2 * tramp-x86.c: JIT trampoline code for x86
5 * Dietmar Maurer (dietmar@ximian.com)
7 * (C) 2001 Ximian, Inc.
13 #include <mono/metadata/appdomain.h>
14 #include <mono/metadata/metadata-internals.h>
15 #include <mono/metadata/marshal.h>
16 #include <mono/metadata/tabledefs.h>
17 #include <mono/metadata/mono-debug.h>
18 #include <mono/metadata/mono-debug-debugger.h>
19 #include <mono/metadata/monitor.h>
20 #include <mono/arch/x86/x86-codegen.h>
22 #include <mono/utils/memcheck.h>
27 static guint8* nullified_class_init_trampoline;
30 * mono_arch_get_unbox_trampoline:
31 * @gsctx: the generic sharing context
33 * @addr: pointer to native code for @m
35 * when value type methods are called through the vtable we need to unbox the
36 * this argument. This method returns a pointer to a trampoline which does
37 * unboxing before calling the method
40 mono_arch_get_unbox_trampoline (MonoGenericSharingContext *gsctx, MonoMethod *m, gpointer addr)
44 MonoDomain *domain = mono_domain_get ();
46 if (MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
49 start = code = mono_domain_code_reserve (domain, 16);
51 x86_alu_membase_imm (code, X86_ADD, X86_ESP, this_pos, sizeof (MonoObject));
52 x86_jump_code (code, addr);
53 g_assert ((code - start) < 16);
59 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
64 MonoDomain *domain = mono_domain_get ();
68 start = code = mono_domain_code_reserve (domain, buf_len);
70 x86_mov_reg_imm (code, MONO_ARCH_RGCTX_REG, mrgctx);
71 x86_jump_code (code, addr);
72 g_assert ((code - start) <= buf_len);
74 mono_arch_flush_icache (start, code - start);
80 mono_arch_get_llvm_imt_trampoline (MonoDomain *domain, MonoMethod *m, int vt_offset)
88 start = code = mono_domain_code_reserve (domain, buf_len);
90 this_offset = mono_x86_get_this_arg_offset (NULL, mono_method_signature (m));
93 x86_mov_reg_imm (code, MONO_ARCH_IMT_REG, m);
95 x86_mov_reg_membase (code, X86_EAX, X86_ESP, this_offset + 4, 4);
96 /* Load vtable address */
97 x86_mov_reg_membase (code, X86_EAX, X86_EAX, 0, 4);
98 x86_jump_membase (code, X86_EAX, vt_offset);
100 g_assert ((code - start) < buf_len);
102 mono_arch_flush_icache (start, code - start);
108 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
112 gboolean can_write = mono_breakpoint_clean_code (method_start, orig_code, 8, buf, sizeof (buf));
116 /* go to the start of the call instruction
118 * address_byte = (m << 6) | (o << 3) | reg
119 * call opcode: 0xff address_byte displacement
125 if ((code [1] == 0xe8)) {
127 InterlockedExchange ((gint32*)(orig_code + 2), (guint)addr - ((guint)orig_code + 1) - 5);
129 /* Tell valgrind to recompile the patched code */
130 VALGRIND_DISCARD_TRANSLATIONS (orig_code + 2, 4);
132 } else if (code [1] == 0xe9) {
133 /* A PLT entry: jmp <DISP> */
135 InterlockedExchange ((gint32*)(orig_code + 2), (guint)addr - ((guint)orig_code + 1) - 5);
137 printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
138 code [4], code [5], code [6]);
139 g_assert_not_reached ();
144 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
148 /* Patch the jump table entry used by the plt entry */
150 /* A PLT entry: jmp *<DISP>(%ebx) */
151 g_assert (code [0] == 0xff);
152 g_assert (code [1] == 0xa3);
154 offset = *(guint32*)(code + 2);
157 got = (gpointer*)(gsize) regs [MONO_ARCH_GOT_REG];
158 *(guint8**)((guint8*)got + offset) = addr;
162 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
165 gboolean can_write = mono_breakpoint_clean_code (NULL, code, 6, buf, sizeof (buf));
171 if (code [0] == 0xe8) {
172 if (!mono_running_on_valgrind ()) {
175 * Thread safe code patching using the algorithm from the paper
176 * 'Practicing JUDO: Java Under Dynamic Optimizations'
