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];
 195         gdouble fp[3];
 196 } 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 += 8;
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, stackOffset;
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 (mono_jit_trace_calls != NULL && mono_trace_eval (m))
1275                 stackOffset = S390_ALIGN((S390_TRACE_STACK_SIZE + 8),
1276                                          S390_STACK_ALIGNMENT);
1277         else
1278                 stackOffset = 0;
1279
1280         if (cinfo->struct_ret) {
1281                 m->ret->opcode = OP_REGVAR;
1282                 m->ret->inst_c0 = s390_r2;
1283         } else {
1284                 /* FIXME: handle long and FP values */
1285                 switch (sig->ret->type) {
1286                 case MONO_TYPE_VOID:
1287                         break;
1288                 default:
1289                         m->ret->opcode = OP_REGVAR;
1290                         m->ret->dreg    = s390_r2;
1291                         break;
1292                 }
1293         }
1294         /* local vars are at a positive offset from the stack pointer
1295          *
1296          * also note that if the function uses alloca, we use s390_r11
1297          * to point at the local variables.
1298          */
1299         offset = S390_MINIMAL_STACK_SIZE; /* linkage area */
1300
1301         /* add parameter area size for called functions */
1302         offset += m->param_area;
1303         offset  = S390_ALIGN(offset, S390_STACK_ALIGNMENT);
1304
1305         /* FIXME: check how to handle this stuff... reserve space to save LMF and caller saved registers */
1306         if (m->method->save_lmf)
1307                 offset += sizeof (MonoLMF);
1308
1309         if (cinfo->struct_ret) {
1310                 inst               = m->ret;
1311                 offset             = S390_ALIGN(offset, sizeof(gpointer));
1312                 inst->inst_offset  = offset;
1313                 inst->opcode       = OP_REGOFFSET;
1314                 inst->inst_basereg = frame_reg;
1315                 offset            += sizeof(gpointer);
1316         }
1317
1318         curinst = m->locals_start;
1319         for (iVar = curinst; iVar < m->num_varinfo; ++iVar) {
1320                 inst = m->varinfo [iVar];
1321                 if (inst->opcode == OP_REGVAR)
1322                         continue;
1323
1324                 /* inst->unused indicates native sized value types, this is used by the
1325                 * pinvoke wrappers when they call functions returning structure */
1326                 if (inst->unused && MONO_TYPE_ISSTRUCT (inst->inst_vtype))
1327                         size = mono_class_native_size (inst->inst_vtype->data.klass, &align);
1328                 else
1329                         size = mono_type_size (inst->inst_vtype, &align);
1330
1331                 offset             = S390_ALIGN(offset, align);
1332                 inst->inst_offset  = offset;
1333                 inst->opcode       = OP_REGOFFSET;
1334                 inst->inst_basereg = frame_reg;
1335                 offset            += size;
1336                 //g_print ("allocating local %d to %d\n", i, inst->inst_offset);
1337         }
1338
1339         curinst = 0;
1340         if (sig->hasthis) {
1341                 inst = m->varinfo [curinst];
1342                 if (inst->opcode != OP_REGVAR) {
1343                         inst->opcode       = OP_REGOFFSET;
1344                         inst->inst_basereg = frame_reg;
1345                         offset             = S390_ALIGN(offset, sizeof(gpointer));
1346                         inst->inst_offset  = offset;
1347                         offset            += sizeof (gpointer);
1348                 }
1349                 curinst++;
1350                 sArg = 1;
1351         } else
1352                 sArg = 0;
1353
1354         eArg = sig->param_count + sArg;
1355
1356         for (iParm = sArg; iParm < eArg; ++iParm) {
1357                 inst = m->varinfo [curinst];
1358                 if (inst->opcode != OP_REGVAR) {
1359                         if (cinfo->args[iParm].regtype == RegTypeStructByVal) {
1360                                 if (cinfo->args[iParm].vtsize != 0) {
1361                                         inst->opcode       = OP_S390_LOADARG;
1362                                         inst->inst_basereg = frame_reg;
1363                                         size               = sizeof(long);
1364                                         offset             = S390_ALIGN(offset, size);
1365                                         inst->inst_offset  = offset;
1366                                 } else {
1367                                         inst->opcode       = OP_S390_ARGPTR;
1368                                         inst->inst_basereg = frame_reg;
1369                                         size               = cinfo->args[iParm].size;
1370                                         offset             = S390_ALIGN(offset, size);
1371                                         inst->inst_offset  = offset;
1372                                 }
1373                         } else {
1374                                 if (cinfo->args[iParm].reg != STK_BASE) {
1375                                         inst->opcode       = OP_REGOFFSET;
1376                                         inst->inst_basereg = frame_reg;
1377                                         size               = (cinfo->args[iParm].size < 8
1378                                                               ? sizeof(long)
1379                                                               : sizeof(long long));
1380                                         offset             = S390_ALIGN(offset, size);
1381                                         inst->inst_offset  = offset;
1382                                 } else {
1383                                         inst->opcode       = OP_S390_STKARG;
1384                                         inst->inst_basereg = frame_reg;
1385                                         size               = (cinfo->args[iParm].size < 4
1386                                                               ? 4 - cinfo->args[iParm].size
1387                                                               : 0);
1388                                         inst->inst_offset  = cinfo->args[iParm].offset +
1389                                                              size;
1390                                         inst->unused       = stackOffset;
1391                                         size               = sizeof(long);
1392                                 }
1393                         }
1394                         offset += size;
1395                 }
1396                 curinst++;
1397         }
1398
1399         /* align the offset */
1400         offset          = S390_ALIGN(offset, S390_STACK_ALIGNMENT);
1401         m->stack_offset = offset;
1402
1403 }
1404
1405 /*========================= End of Function ========================*/
1406
1407 /*------------------------------------------------------------------*/
1408 /*                                                                  */
1409 /* Name         - mono_arch_call_opcode                             */
1410 /*                                                                  */
1411 /* Function     - Take the arguments and generate the arch-specific */
1412 /*                instructions to properly call the function. This  */
1413 /*                includes pushing, moving argments to the correct  */
1414 /*                etc.                                              */
1415 /*                                                                  */
1416 /* Note         - FIXME: We need an alignment solution for          */
1417 /*                enter_method and mono_arch_call_opcode, currently */
1418 /*                alignment in mono_arch_call_opcode is computed    */
1419 /*                without arch_get_argument_info.                   */
1420 /*                                                                  */
1421 /*------------------------------------------------------------------*/
1422
1423 MonoCallInst*
1424 mono_arch_call_opcode (MonoCompile *cfg, MonoBasicBlock* bb, MonoCallInst *call, int is_virtual) {
1425         MonoInst *arg, *in;
1426         MonoMethodSignature *sig;
1427         int i, n;
1428         CallInfo *cinfo;
1429         ArgInfo *ainfo;
1430         size_data sz;
1431
1432         sig = call->signature;
1433         n = sig->param_count + sig->hasthis;
1434
1435         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
1436         if (cinfo->struct_ret)
1437                 call->used_iregs |= 1 << cinfo->struct_ret;
1438
1439         for (i = 0; i < n; ++i) {
1440                 ainfo = cinfo->args + i;
1441                 if (is_virtual && i == 0) {
1442                         /* the argument will be attached to the call instrucion */
1443                         in = call->args [i];
1444                         call->used_iregs |= 1 << ainfo->reg;
1445                 } else {
1446                         MONO_INST_NEW (cfg, arg, OP_OUTARG);
1447                         in = call->args [i];
1448                         arg->cil_code  = in->cil_code;
1449                         arg->inst_left = in;
1450                         arg->type      = in->type;
1451                         /* prepend, we'll need to reverse them later */
1452                         arg->next      = call->out_args;
1453                         call->out_args = arg;
1454                         if (ainfo->regtype == RegTypeGeneral) {
1455                                 arg->unused = ainfo->reg;
1456                                 call->used_iregs |= 1 << ainfo->reg;
1457                                 if (arg->type == STACK_I8)
1458                                         call->used_iregs |= 1 << (ainfo->reg + 1);
1459                         } else if (ainfo->regtype == RegTypeStructByAddr) {
1460                                 arg->unused = ainfo->reg;
1461                                 call->used_iregs |= 1 << ainfo->reg;
1462                         } else if (ainfo->regtype == RegTypeStructByVal) {
1463                                 if (ainfo->reg != STK_BASE) {
1464                                         switch (ainfo->size) {
1465                                         case 0:
1466                                         case 1:
1467                                         case 2:
1468                                         case 4:
1469                                                 call->used_iregs |= 1 << ainfo->reg;
1470                                                 break;
1471                                         case 8:
1472                                                 call->used_iregs |= 1 << ainfo->reg;
1473                                                 call->used_iregs |= 1 << (ainfo->reg+1);
1474                                                 break;
1475                                         }
1476                                 }
1477                                 arg->sreg2    = ainfo->reg;
1478                                 arg->opcode   = OP_OUTARG_VT;
1479                                 if (ainfo->vtsize != 0)
1480                                         arg->unused = -ainfo->vtsize;
1481                                 else
1482                                         arg->unused = ainfo->size;
1483                                 arg->inst_imm = ainfo->offset;
1484                                 arg->sreg1    = ainfo->offparm;
1485                         } else if (ainfo->regtype == RegTypeBase) {
1486                                 arg->opcode = OP_OUTARG;
1487                                 arg->unused = ainfo->reg | (ainfo->size << 8);
1488                                 arg->inst_imm = ainfo->offset;
1489                         } else if (ainfo->regtype == RegTypeFP) {
1490                                 arg->opcode = OP_OUTARG_R8;
1491                                 arg->unused = ainfo->reg;
1492                                 call->used_fregs |= 1 << ainfo->reg;
1493                                 if (ainfo->size == 4) {
1494                                         /* we reduce the precision */
1495                                         MonoInst *conv;
1496                                         MONO_INST_NEW (cfg, conv, OP_FCONV_TO_R4);
1497                                         conv->inst_left = arg->inst_left;
1498                                         arg->inst_left = conv;
1499                                 }
1500                         } else {
1501                                 g_assert_not_reached ();
1502                         }
1503                 }
1504         }
1505         /*
1506          * Reverse the call->out_args list.
1507          */
1508         {
1509                 MonoInst *prev = NULL, *list = call->out_args, *next;
1510                 while (list) {
1511                         next = list->next;
1512                         list->next = prev;
1513                         prev = list;
1514                         list = next;
1515                 }
1516                 call->out_args = prev;
1517         }
1518         call->stack_usage = cinfo->stack_usage;
1519
1520         cfg->param_area   = MAX (cfg->param_area, cinfo->stack_usage);
1521         cfg->flags       |= MONO_CFG_HAS_CALLS;
1522         /*----------------------------------------------------------*/
1523         /* should set more info in call, such as the stack space    */
1524         /* used by the args that needs to be added back to esp      */
1525         /*----------------------------------------------------------*/
1526
1527         g_free (cinfo);
1528         return call;
1529 }
1530
1531 /*========================= End of Function ========================*/
1532
1533 /*------------------------------------------------------------------*/
1534 /*                                                                  */
1535 /* Name         - mono_arch_instrument_mem_needs                    */
1536 /*                                                                  */
1537 /* Function     - Allow tracing to work with this interface (with   */
1538 /*                an optional argument).                            */
1539 /*                                                                  */
1540 /*------------------------------------------------------------------*/
1541
1542 void
1543 mono_arch_instrument_mem_needs (MonoMethod *method, int *stack, int *code)
1544 {
1545         /* no stack room needed now (may be needed for FASTCALL-trace support) */
1546         *stack = 0;
1547         /* split prolog-epilog requirements? */
1548         *code = 50; /* max bytes needed: check this number */
1549 }
1550
1551 /*========================= End of Function ========================*/
1552
1553 /*------------------------------------------------------------------*/
1554 /*                                                                  */
1555 /* Name         - mono_arch_instrument_prolog                       */
1556 /*                                                                  */
1557 /* Function     - Create an "instrumented" prolog.                  */
1558 /*                                                                  */
1559 /*------------------------------------------------------------------*/
1560
1561 void*
1562 mono_arch_instrument_prolog (MonoCompile *cfg, void *func, void *p,
1563                              gboolean enable_arguments)
1564 {
1565         guchar *code = p;
1566         int parmOffset = cfg->stack_usage - S390_TRACE_STACK_SIZE;
1567         int fpOffset   = parmOffset + (5*sizeof(gint32));
1568
1569         s390_stm  (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1570         s390_std  (code, s390_f0, 0, STK_BASE, fpOffset);
1571         s390_std  (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1572         s390_std  (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1573         s390_basr (code, s390_r13, 0);
1574         s390_j    (code, 6);
1575         s390_word (code, cfg->method);
1576         s390_word (code, func);
1577         s390_l    (code, s390_r2, 0, s390_r13, 4);
1578         s390_la   (code, s390_r3, 0, STK_BASE, parmOffset);
1579         s390_lr   (code, s390_r4, STK_BASE);
1580         s390_ahi  (code, s390_r4, cfg->stack_usage);
1581         s390_l    (code, s390_r1, 0, s390_r13, 8);
1582         s390_basr (code, s390_r14, s390_r1);
1583         s390_ld   (code, s390_f2, 0, STK_BASE, fpOffset+2*sizeof(gdouble));
1584         s390_ld   (code, s390_f1, 0, STK_BASE, fpOffset+sizeof(gdouble));
1585         s390_ld   (code, s390_f0, 0, STK_BASE, fpOffset);
1586         s390_lm   (code, s390_r2, s390_r6, STK_BASE, parmOffset);
1587
1588         return code;
1589 }
1590
1591 /*========================= End of Function ========================*/
1592
1593 /*------------------------------------------------------------------*/
1594 /*                                                                  */
1595 /* Name         - mono_arch_instrument_epilog                       */
1596 /*                                                                  */
1597 /* Function     - Create an epilog that will handle the returned    */
1598 /*                values used in instrumentation.                   */
1599 /*                                                                  */
1600 /*------------------------------------------------------------------*/
1601
1602 void*
1603 mono_arch_instrument_epilog (MonoCompile *cfg, void *func, void *p, gboolean enable_arguments)
1604 {
1605         guchar *code = p;
1606         int save_mode = SAVE_NONE;
1607         MonoMethod *method = cfg->method;
1608         int rtype = method->signature->ret->type;
1609
1610 handle_enum:
1611         switch (rtype) {
1612         case MONO_TYPE_VOID:
1613                 /* special case string .ctor icall */
1614                 if (strcmp (".ctor", method->name) && method->klass == mono_defaults.string_class)
1615                         save_mode = SAVE_ONE;
1616                 else
1617                         save_mode = SAVE_NONE;
1618                 break;
1619         case MONO_TYPE_I8:
1620         case MONO_TYPE_U8:
1621                 save_mode = SAVE_TWO;
1622                 break;
1623         case MONO_TYPE_R4:
1624         case MONO_TYPE_R8:
1625                 save_mode = SAVE_FP;
1626                 break;
1627         case MONO_TYPE_VALUETYPE:
1628                 if (method->signature->ret->data.klass->enumtype) {
1629                         rtype = method->signature->ret->data.klass->enum_basetype->type;
1630                         goto handle_enum;
1631                 }
1632                 save_mode = SAVE_STRUCT;
1633                 break;
1634         default:
1635                 save_mode = SAVE_ONE;
1636                 break;
1637         }
1638
1639         switch (save_mode) {
1640         case SAVE_TWO:
1641                 s390_stm (code, s390_r2, s390_r3, cfg->frame_reg, cfg->stack_usage - 8);
1642                 if (enable_arguments) {
1643                         s390_lr (code, s390_r4, s390_r3);
1644                         s390_lr (code, s390_r3, s390_r2);
1645                 }
1646                 break;
1647         case SAVE_ONE:
1648                 s390_st (code, s390_r2, 0, cfg->frame_reg, cfg->stack_usage - 4);
1649                 if (enable_arguments) {
1650                         s390_lr (code, s390_r3, s390_r2);
1651                 }
1652                 break;
1653         case SAVE_FP:
1654                 s390_std (code, s390_f0, 0, cfg->frame_reg, cfg->stack_usage - 8);
1655                 if (enable_arguments) {
1656                         /* FIXME: what reg?  */
1657                         s390_ldr (code, s390_f2, s390_f0);
1658                         s390_lm  (code, s390_r3, s390_r4, cfg->frame_reg, cfg->stack_usage - 8);
1659                 }
1660                 break;
1661         case SAVE_STRUCT:
1662                 s390_st (code, s390_r2, 0, cfg->frame_reg, cfg->stack_usage - 4);
1663                 if (enable_arguments) {
1664                         s390_l (code, s390_r3, 0, cfg->frame_reg,
1665                                 S390_MINIMAL_STACK_SIZE+cfg->param_area);
1666                 }
1667                 break;
1668         case SAVE_NONE:
1669         default:
1670                 break;
1671         }
1672
1673         s390_basr (code, s390_r13, 0);
1674         s390_j    (code, 6);
1675         s390_word (code, cfg->method);
1676         s390_word (code, func);
1677         s390_l    (code, s390_r2, 0, s390_r13, 4);
1678         s390_l    (code, s390_r1, 0, s390_r13, 8);
1679         s390_basr (code, s390_r14, s390_r1);
1680
1681         switch (save_mode) {
1682         case SAVE_TWO:
1683                 s390_lm  (code, s390_r2, s390_r3, cfg->frame_reg, cfg->stack_usage - 8);
1684                 break;
1685         case SAVE_ONE:
1686                 s390_l   (code, s390_r2, 0, cfg->frame_reg, cfg->stack_usage - 4);
1687                 break;
1688         case SAVE_FP:
1689                 s390_ld  (code, s390_f0, 0, cfg->frame_reg, cfg->stack_usage - 8);
1690                 break;
1691         case SAVE_STRUCT:
1692                 s390_l   (code, s390_r2, 0, cfg->frame_reg, cfg->stack_usage - 4);
1693                 break;
1694         case SAVE_NONE:
1695         default:
1696                 break;
1697         }
1698
1699         return code;
1700 }
1701
1702 /*========================= End of Function ========================*/
1703
1704 /*------------------------------------------------------------------*/
1705 /*                                                                  */
1706 /* Name         - peephole_pass                                     */
1707 /*                                                                  */
1708 /* Function     - Form a peephole pass at the code looking for      */
1709 /*                simple optimizations.                             */
1710 /*                                                                  */
1711 /*------------------------------------------------------------------*/
1712
1713 static void
1714 peephole_pass (MonoCompile *cfg, MonoBasicBlock *bb)
1715 {
1716         MonoInst *ins, *last_ins = NULL;
1717         ins = bb->code;
1718
1719         while (ins) {
1720
1721                 switch (ins->opcode) {
1722                 case OP_MUL_IMM:
1723                         /* remove unnecessary multiplication with 1 */
1724                         if (ins->inst_imm == 1) {
1725                                 if (ins->dreg != ins->sreg1) {
1726                                         ins->opcode = OP_MOVE;
1727                                 } else {
1728                                         last_ins->next = ins->next;
1729                                         ins = ins->next;
1730                                         continue;
1731                                 }
1732                         }
1733                         break;
1734                 case OP_LOAD_MEMBASE:
1735                 case OP_LOADI4_MEMBASE:
1736                         /*
1737                          * OP_STORE_MEMBASE_REG reg, offset(basereg)
1738                          * OP_LOAD_MEMBASE offset(basereg), reg
1739                          */
1740                         if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_REG
1741                                          || last_ins->opcode == OP_STORE_MEMBASE_REG) &&
1742                             ins->inst_basereg == last_ins->inst_destbasereg &&
1743                             ins->inst_offset == last_ins->inst_offset) {
