mono/mini/tramp-s390x.c

   1 /*------------------------------------------------------------------*/
   2 /*                                                                  */
   3 /* Name        - tramp-s390x.c                                      */
   4 /*                                                                  */
   5 /* Function    - JIT trampoline code for S/390.                     */
   6 /*                                                                  */
   7 /* Name        - Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com) */
   8 /*                                                                  */
   9 /* Date        - January, 2004                                      */
  10 /*                                                                  */
  11 /* Derivation  - From exceptions-x86 & exceptions-ppc               */
  12 /*               Paolo Molaro (lupus@ximian.com)                    */
  13 /*               Dietmar Maurer (dietmar@ximian.com)                */
  14 /*                                                                  */
  15 /* Copyright   - 2001 Ximian, Inc.                                  */
  16 /* Licensed under the MIT license. See LICENSE file in the project root for full license information.*/
  17 /*------------------------------------------------------------------*/
  18
  19 /*------------------------------------------------------------------*/
  20 /*                 D e f i n e s                                    */
  21 /*------------------------------------------------------------------*/
  22
  23 #define LMFReg  s390_r13
  24
  25 /*
  26  * Method-specific trampoline code fragment sizes
  27  */
  28 #define SPECIFIC_TRAMPOLINE_SIZE        96
  29
  30 /*========================= End of Defines =========================*/
  31
  32 /*------------------------------------------------------------------*/
  33 /*                 I n c l u d e s                                  */
  34 /*------------------------------------------------------------------*/
  35
  36 #include <config.h>
  37 #include <glib.h>
  38 #include <string.h>
  39
  40 #include <mono/metadata/abi-details.h>
  41 #include <mono/metadata/appdomain.h>
  42 #include <mono/metadata/gc-internals.h>
  43 #include <mono/metadata/marshal.h>
  44 #include <mono/metadata/profiler-private.h>
  45 #include <mono/metadata/tabledefs.h>
  46 #include <mono/arch/s390x/s390x-codegen.h>
  47
  48 #include "mini.h"
  49 #include "mini-s390x.h"
  50 #include "support-s390x.h"
  51 #include "jit-icalls.h"
  52
  53 /*========================= End of Includes ========================*/
  54
  55 /*------------------------------------------------------------------*/
  56 /*                 T y p e d e f s                                  */
  57 /*------------------------------------------------------------------*/
  58
  59 typedef struct {
  60         guint8  stk[S390_MINIMAL_STACK_SIZE];   /* Standard s390x stack */
  61         guint64 saveFn;                         /* Call address         */
  62         struct MonoLMF  LMF;                    /* LMF                  */
  63 } trampStack_t;
  64
  65 /*========================= End of Typedefs ========================*/
  66
  67 /*------------------------------------------------------------------*/
  68 /*                   P r o t o t y p e s                            */
  69 /*------------------------------------------------------------------*/
  70
  71 /*========================= End of Prototypes ======================*/
  72
  73 /*------------------------------------------------------------------*/
  74 /*                 G l o b a l   V a r i a b l e s                  */
  75 /*------------------------------------------------------------------*/
  76
  77
  78 /*====================== End of Global Variables ===================*/
  79
  80 /*------------------------------------------------------------------*/
  81 /*                                                                  */
  82 /* Name         - mono_arch_get_unbox_trampoline                    */
  83 /*                                                                  */
  84 /* Function     - Return a pointer to a trampoline which does the   */
  85 /*                unboxing before calling the method.               */
  86 /*                                                                  */
  87 /*                When value type methods are called through the    */
  88 /*                vtable we need to unbox the 'this' argument.      */
  89 /*                                                                  */
  90 /* Parameters   - method - Methd pointer                            */
  91 /*                addr   - Pointer to native code for method        */
  92 /*                                                                  */
