mono/mini/tramp-amd64.c

   1 /*
   2  * tramp-amd64.c: JIT trampoline code for amd64
   3  *
   4  * Authors:
   5  *   Dietmar Maurer (dietmar@ximian.com)
   6  *   Zoltan Varga (vargaz@gmail.com)
   7  *
   8  * (C) 2001 Ximian, Inc.
   9  */
  10
  11 #include <config.h>
  12 #include <glib.h>
  13
  14 #include <mono/metadata/appdomain.h>
  15 #include <mono/metadata/marshal.h>
  16 #include <mono/metadata/tabledefs.h>
  17 #include <mono/metadata/mono-debug-debugger.h>
  18 #include <mono/metadata/monitor.h>
  19 #include <mono/metadata/monitor.h>
  20 #include <mono/metadata/gc-internal.h>
  21 #include <mono/arch/amd64/amd64-codegen.h>
  22
  23 #include <mono/utils/memcheck.h>
  24
  25 #include "mini.h"
  26 #include "mini-amd64.h"
  27
  28 #if defined(__native_client_codegen__) && defined(__native_client__)
  29 #include <malloc.h>
  30 #include <sys/nacl_syscalls.h>
  31 #endif
  32
  33 #define IS_REX(inst) (((inst) >= 0x40) && ((inst) <= 0x4f))
  34
  35 static guint8* nullified_class_init_trampoline;
  36
  37 /*
  38  * mono_arch_get_unbox_trampoline:
  39  * @m: method pointer
  40  * @addr: pointer to native code for @m
  41  *
  42  * when value type methods are called through the vtable we need to unbox the
  43  * this argument. This method returns a pointer to a trampoline which does
  44  * unboxing before calling the method
  45  */
  46 gpointer
  47 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
  48 {
  49         guint8 *code, *start;
  50         int this_reg;
  51
  52         MonoDomain *domain = mono_domain_get ();
  53
  54         this_reg = mono_arch_get_this_arg_reg (NULL);
  55
  56         start = code = mono_domain_code_reserve (domain, 20);
  57
  58         amd64_alu_reg_imm (code, X86_ADD, this_reg, sizeof (MonoObject));
  59         /* FIXME: Optimize this */
  60         amd64_mov_reg_imm (code, AMD64_RAX, addr);
  61         amd64_jump_reg (code, AMD64_RAX);
  62         g_assert ((code - start) < 20);
  63
  64         nacl_domain_code_validate (domain, &start, 20, &code);
  65
  66         mono_arch_flush_icache (start, code - start);
  67
  68         return start;
  69 }
  70
  71 /*
  72  * mono_arch_get_static_rgctx_trampoline:
  73  *
  74  *   Create a trampoline which sets RGCTX_REG to MRGCTX, then jumps to ADDR.
  75  */
  76 gpointer
  77 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
  78 {
  79         guint8 *code, *start;
  80         int buf_len;
  81
  82         MonoDomain *domain = mono_domain_get ();
  83
  84 #ifdef MONO_ARCH_NOMAP32BIT
  85         buf_len = 32;
  86 #else
  87         /* AOTed code could still have a non-32 bit address */
  88         if ((((guint64)addr) >> 32) == 0)
  89                 buf_len = 16;
  90         else
  91                 buf_len = 30;
  92 #endif
  93
  94         start = code = mono_domain_code_reserve (domain, buf_len);
  95
  96         amd64_mov_reg_imm (code, MONO_ARCH_RGCTX_REG, mrgctx);
  97         amd64_jump_code (code, addr);
  98         g_assert ((code - start) < buf_len);
  99
 100         nacl_domain_code_validate (domain, &start, buf_len, &code);
 101         mono_arch_flush_icache (start, code - start);
 102
 103         return start;
 104 }
 105
 106 gpointer
 107 mono_arch_get_llvm_imt_trampoline (MonoDomain *domain, MonoMethod *m, int vt_offset)
 108 {
 109         guint8 *code, *start;
 110         int buf_len;
 111         int this_reg;
 112
 113         buf_len = 32;
 114
 115         start = code = mono_domain_code_reserve (domain, buf_len);
 116
 117         this_reg = mono_arch_get_this_arg_reg (NULL);
 118
 119         /* Set imt arg */
 120         amd64_mov_reg_imm (code, MONO_ARCH_IMT_REG, m);
 121         /* Load vtable address */
 122         amd64_mov_reg_membase (code, AMD64_RAX, this_reg, 0, 8);
 123         amd64_jump_membase (code, AMD64_RAX, vt_offset);
 124         amd64_ret (code);
 125
 126         g_assert ((code - start) < buf_len);
 127
 128         nacl_domain_code_validate (domain, &start, buf_len, &code);
 129
 130         mono_arch_flush_icache (start, code - start);
 131
 132         return start;
 133 }
 134
 135 /*
 136  * mono_arch_patch_callsite:
 137  *
 138  *   Patch the callsite whose address is given by ORIG_CODE so it calls ADDR. ORIG_CODE
 139  * points to the pc right after the call.
 140  */
 141 void
 142 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
 143 {
 144 #if defined(__default_codegen__)
 145         guint8 *code;
 146         guint8 buf [16];
 147         gboolean can_write = mono_breakpoint_clean_code (method_start, orig_code, 14, buf, sizeof (buf));
 148
 149         code = buf + 14;
 150
 151         /* mov 64-bit imm into r11 (followed by call reg?)  or direct call*/
 152         if (((code [-13] == 0x49) && (code [-12] == 0xbb)) || (code [-5] == 0xe8)) {
 153                 if (code [-5] != 0xe8) {
 154                         if (can_write) {
 155                                 InterlockedExchangePointer ((gpointer*)(orig_code - 11), addr);
 156                                 VALGRIND_DISCARD_TRANSLATIONS (orig_code - 11, sizeof (gpointer));
 157                         }
 158                 } else {
 159                         if ((((guint64)(addr)) >> 32) != 0) {
 160 #ifdef MONO_ARCH_NOMAP32BIT
 161                                 /* Print some diagnostics */
 162                                 MonoJitInfo *ji = mono_jit_info_table_find (mono_domain_get (), (char*)orig_code);
 163                                 if (ji)
 164                                         fprintf (stderr, "At %s, offset 0x%zx\n", mono_method_full_name (ji->method, TRUE), (guint8*)orig_code - (guint8*)ji->code_start);
 165                                 fprintf (stderr, "Addr: %p\n", addr);
 166                                 ji = mono_jit_info_table_find (mono_domain_get (), (char*)addr);
 167                                 if (ji)
 168                                         fprintf (stderr, "Callee: %s\n", mono_method_full_name (ji->method, TRUE));
 169                                 g_assert_not_reached ();
 170 #else
 171                                 /*
 172                                  * This might happen when calling AOTed code. Create a thunk.