1744                                 if (ins->dreg == last_ins->sreg1) {
1745                                         last_ins->next = ins->next;
1746                                         ins = ins->next;
1747                                         continue;
1748                                 } else {
1749                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1750                                         ins->opcode = OP_MOVE;
1751                                         ins->sreg1 = last_ins->sreg1;
1752                                 }
1753
1754                         /*
1755                          * Note: reg1 must be different from the basereg in the second load
1756                          * OP_LOAD_MEMBASE offset(basereg), reg1
1757                          * OP_LOAD_MEMBASE offset(basereg), reg2
1758                          * -->
1759                          * OP_LOAD_MEMBASE offset(basereg), reg1
1760                          * OP_MOVE reg1, reg2
1761                          */
1762                         } if (last_ins && (last_ins->opcode == OP_LOADI4_MEMBASE
1763                                            || last_ins->opcode == OP_LOAD_MEMBASE) &&
1764                               ins->inst_basereg != last_ins->dreg &&
1765                               ins->inst_basereg == last_ins->inst_basereg &&
1766                               ins->inst_offset == last_ins->inst_offset) {
1767
1768                                 if (ins->dreg == last_ins->dreg) {
1769                                         last_ins->next = ins->next;
1770                                         ins = ins->next;
1771                                         continue;
1772                                 } else {
1773                                         ins->opcode = OP_MOVE;
1774                                         ins->sreg1 = last_ins->dreg;
1775                                 }
1776
1777                                 //g_assert_not_reached ();
1778
1779 #if 0
1780                         /*
1781                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1782                          * OP_LOAD_MEMBASE offset(basereg), reg
1783                          * -->
1784                          * OP_STORE_MEMBASE_IMM imm, offset(basereg)
1785                          * OP_ICONST reg, imm
1786                          */
1787                         } else if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_IMM
1788                                                 || last_ins->opcode == OP_STORE_MEMBASE_IMM) &&
1789                                    ins->inst_basereg == last_ins->inst_destbasereg &&
1790                                    ins->inst_offset == last_ins->inst_offset) {
1791                                 //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1792                                 ins->opcode = OP_ICONST;
1793                                 ins->inst_c0 = last_ins->inst_imm;
1794                                 g_assert_not_reached (); // check this rule
1795 #endif
1796                         }
1797                         break;
1798                 case OP_LOADU1_MEMBASE:
1799                 case OP_LOADI1_MEMBASE:
1800                         if (last_ins && (last_ins->opcode == OP_STOREI1_MEMBASE_REG) &&
1801                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1802                                         ins->inst_offset == last_ins->inst_offset) {
1803                                 if (ins->dreg == last_ins->sreg1) {
1804                                         last_ins->next = ins->next;
1805                                         ins = ins->next;
1806                                         continue;
1807                                 } else {
1808                                         //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
1809                                         ins->opcode = OP_MOVE;
1810                                         ins->sreg1 = last_ins->sreg1;
1811                                 }
1812                         }
1813                         break;
1814                 case OP_LOADU2_MEMBASE:
1815                 case OP_LOADI2_MEMBASE:
1816                         if (last_ins && (last_ins->opcode == OP_STOREI2_MEMBASE_REG) &&
1817                                         ins->inst_basereg == last_ins->inst_destbasereg &&
1818                                         ins->inst_offset == last_ins->inst_offset) {
1819                                 if (ins->dreg == last_ins->sreg1) {
1820                                         last_ins->next = ins->next;
1821                                         ins = ins->next;
1822                                         continue;
1823                                 } else {
1824                                         ins->opcode = OP_MOVE;
1825                                         ins->sreg1 = last_ins->sreg1;
1826                                 }
1827                         }
1828                         break;
1829                 case CEE_CONV_I4:
1830                 case CEE_CONV_U4:
1831                 case OP_MOVE:
1832                         /*
1833                          * OP_MOVE reg, reg
1834                          */
1835                         if (ins->dreg == ins->sreg1) {
1836                                 if (last_ins)
1837                                         last_ins->next = ins->next;
1838                                 ins = ins->next;
1839                                 continue;
1840                         }
1841                         /*
1842                          * OP_MOVE sreg, dreg
1843                          * OP_MOVE dreg, sreg
1844                          */
1845                         if (last_ins && last_ins->opcode == OP_MOVE &&
1846                             ins->sreg1 == last_ins->dreg &&
1847                             ins->dreg == last_ins->sreg1) {
1848                                 last_ins->next = ins->next;
1849                                 ins = ins->next;
1850                                 continue;
1851                         }
1852                         break;
1853                 }
1854                 last_ins = ins;
1855                 ins = ins->next;
1856         }
1857         bb->last_ins = last_ins;
1858 }
1859
1860 /*========================= End of Function ========================*/
1861
1862 /*------------------------------------------------------------------*/
1863 /*                                                                  */
1864 /* Name         - mono_spillvar_offset                              */
1865 /*                                                                  */
1866 /* Function     - Returns the offset used by spillvar. It allocates */
1867 /*                a new spill variable if necessary.                */
1868 /*                                                                  */
1869 /*------------------------------------------------------------------*/
1870
1871 static int
1872 mono_spillvar_offset (MonoCompile *cfg, int spillvar)
1873 {
1874         MonoSpillInfo **si, *info;
1875         int i = 0;
1876
1877         si = &cfg->spill_info;
1878
1879         while (i <= spillvar) {
1880
1881                 if (!*si) {
1882                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1883                         info->next = NULL;
1884                         info->offset = cfg->stack_offset;
1885                         cfg->stack_offset += sizeof (gpointer);
1886                 }
1887
1888                 if (i == spillvar)
1889                         return (*si)->offset;
1890
1891                 i++;
1892                 si = &(*si)->next;
1893         }
1894
1895         g_assert_not_reached ();
1896         return 0;
1897 }
1898
1899 /*========================= End of Function ========================*/
1900
1901 /*------------------------------------------------------------------*/
1902 /*                                                                  */
1903 /* Name         - mono_spillvar_offset_float                        */
1904 /*                                                                  */
1905 /* Function     -                                                   */
1906 /*                                                                  */
1907 /*------------------------------------------------------------------*/
1908
1909 static int
1910 mono_spillvar_offset_float (MonoCompile *cfg, int spillvar)
1911 {
1912         MonoSpillInfo **si, *info;
1913         int i = 0;
1914
1915         si = &cfg->spill_info_float;
1916
1917         while (i <= spillvar) {
1918
1919                 if (!*si) {
1920                         *si = info = mono_mempool_alloc (cfg->mempool, sizeof (MonoSpillInfo));
1921                         info->next         = NULL;
1922                         cfg->stack_offset  = S390_ALIGN(cfg->stack_offset, S390_STACK_ALIGNMENT);
1923                         info->offset       = cfg->stack_offset;
1924                         cfg->stack_offset += sizeof (double);
1925                 }
1926
1927                 if (i == spillvar)
1928                         return (*si)->offset;
1929
1930                 i++;
1931                 si = &(*si)->next;
1932         }
1933
1934         g_assert_not_reached ();
1935         return 0;
1936 }
1937
1938 /*========================= End of Function ========================*/
1939
1940 /*------------------------------------------------------------------*/
1941 /*                                                                  */
1942 /* Name         - print_ins                                         */
1943 /*                                                                  */
1944 /* Function     - Decode and print the instruction for tracing.     */
1945 /*                                                                  */
1946 /*------------------------------------------------------------------*/
1947
1948 static void
1949 print_ins (int i, MonoInst *ins)
1950 {
1951         const char *spec = ins_spec [ins->opcode];
1952         g_print ("\t%-2d %s", i, mono_inst_name (ins->opcode));
1953         if (spec [MONO_INST_DEST]) {
1954                 if (ins->dreg >= MONO_MAX_IREGS)
1955                         g_print (" R%d <-", ins->dreg);
1956                 else
1957                         g_print (" %s <-", mono_arch_regname (ins->dreg));
1958         }
1959         if (spec [MONO_INST_SRC1]) {
1960                 if (ins->sreg1 >= MONO_MAX_IREGS)
1961                         g_print (" R%d", ins->sreg1);
1962                 else
1963                         g_print (" %s", mono_arch_regname (ins->sreg1));
1964         }
1965         if (spec [MONO_INST_SRC2]) {
1966                 if (ins->sreg2 >= MONO_MAX_IREGS)
1967                         g_print (" R%d", ins->sreg2);
1968                 else
1969                         g_print (" %s", mono_arch_regname (ins->sreg2));
1970         }
1971         if (spec [MONO_INST_CLOB])
1972                 g_print (" clobbers: %c", spec [MONO_INST_CLOB]);
1973         g_print ("\n");
1974 }
1975
1976 /*========================= End of Function ========================*/
1977
1978 /*------------------------------------------------------------------*/
1979 /*                                                                  */
1980 /* Name         - print_regtrack.                                   */
1981 /*                                                                  */
1982 /* Function     -                                                   */
1983 /*                                                                  */
1984 /*------------------------------------------------------------------*/
1985
1986 static void
1987 print_regtrack (RegTrack *t, int num)
1988 {
1989         int i;
1990         char buf [32];
1991         const char *r;
1992
1993         for (i = 0; i < num; ++i) {
1994                 if (!t [i].born_in)
1995                         continue;
1996                 if (i >= MONO_MAX_IREGS) {
1997                         g_snprintf (buf, sizeof(buf), "R%d", i);
1998                         r = buf;
1999                 } else
2000                         r = mono_arch_regname (i);
2001                 g_print ("liveness: %s [%d - %d]\n", r, t [i].born_in, t[i].last_use);
2002         }
2003 }
2004
2005 /*========================= End of Function ========================*/
2006
2007 /*------------------------------------------------------------------*/
2008 /*                                                                  */
2009 /* Name         - inst_list_prepend                                 */
2010 /*                                                                  */
2011 /* Function     - Prepend an instruction to the list.               */
2012 /*                                                                  */
2013 /*------------------------------------------------------------------*/
2014
2015 static inline InstList*
2016 inst_list_prepend (MonoMemPool *pool, InstList *list, MonoInst *data)
2017 {
2018         InstList *item = mono_mempool_alloc (pool, sizeof (InstList));
2019         item->data = data;
2020         item->prev = NULL;
2021         item->next = list;
2022         if (list)
2023                 list->prev = item;
2024         return item;
2025 }
2026
2027 /*========================= End of Function ========================*/
2028
2029 /*------------------------------------------------------------------*/
2030 /*                                                                  */
2031 /* Name         - get_register_force_spilling                       */
2032 /*                                                                  */
2033 /* Function     - Force the spilling of the variable in the         */
2034 /*                symbolic register 'reg'.                          */
2035 /*                                                                  */
2036 /*------------------------------------------------------------------*/
2037
2038 static int
2039 get_register_force_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, int reg)
2040 {
2041         MonoInst *load;
2042         int i, sel, spill;
2043
2044         sel = cfg->rs->iassign [reg];
2045         i = reg;
2046         spill = ++cfg->spill_count;
2047         cfg->rs->iassign [i] = -spill - 1;
2048         mono_regstate_free_int (cfg->rs, sel);
2049         /*----------------------------------------------------------*/
2050         /* we need to create a spill var and insert a load to sel   */
2051         /* after the current instruction                            */
2052         /*----------------------------------------------------------*/
2053         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2054         load->dreg = sel;
2055         load->inst_basereg = cfg->frame_reg;
2056         load->inst_offset = mono_spillvar_offset (cfg, spill);
2057         if (item->prev) {
2058                 while (ins->next != item->prev->data)
2059                         ins = ins->next;
2060         }
2061         load->next = ins->next;
2062         ins->next  = load;
2063         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n",
2064                         spill, load->inst_offset, i, mono_arch_regname (sel)));
2065         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2066         g_assert (i == sel);
2067
2068         return sel;
2069 }
2070
2071 /*========================= End of Function ========================*/
2072
2073 /*------------------------------------------------------------------*/
2074 /*                                                                  */
2075 /* Name         -  get_register_spilling                            */
2076 /*                                                                  */
2077 /* Function     -                                                   */
2078 /*                                                                  */
2079 /*------------------------------------------------------------------*/
2080
2081 static int
2082 get_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2083 {
2084         MonoInst *load;
2085         int i, sel, spill;
2086
2087         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));
2088         /* exclude the registers in the current instruction */
2089         if (reg != ins->sreg1 &&
2090             (reg_is_freeable (ins->sreg1) ||
2091              (ins->sreg1 >= MONO_MAX_IREGS &&
2092               cfg->rs->iassign [ins->sreg1] >= 0))) {
2093                 if (ins->sreg1 >= MONO_MAX_IREGS)
2094                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg1]);
2095                 else
2096                         regmask &= ~ (1 << ins->sreg1);
2097                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2098         }
2099         if (reg != ins->sreg2 &&
2100             (reg_is_freeable (ins->sreg2) ||
2101              (ins->sreg2 >= MONO_MAX_IREGS &&
2102               cfg->rs->iassign [ins->sreg2] >= 0))) {
2103                 if (ins->sreg2 >= MONO_MAX_IREGS)
2104                         regmask &= ~ (1 << cfg->rs->iassign [ins->sreg2]);
2105                 else
2106                         regmask &= ~ (1 << ins->sreg2);
2107                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2108         }
2109         if (reg != ins->dreg && reg_is_freeable (ins->dreg)) {
2110                 regmask &= ~ (1 << ins->dreg);
2111                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2112         }
2113
2114         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2115         g_assert (regmask); /* need at least a register we can free */
2116         sel = -1;
2117         /* we should track prev_use and spill the register that's farther */
2118         for (i = 0; i < MONO_MAX_IREGS; ++i) {
2119                 if (regmask & (1 << i)) {
2120                         sel = i;
2121                         DEBUG (g_print ("selected register %s has assignment %d\n", mono_arch_regname (sel), cfg->rs->iassign [sel]));
2122                         break;
2123                 }
2124         }
2125         i = cfg->rs->isymbolic [sel];
2126         spill = ++cfg->spill_count;
2127         cfg->rs->iassign [i] = -spill - 1;
2128         mono_regstate_free_int (cfg->rs, sel);
2129         /* we need to create a spill var and insert a load to sel after the current instruction */
2130         MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
2131         load->dreg = sel;
2132         load->inst_basereg = cfg->frame_reg;
2133         load->inst_offset = mono_spillvar_offset (cfg, spill);
2134         if (item->prev) {
2135                 while (ins->next != item->prev->data)
2136                         ins = ins->next;
2137         }
2138         load->next = ins->next;
2139         ins->next = load;
2140         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2141         i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
2142         g_assert (i == sel);
2143
2144         return sel;
2145 }
2146
2147 /*========================= End of Function ========================*/
2148
2149 /*------------------------------------------------------------------*/
2150 /*                                                                  */
2151 /* Name         - get_float_register_spilling                       */
2152 /*                                                                  */
2153 /* Function     -                                                   */
2154 /*                                                                  */
2155 /*------------------------------------------------------------------*/
2156
2157 static int
2158 get_float_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
2159 {
2160         MonoInst *load;
2161         int i, sel, spill;
2162
2163         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));
2164         /* exclude the registers in the current instruction */
2165         if (reg != ins->sreg1 &&
2166             (freg_is_freeable (ins->sreg1) ||
2167              (ins->sreg1 >= MONO_MAX_FREGS &&
2168               cfg->rs->fassign [ins->sreg1] >= 0))) {
2169                 if (ins->sreg1 >= MONO_MAX_FREGS)
2170                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg1]);
2171                 else
2172                         regmask &= ~ (1 << ins->sreg1);
2173                 DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
2174         }
2175         if (reg != ins->sreg2 &&
2176             (freg_is_freeable (ins->sreg2) ||
2177              (ins->sreg2 >= MONO_MAX_FREGS &&
2178               cfg->rs->fassign [ins->sreg2] >= 0))) {
2179                 if (ins->sreg2 >= MONO_MAX_FREGS)
2180                         regmask &= ~ (1 << cfg->rs->fassign [ins->sreg2]);
2181                 else
2182                         regmask &= ~ (1 << ins->sreg2);
2183                 DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
2184         }
2185         if (reg != ins->dreg && freg_is_freeable (ins->dreg)) {
2186                 regmask &= ~ (1 << ins->dreg);
2187                 DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
2188         }
2189
2190         DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
2191         g_assert (regmask); /* need at least a register we can free */
2192         sel = -1;
2193         /* we should track prev_use and spill the register that's farther */
2194         for (i = 0; i < MONO_MAX_FREGS; ++i) {
2195                 if (regmask & (1 << i)) {
2196                         sel = i;
2197                         DEBUG (g_print ("selected register %s has assignment %d\n",
2198                                         mono_arch_regname (sel), cfg->rs->fassign [sel]));
2199                         break;
2200                 }
2201         }
2202         i = cfg->rs->fsymbolic [sel];
2203         spill = ++cfg->spill_count;
2204         cfg->rs->fassign [i] = -spill - 1;
2205         mono_regstate_free_float(cfg->rs, sel);
2206         /* we need to create a spill var and insert a load to sel after the current instruction */
2207         MONO_INST_NEW (cfg, load, OP_LOADR8_MEMBASE);
2208         load->dreg = sel;
2209         load->inst_basereg = cfg->frame_reg;
2210         load->inst_offset = mono_spillvar_offset_float (cfg, spill);
2211         if (item->prev) {
2212                 while (ins->next != item->prev->data)
2213                         ins = ins->next;
2214         }
2215         load->next = ins->next;
2216         ins->next = load;
2217         DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
2218         i = mono_regstate_alloc_float (cfg->rs, 1 << sel);
2219         g_assert (i == sel);
2220
2221         return sel;
2222 }
2223
2224 /*========================= End of Function ========================*/
2225
2226 /*------------------------------------------------------------------*/
2227 /*                                                                  */
2228 /* Name         - create_copy_ins                                   */
2229 /*                                                                  */
2230 /* Function     - Create an instruction to copy from reg to reg.    */
2231 /*                                                                  */
2232 /*------------------------------------------------------------------*/
2233
2234 static MonoInst*
2235 create_copy_ins (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2236 {
2237         MonoInst *copy;
2238         MONO_INST_NEW (cfg, copy, OP_MOVE);
2239         copy->dreg = dest;
2240         copy->sreg1 = src;
2241         if (ins) {
2242                 copy->next = ins->next;
2243                 ins->next = copy;
2244         }
2245         DEBUG (g_print ("\tforced copy from %s to %s\n",