  93 /*------------------------------------------------------------------*/
  94
  95 gpointer
  96 mono_arch_get_unbox_trampoline (MonoMethod *method, gpointer addr)
  97 {
  98         guint8 *code, *start;
  99         int this_pos = s390_r2;
 100         MonoDomain *domain = mono_domain_get ();
 101         char trampName[128];
 102
 103         start = code = mono_domain_code_reserve (domain, 28);
 104
 105         S390_SET  (code, s390_r1, addr);
 106         s390_aghi (code, this_pos, sizeof(MonoObject));
 107         s390_br   (code, s390_r1);
 108
 109         g_assert ((code - start) <= 28);
 110
 111         mono_arch_flush_icache (start, code - start);
 112         mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, method);
 113
 114         snprintf(trampName, sizeof(trampName), "%s_unbox_trampoline", method->name);
 115
 116         mono_tramp_info_register (mono_tramp_info_create (trampName, start, code - start, NULL, NULL), domain);
 117
 118         return start;
 119 }
 120
 121 /*========================= End of Function ========================*/
 122
 123 /*------------------------------------------------------------------*/
 124 /*                                                                  */
 125 /* Name         - mono_arch_patch_callsite                          */
 126 /*                                                                  */
 127 /* Function     - Patch a non-virtual callsite so it calls @addr.   */
 128 /*                                                                  */
 129 /*------------------------------------------------------------------*/
 130
 131 void
 132 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
 133 {
 134         gint32 displace;
 135         unsigned short opcode;
 136
 137         opcode = *((unsigned short *) (orig_code - 2));
 138         if (opcode == 0x0dee) {
 139                 /* This should be a 'iihf/iilf' sequence */
 140                 S390_EMIT_CALL((orig_code - 14), addr);
 141                 mono_arch_flush_icache (orig_code - 14, 12);
 142         } else {
 143                 /* This is the 'brasl' instruction */
 144                 orig_code    -= 4;
 145                 displace = ((gssize) addr - (gssize) (orig_code - 2)) / 2;
 146                 s390_patch_rel (orig_code, displace);
 147                 mono_arch_flush_icache (orig_code, 4);
 148         }
 149 }
 150
 151 /*========================= End of Function ========================*/
 152
 153 /*------------------------------------------------------------------*/
 154 /*                                                                  */
 155 /* Name         - mono_arch_patch_plt_entry.                        */
 156 /*                                                                  */
 157 /* Function     - Patch a PLT entry - unused as yet.                */
 158 /*                                                                  */
 159 /*------------------------------------------------------------------*/
 160
 161 void
 162 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
 163 {
 164         g_assert_not_reached ();
 165 }
 166
 167 /*========================= End of Function ========================*/
 168
 169 /*------------------------------------------------------------------*/
 170 /*                                                                  */
 171 /* Name         - mono_arch_create_trampoline_code                  */
 172 /*                                                                  */
 173 /* Function     - Create the designated type of trampoline according*/
 174 /*                to the 'tramp_type' parameter.                    */
 175 /*                                                                  */
 176 /*------------------------------------------------------------------*/
 177
 178 guchar*
 179 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
 180 {
 181         char *tramp_name;
 182         guint8 *buf, *tramp, *code;
 183         int i, offset, has_caller;
 184         GSList *unwind_ops = NULL;
 185         MonoJumpInfo *ji = NULL;
 186
 187         g_assert (!aot);
 188
 189         /* Now we'll create in 'buf' the S/390 trampoline code. This
 190            is the trampoline code common to all methods  */
 191
 192         code = buf = mono_global_codeman_reserve(512);
 193
 194         if ((tramp_type == MONO_TRAMPOLINE_JUMP) ||
 195             (tramp_type == MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD))
 196                 has_caller = 0;
 197         else
 198                 has_caller = 1;
 199
 200         /*-----------------------------------------------------------
 201           STEP 0: First create a non-standard function prologue with a
 202           stack size big enough to save our registers.
