2 * tramp-amd64.c: JIT trampoline code for amd64
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Zoltan Varga (vargaz@gmail.com)
8 * (C) 2001 Ximian, Inc.
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>
23 #include <mono/utils/memcheck.h>
26 #include "mini-amd64.h"
28 #if defined(__native_client_codegen__) && defined(__native_client__)
30 #include <sys/nacl_syscalls.h>
33 #define IS_REX(inst) (((inst) >= 0x40) && ((inst) <= 0x4f))
35 static guint8* nullified_class_init_trampoline;
38 * mono_arch_get_unbox_trampoline:
40 * @addr: pointer to native code for @m
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
47 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
52 MonoDomain *domain = mono_domain_get ();
54 this_reg = mono_arch_get_this_arg_reg (NULL);
56 start = code = mono_domain_code_reserve (domain, 20);
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);
64 nacl_domain_code_validate (domain, &start, 20, &code);
66 mono_arch_flush_icache (start, code - start);
72 * mono_arch_get_static_rgctx_trampoline:
74 * Create a trampoline which sets RGCTX_REG to MRGCTX, then jumps to ADDR.
77 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
82 MonoDomain *domain = mono_domain_get ();
84 #ifdef MONO_ARCH_NOMAP32BIT
87 /* AOTed code could still have a non-32 bit address */
88 if ((((guint64)addr) >> 32) == 0)
94 start = code = mono_domain_code_reserve (domain, buf_len);
96 amd64_mov_reg_imm (code, MONO_ARCH_RGCTX_REG, mrgctx);
97 amd64_jump_code (code, addr);
98 g_assert ((code - start) < buf_len);
100 nacl_domain_code_validate (domain, &start, buf_len, &code);
101 mono_arch_flush_icache (start, code - start);
107 mono_arch_get_llvm_imt_trampoline (MonoDomain *domain, MonoMethod *m, int vt_offset)
109 guint8 *code, *start;
115 start = code = mono_domain_code_reserve (domain, buf_len);
117 this_reg = mono_arch_get_this_arg_reg (NULL);
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);
126 g_assert ((code - start) < buf_len);
128 nacl_domain_code_validate (domain, &start, buf_len, &code);
130 mono_arch_flush_icache (start, code - start);
136 * mono_arch_patch_callsite:
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.
142 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
144 #if defined(__default_codegen__)
147 gboolean can_write = mono_breakpoint_clean_code (method_start, orig_code, 14, buf, sizeof (buf));
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) {
155 InterlockedExchangePointer ((gpointer*)(orig_code - 11), addr);
156 VALGRIND_DISCARD_TRANSLATIONS (orig_code - 11, sizeof (gpointer));
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);
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);
168 fprintf (stderr, "Callee: %s\n", mono_method_full_name (ji->method, TRUE));
169 g_assert_not_reached ();
172 * This might happen when calling AOTed code. Create a thunk.
174 guint8 *thunk_start, *thunk_code;
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;
180 g_assert ((((guint64)(addr)) >> 32) == 0);
181 mono_arch_flush_icache (thunk_start, thunk_code - thunk_start);
184 g_assert ((((guint64)(orig_code)) >> 32) == 0);
186 InterlockedExchange ((gint32*)(orig_code - 4), ((gint64)addr - (gint64)orig_code));
187 VALGRIND_DISCARD_TRANSLATIONS (orig_code - 5, 4);
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)));
195 InterlockedExchangePointer (got_entry, addr);
196 VALGRIND_DISCARD_TRANSLATIONS (orig_code - 5, sizeof (gpointer));
199 #elif defined(__native_client__)
200 /* These are essentially the same 2 cases as above, modified for NaCl*/
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);
207 if (orig_code[-5] == 0xe8) {
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));
217 else if (is_nacl_call_reg_sequence (orig_code - 10) && orig_code[-16] == 0x41 && orig_code[-15] == 0xbb) {
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));
226 g_assert_not_reached ();
234 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
237 gpointer *plt_jump_table_entry;