2246                         mono_arch_regname (src), mono_arch_regname (dest)));
2247         return copy;
2248 }
2249
2250 /*========================= End of Function ========================*/
2251
2252 /*------------------------------------------------------------------*/
2253 /*                                                                  */
2254 /* Name         - create_copy_ins_float                             */
2255 /*                                                                  */
2256 /* Function     - Create an instruction to copy from float reg to   */
2257 /*                float reg.                                        */
2258 /*                                                                  */
2259 /*------------------------------------------------------------------*/
2260
2261 static MonoInst*
2262 create_copy_ins_float (MonoCompile *cfg, int dest, int src, MonoInst *ins)
2263 {
2264         MonoInst *copy;
2265         MONO_INST_NEW (cfg, copy, OP_FMOVE);
2266         copy->dreg = dest;
2267         copy->sreg1 = src;
2268         if (ins) {
2269                 copy->next = ins->next;
2270                 ins->next = copy;
2271         }
2272         DEBUG (g_print ("\tforced copy from %s to %s\n",
2273                         mono_arch_regname (src), mono_arch_regname (dest)));
2274         return copy;
2275 }
2276
2277 /*========================= End of Function ========================*/
2278
2279 /*------------------------------------------------------------------*/
2280 /*                                                                  */
2281 /* Name         - create_spilled_store                              */
2282 /*                                                                  */
2283 /* Function     - Spill register to storage.                        */
2284 /*                                                                  */
2285 /*------------------------------------------------------------------*/
2286
2287 static MonoInst*
2288 create_spilled_store (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2289 {
2290         MonoInst *store;
2291         MONO_INST_NEW (cfg, store, OP_STORE_MEMBASE_REG);
2292         store->sreg1 = reg;
2293         store->inst_destbasereg = cfg->frame_reg;
2294         store->inst_offset = mono_spillvar_offset (cfg, spill);
2295         if (ins) {
2296                 store->next = ins->next;
2297                 ins->next = store;
2298         }
2299         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2300                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2301         return store;
2302 }
2303
2304 /*========================= End of Function ========================*/
2305
2306 /*------------------------------------------------------------------*/
2307 /*                                                                  */
2308 /* Name         - create_spilled_store_float                        */
2309 /*                                                                  */
2310 /* Function     - Spill floating point register to storage.         */
2311 /*                                                                  */
2312 /*------------------------------------------------------------------*/
2313
2314 static MonoInst*
2315 create_spilled_store_float (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
2316 {
2317         MonoInst *store;
2318         MONO_INST_NEW (cfg, store, OP_STORER8_MEMBASE_REG);
2319         store->sreg1 = reg;
2320         store->inst_destbasereg = cfg->frame_reg;
2321         store->inst_offset = mono_spillvar_offset_float (cfg, spill);
2322         if (ins) {
2323                 store->next = ins->next;
2324                 ins->next = store;
2325         }
2326         DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n",
2327                         spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
2328         return store;
2329 }
2330
2331 /*========================= End of Function ========================*/
2332
2333 /*------------------------------------------------------------------*/
2334 /*                                                                  */
2335 /* Name         - insert_before_ins                                 */
2336 /*                                                                  */
2337 /* Function     - Insert an instruction before another.             */
2338 /*                                                                  */
2339 /*------------------------------------------------------------------*/
2340
2341 static void
2342 insert_before_ins (MonoInst *ins, InstList *item, MonoInst* to_insert)
2343 {
2344         MonoInst *prev;
2345         g_assert (item->next);
2346         prev = item->next->data;
2347
2348         while (prev->next != ins)
2349                 prev = prev->next;
2350         to_insert->next = ins;
2351         prev->next = to_insert;
2352         /*
2353          * needed otherwise in the next instruction we can add an ins to the
2354          * end and that would get past this instruction.
2355          */
2356         item->data = to_insert;
2357 }
2358
2359 /*========================= End of Function ========================*/
2360
2361 /*------------------------------------------------------------------*/
2362 /*                                                                  */
2363 /* Name         - alloc_int_reg                                     */
2364 /*                                                                  */
2365 /* Function     - Allocate a general register.                      */
2366 /*                                                                  */
2367 /*------------------------------------------------------------------*/
2368
2369 static int
2370 alloc_int_reg (MonoCompile *cfg, InstList *curinst, MonoInst *ins, int sym_reg, guint32 allow_mask)
2371 {
2372         int val = cfg->rs->iassign [sym_reg];
2373         if (val < 0) {
2374                 int spill = 0;
2375                 if (val < -1) {
2376                         /* the register gets spilled after this inst */
2377                         spill = -val -1;
2378                 }
2379                 val = mono_regstate_alloc_int (cfg->rs, allow_mask);
2380                 if (val < 0)
2381                         val = get_register_spilling (cfg, curinst, ins, allow_mask, sym_reg);
2382                 cfg->rs->iassign [sym_reg] = val;
2383                 /* add option to store before the instruction for src registers */
2384                 if (spill)
2385                         create_spilled_store (cfg, spill, val, sym_reg, ins);
2386         }
2387         cfg->rs->isymbolic [val] = sym_reg;
2388         return val;
2389 }
2390
2391 /*========================= End of Function ========================*/
2392
2393 /*------------------------------------------------------------------*/
2394 /*                                                                  */
2395 /* Name         - mono_arch_local_regalloc.                         */
2396 /*                                                                  */
2397 /* Function     - We first scan the list of instructions and we     */
2398 /*                save the liveness information of each register    */
2399 /*                (when the register is first used, when its value  */
2400 /*                is set etc.). We also reverse the list of instr-  */
2401 /*                uctions (in the InstList list) because assigning  */
2402 /*                registers backwards allows for more tricks to be  */
2403 /*                used.                                             */
2404 /*                                                                  */
2405 /*------------------------------------------------------------------*/
2406
2407 void
2408 mono_arch_local_regalloc (MonoCompile *cfg, MonoBasicBlock *bb)
2409 {
2410         MonoInst *ins;
2411         MonoRegState *rs = cfg->rs;
2412         int i, val;
2413         RegTrack *reginfo, *reginfof;
2414         RegTrack *reginfo1, *reginfo2, *reginfod;
2415         InstList *tmp, *reversed = NULL;
2416         const char *spec;
2417         guint32 src1_mask, src2_mask, dest_mask;
2418         guint32 cur_iregs, cur_fregs;
2419
2420         if (!bb->code)
2421                 return;
2422         rs->next_vireg = bb->max_ireg;
2423         rs->next_vfreg = bb->max_freg;
2424         mono_regstate_assign (rs);
2425         reginfo = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vireg);
2426         reginfof = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vfreg);
2427         rs->ifree_mask = S390_CALLER_REGS;
2428         rs->ffree_mask = S390_CALLER_FREGS;
2429
2430         ins = bb->code;
2431         i = 1;
2432         DEBUG (g_print ("LOCAL regalloc: basic block: %d\n", bb->block_num));
2433         /* forward pass on the instructions to collect register liveness info */
2434         while (ins) {
2435                 spec = ins_spec [ins->opcode];
2436                 DEBUG (print_ins (i, ins));
2437                 if (spec [MONO_INST_CLOB] == 'c') {
2438                         MonoCallInst * call = (MonoCallInst*)ins;
2439                         int j;
2440                 }
2441                 if (spec [MONO_INST_SRC1]) {
2442                         if (spec [MONO_INST_SRC1] == 'f')
2443                                 reginfo1 = reginfof;
2444                         else
2445                                 reginfo1 = reginfo;
2446                         reginfo1 [ins->sreg1].prev_use = reginfo1 [ins->sreg1].last_use;
2447                         reginfo1 [ins->sreg1].last_use = i;
2448                 } else {
2449                         ins->sreg1 = -1;
2450                 }
2451                 if (spec [MONO_INST_SRC2]) {
2452                         if (spec [MONO_INST_SRC2] == 'f')
2453                                 reginfo2 = reginfof;
2454                         else
2455                                 reginfo2 = reginfo;
2456                         reginfo2 [ins->sreg2].prev_use = reginfo2 [ins->sreg2].last_use;
2457                         reginfo2 [ins->sreg2].last_use = i;
2458                 } else {
2459                         ins->sreg2 = -1;
2460                 }
2461                 if (spec [MONO_INST_DEST]) {
2462                         if (spec [MONO_INST_DEST] == 'f')
2463                                 reginfod = reginfof;
2464                         else
2465                                 reginfod = reginfo;
2466                         if (spec [MONO_INST_DEST] != 'b') /* it's not just a base register */
2467                                 reginfod [ins->dreg].killed_in = i;
2468                         reginfod [ins->dreg].prev_use = reginfod [ins->dreg].last_use;
2469                         reginfod [ins->dreg].last_use = i;
2470                         if (reginfod [ins->dreg].born_in == 0 || reginfod [ins->dreg].born_in > i)
2471                                 reginfod [ins->dreg].born_in = i;
2472                         if (spec [MONO_INST_DEST] == 'l') {
2473                                 /* result in eax:edx, the virtual register is allocated sequentially */
2474                                 reginfod [ins->dreg + 1].prev_use = reginfod [ins->dreg + 1].last_use;
2475                                 reginfod [ins->dreg + 1].last_use = i;
2476                                 if (reginfod [ins->dreg + 1].born_in == 0 || reginfod [ins->dreg + 1].born_in > i)
2477                                         reginfod [ins->dreg + 1].born_in = i;
2478                         }
2479                 } else {
2480                         ins->dreg = -1;
2481                 }
2482                 reversed = inst_list_prepend (cfg->mempool, reversed, ins);
2483                 ++i;
2484                 ins = ins->next;
2485         }
2486
2487         cur_iregs = S390_CALLER_REGS;
2488         cur_fregs = S390_CALLER_FREGS;
2489
2490         DEBUG (print_regtrack (reginfo, rs->next_vireg));
2491         DEBUG (print_regtrack (reginfof, rs->next_vfreg));
2492         tmp = reversed;
2493         while (tmp) {
2494                 int prev_dreg, prev_sreg1, prev_sreg2;
2495                 --i;
2496                 ins = tmp->data;
2497                 spec = ins_spec [ins->opcode];
2498                 DEBUG (g_print ("processing:"));
2499                 DEBUG (print_ins (i, ins));
2500                 /* make the register available for allocation: FIXME add fp reg */
2501                 if (ins->opcode == OP_SETREG || ins->opcode == OP_SETREGIMM) {
2502                         cur_iregs |= 1 << ins->dreg;
2503                         DEBUG (g_print ("adding %d to cur_iregs\n", ins->dreg));
2504                 } else if (ins->opcode == OP_SETFREG) {
2505                         cur_fregs |= 1 << ins->dreg;
2506                         DEBUG (g_print ("adding %d to cur_fregs\n", ins->dreg));
2507                 } else if (spec [MONO_INST_CLOB] == 'c') {
2508                         MonoCallInst *cinst = (MonoCallInst*)ins;
2509                         DEBUG (g_print ("excluding regs 0x%x from cur_iregs (0x%x)\n", cinst->used_iregs, cur_iregs));
2510                         cur_iregs &= ~cinst->used_iregs;
2511                         cur_fregs &= ~cinst->used_fregs;
2512                         DEBUG (g_print ("available cur_iregs: 0x%x\n", cur_iregs));
2513                         /* registers used by the calling convention are excluded from
2514                          * allocation: they will be selectively enabled when they are
2515                          * assigned by the special SETREG opcodes.
2516                          */
2517                 }
2518                 dest_mask = src1_mask = src2_mask = cur_iregs;
2519                 /* update for use with FP regs... */
2520                 if (spec [MONO_INST_DEST] == 'f') {
2521                         if (ins->dreg >= MONO_MAX_FREGS) {
2522                                 val = rs->fassign [ins->dreg];
2523                                 prev_dreg = ins->dreg;
2524                                 if (val < 0) {
2525                                         int spill = 0;
2526                                         if (val < -1) {
2527                                                 /* the register gets spilled after this inst */
2528                                                 spill = -val -1;
2529                                         }
2530                                         val = mono_regstate_alloc_float (rs, dest_mask);
2531                                         if (val < 0)
2532                                                 val = get_float_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2533                                         rs->fassign [ins->dreg] = val;
2534                                         if (spill)
2535                                                 create_spilled_store_float (cfg, spill, val, prev_dreg, ins);
2536                                 }
2537                                 DEBUG (g_print ("\tassigned dreg %s to dest R%d\n", mono_arch_regname (val), ins->dreg));
2538                                 rs->fsymbolic [val] = prev_dreg;
2539                                 ins->dreg = val;
2540                                 if (spec [MONO_INST_CLOB] == 'c' && ins->dreg != s390_f0) {
2541                                         /* this instruction only outputs to s390_f0, need to copy */
2542                                         create_copy_ins_float (cfg, ins->dreg, s390_f0, ins);
2543                                 }
2544                         } else {
2545                                 prev_dreg = -1;
2546                         }
2547                         if (freg_is_freeable (ins->dreg) && prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i || !(cur_fregs & (1 << ins->dreg)))) {
2548                                 DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2549                                 mono_regstate_free_float (rs, ins->dreg);
2550                         }
2551                 } else if (ins->dreg >= MONO_MAX_IREGS) {
2552                         val = rs->iassign [ins->dreg];
2553                         prev_dreg = ins->dreg;
2554                         if (val < 0) {
2555                                 int spill = 0;
2556                                 if (val < -1) {
2557                                         /* the register gets spilled after this inst */
2558                                         spill = -val -1;
2559                                 }
2560                                 val = mono_regstate_alloc_int (rs, dest_mask);
2561                                 if (val < 0)
2562                                         val = get_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
2563                                 rs->iassign [ins->dreg] = val;
2564                                 if (spill)
2565                                         create_spilled_store (cfg, spill, val, prev_dreg, ins);
2566                         }
2567                         DEBUG (g_print ("\tassigned dreg %s to dest R%d\n", mono_arch_regname (val), ins->dreg));
2568                         rs->isymbolic [val] = prev_dreg;
2569                         ins->dreg = val;
2570                         if (spec [MONO_INST_DEST] == 'l') {
2571                                 int hreg = prev_dreg + 1;
2572                                 val = rs->iassign [hreg];
2573                                 if (val < 0) {
2574                                         int spill = 0;
2575                                         if (val < -1) {
2576                                                 /* the register gets spilled after this inst */
2577                                                 spill = -val -1;
2578                                         }
2579                                         val = mono_regstate_alloc_int (rs, dest_mask);
2580                                         if (val < 0)
2581                                                 val = get_register_spilling (cfg, tmp, ins, dest_mask, hreg);
2582                                         rs->iassign [hreg] = val;
2583                                         if (spill)
2584                                                 create_spilled_store (cfg, spill, val, hreg, ins);
2585                                 }
2586                                 DEBUG (g_print ("\tassigned hreg %s to dest R%d\n", mono_arch_regname (val), hreg));
2587                                 rs->isymbolic [val] = hreg;
2588                                 /* FIXME:? ins->dreg = val; */
2589                                 if (ins->dreg == s390_r3) {
2590                                         if (val != s390_r2)
2591                                                 create_copy_ins (cfg, val, s390_r2, ins);
2592                                 } else if (ins->dreg == s390_r2) {
2593                                         if (val == s390_r3) {
2594                                                 /* swap */
2595                                                 create_copy_ins (cfg, s390_r3, s390_r0, ins);
2596                                                 create_copy_ins (cfg, s390_r2, s390_r3, ins);
2597                                                 create_copy_ins (cfg, s390_r0, s390_r2, ins);
2598                                         } else {
2599                                                 /* two forced copies */
2600                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2601                                                 create_copy_ins (cfg, val, s390_r2, ins);
2602                                         }
2603                                 } else {
2604                                         if (val == s390_r2) {
2605                                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2606                                         } else {
2607                                                 /* two forced copies */
2608                                                 create_copy_ins (cfg, val, s390_r2, ins);
2609                                                 create_copy_ins (cfg, ins->dreg, s390_r3, ins);
2610                                         }
2611                                 }
2612                                 if (reg_is_freeable (val) && hreg >= 0 && (reginfo [hreg].born_in >= i && !(cur_iregs & (1 << val)))) {
2613                                         DEBUG (g_print ("\tfreeable %s (R%d)\n", mono_arch_regname (val), hreg));
2614                                         mono_regstate_free_int (rs, val);
2615                                 }
2616                         } else if (spec [MONO_INST_DEST] == 'a' && ins->dreg != s390_r2 && spec [MONO_INST_CLOB] != 'd') {
2617                                 /* this instruction only outputs to s390_r2, need to copy */
2618                                 create_copy_ins (cfg, ins->dreg, s390_r2, ins);
2619                         }
2620                 } else {
2621                         prev_dreg = -1;
2622                 }
2623                 if (spec [MONO_INST_DEST] != 'f' && reg_is_freeable (ins->dreg) && prev_dreg >= 0 && (reginfo [prev_dreg].born_in >= i)) {
2624                         DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
2625                         mono_regstate_free_int (rs, ins->dreg);
2626                 }
2627                 if (spec [MONO_INST_SRC1] == 'f') {
2628                         if (ins->sreg1 >= MONO_MAX_FREGS) {
2629                                 val = rs->fassign [ins->sreg1];
2630                                 prev_sreg1 = ins->sreg1;
2631                                 if (val < 0) {
2632                                         int spill = 0;
2633                                         if (val < -1) {
2634                                                 /* the register gets spilled after this inst */
2635                                                 spill = -val -1;
2636                                         }
2637                                         //g_assert (val == -1); /* source cannot be spilled */
2638                                         val = mono_regstate_alloc_float (rs, src1_mask);
2639                                         if (val < 0)
2640                                                 val = get_float_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2641                                         rs->fassign [ins->sreg1] = val;
2642                                         DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2643                                         if (spill) {
2644                                                 MonoInst *store = create_spilled_store_float (cfg, spill, val, prev_sreg1, NULL);
2645                                                 insert_before_ins (ins, tmp, store);
2646                                         }
2647                                 }
2648                                 rs->fsymbolic [val] = prev_sreg1;
2649                                 ins->sreg1 = val;
2650                         } else {
2651                                 prev_sreg1 = -1;
2652                         }
2653                 } else if (ins->sreg1 >= MONO_MAX_IREGS) {
2654                         val = rs->iassign [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                                 if (0 && ins->opcode == OP_MOVE) {
2663                                         /*
2664                                          * small optimization: the dest register is already allocated
2665                                          * but the src one is not: we can simply assign the same register
2666                                          * here and peephole will get rid of the instruction later.
