mono/mini/tramp-s390x.c

   1 /**
   2  * \file
   3  * Function    - JIT trampoline code for S/390.
   4  *
   5  * Name        - Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com)
   6  *
   7  * Date        - January, 2004
   8  *
   9  * Derivation  - From exceptions-x86 & exceptions-ppc
  10  *               Paolo Molaro (lupus@ximian.com)
  11  *               Dietmar Maurer (dietmar@ximian.com)
  12  *
  13  * Copyright   - 2001 Ximian, Inc.
  14  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  15  *
  16  */
  17
  18 /*------------------------------------------------------------------*/
  19 /*                 D e f i n e s                                    */
  20 /*------------------------------------------------------------------*/
  21
  22 #define LMFReg  s390_r13
  23
  24 /*
  25  * Method-specific trampoline code fragment sizes
  26  */
  27 #define SPECIFIC_TRAMPOLINE_SIZE        96
  28
  29 /*========================= End of Defines =========================*/
  30
  31 /*------------------------------------------------------------------*/
  32 /*                 I n c l u d e s                                  */
  33 /*------------------------------------------------------------------*/
  34
  35 #include <config.h>
  36 #include <glib.h>
  37 #include <string.h>
  38
  39 #include <mono/metadata/abi-details.h>
  40 #include <mono/metadata/appdomain.h>
  41 #include <mono/metadata/gc-internals.h>
  42 #include <mono/metadata/marshal.h>
  43 #include <mono/metadata/profiler-private.h>
  44 #include <mono/metadata/tabledefs.h>
  45 #include <mono/utils/mono-hwcap.h>
  46 #include <mono/arch/s390x/s390x-codegen.h>
  47
  48 #include "mini.h"
  49 #include "mini-s390x.h"
  50 #include "mini-runtime.h"
  51 #include "support-s390x.h"
  52 #include "jit-icalls.h"
  53
  54 /*========================= End of Includes ========================*/
  55
  56 /*------------------------------------------------------------------*/
  57 /*                 T y p e d e f s                                  */
  58 /*------------------------------------------------------------------*/
  59
  60 typedef struct {
  61         guint8  stk[S390_MINIMAL_STACK_SIZE];   /* Standard s390x stack */
  62         guint64 saveFn;                         /* Call address         */
  63         struct MonoLMF  LMF;                    /* LMF                  */
  64 } trampStack_t;
  65
  66 /*========================= End of Typedefs ========================*/
  67
  68 /*------------------------------------------------------------------*/
  69 /*                   P r o t o t y p e s                            */
  70 /*------------------------------------------------------------------*/
  71
  72 /*========================= End of Prototypes ======================*/
  73
  74 /*------------------------------------------------------------------*/
  75 /*                 G l o b a l   V a r i a b l e s                  */
  76 /*------------------------------------------------------------------*/
  77
  78
  79 /*====================== End of Global Variables ===================*/
  80
  81 /*------------------------------------------------------------------*/
  82 /*                                                                  */
  83 /* Name         - mono_arch_get_unbox_trampoline                    */
  84 /*                                                                  */
  85 /* Function     - Return a pointer to a trampoline which does the   */
  86 /*                unboxing before calling the method.               */
  87 /*                                                                  */
  88 /*                When value type methods are called through the    */
  89 /*                vtable we need to unbox the 'this' argument.      */
  90 /*                                                                  */
  91 /* Parameters   - method - Methd pointer                            */
  92 /*                addr   - Pointer to native code for method        */
  93 /*                                                                  */
  94 /*------------------------------------------------------------------*/
  95
  96 gpointer
  97 mono_arch_get_unbox_trampoline (MonoMethod *method, gpointer addr)
  98 {
  99         guint8 *code, *start;
 100         int this_pos = s390_r2;
 101         MonoDomain *domain = mono_domain_get ();
 102         char trampName[128];
 103