 203           -----------------------------------------------------------*/
 204
 205         s390_stmg (buf, s390_r6, s390_r15, STK_BASE, S390_REG_SAVE_OFFSET);
 206         s390_lgr  (buf, s390_r11, s390_r15);
 207         s390_aghi (buf, STK_BASE, -sizeof(trampStack_t));
 208         s390_stg  (buf, s390_r11, 0, STK_BASE, 0);
 209
 210         /*---------------------------------------------------------------*/
 211         /* we build the MonoLMF structure on the stack - see mini-s390.h */
 212         /* Keep in sync with the code in mono_arch_emit_prolog           */
 213         /*---------------------------------------------------------------*/
 214
 215         s390_lgr   (buf, LMFReg, STK_BASE);
 216         s390_aghi  (buf, LMFReg, G_STRUCT_OFFSET(trampStack_t, LMF));
 217
 218         /*---------------------------------------------------------------*/
 219         /* Save general and floating point registers in LMF              */
 220         /*---------------------------------------------------------------*/
 221         s390_stmg (buf, s390_r0, s390_r1, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[0]));
 222         s390_stmg (buf, s390_r2, s390_r5, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[2]));
 223         s390_mvc  (buf, 10*sizeof(gulong), LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[6]),
 224                    s390_r11, S390_REG_SAVE_OFFSET);
 225
 226         offset = G_STRUCT_OFFSET(MonoLMF, fregs[0]);
 227         for (i = s390_f0; i <= s390_f15; ++i) {
 228                 s390_std  (buf, i, 0, LMFReg, offset);
 229                 offset += sizeof(gdouble);
 230         }
 231
 232         /*----------------------------------------------------------
 233           STEP 1: call 'mono_get_lmf_addr()' to get the address of our
 234           LMF. We'll need to restore it after the call to
 235           's390_magic_trampoline' and before the call to the native
 236           method.
 237           ----------------------------------------------------------*/
 238
 239         S390_SET  (buf, s390_r1, mono_get_lmf_addr);
 240         s390_basr (buf, s390_r14, s390_r1);
 241
 242         /*---------------------------------------------------------------*/
 243         /* Set lmf.lmf_addr = jit_tls->lmf                               */
 244         /*---------------------------------------------------------------*/
 245         s390_stg   (buf, s390_r2, 0, LMFReg,
 246                             G_STRUCT_OFFSET(MonoLMF, lmf_addr));
 247
 248         /*---------------------------------------------------------------*/
 249         /* Get current lmf                                               */
 250         /*---------------------------------------------------------------*/
 251         s390_lg    (buf, s390_r0, 0, s390_r2, 0);
 252
 253         /*---------------------------------------------------------------*/
 254         /* Set our lmf as the current lmf                                */
 255         /*---------------------------------------------------------------*/
 256         s390_stg   (buf, LMFReg, 0, s390_r2, 0);
 257
 258         /*---------------------------------------------------------------*/
 259         /* Have our lmf.previous_lmf point to the last lmf               */
 260         /*---------------------------------------------------------------*/
 261         s390_stg   (buf, s390_r0, 0, LMFReg,
 262                             G_STRUCT_OFFSET(MonoLMF, previous_lmf));
 263
 264         /*---------------------------------------------------------------*/
 265         /* save method info                                              */
 266         /*---------------------------------------------------------------*/
 267         s390_lg    (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[1]));
 268         s390_stg   (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, method));
 269
 270         /*---------------------------------------------------------------*/
 271         /* save the current SP                                           */
 272         /*---------------------------------------------------------------*/
 273         s390_lg    (buf, s390_r1, 0, STK_BASE, 0);
 274         s390_stg   (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, ebp));
 275
 276         /*---------------------------------------------------------------*/
 277         /* save the current IP                                           */
 278         /*---------------------------------------------------------------*/
 279         if (has_caller) {
 280                 s390_lg    (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
 281         } else {
 282                 s390_lghi  (buf, s390_r1, 0);
 283         }
 284         s390_stg   (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, eip));
 285
 286         /*---------------------------------------------------------------*/
 287         /* STEP 2: call the C trampoline function                        */
 288         /*---------------------------------------------------------------*/
 289
 290         /* Set arguments */
 291
 292         /* Arg 1: mgreg_t *regs */
 293         s390_la  (buf, s390_r2, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[0]));
 294
 295         /* Arg 2: code (next address to the instruction that called us) */
