_ins->inst_offset) {
1817                                 if (ins->dreg == last_ins->sreg1) {
1818                                         last_ins->next = ins->next;
1819                                         ins = ins->next;
1820                                         continue;
1821                                 } else {
1822                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1823                                         ins->opcode = OP_MOVE;
1824                                         ins->sreg1 = last_ins->sreg1;
1825                                 }
1826                         }
1827                         break;
1828                 case OP_LOADU2_MEMBASE:
1829                 case OP_LOADI2_MEMBASE:
1830                         if (last_ins && (last_ins->opcode == OP_STOREI2_MEMBASE_REG) &&
1831                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1832                                         ins->inst_offset == last_ins->inst_offset) {
1833                                 if (ins->dreg == last_ins->sreg1) {
1834                                         last_ins->next = ins->next;
1835                                         ins = ins->next;
1836                                         continue;
1837                                 } else {
1838                                         ins->opcode = OP_MOVE;
1839                                         ins->sreg1 = last_ins->sreg1;
1840                                 }
1841                         }
1842                         break;
1843                 case CEE_CONV_I4:
1844                 case CEE_CONV_U4:
1845                 case OP_MOVE:
1846                         /*
1847                          * OP_MOVE reg, reg
1848                          */
1849                         if (ins->dreg == ins->sreg1) {
1850                                 if (last_ins)
1851                                         last_ins->next = ins->next;
1852                                 ins = ins->next;
1853                                 continue;
1854                         }
1855                         /*
1856                          * OP_MOVE sreg, dreg
1857                          * OP_MOVE dreg, sreg
1858                          */
1859                         if (last_ins && last_ins->opcode == OP_MOVE &&
1860                             ins->sreg1 == last_ins->dreg &&
1861                             ins->dreg == last_ins->sreg1) {
1862                                 last_ins->next = ins->next;
1863                                 ins = ins->next;
1864                                 continue;
1865                         }
1866                         break;
1867                 }
1868                 last_ins = ins;
1869                 ins = ins->next;
1870         }
1871         bb->last_ins = last_ins;
1872 }
1873
1874 /*========================= End of Function ========================*/
1875
1876 /*------------------------------------------------------------------*/
1877 /*                                                                  */
1878 /* Name         - mono_spillvar_offset                              */
1879 /*                                                                  */
1880 /* Function     - Returns the offset used by spillvar. It allocates */
1881 /*                a new spill variable if necessary.                */
1882 /*                                                                  */
1883 /*------------------------------------------------------------------*/
1884
1885 static int
1886 mono_spillvar_offset (MonoCompile *cfg, int spillvar)
1887 {
1888         MonoSpillInfo **si, *info;
1889         int i = 0;
1890
1891         si = &cfg->spill_info;
1892
1893         while (i <= spillvar) {
1894
1895                 if (!*si) {
1896                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1897                         info->next = NULL;
1898                         info->offset = cfg->stack_offset;
1899                         cfg->stack_offset += sizeof (gpointer);
1900                 }
1901
1902                 if (i == spillvar)
1903                         return (*si)->offset;
1904
1905                 i++;
1906                 si = &(*si)->next;
1907         }
1908
1909         g_assert_not_reached ();
1910         return 0;
1911 }
1912
1913 /*========================= End of Function ========================*/
1914
1915 /*------------------------------------------------------------------*/
1916 /*                                                                  */
1917 /* Name         - mono_spillvar_offset_float                        */
1918 /*                                                                  */
1919 /* Function     -                                                   */
1920 /*                                                                  */
1921 /*------------------------------------------------------------------*/
1922
1923 static int
1924 mono_spillvar_offset_float (MonoCompile *cfg, int spillvar)
1925 {
1926         MonoSpillInfo **si, *info;
1927         int i = 0;
1928
1929         si = &cfg->spill_info_float;
1930
1931         while (i <= spillvar) {
1932
1933                 if (!*si) {
1934                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1935                         info->next         = NULL;
1936                         cfg->stack_offset  = S390_ALIGN(cfg->stack_offset, S390_STACK_ALIGNMENT);
1937                         info->offset       = cfg->stack_offset;
1938                         cfg->stack_offset += sizeof (double);
1939                 }
1940
1941                 if (i == spillvar)
1942                         return (*si)->offset;
1943
1944                 i++;
1945                 si = &(*si)->next;
1946         }
1947
1948         g_assert_not_reached ();
1949         return 0;
1950 }
1951
1952 /*========================= End of Function ========================*/
1953
1954 /*------------------------------------------------------------------*/
1955 /*                                                                  */
1956 /* Name         - print_ins                                         */
1957 /*                                                                  */
1958 /* Function     - Decode and print the instruction for tracing.     */
1959 /*                                                                  */
1960 /*------------------------------------------------------------------*/
1961
1962 static void
1963 print_ins (int i, MonoInst *ins)
1964 {
1965         const char *spec = ins_spec [ins->opcode];
1966         g_print ("\t%-2d %s", i, mono_inst_name (ins->opcode));
1967         if (spec [MONO_INST_DEST]) {
1968                 if (ins->dreg >= MONO_MAX_IREGS)
1969                         g_print (" R%d <-", ins->dreg);
1970                 else
1971                         g_print (" %s <-", mono_arch_regname (ins->dreg));
1972         }
1973         if (spec [MONO_INST_SRC1]) {
1974                 if (ins->sreg1 >= MONO_MAX_IREGS)
1975                         g_print (" R%d", ins->sreg1);
1976                 else
1977                         g_print (" %s", mono_arch_regname (ins->sreg1));
1978         }
1979         if (spec [MONO_INST_SRC2]) {
1980                 if (ins->sreg2 >= MONO_MAX_IREGS)
1981                         g_print (" R%d", ins->sreg2);
1982                 else
1983                         g_print (" %s", mono_arch_regname (ins->sreg2));
1984         }
1985         if (spec [MONO_INST_CLOB])
1986                 g_print (" clobbers: %c", spec [MONO_INST_CLOB]);
1987         g_print ("\n");
1988 }
1989
1990 /*========================= End of Function ========================*/
1991
1992 /*------------------------------------------------------------------*/
1993 /*                                                                  */
1994 /* Name         - print_regtrack.                                   */
1995 /*                                                                  */
1996 /* Function     -                                                   */
1997 /*                                                                  */
1998 /*------------------------------------------------------------------*/
1999
2000 static void
2001 print_regtrack (RegTrack *t, int num)
2002 {
2003         int i;
2004         char buf [32];
2005         const char *r;
2006
2007         for (i = 0; i < num; ++i) {
2008                 if (!t [i].born_in)
2009                         continue;
2010                 if (i >= MONO_MAX_IREGS) {
2011                         g_snprintf (buf, sizeof(buf), "R%d", i);
2012                         r = buf;
2013                 } else
2014                         r = mono_arch_regname (i);
2015                 g_print ("liveness: %s [%d - %d]\n", r, t [i].born_in, t[i].last_use);
2016         }
2017 }
2018
2019 /*========================= End of Function ========================*/
2020
2021 /*------------------------------------------------------------------*/
2022 /*                                                                  */
2023 /* Name         - inst_list_prepend                                 */
2024 /*                                                                  */
2025 /* Function     - Prepend an instruction to the list.               */
2026 /*                                                                  */
2027 /*------------------------------------------------------------------*/
2028
2029 static inline InstList*
2030 inst_list_prepend (MonoMemPool *pool, InstList *list, MonoInst *data)
2031 {
2032         InstList *item = mono_mempool_alloc (pool, sizeof (InstList));
2033         item->data = data;
2034         item->prev = NULL;
2035         item->next = list;
2036         if (list)
2037                 list->prev = item;
2038         return item;
2039 }
2040
2041 /*========================= End of Function ========================*/
2042
2043 /*------------------------------------------------------------------*/
2044 /*                                                                  */
2045 /* Name         - get_register_force_spilling                       */
2046 /*                                                                  */
2047 /* Function     - Force the spilling of the variable in the         */
2048 /*                symbolic register 'reg'.                          */
2049 /*                                                                  */
2050 /*------------------------------------------------------------------*/
2051
2052 static int
2053 get_register_force_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, int reg)
2054 {
2055         MonoInst *load;
2056         int i, sel, spill;
2057
2058         sel = cfg->rs->iassign [reg];
2059         i = reg;
2060         spill = ++cfg->spill_count;
2061         cfg->rs->iassign [i] = -spill - 1;
2062         mono_regstate_free_int (cfg->rs, sel);
2063         /*----------------------------------------------------------*/
2064         /* we need to create a spill var and insert a load to sel   */
2065         /* after the current instruction                            */
2066         /*----------------------------------------------------------*/
2067         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2068         load->dreg = sel;
2069         load->inst_basereg = cfg->frame_reg;
2070         load->inst_offset = mono_spillvar_offset (cfg, spill);
2071         if (item->prev) {
2072                 while (ins->next != item->prev->data)
2073                         ins = ins->next;
2074         }
2075         load->next = ins->next;
2076         ins->next  = load;
2077         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n",
2078                         spill, load->inst_offset, i, mono_arch_regname (sel)));
2079         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2080         g_assert (i == sel);
2081
2082         return sel;
2083 }
2084
2085 /*========================= End of Function ========================*/
2086
2087 /*------------------------------------------------------------------*/
2088 /*                                                                  */
2089 /* Name         -  get_register_spilling                            */
2090 /*                                                                  */
2091 /* Function     -                                                   */
2092 /*                                                                  */
2093 /*------------------------------------------------------------------*/
2094
2095 static int
2096 get_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2097 {
2098         MonoInst *load;
2099         int i, sel, spill;
2100
2101         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));
2102         /* exclude the registers in the current instruction */
2103         if (reg != ins->sreg1 &&
2104             (reg_is_freeable (ins->sreg1) ||
2105              (ins->sreg1 >= MONO_MAX_IREGS &&
2106               cfg->rs->iassign [ins->sreg1] >= 0))) {
2107                 if (ins->sreg1 >= MONO_MAX_IREGS)
2108                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg1]);
2109                 else
2110                         regmask &= ~ (1 << ins->sreg1);
2111                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2112         }
2113         if (reg != ins->sreg2 &&
2114             (reg_is_freeable (ins->sreg2) ||
2115              (ins->sreg2 >= MONO_MAX_IREGS &&
2116               cfg->rs->iassign [ins->sreg2] >= 0))) {
2117                 if (ins->sreg2 >= MONO_MAX_IREGS)
2118                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg2]);
2119                 else
2120                         regmask &= ~ (1 << ins->sreg2);
2121                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2122         }
2123         if (reg != ins->dreg && reg_is_freeable (ins->dreg)) {
2124                 regmask &= ~ (1 << ins->dreg);
2125                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2126         }
2127
2128         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2129         g_assert (regmask); /* need at least a register we can free */
2130         sel = -1;
2131         /* we should track prev_use and spill the register that's farther */
2132         for (i = 0; i < MONO_MAX_IREGS; ++i) {
2133                 if (regmask & (1 << i)) {
2134                         sel = i;
2135                         DEBUG (g_print ("selected register %s has assignment %d\n", mono_arch_regname (sel), cfg->rs->iassign [sel]));
2136                         break;
2137                 }
2138         }
2139         i = cfg->rs->isymbolic [sel];
2140         spill = ++cfg->spill_count;
2141         cfg->rs->iassign [i] = -spill - 1;
2142         mono_regstate_free_int (cfg->rs, sel);
2143         /* we need to create a spill var and insert a load to sel after the current instruction */
2144         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2145         load->dreg = sel;
2146         load->inst_basereg = cfg->frame_reg;
2147         load->inst_offset = mono_spillvar_offset (cfg, spill);
2148         if (item->prev) {
2149                 while (ins->next != item->prev->data)
2150                         ins = ins->next;
2151         }
2152         load->next = ins->next;
2153         ins->next = load;
2154         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2155         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2156         g_assert (i == sel);
2157
2158         return sel;
2159 }
2160
2161 /*========================= End of Function ========================*/
2162
2163 /*------------------------------------------------------------------*/
2164 /*                                                                  */
2165 /* Name         - get_float_register_spilling                       */
2166 /*                                                                  */
2167 /* Function     -                                                   */
2168 /*                                                                  */
2169 /*------------------------------------------------------------------*/
2170
2171 static int
2172 get_float_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2173 {
2174         MonoInst *load;
2175         int i, sel, spill;
2176
2177         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));
2178         /* exclude the registers in the current instruction */
2179         if (reg != ins->sreg1 &&
2180             (freg_is_freeable (ins->sreg1) ||
2181              (ins->sreg1 >= MONO_MAX_FREGS &&
2182               cfg->rs->fassign [ins->sreg1] >= 0))) {
2183                 if (ins->sreg1 >= MONO_MAX_FREGS)
2184                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg1]);
2185                 else
2186                         regmask &= ~ (1 << ins->sreg1);
2187                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2188         }
2189         if (reg != ins->sreg2 &&
2190             (freg_is_freeable (ins->sreg2) ||
2191              (ins->sreg2 >= MONO_MAX_FREGS &&
2192               cfg->rs->fassign [ins->sreg2] >= 0))) {
2193                 if (ins->sreg2 >= MONO_MAX_FREGS)
2194                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg2]);
2195                 else
2196                         regmask &= ~ (1 << ins->sreg2);
2197                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2198         }
2199         if (reg != ins->dreg && freg_is_freeable (ins->dreg)) {
2200                 regmask &= ~ (1 << ins->dreg);
2201                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2202         }
2203
2204         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2205         g_assert (regmask); /* need at least a register we can free */
2206         sel = -1;
2207         /* we should track prev_use and spill the register that's farther */
2208         for (i = 0; i < MONO_MAX_FREGS; ++i) {
2209                 if (regmask & (1 << i)) {
2210                         sel = i;
2211                         DEBUG (g_print ("selected register %s has assignment %d\n",
2212                                         mono_arch_regname (sel), cfg->rs->fassign [sel]));
2213                         break;
2214                 }
2215         }
2216         i = cfg->rs->fsymbolic [sel];
2217         spill = ++cfg->spill_count;
2218         cfg->rs->fassign [i] = -spill - 1;
2219         mono_regstate_free_float(cfg->rs, sel);
2220         /* we need to create a spill var and insert a load to sel after the current instruction */
2221         MONO_INST_NEW (cfg, load, OP_LOADR8_MEMBASE);
2222         load->dreg = sel;
2223         load->inst_basereg = cfg->frame_reg;
2224         load->inst_offset = mono_spillvar_offset_float (cfg, spill);
2225         if (item->prev) {
2226                 while (ins->next != item->prev->data)
2227                         ins = ins->next;
2228         }
2229         load->next = ins->next;
2230         ins->next = load;
2231         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2232         i = mono_regstate_alloc_float (cfg->rs, 1 << sel);
2233         g_assert (i == sel);
2234
2235         return sel;
2236 }
2237
2238 /*========================= End of Function ========================*/
2239
2240 /*------------------------------------------------------------------*/
2241 /*                                                                  */
2242 /* Name         - create_copy_ins                                   */
2243 /*                                                                  */
2244 /* Function     - Create an instruction to copy from reg to reg.    */
2245 /*                                                                  */
2246 /*------------------------------------------------------------------*/
2247
2248 static MonoInst*
2249 create_copy_ins (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2250 {
2251         MonoInst *copy;
2252         MONO_INST_NEW (cfg, copy, OP_MOVE);
2253         copy->dreg = dest;
2254         copy->sreg1 = src;
2255         if (ins) {
2256                 copy->next = ins->next;
2257                 ins->next = copy;
2258         }
2259         DEBUG (g_print ("\tforced copy from %s to %s\n",
2260                         mono_arch_regname (src), mono_arch_regname (dest)));
2261         return copy;
2262 }
2263
2264 /*========================= End of Function ========================*/
2265
2266 /*------------------------------------------------------------------*/
2267 /*                                                                  */
2268 /* Name         - create_copy_ins_float                             */
2269 /*                                                                  */
2270 /* Function     - Create an instruction to copy from float reg to   */
2271 /*                float reg.                                        */
2272 /*                                                                  */
2273 /*------------------------------------------------------------------*/
2274
2275 static MonoInst*
2276 create_copy_ins_float (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2277 {
2278         MonoInst *copy;
2279         MONO_INST_NEW (cfg, copy, OP_FMOVE);
2280         copy->dreg = dest;
2281         copy->sreg1 = src;
2282         if (ins) {
2283                 copy->next = ins->next;
2284                 ins->next = copy;
2285         }
2286         DEBUG (g_print ("\tforced copy from %s to %s\n",
2287                         mono_arch_regname (src), mono_arch_regname (dest)));
2288         return copy;
2289 }
2290
2291 /*========================= End of Function ========================*/
2292
2293 /*------------------------------------------------------------------*/
2294 /*                                                                  */
2295 /* Name         - create_spilled_store                              */
2296 /*                                                                  */
2297 /* Function     - Spill register to storage.                        */
2298 /*                                                                  */
2299 /*------------------------------------------------------------------*/
2300
2301 static MonoInst*
2302 create_spilled_store (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2303 {
2304         MonoInst *store;
2305         MONO_INST_NEW (cfg, store, OP_STORE_MEMBASE_REG);
2306         store->sreg1 = reg;
2307         store->inst_destbasereg = cfg->frame_reg;
2308         store->inst_offset = mono_spillvar_offset (cfg, spill);
2309         if (ins) {
2310                 store->next = ins->next;
2311                 ins->next = store;
2312         }
2313         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2314                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2315         return store;
2316 }
2317
2318 /*========================= End of Function ========================*/
2319
2320 /*------------------------------------------------------------------*/
2321 /*                                                                  */
2322 /* Name         - create_spilled_store_float                        */
2323 /*                                                                  */
2324 /* Function     - Spill floating point register to storage.         */
2325 /*                                                                  */
2326 /*------------------------------------------------------------------*/
2327
2328 static MonoInst*
2329 create_spilled_store_float (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2330 {
2331         MonoInst *store;
2332         MONO_INST_NEW (cfg, store, OP_STORER8_MEMBASE_REG);
2333         store->sreg1 = reg;
2334         store->inst_destbasereg = cfg->frame_reg;
2335         store->inst_offset = mono_spillvar_offset_float (cfg, spill);
2336         if (ins) {
2337                 store->next = ins->next;
2338                 ins->next = store;
2339         }
2340         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2341                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2342         return store;
2343 }
2344
2345 /*========================= End of Function ========================*/
2346
2347 /*------------------------------------------------------------------*/
2348 /*                                                                  */
2349 /* Name         - insert_before_ins                                 */
2350 /*                                                                  */
2351 /* Function     - Insert an instruction before another.             */
2352 /*                                                                  */
2353 /*------------------------------------------------------------------*/
2354
2355 static void
2356 insert_before_ins (MonoInst *ins, InstList *item, MonoInst* to_insert)
2357 {
2358         MonoInst *prev;
2359         g_assert (item->next);
2360         prev = item->next->data;
2361
2362         while (prev->next != ins)
2363                 prev = prev->next;
2364         to_insert->next = ins;
2365         prev->next = to_insert;
2366         /*
2367          * needed otherwise in the next instruction we can add an ins to the
2368          * end and that would get past this instruction.