179 * First atomically change the the first 2 bytes of the call to a
183 InterlockedExchange ((gint32*)code, ops);
185 /* Then change the other bytes to a nop */
190 /* Then atomically change the first 4 bytes to a nop as well */
192 InterlockedExchange ((gint32*)code, ops);
193 /* FIXME: the calltree skin trips on the self modifying code above */
195 /* Tell valgrind to recompile the patched code */
196 //VALGRIND_DISCARD_TRANSLATIONS (code, 8);
198 } else if (code [0] == 0x90 || code [0] == 0xeb) {
199 /* Already changed by another thread */
201 } else if ((code [-1] == 0xff) && (x86_modrm_reg (code [0]) == 0x2)) {
202 /* call *<OFFSET>(<REG>) -> Call made from AOT code */
203 gpointer *vtable_slot;
205 vtable_slot = mono_get_vcall_slot_addr (code + 5, regs);
206 g_assert (vtable_slot);
208 *vtable_slot = nullified_class_init_trampoline;
210 printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
211 code [4], code [5], code [6]);
212 g_assert_not_reached ();
217 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
219 if (mono_aot_only && !nullified_class_init_trampoline)
220 nullified_class_init_trampoline = mono_aot_get_named_code ("nullified_class_init_trampoline");
222 mono_arch_patch_plt_entry (code, NULL, regs, nullified_class_init_trampoline);
226 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
231 GSList *unwind_ops, *l;
233 code = mono_arch_create_trampoline_code_full (tramp_type, &code_size, &ji, &unwind_ops, FALSE);
235 mono_save_trampoline_xdebug_info ("<generic_trampoline>", code, code_size, unwind_ops);
237 for (l = unwind_ops; l; l = l->next)
239 g_slist_free (unwind_ops);
245 mono_arch_create_trampoline_code_full (MonoTrampolineType tramp_type, guint32 *code_size, MonoJumpInfo **ji, GSList **out_unwind_ops, gboolean aot)
247 guint8 *buf, *code, *tramp;
248 int pushed_args, pushed_args_caller_saved;
249 GSList *unwind_ops = NULL;
251 code = buf = mono_global_codeman_reserve (256);
255 /* Note that there is a single argument to the trampoline
256 * and it is stored at: esp + pushed_args * sizeof (gpointer)
257 * the ret address is at: esp + (pushed_args + 1) * sizeof (gpointer)
260 /* Put all registers into an array on the stack
261 * If this code is changed, make sure to update the offset value in
262 * mono_arch_get_this_arg_from_call () in mini-x86.c.
264 x86_push_reg (code, X86_EDI);
265 x86_push_reg (code, X86_ESI);
266 x86_push_reg (code, X86_EBP);
267 x86_push_reg (code, X86_ESP);
268 x86_push_reg (code, X86_EBX);
269 x86_push_reg (code, X86_EDX);
270 x86_push_reg (code, X86_ECX);
271 x86_push_reg (code, X86_EAX);
273 pushed_args_caller_saved = pushed_args = 8;
275 /* Align stack on apple */
276 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 4);
282 /* save the IP (caller ip) */
283 if (tramp_type == MONO_TRAMPOLINE_JUMP)
284 x86_push_imm (code, 0);
286 x86_push_membase (code, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
290 x86_push_reg (code, X86_EBP);
291 x86_push_reg (code, X86_ESI);
292 x86_push_reg (code, X86_EDI);
293 x86_push_reg (code, X86_EBX);
298 x86_push_reg (code, X86_ESP);
299 /* Adjust ESP so it points to the previous frame */
300 x86_alu_membase_imm (code, X86_ADD, X86_ESP, 0, (pushed_args + 2) * 4);
304 /* save method info */
305 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
306 x86_push_membase (code, X86_ESP, pushed_args * sizeof (gpointer));
308 x86_push_imm (code, 0);
312 /* On apple, the stack is correctly aligned to 16 bytes because pushed_args is
313 * 16 and there is the extra trampoline arg + the return ip pushed by call
314 * FIXME: Note that if an exception happens while some args are pushed
315 * on the stack, the stack will be misaligned.