239 #if defined(__default_codegen__)
240 /* A PLT entry: jmp *<DISP>(%rip) */
241 g_assert (code [0] == 0xff);
242 g_assert (code [1] == 0x25);
244 disp = *(gint32*)(code + 2);
246 plt_jump_table_entry = (gpointer*)(code + 6 + disp);
247 #elif defined(__native_client_codegen__)
249 /* mov <DISP>(%rip), %r11d */
252 /* Verify the 'mov' */
253 g_assert (code [0] == 0x45);
254 g_assert (code [1] == 0x8b);
255 g_assert (code [2] == 0x1d);
257 disp = *(gint32*)(code + 3);
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);
263 #endif /* __native_client_codegen__ */
266 InterlockedExchangePointer (plt_jump_table_entry, addr);
270 get_vcall_slot (guint8 *code, mgreg_t *regs, int *displacement)
274 MonoJitInfo *ji = NULL;
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);
282 mono_breakpoint_clean_code (ji ? ji->code_start : NULL, code, 9, buf, sizeof (buf));
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);
295 g_assert_not_reached ();
301 get_vcall_slot_addr (guint8* code, mgreg_t *regs)
305 vt = get_vcall_slot (code, regs, &displacement);
308 return (gpointer*)((char*)vt + displacement);
312 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
315 MonoJitInfo *ji = NULL;
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);
324 can_write = mono_breakpoint_clean_code (ji ? ji->code_start : NULL, code, 7, buf, sizeof (buf));
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
334 if ((buf [0] == 0x41) && (buf [1] == 0xff) && (buf [2] == 0x15)) {
335 gpointer *vtable_slot;
337 /* call *<OFFSET>(%rip) */
338 vtable_slot = get_vcall_slot_addr (code, regs);
339 g_assert (vtable_slot);
341 *vtable_slot = nullified_class_init_trampoline;
342 } else if (buf [2] == 0xe8) {
344 //guint8 *buf = code - 2;
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.
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) {
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 */
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 ();
375 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
377 if (mono_aot_only && !nullified_class_init_trampoline)
378 nullified_class_init_trampoline = mono_aot_get_trampoline ("nullified_class_init_trampoline");
380 mono_arch_patch_plt_entry (code, NULL, regs, nullified_class_init_trampoline);
384 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
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;
390 GSList *unwind_ops = NULL;
391 MonoJumpInfo *ji = NULL;
392 const guint kMaxCodeSize = NACL_SIZE (548, 548*2);
394 #if defined(__native_client_codegen__)
395 const guint kNaClTrampOffset = 17;
398 if (tramp_type == MONO_TRAMPOLINE_JUMP)
403 code = buf = mono_global_codeman_reserve (kMaxCodeSize);
405 framesize = kMaxCodeSize + sizeof (MonoLMF);
406 framesize = (framesize + (MONO_ARCH_FRAME_ALIGNMENT - 1)) & ~ (MONO_ARCH_FRAME_ALIGNMENT - 1);
408 orig_rsp_to_rbp_offset = 0;
409 r11_save_code = code;
410 /* Reserve 5 bytes for the mov_membase_reg to save R11 */
412 after_r11_save_code = code;
414 // CFA = sp + 16 (the trampoline address is on the stack)
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);
420 /* Pop the return address off the stack */
421 amd64_pop_reg (code, AMD64_R11);
422 orig_rsp_to_rbp_offset += sizeof(mgreg_t);
424 cfa_offset -= sizeof(mgreg_t);
425 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
428 * Allocate a new stack frame
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);
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);
441 rbp_offset = - offset;
443 offset += sizeof(mgreg_t);
444 rax_offset = - offset;
446 offset += sizeof(mgreg_t);
447 tramp_offset = - offset;
449 offset += sizeof(gpointer);
450 arg_offset = - offset;
452 /* Compute the trampoline address from the return address */
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);
461 /* 5 = length of amd64_call_membase () */
462 amd64_alu_reg_imm (code, X86_SUB, AMD64_R11, 5);
464 amd64_mov_membase_reg (code, AMD64_RBP, tramp_offset, AMD64_R11, sizeof(gpointer));
466 offset += sizeof(mgreg_t);