2667                                          * This optimization may interfere with the clobbering handling:
2668                                          * it removes a mov operation that will be added again to handle clobbering.
2669                                          * There are also some other issues that should with make testjit.
2670                                          */
2671                                         mono_regstate_alloc_int (rs, 1 << ins->dreg);
2672                                         val = rs->iassign [ins->sreg1] = ins->dreg;
2673                                         //g_assert (val >= 0);
2674                                         DEBUG (g_print ("\tfast assigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2675                                 } else {
2676                                         //g_assert (val == -1); /* source cannot be spilled */
2677                                         val = mono_regstate_alloc_int (rs, src1_mask);
2678                                         if (val < 0)
2679                                                 val = get_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
2680                                         rs->iassign [ins->sreg1] = val;
2681                                         DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
2682                                 }
2683                                 if (spill) {
2684                                         MonoInst *store = create_spilled_store (cfg, spill, val, prev_sreg1, NULL);
2685                                         insert_before_ins (ins, tmp, store);
2686                                 }
2687                         }
2688                         rs->isymbolic [val] = prev_sreg1;
2689                         ins->sreg1 = val;
2690                 } else {
2691                         prev_sreg1 = -1;
2692                 }
2693                 /*----------------------------------------------*/
2694                 /* handle clobbering of sreg1                   */
2695                 /*----------------------------------------------*/
2696                 if ((spec [MONO_INST_CLOB] == '1' ||
2697                      spec [MONO_INST_CLOB] == 's') &&
2698                     ins->dreg != ins->sreg1) {
2699                         MonoInst *copy = create_copy_ins (cfg, ins->dreg, ins->sreg1, NULL);
2700                         DEBUG (g_print ("\tneed to copy sreg1 %s to dreg %s\n",
2701                                         mono_arch_regname (ins->sreg1),
2702                                         mono_arch_regname (ins->dreg)));
2703                         if (ins->sreg2 == -1 || spec [MONO_INST_CLOB] == 's') {
2704                                 /* note: the copy is inserted before the current instruction! */
2705                                 insert_before_ins (ins, tmp, copy);
2706                                 /* we set sreg1 to dest as well */
2707                                 prev_sreg1 = ins->sreg1 = ins->dreg;
2708                         } else {
2709                                 /* inserted after the operation */
2710                                 copy->next = ins->next;
2711                                 ins->next  = copy;
2712                         }
2713                 }
2714
2715                 if (spec [MONO_INST_SRC2] == 'f') {
2716                         if (ins->sreg2 >= MONO_MAX_FREGS) {
2717                                 val = rs->fassign [ins->sreg2];
2718                                 prev_sreg2 = ins->sreg2;
2719                                 if (val < 0) {
2720                                         int spill = 0;
2721                                         if (val < -1) {
2722                                                 /* the register gets spilled after this inst */
2723                                                 spill = -val -1;
2724                                         }
2725                                         val = mono_regstate_alloc_float (rs, src2_mask);
2726                                         if (val < 0)
2727                                                 val = get_float_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2728                                         rs->fassign [ins->sreg2] = val;
2729                                         DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2730                                         if (spill)
2731                                                 create_spilled_store_float (cfg, spill, val, prev_sreg2, ins);
2732                                 }
2733                                 rs->fsymbolic [val] = prev_sreg2;
2734                                 ins->sreg2 = val;
2735                         } else {
2736                                 prev_sreg2 = -1;
2737                         }
2738                 } else if (ins->sreg2 >= MONO_MAX_IREGS) {
2739                         val = rs->iassign [ins->sreg2];
2740                         prev_sreg2 = ins->sreg2;
2741                         if (val < 0) {
2742                                 int spill = 0;
2743                                 if (val < -1) {
2744                                         /* the register gets spilled after this inst */
2745                                         spill = -val -1;
2746                                 }
2747                                 val = mono_regstate_alloc_int (rs, src2_mask);
2748                                 if (val < 0)
2749                                         val = get_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
2750                                 rs->iassign [ins->sreg2] = val;
2751                                 DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
2752                                 if (spill)
2753                                         create_spilled_store (cfg, spill, val, prev_sreg2, ins);
2754                         }
2755                         rs->isymbolic [val] = prev_sreg2;
2756                         ins->sreg2 = val;
2757                 } else {
2758                         prev_sreg2 = -1;
2759                 }
2760
2761                 if (spec [MONO_INST_CLOB] == 'c') {
2762                         int j, s;
2763                         guint32 clob_mask = S390_CALLER_REGS;
2764                         for (j = 0; j < MONO_MAX_IREGS; ++j) {
2765                                 s = 1 << j;
2766                                 if ((clob_mask & s) && !(rs->ifree_mask & s) && j != ins->sreg1) {
2767                                         //g_warning ("register %s busy at call site\n", mono_arch_regname (j));
2768                                 }
2769                         }
2770                 }
2771                 /*if (reg_is_freeable (ins->sreg1) && prev_sreg1 >= 0 && reginfo [prev_sreg1].born_in >= i) {
2772                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg1)));
2773                         mono_regstate_free_int (rs, ins->sreg1);
2774                 }
2775                 if (reg_is_freeable (ins->sreg2) && prev_sreg2 >= 0 && reginfo [prev_sreg2].born_in >= i) {
2776                         DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg2)));
2777                         mono_regstate_free_int (rs, ins->sreg2);
2778                 }*/
2779
2780                 //DEBUG (print_ins (i, ins));
2781                 tmp = tmp->next;
2782         }
2783 }
2784
2785 /*========================= End of Function ========================*/
2786
2787 /*------------------------------------------------------------------*/
2788 /*                                                                  */
2789 /* Name         - emit_float_to_int                                 */
2790 /*                                                                  */
2791 /* Function     - Create instructions which will convert a floating */
2792 /*                point value to integer.                           */
2793 /*                                                                  */
2794 /*------------------------------------------------------------------*/
2795
2796 static guchar*
2797 emit_float_to_int (MonoCompile *cfg, guchar *code, int dreg, int sreg, int size, gboolean is_signed)
2798 {
2799         /* sreg is a float, dreg is an integer reg. */
2800         if (is_signed) {
2801                 s390_cfdbr (code, dreg, 5, sreg);
2802         } else {
2803                 s390_basr   (code, s390_r13, 0);
2804                 s390_j      (code, 10);
2805                 s390_double (code, 0x41e0000000000000);
2806                 s390_double (code, 0x41f0000000000000);
2807                 s390_ldr    (code, s390_f0, sreg);
2808                 s390_cdb    (code, s390_f0, 0, s390_r13, 0);
2809                 s390_jl     (code, 10);
2810                 s390_sdb    (code, s390_f0, 0, s390_r13, 8);
2811                 s390_cfdbr  (code, dreg, 7, s390_f0);
2812                 s390_j      (code, 5);
2813                 s390_cfdbr  (code, dreg, 5, sreg);
2814         }
2815         return code;
2816 }
2817
2818 /*========================= End of Function ========================*/
2819
2820 /*------------------------------------------------------------------*/
2821 /*                                                                  */
2822 /* Name         - mono_emit_stack_alloc                             */
2823 /*                                                                  */
2824 /* Function     -                                                   */
2825 /*                                                                  */
2826 /*------------------------------------------------------------------*/
2827
2828 static unsigned char*
2829 mono_emit_stack_alloc (guchar *code, MonoInst* tree)
2830 {
2831         return code;
2832 }
2833
2834 /*========================= End of Function ========================*/
2835
2836 /*------------------------------------------------------------------*/
2837 /*                                                                  */
2838 /* Name         - mono_arch_output_basic_block                      */
2839 /*                                                                  */
2840 /* Function     - Perform the "real" work of emitting instructions  */
2841 /*                that will do the work of in the basic block.      */
2842 /*                                                                  */
2843 /*------------------------------------------------------------------*/
2844
2845 void
2846 mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
2847 {
2848         MonoInst *ins;
2849         MonoCallInst *call;
2850         guint offset;
2851         guint8 *code = cfg->native_code + cfg->code_len;
2852         MonoInst *last_ins = NULL;
2853         guint last_offset = 0;
2854         int max_len, cpos;
2855
2856         if (cfg->opt & MONO_OPT_PEEPHOLE)
2857                 peephole_pass (cfg, bb);
2858
2859         /* we don't align basic blocks of loops on s390 */
2860
2861         if (cfg->verbose_level > 2)
2862                 g_print ("Basic block %d starting at offset 0x%x\n", bb->block_num, bb->native_offset);
2863
2864         cpos = bb->max_offset;
2865
2866         if (cfg->prof_options & MONO_PROFILE_COVERAGE) {
2867                 //MonoCoverageInfo *cov = mono_get_coverage_info (cfg->method);
2868                 //g_assert (!mono_compile_aot);
2869                 //cpos += 6;
2870                 //if (bb->cil_code)
2871                 //      cov->data [bb->dfn].iloffset = bb->cil_code - cfg->cil_code;
2872                 /* this is not thread save, but good enough */
2873                 /* fixme: howto handle overflows? */
2874                 //x86_inc_mem (code, &cov->data [bb->dfn].count);
2875         }
2876
2877         ins = bb->code;
2878         while (ins) {
2879                 offset = code - cfg->native_code;
2880
2881                 max_len = ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
2882
2883                 if (offset > (cfg->code_size - max_len - 16)) {
2884                         cfg->code_size *= 2;
2885                         cfg->native_code = g_realloc (cfg->native_code, cfg->code_size);
2886                         code = cfg->native_code + offset;
2887                 }
2888
2889                 switch (ins->opcode) {
2890                 case OP_STOREI1_MEMBASE_IMM:
2891                         s390_lhi (code, s390_r14, ins->inst_imm);
2892                         if (s390_is_uimm12(ins->inst_offset))
2893                                 s390_stc (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2894                         else {
2895                                 s390_basr (code, s390_r13, 0);
2896                                 s390_j    (code, 4);
2897                                 s390_word (code, ins->inst_offset);
2898                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2899                                 s390_stc  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2900                         }
2901                         break;
2902                 case OP_STOREI2_MEMBASE_IMM:
2903                         s390_lhi (code, s390_r14, ins->inst_imm);
2904                         if (s390_is_uimm12(ins->inst_offset)) {
2905                                 s390_sth (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2906                         } else {
2907                                 s390_basr (code, s390_r14, 0);
2908                                 s390_j    (code, 4);
2909                                 s390_word (code, ins->inst_offset);
2910                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2911                                 s390_sth  (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2912                         }
2913                         break;
2914                 case OP_STORE_MEMBASE_IMM:
2915                 case OP_STOREI4_MEMBASE_IMM:
2916                         if (s390_is_imm16(ins->inst_imm)) {
2917                                 s390_lhi  (code, s390_r14, ins->inst_imm);
2918                         } else {
2919                                 s390_basr (code, s390_r13, 0);
2920                                 s390_j    (code, 4);
2921                                 s390_word (code, ins->inst_imm);
2922                                 s390_l    (code, s390_r14, 0, s390_r13, 4);
2923                         }
2924                         if (s390_is_uimm12(ins->inst_offset)) {
2925                                 s390_st  (code, s390_r14, 0, ins->inst_destbasereg, ins->inst_offset);
2926                         } else {
2927                                 s390_basr (code, s390_r13, 0);
2928                                 s390_j    (code, 4);
2929                                 s390_word (code, ins->inst_offset);
2930                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2931                                 s390_st   (code, s390_r14, s390_r13, ins->inst_destbasereg, 0);
2932                         }
2933                         break;
2934                 case OP_STOREI1_MEMBASE_REG:
2935                         if (s390_is_uimm12(ins->inst_offset)) {
2936                                 s390_stc  (code, ins->sreg1, 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_stc  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2943                         }
2944                         break;
2945                 case OP_STOREI2_MEMBASE_REG:
2946                         if (s390_is_uimm12(ins->inst_offset)) {
2947                                 s390_sth  (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_sth  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2954                         }
2955                         break;
2956                 case OP_STORE_MEMBASE_REG:
2957                 case OP_STOREI4_MEMBASE_REG:
2958                         if (s390_is_uimm12(ins->inst_offset)) {
2959                                 s390_st   (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
2960                         } else {
2961                                 s390_basr (code, s390_r13, 0);
2962                                 s390_j    (code, 4);
2963                                 s390_word (code, ins->inst_offset);
2964                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2965                                 s390_st   (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
2966                         }
2967                         break;
2968                 case CEE_LDIND_I:
2969                 case CEE_LDIND_I4:
2970                 case CEE_LDIND_U4:
2971                         s390_basr (code, s390_r13, 0);
2972                         s390_j    (code, 4);
2973                         s390_word (code, ins->inst_p0);
2974                         s390_l    (code, s390_r13, 0, s390_r13, 4);
2975                         s390_l    (code, ins->dreg, 0, s390_r13, 0);
2976                         break;
2977                 case OP_LOADU4_MEM:
2978                         g_assert_not_reached ();
2979                         break;
2980                 case OP_LOAD_MEMBASE:
2981                 case OP_LOADI4_MEMBASE:
2982                 case OP_LOADU4_MEMBASE:
2983                         if (s390_is_uimm12(ins->inst_offset))
2984                                 s390_l    (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
2985                         else {
2986                                 s390_basr (code, s390_r13, 0);
2987                                 s390_j    (code, 4);
2988                                 s390_word (code, ins->inst_offset);
2989                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
2990                                 s390_l    (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
2991                         }
2992                         break;
2993                 case OP_LOADU1_MEMBASE:
2994                         s390_lhi (code, s390_r0, 0);
2995                         if (s390_is_uimm12(ins->inst_offset))
2996                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
2997                         else {
2998                                 s390_basr (code, s390_r13, 0);
2999                                 s390_j    (code, 4);
3000                                 s390_word (code, ins->inst_offset);
3001                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3002                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3003                         }
3004                         s390_lr   (code, ins->dreg, s390_r0);
3005                         break;
3006                 case OP_LOADI1_MEMBASE:
3007                         s390_lhi (code, s390_r0, 0);
3008                         if (s390_is_uimm12(ins->inst_offset))
3009                                 s390_ic   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3010                         else {
3011                                 s390_basr (code, s390_r13, 0);
3012                                 s390_j    (code, 4);
3013                                 s390_word (code, ins->inst_offset);
3014                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3015                                 s390_ic   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3016                         }
3017                         s390_lhi  (code, s390_r13, 0x80);
3018                         s390_nr   (code, s390_r13, s390_r0);
3019                         s390_jz   (code, 5);
3020                         s390_lhi  (code, s390_r13, 0xff00);
3021                         s390_or   (code, s390_r0, s390_r13);
3022                         s390_lr   (code, ins->dreg, s390_r0);
3023                         break;
3024                 case OP_LOADU2_MEMBASE:
3025                         s390_lhi (code, s390_r0, 0);
3026                         if (s390_is_uimm12(ins->inst_offset))
3027                                 s390_icm  (code, s390_r0, 3, ins->inst_basereg, ins->inst_offset);
3028                         else {
3029                                 s390_basr (code, s390_r13, 0);
3030                                 s390_j    (code, 4);
3031                                 s390_word (code, ins->inst_offset);
3032                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3033                                 s390_ar   (code, s390_r13, ins->inst_basereg);
3034                                 s390_icm  (code, s390_r0, 3, s390_r13, 0);
3035                         }
3036                         s390_lr  (code, ins->dreg, s390_r0);
3037                         break;
3038                 case OP_LOADI2_MEMBASE:
3039                         s390_lhi (code, s390_r0, 0);
3040                         if (s390_is_uimm12(ins->inst_offset))
3041                                 s390_lh   (code, s390_r0, 0, ins->inst_basereg, ins->inst_offset);
3042                         else {
3043                                 s390_basr (code, s390_r13, 0);
3044                                 s390_j    (code, 4);
3045                                 s390_word (code, ins->inst_offset);
3046                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3047                                 s390_lh   (code, s390_r0, s390_r13, ins->inst_basereg, 0);
3048                         }
3049                         s390_lr  (code, ins->dreg, s390_r0);
3050                         break;
3051                 case CEE_CONV_I1:
3052                         s390_lhi  (code, s390_r0, 0x80);
3053                         if (ins->dreg != ins->sreg1) {
3054                                 s390_lr   (code, ins->dreg, ins->sreg1);
3055                         }
3056                         s390_nr   (code, s390_r0, ins->sreg1);
3057                         s390_jl   (code, 9);
3058                         s390_lhi  (code, s390_r13, -1);
3059                         s390_sll  (code, s390_r13, 0, 8);
3060                         s390_or   (code, ins->dreg, s390_r13);
3061                         break;
3062                 case CEE_CONV_I2:
3063                         s390_lhi  (code, s390_r0, 0x80);