 173                                  */
 174                                 guint8 *thunk_start, *thunk_code;
 175
 176                                 thunk_start = thunk_code = mono_domain_code_reserve (mono_domain_get (), 32);
 177                                 amd64_jump_membase (thunk_code, AMD64_RIP, 0);
 178                                 *(guint64*)thunk_code = (guint64)addr;
 179                                 addr = thunk_start;
 180                                 g_assert ((((guint64)(addr)) >> 32) == 0);
 181                                 mono_arch_flush_icache (thunk_start, thunk_code - thunk_start);
 182 #endif
 183                         }
 184                         g_assert ((((guint64)(orig_code)) >> 32) == 0);
 185                         if (can_write) {
 186                                 InterlockedExchange ((gint32*)(orig_code - 4), ((gint64)addr - (gint64)orig_code));
 187                                 VALGRIND_DISCARD_TRANSLATIONS (orig_code - 5, 4);
 188                         }
 189                 }
 190         }
 191         else if ((code [-7] == 0x41) && (code [-6] == 0xff) && (code [-5] == 0x15)) {
 192                 /* call *<OFFSET>(%rip) */
 193                 gpointer *got_entry = (gpointer*)((guint8*)orig_code + (*(guint32*)(orig_code - 4)));
 194                 if (can_write) {
 195                         InterlockedExchangePointer (got_entry, addr);
 196                         VALGRIND_DISCARD_TRANSLATIONS (orig_code - 5, sizeof (gpointer));
 197                 }
 198         }
 199 #elif defined(__native_client__)
 200         /* These are essentially the same 2 cases as above, modified for NaCl*/
 201
 202         /* Target must be bundle-aligned */
 203         g_assert (((guint32)addr & kNaClAlignmentMask) == 0);
 204         /* Return target must be bundle-aligned */
 205         g_assert (((guint32)orig_code & kNaClAlignmentMask) == 0);
 206
 207         if (orig_code[-5] == 0xe8) {
 208                 /* Direct call */
 209                 int ret;
 210                 gint32 offset = (gint32)addr - (gint32)orig_code;
 211                 guint8 buf[sizeof(gint32)];
 212                 *((gint32*)(buf)) = offset;
 213                 ret = nacl_dyncode_modify (orig_code - sizeof(gint32), buf, sizeof(gint32));
 214                 g_assert (ret == 0);
 215         }
 216
 217         else if (is_nacl_call_reg_sequence (orig_code - 10) && orig_code[-16] == 0x41 && orig_code[-15] == 0xbb) {
 218                 int ret;
 219                 guint8 buf[sizeof(gint32)];
 220                 *((gint32 *)(buf)) = addr;
 221                 /* orig_code[-14] is the start of the immediate. */
 222                 ret = nacl_dyncode_modify (orig_code - 14, buf, sizeof(gint32));
 223                 g_assert (ret == 0);
 224         }
 225         else {
 226                 g_assert_not_reached ();
 227         }
 228
 229         return;
 230 #endif
 231 }
 232
 233 void
 234 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
 235 {
 236         gint32 disp;
 237         gpointer *plt_jump_table_entry;
 238
 239 #if defined(__default_codegen__)
 240         /* A PLT entry: jmp *<DISP>(%rip) */
 241         g_assert (code [0] == 0xff);
 242         g_assert (code [1] == 0x25);
 243
 244         disp = *(gint32*)(code + 2);
 245
 246         plt_jump_table_entry = (gpointer*)(code + 6 + disp);
 247 #elif defined(__native_client_codegen__)
 248         /* A PLT entry:            */
 249         /* mov <DISP>(%rip), %r11d */
 250         /* nacljmp *%r11           */
 251
 252         /* Verify the 'mov' */
 253         g_assert (code [0] == 0x45);
 254         g_assert (code [1] == 0x8b);
 255         g_assert (code [2] == 0x1d);
 256
 257         disp = *(gint32*)(code + 3);
 258
 259         /* 7 = 3 (mov opcode) + 4 (disp) */
 260         /* This needs to resolve to the target of the RIP-relative offset */
 261         plt_jump_table_entry = (gpointer*)(code + 7 + disp);
 262
 263 #endif /* __native_client_codegen__ */
 264
 265
 266         InterlockedExchangePointer (plt_jump_table_entry, addr);
 267 }
 268
 269 static gpointer
 270 get_vcall_slot (guint8 *code, mgreg_t *regs, int *displacement)
 271 {
 272         guint8 buf [10];
 273         gint32 disp;
 274         MonoJitInfo *ji = NULL;
 275
 276 #ifdef ENABLE_LLVM
 277         /* code - 9 might be before the start of the method */
 278         /* FIXME: Avoid this expensive call somehow */
 279         ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
 280 #endif
 281
 282         mono_breakpoint_clean_code (ji ? ji->code_start : NULL, code, 9, buf, sizeof (buf));
 283         code = buf + 9;
 284
 285         *displacement = 0;
 286
 287         code -= 7;
 288
 289         if ((code [0] == 0x41) && (code [1] == 0xff) && (code [2] == 0x15)) {
 290                 /* call OFFSET(%rip) */
 291                 g_assert_not_reached ();
 292                 *displacement = *(guint32*)(code + 3);
 293                 return (gpointer*)(code + disp + 7);
 294         } else {
 295                 g_assert_not_reached ();
 296                 return NULL;
 297         }
 298 }
 299
 300 static gpointer*
 301 get_vcall_slot_addr (guint8* code, mgreg_t *regs)
 302 {
 303         gpointer vt;
 304         int displacement;
 305         vt = get_vcall_slot (code, regs, &displacement);
 306         if (!vt)
 307                 return NULL;
 308         return (gpointer*)((char*)vt + displacement);
 309 }
 310
 311 void
 312 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
 313 {
 314         guint8 buf [16];
 315         MonoJitInfo *ji = NULL;
 316         gboolean can_write;
 317
 318         if (mono_use_llvm) {
 319                 /* code - 7 might be before the start of the method */
 320                 /* FIXME: Avoid this expensive call somehow */
 321                 ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
 322         }
 323
 324         can_write = mono_breakpoint_clean_code (ji ? ji->code_start : NULL, code, 7, buf, sizeof (buf));
 325
 326         if (!can_write)
 327                 return;
 328
 329         /*
 330          * A given byte sequence can match more than case here, so we have to be
 331          * really careful about the ordering of the cases. Longer sequences
 332          * come first.