467 res_offset = - offset;
469 /* Save all registers */
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));
481 /* We have to save R11 right at the start of
482 the trampoline code because it's used as a
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);
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);
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 */
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);
507 /* Compute the address of the GOT slot */
508 amd64_alu_reg_reg_size (code, X86_ADD, AMD64_R11, AMD64_RAX, sizeof(gpointer));
510 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, 0, sizeof(gpointer));
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);
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);
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);
532 amd64_mov_membase_reg (code, AMD64_RBP, arg_offset, AMD64_R11, sizeof(gpointer));
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));
540 offset += sizeof (MonoLMF);
541 lmf_offset = - offset;
545 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, 8, sizeof(gpointer));
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));
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));
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));
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));
561 amd64_mov_membase_imm (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, method), 0, sizeof(gpointer));
563 /* Save callee saved regs */
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));
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));
575 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
577 amd64_mov_reg_imm (code, AMD64_R11, mono_get_lmf_addr);
579 amd64_call_reg (code, AMD64_R11);
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));
589 amd64_lea_membase (code, AMD64_R11, AMD64_RBP, lmf_offset);
590 amd64_mov_membase_reg (code, AMD64_RAX, 0, AMD64_R11, sizeof(gpointer));
594 /* Arg1 is the pointer to the saved registers */
595 amd64_lea_membase (code, AMD64_ARG_REG1, AMD64_RBP, saved_regs_offset);
597 /* Arg2 is the address of the calling code */
599 amd64_mov_reg_membase (code, AMD64_ARG_REG2, AMD64_RBP, 8, sizeof(gpointer));
601 amd64_mov_reg_imm (code, AMD64_ARG_REG2, 0);
603 /* Arg3 is the method/vtable ptr */
604 amd64_mov_reg_membase (code, AMD64_ARG_REG3, AMD64_RBP, arg_offset, sizeof(gpointer));
606 /* Arg4 is the trampoline address */
607 amd64_mov_reg_membase (code, AMD64_ARG_REG4, AMD64_RBP, tramp_offset, sizeof(gpointer));
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);
613 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
614 amd64_mov_reg_imm (code, AMD64_R11, tramp);
616 amd64_call_reg (code, AMD64_R11);
618 /* Check for thread interruption */
619 /* This is not perf critical code so no need to check the interrupt flag */
621 * Have to call the _force_ variant, since there could be a protected wrapper on the top of the stack.
623 amd64_mov_membase_reg (code, AMD64_RBP, res_offset, AMD64_RAX, sizeof(mgreg_t));
625 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
627 amd64_mov_reg_imm (code, AMD64_R11, (guint8*)mono_thread_force_interruption_checkpoint);
629 amd64_call_reg (code, AMD64_R11);
631 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RBP, res_offset, sizeof(mgreg_t));
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));
641 * Save rax to the stack, after the leave instruction, this will become part of
644 amd64_mov_membase_reg (code, AMD64_RBP, rax_offset, AMD64_RAX, sizeof(mgreg_t));
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));
652 for (i = 0; i < 8; ++i)
653 amd64_movsd_reg_membase (code, i, AMD64_RBP, saved_fpregs_offset + (i * sizeof(mgreg_t)));
658 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
660 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, rax_offset - sizeof(mgreg_t), sizeof(mgreg_t));
663 /* call the compiled method using the saved rax */
664 amd64_jump_membase (code, AMD64_RSP, rax_offset - sizeof(mgreg_t));