2369          */
2370         item->data = to_insert;
2371 }
2372
2373 /*========================= End of Function ========================*/
2374
2375 /*------------------------------------------------------------------*/
2376 /*                                                                  */
2377 /* Name         - alloc_int_reg                                     */
2378 /*                                                                  */
2379 /* Function     - Allocate a general register.                      */
2380 /*                                                                  */
2381 /*------------------------------------------------------------------*/
2382
2383 static int
2384 alloc_int_reg (MonoCompile *cfg, InstList *curinst, MonoInst *ins, int sym_reg, guint32 allow_mask)
2385 {
2386         int val = cfg->rs->iassign [sym_reg];
2387         if (val < 0) {
2388                 int spill = 0;
2389                 if (val < -1) {
2390                         /* the register gets spilled after this inst */
2391                         spill = -val -1;
2392                 }
2393                 val = mono_regstate_alloc_int (cfg->rs, allow_mask);
2394                 if (val < 0)
2395                         val = get_register_spilling (cfg, curinst, ins, allow_mask, sym_reg);
2396                 cfg->rs->iassign [sym_reg] = val;
2397                 /* add option to store before the instruction for src registers */
2398                 if (spill)
2399                         create_spilled_store (cfg, spill, val, sym_reg, ins);
2400         }
2401         cfg->rs->isymbolic [val] = sym_reg;
2402         return val;
2403 }
2404
2405 /*========================= End of Function ========================*/
2406
2407 /*------------------------------------------------------------------*/
2408 /*                                                                  */
2409 /* Name         - mono_arch_local_regalloc.                         */
2410 /*                                                                  */
2411 /* Function     - We first scan the list of instructions and we     */
2412 /*                save the liveness information of each register    */
2413 /*                (when the register is first used, when its value  */
2414 /*                is set etc.). We also reverse the list of instr-  */
2415 /*                uctions (in the InstList list) because assigning  */
2416 /*                registers backwards allows for more tricks to be  */
2417 /*                used.                                             */
2418 /*                                                                  */
2419 /*------------------------------------------------------------------*/
2420
2421 void
2422 mono_arch_local_regalloc (MonoCompile *cfg, MonoBasicBlock *bb)
2423 {
2424         MonoInst *ins;
2425         MonoRegState *rs = cfg->rs;
2426         int i, val;
2427         RegTrack *reginfo, *reginfof;
2428         RegTrack *reginfo1, *reginfo2, *reginfod;
2429         InstList *tmp, *reversed = NULL;
2430         const char *spec;
2431         guint32 src1_mask, src2_mask, dest_mask;
2432         guint32 cur_iregs, cur_fregs;
2433
2434         if (!bb->code)
2435                 return;
2436         rs->next_vireg = bb->max_ireg;
2437         rs->next_vfreg = bb->max_freg;
2438         mono_regstate_assign (rs);
2439         reginfo = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vireg);
2440         reginfof = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vfreg);
2441         rs->ifree_mask = S390_CALLER_REGS;
2442         rs->ffree_mask = S390_CALLER_FREGS;
2443
2444         ins = bb->code;
2445         i = 1;
2446         DEBUG (g_print ("LOCAL regalloc: basic block: %d\n", bb->block_num));
2447         /* forward pass on the instructions to collect register liveness info */
2448         while (ins) {
2449                 spec = ins_spec [ins->opcode];
2450                 DEBUG (print_ins (i, ins));
2451                 if (spec [MONO_INST_CLOB] == 'c') {
2452                         MonoCallInst * call = (MonoCallInst*)ins;
2453                         int j;
2454                 }
2455                 if (spec [MONO_INST_SRC1]) {
2456                         if (spec [MONO_INST_SRC1] == 'f')
2457                                 reginfo1 = reginfof;
2458                         else
2459                                 reginfo1 = reginfo;
2460                         reginfo1 [ins->sreg1].prev_use = reginfo1 [ins->sreg1].last_use;
2461                         reginfo1 [ins->sreg1].last_use = i;
2462                 } else {
2463                         ins->sreg1 = -1;
2464                 }
2465                 if (spec [MONO_INST_SRC2]) {
2466                         if (spec [MONO_INST_SRC2] == 'f')
2467                                 reginfo2 = reginfof;
2468                         else
2469                                 reginfo2 = reginfo;
2470                         reginfo2 [ins->sreg2].prev_use = reginfo2 [ins->sreg2].last_use;
2471                         reginfo2 [ins->sreg2].last_use = i;
2472                 } else {
2473                         ins->sreg2 = -1;
2474                 }
2475                 if (spec [MONO_INST_DEST]) {
2476                         if (spec [MONO_INST_DEST] == 'f')
2477                                 reginfod = reginfof;
2478                         else
2479                                 reginfod = reginfo;
2480                         if (spec [MONO_INST_DEST] != 'b') /* it's not just a base register */
2481                                 reginfod [ins->dreg].killed_in = i;
2482                         reginfod [ins->dreg].prev_use = reginfod [ins->dreg].last_use;
2483                         reginfod [ins->dreg].last_use = i;
2484                         if (reginfod [ins->dreg].born_in == 0 || reginfod [ins->dreg].born_in > i)
2485                                 reginfod [ins->dreg].born_in = i;
2486                         if (spec [MONO_INST_DEST] == 'l') {
2487                                 /* result in eax:edx, the virtual register is allocated sequentially */
2488                                 reginfod [ins->dreg + 1].prev_use = reginfod [ins->dreg + 1].last_use;
2489                                 reginfod [ins->dreg + 1].last_use = i;
2490                                 if (reginfod [ins->dreg + 1].born_in == 0 || reginfod [ins->dreg + 1].born_in > i)
2491                                         reginfod [ins->dreg + 1].born_in = i;
2492                         }
2493                 } else {
2494                         ins->dreg = -1;
2495                 }
2496                 reversed = inst_list_prepend (cfg->mempool, reversed, ins);
2497                 ++i;
2498                 ins = ins->next;
2499         }
2500
2501         cur_iregs = S390_CALLER_REGS;
2502         cur_fregs = S390_CALLER_FREGS;
2503
2504         DEBUG (print_regtrack (reginfo, rs->next_vireg));
2505         DEBUG (print_regtrack (reginfof, rs->next_vfreg));
2506         tmp = reversed;
2507         while (tmp) {
2508                 int prev_dreg, prev_sreg1, prev_sreg2;
2509                 --i;
2510                 ins = tmp->data;
2511                 spec = ins_spec [ins->opcode];
2512                 DEBUG (g_print ("processing:"));
2513                 DEBUG (print_ins (i, ins));
2514                 /* make the register available for allocation: FIXME add fp reg */
2515                 if (ins->opcode == OP_SETREG || ins->opcode == OP_SETREGIMM) {
2516                         cur_iregs |= 1 << ins->dreg;
2517                         DEBUG (g_print ("adding %d to cur_iregs\n", ins->dreg));
2518                 } else if (ins->opcode == OP_SETFREG) {
2519                         cur_fregs |= 1 << ins->dreg;
2520                         DEBUG (g_print ("adding %d to cur_fregs\n", ins->dreg));
2521                 } else if (spec [MONO_INST_CLOB] == 'c') {
2522                         MonoCallInst *cinst = (MonoCallInst*)ins;
2523                         DEBUG (g_print ("excluding regs 0x%x from cur_iregs (0x%x)\n", cinst->used_iregs, cur_iregs));
2524                         DEBUG (g_print ("excluding fpregs 0x%x from cur_fregs (0x%x)\n", cinst->used_fregs, cur_fregs));
2525                         cur_iregs &= ~cinst->used_iregs;
2526                         cur_fregs &= ~cinst->used_fregs;
2527                         DEBUG (g_print ("available cur_iregs: 0x%x\n", cur_iregs));
2528                         DEBUG (g_print ("available cur_fregs: 0x%x\n", cur_fregs));
2529                         /* registers used by the calling convention are excluded from
2530                          * allocation: they will be selectively enabled when they are
2531                          * assigned by the special SETREG opcodes.