 296         if (has_caller) {
 297                 s390_lg   (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
 298         } else {
 299                 s390_lghi (buf, s390_r3, 0);
 300         }
 301
 302         /* Arg 3: Trampoline argument */
 303         s390_lg (buf, s390_r4, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[1]));
 304
 305         /* Arg 4: trampoline address. */
 306         S390_SET (buf, s390_r5, buf);
 307
 308         /* Calculate call address and call the C trampoline. Return value will be in r2 */
 309         tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 310         S390_SET  (buf, s390_r1, tramp);
 311         s390_basr (buf, s390_r14, s390_r1);
 312
 313         /* OK, code address is now on r2. Save it, so that we
 314            can restore r2 and use it later */
 315         s390_stg  (buf, s390_r2, 0, STK_BASE, G_STRUCT_OFFSET(trampStack_t, saveFn));
 316
 317         /* Check for thread interruption */
 318         S390_SET  (buf, s390_r1, (guint8 *)mono_interruption_checkpoint_from_trampoline);
 319         s390_basr (buf, s390_r14, s390_r1);
 320
 321         /*----------------------------------------------------------
 322           STEP 3: Restore the LMF
 323           ----------------------------------------------------------*/
 324         restoreLMF(buf, STK_BASE, sizeof(trampStack_t));
 325
 326         /* Reload result */
 327         s390_lg   (buf, s390_r1, 0, STK_BASE, G_STRUCT_OFFSET(trampStack_t, saveFn));
 328
 329         /*----------------------------------------------------------
 330           STEP 4: call the compiled method
 331           ----------------------------------------------------------*/
 332
 333         /* Restore parameter registers */
 334         s390_lmg (buf, s390_r2, s390_r5, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[2]));
 335
 336         /* Restore the FP registers */
 337         offset = G_STRUCT_OFFSET(MonoLMF, fregs[0]);
 338         for (i = s390_f0; i <= s390_f15; ++i) {
 339                 s390_ld  (buf, i, 0, LMFReg, offset);
 340                 offset += sizeof(gdouble);
 341         }
 342
 343         /* Restore stack pointer and jump to the code -
 344          * R14 contains the return address to our caller
 345          */
 346         s390_lgr  (buf, STK_BASE, s390_r11);
 347         s390_lmg  (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 348
 349         if (MONO_TRAMPOLINE_TYPE_MUST_RETURN(tramp_type)) {
 350                 s390_lgr (buf, s390_r2, s390_r1);
 351                 s390_br  (buf, s390_r14);
 352         } else {
 353                 s390_br  (buf, s390_r1);
 354         }
 355
 356         /* Flush instruction cache, since we've generated code */
 357         mono_arch_flush_icache (code, buf - code);
 358         mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
 359
 360         g_assert (info);
 361         tramp_name = mono_get_generic_trampoline_name (tramp_type);
 362         *info = mono_tramp_info_create (tramp_name, buf, buf - code, ji, unwind_ops);
 363         g_free (tramp_name);
 364
 365         /* Sanity check */
 366         g_assert ((buf - code) <= 512);
 367
 368         return code;
 369 }
 370
 371 /*========================= End of Function ========================*/
 372
 373 /*------------------------------------------------------------------*/
 374 /*                                                                  */
 375 /* Name         - mono_arch_invalidate_method                       */
 376 /*                                                                  */
 377 /* Function     -                                                   */
 378 /*                                                                  */
 379 /*------------------------------------------------------------------*/
 380
 381 void
 382 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
 383 {
 384         /* FIXME: This is not thread safe */
 385         guint8 *code = ji->code_start;
 386
 387         S390_SET  (code, s390_r1, func);
 388         S390_SET  (code, s390_r2, func_arg);
 389         s390_br   (code, s390_r1);
 390
 391 }
 392
 393 /*========================= End of Function ========================*/
 394
 395 /*------------------------------------------------------------------*/
 396 /*                                                                  */
 397 /* Name         - mono_arch_create_specific_trampoline              */
 398 /*                                                                  */
 399 /* Function     - Creates the given kind of specific trampoline     */
 400 /*                                                                  */
 401 /*------------------------------------------------------------------*/
 402
 403 gpointer
 404 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 405 {
 406         guint8 *code, *buf, *tramp;
 407         gint32 displace;
 408
 409         tramp = mono_get_trampoline_code (tramp_type);
 410
 411         /*----------------------------------------------------------*/
 412         /* This is the method-specific part of the trampoline. Its  */
 413         /* purpose is to provide the generic part with the          */
 414         /* MonoMethod *method pointer. We'll use r1 to keep it.     */