 104         start = code = mono_domain_code_reserve (domain, 28);
 105
 106         S390_SET  (code, s390_r1, addr);
 107         s390_aghi (code, this_pos, MONO_ABI_SIZEOF (MonoObject));
 108         s390_br   (code, s390_r1);
 109
 110         g_assert ((code - start) <= 28);
 111
 112         mono_arch_flush_icache (start, code - start);
 113         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, method));
 114
 115         snprintf(trampName, sizeof(trampName), "%s_unbox_trampoline", method->name);
 116
 117         mono_tramp_info_register (mono_tramp_info_create (trampName, start, code - start, NULL, NULL), domain);
 118
 119         return start;
 120 }
 121
 122 /*========================= End of Function ========================*/
 123
 124 /*------------------------------------------------------------------*/
 125 /*                                                                  */
 126 /* Name         - mono_arch_patch_callsite                          */
 127 /*                                                                  */
 128 /* Function     - Patch a non-virtual callsite so it calls @addr.   */
 129 /*                                                                  */
 130 /*------------------------------------------------------------------*/
 131
 132 void
 133 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
 134 {
 135         gint32 displace;
 136         unsigned short opcode;
 137
 138         opcode = *((unsigned short *) (orig_code - 2));
 139         if (opcode == 0x0dee) {
 140                 /* This should be a 'iihf/iilf' sequence */
 141                 S390_EMIT_CALL((orig_code - 14), addr);
 142                 mono_arch_flush_icache (orig_code - 14, 12);
 143         } else {
 144                 /* This is the 'brasl' instruction */
 145                 orig_code    -= 4;
 146                 displace = ((gssize) addr - (gssize) (orig_code - 2)) / 2;
 147                 s390_patch_rel (orig_code, displace);
 148                 mono_arch_flush_icache (orig_code, 4);
 149         }
 150 }
 151
 152 /*========================= End of Function ========================*/
 153
 154 /*------------------------------------------------------------------*/
 155 /*                                                                  */
 156 /* Name         - mono_arch_patch_plt_entry.                        */
 157 /*                                                                  */
 158 /* Function     - Patch a PLT entry - unused as yet.                */
 159 /*                                                                  */
 160 /*------------------------------------------------------------------*/
 161
 162 void
 163 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, host_mgreg_t *regs, guint8 *addr)
 164 {
 165         g_assert_not_reached ();
 166 }
 167
 168 /*========================= End of Function ========================*/
 169
 170 /*------------------------------------------------------------------*/
 171 /*                                                                  */
 172 /* Name         - mono_arch_create_trampoline_code                  */
 173 /*                                                                  */
 174 /* Function     - Create the designated type of trampoline according*/
 175 /*                to the 'tramp_type' parameter.                    */
 176 /*                                                                  */
 177 /*------------------------------------------------------------------*/
 178
 179 guchar*
 180 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
 181 {
 182         const char *tramp_name;
 183         guint8 *buf, *tramp, *code;
 184         int i, offset, has_caller;
 185         short *o[1];
 186         GSList *unwind_ops = NULL;
 187         MonoJumpInfo *ji = NULL;
 188
 189         g_assert (!aot);
 190
 191         /* Now we'll create in 'buf' the S/390 trampoline code. This
 192            is the trampoline code common to all methods  */
 193
 194         code = buf = mono_global_codeman_reserve(512);
 195
 196         if (tramp_type == MONO_TRAMPOLINE_JUMP)
 197                 has_caller = 0;
 198         else
 199                 has_caller = 1;
 200
 201         /*-----------------------------------------------------------
 202           STEP 0: First create a non-standard function prologue with a
 203           stack size big enough to save our registers.