3064                         s390_lr   (code, ins->dreg, ins->sreg1);
3065                         s390_nr   (code, s390_r0, ins->sreg1);
3066                         s390_jl   (code, 9);
3067                         s390_lhi  (code, s390_r13, -1);
3068                         s390_sll  (code, s390_r13, 0, 16);
3069                         s390_or   (code, ins->dreg, s390_r13);
3070                         break;
3071                 case CEE_CONV_U1:
3072                         s390_lhi  (code, s390_r0, 0xff);
3073                         if (ins->dreg != ins->sreg1) {
3074                                 s390_lr   (code, ins->dreg, ins->sreg1);
3075                         }
3076                         s390_nr   (code, ins->dreg, s390_r0);
3077                         break;
3078                 case CEE_CONV_U2:
3079                         s390_lhi  (code, s390_r0, -1);
3080                         s390_sll  (code, s390_r0, 0, 16);
3081                         s390_srl  (code, s390_r0, 0, 16);
3082                         if (ins->dreg != ins->sreg1) {
3083                                 s390_lr   (code, ins->dreg, ins->sreg1);
3084                         }
3085                         s390_nr   (code, ins->dreg, s390_r0);
3086                         break;
3087                 case OP_COMPARE:
3088                         if ((ins->next) &&
3089                             ((ins->next->opcode >= CEE_BNE_UN) &&
3090                              (ins->next->opcode <= CEE_BLT_UN)))
3091                                 s390_clr  (code, ins->sreg1, ins->sreg2);
3092                         else
3093                                 s390_cr   (code, ins->sreg1, ins->sreg2);
3094                         break;
3095                 case OP_COMPARE_IMM:
3096                         if (s390_is_imm16 (ins->inst_imm)) {
3097                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3098                                 if ((ins->next) &&
3099                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3100                                     (ins->next->opcode <= CEE_BLT_UN)))
3101                                         s390_clr  (code, ins->sreg1, s390_r0);
3102                                 else
3103                                         s390_cr   (code, ins->sreg1, s390_r0);
3104                         }
3105                         else {
3106                                 s390_basr (code, s390_r13, 0);
3107                                 s390_j    (code, 4);
3108                                 s390_word (code, ins->inst_imm);
3109                                 if ((ins->next) &&
3110                                     ((ins->next->opcode >= CEE_BNE_UN) &&
3111                                     (ins->next->opcode <= CEE_BLT_UN)))
3112                                         s390_cl   (code, ins->sreg1, 0, s390_r13, 4);
3113                                 else
3114                                         s390_c    (code, ins->sreg1, 0, s390_r13, 4);
3115                         }
3116                         break;
3117                 case OP_X86_TEST_NULL:
3118                         s390_ltr (code, ins->sreg1, ins->sreg1);
3119                         break;
3120                 case CEE_BREAK:
3121                         s390_break (code);
3122                         break;
3123                 case OP_ADDCC:
3124                         if (ins->dreg != ins->sreg1) {
3125                                 s390_lr   (code, ins->dreg, ins->sreg1);
3126                         }
3127                         s390_alr  (code, ins->dreg, ins->sreg2);
3128                         break;
3129                 case CEE_ADD:
3130                         if (ins->dreg != ins->sreg1) {
3131                                 s390_lr   (code, ins->dreg, ins->sreg1);
3132                         }
3133                         s390_ar   (code, ins->dreg, ins->sreg2);
3134                         break;
3135                 case OP_ADC:
3136                         if (ins->dreg != ins->sreg1) {
3137                                 s390_lr   (code, ins->dreg, ins->sreg1);
3138                         }
3139                         s390_alcr (code, ins->dreg, ins->sreg2);
3140                         break;
3141                 case OP_ADD_IMM:
3142                         if ((ins->next) &&
3143                             (ins->next->opcode == OP_ADC_IMM)) {
3144                                 s390_basr (code, s390_r13, 0);
3145                                 s390_j    (code, 4);
3146                                 s390_word (code, ins->inst_imm);
3147                                 if (ins->dreg != ins->sreg1) {
3148                                         s390_lr   (code, ins->dreg, ins->sreg1);
3149                                 }
3150                                 s390_al   (code, ins->dreg, 0, s390_r13, 4);
3151                         } else {
3152                                 if (s390_is_imm16 (ins->inst_imm)) {
3153                                         if (ins->dreg != ins->sreg1) {
3154                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3155                                         }
3156                                         s390_ahi (code, ins->dreg, ins->inst_imm);
3157                                 } else {
3158                                         s390_basr (code, s390_r13, 0);
3159                                         s390_j    (code, 4);
3160                                         s390_word (code, ins->inst_imm);
3161                                         if (ins->dreg != ins->sreg1) {
3162                                                 s390_lr   (code, ins->dreg, ins->sreg1);
3163                                         }
3164                                         s390_a    (code, ins->dreg, 0, s390_r13, 4);
3165                                 }
3166                         }
3167                         break;
3168                 case OP_ADC_IMM:
3169                         if (s390_is_imm16 (ins->inst_imm)) {
3170                                 if (ins->dreg != ins->sreg1) {
3171                                         s390_lr   (code, ins->dreg, ins->sreg1);
3172                                 }
3173                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3174                                 s390_alcr (code, ins->dreg, s390_r0);
3175                         } else {
3176                                 s390_basr (code, s390_r13, 0);
3177                                 s390_j    (code, 4);
3178                                 s390_word (code, ins->inst_imm);
3179                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3180                                 s390_alcr (code, ins->dreg, s390_r13);
3181                         }
3182                         break;
3183                 case OP_SUBCC:
3184                         if (ins->dreg != ins->sreg1) {
3185                                 s390_lr   (code, ins->dreg, ins->sreg1);
3186                         }
3187                         s390_sr (code, ins->dreg, ins->sreg2);
3188                         break;
3189                 case CEE_SUB:
3190                         if (ins->dreg != ins->sreg1) {
3191                                 s390_lr   (code, ins->dreg, ins->sreg1);
3192                         }
3193                         s390_sr   (code, ins->dreg, ins->sreg2);
3194                         break;
3195                 case OP_SBB:
3196                         if (ins->dreg != ins->sreg1) {
3197                                 s390_lr   (code, ins->dreg, ins->sreg1);
3198                         }
3199                         s390_slbr (code, ins->dreg, ins->sreg2);
3200                         break;
3201                 case OP_SUB_IMM:
3202                         if (s390_is_imm16 (-ins->inst_imm)) {
3203                                 if (ins->dreg != ins->sreg1) {
3204                                         s390_lr   (code, ins->dreg, ins->sreg1);
3205                                 }
3206                                 s390_ahi  (code, ins->dreg, -ins->inst_imm);
3207                         } else {
3208                                 s390_basr (code, s390_r13, 0);
3209                                 s390_j    (code, 4);
3210                                 s390_word (code, ins->inst_imm);
3211                                 if (ins->dreg != ins->sreg1) {
3212                                         s390_lr   (code, ins->dreg, ins->sreg1);
3213                                 }
3214                                 s390_s    (code, ins->dreg, 0, s390_r13, 4);
3215                         }
3216                         break;
3217                 case OP_SBB_IMM:
3218                         s390_basr (code, s390_r13, 0);
3219                         s390_j    (code, 4);
3220                         s390_word (code, ins->inst_imm);
3221                         s390_sl   (code, ins->dreg, 0, s390_r13, 4);
3222                         break;
3223                 case CEE_AND:
3224                         if (ins->sreg1 == ins->dreg) {
3225                                 s390_nr   (code, ins->dreg, ins->sreg2);
3226                         }
3227                         else {
3228                                 if (ins->sreg2 == ins->dreg) {
3229                                         s390_nr  (code, ins->dreg, ins->sreg1);
3230                                 }
3231                                 else {
3232                                         s390_lr  (code, ins->dreg, ins->sreg1);
3233                                         s390_nr  (code, ins->dreg, ins->sreg2);
3234                                 }
3235                         }
3236                         break;
3237                 case OP_AND_IMM:
3238                         if (s390_is_imm16 (ins->inst_imm)) {
3239                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3240                                 if (ins->dreg != ins->sreg1) {
3241                                         s390_lr   (code, ins->dreg, ins->sreg1);
3242                                 }
3243                                 s390_nr   (code, ins->dreg, s390_r0);
3244                         } else {
3245                                 s390_basr (code, s390_r13, 0);
3246                                 s390_j    (code, 4);
3247                                 s390_word (code, ins->inst_imm);
3248                                 if (ins->dreg != ins->sreg1) {
3249                                         s390_lr   (code, ins->dreg, ins->sreg1);
3250                                 }
3251                                 s390_n    (code, ins->dreg, 0, s390_r13, 4);
3252                         }
3253                         break;
3254                 case CEE_DIV:
3255                         s390_lr   (code, s390_r0, ins->sreg1);
3256                         s390_srda (code, s390_r0, 0, 32);
3257                         s390_dr   (code, s390_r0, ins->sreg2);
3258                         s390_lr   (code, ins->dreg, s390_r1);
3259                         break;
3260                 case CEE_DIV_UN:
3261                         s390_lr   (code, s390_r0, ins->sreg1);
3262                         s390_srdl (code, s390_r0, 0, 32);
3263                         s390_dlr  (code, s390_r0, ins->sreg2);
3264                         s390_lr   (code, ins->dreg, s390_r1);
3265                         break;
3266                 case OP_DIV_IMM:
3267                         if (s390_is_imm16 (ins->inst_imm)) {
3268                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3269                                 s390_lr   (code, s390_r0, ins->sreg1);
3270                         } else {
3271                                 s390_basr (code, s390_r13, 0);
3272                                 s390_j    (code, 4);
3273                                 s390_word (code, ins->inst_imm);
3274                                 s390_lr   (code, s390_r0, ins->sreg1);
3275                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3276                         }
3277                         s390_srda (code, s390_r0, 0, 32);
3278                         s390_dr   (code, s390_r0, ins->sreg2);
3279                         s390_lr   (code, ins->dreg, s390_r1);
3280                         break;
3281                 case CEE_REM:
3282                         s390_lr   (code, s390_r0, ins->sreg1);
3283                         s390_srda (code, s390_r0, 0, 32);
3284                         s390_dr   (code, s390_r0, ins->sreg2);
3285                         s390_lr   (code, ins->dreg, s390_r0);
3286                         break;
3287                 case CEE_REM_UN:
3288                         s390_lr   (code, s390_r0, ins->sreg1);
3289                         s390_srdl (code, s390_r0, 0, 32);
3290                         s390_dlr  (code, s390_r0, ins->sreg2);
3291                         s390_lr   (code, ins->dreg, s390_r0);
3292                         break;
3293                 case OP_REM_IMM:
3294                         if (s390_is_imm16 (ins->inst_imm)) {
3295                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3296                                 s390_lr   (code, s390_r0, ins->sreg1);
3297                         } else {
3298                                 s390_basr (code, s390_r13, 0);
3299                                 s390_j    (code, 4);
3300                                 s390_word (code, ins->inst_imm);
3301                                 s390_lr   (code, s390_r0, ins->sreg1);
3302                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3303                         }
3304                         s390_srda (code, s390_r0, 0, 32);
3305                         s390_dr   (code, s390_r0, ins->sreg2);
3306                         s390_lr   (code, ins->dreg, s390_r0);
3307                         break;
3308                 case CEE_OR:
3309                         if (ins->sreg1 == ins->dreg) {
3310                                 s390_or   (code, ins->dreg, ins->sreg2);
3311                         }
3312                         else {
3313                                 if (ins->sreg2 == ins->dreg) {
3314                                         s390_or  (code, ins->dreg, ins->sreg1);
3315                                 }
3316                                 else {
3317                                         s390_lr  (code, ins->dreg, ins->sreg1);
3318                                         s390_or  (code, ins->dreg, ins->sreg2);
3319                                 }
3320                         }
3321                         break;
3322                 case OP_OR_IMM:
3323                         if (s390_is_imm16 (ins->inst_imm)) {
3324                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3325                                 if (ins->dreg != ins->sreg1) {
3326                                         s390_lr   (code, ins->dreg, ins->sreg1);
3327                                 }
3328                                 s390_or   (code, ins->dreg, s390_r0);
3329                         } else {
3330                                 s390_bras (code, s390_r13, 4);
3331                                 s390_word (code, ins->inst_imm);
3332                                 if (ins->dreg != ins->sreg1) {
3333                                         s390_lr   (code, ins->dreg, ins->sreg1);
3334                                 }
3335                                 s390_o    (code, ins->dreg, 0, s390_r13, 0);
3336                         }
3337                         break;
3338                 case CEE_XOR:
3339                         if (ins->sreg1 == ins->dreg) {
3340                                 s390_xr   (code, ins->dreg, ins->sreg2);
3341                         }
3342                         else {
3343                                 if (ins->sreg2 == ins->dreg) {
3344                                         s390_xr  (code, ins->dreg, ins->sreg1);
3345                                 }
3346                                 else {
3347                                         s390_lr  (code, ins->dreg, ins->sreg1);
3348                                         s390_xr  (code, ins->dreg, ins->sreg2);
3349                                 }
3350                         }
3351                         break;
3352                 case OP_XOR_IMM:
3353                         if (s390_is_imm16 (ins->inst_imm)) {
3354                                 s390_lhi  (code, s390_r0, ins->inst_imm);
3355                                 if (ins->dreg != ins->sreg1) {
3356                                         s390_lr   (code, ins->dreg, ins->sreg1);
3357                                 }
3358                                 s390_xr   (code, ins->dreg, s390_r0);
3359                         } else {
3360                                 s390_basr (code, s390_r13, 0);
3361                                 s390_j    (code, 4);
3362                                 s390_word (code, ins->inst_imm);
3363                                 if (ins->dreg != ins->sreg1) {
3364                                         s390_lr   (code, ins->dreg, ins->sreg1);
3365                                 }
3366                                 s390_x    (code, ins->dreg, 0, s390_r13, 4);
3367                         }
3368                         break;
3369                 case CEE_SHL:
3370                         if (ins->sreg1 != ins->dreg) {
3371                                 s390_lr   (code, ins->dreg, ins->sreg1);
3372                         }
3373                         s390_sll  (code, ins->dreg, ins->sreg2, 0);
3374                         break;
3375                 case OP_SHL_IMM:
3376                         if (ins->sreg1 != ins->dreg) {
3377                                 s390_lr   (code, ins->dreg, ins->sreg1);
3378                         }
3379                         s390_sll  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3380                         break;
3381                 case CEE_SHR:
3382                         if (ins->sreg1 != ins->dreg) {
3383                                 s390_lr   (code, ins->dreg, ins->sreg1);
3384                         }
3385                         s390_sra  (code, ins->dreg, ins->sreg2, 0);
3386                         break;
3387                 case OP_SHR_IMM:
3388                         if (ins->sreg1 != ins->dreg) {
3389                                 s390_lr   (code, ins->dreg, ins->sreg1);
3390                         }
3391                         s390_sra  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3392                         break;
3393                 case OP_SHR_UN_IMM:
3394                         if (ins->sreg1 != ins->dreg) {
3395                                 s390_lr   (code, ins->dreg, ins->sreg1);
3396                         }
3397                         s390_srl  (code, ins->dreg, 0, (ins->inst_imm & 0x1f));
3398                         break;
3399                 case CEE_SHR_UN:
3400                         if (ins->sreg1 != ins->dreg) {
3401                                 s390_lr   (code, ins->dreg, ins->sreg1);
3402                         }
3403                         s390_srl  (code, ins->dreg, ins->sreg2, 0);
3404                         break;
3405                 case CEE_NOT:
3406                         if (ins->sreg1 != ins->dreg) {
3407                                 s390_lr   (code, ins->dreg, ins->sreg1);
3408                         }
3409                         s390_lhi (code, s390_r0, -1);
3410                         s390_xr  (code, ins->dreg, s390_r0);
3411                         break;
3412                 case CEE_NEG:
3413                         s390_lcr (code, ins->dreg, ins->sreg1);
3414                         break;
3415                 case CEE_MUL:
3416                         if (ins->sreg1 == ins->dreg) {
3417                                 s390_msr  (code, ins->dreg, ins->sreg2);
3418                         }
3419                         else {
3420                                 if (ins->sreg2 == ins->dreg) {
3421                                         s390_msr (code, ins->dreg, ins->sreg1);
3422                                 }
3423                                 else {
3424                                         s390_lr  (code, ins->dreg, ins->sreg1);
3425                                         s390_msr (code, ins->dreg, ins->sreg2);
3426                                 }
3427                         }
3428                         break;
3429                 case OP_MUL_IMM:
3430                         if (s390_is_imm16 (ins->inst_imm)) {
3431                                 s390_lhi  (code, s390_r13, ins->inst_imm);
3432                         } else {
3433                                 s390_basr (code, s390_r13, 0);
3434                                 s390_j    (code, 4);
3435                                 s390_word (code, ins->inst_imm);
3436                                 if (ins->dreg != ins->sreg1) {
3437                                         s390_lr   (code, ins->dreg, ins->sreg1);
3438                                 }
3439                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3440                         }
3441                         s390_msr  (code, ins->dreg, s390_r13);
3442                         break;
3443                 case CEE_MUL_OVF:
3444                         s390_lhi  (code, s390_r0, 0);
3445                         s390_lr   (code, s390_r1, ins->sreg1);
3446                         s390_mr   (code, s390_r0, ins->sreg2);
3447                         s390_ltr  (code, s390_r0, s390_r0);
3448                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3449                         s390_lr   (code, ins->dreg, s390_r1);
3450                         break;
3451                 case CEE_MUL_OVF_UN:
3452                         s390_lhi  (code, s390_r0, 0);
3453                         s390_lr   (code, s390_r1, ins->sreg1);
3454                         s390_mlr  (code, s390_r0, ins->sreg2);
3455                         s390_ltr  (code, s390_r0, s390_r0);