667 g_assert ((code - buf) <= kMaxCodeSize);
669 nacl_global_codeman_validate (&buf, kMaxCodeSize, &code);
671 mono_arch_flush_icache (buf, code - buf);
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);
679 *info = mono_tramp_info_create (mono_get_generic_trampoline_name (tramp_type), buf, code - buf, ji, unwind_ops);
685 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
689 code = buf = mono_global_codeman_reserve (16);
692 nacl_global_codeman_validate(&buf, 16, &code);
694 mono_arch_flush_icache (buf, code - buf);
697 *info = mono_tramp_info_create (g_strdup_printf ("nullified_class_init_trampoline"), buf, code - buf, NULL, NULL);
699 if (mono_jit_map_is_enabled ())
700 mono_emit_jit_tramp (buf, code - buf, "nullified_class_init_trampoline");
706 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
708 guint8 *code, *buf, *tramp;
711 tramp = mono_get_trampoline_code (tramp_type);
713 #if defined(__default_codegen__)
714 if ((((guint64)arg1) >> 32) == 0)
719 code = buf = mono_domain_code_reserve_align (domain, size, 1);
720 #elif defined(__native_client_codegen__)
722 /* Aligning the call site below could */
723 /* add up to kNaClAlignment-1 bytes */
724 size += (kNaClAlignment-1);
725 buf = mono_domain_code_reserve_align (domain, size, kNaClAlignment);
729 amd64_call_code (code, tramp);
730 /* The trampoline code will obtain the argument from the instruction stream */
731 #if defined(__default_codegen__)
732 if ((((guint64)arg1) >> 32) == 0) {
734 *(guint32*)(code + 1) = (gint64)arg1;
738 *(guint64*)(code + 1) = (gint64)arg1;
741 #elif defined(__native_client_codegen__)
742 /* For NaCl, all tramp args are 32-bit because they're pointers */
743 *code = 0x68; /* push imm32 */
744 *(guint32*)(code + 1) = (gint32)arg1;
748 g_assert ((code - buf) <= size);
753 nacl_domain_code_validate(domain, &buf, size, &code);
755 mono_arch_flush_icache (buf, size);
761 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
765 guint8 **rgctx_null_jumps;
770 MonoJumpInfo *ji = NULL;
771 GSList *unwind_ops = NULL;
773 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
774 index = MONO_RGCTX_SLOT_INDEX (slot);
776 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
777 for (depth = 0; ; ++depth) {
778 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
780 if (index < size - 1)
785 tramp_size = NACL_SIZE (64 + 8 * depth, 128 + 8 * depth);
787 code = buf = mono_global_codeman_reserve (tramp_size);
789 unwind_ops = mono_arch_get_cie_program ();
791 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
795 amd64_mov_reg_reg (code, AMD64_RAX, AMD64_ARG_REG1, 8);
797 /* load rgctx ptr from vtable */
798 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context), sizeof(gpointer));
799 /* is the rgctx ptr null? */
800 amd64_test_reg_reg (code, AMD64_RAX, AMD64_RAX);
801 /* if yes, jump to actual trampoline */
802 rgctx_null_jumps [0] = code;
803 amd64_branch8 (code, X86_CC_Z, -1, 1);
806 for (i = 0; i < depth; ++i) {
807 /* load ptr to next array */
808 if (mrgctx && i == 0)
809 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RAX, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT, sizeof(gpointer));
811 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RAX, 0, sizeof(gpointer));
812 /* is the ptr null? */
813 amd64_test_reg_reg (code, AMD64_RAX, AMD64_RAX);
814 /* if yes, jump to actual trampoline */
815 rgctx_null_jumps [i + 1] = code;
816 amd64_branch8 (code, X86_CC_Z, -1, 1);
820 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RAX, sizeof (gpointer) * (index + 1), sizeof(gpointer));
821 /* is the slot null? */
822 amd64_test_reg_reg (code, AMD64_RAX, AMD64_RAX);
823 /* if yes, jump to actual trampoline */
824 rgctx_null_jumps [depth + 1] = code;
825 amd64_branch8 (code, X86_CC_Z, -1, 1);
826 /* otherwise return */
829 for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
830 mono_amd64_patch (rgctx_null_jumps [i], code);
832 g_free (rgctx_null_jumps);
834 /* move the rgctx pointer to the VTABLE register */