 204           -----------------------------------------------------------*/
 205
 206         s390_stmg (buf, s390_r6, s390_r15, STK_BASE, S390_REG_SAVE_OFFSET);
 207         s390_lgr  (buf, s390_r11, s390_r15);
 208         s390_aghi (buf, STK_BASE, -sizeof(trampStack_t));
 209         s390_stg  (buf, s390_r11, 0, STK_BASE, 0);
 210
 211         /*---------------------------------------------------------------*/
 212         /* we build the MonoLMF structure on the stack - see mini-s390.h */
 213         /* Keep in sync with the code in mono_arch_emit_prolog           */
 214         /*---------------------------------------------------------------*/
 215
 216         s390_lgr   (buf, LMFReg, STK_BASE);
 217         s390_aghi  (buf, LMFReg, G_STRUCT_OFFSET(trampStack_t, LMF));
 218
 219         /*---------------------------------------------------------------*/
 220         /* Save general and floating point registers in LMF              */
 221         /*---------------------------------------------------------------*/
 222         s390_stmg (buf, s390_r0, s390_r1, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[0]));
 223         s390_stmg (buf, s390_r2, s390_r5, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[2]));
 224         s390_mvc  (buf, 10*sizeof(gulong), LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[6]),
 225                    s390_r11, S390_REG_SAVE_OFFSET);
 226
 227         offset = G_STRUCT_OFFSET(MonoLMF, fregs[0]);
 228         for (i = s390_f0; i <= s390_f15; ++i) {
 229                 s390_std  (buf, i, 0, LMFReg, offset);
 230                 offset += sizeof(gdouble);
 231         }
 232
 233         /*----------------------------------------------------------
 234           STEP 1: call 'mono_get_lmf_addr()' to get the address of our
 235           LMF. We'll need to restore it after the call to
 236           's390_magic_trampoline' and before the call to the native
 237           method.
 238           ----------------------------------------------------------*/
 239
 240         S390_SET  (buf, s390_r1, mono_get_lmf_addr);
 241         s390_basr (buf, s390_r14, s390_r1);
 242
 243         /*---------------------------------------------------------------*/
 244         /* Set lmf.lmf_addr = jit_tls->lmf                               */
 245         /*---------------------------------------------------------------*/
 246         s390_stg   (buf, s390_r2, 0, LMFReg,
 247                             G_STRUCT_OFFSET(MonoLMF, lmf_addr));
 248
 249         /*---------------------------------------------------------------*/
 250         /* Get current lmf                                               */
 251         /*---------------------------------------------------------------*/
 252         s390_lg    (buf, s390_r0, 0, s390_r2, 0);
 253
 254         /*---------------------------------------------------------------*/
 255         /* Set our lmf as the current lmf                                */
 256         /*---------------------------------------------------------------*/
 257         s390_stg   (buf, LMFReg, 0, s390_r2, 0);
 258
 259         /*---------------------------------------------------------------*/
 260         /* Have our lmf.previous_lmf point to the last lmf               */
 261         /*---------------------------------------------------------------*/
 262         s390_stg   (buf, s390_r0, 0, LMFReg,
 263                             G_STRUCT_OFFSET(MonoLMF, previous_lmf));
 264
 265         /*---------------------------------------------------------------*/
 266         /* save method info                                              */
 267         /*---------------------------------------------------------------*/
 268         s390_lg    (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[1]));
 269         s390_stg   (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, method));
 270
 271         /*---------------------------------------------------------------*/
 272         /* save the current SP                                           */
 273         /*---------------------------------------------------------------*/
 274         s390_lg    (buf, s390_r1, 0, STK_BASE, 0);
 275         s390_stg   (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, ebp));
 276
 277         /*---------------------------------------------------------------*/
 278         /* save the current IP                                           */
 279         /*---------------------------------------------------------------*/
 280         if (has_caller) {
 281                 s390_lg    (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