2532                          */
2533                 }
2534                 dest_mask = src1_mask = src2_mask = cur_iregs;
2535                 /* update for use with FP regs... */
2536                 if (spec [MONO_INST_DEST] == 'f') {
2537                         dest_mask = cur_fregs;
2538                         if (ins->dreg >= MONO_MAX_FREGS) {
2539                                 val = rs->fassign [ins->dreg];
2540                                 prev_dreg = ins->dreg;
2541                                 if (val < 0) {
2542                                         int spill = 0;
2543                                         if (val < -1) {
2544                                                 /* the register gets spilled after this inst */
2545                                                 spill = -val -1;
2546                                         }
2547                                         val = mono_regstate_alloc_float (rs, dest_mask);
2548                                         if (val < 0)
2549                                                 val = get_float_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2550                                         rs->fassign [ins->dreg] = val;
2551                                         if (spill)
2552                                                 create_spilled_store_float (cfg, spill, val, prev_dreg, ins);
2553                                 }
2554                                 DEBUG (g_print ("\tassigned dreg %s to dest R%d\n", mono_arch_regname (val), ins->dreg));
2555                                 rs->fsymbolic [val] = prev_dreg;
2556                                 ins->dreg = val;
2557                                 if (spec [MONO_INST_CLOB] == 'c' && ins->dreg != s390_f0) {
2558                                         /* this instruction only outputs to s390_f0, need to copy */
2559                                         create_copy_ins_float (cfg, ins->dreg, s390_f0, ins);
2560                                 }
2561                         } else {
2562                                 prev_dreg = -1;
2563                         }
2564                         if (freg_is_freeable (ins->dreg) && prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i || !(cur_fregs & (1 << ins->dreg)))) {
2565                                 DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2566                                 mono_regstate_free_float (rs, ins->dreg);
2567                         }
2568                 } else if (ins->dreg >= MONO_MAX_IREGS) {
2569                         val = rs->iassign [ins->dreg];
2570                         prev_dreg = ins->dreg;
2571                         if (val < 0) {
2572                                 int spill = 0;
2573                                 if (val < -1) {
2574                                         /* the register gets spilled after this inst */
2575                                         spill = -val -1;
2576                                 }
2577                                 val = mono_regstate_alloc_int (rs, dest_mask);
2578                                 if (val < 0)
2579                                         val = get_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2580                                 rs->iassign [ins->dreg] = val;
2581                                 if (spill)
2582                                         create_spilled_store (cfg, spill, val, prev_dreg, ins);
2583                         }
2584                         DEBUG (g_print ("\tassigned dreg %s to dest R%d\n", mono_arch_regname (val), ins->dreg));
2585                         rs->isymbolic [val] = prev_dreg;
2586                         ins->dreg = val;
2587                         if (spec [MONO_INST_DEST] == 'l') {
2588                                 int hreg = prev_dreg + 1;
2589                                 val = rs->iassign [hreg];
2590                                 if (val < 0) {
2591                                         int spill = 0;
2592                                         if (val < -1) {
2593                                                 /* the register gets spilled after this inst */
2594                                                 spill = -val -1;
2595                                         }
2596                                         val = mono_regstate_alloc_int (rs, dest_mask);
2597                                         if (val < 0)
2598                                                 val = get_register_spilling (cfg, tmp, ins, dest_mask, hreg);
2599                                         rs->iassign [hreg] = val;
2600                                         if (spill)
2601                                                 create_spilled_store (cfg, spill, val, hreg, ins);
2602                                 }
2603                                 DEBUG (g_print ("\tassigned hreg %s to dest R%d\n", mono_arch_regname (val), hreg));
2604                                 rs->isymbolic [val] = hreg;
2605                                 /* FIXME:? ins->dreg = val; */
2606                                 if (ins->dreg == s390_r3) {
2607                                         if (val != s390_r2)
2608                                                 create_copy_ins (cfg, val, s390_r2, ins);
2609                                 } else if (ins->dreg == s390_r2) {
2610                                         if (val == s390_r3) {
2611                                                 /* swap */
2612                                                 create_copy_ins (cfg, s390_r3, s390_r0, ins);
2613                                                 create_copy_ins (cfg, s390_r2, s390_r3, ins);
2614                                                 create_copy_ins (cfg, s390_r0, s390_r2, ins);
2615                                         } else {
2616                                                 /* two forced copies */
2617                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2618                                                 create_copy_ins (cfg, val, s390_r2, ins);
2619                                         }
2620                                 } else {
2621                                         if (val == s390_r2) {
2622                                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2623                                         } else {
2624                                                 /* two forced copies */
2625                                                 create_copy_ins (cfg, val, s390_r2, ins);
2626                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2627                                         }
2628                                 }
2629                                 if (reg_is_freeable (val) && hreg >= 0 && (reginfo [hreg].born_in >= i && !(cur_iregs & (1 << val)))) {
2630                                         DEBUG (g_print ("\tfreeable %s (R%d)\n", mono_arch_regname (val), hreg));
2631                                         mono_regstate_free_int (rs, val);
2632                                 }
2633                         } else if (spec [MONO_INST_DEST] == 'a' && ins->dreg != s390_r2 && spec [MONO_INST_CLOB] != 'd') {
2634                                 /* this instruction only outputs to s390_r2, need to copy */
2635                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2636                         }
2637                 } else {
2638                         prev_dreg = -1;
2639                 }
2640                 if (spec [MONO_INST_DEST] == 'f' &&
2641                     freg_is_freeable (ins->dreg) &&
2642                     prev_dreg >= 0 && (reginfof [prev_dreg].born_in >= i)) {
2643                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2644                         mono_regstate_free_float (rs, ins->dreg);
2645                 } else if (spec [MONO_INST_DEST] != 'f' &&
2646                            reg_is_freeable (ins->dreg) &&
2647                            prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i)) {
2648                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2649                          mono_regstate_free_int (rs, ins->dreg);
2650                 }
2651                 if (spec [MONO_INST_SRC1] == 'f') {
2652                         src1_mask = cur_fregs;
2653                         if (ins->sreg1 >= MONO_MAX_FREGS) {
2654                                 val = rs->fassign [ins->sreg1];
2655                                 prev_sreg1 = ins->sreg1;
2656                                 if (val < 0) {
2657                                         int spill = 0;
2658                                         if (val < -1) {
2659                                                 /* the register gets spilled after this inst */
2660                                                 spill = -val -1;
2661                                         }
2662                                         //g_assert (val == -1); /* source cannot be spilled */
2663                                         val = mono_regstate_alloc_float (rs, src1_mask);
2664                                         if (val < 0)
2665                                                 val = get_float_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2666                                         rs->fassign [ins->sreg1] = val;
2667                                         DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2668                                         if (spill) {
2669                                                 MonoInst *store = create_spilled_store_float (cfg, spill, val, prev_sreg1, NULL);
2670                                                 insert_before_ins (ins, tmp, store);
2671                                         }
2672                                 }
2673                                 rs->fsymbolic [val] = prev_sreg1;
2674                                 ins->sreg1 = val;
2675                         } else {
2676                                 prev_sreg1 = -1;
2677                         }
2678                 } else if (ins->sreg1 >= MONO_MAX_IREGS) {
2679                         val = rs->iassign [ins->sreg1];
2680                         prev_sreg1 = ins->sreg1;
2681                         if (val < 0) {
2682                                 int spill = 0;
2683                                 if (val < -1) {
2684                                         /* the register gets spilled after this inst */
2685                                         spill = -val -1;
2686 printf("val: %d spill: %d ins->sreg1: %d\n",val,spill,ins->sreg1);
2687                                 }
2688                                 val = mono_regstate_alloc_int (rs, src1_mask);
2689                                 if (val < 0)
2690                                         val = get_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2691                                 rs->iassign [ins->sreg1] = val;
2692                                 DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2693                                 if (spill) {
2694                                         MonoInst *store = create_spilled_store (cfg, spill, val, prev_sreg1, NULL);
2695                                         insert_before_ins (ins, tmp, store);
2696                                 }
2697                         }
2698                         rs->isymbolic [val] = prev_sreg1;
2699                         ins->sreg1 = val;
2700                 } else {
2701                         prev_sreg1 = -1;
2702                 }
2703                 /*----------------------------------------------*/
2704                 /* handle clobbering of sreg1                   */
2705                 /*----------------------------------------------*/
2706                 if ((spec [MONO_INST_CLOB] == '1' ||
2707                      spec [MONO_INST_CLOB] == 's') &&
2708                     ins->dreg != ins->sreg1) {
2709                         MonoInst *copy = create_copy_ins (cfg, ins->dreg, ins->sreg1, NULL);
2710                         DEBUG (g_print ("\tneed to copy sreg1 %s to dreg %s\n",
2711                                         mono_arch_regname (ins->sreg1),
2712                                         mono_arch_regname (ins->dreg)));
2713                         if (ins->sreg2 == -1 || spec [MONO_INST_CLOB] == 's') {
2714                                 /* note: the copy is inserted before the current instruction! */
2715                                 insert_before_ins (ins, tmp, copy);
2716                                 /* we set sreg1 to dest as well */
2717                                 prev_sreg1 = ins->sreg1 = ins->dreg;
2718                         } else {
2719                                 /* inserted after the operation */
2720                                 copy->next = ins->next;
2721                                 ins->next  = copy;
2722                         }
2723                 }
2724
2725                 if (spec [MONO_INST_SRC2] == 'f') {
2726                         src2_mask = cur_fregs;
2727                         if (ins->sreg2 >= MONO_MAX_FREGS) {
2728                                 val = rs->fassign [ins->sreg2];
2729                                 prev_sreg2 = ins->sreg2;
2730                                 if (val < 0) {
2731                                         int spill = 0;
2732                                         if (val < -1) {
2733                                                 /* the register gets spilled after this inst */
2734                                                 spill = -val -1;
2735                                         }
2736                                         val = mono_regstate_alloc_float (rs, src2_mask);
2737                                         if (val < 0)
2738                                                 val = get_float_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2739                                         rs->fassign [ins->sreg2] = val;
2740                                         DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2741                                         if (spill)
2742                                                 create_spilled_store_float (cfg, spill, val, prev_sreg2, ins);
2743                                 }
2744                                 rs->fsymbolic [val] = prev_sreg2;
2745                                 ins->sreg2 = val;
2746                         } else {
2747                                 prev_sreg2 = -1;
2748                         }
2749                 } else if (ins->sreg2 >= MONO_MAX_IREGS) {
2750                         val = rs->iassign [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_int (rs, src2_mask);
2759                                 if (val < 0)
2760                                         val = get_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2761                                 rs->iassign [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 (cfg, spill, val, prev_sreg2, ins);
2765                         }
2766                         rs->isymbolic [val] = prev_sreg2;
2767                         ins->sreg2 = val;
2768                 } else {
2769                         prev_sreg2 = -1;
2770                 }
2771
2772                 if (spec [MONO_INST_CLOB] == 'c') {
2773                         int j, s;
2774                         guint32 clob_mask = S390_CALLER_REGS;
2775                         for (j = 0; j < MONO_MAX_IREGS; ++j) {
2776                                 s = 1 << j;
2777                                 if ((clob_mask & s) && !(rs->ifree_mask & s) && j != ins->sreg1) {
2778                                         //g_warning ("register %s busy at call site\n", mono_arch_regname (j));
2779                                 }
2780                         }
2781                 }
2782                 /*if (reg_is_freeable (ins->sreg1) && prev_sreg1 >= 0 && reginfo [prev_sreg1].born_in >= i) {
2783                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg1)));
2784                         mono_regstate_free_int (rs, ins->sreg1);
2785                 }
2786                 if (reg_is_freeable (ins->sreg2) && prev_sreg2 >= 0 && reginfo [prev_sreg2].born_in >= i) {
2787                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg2)));
2788                         mono_regstate_free_int (rs, ins->sreg2);
2789                 }*/
2790
2791                 //DEBUG (print_ins (i, ins));
2792                 tmp = tmp->next;
2793         }
2794 }
2795
2796 /*========================= End of Function ========================*/
2797
2798 /*------------------------------------------------------------------*/
2799 /*                                                                  */
2800 /* Name         - emit_float_to_int                                 */
2801 /*                                                                  */
2802 /* Function     - Create instructions which will convert a floating */
2803 /*                point value to integer.                           */
2804 /*                                                                  */
2805 /*------------------------------------------------------------------*/
2806
2807 static guchar*
2808 emit_float_to_int (MonoCompile *cfg, guchar *code, int dreg, int sreg, int size, gboolean is_signed)
2809 {
2810         /* sreg is a float, dreg is an integer reg. */
2811         if (is_signed) {
2812                 s390_cfdbr (code, dreg, 5, sreg);
2813         } else {
2814                 s390_basr   (code, s390_r13, 0);
2815                 s390_j      (code, 10);
2816                 s390_double (code, 0x41e0000000000000);
2817                 s390_double (code, 0x41f0000000000000);
2818                 s390_ldr    (code, s390_f0, sreg);
2819                 s390_cdb    (code, s390_f0, 0, s390_r13, 0);
2820                 s390_jl     (code, 10);
2821                 s390_sdb    (code, s390_f0, 0, s390_r13, 8);
2822                 s390_cfdbr  (code, dreg, 7, s390_f0);
2823                 s390_j      (code, 5);
2824                 s390_cfdbr  (code, dreg, 5, sreg);
2825         }
2826         return code;
2827 }
2828
2829 /*========================= End of Function ========================*/
2830
2831 /*------------------------------------------------------------------*/
2832 /*                                                                  */
2833 /* Name         - mono_emit_stack_alloc                             */
2834 /*                                                                  */
2835 /* Function     -                                                   */
2836 /*                                                                  */
2837 /*------------------------------------------------------------------*/
2838
2839 static unsigned char*
2840 mono_emit_stack_alloc (guchar *code, MonoInst* tree)
2841 {
2842         return code;
2843 }
2844
2845 /*========================= End of Function ========================*/
2846
2847 /*------------------------------------------------------------------*/
2848 /*                                                                  */
2849 /* Name         - mono_arch_output_basic_block                      */
2850 /*                                                                  */
2851 /* Function     - Perform the "real" work of emitting instructions  */
2852 /*                that will do the work of in the basic block.      */
2853 /*                                                                  */
2854 /*------------------------------------------------------------------*/
2855
2856 void
2857 mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
2858 {
2859         MonoInst *ins;
2860         MonoCallInst *call;
2861         guint offset;
2862         guint8 *code = cfg->native_code + cfg->code_len;
2863         MonoInst *last_ins = NULL;
2864         guint last_offset = 0;
2865         int max_len, cpos;
2866