3456                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NZ, "OverflowException");
3457                         s390_lr   (code, ins->dreg, s390_r1);
3458                         break;
3459                 case OP_LMUL:
3460                         s390_l    (code, s390_r0, 0, ins->sreg1, 4);
3461                         s390_lr   (code, s390_r14, s390_r0);
3462                         s390_srda (code, s390_r0, 0, 32);
3463                         s390_m    (code, s390_r0, 0, ins->sreg2, 4);
3464                         s390_srl  (code, s390_r14, 0, 31);
3465                         s390_a    (code, s390_r14, 0, ins->sreg1, 0);
3466                         s390_l    (code, s390_r13, 0, ins->sreg2, 0);
3467                         s390_srl  (code, s390_r13, 0, 31);
3468                         s390_ms   (code, s390_r13, 0, ins->sreg1, 4);
3469                         s390_ar   (code, s390_r14, s390_r13);
3470                         s390_st   (code, s390_r14, 0, ins->dreg, 0);
3471                         s390_st   (code, s390_r1, 0, ins->dreg, 4);
3472                         break;
3473                 case OP_ICONST:
3474                 case OP_SETREGIMM:
3475                         if (s390_is_imm16(ins->inst_c0)) {
3476                                 s390_lhi  (code, ins->dreg, ins->inst_c0);
3477                         } else {
3478                                 s390_basr (code, s390_r13, 0);
3479                                 s390_j    (code, 4);
3480                                 s390_word (code, ins->inst_c0);
3481                                 s390_l    (code, ins->dreg, 0, s390_r13, 4);
3482                         }
3483                         break;
3484                 case OP_AOTCONST:
3485                         s390_basr (code, s390_r13, 0);
3486                         s390_j    (code, 4);
3487                         mono_add_patch_info (cfg, code - cfg->native_code,
3488                                 (MonoJumpInfoType)ins->inst_i1, ins->inst_p0);
3489                         s390_word (code, 0);
3490                         s390_l    (code,ins->dreg, 0, s390_r13, 4);
3491                         break;
3492                 case CEE_CONV_I4:
3493                 case CEE_CONV_U4:
3494                 case OP_MOVE:
3495                 case OP_SETREG:
3496                         if (ins->dreg != ins->sreg1) {
3497                                 s390_lr (code, ins->dreg, ins->sreg1);
3498                         }
3499                         break;
3500                 case OP_SETLRET: {
3501                         int saved = ins->sreg1;
3502                         if (ins->sreg1 == s390_r2) {
3503                                 s390_lr (code, s390_r0, ins->sreg1);
3504                                 saved = s390_r0;
3505                         }
3506                         if (ins->sreg2 != s390_r2)
3507                                 s390_lr (code, s390_r2, ins->sreg2);
3508                         if (saved != s390_r3)
3509                                 s390_lr (code, s390_r3, saved);
3510                         break;
3511                 }
3512                 case OP_SETFREG:
3513                 case OP_FMOVE:
3514                         if (ins->dreg != ins->sreg1) {
3515                                 s390_ldr   (code, ins->dreg, ins->sreg1);
3516                         }
3517                         break;
3518                 case OP_FCONV_TO_R4:
3519                         if (ins->dreg != ins->sreg1) {
3520                                 s390_ledbr (code, ins->dreg, ins->sreg1);
3521                         }
3522                         break;
3523                 case CEE_JMP:
3524                         g_assert_not_reached ();
3525                         break;
3526                 case OP_CHECK_THIS:
3527                         /* ensure ins->sreg1 is not NULL */
3528                         s390_icm (code, s390_r0, 15, ins->sreg1, 0);
3529                         break;
3530                 case OP_FCALL:
3531                 case OP_LCALL:
3532                 case OP_VCALL:
3533                 case OP_VOIDCALL:
3534                 case CEE_CALL:
3535                         call = (MonoCallInst*)ins;
3536                         if (ins->flags & MONO_INST_HAS_METHOD)
3537                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_METHOD, call->method);
3538                         else
3539                                 mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_ABS, call->fptr);
3540                         s390_brasl (code, s390_r14, 0);
3541                         break;
3542                 case OP_FCALL_REG:
3543                 case OP_LCALL_REG:
3544                 case OP_VCALL_REG:
3545                 case OP_VOIDCALL_REG:
3546                 case OP_CALL_REG:
3547                         s390_lr   (code, s390_r1, ins->sreg1);
3548                         s390_basr (code, s390_r14, s390_r1);
3549                         break;
3550                 case OP_FCALL_MEMBASE:
3551                 case OP_LCALL_MEMBASE:
3552                 case OP_VCALL_MEMBASE:
3553                 case OP_VOIDCALL_MEMBASE:
3554                 case OP_CALL_MEMBASE:
3555                         s390_l    (code, s390_r1, 0, ins->sreg1, ins->inst_offset);
3556                         s390_basr (code, s390_r14, s390_r1);
3557                         break;
3558                 case OP_OUTARG:
3559                         g_assert_not_reached ();
3560                         break;
3561                 case OP_LOCALLOC:
3562                         s390_lr   (code, s390_r1, ins->sreg1);
3563                         s390_ahi  (code, s390_r1, 14);
3564                         s390_srl  (code, s390_r1, 0, 3);
3565                         s390_sll  (code, s390_r1, 0, 3);
3566                         s390_l    (code, s390_r13, 0, STK_BASE, 0);
3567                         s390_lcr  (code, s390_r1, s390_r1);
3568                         s390_la   (code, STK_BASE, STK_BASE, s390_r1, 0);
3569                         s390_st   (code, s390_r13, 0, STK_BASE, 0);
3570                         s390_la   (code, ins->dreg, 0, STK_BASE, S390_MINIMAL_STACK_SIZE+7);
3571                         s390_srl  (code, ins->dreg, 0, 3);
3572                         s390_sll  (code, ins->dreg, 0, 3);
3573                         break;
3574                 case CEE_RET:
3575                         s390_br  (code, s390_r14);
3576                         break;
3577                 case CEE_THROW: {
3578                         s390_lr (code, s390_r2, ins->sreg1);
3579                         mono_add_patch_info (cfg, code-cfg->native_code, MONO_PATCH_INFO_INTERNAL_METHOD,
3580                                              (gpointer)"mono_arch_throw_exception");
3581                         s390_brasl (code, s390_r14, 0);
3582                         break;
3583                 }
3584                 case OP_START_HANDLER:
3585                         s390_lr   (code, s390_r0, s390_r14);
3586                         s390_st   (code, s390_r0, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3587                         break;
3588                 case OP_ENDFILTER:
3589                         if (ins->sreg1 != s390_r2)
3590                                 s390_lr (code, s390_r2, ins->sreg1);
3591                         s390_l   (code, STK_BASE, 0, STK_BASE, 0);
3592                         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
3593                         s390_br  (code, s390_r14);
3594                         break;
3595                 case CEE_ENDFINALLY:
3596 //                      s390_l   (code, STK_BASE, 0, STK_BASE, 0);
3597 //                      s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
3598                         s390_l   (code, s390_r14, 0, ins->inst_left->inst_basereg, ins->inst_left->inst_offset);
3599                         s390_br  (code, s390_r14);
3600                         break;
3601                 case OP_CALL_HANDLER:
3602                         mono_add_patch_info (cfg, code-cfg->native_code,
3603                                              MONO_PATCH_INFO_BB, ins->inst_target_bb);
3604                         s390_brasl (code, s390_r14, 0);
3605                         break;
3606                 case OP_LABEL:
3607                         ins->inst_c0 = code - cfg->native_code;
3608                         break;
3609                 case CEE_BR:
3610                         EMIT_UNCOND_BRANCH(ins);
3611                         break;
3612                 case OP_BR_REG:
3613                         s390_br  (code, ins->sreg1);
3614                         break;
3615                 case OP_CEQ:
3616                         s390_lhi (code, ins->dreg, 1);
3617                         s390_jz  (code, 4);
3618                         s390_lhi (code, ins->dreg, 0);
3619                         break;
3620                 case OP_CLT:
3621                         s390_lhi (code, ins->dreg, 1);
3622                         s390_jl  (code, 4);
3623                         s390_lhi (code, ins->dreg, 0);
3624                         break;
3625                 case OP_CLT_UN:
3626                         s390_lhi (code, ins->dreg, 1);
3627                         s390_jlo (code, 4);
3628                         s390_lhi (code, ins->dreg, 0);
3629                         break;
3630                 case OP_CGT:
3631                         s390_lhi (code, ins->dreg, 1);
3632                         s390_jh  (code, 4);
3633                         s390_lhi (code, ins->dreg, 0);
3634                         break;
3635                 case OP_CGT_UN:
3636                         s390_lhi (code, ins->dreg, 1);
3637                         s390_jho (code, 4);
3638                         s390_lhi (code, ins->dreg, 0);
3639                         break;
3640                 case OP_COND_EXC_EQ:
3641                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_EQ, ins->inst_p1);
3642                         break;
3643                 case OP_COND_EXC_NE_UN:
3644                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NE, ins->inst_p1);
3645                         break;
3646                 case OP_COND_EXC_LT:
3647                 case OP_COND_EXC_LT_UN:
3648                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LT, ins->inst_p1);
3649                         break;
3650                 case OP_COND_EXC_GT:
3651                 case OP_COND_EXC_GT_UN:
3652                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GT, ins->inst_p1);
3653                         break;
3654                 case OP_COND_EXC_GE:
3655                 case OP_COND_EXC_GE_UN:
3656                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_GE, ins->inst_p1);
3657                         break;
3658                 case OP_COND_EXC_LE:
3659                 case OP_COND_EXC_LE_UN:
3660                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_LE, ins->inst_p1);
3661                         break;
3662                 case OP_COND_EXC_OV:
3663                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_OV, ins->inst_p1);
3664                         break;
3665                 case OP_COND_EXC_NO:
3666                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NO, ins->inst_p1);
3667                         break;
3668                 case OP_COND_EXC_C:
3669                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_CY, ins->inst_p1);
3670                         break;
3671                 case OP_COND_EXC_NC:
3672                         EMIT_COND_SYSTEM_EXCEPTION (S390_CC_NC, ins->inst_p1);
3673                         break;
3674                 case CEE_BEQ:
3675                         EMIT_COND_BRANCH (ins, S390_CC_EQ);
3676                         break;
3677                 case CEE_BNE_UN:
3678                         EMIT_COND_BRANCH (ins, S390_CC_NE);
3679                         break;
3680                 case CEE_BLT:
3681                 case CEE_BLT_UN:
3682                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3683                         break;
3684                 case CEE_BGT:
3685                 case CEE_BGT_UN:
3686                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3687                         break;
3688                 case CEE_BGE:
3689                 case CEE_BGE_UN:
3690                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3691                         break;
3692                 case CEE_BLE:
3693                 case CEE_BLE_UN:
3694                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3695                         break;
3696
3697                 /* floating point opcodes */
3698                 case OP_R8CONST:
3699                         if (*((float *) ins->inst_p0) == 0) {
3700                                 s390_lzdr (code, ins->dreg);
3701                         } else {
3702                                 s390_basr  (code, s390_r13, 0);
3703                                 s390_j     (code, 4);
3704                                 s390_word  (code, ins->inst_p0);
3705                                 s390_l     (code, s390_r13, 0, s390_r13, 4);
3706                                 s390_ld    (code, ins->dreg, 0, s390_r13, 0);
3707                         }
3708                         break;
3709                 case OP_R4CONST:
3710                         if (*((float *) ins->inst_p0) == 0) {
3711                                 s390_lzer (code, ins->dreg);
3712                         } else {
3713                                 s390_basr (code, s390_r13, 0);
3714                                 s390_j    (code, 4);
3715                                 s390_word (code, ins->inst_p0);
3716                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3717                                 s390_le   (code, ins->dreg, 0, s390_r13, 0);
3718                                 s390_ldebr(code, ins->dreg, ins->dreg);
3719                         }
3720                         break;
3721                 case OP_STORER8_MEMBASE_REG:
3722                         if (s390_is_uimm12(ins->inst_offset)) {
3723                                 s390_std  (code, ins->sreg1, 0, ins->inst_destbasereg, ins->inst_offset);
3724                         } else {
3725                                 s390_basr (code, s390_r13, 0);
3726                                 s390_j    (code, 4);
3727                                 s390_word (code, ins->inst_offset);
3728                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3729                                 s390_std  (code, ins->sreg1, s390_r13, ins->inst_destbasereg, 0);
3730                         }
3731                         break;
3732                 case OP_LOADR8_MEMBASE:
3733                         if (s390_is_uimm12(ins->inst_offset)) {
3734                                 s390_ld   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3735                         } else {
3736                                 s390_basr (code, s390_r13, 0);
3737                                 s390_j    (code, 4);
3738                                 s390_word (code, ins->inst_offset);
3739                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3740                                 s390_ld   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3741                         }
3742                         break;
3743                 case OP_STORER4_MEMBASE_REG:
3744                         if (s390_is_uimm12(ins->inst_offset)) {
3745                                 s390_ledbr(code, s390_f0, ins->sreg1);
3746                                 s390_ste  (code, s390_f0, 0, ins->inst_destbasereg, ins->inst_offset);
3747                         } else {
3748                                 s390_basr (code, s390_r13, 0);
3749                                 s390_j    (code, 4);
3750                                 s390_word (code, ins->inst_offset);
3751                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3752                                 s390_ledbr(code, s390_f0, ins->sreg1);
3753                                 s390_ste  (code, s390_f0, s390_r13, ins->inst_destbasereg, 0);
3754                         }
3755                         break;
3756                 case OP_LOADR4_MEMBASE:
3757                         if (s390_is_uimm12(ins->inst_offset)) {
3758                                 s390_le   (code, ins->dreg, 0, ins->inst_basereg, ins->inst_offset);
3759                         } else {
3760                                 s390_basr (code, s390_r13, 0);
3761                                 s390_j    (code, 4);
3762                                 s390_word (code, ins->inst_offset);
3763                                 s390_l    (code, s390_r13, 0, s390_r13, 4);
3764                                 s390_le   (code, ins->dreg, s390_r13, ins->inst_basereg, 0);
3765                         }
3766                         s390_ldebr (code, ins->dreg, ins->dreg);
3767                         break;
3768                 case CEE_CONV_R_UN:
3769                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3770                         s390_ltr   (code, ins->sreg1, ins->sreg1);
3771                         s390_jnl   (code, 12);
3772                         s390_basr  (code, s390_r13, 0);
3773                         s390_j     (code, 6);
3774                         s390_word  (code, 0x41f00000);
3775                         s390_word  (code, 0);
3776                         s390_adb   (code, ins->dreg, 0, s390_r13, 4);
3777                         break;
3778                 case CEE_CONV_R4:
3779                         s390_cefbr (code, ins->dreg, ins->sreg1);
3780                         break;
3781                 case CEE_CONV_R8:
3782                         s390_cdfbr (code, ins->dreg, ins->sreg1);
3783                         break;
3784                 case OP_FCONV_TO_I1:
3785                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, TRUE);
3786                         break;
3787                 case OP_FCONV_TO_U1:
3788                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 1, FALSE);
3789                         break;
3790                 case OP_FCONV_TO_I2:
3791                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, TRUE);
3792                         break;
3793                 case OP_FCONV_TO_U2:
3794                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 2, FALSE);
3795                         break;
3796                 case OP_FCONV_TO_I4:
3797                 case OP_FCONV_TO_I:
3798                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, TRUE);
3799                         break;
3800                 case OP_FCONV_TO_U4:
3801                 case OP_FCONV_TO_U:
3802                         code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, FALSE);
3803                         break;
3804                 case OP_FCONV_TO_I8:
3805                 case OP_FCONV_TO_U8:
3806                         g_assert_not_reached ();
3807                         /* Implemented as helper calls */
3808                         break;
3809                 case OP_LCONV_TO_R_UN:
3810                         g_assert_not_reached ();
3811                         /* Implemented as helper calls */
3812                         break;
3813                 case OP_LCONV_TO_OVF_I: {
3814                         /* Valid ints: 0xffffffff:8000000 to 00000000:0x7f000000 */
3815                         short int *o[5];
3816                         s390_ltr  (code, ins->sreg1, ins->sreg1);
3817                         s390_jnl  (code, 0); CODEPTR(code, o[0]);
3818                         s390_ltr  (code, ins->sreg2, ins->sreg2);
3819                         s390_jnl  (code, 0); CODEPTR(code, o[1]);
3820                         s390_lhi  (code, s390_r13, -1);
3821                         s390_cr   (code, ins->sreg2, s390_r13);
3822                         s390_jnz  (code, 0); CODEPTR(code, o[2]);
3823                         if (ins->dreg != ins->sreg1)
3824                                 s390_lr   (code, ins->dreg, ins->sreg1);
3825                         s390_j    (code, 0); CODEPTR(code, o[3]);
3826                         PTRSLOT(code, o[0]);
3827                         s390_jz   (code, 0); CODEPTR(code, o[4]);
3828                         PTRSLOT(code, o[1]);
3829                         PTRSLOT(code, o[2]);
3830                         mono_add_patch_info (cfg, code - cfg->native_code,
3831                                              MONO_PATCH_INFO_EXC, "OverflowException");
3832                         s390_brasl (code, s390_r14, 0);
3833                         PTRSLOT(code, o[3]);
3834                         PTRSLOT(code, o[4]);
3835                         break;
3836                 }
3837                 case OP_SQRT:
3838                         s390_sqdbr (code, ins->dreg, ins->sreg1);
3839                         break;
3840                 case OP_FADD:
3841                         if (ins->dreg == ins->sreg1)
3842                                 s390_adbr (code, ins->dreg, ins->sreg2);
3843                         else {
3844                                 if (ins->dreg == ins->sreg2)
3845                                         s390_adbr (code, ins->dreg, ins->sreg1);
3846                                 else {
3847                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3848                                         s390_adbr (code, ins->dreg, ins->sreg2);
3849                                 }
3850                         }
3851                         break;
3852                 case OP_FSUB:
3853                         if (ins->dreg == ins->sreg1)
3854                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3855                         else {
3856                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3857                                 s390_sdbr (code, ins->dreg, ins->sreg2);
3858                         }