 282         } else {
 283                 s390_lghi  (buf, s390_r1, 0);
 284         }
 285         s390_stg   (buf, s390_r1, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, eip));
 286
 287         /*---------------------------------------------------------------*/
 288         /* STEP 2: call the C trampoline function                        */
 289         /*---------------------------------------------------------------*/
 290
 291         /* Set arguments */
 292
 293         /* Arg 1: host_mgreg_t *regs */
 294         s390_la  (buf, s390_r2, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[0]));
 295
 296         /* Arg 2: code (next address to the instruction that called us) */
 297         if (has_caller) {
 298                 s390_lg   (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
 299         } else {
 300                 s390_lghi (buf, s390_r3, 0);
 301         }
 302
 303         /* Arg 3: Trampoline argument */
 304         s390_lg (buf, s390_r4, 0, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[1]));
 305
 306         /* Arg 4: trampoline address. */
 307         S390_SET (buf, s390_r5, buf);
 308
 309         /* Calculate call address and call the C trampoline. Return value will be in r2 */
 310         tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 311         S390_SET  (buf, s390_r1, tramp);
 312         s390_basr (buf, s390_r14, s390_r1);
 313
 314         /* OK, code address is now on r2. Save it, so that we
 315            can restore r2 and use it later */
 316         s390_stg  (buf, s390_r2, 0, STK_BASE, G_STRUCT_OFFSET(trampStack_t, saveFn));
 317
 318         /*----------------------------------------------------------
 319           STEP 3: Restore the LMF
 320           ----------------------------------------------------------*/
 321         restoreLMF(buf, STK_BASE, sizeof(trampStack_t));
 322
 323         /* Check for thread interruption */
 324         S390_SET  (buf, s390_r1, (guint8 *)mono_thread_force_interruption_checkpoint_noraise);
 325         s390_basr (buf, s390_r14, s390_r1);
 326         s390_ltgr (buf, s390_r2, s390_r2);
 327         s390_jz   (buf, 0); CODEPTR (buf, o[0]);
 328
 329         /*
 330          * Exception case:
 331          * We have an exception we want to throw in the caller's frame, so pop
 332          * the trampoline frame and throw from the caller.
 333          */
 334         S390_SET  (buf, s390_r1, (guint *)mono_get_rethrow_preserve_exception_addr ());
 335         s390_aghi (buf, STK_BASE, sizeof(trampStack_t));
 336         s390_lg   (buf, s390_r1, 0, s390_r1, 0);
 337         s390_lmg  (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 338         s390_br   (buf, s390_r1);
 339         PTRSLOT (buf, o[0]);
 340
 341         /* Reload result */
 342         s390_lg   (buf, s390_r1, 0, STK_BASE, G_STRUCT_OFFSET(trampStack_t, saveFn));
 343
 344         /*----------------------------------------------------------
 345           STEP 4: call the compiled method
 346           ----------------------------------------------------------*/
 347
 348         /* Restore parameter registers */
 349         s390_lmg (buf, s390_r2, s390_r5, LMFReg, G_STRUCT_OFFSET(MonoLMF, gregs[2]));
 350
 351         /* Restore the FP registers */
 352         offset = G_STRUCT_OFFSET(MonoLMF, fregs[0]);
 353         for (i = s390_f0; i <= s390_f15; ++i) {
 354                 s390_ld  (buf, i, 0, LMFReg, offset);
 355                 offset += sizeof(gdouble);
 356         }
 357
 358         /* Restore stack pointer and jump to the code -
 359          * R14 contains the return address to our caller
 360          */
 361         s390_lgr  (buf, STK_BASE, s390_r11);
 362         s390_lmg  (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 363
 364         if (MONO_TRAMPOLINE_TYPE_MUST_RETURN(tramp_type)) {
 365                 s390_lgr (buf, s390_r2, s390_r1);
 366                 s390_br  (buf, s390_r14);
 367         } else {
 368                 s390_br  (buf, s390_r1);
 369         }
 370
 371         /* Flush instruction cache, since we've generated code */
 372         mono_arch_flush_icache (code, buf - code);
 373         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 374
 375         g_assert (info);
 376         tramp_name = mono_get_generic_trampoline_name (tramp_type);
 377         *info = mono_tramp_info_create (tramp_name, buf, buf - code, ji, unwind_ops);
 378
 379         /* Sanity check */
 380         g_assert ((buf - code) <= 512);
 381
 382         return code;
 383 }
 384
 385 /*========================= End of Function ========================*/