2867         if (cfg->opt & MONO_OPT_PEEPHOLE)
2868                 peephole_pass (cfg, bb);
2869
2870         /* we don't align basic blocks of loops on s390 */
2871
2872         if (cfg->verbose_level > 2)
2873                 g_print ("Basic block %d starting at offset 0x%x\n", bb->block_num, bb->native_offset);
2874
2875         cpos = bb->max_offset;
2876
2877         if (cfg->prof_options & MONO_PROFILE_COVERAGE) {
2878                 //MonoCoverageInfo *cov = mono_get_coverage_info (cfg->method);
2879                 //g_assert (!mono_compile_aot);
2880                 //cpos += 6;
2881                 //if (bb->cil_code)
2882                 //      cov->data [bb->dfn].iloffset = bb->cil_code - cfg->cil_code;
2883                 /* this is not thread save, but good enough */
2884                 /* fixme: howto handle overflows? */
2885                 //x86_inc_mem (code, &cov->data [bb->dfn].count);
2886         }
2887
2888         ins = bb->code;
2889         while (ins) {
2890                 offset = code - cfg->native_code;
2891
2892                 max_len = ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
2893
2894                 if (offset > (cfg->code_size - max_len - 16)) {
2895                         cfg->code_size *= 2;
2896                         cfg->native_code = g_realloc (cfg->native_code, cfg->code_size);
2897                         code = cfg->native_code + offset;
2898                 }
2899
2900                 switch (ins->opcode) {
2901                 case OP_STOREI1_MEMBASE_IMM:
2902                         s390_lhi (code, s390_r14, ins->inst_imm);
2903                         if (s390_is_uimm12(ins->inst_offset))
2904                                 s390_stc (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2905                         else {
2906                                 s390_basr (code, s390_r13, 0);
2907                                 s390_j    (code, 4);
2908                                 s390_word (code, ins->inst_offset);
2909                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2910                                 s390_stc  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2911                         }
2912                         break;
2913                 case OP_STOREI2_MEMBASE_IMM:
2914                         s390_lhi (code, s390_r14, ins->inst_imm);
2915                         if (s390_is_uimm12(ins->inst_offset)) {
2916                                 s390_sth (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2917                         } else {
2918                                 s390_basr (code, s390_r14, 0);
2919                                 s390_j    (code, 4);
2920                                 s390_word (code, ins->inst_offset);
2921                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2922                                 s390_sth  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2923                         }
2924                         break;
2925                 case OP_STORE_MEMBASE_IMM:
2926                 case OP_STOREI4_MEMBASE_IMM:
2927                         if (s390_is_imm16(ins->inst_imm)) {
2928                                 s390_lhi  (code, s390_r14, ins->inst_imm);
2929                         } else {
2930                                 s390_basr (code, s390_r13, 0);
2931                                 s390_j    (code, 4);
2932                                 s390_word (code, ins->inst_imm);
2933                                 s390_l    (code, s390_r14, 0, s390_r13, 4);
2934                         }
2935                         if (s390_is_uimm12(ins->inst_offset)) {
2936                                 s390_st  (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2937                         } else {
2938                                 s390_basr (code, s390_r13, 0);
2939                                 s390_j    (code, 4);
2940                                 s390_word (code, ins->inst_offset);
2941                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2942                                 s390_st   (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2943                         }
2944                         break;
2945                 case OP_STOREI1_MEMBASE_REG:
2946                         if (s390_is_uimm12(ins->inst_offset)) {
2947                                 s390_stc  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2948                         } else {
2949                                 s390_basr (code, s390_r13, 0);
2950                                 s390_j    (code, 4);
2951                                 s390_word (code, ins->inst_offset);
2952                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2953                                 s390_stc  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2954                         }
2955                         break;
2956                 case OP_STOREI2_MEMBASE_REG:
2957                         if (s390_is_uimm12(ins->inst_offset)) {
2958                                 s390_sth  (code, ins->sreg1, 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_sth  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2965                         }
2966                         break;
2967                 case OP_STORE_MEMBASE_REG:
2968                 case OP_STOREI4_MEMBASE_REG:
2969                         if (s390_is_uimm12(ins->inst_offset)) {
2970                                 s390_st   (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2971                         } else {
2972                                 s390_basr (code, s390_r13, 0);
2973                                 s390_j    (code, 4);
2974                                 s390_word (code, ins->inst_offset);
2975                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2976                                 s390_st   (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2977                         }
2978                         break;
2979                 case CEE_LDIND_I:
2980                 case CEE_LDIND_I4:
2981                 case CEE_LDIND_U4:
2982                         s390_basr (code, s390_r13, 0);
2983                         s390_j    (code, 4);
2984                         s390_word (code, ins->inst_p0);
2985                         s390_l    (code, s390_r13, 0, s390_r13, 4);
2986                         s390_l    (code, ins->dreg, 0, s390_r13, 0);
2987                         break;
2988                 case OP_LOADU4_MEM:
2989                         g_assert_not_reached ();
2990                         break;
2991                 case OP_LOAD_MEMBASE:
2992                 case OP_LOADI4_MEMBASE:
2993                 case OP_LOADU4_MEMBASE:
2994                         if (s390_is_uimm12(ins->inst_offset))
2995                                 s390_l    (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
2996                         else {
2997                                 s390_basr (code, s390_r13, 0);
2998                                 s390_j    (code, 4);
2999                                 s390_word (code, ins->inst_offset);
3000                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3001                                 s390_l    (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3002                         }
3003                         break;
3004                 case OP_LOADU1_MEMBASE:
3005                         s390_lhi (code, s390_r0, 0);
3006                         if (s390_is_uimm12(ins->inst_offset))
3007                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3008                         else {
3009                                 s390_basr (code, s390_r13, 0);
3010                                 s390_j    (code, 4);
3011                                 s390_word (code, ins->inst_offset);
3012                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3013                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3014                         }
3015                         s390_lr   (code, ins->dreg, s390_r0);
3016                         break;
3017                 case OP_LOADI1_MEMBASE:
3018                         s390_lhi (code, s390_r0, 0);
3019                         if (s390_is_uimm12(ins->inst_offset))
3020                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3021                         else {
3022                                 s390_basr (code, s390_r13, 0);
3023                                 s390_j    (code, 4);
3024                                 s390_word (code, ins->inst_offset);
3025                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3026                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3027                         }
3028                         s390_lhi  (code, s390_r13, 0x80);
3029                         s390_nr   (code, s390_r13, s390_r0);
3030                         s390_jz   (code, 5);
3031                         s390_lhi  (code, s390_r13, 0xff00);
3032                         s390_or   (code, s390_r0, s390_r13);
3033                         s390_lr   (code, ins->dreg, s390_r0);
3034                         break;
3035                 case OP_LOADU2_MEMBASE:
3036                         s390_lhi (code, s390_r0, 0);
3037                         if (s390_is_uimm12(ins->inst_offset))
3038                                 s390_icm  (code, s390_r0, 3, ins->inst_basereg, ins->inst_offset);
3039                         else {
3040                                 s390_basr (code, s390_r13, 0);
3041                                 s390_j    (code, 4);
3042                                 s390_word (code, ins->inst_offset);
3043                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3044                                 s390_ar   (code, s390_r13, ins->inst_basereg);
3045                                 s390_icm  (code, s390_r0, 3, s390_r13, 0);
3046                         }
3047                         s390_lr  (code, ins->dreg, s390_r0);
3048                         break;
3049                 case OP_LOADI2_MEMBASE:
3050                         s390_lhi (code, s390_r0, 0);
3051                         if (s390_is_uimm12(ins->inst_offset))
3052                                 s390_lh   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3053                         else {
3054                                 s390_basr (code, s390_r13, 0);
3055                                 s390_j    (code, 4);
3056                                 s390_word (code, ins->inst_offset);
3057                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3058                                 s390_lh   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3059                         }
3060                         s390_lr  (code, ins->dreg, s390_r0);
3061                         break;
3062                 case CEE_CONV_I1:
3063                         s390_lhi  (code, s390_r0, 0x80);
3064                         if (ins->dreg != ins->sreg1) {
3065                                 s390_lr   (code, ins->dreg, ins->sreg1);
3066                         }
3067                         s390_nr   (code, s390_r0, ins->sreg1);
3068                         s390_jl   (code, 9);
3069                         s390_lhi  (code, s390_r13, -1);
3070                         s390_sll  (code, s390_r13, 0, 8);
3071                         s390_or   (code, ins->dreg, s390_r13);
3072                         break;
3073                 case CEE_CONV_I2:
3074                         s390_lhi  (code, s390_r0, 0x80);
3075                         s390_lr   (code, ins->dreg, ins->sreg1);
3076                         s390_nr   (code, s390_r0, ins->sreg1);
3077                         s390_jl   (code, 9);
3078                         s390_lhi  (code, s390_r13, -1);
3079                         s390_sll  (code, s390_r13, 0, 16);
3080                         s390_or   (code, ins->dreg, s390_r13);
3081                         break;
3082                 case CEE_CONV_U1:
3083                         s390_lhi  (code, s390_r0, 0xff);
3084                         if (ins->dreg != ins->sreg1) {
3085                                 s390_lr   (code, ins->dreg, ins->sreg1);
3086                         }
3087                         s390_nr   (code, ins->dreg, s390_r0);
3088                         break;
3089                 case CEE_CONV_U2:
3090                         s390_lhi  (code, s390_r0, -1);
3091                         s390_sll  (code, s390_r0, 0, 16);
3092                         s390_srl  (code, s390_r0, 0, 16);
3093                         if (ins->dreg != ins->sreg1) {
3094                                 s390_lr   (code, ins->dreg, ins->sreg1);
3095                         }
3096                         s390_nr   (code, ins->dreg, s390_r0);
3097                         break;
3098                 case OP_COMPARE:
3099                         if ((ins->next) &&
3100                             ((ins->next->opcode >= CEE_BNE_UN) &&
3101                              (ins->next->opcode <= CEE_BLT_UN)))
3102                                 s390_clr  (code, ins->sreg1, ins->sreg2);
3103                         else
3104                                 s390_cr   (code, ins->sreg1, ins->sreg2);
3105                         break;
3106                 case OP_COMPARE_IMM:
3107                         if (s390_is_imm16 (ins->inst_imm)) {
3108                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3109                                 if ((ins->next) &&
3110                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3111                                     (ins->next->opcode <= CEE_BLT_UN)))
3112                                         s390_clr  (code, ins->sreg1, s390_r0);
3113                                 else
3114                                         s390_cr   (code, ins->sreg1, s390_r0);
3115                         }
3116                         else {
3117                                 s390_basr (code, s390_r13, 0);
3118                                 s390_j    (code, 4);
3119                                 s390_word (code, ins->inst_imm);
3120                                 if ((ins->next) &&
3121                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3122                                     (ins->next->opcode <= CEE_BLT_UN)))
3123                                         s390_cl   (code, ins->sreg1, 0, s390_r13, 4);
3124                                 else
3125                                         s390_c    (code, ins->sreg1, 0, s390_r13, 4);
3126                         }
3127                         break;
3128                 case OP_X86_TEST_NULL:
3129                         s390_ltr (code, ins->sreg1, ins->sreg1);
3130                         break;
3131                 case CEE_BREAK:
3132                         s390_break (code);
3133                         break;
3134                 case OP_ADDCC:
3135                         if (ins->dreg != ins->sreg1) {
3136                                 s390_lr   (code, ins->dreg, ins->sreg1);
3137                         }
3138                         s390_alr  (code, ins->dreg, ins->sreg2);
3139                         break;
3140                 case CEE_ADD:
3141                         if (ins->dreg != ins->sreg1) {
3142                                 s390_lr   (code, ins->dreg, ins->sreg1);
3143                         }
3144                         s390_ar   (code, ins->dreg, ins->sreg2);
3145                         break;
3146                 case OP_ADC:
3147                         if (ins->dreg != ins->sreg1) {
3148                                 s390_lr   (code, ins->dreg, ins->sreg1);
3149                         }
3150                         s390_alcr (code, ins->dreg, ins->sreg2);
3151                         break;
3152                 case OP_ADD_IMM:
3153                         if ((ins->next) &&
3154                             (ins->next->opcode == OP_ADC_IMM)) {
3155                                 s390_basr (code, s390_r13, 0);
3156                                 s390_j    (code, 4);
3157                                 s390_word (code, ins->inst_imm);
3158                                 if (ins->dreg != ins->sreg1) {
3159                                         s390_lr   (code, ins->dreg, ins->sreg1);
3160                                 }
3161                                 s390_al   (code, ins->dreg, 0, s390_r13, 4);
3162                         } else {
3163                                 if (s390_is_imm16 (ins->inst_imm)) {
3164                                         if (ins->dreg != ins->sreg1) {
3165                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3166                                         }
3167                                         s390_ahi (code, ins->dreg, ins->inst_imm);
3168                                 } else {
3169                                         s390_basr (code, s390_r13, 0);
3170                                         s390_j    (code, 4);
3171                                         s390_word (code, ins->inst_imm);
3172                                         if (ins->dreg != ins->sreg1) {
3173                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3174                                         }
3175                                         s390_a    (code, ins->dreg, 0, s390_r13, 4);
3176                                 }
3177                         }
3178                         break;
3179                 case OP_ADC_IMM:
3180                         if (s390_is_imm16 (ins->inst_imm)) {
3181                                 if (ins->dreg != ins->sreg1) {
3182                                         s390_lr   (code, ins->dreg, ins->sreg1);
3183                                 }
3184                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3185                                 s390_alcr (code, ins->dreg, s390_r0);
3186                         } else {
3187                                 s390_basr (code, s390_r13, 0);
3188                                 s390_j    (code, 4);
3189                                 s390_word (code, ins->inst_imm);
3190                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3191                                 s390_alcr (code, ins->dreg, s390_r13);
3192                         }
3193                         break;
3194                 case OP_SUBCC:
3195                         if (ins->dreg != ins->sreg1) {
3196                                 s390_lr   (code, ins->dreg, ins->sreg1);
3197                         }
3198                         s390_sr (code, ins->dreg, ins->sreg2);
3199                         break;
3200                 case CEE_SUB:
3201                         if (ins->dreg != ins->sreg1) {
3202                                 s390_lr   (code, ins->dreg, ins->sreg1);
3203                         }
3204                         s390_sr   (code, ins->dreg, ins->sreg2);
3205                         break;
3206                 case OP_SBB:
3207                         if (ins->dreg != ins->sreg1) {
3208                                 s390_lr   (code, ins->dreg, ins->sreg1);
3209                         }
3210                         s390_slbr (code, ins->dreg, ins->sreg2);
3211                         break;
3212                 case OP_SUB_IMM:
3213                         if (s390_is_imm16 (-ins->inst_imm)) {
3214                                 if (ins->dreg != ins->sreg1) {
3215                                         s390_lr   (code, ins->dreg, ins->sreg1);
3216                                 }
3217                                 s390_ahi  (code, ins->dreg, -ins->inst_imm);
3218                         } else {
3219                                 s390_basr (code, s390_r13, 0);
3220                                 s390_j    (code, 4);
3221                                 s390_word (code, ins->inst_imm);
3222                                 if (ins->dreg != ins->sreg1) {