3859                         break;
3860                 case OP_FMUL:
3861                         if (ins->dreg == ins->sreg1)
3862                                 s390_mdbr (code, ins->dreg, ins->sreg2);
3863                         else {
3864                                 if (ins->dreg == ins->sreg2)
3865                                         s390_mdbr (code, ins->dreg, ins->sreg1);
3866                                 else {
3867                                         s390_ldr  (code, ins->dreg, ins->sreg1);
3868                                         s390_mdbr (code, ins->dreg, ins->sreg2);
3869                                 }
3870                         }
3871                         break;
3872                 case OP_FDIV:
3873                         if (ins->dreg == ins->sreg1)
3874                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3875                         else {
3876                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3877                                 s390_ddbr (code, ins->dreg, ins->sreg2);
3878                         }
3879                         break;
3880                 case OP_FNEG:
3881                         s390_lcdbr (code, ins->dreg, ins->sreg1);
3882                         break;
3883                 case OP_FREM:
3884                         if (ins->dreg != ins->sreg1) {
3885                                 s390_ldr  (code, ins->dreg, ins->sreg1);
3886                         }
3887                         s390_didbr (code, ins->dreg, ins->sreg2, 5, s390_f15);
3888                         break;
3889                 case OP_FCOMPARE:
3890                         s390_cdbr (code, ins->sreg1, ins->sreg2);
3891                         break;
3892                 case OP_FCEQ:
3893                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3894                         s390_lhi   (code, ins->dreg, 1);
3895                         s390_je    (code, 4);
3896                         s390_lhi   (code, ins->dreg, 0);
3897                         break;
3898                 case OP_FCLT:
3899                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3900                         s390_lhi   (code, ins->dreg, 1);
3901                         s390_jl    (code, 4);
3902                         s390_lhi   (code, ins->dreg, 0);
3903                         break;
3904                 case OP_FCLT_UN:
3905                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3906                         s390_lhi   (code, ins->dreg, 1);
3907                         s390_jlo   (code, 4);
3908                         s390_lhi   (code, ins->dreg, 0);
3909                         break;
3910                 case OP_FCGT:
3911                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3912                         s390_lhi   (code, ins->dreg, 1);
3913                         s390_jh    (code, 4);
3914                         s390_lhi   (code, ins->dreg, 0);
3915                         break;
3916                 case OP_FCGT_UN:
3917                         s390_cdbr  (code, ins->sreg1, ins->sreg2);
3918                         s390_lhi   (code, ins->dreg, 1);
3919                         s390_jho   (code, 4);
3920                         s390_lhi   (code, ins->dreg, 0);
3921                         break;
3922                 case OP_FBEQ:
3923                         EMIT_COND_BRANCH (ins, S390_CC_EQ|S390_CC_OV);
3924                         break;
3925                 case OP_FBNE_UN:
3926                         EMIT_COND_BRANCH (ins, S390_CC_NE|S390_CC_OV);
3927                         break;
3928                 case OP_FBLT:
3929                         EMIT_COND_BRANCH (ins, S390_CC_LT);
3930                         break;
3931                 case OP_FBLT_UN:
3932                         EMIT_COND_BRANCH (ins, S390_CC_LT|S390_CC_OV);
3933                         break;
3934                 case OP_FBGT:
3935                         EMIT_COND_BRANCH (ins, S390_CC_GT);
3936                         break;
3937                 case OP_FBGT_UN:
3938                         EMIT_COND_BRANCH (ins, S390_CC_GT|S390_CC_OV);
3939                         break;
3940                 case OP_FBGE:
3941                         EMIT_COND_BRANCH (ins, S390_CC_GE);
3942                         break;
3943                 case OP_FBGE_UN:
3944                         EMIT_COND_BRANCH (ins, S390_CC_GE|S390_CC_OV);
3945                         break;
3946                 case OP_FBLE:
3947                         EMIT_COND_BRANCH (ins, S390_CC_LE);
3948                         break;
3949                 case OP_FBLE_UN:
3950                         EMIT_COND_BRANCH (ins, S390_CC_LE|S390_CC_OV);
3951                         break;
3952                 case CEE_CKFINITE: {
3953                         short *o;
3954                         s390_lhi  (code, s390_r13, 0xfc0);
3955                         s390_tcdb (code, ins->sreg1, 0, s390_r13, 0);
3956                         s390_jz   (code, 0); CODEPTR(code, o);
3957                         mono_add_patch_info (cfg, code - cfg->native_code + 2,
3958                                              MONO_PATCH_INFO_EXC, "ArithmeticException");
3959                         s390_brasl (code, s390_r14,0);
3960                         PTRSLOT(code, o);
3961                         break;
3962                 }
3963                 default:
3964                         g_warning ("unknown opcode %s in %s()\n", mono_inst_name (ins->opcode), __FUNCTION__);
3965                         g_assert_not_reached ();
3966                 }
3967
3968                 if ((cfg->opt & MONO_OPT_BRANCH) && ((code - cfg->native_code - offset) > max_len)) {
3969                         g_warning ("wrong maximal instruction length of instruction %s (expected %d, got %d)",
3970                                    mono_inst_name (ins->opcode), max_len, code - cfg->native_code - offset);
3971                         g_assert_not_reached ();
3972                 }
3973
3974                 cpos += max_len;
3975
3976                 last_ins = ins;
3977                 last_offset = offset;
3978
3979                 ins = ins->next;
3980         }
3981
3982         cfg->code_len = code - cfg->native_code;
3983 }
3984
3985 /*========================= End of Function ========================*/
3986
3987 /*------------------------------------------------------------------*/
3988 /*                                                                  */
3989 /* Name         - mono_arch_register_lowlevel_calls                 */
3990 /*                                                                  */
3991 /* Function     - Register routines to help with --trace operation. */
3992 /*                                                                  */
3993 /*------------------------------------------------------------------*/
3994
3995 void
3996 mono_arch_register_lowlevel_calls (void)
3997 {
3998         mono_register_jit_icall (enter_method, "mono_enter_method", NULL, TRUE);
3999         mono_register_jit_icall (leave_method, "mono_leave_method", NULL, TRUE);
4000 }
4001
4002 /*========================= End of Function ========================*/
4003
4004 /*------------------------------------------------------------------*/
4005 /*                                                                  */
4006 /* Name         - mono_arch_patch_code                              */
4007 /*                                                                  */
4008 /* Function     - Process the patch data created during the         */
4009 /*                instruction build process. This resolves jumps,   */
4010 /*                calls, variables etc.                             */
4011 /*                                                                  */
4012 /*------------------------------------------------------------------*/
4013
4014 void
4015 mono_arch_patch_code (MonoMethod *method, MonoDomain *domain, guint8 *code, MonoJumpInfo *ji, gboolean run_cctors)
4016 {
4017         MonoJumpInfo *patch_info;
4018
4019         for (patch_info = ji; patch_info; patch_info = patch_info->next) {
4020                 unsigned char *ip = patch_info->ip.i + code;
4021                 gint32 target = 0;
4022
4023                 switch (patch_info->type) {
4024                 case MONO_PATCH_INFO_BB:
4025                         target = S390_RELATIVE((patch_info->data.bb->native_offset+code),
4026                                                ip);
4027                         ip    += 2;     /* Skip over op-code */
4028                         break;
4029                 case MONO_PATCH_INFO_ABS:
4030                         target = S390_RELATIVE(patch_info->data.target, ip);
4031                         ip    += 2;     /* Skip over op-code */
4032                         break;
4033                 case MONO_PATCH_INFO_LABEL:
4034                         target = S390_RELATIVE((patch_info->data.inst->inst_c0+code),ip);
4035                         ip    += 2;     /* Skip over op-code */
4036                         break;
4037                 case MONO_PATCH_INFO_IP:
4038                         target = ip;
4039                         continue;
4040                 case MONO_PATCH_INFO_METHOD_REL:
4041                         g_assert_not_reached ();
4042                         *((gpointer *)(ip)) = code + patch_info->data.offset;
4043                         continue;
4044                 case MONO_PATCH_INFO_INTERNAL_METHOD: {
4045                         MonoJitICallInfo *mi = mono_find_jit_icall_by_name (patch_info->data.name);
4046                         if (!mi) {
4047                                 g_warning ("unknown MONO_PATCH_INFO_INTERNAL_METHOD %s", patch_info->data.name);
4048                                 g_assert_not_reached ();
4049                         }
4050                         target = S390_RELATIVE(mono_icall_get_wrapper (mi), ip);
4051                         ip    += 2;     /* Skip over op-code */
4052                         break;
4053                 }
4054                 case MONO_PATCH_INFO_METHOD_JUMP:
4055                         g_assert_not_reached ();
4056                         break;
4057                 case MONO_PATCH_INFO_METHOD:
4058                         if (patch_info->data.method == method) {
4059                                 target = S390_RELATIVE(code, ip);
4060                         } else {
4061                                 /* get the trampoline to the method from the domain */
4062                                 target = S390_RELATIVE(mono_arch_create_jit_trampoline (patch_info->data.method), ip);
4063                                 target = mono_arch_create_jit_trampoline(patch_info->data.method);
4064                                 target = S390_RELATIVE(target, ip);
4065                         }
4066                         ip    += 2;     /* Skip over op-code */
4067                         break;
4068                 case MONO_PATCH_INFO_SWITCH: {
4069                         gpointer *table = (gpointer *)patch_info->data.target;
4070                         int i;
4071                         /*------------------------------------------------------*/
4072                         /* ip is pointing at the basr r13,0/j +4 instruction    */
4073                         /* the vtable value follows this (i.e. ip+6)            */
4074                         /*------------------------------------------------------*/
4075                         *((gconstpointer *)(ip+6)) = table;
4076
4077                         for (i = 0; i < patch_info->table_size; i++) {
4078                                 table [i] = (int)patch_info->data.table [i] + code;
4079                         }
4080                         continue;
4081                 }
4082                 case MONO_PATCH_INFO_METHODCONST:
4083                 case MONO_PATCH_INFO_CLASS:
4084                 case MONO_PATCH_INFO_IMAGE:
4085                 case MONO_PATCH_INFO_FIELD:
4086                         target = S390_RELATIVE(patch_info->data.target, ip);
4087                         continue;
4088                 case MONO_PATCH_INFO_R4:
4089                 case MONO_PATCH_INFO_R8:
4090                         g_assert_not_reached ();
4091                         *((gconstpointer *)(ip + 2)) = patch_info->data.target;
4092                         continue;
4093                 case MONO_PATCH_INFO_IID:
4094                         mono_class_init (patch_info->data.klass);
4095                         target = S390_RELATIVE(patch_info->data.klass->interface_id, ip);
4096                         continue;
4097                 case MONO_PATCH_INFO_VTABLE:
4098                         target = S390_RELATIVE(mono_class_vtable (domain, patch_info->data.klass),ip);
4099                         ip += 2;
4100                         continue;
4101                 case MONO_PATCH_INFO_CLASS_INIT:
4102                         target = S390_RELATIVE(mono_create_class_init_trampoline (mono_class_vtable (domain, patch_info->data.klass)), ip);
4103                         ip += 2;
4104                         break;
4105                 case MONO_PATCH_INFO_SFLDA: {
4106                         MonoVTable *vtable = mono_class_vtable (domain, patch_info->data.field->parent);
4107                         if (!vtable->initialized && !(vtable->klass->flags & TYPE_ATTRIBUTE_BEFORE_FIELD_INIT) && mono_class_needs_cctor_run (vtable->klass, method))
4108                                 /* Done by the generated code */
4109                                 ;
4110                         else {
4111                                 if (run_cctors)
4112                                         mono_runtime_class_init (vtable);
4113                         }
4114                         target = S390_RELATIVE((char*)vtable->data + patch_info->data.field->offset, ip);
4115                         ip += 2;
4116                         continue;
4117                 }
4118                 case MONO_PATCH_INFO_EXC_NAME:
4119                         *((gconstpointer *)(ip)) = patch_info->data.name;
4120                         continue;
4121                 case MONO_PATCH_INFO_LDSTR:
4122                         target = mono_ldstr (domain, patch_info->data.token->image,
4123                                              mono_metadata_token_index (patch_info->data.token->token));
4124                         continue;
4125                 case MONO_PATCH_INFO_TYPE_FROM_HANDLE: {
4126                         gpointer handle;
4127                         MonoClass *handle_class;
4128
4129                         handle = mono_ldtoken (patch_info->data.token->image,
4130                                                patch_info->data.token->token,
4131                                                &handle_class, NULL);
4132                         mono_class_init (handle_class);
4133                         mono_class_init (mono_class_from_mono_type (handle));
4134
4135                         target = handle;
4136                         continue;
4137                 }
4138                 case MONO_PATCH_INFO_LDTOKEN: {
4139                         gpointer handle;
4140                         MonoClass *handle_class;
4141
4142                         handle = mono_ldtoken (patch_info->data.token->image,
4143                                                patch_info->data.token->token,
4144                                                &handle_class, NULL);
4145                         mono_class_init (handle_class);
4146
4147                         target = handle;
4148                         continue;
4149                 }
4150                 case MONO_PATCH_INFO_EXC:
4151                         /* everything is dealt with at epilog output time */
4152                         continue;
4153                 default:
4154                         g_assert_not_reached ();
4155                 }
4156                 s390_patch (ip, target);
4157         }
4158 }
4159
4160 /*========================= End of Function ========================*/
4161
4162 /*------------------------------------------------------------------*/
4163 /*                                                                  */
4164 /* Name         - mono_arch_max_epilog_size                         */
4165 /*                                                                  */
4166 /* Function     - Determine the maximum size of the epilog code.    */
4167 /*                                                                  */
4168 /*------------------------------------------------------------------*/
4169
4170 int
4171 mono_arch_max_epilog_size (MonoCompile *cfg)
4172 {
4173         int max_epilog_size = 96;
4174         MonoJumpInfo *patch_info;
4175
4176         if (cfg->method->save_lmf)
4177                 max_epilog_size += 128;
4178
4179         if (mono_jit_trace_calls != NULL)
4180                 max_epilog_size += 128;
4181
4182         if (cfg->prof_options & MONO_PROFILE_ENTER_LEAVE)
4183                 max_epilog_size += 128;
4184
4185         /* count the number of exception infos */
4186
4187         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4188                 if (patch_info->type == MONO_PATCH_INFO_EXC)
4189                         max_epilog_size += 26;
4190         }
4191
4192         return max_epilog_size;
4193 }
4194
4195 /*========================= End of Function ========================*/
4196
4197 /*------------------------------------------------------------------*/
4198 /*                                                                  */
4199 /* Name         - mono_arch_emit_prolog                             */
4200 /*                                                                  */
4201 /* Function     - Create the instruction sequence for a function    */
4202 /*                prolog.                                           */
4203 /*                                                                  */
4204 /*------------------------------------------------------------------*/
4205
4206 guint8 *
4207 mono_arch_emit_prolog (MonoCompile *cfg)
4208 {
4209         MonoMethod *method = cfg->method;
4210         MonoBasicBlock *bb;
4211         MonoMethodSignature *sig;
4212         MonoInst *inst;
4213         int alloc_size, pos, max_offset, i, lmfOffset;
4214         guint8 *code;
4215         CallInfo *cinfo;
4216         size_data sz;
4217         int tracing = 0;
4218
4219         if (mono_jit_trace_calls != NULL && mono_trace_eval (method))
4220                 tracing = 1;
4221
4222         cfg->code_size   = 256;
4223         cfg->native_code = code = g_malloc (cfg->code_size);
4224
4225         s390_stm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4226
4227         if (cfg->flags & MONO_CFG_HAS_ALLOCA) {
4228                 cfg->used_int_regs |= 1 << 11;
4229         }
4230
4231         alloc_size = cfg->stack_offset;
4232         if (tracing)
4233                 alloc_size += S390_TRACE_STACK_SIZE;
4234         pos = 0;
4235         /* reserve room to save return value */
4236         if (tracing)
4237                 pos += 8;
4238
4239         alloc_size += pos;
4240
4241         if (method->save_lmf)
4242                 alloc_size += sizeof(MonoLMF);
4243
4244         alloc_size = S390_ALIGN(alloc_size, S390_STACK_ALIGNMENT);
4245
4246         cfg->stack_usage = alloc_size;
4247         g_assert (s390_is_imm16 (-alloc_size));
4248         if (alloc_size) {
4249                 s390_lr   (code, s390_r11, STK_BASE);
4250                 s390_ahi  (code, STK_BASE, -alloc_size);
4251                 s390_st   (code, s390_r11, 0, STK_BASE, 0);
4252         }
4253
4254         if (cfg->flags & MONO_CFG_HAS_ALLOCA)
4255                 s390_lr (code, s390_r11, STK_BASE);
4256
4257         /* compute max_offset in order to use short forward jumps
4258          * we always do it on s390 because the immediate displacement
4259          * for jumps is too small
4260          */
4261         max_offset = 0;
4262         for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
4263                 MonoInst *ins = bb->code;
4264                 bb->max_offset = max_offset;
4265
4266                 if (cfg->prof_options & MONO_PROFILE_COVERAGE)
4267                         max_offset += 6;
4268
4269                 while (ins) {
4270                         max_offset += ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
4271                         ins = ins->next;
4272                 }
4273         }
4274
4275         /* load arguments allocated to register from the stack */
4276         sig = method->signature;
4277         pos = 0;
4278
4279         cinfo = calculate_sizes (sig, &sz, sig->pinvoke);
4280
4281         if (cinfo->struct_ret) {
4282                 ArgInfo *ainfo = &cinfo->ret;
4283                 inst         = cfg->ret;
4284                 inst->unused = ainfo->vtsize;
4285                 s390_st (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4286         }
4287
4288         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
4289                 ArgInfo *ainfo = cinfo->args + i;
4290                 inst = cfg->varinfo [pos];
4291
4292                 if (inst->opcode == OP_REGVAR) {
4293                         if (ainfo->regtype == RegTypeGeneral)
4294                                 s390_lr (code, inst->dreg, ainfo->reg);
4295                         else if (ainfo->regtype == RegTypeFP) {
4296                                 if (ainfo->size == 4) {
4297                                         s390_ledbr (code, inst->dreg, ainfo->reg);
4298                                 } else {
4299                                         s390_ldr   (code, inst->dreg, ainfo->reg);
4300                                 }
4301                         }
4302                         else if (ainfo->regtype == RegTypeBase) {
4303                                 s390_lr  (code, s390_r13, STK_BASE);
4304                                 s390_ahi (code, s390_r13, alloc_size);
4305                                 s390_l   (code, inst->dreg, 0, s390_r13, ainfo->offset);
4306                         } else