 333          */
 334         if ((buf [0] == 0x41) && (buf [1] == 0xff) && (buf [2] == 0x15)) {
 335                 gpointer *vtable_slot;
 336
 337                 /* call *<OFFSET>(%rip) */
 338                 vtable_slot = get_vcall_slot_addr (code, regs);
 339                 g_assert (vtable_slot);
 340
 341                 *vtable_slot = nullified_class_init_trampoline;
 342         } else if (buf [2] == 0xe8) {
 343                 /* call <TARGET> */
 344                 //guint8 *buf = code - 2;
 345
 346                 /*
 347                  * It would be better to replace the call with nops, but that doesn't seem
 348                  * to work on SMP machines even when the whole call is inside a cache line.
 349                  * Patching the call address seems to work.
 350                  */
 351                 /*
 352                 buf [0] = 0x66;
 353                 buf [1] = 0x66;
 354                 buf [2] = 0x90;
 355                 buf [3] = 0x66;
 356                 buf [4] = 0x90;
 357                 */
 358
 359                 mono_arch_patch_callsite (code - 5, code, nullified_class_init_trampoline);
 360         } else if ((buf [5] == 0xff) && x86_modrm_mod (buf [6]) == 3 && x86_modrm_reg (buf [6]) == 2) {
 361                 /* call *<reg> */
 362                 /* Generated by the LLVM JIT or on platforms without MAP_32BIT set */
 363                 mono_arch_patch_callsite (code - 13, code, nullified_class_init_trampoline);
 364         } else if (buf [4] == 0x90 || buf [5] == 0xeb || buf [6] == 0x66) {
 365                 /* Already changed by another thread */
 366                 ;
 367         } else {
 368                 printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", buf [0], buf [1], buf [2], buf [3],
 369                         buf [4], buf [5], buf [6]);
 370                 g_assert_not_reached ();
 371         }
 372 }
 373
 374 void
 375 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
 376 {
 377         if (mono_aot_only && !nullified_class_init_trampoline)
 378                 nullified_class_init_trampoline = mono_aot_get_trampoline ("nullified_class_init_trampoline");
 379
 380         mono_arch_patch_plt_entry (code, NULL, regs, nullified_class_init_trampoline);
 381 }
 382
 383 guchar*
 384 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
 385 {
 386         guint8 *buf, *code, *tramp, *br [2], *r11_save_code, *after_r11_save_code;
 387         int i, lmf_offset, offset, res_offset, arg_offset, rax_offset, tramp_offset, saved_regs_offset;
 388         int saved_fpregs_offset, rbp_offset, framesize, orig_rsp_to_rbp_offset, cfa_offset;
 389         gboolean has_caller;
 390         GSList *unwind_ops = NULL;
 391         MonoJumpInfo *ji = NULL;
 392         const guint kMaxCodeSize = NACL_SIZE (548, 548*2);
 393
 394 #if defined(__native_client_codegen__)
 395         const guint kNaClTrampOffset = 17;
 396 #endif
 397
 398         if (tramp_type == MONO_TRAMPOLINE_JUMP)
 399                 has_caller = FALSE;
 400         else
 401                 has_caller = TRUE;
 402
 403         code = buf = mono_global_codeman_reserve (kMaxCodeSize);
 404
 405         framesize = kMaxCodeSize + sizeof (MonoLMF);
 406         framesize = (framesize + (MONO_ARCH_FRAME_ALIGNMENT - 1)) & ~ (MONO_ARCH_FRAME_ALIGNMENT - 1);
 407
 408         orig_rsp_to_rbp_offset = 0;
 409         r11_save_code = code;
 410         /* Reserve 5 bytes for the mov_membase_reg to save R11 */
 411         code += 5;
 412         after_r11_save_code = code;
 413
 414         // CFA = sp + 16 (the trampoline address is on the stack)
 415         cfa_offset = 16;
 416         mono_add_unwind_op_def_cfa (unwind_ops, code, buf, AMD64_RSP, 16);
 417         // IP saved at CFA - 8
 418         mono_add_unwind_op_offset (unwind_ops, code, buf, AMD64_RIP, -8);
 419
 420         /* Pop the return address off the stack */
 421         amd64_pop_reg (code, AMD64_R11);
 422         orig_rsp_to_rbp_offset += sizeof(mgreg_t);
 423
 424         cfa_offset -= sizeof(mgreg_t);
 425         mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
 426
 427         /*
 428          * Allocate a new stack frame
 429          */
 430         amd64_push_reg (code, AMD64_RBP);
 431         cfa_offset += sizeof(mgreg_t);
 432         mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
 433         mono_add_unwind_op_offset (unwind_ops, code, buf, AMD64_RBP, - cfa_offset);
 434
 435         orig_rsp_to_rbp_offset -= sizeof(mgreg_t);
 436         amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, sizeof(mgreg_t));
 437         mono_add_unwind_op_def_cfa_reg (unwind_ops, code, buf, AMD64_RBP);
 438         amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, framesize);
 439
 440         offset = 0;
 441         rbp_offset = - offset;
 442
 443         offset += sizeof(mgreg_t);
 444         rax_offset = - offset;
 445
 446         offset += sizeof(mgreg_t);
 447         tramp_offset = - offset;
 448
 449         offset += sizeof(gpointer);
 450         arg_offset = - offset;
 451
 452         /* Compute the trampoline address from the return address */
 453         if (aot) {
 454 #if defined(__default_codegen__)
 455                 /* 7 = length of call *<offset>(rip) */
 456                 amd64_alu_reg_imm (code, X86_SUB, AMD64_R11, 7);
 457 #elif defined(__native_client_codegen__)
 458                 amd64_alu_reg_imm (code, X86_SUB, AMD64_R11, kNaClTrampOffset);
 459 #endif
 460         } else {
 461                 /* 5 = length of amd64_call_membase () */
 462                 amd64_alu_reg_imm (code, X86_SUB, AMD64_R11, 5);
 463         }
 464         amd64_mov_membase_reg (code, AMD64_RBP, tramp_offset, AMD64_R11, sizeof(gpointer));
 465
 466         offset += sizeof(mgreg_t);
 467         res_offset = - offset;
 468
 469         /* Save all registers */
 470
 471         offset += AMD64_NREG * sizeof(mgreg_t);
 472         saved_regs_offset = - offset;
 473         for (i = 0; i < AMD64_NREG; ++i) {
 474                 if (i == AMD64_RBP) {
 475                         /* RAX is already saved */
 476                         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RBP, rbp_offset, sizeof(mgreg_t));
 477                         amd64_mov_membase_reg (code, AMD64_RBP, saved_regs_offset + (i * sizeof(mgreg_t)), AMD64_RAX, sizeof(mgreg_t));
 478                 } else if (i != AMD64_R11) {
 479                         amd64_mov_membase_reg (code, AMD64_RBP, saved_regs_offset + (i * sizeof(mgreg_t)), i, sizeof(mgreg_t));
 480                 } else {
 481                         /* We have to save R11 right at the start of
 482                            the trampoline code because it's used as a
 483                            scratch register */
 484                         amd64_mov_membase_reg (r11_save_code, AMD64_RSP, saved_regs_offset + orig_rsp_to_rbp_offset + (i * sizeof(mgreg_t)), i, sizeof(mgreg_t));
 485                         g_assert (r11_save_code == after_r11_save_code);
 486                 }
 487         }
 488         offset += 8 * sizeof(mgreg_t);
 489         saved_fpregs_offset = - offset;
 490         for (i = 0; i < 8; ++i)
 491                 amd64_movsd_membase_reg (code, AMD64_RBP, saved_fpregs_offset + (i * sizeof(mgreg_t)), i);
 492
 493         if (tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT &&
 494                         tramp_type != MONO_TRAMPOLINE_MONITOR_ENTER &&
 495                         tramp_type != MONO_TRAMPOLINE_MONITOR_EXIT) {