3223                                         s390_lr   (code, ins->dreg, ins->sreg1);
3224                                 }
3225                                 s390_s    (code, ins->dreg, 0, s390_r13, 4);
3226                         }
3227                         break;
3228                 case OP_SBB_IMM:
3229                         s390_basr (code, s390_r13, 0);
3230                         s390_j    (code, 4);
3231                         s390_word (code, ins->inst_imm);
3232                         s390_sl   (code, ins->dreg, 0, s390_r13, 4);
3233                         break;
3234                 case CEE_AND:
3235                         if (ins->sreg1 == ins->dreg) {
3236                                 s390_nr   (code, ins->dreg, ins->sreg2);
3237                         }
3238                         else {
3239                                 if (ins->sreg2 == ins->dreg) {
3240                                         s390_nr  (code, ins->dreg, ins->sreg1);
3241                                 }
3242                                 else {
3243                                         s390_lr  (code, ins->dreg, ins->sreg1);
3244                                         s390_nr  (code, ins->dreg, ins->sreg2);
3245                                 }
3246                         }
3247                         break;
3248                 case OP_AND_IMM:
3249                         if (s390_is_imm16 (ins->inst_imm)) {
3250                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3251                                 if (ins->dreg != ins->sreg1) {
3252                                         s390_lr   (code, ins->dreg, ins->sreg1);
3253                                 }
3254                                 s390_nr   (code, ins->dreg, s390_r0);
3255                         } else {
3256                                 s390_basr (code, s390_r13, 0);
3257                                 s390_j    (code, 4);
3258                                 s390_word (code, ins->inst_imm);
3259                                 if (ins->dreg != ins->sreg1) {
3260                                         s390_lr   (code, ins->dreg, ins->sreg1);
3261                                 }
3262                                 s390_n    (code, ins->dreg, 0, s390_r13, 4);
3263                         }
3264                         break;
3265                 case CEE_DIV:
3266                         s390_lr   (code, s390_r0, ins->sreg1);
3267                         s390_srda (code, s390_r0, 0, 32);
3268                         s390_dr   (code, s390_r0, ins->sreg2);
3269                         s390_lr   (code, ins->dreg, s390_r1);
3270                         break;
3271                 case CEE_DIV_UN:
3272                         s390_lr   (code, s390_r0, ins->sreg1);
3273                         s390_srdl (code, s390_r0, 0, 32);
3274                         s390_dlr  (code, s390_r0, ins->sreg2);
3275                         s390_lr   (code, ins->dreg, s390_r1);
3276                         break;
3277                 case OP_DIV_IMM:
3278                         if (s390_is_imm16 (ins->inst_imm)) {
3279                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3280                                 s390_lr   (code, s390_r0, ins->sreg1);
3281                         } else {
3282                                 s390_basr (code, s390_r13, 0);
3283                                 s390_j    (code, 4);
3284                                 s390_word (code, ins->inst_imm);
3285                                 s390_lr   (code, s390_r0, ins->sreg1);
3286                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3287                         }
3288                         s390_srda (code, s390_r0, 0, 32);
3289                         s390_dr   (code, s390_r0, ins->sreg2);
3290                         s390_lr   (code, ins->dreg, s390_r1);
3291                         break;
3292                 case CEE_REM:
3293                         s390_lr   (code, s390_r0, ins->sreg1);
3294                         s390_srda (code, s390_r0, 0, 32);
3295                         s390_dr   (code, s390_r0, ins->sreg2);
3296                         s390_lr   (code, ins->dreg, s390_r0);
3297                         break;
3298                 case CEE_REM_UN:
3299                         s390_lr   (code, s390_r0, ins->sreg1);
3300                         s390_srdl (code, s390_r0, 0, 32);
3301                         s390_dlr  (code, s390_r0, ins->sreg2);
3302                         s390_lr   (code, ins->dreg, s390_r0);
3303                         break;
3304                 case OP_REM_IMM:
3305                         if (s390_is_imm16 (ins->inst_imm)) {
3306                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3307                                 s390_lr   (code, s390_r0, ins->sreg1);
3308                         } else {
3309                                 s390_basr (code, s390_r13, 0);
3310                                 s390_j    (code, 4);
3311                                 s390_word (code, ins->inst_imm);
3312                                 s390_lr   (code, s390_r0, ins->sreg1);
3313                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3314                         }
3315                         s390_srda (code, s390_r0, 0, 32);
3316                         s390_dr   (code, s390_r0, ins->sreg2);
3317                         s390_lr   (code, ins->dreg, s390_r0);
3318                         break;
3319                 case CEE_OR:
3320                         if (ins->sreg1 == ins->dreg) {
3321                                 s390_or   (code, ins->dreg, ins->sreg2);
3322                         }
3323                         else {
3324                                 if (ins->sreg2 == ins->dreg) {
3325                                         s390_or  (code, ins->dreg, ins->sreg1);
3326                                 }
3327                                 else {
3328                                         s390_lr  (code, ins->dreg, ins->sreg1);
3329                                         s390_or  (code, ins->dreg, ins->sreg2);
3330                                 }
3331                         }
3332                         break;
3333                 case OP_OR_IMM:
3334                         if (s390_is_imm16 (ins->inst_imm)) {
3335                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3336                                 if (ins->dreg != ins->sreg1) {
3337                                         s390_lr   (code, ins->dreg, ins->sreg1);
3338                                 }
3339                                 s390_or   (code, ins->dreg, s390_r0);
3340                         } else {
3341                                 s390_bras (code, s390_r13, 4);
3342                                 s390_word (code, ins->inst_imm);
3343                                 if (ins->dreg != ins->sreg1) {
3344                                         s390_lr   (code, ins->dreg, ins->sreg1);
3345                                 }
3346                                 s390_o    (code, ins->dreg, 0, s390_r13, 0);
3347                         }
3348                         break;
3349                 case CEE_XOR:
3350                         if (ins->sreg1 == ins->dreg) {
3351                                 s390_xr   (code, ins->dreg, ins->sreg2);
3352                         }
3353                         else {
3354                                 if (ins->sreg2 == ins->dreg) {
3355                                         s390_xr  (code, ins->dreg, ins->sreg1);
3356                                 }
3357                                 else {
3358                                         s390_lr  (code, ins->dreg, ins->sreg1);
3359                                         s390_xr  (code, ins->dreg, ins->sreg2);
3360                                 }
3361                         }
3362                         break;
3363                 case OP_XOR_IMM:
3364                         if (s390_is_imm16 (ins->inst_imm)) {
3365                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3366                                 if (ins->dreg != ins->sreg1) {
3367                                         s390_lr   (code, ins->dreg, ins->sreg1);
3368                                 }
3369                                 s390_xr   (code, ins->dreg, s390_r0);
3370                         } else {
3371                                 s390_basr (code, s390_r13, 0);
3372                                 s390_j    (code, 4);
3373                                 s390_word (code, ins->inst_imm);
3374                                 if (ins->dreg != ins->sreg1) {
3375                                         s390_lr   (code, ins->dreg, ins->sreg1);
3376                                 }
3377                                 s390_x    (code, ins->dreg, 0, s390_r13, 4);
3378                         }
3379                         break;
3380                 case CEE_SHL:
3381                         if (ins->sreg1 != ins->dreg) {
3382                                 s390_lr   (code, ins->dreg, ins->sreg1);
3383                         }
3384                         s390_sll  (code, ins->dreg, ins->sreg2, 0);
3385                         break;
3386                 case OP_SHL_IMM:
3387                         if (ins->sreg1 != ins->dreg) {
3388                                 s390_lr   (code, ins->dreg, ins->sreg1);
3389                         }
3390                         s390_sll  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3391                         break;
3392                 case CEE_SHR:
3393                         if (ins->sreg1 != ins->dreg) {
3394                                 s390_lr   (code, ins->dreg, ins->sreg1);
3395                         }
3396                         s390_sra  (code, ins->dreg, ins->sreg2, 0);
3397                         break;
3398                 case OP_SHR_IMM:
3399                         if (ins->sreg1 != ins->dreg) {
3400                                 s390_lr   (code, ins->dreg, ins->sreg1);
3401                         }
3402                         s390_sra  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3403                         break;
3404                 case OP_SHR_UN_IMM:
3405                         if (ins->sreg1 != ins->dreg) {
3406                                 s390_lr   (code, ins->dreg, ins->sreg1);
3407                         }
3408                         s390_srl  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3409                         break;
3410                 case CEE_SHR_UN:
3411                         if (ins->sreg1 != ins->dreg) {
3412                                 s390_lr   (code, ins->dreg, ins->sreg1);
3413                         }
3414                         s390_srl  (code, ins->dreg, ins->sreg2, 0);
3415                         break;
3416                 case CEE_NOT:
3417                         if (ins->sreg1 != ins->dreg) {
3418                                 s390_lr   (code, ins->dreg, ins->sreg1);
3419                         }
3420                         s390_lhi (code, s390_r0, -1);
3421                         s390_xr  (code, ins->dreg, s390_r0);
3422                         break;
3423                 case CEE_NEG:
3424                         s390_lcr (code, ins->dreg, ins->sreg1);
3425                         break;
3426                 case CEE_MUL:
3427                         if (ins->sreg1 == ins->dreg) {
3428                                 s390_msr  (code, ins->dreg, ins->sreg2);
3429                         }
3430                         else {
3431                                 if (ins->sreg2 == ins->dreg) {
3432                                         s390_msr (code, ins->dreg, ins->sreg1);
3433                                 }
3434                                 else {
3435                                         s390_lr  (code, ins->dreg, ins->sreg1);
3436                                         s390_msr (code, ins->dreg, ins->sreg2);
3437                                 }
3438                         }
3439                         break;
3440                 case OP_MUL_IMM:
3441                         if (s390_is_imm16 (ins->inst_imm)) {
3442                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3443                         } else {
3444                                 s390_basr (code, s390_r13, 0);
3445                                 s390_j    (code, 4);
3446                                 s390_word (code, ins->inst_imm);
3447                                 if (ins->dreg != ins->sreg1) {
3448                                         s390_lr   (code, ins->dreg, ins->sreg1);
3449                                 }
3450                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3451                         }
3452                         s390_msr  (code, ins->dreg, s390_r13);
3453                         break;
3454                 case CEE_MUL_OVF:
3455                         s390_lhi  (code, s390_r0, 0);
3456                         s390_lr   (code, s390_r1, ins->sreg1);
3457                         s390_mr   (code, s390_r0, ins->sreg2);
3458                         s390_ltr  (code, s390_r0, s390_r0);
3459                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3460                         s390_lr   (code, ins->dreg, s390_r1);
3461                         break;
3462                 case CEE_MUL_OVF_UN:
3463                         s390_lhi  (code, s390_r0, 0);
3464                         s390_lr   (code, s390_r1, ins->sreg1);
3465                         s390_mlr  (code, s390_r0, ins->sreg2);
3466                         s390_ltr  (code, s390_r0, s390_r0);
3467                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3468                         s390_lr   (code, ins->dreg, s390_r1);
3469                         break;
3470                 case OP_LMUL:
3471                         s390_l    (code, s390_r0, 0, ins->sreg1, 4);
3472                         s390_lr   (code, s390_r14, s390_r0);
3473                         s390_srda (code, s390_r0, 0, 32);
3474                         s390_m    (code, s390_r0, 0, ins->sreg2, 4);
3475                         s390_srl  (code, s390_r14, 0, 31);
3476                         s390_a    (code, s390_r14, 0, ins->sreg1, 0);
3477                         s390_l    (code, s390_r13, 0, ins->sreg2, 0);
3478                         s390_srl  (code, s390_r13, 0, 31);
3479                         s390_ms   (code, s390_r13, 0, ins->sreg1, 4);
3480                         s390_ar   (code, s390_r14, s390_r13);
3481                         s390_st   (code, s390_r14, 0, ins->dreg, 0);
3482                         s390_st   (code, s390_r1, 0, ins->dreg, 4);
3483                         break;
3484                 case OP_ICONST:
3485                 case OP_SETREGIMM:
3486                         if (s390_is_imm16(ins->inst_c0)) {
3487                                 s390_lhi  (code, ins->dreg, ins->inst_c0);
3488                         } else {
3489                                 s390_basr (code, s390_r13, 0);
3490                                 s390_j    (code, 4);
3491                                 s390_word (code, ins->inst_c0);
3492                                 s390_l    (code, ins->dreg, 0, s390_r13, 4);
3493                         }
3494                         break;
3495                 case OP_AOTCONST:
3496                         s390_basr (code, s390_r13, 0);
3497                         s390_j    (code, 4);
3498                         mono_add_patch_info (cfg, code - cfg->native_code,
3499                                 (MonoJumpInfoType)ins->inst_i1, ins->inst_p0);
3500                         s390_word (code, 0);
3501                         s390_l    (code,ins->dreg, 0, s390_r13, 4);
3502                         break;
3503                 case CEE_CONV_I4:
3504                 case CEE_CONV_U4:
3505                 case OP_MOVE:
3506                 case OP_SETREG:
3507                         if (ins->dreg != ins->sreg1) {
3508                                 s390_lr (code, ins->dreg, ins->sreg1);
3509                         }
3510                         break;
3511                 case OP_SETLRET: {
3512                         int saved = ins->sreg1;
3513                         if (ins->sreg1 == s390_r2) {
3514                                 s390_lr (code, s390_r0, ins->sreg1);
3515                                 saved = s390_r0;
3516                         }
3517                         if (ins->sreg2 != s390_r2)
3518                                 s390_lr (code, s390_r2, ins->sreg2);
3519                         if (saved != s390_r3)
3520                                 s390_lr (code, s390_r3, saved);
3521                         break;
3522                 }
3523                 case OP_SETFREG:
3524                 case OP_FMOVE:
3525                         if (ins->dreg != ins->sreg1) {
3526                                 s390_ldr   (code, ins->dreg, ins->sreg1);
3527                         }
3528                         break;
3529                 case OP_FCONV_TO_R4:
3530                         s390_ledbr (code, ins->dreg, ins->sreg1);
3531                         break;
3532                 case CEE_JMP:
3533                         g_assert_not_reached ();
3534                         break;
3535                 case OP_CHECK_THIS:
3536                         /* ensure ins->sreg1 is not NULL */
3537                         s390_icm (code, s390_r0, 15, ins->sreg1, 0);
3538                         break;
3539                 case OP_FCALL:
3540                 case OP_LCALL:
3541                 case OP_VCALL:
3542                 case OP_VOIDCALL:
3543                 case CEE_CALL:
3544                         call = (MonoCallInst*)ins;
3545                         if (ins->flags & MONO_INST_HAS_METHOD)
3546                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_METHOD, call->method);
3547                         else
3548                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_ABS, call->fptr);
3549                         s390_brasl (code, s390_r14, 0);
3550                         break;
3551                 case OP_FCALL_REG:
3552                 case OP_LCALL_REG:
3553                 case OP_VCALL_REG:
3554                 case OP_VOIDCALL_REG:
3555                 case OP_CALL_REG:
3556                         s390_lr   (code, s390_r1, ins->sreg1);
3557                         s390_basr (code, s390_r14, s390_r1);
3558                         break;
3559                 case OP_FCALL_MEMBASE:
3560                 case OP_LCALL_MEMBASE:
3561                 case OP_VCALL_MEMBASE:
3562                 case OP_VOIDCALL_MEMBASE:
3563                 case OP_CALL_MEMBASE:
3564                         s390_l    (code, s390_r1, 0, ins->sreg1, ins->inst_offset);
3565                         s390_basr (code, s390_r14, s390_r1);
3566                         break;
3567                 case OP_OUTARG:
3568                         g_assert_not_reached ();
3569                         break;
3570                 case OP_LOCALLOC:
3571                         s390_lr   (code, s390_r1, ins->sreg1);
3572                         s390_ahi  (code, s390_r1, 14);
3573                         s390_srl  (code, s390_r1, 0, 3);
3574                         s390_sll  (code, s390_r1, 0, 3);
3575                         s390_l    (code, s390_r13, 0, STK_BASE, 0);
3576                         s390_lcr  (code, s390_r1, s390_r1);
3577                         s390_la   (code, STK_BASE, STK_BASE, s390_r1, 0);
3578                         s390_st   (code, s390_r13, 0, STK_BASE, 0);
3579                         s390_la   (code, ins->dreg, 0, STK_BASE, S390_MINIMAL_STACK_SIZE+7);
3580                         s390_srl  (code, ins->dreg, 0, 3);
3581                         s390_sll  (code, ins->dreg, 0, 3);
3582                         break;
3583                 case CEE_RET:
3584                         s390_br  (code, s390_r14);