317 g_assert (pushed_args == 16);
319 /* get the address of lmf for the current thread */
321 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
322 x86_call_reg (code, X86_EAX);
324 x86_call_code (code, mono_get_lmf_addr);
327 x86_push_reg (code, X86_EAX);
328 /* push *lfm (previous_lmf) */
329 x86_push_membase (code, X86_EAX, 0);
330 /* Signal to mono_arch_find_jit_info () that this is a trampoline frame */
331 x86_alu_membase_imm (code, X86_ADD, X86_ESP, 0, 1);
333 x86_mov_membase_reg (code, X86_EAX, 0, X86_ESP, 4);
338 /* starting the call sequence */
340 /* FIXME: Push the trampoline address */
341 x86_push_imm (code, 0);
345 /* push the method info */
346 x86_push_membase (code, X86_ESP, pushed_args * sizeof (gpointer));
350 /* push the return address onto the stack */
351 if (tramp_type == MONO_TRAMPOLINE_JUMP)
352 x86_push_imm (code, 0);
354 x86_push_membase (code, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
356 /* push the address of the register array */
357 x86_lea_membase (code, X86_EAX, X86_ESP, (pushed_args - 8) * sizeof (gpointer));
358 x86_push_reg (code, X86_EAX);
363 /* check the stack is aligned after the ret ip is pushed */
364 /*x86_mov_reg_reg (buf, X86_EDX, X86_ESP, 4);
365 x86_alu_reg_imm (buf, X86_AND, X86_EDX, 15);
366 x86_alu_reg_imm (buf, X86_CMP, X86_EDX, 0);
367 x86_branch_disp (buf, X86_CC_Z, 3, FALSE);
368 x86_breakpoint (buf);*/
372 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
373 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
374 x86_call_reg (code, X86_EAX);
376 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
377 x86_call_code (code, tramp);
380 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4*4);
384 /* Check for thread interruption */
385 /* This is not perf critical code so no need to check the interrupt flag */
386 /* Align the stack on osx */
387 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 3 * 4);
388 x86_push_reg (code, X86_EAX);
390 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
391 x86_call_reg (code, X86_EAX);
393 x86_call_code (code, (guint8*)mono_thread_force_interruption_checkpoint);
395 x86_pop_reg (code, X86_EAX);
396 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 3 * 4);
400 /* ebx = previous_lmf */
401 x86_pop_reg (code, X86_EBX);
403 x86_alu_reg_imm (code, X86_SUB, X86_EBX, 1);
406 x86_pop_reg (code, X86_EDI);
409 /* *(lmf) = previous_lmf */
410 x86_mov_membase_reg (code, X86_EDI, 0, X86_EBX, 4);
412 /* discard method info */
413 x86_pop_reg (code, X86_ESI);
417 x86_pop_reg (code, X86_ESI);
420 /* restore caller saved regs */
421 x86_pop_reg (code, X86_EBX);
422 x86_pop_reg (code, X86_EDI);
423 x86_pop_reg (code, X86_ESI);
424 x86_pop_reg (code, X86_EBP);
428 /* discard save IP */
429 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4);
432 /* restore LMF end */
434 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
436 * Overwrite the method ptr with the address we need to jump to,
439 x86_mov_membase_reg (code, X86_ESP, pushed_args * sizeof (gpointer), X86_EAX, 4);
442 /* Restore caller saved registers */
443 x86_mov_reg_membase (code, X86_ECX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_ECX) * 4, 4);
444 x86_mov_reg_membase (code, X86_EDX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EDX) * 4, 4);
445 if ((tramp_type == MONO_TRAMPOLINE_RESTORE_STACK_PROT) || (tramp_type == MONO_TRAMPOLINE_AOT_PLT))
446 x86_mov_reg_membase (code, X86_EAX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EAX) * 4, 4);
448 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
449 /* Pop saved reg array + stack align */
450 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 9 * 4);
452 g_assert (pushed_args == 0);
454 /* Pop saved reg array + stack align + method ptr */
455 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 10 * 4);
458 /* We've popped one more stack item than we've pushed (the
459 method ptr argument), so we must end up at -1. */
460 g_assert (pushed_args == -1);