 496                 /* Obtain the trampoline argument which is encoded in the instruction stream */
 497                 if (aot) {
 498                         /* Load the GOT offset */
 499                         amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, tramp_offset, sizeof(gpointer));
 500 #if defined(__default_codegen__)
 501                         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, 7, 4);
 502 #elif defined(__native_client_codegen__)
 503                         /* The arg is hidden in a "push imm32" instruction, */
 504                         /* add one to skip the opcode.                      */
 505                         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, kNaClTrampOffset+1, 4);
 506 #endif
 507                         /* Compute the address of the GOT slot */
 508                         amd64_alu_reg_reg_size (code, X86_ADD, AMD64_R11, AMD64_RAX, sizeof(gpointer));
 509                         /* Load the value */
 510                         amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, 0, sizeof(gpointer));
 511                 } else {
 512                         amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, tramp_offset, sizeof(gpointer));
 513 #if defined(__default_codegen__)
 514                         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, 5, 1);
 515                         amd64_widen_reg (code, AMD64_RAX, AMD64_RAX, TRUE, FALSE);
 516                         amd64_alu_reg_imm_size (code, X86_CMP, AMD64_RAX, 4, 1);
 517                         br [0] = code;
 518                         x86_branch8 (code, X86_CC_NE, 6, FALSE);
 519                         /* 32 bit immediate */
 520                         amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, 6, 4);
 521                         br [1] = code;
 522                         x86_jump8 (code, 10);
 523                         /* 64 bit immediate */
 524                         mono_amd64_patch (br [0], code);
 525                         amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, 6, 8);
 526                         mono_amd64_patch (br [1], code);
 527 #elif defined(__native_client_codegen__)
 528                         /* All args are 32-bit pointers in NaCl */
 529                         amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, 6, 4);
 530 #endif
 531                 }
 532                 amd64_mov_membase_reg (code, AMD64_RBP, arg_offset, AMD64_R11, sizeof(gpointer));
 533         } else {
 534                 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, saved_regs_offset + (MONO_AMD64_ARG_REG1 * sizeof(mgreg_t)), sizeof(mgreg_t));
 535                 amd64_mov_membase_reg (code, AMD64_RBP, arg_offset, AMD64_R11, sizeof(gpointer));
 536         }
 537
 538         /* Save LMF begin */
 539
 540         offset += sizeof (MonoLMF);
 541         lmf_offset = - offset;
 542
 543         /* Save ip */
 544         if (has_caller)
 545                 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, 8, sizeof(gpointer));
 546         else
 547                 amd64_mov_reg_imm (code, AMD64_R11, 0);
 548         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rip), AMD64_R11, sizeof(mgreg_t));
 549         /* Save fp */
 550         amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, framesize, sizeof(mgreg_t));
 551         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rbp), AMD64_R11, sizeof(mgreg_t));
 552         /* Save sp */
 553         amd64_mov_reg_reg (code, AMD64_R11, AMD64_RSP, sizeof(mgreg_t));
 554         amd64_alu_reg_imm (code, X86_ADD, AMD64_R11, framesize + 16);
 555         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rsp), AMD64_R11, sizeof(mgreg_t));
 556         /* Save method */
 557         if (tramp_type == MONO_TRAMPOLINE_JIT || tramp_type == MONO_TRAMPOLINE_JUMP) {
 558                 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, arg_offset, sizeof(gpointer));
 559                 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, method), AMD64_R11, sizeof(gpointer));
 560         } else {
 561                 amd64_mov_membase_imm (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, method), 0, sizeof(gpointer));
 562         }
 563         /* Save callee saved regs */
 564 #ifdef TARGET_WIN32
 565         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rdi), AMD64_RDI, sizeof(mgreg_t));
 566         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rsi), AMD64_RSI, sizeof(mgreg_t));
 567 #endif
 568         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rbx), AMD64_RBX, sizeof(mgreg_t));
 569         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r12), AMD64_R12, sizeof(mgreg_t));
 570         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r13), AMD64_R13, sizeof(mgreg_t));
 571         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r14), AMD64_R14, sizeof(mgreg_t));
 572         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r15), AMD64_R15, sizeof(mgreg_t));
 573
 574         if (aot) {
 575                 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
 576         } else {
 577                 amd64_mov_reg_imm (code, AMD64_R11, mono_get_lmf_addr);
 578         }
 579         amd64_call_reg (code, AMD64_R11);
 580
 581         /* Save lmf_addr */
 582         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, lmf_addr), AMD64_RAX, sizeof(gpointer));
 583         /* Save previous_lmf */
 584         /* Set the lowest bit to 1 to signal that this LMF has the ip field set */
 585         amd64_mov_reg_membase (code, AMD64_R11, AMD64_RAX, 0, sizeof(gpointer));
 586         amd64_alu_reg_imm_size (code, X86_ADD, AMD64_R11, 1, sizeof(gpointer));
 587         amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, previous_lmf), AMD64_R11, sizeof(gpointer));
 588         /* Set new lmf */
 589         amd64_lea_membase (code, AMD64_R11, AMD64_RBP, lmf_offset);
 590         amd64_mov_membase_reg (code, AMD64_RAX, 0, AMD64_R11, sizeof(gpointer));
 591
 592         /* Save LMF end */
 593
 594         /* Arg1 is the pointer to the saved registers */
 595         amd64_lea_membase (code, AMD64_ARG_REG1, AMD64_RBP, saved_regs_offset);
 596
 597         /* Arg2 is the address of the calling code */
 598         if (has_caller)
 599                 amd64_mov_reg_membase (code, AMD64_ARG_REG2, AMD64_RBP, 8, sizeof(gpointer));
 600         else
 601                 amd64_mov_reg_imm (code, AMD64_ARG_REG2, 0);
 602
 603         /* Arg3 is the method/vtable ptr */
 604         amd64_mov_reg_membase (code, AMD64_ARG_REG3, AMD64_RBP, arg_offset, sizeof(gpointer));
 605
 606         /* Arg4 is the trampoline address */
 607         amd64_mov_reg_membase (code, AMD64_ARG_REG4, AMD64_RBP, tramp_offset, sizeof(gpointer));
 608
 609         if (aot) {
 610                 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
 611                 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
 612         } else {
 613                 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 614                 amd64_mov_reg_imm (code, AMD64_R11, tramp);
 615         }
 616         amd64_call_reg (code, AMD64_R11);
 617
 618         /* Check for thread interruption */
 619         /* This is not perf critical code so no need to check the interrupt flag */
 620         /*
 621          * Have to call the _force_ variant, since there could be a protected wrapper on the top of the stack.