3585                         break;
3586                 case CEE_THROW: {
3587                         s390_lr (code, s390_r2, ins->sreg1);
3588                         mono_add_patch_info (cfg, code-cfg->native_code, MONO_PATCH_INFO_INTERNAL_METHOD,
3589                                              (gpointer)"mono_arch_throw_exception");
3590                         s390_brasl (code, s390_r14, 0);
3591                         break;
3592                 }
3593                 case OP_START_HANDLER:
3594                         s390_lr   (code, s390_r0, s390_r14);
3595                         s390_st   (code, s390_r0, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3596                         break;
3597                 case OP_ENDFILTER:
3598                         if (ins->sreg1 != s390_r2)
3599                                 s390_lr (code, s390_r2, ins->sreg1);
3600                         s390_l   (code, STK_BASE, 0, STK_BASE, 0);
3601                         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
3602                         s390_br  (code, s390_r14);
3603                         break;
3604                 case CEE_ENDFINALLY:
3605                         s390_l   (code, s390_r14, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3606                         s390_br  (code, s390_r14);
3607                         break;
3608                 case OP_CALL_HANDLER:
3609                         mono_add_patch_info (cfg, code-cfg->native_code,
3610                                              MONO_PATCH_INFO_BB, ins->inst_target_bb);
3611                         s390_brasl (code, s390_r14, 0);
3612                         break;
3613                 case OP_LABEL:
3614                         ins->inst_c0 = code - cfg->native_code;
3615                         break;
3616                 case CEE_BR:
3617                         EMIT_UNCOND_BRANCH(ins);
3618                         break;
3619                 case OP_BR_REG:
3620                         s390_br  (code, ins->sreg1);
3621                         break;
3622                 case OP_CEQ:
3623                         s390_lhi (code, ins->dreg, 1);
3624                         s390_jz  (code, 4);
3625                         s390_lhi (code, ins->dreg, 0);
3626                         break;
3627                 case OP_CLT:
3628                         s390_lhi (code, ins->dreg, 1);
3629                         s390_jl  (code, 4);
3630                         s390_lhi (code, ins->dreg, 0);
3631                         break;
3632                 case OP_CLT_UN:
3633                         s390_lhi (code, ins->dreg, 1);
3634                         s390_jlo (code, 4);
3635                         s390_lhi (code, ins->dreg, 0);
3636                         break;
3637                 case OP_CGT:
3638                         s390_lhi (code, ins->dreg, 1);
3639                         s390_jh  (code, 4);
3640                         s390_lhi (code, ins->dreg, 0);
3641                         break;
3642                 case OP_CGT_UN:
3643                         s390_lhi (code, ins->dreg, 1);
3644                         s390_jho (code, 4);
3645                         s390_lhi (code, ins->dreg, 0);
3646                         break;
3647                 case OP_COND_EXC_EQ:
3648                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_EQ, ins->inst_p1);
3649                         break;
3650                 case OP_COND_EXC_NE_UN:
3651                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NE, ins->inst_p1);
3652                         break;
3653                 case OP_COND_EXC_LT:
3654                 case OP_COND_EXC_LT_UN:
3655                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LT, ins->inst_p1);
3656                         break;
3657                 case OP_COND_EXC_GT:
3658                 case OP_COND_EXC_GT_UN:
3659                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GT, ins->inst_p1);
3660                         break;
3661                 case OP_COND_EXC_GE:
3662                 case OP_COND_EXC_GE_UN:
3663                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GE, ins->inst_p1);
3664                         break;
3665                 case OP_COND_EXC_LE:
3666                 case OP_COND_EXC_LE_UN:
3667                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LE, ins->inst_p1);
3668                         break;
3669                 case OP_COND_EXC_OV:
3670                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_OV, ins->inst_p1);
3671                         break;
3672                 case OP_COND_EXC_NO:
3673                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NO, ins->inst_p1);
3674                         break;
3675                 case OP_COND_EXC_C:
3676                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_CY, ins->inst_p1);
3677                         break;
3678                 case OP_COND_EXC_NC:
3679                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NC, ins->inst_p1);
3680                         break;
3681                 case CEE_BEQ:
3682                         EMIT_COND_BRANCH (ins, S390_CC_EQ);
3683                         break;
3684                 case CEE_BNE_UN:
3685                         EMIT_COND_BRANCH (ins, S390_CC_NE);
3686                         break;
3687                 case CEE_BLT:
3688                 case CEE_BLT_UN:
3689                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3690                         break;
3691                 case CEE_BGT:
3692                 case CEE_BGT_UN:
3693                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3694                         break;
3695                 case CEE_BGE:
3696                 case CEE_BGE_UN:
3697                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3698                         break;
3699                 case CEE_BLE:
3700                 case CEE_BLE_UN:
3701                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3702                         break;
3703
3704                 /* floating point opcodes */
3705                 case OP_R8CONST:
3706                         if (*((float *) ins->inst_p0) == 0) {
3707                                 s390_lzdr (code, ins->dreg);
3708                         } else {
3709                                 s390_basr  (code, s390_r13, 0);
3710                                 s390_j     (code, 4);
3711                                 s390_word  (code, ins->inst_p0);
3712                                 s390_l     (code, s390_r13, 0, s390_r13, 4);
3713                                 s390_ld    (code, ins->dreg, 0, s390_r13, 0);
3714                         }
3715                         break;
3716                 case OP_R4CONST:
3717                         if (*((float *) ins->inst_p0) == 0) {
3718                                 s390_lzer (code, ins->dreg);
3719                         } else {
3720                                 s390_basr (code, s390_r13, 0);
3721                                 s390_j    (code, 4);
3722                                 s390_word (code, ins->inst_p0);
3723                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3724                                 s390_le   (code, ins->dreg, 0, s390_r13, 0);
3725                                 s390_ldebr(code, ins->dreg, ins->dreg);
3726                         }
3727                         break;
3728                 case OP_STORER8_MEMBASE_REG:
3729                         if (s390_is_uimm12(ins->inst_offset)) {
3730                                 s390_std  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3731                         } else {
3732                                 s390_basr (code, s390_r13, 0);
3733                                 s390_j    (code, 4);
3734                                 s390_word (code, ins->inst_offset);
3735                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3736                                 s390_std  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3737                         }
3738                         break;
3739                 case OP_LOADR8_MEMBASE:
3740                         if (s390_is_uimm12(ins->inst_offset)) {
3741                                 s390_ld   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3742                         } else {
3743                                 s390_basr (code, s390_r13, 0);
3744                                 s390_j    (code, 4);
3745                                 s390_word (code, ins->inst_offset);
3746                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3747                                 s390_ld   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3748                         }
3749                         break;
3750                 case OP_STORER4_MEMBASE_REG:
3751                         if (s390_is_uimm12(ins->inst_offset)) {
3752                                 s390_ledbr(code, s390_f0, ins->sreg1);
3753                                 s390_ste  (code, s390_f0, 0, ins->inst_destbasereg, ins->inst_offset);
3754                         } else {
3755                                 s390_basr (code, s390_r13, 0);
3756                                 s390_j    (code, 4);
3757                                 s390_word (code, ins->inst_offset);
3758                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3759                                 s390_ledbr(code, s390_f0, ins->sreg1);
3760                                 s390_ste  (code, s390_f0, s390_r13, ins->inst_destbasereg, 0);
3761                         }
3762                         break;
3763                 case OP_LOADR4_MEMBASE:
3764                         if (s390_is_uimm12(ins->inst_offset)) {
3765                                 s390_le   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3766                         } else {
3767                                 s390_basr (code, s390_r13, 0);
3768                                 s390_j    (code, 4);
3769                                 s390_word (code, ins->inst_offset);
3770                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3771                                 s390_le   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3772                         }
3773                         s390_ldebr (code, ins->dreg, ins->dreg);
3774                         break;
3775                 case CEE_CONV_R_UN:
3776                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3777                         s390_ltr   (code, ins->sreg1, ins->sreg1);
3778                         s390_jnl   (code, 12);
3779                         s390_basr  (code, s390_r13, 0);
3780                         s390_j     (code, 6);
3781                         s390_word  (code, 0x41f00000);
3782                         s390_word  (code, 0);
3783                         s390_adb   (code, ins->dreg, 0, s390_r13, 4);
3784                         break;
3785                 case CEE_CONV_R4:
3786                         s390_cefbr (code, ins->dreg, ins->sreg1);
3787                         break;
3788                 case CEE_CONV_R8:
3789                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3790                         break;
3791                 case OP_FCONV_TO_I1:
3792                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, TRUE);
3793                         break;
3794                 case OP_FCONV_TO_U1:
3795                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, FALSE);
3796                         break;
3797                 case OP_FCONV_TO_I2:
3798                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, TRUE);
3799                         break;
3800                 case OP_FCONV_TO_U2:
3801                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, FALSE);
3802                         break;
3803                 case OP_FCONV_TO_I4:
3804                 case OP_FCONV_TO_I:
3805                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, TRUE);
3806                         break;
3807                 case OP_FCONV_TO_U4:
3808                 case OP_FCONV_TO_U:
3809                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, FALSE);
3810                         break;
3811                 case OP_FCONV_TO_I8:
3812                 case OP_FCONV_TO_U8:
3813                         g_assert_not_reached ();
3814                         /* Implemented as helper calls */
3815                         break;
3816                 case OP_LCONV_TO_R_UN:
3817                         g_assert_not_reached ();
3818                         /* Implemented as helper calls */
3819                         break;
3820                 case OP_LCONV_TO_OVF_I: {
3821                         /* Valid ints: 0xffffffff:8000000 to 00000000:0x7f000000 */
3822                         short int *o[5];
3823                         s390_ltr  (code, ins->sreg2, ins->sreg2);
3824                         s390_jnl  (code, 0); CODEPTR(code, o[0]);
3825                         s390_ltr  (code, ins->sreg1, ins->sreg1);
3826                         s390_jnl  (code, 0); CODEPTR(code, o[1]);
3827                         s390_lhi  (code, s390_r13, -1);
3828                         s390_cr   (code, ins->sreg1, s390_r13);
3829                         s390_jnz  (code, 0); CODEPTR(code, o[2]);
3830                         if (ins->dreg != ins->sreg2)
3831                                 s390_lr   (code, ins->dreg, ins->sreg2);
3832                         s390_j    (code, 0); CODEPTR(code, o[3]);
3833                         PTRSLOT(code, o[0]);
3834                         s390_jz   (code, 0); CODEPTR(code, o[4]);
3835                         PTRSLOT(code, o[1]);
3836                         PTRSLOT(code, o[2]);
3837                         mono_add_patch_info (cfg, code - cfg->native_code,
3838                                              MONO_PATCH_INFO_EXC, "OverflowException");
3839                         s390_brasl (code, s390_r14, 0);
3840                         PTRSLOT(code, o[3]);
3841                         PTRSLOT(code, o[4]);
3842                         break;
3843                 }
3844                 case OP_SQRT:
3845                         s390_sqdbr (code, ins->dreg, ins->sreg1);
3846                         break;
3847                 case OP_FADD:
3848                         if (ins->dreg == ins->sreg1)
3849                                 s390_adbr (code, ins->dreg, ins->sreg2);
3850                         else {
3851                                 if (ins->dreg == ins->sreg2)
3852                                         s390_adbr (code, ins->dreg, ins->sreg1);
3853                                 else {
3854                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3855                                         s390_adbr (code, ins->dreg, ins->sreg2);
3856                                 }
3857                         }
3858                         break;
3859                 case OP_FSUB:
3860                         if (ins->dreg == ins->sreg1)
3861                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3862                         else {
3863                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3864                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3865                         }
3866                         break;
3867                 case OP_FMUL:
3868                         if (ins->dreg == ins->sreg1)
3869                                 s390_mdbr (code, ins->dreg, ins->sreg2);
3870                         else {
3871                                 if (ins->dreg == ins->sreg2)
3872                                         s390_mdbr (code, ins->dreg, ins->sreg1);
3873                                 else {
3874                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3875                                         s390_mdbr (code, ins->dreg, ins->sreg2);
3876                                 }
3877                         }
3878                         break;
3879                 case OP_FDIV:
3880                         if (ins->dreg == ins->sreg1)
3881                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3882                         else {
3883                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3884                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3885                         }
3886                         break;
3887                 case OP_FNEG:
3888                         s390_lcdbr (code, ins->dreg, ins->sreg1);
3889                         break;
3890                 case OP_FREM:
3891                         if (ins->dreg != ins->sreg1) {
3892                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3893                         }
3894                         s390_didbr (code, ins->dreg, ins->sreg2, 5, s390_f15);
3895                         break;
3896                 case OP_FCOMPARE:
3897                         s390_cdbr (code, ins->sreg1, ins->sreg2);
3898                         break;
3899                 case OP_FCEQ:
3900                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3901                         s390_lhi   (code, ins->dreg, 1);
3902                         s390_je    (code, 4);
3903                         s390_lhi   (code, ins->dreg, 0);
3904                         break;
3905                 case OP_FCLT:
3906                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3907                         s390_lhi   (code, ins->dreg, 1);
3908                         s390_jl    (code, 4);
3909                         s390_lhi   (code, ins->dreg, 0);
3910                         break;
3911                 case OP_FCLT_UN:
3912                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3913                         s390_lhi   (code, ins->dreg, 1);
3914                         s390_jlo   (code, 4);
3915                         s390_lhi   (code, ins->dreg, 0);
3916                         break;
3917                 case OP_FCGT:
3918                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3919                         s390_lhi   (code, ins->dreg, 1);
3920                         s390_jh    (code, 4);
3921                         s390_lhi   (code, ins->dreg, 0);
3922                         break;
3923                 case OP_FCGT_UN:
3924                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3925                         s390_lhi   (code, ins->dreg, 1);
3926                         s390_jho   (code, 4);
3927                         s390_lhi   (code, ins->dreg, 0);
3928                         break;
3929                 case OP_FBEQ:
3930                         EMIT_COND_BRANCH (ins, S390_CC_EQ|S390_CC_OV);
3931                         break;
3932                 case OP_FBNE_UN:
3933                         EMIT_COND_BRANCH (ins, S390_CC_NE|S390_CC_OV);
3934                         break;
3935                 case OP_FBLT:
3936                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3937                         break;
3938                 case OP_FBLT_UN:
3939                         EMIT_COND_BRANCH (ins, S390_CC_LT|S390_CC_OV);
3940                         break;
3941                 case OP_FBGT:
3942                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3943                         break;
3944                 case OP_FBGT_UN:
3945                         EMIT_COND_BRANCH (ins, S390_CC_GT|S390_CC_OV);
3946                         break;
3947                 case OP_FBGE:
3948                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3949                         break;
3950                 case OP_FBGE_UN:
3951                         EMIT_COND_BRANCH (ins, S390_CC_GE|S390_CC_OV);
3952                         break;
3953                 case OP_FBLE:
3954                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3955                         break;