465 g_assert ((code - buf) <= 256);
467 *code_size = code - buf;
469 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT) {
470 /* Initialize the nullified class init trampoline used in the AOT case */
471 nullified_class_init_trampoline = code = mono_global_codeman_reserve (16);
475 *out_unwind_ops = unwind_ops;
481 mono_arch_get_nullified_class_init_trampoline (guint32 *code_len)
485 code = buf = mono_global_codeman_reserve (16);
488 mono_arch_flush_icache (buf, code - buf);
490 *code_len = code - buf;
495 #define TRAMPOLINE_SIZE 10
498 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
500 guint8 *code, *buf, *tramp;
502 tramp = mono_get_trampoline_code (tramp_type);
504 code = buf = mono_domain_code_reserve_align (domain, TRAMPOLINE_SIZE, 4);
506 x86_push_imm (buf, arg1);
507 x86_jump_code (buf, tramp);
508 g_assert ((buf - code) <= TRAMPOLINE_SIZE);
510 mono_arch_flush_icache (code, buf - code);
513 *code_len = buf - code;
519 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot)
524 return mono_arch_create_rgctx_lazy_fetch_trampoline_full (slot, &code_size, &ji, FALSE);
528 mono_arch_create_rgctx_lazy_fetch_trampoline_full (guint32 slot, guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
532 guint8 **rgctx_null_jumps;
540 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
541 index = MONO_RGCTX_SLOT_INDEX (slot);
543 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
544 for (depth = 0; ; ++depth) {
545 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
547 if (index < size - 1)
552 tramp_size = (aot ? 64 : 36) + 6 * depth;
554 code = buf = mono_global_codeman_reserve (tramp_size);
556 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
558 /* load vtable/mrgctx ptr */
559 x86_mov_reg_membase (code, X86_EAX, X86_ESP, 4, 4);
561 /* load rgctx ptr from vtable */
562 x86_mov_reg_membase (code, X86_EAX, X86_EAX, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context), 4);
563 /* is the rgctx ptr null? */
564 x86_test_reg_reg (code, X86_EAX, X86_EAX);
565 /* if yes, jump to actual trampoline */
566 rgctx_null_jumps [0] = code;
567 x86_branch8 (code, X86_CC_Z, -1, 1);
570 for (i = 0; i < depth; ++i) {
571 /* load ptr to next array */
572 if (mrgctx && i == 0)
573 x86_mov_reg_membase (code, X86_EAX, X86_EAX, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT, 4);
575 x86_mov_reg_membase (code, X86_EAX, X86_EAX, 0, 4);
576 /* is the ptr null? */
577 x86_test_reg_reg (code, X86_EAX, X86_EAX);
578 /* if yes, jump to actual trampoline */
579 rgctx_null_jumps [i + 1] = code;
580 x86_branch8 (code, X86_CC_Z, -1, 1);
584 x86_mov_reg_membase (code, X86_EAX, X86_EAX, sizeof (gpointer) * (index + 1), 4);
585 /* is the slot null? */
586 x86_test_reg_reg (code, X86_EAX, X86_EAX);
587 /* if yes, jump to actual trampoline */
588 rgctx_null_jumps [depth + 1] = code;
589 x86_branch8 (code, X86_CC_Z, -1, 1);
590 /* otherwise return */
593 for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
594 x86_patch (rgctx_null_jumps [i], code);
596 g_free (rgctx_null_jumps);
598 x86_mov_reg_membase (code, MONO_ARCH_VTABLE_REG, X86_ESP, 4, 4);
601 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
602 x86_jump_reg (code, X86_EAX);
604 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
606 /* jump to the actual trampoline */
607 x86_jump_code (code, tramp);
610 mono_arch_flush_icache (buf, code - buf);
612 g_assert (code - buf <= tramp_size);
614 *code_size = code - buf;
620 mono_arch_create_generic_class_init_trampoline (void)
625 return mono_arch_create_generic_class_init_trampoline_full (&code_size, &ji, FALSE);
629 mono_arch_create_generic_class_init_trampoline_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
633 static int byte_offset = -1;
634 static guint8 bitmask;
640 code = buf = mono_global_codeman_reserve (tramp_size);
645 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
647 x86_test_membase_imm (code, MONO_ARCH_VTABLE_REG, byte_offset, bitmask);
649 x86_branch8 (code, X86_CC_Z, -1, 1);