835 amd64_mov_reg_reg (code, MONO_ARCH_VTABLE_REG, AMD64_ARG_REG1, sizeof(gpointer));
838 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
839 amd64_jump_reg (code, AMD64_R11);
841 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
843 /* jump to the actual trampoline */
844 amd64_jump_code (code, tramp);
847 nacl_global_codeman_validate (&buf, tramp_size, &code);
848 mono_arch_flush_icache (buf, code - buf);
850 g_assert (code - buf <= tramp_size);
853 *info = mono_tramp_info_create (mono_get_rgctx_fetch_trampoline_name (slot), buf, code - buf, ji, unwind_ops);
859 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
863 static int byte_offset = -1;
864 static guint8 bitmask;
867 GSList *unwind_ops = NULL;
868 MonoJumpInfo *ji = NULL;
872 code = buf = mono_global_codeman_reserve (tramp_size);
875 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
877 amd64_test_membase_imm_size (code, MONO_AMD64_ARG_REG1, byte_offset, bitmask, 1);
879 amd64_branch8 (code, X86_CC_Z, -1, 1);
883 x86_patch (jump, code);
886 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_generic_class_init");
887 amd64_jump_reg (code, AMD64_R11);
889 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT, mono_get_root_domain (), NULL);
891 /* jump to the actual trampoline */
892 amd64_jump_code (code, tramp);
895 nacl_global_codeman_validate (&buf, tramp_size, &code);
897 mono_arch_flush_icache (buf, code - buf);
899 g_assert (code - buf <= tramp_size);
902 *info = mono_tramp_info_create (g_strdup_printf ("generic_class_init_trampoline"), buf, code - buf, ji, unwind_ops);
907 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
910 mono_arch_create_monitor_enter_trampoline (MonoTrampInfo **info, gboolean aot)
914 guint8 *jump_obj_null, *jump_sync_null, *jump_cmpxchg_failed, *jump_other_owner, *jump_tid, *jump_sync_thin_hash = NULL;
916 int owner_offset, nest_offset, dummy;
917 MonoJumpInfo *ji = NULL;
918 GSList *unwind_ops = NULL;
920 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == AMD64_RDI);
922 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &dummy);
923 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
924 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
925 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
926 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
930 code = buf = mono_global_codeman_reserve (tramp_size);
932 unwind_ops = mono_arch_get_cie_program ();
934 if (mono_thread_get_tls_offset () != -1) {
935 /* MonoObject* obj is in RDI */
937 amd64_test_reg_reg (code, AMD64_RDI, AMD64_RDI);
938 /* if yes, jump to actual trampoline */
939 jump_obj_null = code;
940 amd64_branch8 (code, X86_CC_Z, -1, 1);
942 /* load obj->synchronization to RCX */
943 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RDI, G_STRUCT_OFFSET (MonoObject, synchronisation), 8);
945 if (mono_gc_is_moving ()) {
946 /*if bit zero is set it's a thin hash*/
947 /*FIXME use testb encoding*/
948 amd64_test_reg_imm (code, AMD64_RCX, 0x01);
949 jump_sync_thin_hash = code;
950 amd64_branch8 (code, X86_CC_NE, -1, 1);
952 /*clear bits used by the gc*/
953 amd64_alu_reg_imm (code, X86_AND, AMD64_RCX, ~0x3);
956 /* is synchronization null? */
957 amd64_test_reg_reg (code, AMD64_RCX, AMD64_RCX);
958 /* if yes, jump to actual trampoline */
959 jump_sync_null = code;
960 amd64_branch8 (code, X86_CC_Z, -1, 1);
962 /* load MonoInternalThread* into RDX */
963 code = mono_amd64_emit_tls_get (code, AMD64_RDX, mono_thread_get_tls_offset ());
964 /* load TID into RDX */
965 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_RDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 8);
967 /* is synchronization->owner null? */
968 amd64_alu_membase_imm_size (code, X86_CMP, AMD64_RCX, owner_offset, 0, 8);
969 /* if not, jump to next case */
971 amd64_branch8 (code, X86_CC_NZ, -1, 1);
973 /* if yes, try a compare-exchange with the TID */
975 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
976 /* compare and exchange */
977 amd64_prefix (code, X86_LOCK_PREFIX);