 415         /*----------------------------------------------------------*/
 416         code = buf = mono_domain_code_reserve (domain, SPECIFIC_TRAMPOLINE_SIZE);
 417
 418         S390_SET  (buf, s390_r1, arg1);
 419         displace = (tramp - buf) / 2;
 420         s390_jg   (buf, displace);
 421
 422         /* Flush instruction cache, since we've generated code */
 423         mono_arch_flush_icache (code, buf - code);
 424         mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE,
 425                                        (void *) mono_get_generic_trampoline_simple_name (tramp_type));
 426
 427         /* Sanity check */
 428         g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
 429
 430         if (code_len)
 431                 *code_len = buf - code;
 432
 433         return code;
 434 }
 435
 436 /*========================= End of Function ========================*/
 437
 438 /*------------------------------------------------------------------*/
 439 /*                                                                  */
 440 /* Name         - mono_arch_create_rgctx_lazy_fetch_trampoline      */
 441 /*                                                                  */
 442 /* Function     -                                                   */
 443 /*                                                                  */
 444 /*------------------------------------------------------------------*/
 445
 446 gpointer
 447 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 448 {
 449         guint8 *tramp;
 450         guint8 *code, *buf;
 451         guint8 **rgctx_null_jumps;
 452         gint32 displace;
 453         int tramp_size,
 454             depth,
 455             index,
 456             iPatch = 0,
 457             i;
 458         gboolean mrgctx;
 459         MonoJumpInfo *ji = NULL;
 460         GSList *unwind_ops = NULL;
 461
 462         mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 463         index = MONO_RGCTX_SLOT_INDEX (slot);
 464         if (mrgctx)
 465                 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
 466         for (depth = 0; ; ++depth) {
 467                 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
 468
 469                 if (index < size - 1)
 470                         break;
 471                 index -= size - 1;
 472         }
 473
 474         tramp_size = 48 + 16 * depth;
 475         if (mrgctx)
 476                 tramp_size += 4;
 477         else
 478                 tramp_size += 12;
 479
 480         code = buf = mono_global_codeman_reserve (tramp_size);
 481
 482         unwind_ops = mono_arch_get_cie_program ();
 483
 484         rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
 485
 486         if (mrgctx) {
 487                 /* get mrgctx ptr */
 488                 s390_lgr (code, s390_r1, s390_r2);
 489         } else {
 490                 /* load rgctx ptr from vtable */
 491                 s390_lg (code, s390_r1, 0, s390_r2, MONO_STRUCT_OFFSET(MonoVTable, runtime_generic_context));
 492                 /* is the rgctx ptr null? */
 493                 s390_ltgr (code, s390_r1, s390_r1);
 494                 /* if yes, jump to actual trampoline */
 495                 rgctx_null_jumps [iPatch++] = code;
 496                 s390_jge (code, 0);
 497         }
 498
 499         for (i = 0; i < depth; ++i) {
 500                 /* load ptr to next array */
 501                 if (mrgctx && i == 0)
 502                         s390_lg (code, s390_r1, 0, s390_r1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
 503                 else
 504                         s390_lg (code, s390_r1, 0, s390_r1, 0);
 505                 s390_ltgr (code, s390_r1, s390_r1);
 506                 /* if the ptr is null then jump to actual trampoline */
 507                 rgctx_null_jumps [iPatch++] = code;
 508                 s390_jge (code, 0);
 509         }
 510
 511         /* fetch slot */
 512         s390_lg (code, s390_r1, 0, s390_r1, (sizeof (gpointer) * (index  + 1)));
 513         /* is the slot null? */
 514         s390_ltgr (code, s390_r1, s390_r1);
 515         /* if yes, jump to actual trampoline */
 516         rgctx_null_jumps [iPatch++] = code;
 517         s390_jge (code, 0);
 518         /* otherwise return r1 */
 519         s390_lgr (code, s390_r2, s390_r1);
 520         s390_br  (code, s390_r14);
 521
 522         for (i = 0; i < iPatch; i++) {
 523                 displace = ((uintptr_t) code - (uintptr_t) rgctx_null_jumps[i]) / 2;
 524                 s390_patch_rel ((rgctx_null_jumps [i] + 2), displace);
 525         }
 526
 527         g_free (rgctx_null_jumps);
 528
 529         /* move the rgctx pointer to the VTABLE register */
 530         s390_lgr (code, MONO_ARCH_VTABLE_REG, s390_r2);
 531
 532         tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot),
 533                 MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
 534
 535         /* jump to the actual trampoline */
 536         displace = (tramp - code) / 2;
 537         s390_jg (code, displace);
 538
 539         mono_arch_flush_icache (buf, code - buf);
 540         mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
 541
 542         g_assert (code - buf <= tramp_size);
 543