 622          */
 623         amd64_mov_membase_reg (code, AMD64_RBP, res_offset, AMD64_RAX, sizeof(mgreg_t));
 624         if (aot) {
 625                 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
 626         } else {
 627                 amd64_mov_reg_imm (code, AMD64_R11, (guint8*)mono_thread_force_interruption_checkpoint);
 628         }
 629         amd64_call_reg (code, AMD64_R11);
 630
 631         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RBP, res_offset, sizeof(mgreg_t));
 632
 633         /* Restore LMF */
 634
 635         amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, previous_lmf), sizeof(gpointer));
 636         amd64_alu_reg_imm_size (code, X86_SUB, AMD64_RCX, 1, sizeof(gpointer));
 637         amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, lmf_addr), sizeof(gpointer));
 638         amd64_mov_membase_reg (code, AMD64_R11, 0, AMD64_RCX, sizeof(gpointer));
 639
 640         /*
 641          * Save rax to the stack, after the leave instruction, this will become part of
 642          * the red zone.
 643          */
 644         amd64_mov_membase_reg (code, AMD64_RBP, rax_offset, AMD64_RAX, sizeof(mgreg_t));
 645
 646         /* Restore argument registers, r10 (imt method/rgxtx)
 647            and rax (needed for direct calls to C vararg functions). */
 648         for (i = 0; i < AMD64_NREG; ++i)
 649                 if (AMD64_IS_ARGUMENT_REG (i) || i == AMD64_R10 || i == AMD64_RAX)
 650                         amd64_mov_reg_membase (code, i, AMD64_RBP, saved_regs_offset + (i * sizeof(mgreg_t)), sizeof(mgreg_t));
 651
 652         for (i = 0; i < 8; ++i)
 653                 amd64_movsd_reg_membase (code, i, AMD64_RBP, saved_fpregs_offset + (i * sizeof(mgreg_t)));
 654
 655         /* Restore stack */
 656         amd64_leave (code);
 657
 658         if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
 659                 /* Load result */
 660                 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, rax_offset - sizeof(mgreg_t), sizeof(mgreg_t));
 661                 amd64_ret (code);
 662         } else {
 663                 /* call the compiled method using the saved rax */
 664                 amd64_jump_membase (code, AMD64_RSP, rax_offset - sizeof(mgreg_t));
 665         }
 666
 667         g_assert ((code - buf) <= kMaxCodeSize);
 668
 669         nacl_global_codeman_validate (&buf, kMaxCodeSize, &code);
 670
 671         mono_arch_flush_icache (buf, code - buf);
 672
 673         if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT) {
 674                 /* Initialize the nullified class init trampoline used in the AOT case */
 675                 nullified_class_init_trampoline = mono_arch_get_nullified_class_init_trampoline (NULL);
 676         }
 677
 678         if (info)
 679                 *info = mono_tramp_info_create (mono_get_generic_trampoline_name (tramp_type), buf, code - buf, ji, unwind_ops);
 680
 681         return buf;
 682 }
 683
 684 gpointer
 685 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
 686 {
 687         guint8 *code, *buf;
 688
 689         code = buf = mono_global_codeman_reserve (16);
 690         amd64_ret (code);
 691
 692         nacl_global_codeman_validate(&buf, 16, &code);
 693
 694         mono_arch_flush_icache (buf, code - buf);
 695
 696         if (info)
 697                 *info = mono_tramp_info_create (g_strdup_printf ("nullified_class_init_trampoline"), buf, code - buf, NULL, NULL);
 698
 699         if (mono_jit_map_is_enabled ())
 700                 mono_emit_jit_tramp (buf, code - buf, "nullified_class_init_trampoline");
 701
 702         return buf;
 703 }
 704
 705 gpointer
 706 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 707 {
 708         guint8 *code, *buf, *tramp;
 709         int size;
 710         gboolean far_addr = FALSE;
 711
 712         tramp = mono_get_trampoline_code (tramp_type);
 713
 714 #if defined(__default_codegen__)
 715         if ((((guint64)arg1) >> 32) == 0)
 716                 size = 5 + 1 + 4;
 717         else
 718                 size = 5 + 1 + 8;
 719
 720         code = buf = mono_domain_code_reserve_align (domain, size, 1);
 721
 722         if (((gint64)tramp - (gint64)code) >> 31 != 0 && ((gint64)tramp - (gint64)code) >> 31 != -1) {
 723 #ifndef MONO_ARCH_NOMAP32BIT
 724                 g_assert_not_reached ();
 725 #endif
 726                 far_addr = TRUE;
 727                 size += 16;
 728                 code = buf = mono_domain_code_reserve_align (domain, size, 1);
 729         }
 730 #elif defined(__native_client_codegen__)
 731         size = 5 + 1 + 4;
 732         /* Aligning the call site below could */
 733         /* add up to kNaClAlignment-1 bytes   */
 734         size += (kNaClAlignment-1);
 735         buf = mono_domain_code_reserve_align (domain, size, kNaClAlignment);
 736         code = buf;
 737 #endif
 738
 739         if (far_addr) {
 740                 amd64_mov_reg_imm (code, AMD64_R11, tramp);
 741                 amd64_call_reg (code, AMD64_R11);
 742         } else {
 743                 amd64_call_code (code, tramp);
 744         }
 745         /* The trampoline code will obtain the argument from the instruction stream */
 746 #if defined(__default_codegen__)
 747         if ((((guint64)arg1) >> 32) == 0) {
 748                 *code = 0x4;
 749                 *(guint32*)(code + 1) = (gint64)arg1;
 750                 code += 5;
 751         } else {
 752                 *code = 0x8;
 753                 *(guint64*)(code + 1) = (gint64)arg1;
 754                 code += 9;
 755         }
 756 #elif defined(__native_client_codegen__)
 757         /* For NaCl, all tramp args are 32-bit because they're pointers */
 758         *code = 0x68; /* push imm32 */
 759         *(guint32*)(code + 1) = (gint32)arg1;
 760         code += 5;
 761 #endif
 762
 763         g_assert ((code - buf) <= size);
 764
 765         if (code_len)
 766                 *code_len = size;
 767
 768         nacl_domain_code_validate(domain, &buf, size, &code);
 769
 770         mono_arch_flush_icache (buf, size);
 771
 772         return buf;
 773 }
 774
 775 gpointer
 776 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 777 {
 778         guint8 *tramp;
 779         guint8 *code, *buf;
 780         guint8 **rgctx_null_jumps;
 781         int tramp_size;
 782         int depth, index;
 783         int i;
 784         gboolean mrgctx;
 785         MonoJumpInfo *ji = NULL;
 786         GSList *unwind_ops = NULL;
 787
 788         mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 789         index = MONO_RGCTX_SLOT_INDEX (slot);
 790         if (mrgctx)