978 amd64_cmpxchg_membase_reg_size (code, AMD64_RCX, owner_offset, AMD64_RDX, 8);
979 /* if not successful, jump to actual trampoline */
980 jump_cmpxchg_failed = code;
981 amd64_branch8 (code, X86_CC_NZ, -1, 1);
982 /* if successful, return */
985 /* next case: synchronization->owner is not null */
986 x86_patch (jump_tid, code);
987 /* is synchronization->owner == TID? */
988 amd64_alu_membase_reg_size (code, X86_CMP, AMD64_RCX, owner_offset, AMD64_RDX, 8);
989 /* if not, jump to actual trampoline */
990 jump_other_owner = code;
991 amd64_branch8 (code, X86_CC_NZ, -1, 1);
992 /* if yes, increment nest */
993 amd64_inc_membase_size (code, AMD64_RCX, nest_offset, 4);
997 x86_patch (jump_obj_null, code);
998 if (jump_sync_thin_hash)
999 x86_patch (jump_sync_thin_hash, code);
1000 x86_patch (jump_sync_null, code);
1001 x86_patch (jump_cmpxchg_failed, code);
1002 x86_patch (jump_other_owner, code);
1005 /* jump to the actual trampoline */
1006 #if MONO_AMD64_ARG_REG1 != AMD64_RDI
1007 amd64_mov_reg_reg (code, MONO_AMD64_ARG_REG1, AMD64_RDI);
1011 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_monitor_enter");
1012 amd64_jump_reg (code, AMD64_R11);
1014 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_MONITOR_ENTER, mono_get_root_domain (), NULL);
1016 /* jump to the actual trampoline */
1017 amd64_jump_code (code, tramp);
1020 nacl_global_codeman_validate (&buf, tramp_size, &code);
1022 mono_arch_flush_icache (code, code - buf);
1023 g_assert (code - buf <= tramp_size);
1026 *info = mono_tramp_info_create (g_strdup_printf ("monitor_enter_trampoline"), buf, code - buf, ji, unwind_ops);
1032 mono_arch_create_monitor_exit_trampoline (MonoTrampInfo **info, gboolean aot)
1036 guint8 *jump_obj_null, *jump_have_waiters, *jump_sync_null, *jump_not_owned, *jump_sync_thin_hash = NULL;
1039 int owner_offset, nest_offset, entry_count_offset;
1040 MonoJumpInfo *ji = NULL;
1041 GSList *unwind_ops = NULL;
1043 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == AMD64_RDI);
1045 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &entry_count_offset);
1046 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
1047 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
1048 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (entry_count_offset) == sizeof (gint32));
1049 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
1050 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
1051 entry_count_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (entry_count_offset);
1055 code = buf = mono_global_codeman_reserve (tramp_size);
1057 unwind_ops = mono_arch_get_cie_program ();
1059 if (mono_thread_get_tls_offset () != -1) {
1060 /* MonoObject* obj is in RDI */
1062 amd64_test_reg_reg (code, AMD64_RDI, AMD64_RDI);
1063 /* if yes, jump to actual trampoline */
1064 jump_obj_null = code;
1065 amd64_branch8 (code, X86_CC_Z, -1, 1);
1067 /* load obj->synchronization to RCX */
1068 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RDI, G_STRUCT_OFFSET (MonoObject, synchronisation), 8);
1070 if (mono_gc_is_moving ()) {
1071 /*if bit zero is set it's a thin hash*/
1072 /*FIXME use testb encoding*/
1073 amd64_test_reg_imm (code, AMD64_RCX, 0x01);
1074 jump_sync_thin_hash = code;
1075 amd64_branch8 (code, X86_CC_NE, -1, 1);
1077 /*clear bits used by the gc*/
1078 amd64_alu_reg_imm (code, X86_AND, AMD64_RCX, ~0x3);
1081 /* is synchronization null? */
1082 amd64_test_reg_reg (code, AMD64_RCX, AMD64_RCX);
1083 /* if yes, jump to actual trampoline */
1084 jump_sync_null = code;
1085 amd64_branch8 (code, X86_CC_Z, -1, 1);
1087 /* next case: synchronization is not null */
1088 /* load MonoInternalThread* into RDX */
1089 code = mono_amd64_emit_tls_get (code, AMD64_RDX, mono_thread_get_tls_offset ());
1090 /* load TID into RDX */
1091 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_RDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 8);
1092 /* is synchronization->owner == TID */
1093 amd64_alu_membase_reg_size (code, X86_CMP, AMD64_RCX, owner_offset, AMD64_RDX, 8);