 386
 387 /*------------------------------------------------------------------*/
 388 /*                                                                  */
 389 /* Name         - mono_arch_invalidate_method                       */
 390 /*                                                                  */
 391 /* Function     -                                                   */
 392 /*                                                                  */
 393 /*------------------------------------------------------------------*/
 394
 395 void
 396 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
 397 {
 398         /* FIXME: This is not thread safe */
 399         guint8 *code = ji->code_start;
 400
 401         S390_SET  (code, s390_r1, func);
 402         S390_SET  (code, s390_r2, func_arg);
 403         s390_br   (code, s390_r1);
 404
 405 }
 406
 407 /*========================= End of Function ========================*/
 408
 409 /*------------------------------------------------------------------*/
 410 /*                                                                  */
 411 /* Name         - mono_arch_create_specific_trampoline              */
 412 /*                                                                  */
 413 /* Function     - Creates the given kind of specific trampoline     */
 414 /*                                                                  */
 415 /*------------------------------------------------------------------*/
 416
 417 gpointer
 418 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 419 {
 420         guint8 *code, *buf, *tramp;
 421         gint32 displace;
 422
 423         tramp = mono_get_trampoline_code (tramp_type);
 424
 425         /*----------------------------------------------------------*/
 426         /* This is the method-specific part of the trampoline. Its  */
 427         /* purpose is to provide the generic part with the          */
 428         /* MonoMethod *method pointer. We'll use r1 to keep it.     */
 429         /*----------------------------------------------------------*/
 430         code = buf = mono_domain_code_reserve (domain, SPECIFIC_TRAMPOLINE_SIZE);
 431
 432         S390_SET  (buf, s390_r1, arg1);
 433         displace = (tramp - buf) / 2;
 434         s390_jg   (buf, displace);
 435
 436         /* Flush instruction cache, since we've generated code */
 437         mono_arch_flush_icache (code, buf - code);
 438         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf,
 439                              MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE,
 440                              (void *) mono_get_generic_trampoline_simple_name (tramp_type)));
 441
 442         /* Sanity check */
 443         g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
 444
 445         if (code_len)
 446                 *code_len = buf - code;
 447
 448         return code;
 449 }
 450
 451 /*========================= End of Function ========================*/
 452
 453 /*------------------------------------------------------------------*/
 454 /*                                                                  */
 455 /* Name         - mono_arch_create_rgctx_lazy_fetch_trampoline      */
 456 /*                                                                  */
 457 /* Function     -                                                   */
 458 /*                                                                  */
 459 /*------------------------------------------------------------------*/
 460
 461 gpointer
 462 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 463 {
 464         guint8 *tramp;
 465         guint8 *code, *buf;
 466         guint8 **rgctx_null_jumps;
 467         gint32 displace;
 468         int tramp_size,
 469             depth,
 470             index,
 471             iPatch = 0,
 472             i;
 473         gboolean mrgctx;
 474         MonoJumpInfo *ji = NULL;
 475         GSList *unwind_ops = NULL;
 476
 477         mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 478         index = MONO_RGCTX_SLOT_INDEX (slot);
 479         if (mrgctx)
 480                 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (target_mgreg_t);
 481         for (depth = 0; ; ++depth) {
 482                 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
 483
 484                 if (index < size - 1)
 485                         break;
 486                 index -= size - 1;
 487         }
 488
 489         tramp_size = 48 + 16 * depth;
 490         if (mrgctx)
 491                 tramp_size += 4;
 492         else
 493                 tramp_size += 12;