3956                 case OP_FBLE_UN:
3957                         EMIT_COND_BRANCH (ins, S390_CC_LE|S390_CC_OV);
3958                         break;
3959                 case CEE_CKFINITE: {
3960                         short *o;
3961                         s390_lhi  (code, s390_r13, 0xfc0);
3962                         s390_tcdb (code, ins->sreg1, 0, s390_r13, 0);
3963                         s390_jz   (code, 0); CODEPTR(code, o);
3964                         mono_add_patch_info (cfg, code - cfg->native_code + 2,
3965                                              MONO_PATCH_INFO_EXC, "ArithmeticException");
3966                         s390_brasl (code, s390_r14,0);
3967                         PTRSLOT(code, o);
3968                         break;
3969                 }
3970                 default:
3971                         g_warning ("unknown opcode %s in %s()\n", mono_inst_name (ins->opcode), __FUNCTION__);
3972                         g_assert_not_reached ();
3973                 }
3974
3975                 if ((cfg->opt & MONO_OPT_BRANCH) && ((code - cfg->native_code - offset) > max_len)) {
3976                         g_warning ("wrong maximal instruction length of instruction %s (expected %d, got %d)",
3977                                    mono_inst_name (ins->opcode), max_len, code - cfg->native_code - offset);
3978                         g_assert_not_reached ();
3979                 }
3980
3981                 cpos += max_len;
3982
3983                 last_ins = ins;
3984                 last_offset = offset;
3985
3986                 ins = ins->next;
3987         }
3988
3989         cfg->code_len = code - cfg->native_code;
3990 }
3991
3992 /*========================= End of Function ========================*/
3993
3994 /*------------------------------------------------------------------*/
3995 /*                                                                  */
3996 /* Name         - mono_arch_register_lowlevel_calls                 */
3997 /*                                                                  */
3998 /* Function     - Register routines to help with --trace operation. */
3999 /*                                                                  */
4000 /*------------------------------------------------------------------*/
4001
4002 void
4003 mono_arch_register_lowlevel_calls (void)
4004 {
4005         mono_register_jit_icall (enter_method, "mono_enter_method", NULL, TRUE);
4006         mono_register_jit_icall (leave_method, "mono_leave_method", NULL, TRUE);
4007 }
4008
4009 /*========================= End of Function ========================*/
4010
4011 /*------------------------------------------------------------------*/
4012 /*                                                                  */
4013 /* Name         - mono_arch_patch_code                              */
4014 /*                                                                  */
4015 /* Function     - Process the patch data created during the         */
4016 /*                instruction build process. This resolves jumps,   */
4017 /*                calls, variables etc.                             */
4018 /*                                                                  */
4019 /*------------------------------------------------------------------*/
4020
4021 void
4022 mono_arch_patch_code (MonoMethod *method, MonoDomain *domain, guint8 *code, MonoJumpInfo *ji, gboolean run_cctors)
4023 {
4024         MonoJumpInfo *patch_info;
4025
4026         for (patch_info = ji; patch_info; patch_info = patch_info->next) {
4027                 unsigned char *ip = patch_info->ip.i + code;
4028                 gint32 target = 0;
4029
4030                 switch (patch_info->type) {
4031                 case MONO_PATCH_INFO_BB:
4032                         target = S390_RELATIVE((patch_info->data.bb->native_offset+code),
4033                                                ip);
4034                         ip    += 2;     /* Skip over op-code */
4035                         break;
4036                 case MONO_PATCH_INFO_ABS:
4037                         target = S390_RELATIVE(patch_info->data.target, ip);
4038                         ip    += 2;     /* Skip over op-code */
4039                         break;
4040                 case MONO_PATCH_INFO_LABEL:
4041                         target = S390_RELATIVE((patch_info->data.inst->inst_c0+code),ip);
4042                         ip    += 2;     /* Skip over op-code */
4043                         break;
4044                 case MONO_PATCH_INFO_IP:
4045                         target = ip;
4046                         continue;
4047                 case MONO_PATCH_INFO_METHOD_REL:
4048                         g_assert_not_reached ();
4049                         *((gpointer *)(ip)) = code + patch_info->data.offset;
4050                         continue;
4051                 case MONO_PATCH_INFO_INTERNAL_METHOD: {
4052                         MonoJitICallInfo *mi = mono_find_jit_icall_by_name (patch_info->data.name);
4053                         if (!mi) {
4054                                 g_warning ("unknown MONO_PATCH_INFO_INTERNAL_METHOD %s", patch_info->data.name);
4055                                 g_assert_not_reached ();
4056                         }
4057                         target = S390_RELATIVE(mono_icall_get_wrapper (mi), ip);
4058                         ip    += 2;     /* Skip over op-code */
4059                         break;
4060                 }
4061                 case MONO_PATCH_INFO_METHOD_JUMP:
4062                         g_assert_not_reached ();
4063                         break;
4064                 case MONO_PATCH_INFO_METHOD:
4065                         if (patch_info->data.method == method) {
4066                                 target = S390_RELATIVE(code, ip);
4067                         } else {
4068                                 /* get the trampoline to the method from the domain */
4069                                 target = S390_RELATIVE(mono_arch_create_jit_trampoline (patch_info->data.method), ip);
4070                                 target = mono_arch_create_jit_trampoline(patch_info->data.method);
4071                                 target = S390_RELATIVE(target, ip);
4072                         }
4073                         ip    += 2;     /* Skip over op-code */
4074                         break;
4075                 case MONO_PATCH_INFO_SWITCH: {
4076                         gpointer *table = (gpointer *)patch_info->data.target;
4077                         int i;
4078                         /*------------------------------------------------------*/
4079                         /* ip is pointing at the basr r13,0/j +4 instruction    */
4080                         /* the vtable value follows this (i.e. ip+6)            */
4081                         /*------------------------------------------------------*/
4082                         *((gconstpointer *)(ip+6)) = table;
4083
4084                         for (i = 0; i < patch_info->table_size; i++) {
4085                                 table [i] = (int)patch_info->data.table [i] + code;
4086                         }
4087                         continue;
4088                 }
4089                 case MONO_PATCH_INFO_METHODCONST:
4090                 case MONO_PATCH_INFO_CLASS:
4091                 case MONO_PATCH_INFO_IMAGE:
4092                 case MONO_PATCH_INFO_FIELD:
4093                         target = S390_RELATIVE(patch_info->data.target, ip);
4094                         continue;
4095                 case MONO_PATCH_INFO_R4:
4096                 case MONO_PATCH_INFO_R8:
4097                         g_assert_not_reached ();
4098                         *((gconstpointer *)(ip + 2)) = patch_info->data.target;
4099                         continue;
4100                 case MONO_PATCH_INFO_IID:
4101                         mono_class_init (patch_info->data.klass);
4102                         target = S390_RELATIVE(patch_info->data.klass->interface_id, ip);
4103                         continue;
4104                 case MONO_PATCH_INFO_VTABLE:
4105                         target = S390_RELATIVE(mono_class_vtable (domain, patch_info->data.klass),ip);
4106                         ip += 2;
4107                         continue;
4108                 case MONO_PATCH_INFO_CLASS_INIT:
4109                         target = S390_RELATIVE(mono_create_class_init_trampoline (mono_class_vtable (domain, patch_info->data.klass)), ip);
4110                         ip += 2;
4111                         break;
4112                 case MONO_PATCH_INFO_SFLDA: {
4113                         MonoVTable *vtable = mono_class_vtable (domain, patch_info->data.field->parent);
4114                         if (!vtable->initialized && !(vtable->klass->flags & TYPE_ATTRIBUTE_BEFORE_FIELD_INIT) && mono_class_needs_cctor_run (vtable->klass, method))
4115                                 /* Done by the generated code */
4116                                 ;
4117                         else {
4118                                 if (run_cctors)
4119                                         mono_runtime_class_init (vtable);
4120                         }
4121                         target = S390_RELATIVE((char*)vtable->data + patch_info->data.field->offset, ip);
4122                         ip += 2;
4123                         continue;
4124                 }
4125                 case MONO_PATCH_INFO_EXC_NAME:
4126                         *((gconstpointer *)(ip)) = patch_info->data.name;
4127                         continue;
4128                 case MONO_PATCH_INFO_LDSTR:
4129                         target = mono_ldstr (domain, patch_info->data.token->image,
4130                                              mono_metadata_token_index (patch_info->data.token->token));
4131                         continue;
4132                 case MONO_PATCH_INFO_TYPE_FROM_HANDLE: {
4133                         gpointer handle;
4134                         MonoClass *handle_class;
4135
4136                         handle = mono_ldtoken (patch_info->data.token->image,
4137                                                patch_info->data.token->token,
4138                                                &handle_class, NULL);
4139                         mono_class_init (handle_class);
4140                         mono_class_init (mono_class_from_mono_type (handle));
4141
4142                         target = handle;
4143                         continue;
4144                 }
4145                 case MONO_PATCH_INFO_LDTOKEN: {
4146                         gpointer handle;
4147                         MonoClass *handle_class;
4148
4149                         handle = mono_ldtoken (patch_info->data.token->image,
4150                                                patch_info->data.token->token,
4151                                                &handle_class, NULL);
4152                         mono_class_init (handle_class);
4153
4154                         target = handle;
4155                         continue;
4156                 }
4157                 case MONO_PATCH_INFO_EXC:
4158                         /* everything is dealt with at epilog output time */
4159                         continue;
4160                 default:
4161                         g_assert_not_reached ();
4162                 }
4163                 s390_patch (ip, target);
4164         }
4165 }
4166
4167 /*========================= End of Function ========================*/
4168
4169 /*------------------------------------------------------------------*/
4170 /*                                                                  */
4171 /* Name         - mono_arch_max_epilog_size                         */
4172 /*                                                                  */
4173 /* Function     - Determine the maximum size of the epilog code.    */
4174 /*                                                                  */
4175 /*------------------------------------------------------------------*/
4176
4177 int
4178 mono_arch_max_epilog_size (MonoCompile *cfg)
4179 {
4180         int max_epilog_size = 96;
4181         MonoJumpInfo *patch_info;
4182
4183         if (cfg->method->save_lmf)
4184                 max_epilog_size += 128;
4185
4186         if (mono_jit_trace_calls != NULL)
4187                 max_epilog_size += 128;
4188
4189         if (cfg->prof_options & MONO_PROFILE_ENTER_LEAVE)
4190                 max_epilog_size += 128;
4191
4192         /* count the number of exception infos */
4193
4194         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4195                 if (patch_info->type == MONO_PATCH_INFO_EXC)
4196                         max_epilog_size += 26;
4197         }
4198
4199         return max_epilog_size;
4200 }
4201
4202 /*========================= End of Function ========================*/
4203
4204 /*------------------------------------------------------------------*/
4205 /*                                                                  */
4206 /* Name         - mono_arch_emit_prolog                             */
4207 /*                                                                  */
4208 /* Function     - Create the instruction sequence for a function    */
4209 /*                prolog.                                           */
4210 /*                                                                  */
4211 /*------------------------------------------------------------------*/
4212
4213 guint8 *
4214 mono_arch_emit_prolog (MonoCompile *cfg)
4215 {
4216         MonoMethod *method = cfg->method;
4217         MonoBasicBlock *bb;
4218         MonoMethodSignature *sig;
4219         MonoInst *inst;
4220         int alloc_size, pos, max_offset, i, lmfOffset;
4221         guint8 *code;
4222         CallInfo *cinfo;
4223         size_data sz;
4224         int tracing = 0;
4225
4226         if (mono_jit_trace_calls != NULL && mono_trace_eval (method))
4227                 tracing = 1;
4228
4229         cfg->code_size   = 256;
4230         cfg->native_code = code = g_malloc (cfg->code_size);
4231
4232         s390_stm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4233
4234         if (cfg->flags & MONO_CFG_HAS_ALLOCA) {
4235                 cfg->used_int_regs |= 1 << 11;
4236         }
4237
4238         alloc_size = cfg->stack_offset;
4239 //      if (tracing)
4240 //              alloc_size += S390_TRACE_STACK_SIZE;
4241 //      pos = 0;
4242         /* reserve room to save return value */
4243 //      if (tracing)
4244 //              pos += 8;
4245
4246 //      alloc_size += pos;
4247
4248 //      if (method->save_lmf)
4249 //              alloc_size += sizeof(MonoLMF);
4250
4251 //      alloc_size = S390_ALIGN(alloc_size, S390_STACK_ALIGNMENT);
4252
4253         cfg->stack_usage = alloc_size;
4254         s390_lr   (code, s390_r11, STK_BASE);
4255         if (s390_is_imm16 (-alloc_size)) {
4256                 s390_ahi  (code, STK_BASE, -alloc_size);
4257         } else {
4258                 int stackSize = alloc_size;
4259                 while (stackSize > 32767) {
4260                         s390_ahi  (code, STK_BASE, -32767);
4261                         stackSize -= 32767;
4262                 }
4263                 s390_ahi  (code, STK_BASE, -stackSize);
4264         }
4265         s390_st   (code, s390_r11, 0, STK_BASE, 0);
4266
4267         if (cfg->flags & MONO_CFG_HAS_ALLOCA)
4268                 s390_lr (code, s390_r11, STK_BASE);
4269
4270         /* compute max_offset in order to use short forward jumps
4271          * we always do it on s390 because the immediate displacement
4272          * for jumps is too small
4273          */
4274         max_offset = 0;
4275         for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
4276                 MonoInst *ins = bb->code;
4277                 bb->max_offset = max_offset;
4278
4279                 if (cfg->prof_options & MONO_PROFILE_COVERAGE)
4280                         max_offset += 6;
4281
4282                 while (ins) {
4283                         max_offset += ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
4284                         ins = ins->next;
4285                 }
4286         }
4287
4288         /* load arguments allocated to register from the stack */
4289         sig = method->signature;
4290         pos = 0;
4291
4292         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
4293
4294         if (cinfo->struct_ret) {
4295                 ArgInfo *ainfo = &cinfo->ret;
4296                 inst         = cfg->ret;
4297                 inst->unused = ainfo->vtsize;
4298                 s390_st (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4299         }
4300
4301         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
4302                 ArgInfo *ainfo = cinfo->args + i;
4303                 inst = cfg->varinfo [pos];
4304
4305                 if (inst->opcode == OP_REGVAR) {
4306                         if (ainfo->regtype == RegTypeGeneral)
4307                                 s390_lr (code, inst->dreg, ainfo->reg);
4308                         else if (ainfo->regtype == RegTypeFP) {
4309                                 if (ainfo->size == 4) {
4310                                         s390_ledbr (code, inst->dreg, ainfo->reg);
4311                                 } else {
4312                                         s390_ldr   (code, inst->dreg, ainfo->reg);
4313                                 }
4314                         }
4315                         else if (ainfo->regtype == RegTypeBase) {
4316                                 s390_lr  (code, s390_r13, STK_BASE);
4317                                 s390_ahi (code, s390_r13, alloc_size);
4318                                 s390_l   (code, inst->dreg, 0, s390_r13, ainfo->offset);
4319                         } else
4320                                 g_assert_not_reached ();
4321
4322                         if (cfg->verbose_level > 2)
4323                                 g_print ("Argument %d assigned to register %s\n",
4324                                          pos, mono_arch_regname (inst->dreg));
4325                 } else {
4326                         if (ainfo->regtype == RegTypeGeneral) {
4327                                 if (!((ainfo->reg >= 2) && (ainfo->reg <= 6)))
4328                                         g_assert_not_reached();
4329                                 switch (ainfo->size) {
4330                                 case 1:
4331                                         s390_stc (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4332                                         break;
4333                                 case 2:
4334                                         s390_sth (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4335                                         break;
4336                                 case 8:
4337                                         s390_stm (code, ainfo->reg, ainfo->reg + 1,
4338                                                   inst->inst_basereg, inst->inst_offset);
4339                                         break;
4340                                 default:
4341                                         s390_st  (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4342                                 }
4343                         } else if (ainfo->regtype == RegTypeBase) {
4344                         } else if (ainfo->regtype == RegTypeFP) {
4345                                 if (ainfo->size == 8)
4346                                         s390_std (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4347                                 else if (ainfo->size == 4)
4348                                         s390_ste (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4349                                 else
4350                                         g_assert_not_reached ();
4351                         } else if (ainfo->regtype == RegTypeStructByVal) {