1094 /* if no, jump to actual trampoline */
1095 jump_not_owned = code;
1096 amd64_branch8 (code, X86_CC_NZ, -1, 1);
1098 /* next case: synchronization->owner == TID */
1099 /* is synchronization->nest == 1 */
1100 amd64_alu_membase_imm_size (code, X86_CMP, AMD64_RCX, nest_offset, 1, 4);
1101 /* if not, jump to next case */
1103 amd64_branch8 (code, X86_CC_NZ, -1, 1);
1104 /* if yes, is synchronization->entry_count zero? */
1105 amd64_alu_membase_imm_size (code, X86_CMP, AMD64_RCX, entry_count_offset, 0, 4);
1106 /* if not, jump to actual trampoline */
1107 jump_have_waiters = code;
1108 amd64_branch8 (code, X86_CC_NZ, -1 , 1);
1109 /* if yes, set synchronization->owner to null and return */
1110 amd64_mov_membase_imm (code, AMD64_RCX, owner_offset, 0, 8);
1113 /* next case: synchronization->nest is not 1 */
1114 x86_patch (jump_next, code);
1115 /* decrease synchronization->nest and return */
1116 amd64_dec_membase_size (code, AMD64_RCX, nest_offset, 4);
1119 x86_patch (jump_obj_null, code);
1120 x86_patch (jump_have_waiters, code);
1121 x86_patch (jump_not_owned, code);
1122 x86_patch (jump_sync_null, code);
1125 /* jump to the actual trampoline */
1126 #if MONO_AMD64_ARG_REG1 != AMD64_RDI
1127 amd64_mov_reg_reg (code, MONO_AMD64_ARG_REG1, AMD64_RDI);
1131 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_monitor_exit");
1132 amd64_jump_reg (code, AMD64_R11);
1134 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_MONITOR_EXIT, mono_get_root_domain (), NULL);
1135 amd64_jump_code (code, tramp);
1138 nacl_global_codeman_validate (&buf, tramp_size, &code);
1140 mono_arch_flush_icache (code, code - buf);
1141 g_assert (code - buf <= tramp_size);
1144 *info = mono_tramp_info_create (g_strdup_printf ("monitor_exit_trampoline"), buf, code - buf, ji, unwind_ops);
1151 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
1153 /* FIXME: This is not thread safe */
1154 guint8 *code = ji->code_start;
1156 amd64_mov_reg_imm (code, AMD64_ARG_REG1, func_arg);
1157 amd64_mov_reg_imm (code, AMD64_R11, func);
1159 x86_push_imm (code, (guint64)func_arg);
1160 amd64_call_reg (code, AMD64_R11);
1165 handler_block_trampoline_helper (gpointer *ptr)
1167 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1168 *ptr = jit_tls->handler_block_return_address;
1172 mono_arch_create_handler_block_trampoline (void)
1174 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
1176 int tramp_size = 64;
1177 code = buf = mono_global_codeman_reserve (tramp_size);
1180 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
1183 if (mono_get_jit_tls_offset () != -1) {
1184 code = mono_amd64_emit_tls_get (code, AMD64_RDI, mono_get_jit_tls_offset ());
1186 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RDI, G_STRUCT_OFFSET (MonoJitTlsData, handler_block_return_address), 8);
1187 amd64_jump_code (code, tramp);
1189 /*Slow path uses a c helper*/
1190 amd64_mov_reg_reg (code, AMD64_RDI, AMD64_RSP, 8);
1191 amd64_mov_reg_imm (code, AMD64_RAX, tramp);
1192 amd64_push_reg (code, AMD64_RAX);
1193 amd64_jump_code (code, handler_block_trampoline_helper);
1196 mono_arch_flush_icache (buf, code - buf);
1197 g_assert (code - buf <= tramp_size);
1199 if (mono_jit_map_is_enabled ())
1200 mono_emit_jit_tramp (buf, code - buf, "handler_block_trampoline");
1206 * mono_arch_get_call_target:
1208 * Return the address called by the code before CODE if exists.
1211 mono_arch_get_call_target (guint8 *code)
1213 if (code [-5] == 0xe8) {
1214 guint32 disp = *(guint32*)(code - 4);
1215 guint8 *target = code + disp;
1224 * mono_arch_get_plt_info_offset:
1226 * Return the PLT info offset belonging to the plt entry PLT_ENTRY.
1229 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1231 #if defined(__native_client__) || defined(__native_client_codegen__)
1232 /* 18 = 3 (mov opcode) + 4 (disp) + 10 (nacljmp) + 1 (push opcode) */
1233 /* See aot-compiler.c arch_emit_plt_entry for details. */
1234 return *(guint32*)(plt_entry + 18);
1236 return *(guint32*)(plt_entry + 6);