4307                                 g_assert_not_reached ();
4308
4309                         if (cfg->verbose_level > 2)
4310                                 g_print ("Argument %d assigned to register %s\n",
4311                                          pos, mono_arch_regname (inst->dreg));
4312                 } else {
4313                         if (ainfo->regtype == RegTypeGeneral) {
4314                                 if (!((ainfo->reg >= 2) && (ainfo->reg <= 6)))
4315                                         g_assert_not_reached();
4316                                 switch (ainfo->size) {
4317                                 case 1:
4318                                         s390_stc (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4319                                         break;
4320                                 case 2:
4321                                         s390_sth (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4322                                         break;
4323                                 case 8:
4324                                         s390_stm (code, ainfo->reg, ainfo->reg + 1,
4325                                                   inst->inst_basereg, inst->inst_offset);
4326                                         break;
4327                                 default:
4328                                         s390_st  (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4329                                 }
4330                         } else if (ainfo->regtype == RegTypeBase) {
4331                         } else if (ainfo->regtype == RegTypeFP) {
4332                                 if (ainfo->size == 8)
4333                                         s390_std (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4334                                 else if (ainfo->size == 4)
4335                                         s390_ste (code, ainfo->reg, 0, inst->inst_basereg, inst->inst_offset);
4336                                 else
4337                                         g_assert_not_reached ();
4338                         } else if (ainfo->regtype == RegTypeStructByVal) {
4339                                 int doffset = inst->inst_offset;
4340                                 int reg;
4341                                 if (ainfo->reg != STK_BASE)
4342                                         reg = ainfo->reg;
4343                                 else {
4344                                         reg = s390_r0;
4345                                         s390_lr  (code, s390_r13, STK_BASE);
4346                                         s390_ahi (code, s390_r13, alloc_size);
4347                                 }
4348                                 switch (ainfo->size) {
4349                                         case 1:
4350                                                 if (ainfo->reg == STK_BASE)
4351                                                         s390_ic  (code, reg, 0, s390_r13, ainfo->offset+3);
4352                                                 s390_stc (code, reg, 0, inst->inst_basereg, doffset);
4353                                                 break;
4354                                         case 2:
4355                                                 if (ainfo->reg == STK_BASE)
4356                                                         s390_lh  (code, reg, 0, s390_r13, ainfo->offset+2);
4357                                                 s390_sth (code, reg, 0, inst->inst_basereg, doffset);
4358                                                 break;
4359                                         case 4:
4360                                                 if (ainfo->reg == STK_BASE)
4361                                                         s390_l   (code, reg, 0, s390_r13, ainfo->offset);
4362                                                 s390_st  (code, reg, 0, inst->inst_basereg, doffset);
4363                                                 break;
4364                                         case 8:
4365                                                 if (ainfo->reg == STK_BASE)
4366                                                         s390_lm  (code, s390_r0, s390_r1, s390_r13, ainfo->offset);
4367                                                 s390_stm (code, reg, reg+1, inst->inst_basereg, doffset);
4368                                                 break;
4369                                 }
4370                         } else if (ainfo->regtype == RegTypeStructByAddr) {
4371                                 code = emit_memcpy (code, ainfo->vtsize,
4372                                                     inst->inst_basereg, inst->inst_offset, ainfo->reg, 0);
4373                         } else
4374                                 g_assert_not_reached ();
4375                 }
4376                 pos++;
4377         }
4378
4379         if (method->save_lmf) {
4380                 /*---------------------------------------------------------------*/
4381                 /* Preserve the parameter registers while we fix up the lmf      */
4382                 /*---------------------------------------------------------------*/
4383                 s390_lr (code, s390_r7, s390_r2);
4384                 s390_lr (code, s390_r8, s390_r3);
4385                 s390_lr (code, s390_r9, s390_r4);
4386                 s390_lr (code, s390_r10, s390_r5);
4387
4388                 mono_add_patch_info (cfg, code - cfg->native_code,
4389                                      MONO_PATCH_INFO_INTERNAL_METHOD,
4390                                      (gpointer)"mono_get_lmf_addr");
4391                 /*---------------------------------------------------------------*/
4392                 /* On return from this call r2 have the address of the &lmf      */
4393                 /*---------------------------------------------------------------*/
4394                 s390_brasl (code, s390_r14, 0);
4395
4396                 /*---------------------------------------------------------------*/
4397                 /* we build the MonoLMF structure on the stack - see mini-s390.h */
4398                 /*---------------------------------------------------------------*/
4399                 lmfOffset = S390_MINIMAL_STACK_SIZE + cfg->param_area;
4400                 if (tracing)
4401                         lmfOffset += S390_TRACE_STACK_SIZE;
4402
4403                 s390_lr    (code, s390_r13, cfg->frame_reg);
4404                 s390_ahi   (code, s390_r13, lmfOffset);
4405
4406                 /*---------------------------------------------------------------*/
4407                 /* Set lmf.lmf_addr = jit_tls->lmf                               */
4408                 /*---------------------------------------------------------------*/
4409                 s390_st    (code, s390_r2, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4410
4411                 /*---------------------------------------------------------------*/
4412                 /* Get current lmf                                               */
4413                 /*---------------------------------------------------------------*/
4414                 s390_l     (code, s390_r0, 0, s390_r2, 0);
4415
4416                 /*---------------------------------------------------------------*/
4417                 /* Set our lmf as the current lmf                                */
4418                 /*---------------------------------------------------------------*/
4419                 s390_st    (code, s390_r13, 0, s390_r2, 0);
4420
4421                 /*---------------------------------------------------------------*/
4422                 /* Have our lmf.previous_lmf point to the last lmf               */
4423                 /*---------------------------------------------------------------*/
4424                 s390_st    (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4425
4426                 /*---------------------------------------------------------------*/
4427                 /* save method info                                              */
4428                 /*---------------------------------------------------------------*/
4429                 s390_basr  (code, s390_r1, 0);
4430                 s390_j     (code, 4);
4431                 s390_word  (code, method);
4432                 s390_l     (code, s390_r1, 0, s390_r1, 4);
4433                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, method));
4434                 s390_st    (code, cfg->frame_reg, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
4435
4436                 /*---------------------------------------------------------------*/
4437                 /* save the current IP                                           */
4438                 /*---------------------------------------------------------------*/
4439                 s390_larl  (code, s390_r1, 0);
4440                 s390_st    (code, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
4441
4442                 /*---------------------------------------------------------------*/
4443                 /* Restore the parameter registers now that we've set up the lmf */
4444                 /*---------------------------------------------------------------*/
4445                 s390_lr (code, s390_r2, s390_r7);
4446                 s390_lr (code, s390_r3, s390_r8);
4447                 s390_lr (code, s390_r4, s390_r9);
4448                 s390_lr (code, s390_r5, s390_r10);
4449         }
4450
4451         if (tracing)
4452                 code = mono_arch_instrument_prolog (cfg, enter_method, code, TRUE);
4453
4454         cfg->code_len = code - cfg->native_code;
4455         g_free (cinfo);
4456
4457         return code;
4458 }
4459
4460 /*========================= End of Function ========================*/
4461
4462 /*------------------------------------------------------------------*/
4463 /*                                                                  */
4464 /* Name         - mono_arch_emit_epilog                             */
4465 /*                                                                  */
4466 /* Function     - Emit the instructions for a function epilog.      */
4467 /*                                                                  */
4468 /*------------------------------------------------------------------*/
4469
4470 void
4471 mono_arch_emit_epilog (MonoCompile *cfg)
4472 {
4473         MonoJumpInfo *patch_info;
4474         MonoMethod *method = cfg->method;
4475         MonoMethodSignature *sig = method->signature;
4476         MonoInst *inst;
4477         int i, lmfOffset, tracing = 0;
4478         guint8 *code;
4479
4480         code = cfg->native_code + cfg->code_len;
4481
4482         if (mono_jit_trace_calls != NULL && mono_trace_eval (method))
4483                 tracing = 1;
4484
4485         if (method->save_lmf) {
4486                 s390_lr  (code, s390_r13, cfg->frame_reg);
4487
4488                 lmfOffset = S390_MINIMAL_STACK_SIZE + cfg->param_area;
4489                 if (tracing)
4490                         lmfOffset += S390_TRACE_STACK_SIZE;
4491
4492                 /*-------------------------------------------------*/
4493                 /* r13 = my lmf                                    */
4494                 /*-------------------------------------------------*/
4495                 s390_ahi (code, s390_r13, lmfOffset);
4496
4497                 /*-------------------------------------------------*/
4498                 /* r6 = &jit_tls->lmf                              */
4499                 /*-------------------------------------------------*/
4500                 s390_l   (code, s390_r6, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, lmf_addr));
4501
4502                 /*-------------------------------------------------*/
4503                 /* r0 = lmf.previous_lmf                           */
4504                 /*-------------------------------------------------*/
4505                 s390_l   (code, s390_r0, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, previous_lmf));
4506
4507                 /*-------------------------------------------------*/
4508                 /* jit_tls->lmf = previous_lmf                     */
4509                 /*-------------------------------------------------*/
4510                 s390_l   (code, s390_r13, 0, s390_r6, 0);
4511                 s390_st  (code, s390_r0, 0, s390_r6, 0);
4512         }
4513
4514         if (cfg->frame_reg != STK_BASE)
4515                 s390_lr  (code, STK_BASE, cfg->frame_reg);
4516
4517         s390_ahi (code, STK_BASE, cfg->stack_usage);
4518         s390_lm  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
4519         s390_br  (code, s390_r14);
4520
4521         /* add code to raise exceptions */
4522         for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
4523                 switch (patch_info->type) {
4524                 case MONO_PATCH_INFO_EXC: {
4525                         /*-----------------------------------------------------*/
4526                         /* Patch the branch in epilog to come here             */
4527                         /*-----------------------------------------------------*/
4528                         s390_patch (patch_info->ip.i+cfg->native_code+2,
4529                                     S390_RELATIVE(code,patch_info->ip.i+cfg->native_code));
4530                         /*-----------------------------------------------------*/
4531                         /* Patch the parameter passed to the handler           */
4532                         /*-----------------------------------------------------*/
4533                         s390_basr (code, s390_r13, 0);
4534                         s390_j    (code, 4);
4535                         mono_add_patch_info (cfg, code - cfg->native_code,
4536                                              MONO_PATCH_INFO_EXC_NAME,
4537                                              patch_info->data.target);
4538                         s390_word (code, 0);
4539                         /*-----------------------------------------------------*/
4540                         /* Load the return address and the parameter register  */
4541                         /*-----------------------------------------------------*/
4542                         s390_larl (code, s390_r14, S390_RELATIVE((patch_info->ip.i +
4543                                                    cfg->native_code + 8), code));
4544                         s390_l    (code, s390_r2, 0, s390_r13, 4);
4545                         /*-----------------------------------------------------*/
4546                         /* Reuse the current patch to set the jump             */
4547                         /*-----------------------------------------------------*/
4548                         patch_info->type      = MONO_PATCH_INFO_INTERNAL_METHOD;
4549                         patch_info->data.name = "mono_arch_throw_exception_by_name";
4550                         patch_info->ip.i      = code - cfg->native_code;
4551                         s390_jcl  (code, S390_CC_UN, 0);
4552                         break;
4553                 }
4554                 default:
4555                         /* do nothing */
4556                         break;
4557                 }
4558         }
4559
4560         cfg->code_len = code - cfg->native_code;
4561
4562         g_assert (cfg->code_len < cfg->code_size);
4563
4564 }
4565
4566 /*========================= End of Function ========================*/
4567
4568 /*------------------------------------------------------------------*/
4569 /*                                                                  */
4570 /* Name         - mono_arch_setup_jit_tls_data                      */
4571 /*                                                                  */
4572 /* Function     - Setup the JIT's Thread Level Specific Data.       */
4573 /*                                                                  */
4574 /*------------------------------------------------------------------*/
4575
4576 void
4577 mono_arch_setup_jit_tls_data (MonoJitTlsData *tls)
4578 {
4579 }
4580
4581 /*========================= End of Function ========================*/
4582
4583 /*------------------------------------------------------------------*/
4584 /*                                                                  */
4585 /* Name         - mono_arch_free_jit_tls_data                       */
4586 /*                                                                  */
4587 /* Function     - Free tls data.                                    */
4588 /*                                                                  */
4589 /*------------------------------------------------------------------*/
4590
4591 void
4592 mono_arch_free_jit_tls_data (MonoJitTlsData *tls)
4593 {
4594 }
4595
4596 /*========================= End of Function ========================*/
4597
4598 /*------------------------------------------------------------------*/
4599 /*                                                                  */
4600 /* Name         - mono_arch_emit_this_vret_args                     */
4601 /*                                                                  */
4602 /* Function     -                                                   */
4603 /*                                                                  */
4604 /*------------------------------------------------------------------*/
4605
4606 void
4607 mono_arch_emit_this_vret_args (MonoCompile *cfg, MonoCallInst *inst, int this_reg, int this_type, int vt_reg)
4608 {
4609         int this_dreg = s390_r2;
4610
4611         if (vt_reg != -1)
4612                 this_dreg = s390_r3;
4613
4614         /* add the this argument */
4615         if (this_reg != -1) {
4616                 MonoInst *this;
4617                 MONO_INST_NEW (cfg, this, OP_SETREG);
4618                 this->type = this_type;
4619                 this->sreg1 = this_reg;
4620                 this->dreg = this_dreg;
4621                 mono_bblock_add_inst (cfg->cbb, this);
4622         }
4623
4624         if (vt_reg != -1) {
4625                 MonoInst *vtarg;
4626                 MONO_INST_NEW (cfg, vtarg, OP_SETREG);
4627                 vtarg->type = STACK_MP;
4628                 vtarg->sreg1 = vt_reg;
4629                 vtarg->dreg = s390_r2;
4630                 mono_bblock_add_inst (cfg->cbb, vtarg);
4631         }
4632 }
4633
4634 /*========================= End of Function ========================*/
4635
4636 /*------------------------------------------------------------------*/
4637 /*                                                                  */
4638 /* Name         - mono_arch_get_opcode_for_method                   */
4639 /*                                                                  */
4640 /* Function     - Check for opcodes we can handle directly in       */
4641 /*                hardware.                                         */
4642 /*                                                                  */
4643 /*------------------------------------------------------------------*/
4644
4645 gint
4646 mono_arch_get_opcode_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsig, MonoInst **args)
4647 {
4648         if (cmethod->klass == mono_defaults.math_class) {
4649                 if (strcmp (cmethod->name, "Sqrt") == 0)
4650                         return OP_SQRT;
4651         }
4652         return -1;
4653 }
4654
4655 /*========================= End of Function ========================*/
4656
4657 /*------------------------------------------------------------------*/
4658 /*                                                                  */
4659 /* Name         - mono_arch_print_tree                              */
4660 /*                                                                  */
4661 /* Function     - Print platform-specific opcode details.           */
4662 /*                                                                  */
4663 /* Returns      - 1 - opcode details have been printed              */
4664 /*                0 - opcode details have not been printed          */
4665 /*                                                                  */
4666 /*------------------------------------------------------------------*/
4667
4668 gboolean
4669 mono_arch_print_tree (MonoInst *tree, int arity)
4670 {
4671         gboolean done;
4672
4673         switch (tree->opcode) {
4674                 case OP_S390_LOADARG:
4675                 case OP_S390_ARGPTR:
4676                 case OP_S390_STKARG:
4677                         printf ("[0x%x(%s)]", tree->inst_offset,
4678                                 mono_arch_regname (tree->inst_basereg));
4679                         done = 1;
4680                         break;
4681                 default:
4682                         done = 0;
4683         }
4684         return (done);
4685 }
4686
4687 /*========================= End of Function ========================*/
4688
4689 /*------------------------------------------------------------------*/
4690 /*                                                                  */
4691 /* Name         - mono_arch_regalloc_cost                           */
4692 /*                                                                  */
4693 /* Function     - Determine the cost, in the number of memory       */
4694 /*                references, of the action of allocating the var-  */
4695 /*                iable VMV into a register during global register  */
4696 /*                allocation.                                       */
4697 /*                                                                  */
4698 /* Returns      - Cost                                              */
4699 /*                                                                  */
4700 /*------------------------------------------------------------------*/
4701
4702 guint32
4703 mono_arch_regalloc_cost (MonoCompile *cfg, MonoMethodVar *vmv)
4704 {
4705         /* FIXME: */
4706         return 3;
4707 }
4708
4709 /*========================= End of Function ========================*/