 544         char *name = mono_get_rgctx_fetch_trampoline_name (slot);
 545         *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
 546         g_free (name);
 547
 548         return(buf);
 549 }
 550
 551 /*========================= End of Function ========================*/
 552
 553 /*------------------------------------------------------------------*/
 554 /*                                                                  */
 555 /* Name         - mono_arch_get_static_rgctx_trampoline             */
 556 /*                                                                  */
 557 /* Function     - Create a trampoline which sets RGCTX_REG to MRGCTX*/
 558 /*                then jumps to ADDR.                               */
 559 /*                                                                  */
 560 /*------------------------------------------------------------------*/
 561
 562 gpointer
 563 mono_arch_get_static_rgctx_trampoline (MonoMethod *m,
 564                                         MonoMethodRuntimeGenericContext *mrgctx,
 565                                         gpointer addr)
 566 {
 567         guint8 *code, *start;
 568         gint32 displace;
 569         int buf_len;
 570         char trampName[128];
 571
 572         MonoDomain *domain = mono_domain_get ();
 573
 574         buf_len = 32;
 575
 576         start = code = mono_domain_code_reserve (domain, buf_len);
 577
 578         S390_SET  (code, MONO_ARCH_RGCTX_REG, mrgctx);
 579         displace = ((uintptr_t) addr - (uintptr_t) code) / 2;
 580         s390_jg   (code, displace);
 581         g_assert ((code - start) < buf_len);
 582
 583         mono_arch_flush_icache (start, code - start);
 584         mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
 585
 586         snprintf(trampName, sizeof(trampName), "%s_rgctx_trampoline", m->name);
 587
 588         mono_tramp_info_register (mono_tramp_info_create (trampName, start, code - start, NULL, NULL), domain);
 589
 590         return(start);
 591 }
 592
 593 /*========================= End of Function ========================*/
 594
 595 /*------------------------------------------------------------------*/
 596 /*                                                                  */
 597 /* Name         - handler_block_trampoline_helper                   */
 598 /*                                                                  */
 599 /* Function     -                                                   */
 600 /*                                                                  */
 601 /*------------------------------------------------------------------*/
 602
 603 static void
 604 handler_block_trampoline_helper (gpointer *ptr)
 605 {
 606         MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
 607         *ptr = jit_tls->handler_block_return_address;
 608 }
 609
 610 /*========================= End of Function ========================*/
 611
 612 /*------------------------------------------------------------------*/
 613 /*                                                                  */
 614 /* Name         - mono_arch_create_handler_block_trampoline         */
 615 /*                                                                  */
 616 /* Function     -                                                   */
 617 /*                                                                  */
 618 /*------------------------------------------------------------------*/
 619
 620 gpointer
 621 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
 622 {
 623         guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
 624         guint8 *code, *buf;
 625         int tramp_size = 64;
 626         MonoJumpInfo *ji = NULL;
 627         GSList *unwind_ops = NULL;
 628
 629         g_assert (!aot);
 630
 631         code = buf = mono_global_codeman_reserve (tramp_size);
 632
 633         /*
 634          * This trampoline restore the call chain of the handler block
 635          * then jumps into the code that deals with it.
 636          */
 637
 638         if (mono_get_jit_tls_offset () != -1) {
 639                 s390_ear  (code, s390_r1, 0);
 640                 s390_sllg (code, s390_r1, s390_r1, 0, 32);
 641                 s390_ear  (code, s390_r1, 1);
 642                 S390_SET  (code, s390_r14, mono_get_jit_tls_offset());
 643                 s390_lg   (code, s390_r14, s390_r1, 0, G_STRUCT_OFFSET(MonoJitTlsData, handler_block_return_address));
 644                 /*
 645                  * Simulate a call
 646                  */
 647                 S390_SET  (code, s390_r1, tramp);
 648                 s390_br   (code, s390_r1);
 649         } else {
 650                 /*
 651                  * Slow path uses a C helper
 652                  */
 653                 S390_SET  (code, s390_r2, tramp);
 654                 S390_SET  (code, s390_r1, handler_block_trampoline_helper);
 655                 s390_br   (code, s390_r1);
 656         }
 657
 658         mono_arch_flush_icache (buf, code - buf);
 659         mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
 660         g_assert (code - buf <= tramp_size);
 661
 662         *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
 663
 664         return buf;
 665 }
 666
 667 /*========================= End of Function ========================*/