 791                 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
 792         for (depth = 0; ; ++depth) {
 793                 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
 794
 795                 if (index < size - 1)
 796                         break;
 797                 index -= size - 1;
 798         }
 799
 800         tramp_size = NACL_SIZE (64 + 8 * depth, 128 + 8 * depth);
 801
 802         code = buf = mono_global_codeman_reserve (tramp_size);
 803
 804         unwind_ops = mono_arch_get_cie_program ();
 805
 806         rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
 807
 808         if (mrgctx) {
 809                 /* get mrgctx ptr */
 810                 amd64_mov_reg_reg (code, AMD64_RAX, AMD64_ARG_REG1, 8);
 811         } else {
 812                 /* load rgctx ptr from vtable */
 813                 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context), sizeof(gpointer));
 814                 /* is the rgctx ptr null? */
 815                 amd64_test_reg_reg (code, AMD64_RAX, AMD64_RAX);
 816                 /* if yes, jump to actual trampoline */
 817                 rgctx_null_jumps [0] = code;
 818                 amd64_branch8 (code, X86_CC_Z, -1, 1);
 819         }
 820
 821         for (i = 0; i < depth; ++i) {
 822                 /* load ptr to next array */
 823                 if (mrgctx && i == 0)
 824                         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RAX, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT, sizeof(gpointer));
 825                 else
 826                         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RAX, 0, sizeof(gpointer));
 827                 /* is the ptr null? */
 828                 amd64_test_reg_reg (code, AMD64_RAX, AMD64_RAX);
 829                 /* if yes, jump to actual trampoline */
 830                 rgctx_null_jumps [i + 1] = code;
 831                 amd64_branch8 (code, X86_CC_Z, -1, 1);
 832         }
 833
 834         /* fetch slot */
 835         amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RAX, sizeof (gpointer) * (index + 1), sizeof(gpointer));
 836         /* is the slot null? */
 837         amd64_test_reg_reg (code, AMD64_RAX, AMD64_RAX);
 838         /* if yes, jump to actual trampoline */
 839         rgctx_null_jumps [depth + 1] = code;
 840         amd64_branch8 (code, X86_CC_Z, -1, 1);
 841         /* otherwise return */
 842         amd64_ret (code);
 843
 844         for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
 845                 mono_amd64_patch (rgctx_null_jumps [i], code);
 846
 847         g_free (rgctx_null_jumps);
 848
 849         /* move the rgctx pointer to the VTABLE register */
 850         amd64_mov_reg_reg (code, MONO_ARCH_VTABLE_REG, AMD64_ARG_REG1, sizeof(gpointer));
 851
 852         if (aot) {
 853                 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
 854                 amd64_jump_reg (code, AMD64_R11);
 855         } else {
 856                 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
 857
 858                 /* jump to the actual trampoline */
 859                 amd64_jump_code (code, tramp);
 860         }
 861
 862         nacl_global_codeman_validate (&buf, tramp_size, &code);
 863         mono_arch_flush_icache (buf, code - buf);
 864
 865         g_assert (code - buf <= tramp_size);
 866
 867         if (info)
 868                 *info = mono_tramp_info_create (mono_get_rgctx_fetch_trampoline_name (slot), buf, code - buf, ji, unwind_ops);
 869
 870         return buf;
 871 }
 872
 873 gpointer
 874 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
 875 {
 876         guint8 *tramp;
 877         guint8 *code, *buf;
 878         static int byte_offset = -1;
 879         static guint8 bitmask;
 880         guint8 *jump;
 881         int tramp_size;
 882         GSList *unwind_ops = NULL;
 883         MonoJumpInfo *ji = NULL;
 884
 885         tramp_size = 64;
 886
 887         code = buf = mono_global_codeman_reserve (tramp_size);
 888
 889         if (byte_offset < 0)
 890                 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
 891
 892         amd64_test_membase_imm_size (code, MONO_AMD64_ARG_REG1, byte_offset, bitmask, 1);
 893         jump = code;
 894         amd64_branch8 (code, X86_CC_Z, -1, 1);
 895
 896         amd64_ret (code);
 897
 898         x86_patch (jump, code);
 899
 900         if (aot) {
 901                 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_generic_class_init");
 902                 amd64_jump_reg (code, AMD64_R11);
 903         } else {
 904                 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT, mono_get_root_domain (), NULL);
 905
 906                 /* jump to the actual trampoline */
 907                 amd64_jump_code (code, tramp);
 908         }
 909
 910         nacl_global_codeman_validate (&buf, tramp_size, &code);
 911
 912         mono_arch_flush_icache (buf, code - buf);
 913
 914         g_assert (code - buf <= tramp_size);
 915
 916         if (info)
 917                 *info = mono_tramp_info_create (g_strdup_printf ("generic_class_init_trampoline"), buf, code - buf, ji, unwind_ops);
 918
 919         return buf;
 920 }
 921
 922 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
 923
 924 gpointer
 925 mono_arch_create_monitor_enter_trampoline (MonoTrampInfo **info, gboolean aot)
 926 {
 927         guint8 *tramp;
 928         guint8 *code, *buf;
 929         guint8 *jump_obj_null, *jump_sync_null, *jump_cmpxchg_failed, *jump_other_owner, *jump_tid, *jump_sync_thin_hash = NULL;
 930         int tramp_size;
 931         int owner_offset, nest_offset, dummy;
 932         MonoJumpInfo *ji = NULL;
 933         GSList *unwind_ops = NULL;
 934
 935         g_assert (MONO_ARCH_MONITOR_OBJECT_REG == AMD64_RDI);
 936
 937         mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &dummy);
 938         g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
 939         g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
 940         owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
 941         nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
 942
 943         tramp_size = 96;
 944
 945         code = buf = mono_global_codeman_reserve (tramp_size);
 946
 947         unwind_ops = mono_arch_get_cie_program ();
 948
 949         if (mono_thread_get_tls_offset () != -1) {
 950                 /* MonoObject* obj is in RDI */
 951                 /* is obj null? */
 952                 amd64_test_reg_reg (code, AMD64_RDI, AMD64_RDI);
 953                 /* if yes, jump to actual trampoline */
 954                 jump_obj_null = code;
 955                 amd64_branch8 (code, X86_CC_Z, -1, 1);