653 x86_patch (jump, code);
655 /* Push the vtable so the stack is the same as in a specific trampoline */
656 x86_push_reg (code, MONO_ARCH_VTABLE_REG);
659 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_generic_class_init");
660 x86_jump_reg (code, X86_EAX);
662 tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
664 /* jump to the actual trampoline */
665 x86_jump_code (code, tramp);
668 mono_arch_flush_icache (code, code - buf);
670 g_assert (code - buf <= tramp_size);
675 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
677 * The code produced by this trampoline is equivalent to this:
680 * if (obj->synchronisation) {
681 * if (obj->synchronisation->owner == 0) {
682 * if (cmpxch (&obj->synchronisation->owner, TID, 0) == 0)
685 * if (obj->synchronisation->owner == TID) {
686 * ++obj->synchronisation->nest;
691 * return full_monitor_enter ();
695 mono_arch_create_monitor_enter_trampoline (void)
700 return mono_arch_create_monitor_enter_trampoline_full (&code_size, &ji, FALSE);
704 mono_arch_create_monitor_enter_trampoline_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
706 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
708 guint8 *jump_obj_null, *jump_sync_null, *jump_other_owner, *jump_cmpxchg_failed, *jump_tid;
710 int owner_offset, nest_offset, dummy;
714 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
716 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &dummy);
717 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
718 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
719 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
720 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
724 code = buf = mono_global_codeman_reserve (tramp_size);
726 if (mono_thread_get_tls_offset () != -1) {
727 /* MonoObject* obj is in EAX */
729 x86_test_reg_reg (code, X86_EAX, X86_EAX);
730 /* if yes, jump to actual trampoline */
731 jump_obj_null = code;
732 x86_branch8 (code, X86_CC_Z, -1, 1);
734 /* load obj->synchronization to ECX */
735 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
736 /* is synchronization null? */
737 x86_test_reg_reg (code, X86_ECX, X86_ECX);
738 /* if yes, jump to actual trampoline */
739 jump_sync_null = code;
740 x86_branch8 (code, X86_CC_Z, -1, 1);
742 /* load MonoInternalThread* into EDX */
743 code = mono_x86_emit_tls_get (code, X86_EDX, mono_thread_get_tls_offset ());
744 /* load TID into EDX */
745 x86_mov_reg_membase (code, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 4);
747 /* is synchronization->owner null? */
748 x86_alu_membase_imm (code, X86_CMP, X86_ECX, owner_offset, 0);
749 /* if not, jump to next case */
751 x86_branch8 (code, X86_CC_NZ, -1, 1);
753 /* if yes, try a compare-exchange with the TID */
754 /* free up register EAX, needed for the zero */
755 x86_push_reg (code, X86_EAX);
757 x86_alu_reg_reg (code, X86_XOR, X86_EAX, X86_EAX);
758 /* compare and exchange */
759 x86_prefix (code, X86_LOCK_PREFIX);
760 x86_cmpxchg_membase_reg (code, X86_ECX, owner_offset, X86_EDX);
761 /* if not successful, jump to actual trampoline */
762 jump_cmpxchg_failed = code;
763 x86_branch8 (code, X86_CC_NZ, -1, 1);
764 /* if successful, pop and return */
765 x86_pop_reg (code, X86_EAX);
768 /* next case: synchronization->owner is not null */
769 x86_patch (jump_tid, code);
770 /* is synchronization->owner == TID? */
771 x86_alu_membase_reg (code, X86_CMP, X86_ECX, owner_offset, X86_EDX);
772 /* if not, jump to actual trampoline */
773 jump_other_owner = code;
774 x86_branch8 (code, X86_CC_NZ, -1, 1);
775 /* if yes, increment nest */
776 x86_inc_membase (code, X86_ECX, nest_offset);
781 x86_patch (jump_obj_null, code);
782 x86_patch (jump_sync_null, code);
783 x86_patch (jump_other_owner, code);
784 x86_push_reg (code, X86_EAX);
785 /* jump to the actual trampoline */
786 x86_patch (jump_cmpxchg_failed, code);
788 /* We are calling the generic trampoline directly, the argument is pushed
789 * on the stack just like a specific trampoline.