 494
 495         code = buf = mono_global_codeman_reserve (tramp_size);
 496
 497         unwind_ops = mono_arch_get_cie_program ();
 498
 499         rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
 500
 501         if (mrgctx) {
 502                 /* get mrgctx ptr */
 503                 s390_lgr (code, s390_r1, s390_r2);
 504         } else {
 505                 /* load rgctx ptr from vtable */
 506                 s390_lg (code, s390_r1, 0, s390_r2, MONO_STRUCT_OFFSET(MonoVTable, runtime_generic_context));
 507                 /* is the rgctx ptr null? */
 508                 s390_ltgr (code, s390_r1, s390_r1);
 509                 /* if yes, jump to actual trampoline */
 510                 rgctx_null_jumps [iPatch++] = code;
 511                 s390_jge (code, 0);
 512         }
 513
 514         for (i = 0; i < depth; ++i) {
 515                 /* load ptr to next array */
 516                 if (mrgctx && i == 0)
 517                         s390_lg (code, s390_r1, 0, s390_r1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
 518                 else
 519                         s390_lg (code, s390_r1, 0, s390_r1, 0);
 520                 s390_ltgr (code, s390_r1, s390_r1);
 521                 /* if the ptr is null then jump to actual trampoline */
 522                 rgctx_null_jumps [iPatch++] = code;
 523                 s390_jge (code, 0);
 524         }
 525
 526         /* fetch slot */
 527         s390_lg (code, s390_r1, 0, s390_r1, (sizeof (target_mgreg_t) * (index  + 1)));
 528         /* is the slot null? */
 529         s390_ltgr (code, s390_r1, s390_r1);
 530         /* if yes, jump to actual trampoline */
 531         rgctx_null_jumps [iPatch++] = code;
 532         s390_jge (code, 0);
 533         /* otherwise return r1 */
 534         s390_lgr (code, s390_r2, s390_r1);
 535         s390_br  (code, s390_r14);
 536
 537         for (i = 0; i < iPatch; i++) {
 538                 displace = ((uintptr_t) code - (uintptr_t) rgctx_null_jumps[i]) / 2;
 539                 s390_patch_rel ((rgctx_null_jumps [i] + 2), displace);
 540         }
 541
 542         g_free (rgctx_null_jumps);
 543
 544         /* move the rgctx pointer to the VTABLE register */
 545 #if MONO_ARCH_VTABLE_REG != s390_r2
 546         s390_lgr (code, MONO_ARCH_VTABLE_REG, s390_r2);
 547 #endif
 548
 549         tramp = (guint8*)mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot),
 550                 MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
 551
 552         /* jump to the actual trampoline */
 553         displace = (tramp - code) / 2;
 554         s390_jg (code, displace);
 555
 556         mono_arch_flush_icache (buf, code - buf);
 557         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 558
 559         g_assert (code - buf <= tramp_size);
 560
 561         char *name = mono_get_rgctx_fetch_trampoline_name (slot);
 562         *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
 563         g_free (name);
 564
 565         return(buf);
 566 }
 567
 568 /*========================= End of Function ========================*/
 569
 570 /*------------------------------------------------------------------*/
 571 /*                                                                  */
 572 /* Name         - mono_arch_get_static_rgctx_trampoline             */
 573 /*                                                                  */
 574 /* Function     - Create a trampoline which sets RGCTX_REG to ARG       */
 575 /*                then jumps to ADDR.                               */
 576 /*                                                                  */
 577 /*------------------------------------------------------------------*/
 578
 579 gpointer
 580 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
 581 {
 582         guint8 *code, *start;
 583         gint32 displace;
 584         int buf_len;
 585
 586         MonoDomain *domain = mono_domain_get ();
 587
 588         buf_len = 32;
 589
 590         start = code = mono_domain_code_reserve (domain, buf_len);
 591
 592         S390_SET  (code, MONO_ARCH_RGCTX_REG, arg);
 593         displace = ((uintptr_t) addr - (uintptr_t) code) / 2;
 594         s390_jg   (code, displace);
 595         g_assert ((code - start) < buf_len);
 596
 597         mono_arch_flush_icache (start, code - start);
 598         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 599
 600         mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, NULL), domain);
 601
 602         return(start);
 603 }
 604
 605 /*========================= End of Function ========================*/