 956
 957                 /* load obj->synchronization to RCX */
 958                 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RDI, G_STRUCT_OFFSET (MonoObject, synchronisation), 8);
 959
 960                 if (mono_gc_is_moving ()) {
 961                         /*if bit zero is set it's a thin hash*/
 962                         /*FIXME use testb encoding*/
 963                         amd64_test_reg_imm (code, AMD64_RCX, 0x01);
 964                         jump_sync_thin_hash = code;
 965                         amd64_branch8 (code, X86_CC_NE, -1, 1);
 966
 967                         /*clear bits used by the gc*/
 968                         amd64_alu_reg_imm (code, X86_AND, AMD64_RCX, ~0x3);
 969                 }
 970
 971                 /* is synchronization null? */
 972                 amd64_test_reg_reg (code, AMD64_RCX, AMD64_RCX);
 973                 /* if yes, jump to actual trampoline */
 974                 jump_sync_null = code;
 975                 amd64_branch8 (code, X86_CC_Z, -1, 1);
 976
 977                 /* load MonoInternalThread* into RDX */
 978                 code = mono_amd64_emit_tls_get (code, AMD64_RDX, mono_thread_get_tls_offset ());
 979                 /* load TID into RDX */
 980                 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_RDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 8);
 981
 982                 /* is synchronization->owner null? */
 983                 amd64_alu_membase_imm_size (code, X86_CMP, AMD64_RCX, owner_offset, 0, 8);
 984                 /* if not, jump to next case */
 985                 jump_tid = code;
 986                 amd64_branch8 (code, X86_CC_NZ, -1, 1);
 987
 988                 /* if yes, try a compare-exchange with the TID */
 989                 /* zero RAX */
 990                 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
 991                 /* compare and exchange */
 992                 amd64_prefix (code, X86_LOCK_PREFIX);
 993                 amd64_cmpxchg_membase_reg_size (code, AMD64_RCX, owner_offset, AMD64_RDX, 8);
 994                 /* if not successful, jump to actual trampoline */
 995                 jump_cmpxchg_failed = code;
 996                 amd64_branch8 (code, X86_CC_NZ, -1, 1);
 997                 /* if successful, return */
 998                 amd64_ret (code);
 999
1000                 /* next case: synchronization->owner is not null */
1001                 x86_patch (jump_tid, code);
1002                 /* is synchronization->owner == TID? */
1003                 amd64_alu_membase_reg_size (code, X86_CMP, AMD64_RCX, owner_offset, AMD64_RDX, 8);
1004                 /* if not, jump to actual trampoline */
1005                 jump_other_owner = code;
1006                 amd64_branch8 (code, X86_CC_NZ, -1, 1);
1007                 /* if yes, increment nest */
1008                 amd64_inc_membase_size (code, AMD64_RCX, nest_offset, 4);
1009                 /* return */
1010                 amd64_ret (code);
1011
1012                 x86_patch (jump_obj_null, code);
1013                 if (jump_sync_thin_hash)
1014                         x86_patch (jump_sync_thin_hash, code);
1015                 x86_patch (jump_sync_null, code);
1016                 x86_patch (jump_cmpxchg_failed, code);
1017                 x86_patch (jump_other_owner, code);
1018         }
1019
1020         /* jump to the actual trampoline */
1021 #if MONO_AMD64_ARG_REG1 != AMD64_RDI
1022         amd64_mov_reg_reg (code, MONO_AMD64_ARG_REG1, AMD64_RDI);
1023 #endif
1024
1025         if (aot) {
1026                 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_monitor_enter");
1027                 amd64_jump_reg (code, AMD64_R11);
1028         } else {
1029                 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_MONITOR_ENTER, mono_get_root_domain (), NULL);
1030
1031                 /* jump to the actual trampoline */
1032                 amd64_jump_code (code, tramp);
1033         }
1034
1035         nacl_global_codeman_validate (&buf, tramp_size, &code);
1036
1037         mono_arch_flush_icache (code, code - buf);
1038         g_assert (code - buf <= tramp_size);
1039
1040         if (info)
1041                 *info = mono_tramp_info_create (g_strdup_printf ("monitor_enter_trampoline"), buf, code - buf, ji, unwind_ops);
1042
1043         return buf;
1044 }
1045
1046 gpointer
1047 mono_arch_create_monitor_exit_trampoline (MonoTrampInfo **info, gboolean aot)
1048 {
1049         guint8 *tramp;
1050         guint8 *code, *buf;
1051         guint8 *jump_obj_null, *jump_have_waiters, *jump_sync_null, *jump_not_owned, *jump_sync_thin_hash = NULL;
1052         guint8 *jump_next;
1053         int tramp_size;
1054         int owner_offset, nest_offset, entry_count_offset;
1055         MonoJumpInfo *ji = NULL;
1056         GSList *unwind_ops = NULL;
1057
1058         g_assert (MONO_ARCH_MONITOR_OBJECT_REG == AMD64_RDI);
1059
1060         mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &entry_count_offset);
1061         g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
1062         g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
1063         g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (entry_count_offset) == sizeof (gint32));
1064         owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
1065         nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
1066         entry_count_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (entry_count_offset);
1067
1068         tramp_size = 112;
1069
1070         code = buf = mono_global_codeman_reserve (tramp_size);
1071
1072         unwind_ops = mono_arch_get_cie_program ();
1073
1074         if (mono_thread_get_tls_offset () != -1) {
1075                 /* MonoObject* obj is in RDI */
1076                 /* is obj null? */
1077                 amd64_test_reg_reg (code, AMD64_RDI, AMD64_RDI);
1078                 /* if yes, jump to actual trampoline */
1079                 jump_obj_null = code;
1080                 amd64_branch8 (code, X86_CC_Z, -1, 1);
1081
1082                 /* load obj->synchronization to RCX */
1083                 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RDI, G_STRUCT_OFFSET (MonoObject, synchronisation), 8);
1084
1085                 if (mono_gc_is_moving ()) {
1086                         /*if bit zero is set it's a thin hash*/
1087                         /*FIXME use testb encoding*/
1088                         amd64_test_reg_imm (code, AMD64_RCX, 0x01);
1089                         jump_sync_thin_hash = code;
1090                         amd64_branch8 (code, X86_CC_NE, -1, 1);
1091
1092                         /*clear bits used by the gc*/