4352                                 int doffset = inst->inst_offset;
4353                                 int reg;
4354                                 if (ainfo->reg != STK_BASE)
4355                                         reg = ainfo->reg;
4356                                 else {
4357                                         reg = s390_r0;
4358                                         s390_lr  (code, s390_r13, STK_BASE);
4359                                         s390_ahi (code, s390_r13, alloc_size);
4360                                 }
4361                                 switch (ainfo->size) {
4362                                         case 1:
4363                                                 if (ainfo->reg == STK_BASE)
4364                                                         s390_ic  (code, reg, 0, s390_r13, ainfo->offset+3);
4365                                                 s390_stc (code, reg, 0, inst->inst_basereg, doffset);
4366                                                 break;
4367                                         case 2:
4368                                                 if (ainfo->reg == STK_BASE)
4369                                                         s390_lh  (code, reg, 0, s390_r13, ainfo->offset+2);
4370                                                 s390_sth (code, reg, 0, inst->inst_basereg, doffset);
4371                                                 break;
4372                                         case 4:
4373                                                 if (ainfo->reg == STK_BASE)
4374                                                         s390_l   (code, reg, 0, s390_r13, ainfo->offset);
4375                                                 s390_st  (code, reg, 0, inst->inst_basereg, doffset);
4376                                                 break;
4377                                         case 8:
4378                                                 if (ainfo->reg == STK_BASE)
4379                                                         s390_lm  (code, s390_r0, s390_r1, s390_r13, ainfo->offset);
4380                                                 s390_stm (code, reg, reg+1, inst->inst_basereg, doffset);
4381                                                 break;
4382                                 }
4383                         } else if (ainfo->regtype == RegTypeStructByAddr) {
4384                                 code = emit_memcpy (code, ainfo->vtsize,
4385                                                     inst->inst_basereg, inst->inst_offset, ainfo->reg, 0);
4386                         } else
4387                                 g_assert_not_reached ();
4388                 }
4389                 pos++;
4390         }
4391
4392         if (method->save_lmf) {
4393                 /*---------------------------------------------------------------*/
4394                 /* Preserve the parameter registers while we fix up the lmf      */
4395                 /*---------------------------------------------------------------*/
4396                 s390_lr (code, s390_r7, s390_r2);
4397                 s390_lr (code, s390_r8, s390_r3);
4398                 s390_lr (code, s390_r9, s390_r4);
4399                 s390_lr (code, s390_r10, s390_r5);
4400
4401                 mono_add_patch_info (cfg, code - cfg->native_code,
4402                                      MONO_PATCH_INFO_INTERNAL_METHOD,
4403                                      (gpointer)"mono_get_lmf_addr");
4404                 /*---------------------------------------------------------------*/
4405                 /* On return from this call r2 have the address of the &lmf      */
4406                 /*---------------------------------------------------------------*/
4407                 s390_brasl (code, s390_r14, 0);
4408
4409                 /*---------------------------------------------------------------*/
4410                 /* we build the MonoLMF structure on the stack - see mini-s390.h */
4411                 /*---------------------------------------------------------------*/
4412                 lmfOffset = alloc_size - sizeof(MonoLMF);
4413
4414                 s390_lr    (code, s390_r13, cfg->frame_reg);
4415                 s390_ahi   (code, s390_r13, lmfOffset);
4416
4417                 /*---------------------------------------------------------------*/
4418                 /* Set lmf.lmf_addr = jit_tls->lmf                               */
4419                 /*---------------------------------------------------------------*/
4420                 s390_st    (code, s390_r2, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4421
4422                 /*---------------------------------------------------------------*/
4423                 /* Get current lmf                                               */
4424                 /*---------------------------------------------------------------*/
4425                 s390_l     (code, s390_r0, 0, s390_r2, 0);
4426
4427                 /*---------------------------------------------------------------*/
4428                 /* Set our lmf as the current lmf                                */
4429                 /*---------------------------------------------------------------*/
4430                 s390_st    (code, s390_r13, 0, s390_r2, 0);
4431
4432                 /*---------------------------------------------------------------*/
4433                 /* Have our lmf.previous_lmf point to the last lmf               */
4434                 /*---------------------------------------------------------------*/
4435                 s390_st    (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4436
4437                 /*---------------------------------------------------------------*/
4438                 /* save method info                                              */
4439                 /*---------------------------------------------------------------*/
4440                 s390_basr  (code, s390_r1, 0);
4441                 s390_j     (code, 4);
4442                 s390_word  (code, method);
4443                 s390_l     (code, s390_r1, 0, s390_r1, 4);
4444                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, method));
4445
4446                 /*---------------------------------------------------------------*/
4447                 /* save the current IP                                           */
4448                 /*---------------------------------------------------------------*/
4449                 s390_lr    (code, s390_r1, cfg->frame_reg);
4450                 s390_ahi   (code, s390_r1, alloc_size);
4451                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
4452                 s390_l     (code, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
4453                 s390_la    (code, s390_r1, 0, s390_r1, 0);
4454                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
4455
4456                 /*---------------------------------------------------------------*/
4457                 /* Restore the parameter registers now that we've set up the lmf */
4458                 /*---------------------------------------------------------------*/
4459                 s390_lr (code, s390_r2, s390_r7);
4460                 s390_lr (code, s390_r3, s390_r8);
4461                 s390_lr (code, s390_r4, s390_r9);
4462                 s390_lr (code, s390_r5, s390_r10);
4463         }
4464
4465         if (tracing)
4466                 code = mono_arch_instrument_prolog (cfg, enter_method, code, TRUE);
4467
4468         cfg->code_len = code - cfg->native_code;
4469         g_free (cinfo);
4470
4471         return code;
4472 }
4473
4474 /*========================= End of Function ========================*/
4475
4476 /*------------------------------------------------------------------*/
4477 /*                                                                  */
4478 /* Name         - mono_arch_emit_epilog                             */
4479 /*                                                                  */
4480 /* Function     - Emit the instructions for a function epilog.      */
4481 /*                                                                  */
4482 /*------------------------------------------------------------------*/
4483
4484 void
4485 mono_arch_emit_epilog (MonoCompile *cfg)
4486 {
4487         MonoJumpInfo *patch_info;
4488         MonoMethod *method = cfg->method;
4489         MonoMethodSignature *sig = method->signature;
4490         MonoInst *inst;
4491         int i, lmfOffset, tracing = 0;
4492         guint8 *code;
4493
4494         code = cfg->native_code + cfg->code_len;
4495
4496         if (mono_jit_trace_calls != NULL && mono_trace_eval (method)) {
4497                 code = mono_arch_instrument_epilog (cfg, leave_method, code, TRUE);
4498                 tracing = 1;
4499         }
4500
4501         if (method->save_lmf) {
4502                 s390_lr  (code, s390_r13, cfg->frame_reg);
4503
4504                 lmfOffset = cfg->stack_usage -  sizeof(MonoLMF);
4505
4506                 /*-------------------------------------------------*/
4507                 /* r13 = my lmf                                    */
4508                 /*-------------------------------------------------*/
4509                 s390_ahi (code, s390_r13, lmfOffset);
4510
4511                 /*-------------------------------------------------*/
4512                 /* r6 = &jit_tls->lmf                              */
4513                 /*-------------------------------------------------*/
4514                 s390_l   (code, s390_r6, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4515
4516                 /*-------------------------------------------------*/
4517                 /* r0 = lmf.previous_lmf                           */
4518                 /*-------------------------------------------------*/
4519                 s390_l   (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4520
4521                 /*-------------------------------------------------*/
4522                 /* jit_tls->lmf = previous_lmf                     */
4523                 /*-------------------------------------------------*/
4524                 s390_l   (code, s390_r13, 0, s390_r6, 0);
4525                 s390_st  (code, s390_r0, 0, s390_r6, 0);
4526         }
4527
4528         if (cfg->frame_reg != STK_BASE)
4529                 s390_lr  (code, STK_BASE, cfg->frame_reg);
4530
4531         s390_ahi (code, STK_BASE, cfg->stack_usage);
4532         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4533         s390_br  (code, s390_r14);
4534
4535         /* add code to raise exceptions */
4536         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4537                 switch (patch_info->type) {
4538                 case MONO_PATCH_INFO_EXC: {
4539                         /*-----------------------------------------------------*/
4540                         /* Patch the branch in epilog to come here             */
4541                         /*-----------------------------------------------------*/
4542                         s390_patch (patch_info->ip.i+cfg->native_code+2,
4543                                     S390_RELATIVE(code,patch_info->ip.i+cfg->native_code));
4544                         /*-----------------------------------------------------*/
4545                         /* Patch the parameter passed to the handler           */
4546                         /*-----------------------------------------------------*/
4547                         s390_basr (code, s390_r13, 0);
4548                         s390_j    (code, 4);
4549                         mono_add_patch_info (cfg, code - cfg->native_code,
4550                                              MONO_PATCH_INFO_EXC_NAME,
4551                                              patch_info->data.target);
4552                         s390_word (code, 0);
4553                         /*-----------------------------------------------------*/
4554                         /* Load the return address and the parameter register  */
4555                         /*-----------------------------------------------------*/
4556                         s390_larl (code, s390_r14, S390_RELATIVE((patch_info->ip.i +
4557                                                    cfg->native_code + 8), code));
4558                         s390_l    (code, s390_r2, 0, s390_r13, 4);
4559                         /*-----------------------------------------------------*/
4560                         /* Reuse the current patch to set the jump             */
4561                         /*-----------------------------------------------------*/
4562                         patch_info->type      = MONO_PATCH_INFO_INTERNAL_METHOD;
4563                         patch_info->data.name = "mono_arch_throw_exception_by_name";
4564                         patch_info->ip.i      = code - cfg->native_code;
4565                         s390_jcl  (code, S390_CC_UN, 0);
4566                         break;
4567                 }
4568                 default:
4569                         /* do nothing */
4570                         break;
4571                 }
4572         }
4573
4574         cfg->code_len = code - cfg->native_code;
4575
4576         g_assert (cfg->code_len < cfg->code_size);
4577
4578 }
4579
4580 /*========================= End of Function ========================*/
4581
4582 /*------------------------------------------------------------------*/
4583 /*                                                                  */
4584 /* Name         - mono_arch_setup_jit_tls_data                      */
4585 /*                                                                  */
4586 /* Function     - Setup the JIT's Thread Level Specific Data.       */
4587 /*                                                                  */
4588 /*------------------------------------------------------------------*/
4589
4590 void
4591 mono_arch_setup_jit_tls_data (MonoJitTlsData *tls)
4592 {
4593 }
4594
4595 /*========================= End of Function ========================*/
4596
4597 /*------------------------------------------------------------------*/
4598 /*                                                                  */
4599 /* Name         - mono_arch_free_jit_tls_data                       */
4600 /*                                                                  */
4601 /* Function     - Free tls data.                                    */
4602 /*                                                                  */
4603 /*------------------------------------------------------------------*/
4604
4605 void
4606 mono_arch_free_jit_tls_data (MonoJitTlsData *tls)
4607 {
4608 }
4609
4610 /*========================= End of Function ========================*/
4611
4612 /*------------------------------------------------------------------*/
4613 /*                                                                  */
4614 /* Name         - mono_arch_emit_this_vret_args                     */
4615 /*                                                                  */
4616 /* Function     -                                                   */
4617 /*                                                                  */
4618 /*------------------------------------------------------------------*/
4619
4620 void
4621 mono_arch_emit_this_vret_args (MonoCompile *cfg, MonoCallInst *inst, int this_reg, int this_type, int vt_reg)
4622 {
4623         int this_dreg = s390_r2;
4624
4625         if (vt_reg != -1)
4626                 this_dreg = s390_r3;
4627
4628         /* add the this argument */
4629         if (this_reg != -1) {
4630                 MonoInst *this;
4631                 MONO_INST_NEW (cfg, this, OP_SETREG);
4632                 this->type = this_type;
4633                 this->sreg1 = this_reg;
4634                 this->dreg = this_dreg;
4635                 mono_bblock_add_inst (cfg->cbb, this);
4636         }
4637
4638         if (vt_reg != -1) {
4639                 MonoInst *vtarg;
4640                 MONO_INST_NEW (cfg, vtarg, OP_SETREG);
4641                 vtarg->type = STACK_MP;
4642                 vtarg->sreg1 = vt_reg;
4643                 vtarg->dreg = s390_r2;
4644                 mono_bblock_add_inst (cfg->cbb, vtarg);
4645         }
4646 }
4647
4648 /*========================= End of Function ========================*/
4649
4650 /*------------------------------------------------------------------*/
4651 /*                                                                  */
4652 /* Name         - mono_arch_get_opcode_for_method                   */
4653 /*                                                                  */
4654 /* Function     - Check for opcodes we can handle directly in       */
4655 /*                hardware.                                         */
4656 /*                                                                  */
4657 /*------------------------------------------------------------------*/
4658
4659 gint
4660 mono_arch_get_opcode_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsig, MonoInst **args)
4661 {
4662         if (cmethod->klass == mono_defaults.math_class) {
4663                 if (strcmp (cmethod->name, "Sqrt") == 0)
4664                         return OP_SQRT;
4665         }
4666         return -1;
4667 }
4668
4669 /*========================= End of Function ========================*/
4670
4671 /*------------------------------------------------------------------*/
4672 /*                                                                  */
4673 /* Name         - mono_arch_print_tree                              */
4674 /*                                                                  */
4675 /* Function     - Print platform-specific opcode details.           */
4676 /*                                                                  */
4677 /* Returns      - 1 - opcode details have been printed              */
4678 /*                0 - opcode details have not been printed          */
4679 /*                                                                  */
4680 /*------------------------------------------------------------------*/
4681
4682 gboolean
4683 mono_arch_print_tree (MonoInst *tree, int arity)
4684 {
4685         gboolean done;
4686
4687         switch (tree->opcode) {
4688                 case OP_S390_LOADARG:
4689                 case OP_S390_ARGPTR:
4690                 case OP_S390_STKARG:
4691                         printf ("[0x%x(%s)]", tree->inst_offset,
4692                                 mono_arch_regname (tree->inst_basereg));
4693                         done = 1;
4694                         break;
4695                 default:
4696                         done = 0;
4697         }
4698         return (done);
4699 }
4700
4701 /*========================= End of Function ========================*/
4702
4703 /*------------------------------------------------------------------*/
4704 /*                                                                  */
4705 /* Name         - mono_arch_regalloc_cost                           */
4706 /*                                                                  */
4707 /* Function     - Determine the cost, in the number of memory       */
4708 /*                references, of the action of allocating the var-  */
4709 /*                iable VMV into a register during global register  */
4710 /*                allocation.                                       */
4711 /*                                                                  */
4712 /* Returns      - Cost                                              */
4713 /*                                                                  */
4714 /*------------------------------------------------------------------*/
4715
4716 guint32
4717 mono_arch_regalloc_cost (MonoCompile *cfg, MonoMethodVar *vmv)
4718 {
4719         /* FIXME: */
4720         return 3;
4721 }
4722
4723 /*========================= End of Function ========================*/