791 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_enter");
792 x86_jump_reg (code, X86_EAX);
794 x86_jump_code (code, tramp);
797 /* push obj and jump to the actual trampoline */
798 x86_push_reg (code, X86_EAX);
800 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_enter");
801 x86_jump_reg (code, X86_EAX);
803 x86_jump_code (code, tramp);
807 mono_arch_flush_icache (buf, code - buf);
808 g_assert (code - buf <= tramp_size);
810 *code_size = code - buf;
816 mono_arch_create_monitor_exit_trampoline (void)
821 return mono_arch_create_monitor_exit_trampoline_full (&code_size, &ji, FALSE);
825 mono_arch_create_monitor_exit_trampoline_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
827 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
829 guint8 *jump_obj_null, *jump_have_waiters, *jump_sync_null, *jump_not_owned;
832 int owner_offset, nest_offset, entry_count_offset;
836 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
838 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &entry_count_offset);
839 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
840 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
841 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (entry_count_offset) == sizeof (gint32));
842 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
843 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
844 entry_count_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (entry_count_offset);
848 code = buf = mono_global_codeman_reserve (tramp_size);
850 if (mono_thread_get_tls_offset () != -1) {
851 /* MonoObject* obj is in EAX */
853 x86_test_reg_reg (code, X86_EAX, X86_EAX);
854 /* if yes, jump to actual trampoline */
855 jump_obj_null = code;
856 x86_branch8 (code, X86_CC_Z, -1, 1);
858 /* load obj->synchronization to ECX */
859 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
860 /* is synchronization null? */
861 x86_test_reg_reg (code, X86_ECX, X86_ECX);
862 /* if yes, jump to actual trampoline */
863 jump_sync_null = code;
864 x86_branch8 (code, X86_CC_Z, -1, 1);
866 /* next case: synchronization is not null */
867 /* load MonoInternalThread* into EDX */
868 code = mono_x86_emit_tls_get (code, X86_EDX, mono_thread_get_tls_offset ());
869 /* load TID into EDX */
870 x86_mov_reg_membase (code, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 4);
871 /* is synchronization->owner == TID */
872 x86_alu_membase_reg (code, X86_CMP, X86_ECX, owner_offset, X86_EDX);
873 /* if no, jump to actual trampoline */
874 jump_not_owned = code;
875 x86_branch8 (code, X86_CC_NZ, -1, 1);
877 /* next case: synchronization->owner == TID */
878 /* is synchronization->nest == 1 */
879 x86_alu_membase_imm (code, X86_CMP, X86_ECX, nest_offset, 1);
880 /* if not, jump to next case */
882 x86_branch8 (code, X86_CC_NZ, -1, 1);
883 /* if yes, is synchronization->entry_count zero? */
884 x86_alu_membase_imm (code, X86_CMP, X86_ECX, entry_count_offset, 0);
885 /* if not, jump to actual trampoline */
886 jump_have_waiters = code;
887 x86_branch8 (code, X86_CC_NZ, -1 , 1);
888 /* if yes, set synchronization->owner to null and return */
889 x86_mov_membase_imm (code, X86_ECX, owner_offset, 0, 4);
892 /* next case: synchronization->nest is not 1 */
893 x86_patch (jump_next, code);
894 /* decrease synchronization->nest and return */
895 x86_dec_membase (code, X86_ECX, nest_offset);
898 /* push obj and jump to the actual trampoline */
899 x86_patch (jump_obj_null, code);
900 x86_patch (jump_have_waiters, code);
901 x86_patch (jump_not_owned, code);
902 x86_patch (jump_sync_null, code);
905 /* push obj and jump to the actual trampoline */
906 x86_push_reg (code, X86_EAX);
908 code = mono_arch_emit_load_aotconst (buf, code, ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_exit");
909 x86_jump_reg (code, X86_EAX);
911 x86_jump_code (code, tramp);
914 mono_arch_flush_icache (buf, code - buf);
915 g_assert (code - buf <= tramp_size);
917 *code_size = code - buf;
923 mono_arch_create_monitor_enter_trampoline (void)
925 g_assert_not_reached ();
930 mono_arch_create_monitor_exit_trampoline (void)
932 g_assert_not_reached ();
938 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
940 /* FIXME: This is not thread safe */
941 guint8 *code = ji->code_start;
943 x86_push_imm (code, func_arg);
944 x86_call_code (code, (guint8*)func);
948 handler_block_trampoline_helper (gpointer *ptr)
950 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
951 *ptr = jit_tls->handler_block_return_address;
955 mono_arch_create_handler_block_trampoline (void)
957 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
960 code = buf = mono_global_codeman_reserve (tramp_size);
963 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
966 if (mono_get_jit_tls_offset () != -1) {
967 code = mono_x86_emit_tls_get (code, X86_EAX, mono_get_jit_tls_offset ());
968 x86_mov_reg_membase (code, X86_EAX, X86_EAX, G_STRUCT_OFFSET (MonoJitTlsData, handler_block_return_address), 4);
970 x86_push_reg (code, X86_EAX);
971 x86_jump_code (code, tramp);
973 /*Slow path uses a c helper*/
974 x86_push_reg (code, X86_ESP);
975 x86_push_imm (code, tramp);
976 x86_jump_code (code, handler_block_trampoline_helper);
979 mono_arch_flush_icache (buf, code - buf);
980 g_assert (code - buf <= tramp_size);