1093                         amd64_alu_reg_imm (code, X86_AND, AMD64_RCX, ~0x3);
1094                 }
1095
1096                 /* is synchronization null? */
1097                 amd64_test_reg_reg (code, AMD64_RCX, AMD64_RCX);
1098                 /* if yes, jump to actual trampoline */
1099                 jump_sync_null = code;
1100                 amd64_branch8 (code, X86_CC_Z, -1, 1);
1101
1102                 /* next case: synchronization is not null */
1103                 /* load MonoInternalThread* into RDX */
1104                 code = mono_amd64_emit_tls_get (code, AMD64_RDX, mono_thread_get_tls_offset ());
1105                 /* load TID into RDX */
1106                 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_RDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 8);
1107                 /* is synchronization->owner == TID */
1108                 amd64_alu_membase_reg_size (code, X86_CMP, AMD64_RCX, owner_offset, AMD64_RDX, 8);
1109                 /* if no, jump to actual trampoline */
1110                 jump_not_owned = code;
1111                 amd64_branch8 (code, X86_CC_NZ, -1, 1);
1112
1113                 /* next case: synchronization->owner == TID */
1114                 /* is synchronization->nest == 1 */
1115                 amd64_alu_membase_imm_size (code, X86_CMP, AMD64_RCX, nest_offset, 1, 4);
1116                 /* if not, jump to next case */
1117                 jump_next = code;
1118                 amd64_branch8 (code, X86_CC_NZ, -1, 1);
1119                 /* if yes, is synchronization->entry_count zero? */
1120                 amd64_alu_membase_imm_size (code, X86_CMP, AMD64_RCX, entry_count_offset, 0, 4);
1121                 /* if not, jump to actual trampoline */
1122                 jump_have_waiters = code;
1123                 amd64_branch8 (code, X86_CC_NZ, -1 , 1);
1124                 /* if yes, set synchronization->owner to null and return */
1125                 amd64_mov_membase_imm (code, AMD64_RCX, owner_offset, 0, 8);
1126                 amd64_ret (code);
1127
1128                 /* next case: synchronization->nest is not 1 */
1129                 x86_patch (jump_next, code);
1130                 /* decrease synchronization->nest and return */
1131                 amd64_dec_membase_size (code, AMD64_RCX, nest_offset, 4);
1132                 amd64_ret (code);
1133
1134                 x86_patch (jump_obj_null, code);
1135                 x86_patch (jump_have_waiters, code);
1136                 x86_patch (jump_not_owned, code);
1137                 x86_patch (jump_sync_null, code);
1138         }
1139
1140         /* jump to the actual trampoline */
1141 #if MONO_AMD64_ARG_REG1 != AMD64_RDI
1142         amd64_mov_reg_reg (code, MONO_AMD64_ARG_REG1, AMD64_RDI);
1143 #endif
1144
1145         if (aot) {
1146                 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_monitor_exit");
1147                 amd64_jump_reg (code, AMD64_R11);
1148         } else {
1149                 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_MONITOR_EXIT, mono_get_root_domain (), NULL);
1150                 amd64_jump_code (code, tramp);
1151         }
1152
1153         nacl_global_codeman_validate (&buf, tramp_size, &code);
1154
1155         mono_arch_flush_icache (code, code - buf);
1156         g_assert (code - buf <= tramp_size);
1157
1158         if (info)
1159                 *info = mono_tramp_info_create (g_strdup_printf ("monitor_exit_trampoline"), buf, code - buf, ji, unwind_ops);
1160
1161         return buf;
1162 }
1163 #endif
1164
1165 void
1166 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
1167 {
1168         /* FIXME: This is not thread safe */
1169         guint8 *code = ji->code_start;
1170
1171         amd64_mov_reg_imm (code, AMD64_ARG_REG1, func_arg);
1172         amd64_mov_reg_imm (code, AMD64_R11, func);
1173
1174         x86_push_imm (code, (guint64)func_arg);
1175         amd64_call_reg (code, AMD64_R11);
1176 }
1177
1178
1179 static void
1180 handler_block_trampoline_helper (gpointer *ptr)
1181 {
1182         MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1183         *ptr = jit_tls->handler_block_return_address;
1184 }
1185
1186 gpointer
1187 mono_arch_create_handler_block_trampoline (void)
1188 {
1189         guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
1190         guint8 *code, *buf;
1191         int tramp_size = 64;
1192         code = buf = mono_global_codeman_reserve (tramp_size);
1193
1194         /*
1195         This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
1196         */
1197
1198         if (mono_get_jit_tls_offset () != -1) {
1199                 code = mono_amd64_emit_tls_get (code, AMD64_RDI, mono_get_jit_tls_offset ());
1200                 /*simulate a call*/
1201                 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RDI, G_STRUCT_OFFSET (MonoJitTlsData, handler_block_return_address), 8);
1202                 amd64_jump_code (code, tramp);
1203         } else {
1204                 /*Slow path uses a c helper*/
1205                 amd64_mov_reg_reg (code, AMD64_RDI, AMD64_RSP, 8);
1206                 amd64_mov_reg_imm (code, AMD64_RAX, tramp);
1207                 amd64_push_reg (code, AMD64_RAX);
1208                 amd64_jump_code (code, handler_block_trampoline_helper);
1209         }
1210
1211         mono_arch_flush_icache (buf, code - buf);
1212         g_assert (code - buf <= tramp_size);
1213
1214         if (mono_jit_map_is_enabled ())
1215                 mono_emit_jit_tramp (buf, code - buf, "handler_block_trampoline");
1216
1217         return buf;
1218 }
1219
1220 /*
1221  * mono_arch_get_call_target:
1222  *
1223  *   Return the address called by the code before CODE if exists.
1224  */
1225 guint8*
1226 mono_arch_get_call_target (guint8 *code)
1227 {
1228         if (code [-5] == 0xe8) {
1229                 guint32 disp = *(guint32*)(code - 4);
1230                 guint8 *target = code + disp;
1231
1232                 return target;
1233         } else {
1234                 return NULL;
1235         }
1236 }
1237
1238 /*
1239  * mono_arch_get_plt_info_offset:
1240  *
1241  *   Return the PLT info offset belonging to the plt entry PLT_ENTRY.
1242  */
1243 guint32
1244 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1245 {
1246 #if defined(__native_client__) || defined(__native_client_codegen__)
1247         /* 18 = 3 (mov opcode) + 4 (disp) + 10 (nacljmp) + 1 (push opcode) */
1248         /* See aot-compiler.c arch_emit_plt_entry for details.             */
1249         return *(guint32*)(plt_entry + 18);
1250 #else
1251         return *(guint32*)(plt_entry + 6);
1252 #endif
1253 }