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_trampoline ("nullified_class_init_trampoline");
222 mono_arch_patch_plt_entry (code, NULL, regs, nullified_class_init_trampoline);
226 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
228 guint8 *buf, *code, *tramp;
229 int pushed_args, pushed_args_caller_saved;
230 GSList *unwind_ops = NULL;
231 MonoJumpInfo *ji = NULL;
233 unwind_ops = mono_arch_get_cie_program ();
235 code = buf = mono_global_codeman_reserve (256);
237 /* Note that there is a single argument to the trampoline
238 * and it is stored at: esp + pushed_args * sizeof (gpointer)
239 * the ret address is at: esp + (pushed_args + 1) * sizeof (gpointer)
242 /* Put all registers into an array on the stack
243 * If this code is changed, make sure to update the offset value in
244 * mono_arch_get_this_arg_from_call () in mini-x86.c.
246 x86_push_reg (code, X86_EDI);
247 x86_push_reg (code, X86_ESI);
248 x86_push_reg (code, X86_EBP);
249 x86_push_reg (code, X86_ESP);
250 x86_push_reg (code, X86_EBX);
251 x86_push_reg (code, X86_EDX);
252 x86_push_reg (code, X86_ECX);
253 x86_push_reg (code, X86_EAX);
255 pushed_args_caller_saved = pushed_args = 8;
257 /* Align stack on apple */
258 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 4);
264 /* save the IP (caller ip) */
265 if (tramp_type == MONO_TRAMPOLINE_JUMP)
266 x86_push_imm (code, 0);
268 x86_push_membase (code, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
272 x86_push_reg (code, X86_EBP);
273 x86_push_reg (code, X86_ESI);
274 x86_push_reg (code, X86_EDI);
275 x86_push_reg (code, X86_EBX);
280 x86_push_reg (code, X86_ESP);
281 /* Adjust ESP so it points to the previous frame */
282 x86_alu_membase_imm (code, X86_ADD, X86_ESP, 0, (pushed_args + 2) * 4);
286 /* save method info */
287 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
288 x86_push_membase (code, X86_ESP, pushed_args * sizeof (gpointer));
290 x86_push_imm (code, 0);
294 /* On apple, the stack is correctly aligned to 16 bytes because pushed_args is
295 * 16 and there is the extra trampoline arg + the return ip pushed by call
296 * FIXME: Note that if an exception happens while some args are pushed
297 * on the stack, the stack will be misaligned.
299 g_assert (pushed_args == 16);
301 /* get the address of lmf for the current thread */
303 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
304 x86_call_reg (code, X86_EAX);
306 x86_call_code (code, mono_get_lmf_addr);
309 x86_push_reg (code, X86_EAX);
310 /* push *lfm (previous_lmf) */
311 x86_push_membase (code, X86_EAX, 0);
312 /* Signal to mono_arch_find_jit_info () that this is a trampoline frame */
313 x86_alu_membase_imm (code, X86_ADD, X86_ESP, 0, 1);
315 x86_mov_membase_reg (code, X86_EAX, 0, X86_ESP, 4);
320 /* starting the call sequence */
322 /* FIXME: Push the trampoline address */
323 x86_push_imm (code, 0);
327 /* push the method info */
328 x86_push_membase (code, X86_ESP, pushed_args * sizeof (gpointer));
332 /* push the return address onto the stack */
333 if (tramp_type == MONO_TRAMPOLINE_JUMP)
334 x86_push_imm (code, 0);
336 x86_push_membase (code, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
338 /* push the address of the register array */
339 x86_lea_membase (code, X86_EAX, X86_ESP, (pushed_args - 8) * sizeof (gpointer));
340 x86_push_reg (code, X86_EAX);
345 /* check the stack is aligned after the ret ip is pushed */
346 /*x86_mov_reg_reg (buf, X86_EDX, X86_ESP, 4);
347 x86_alu_reg_imm (buf, X86_AND, X86_EDX, 15);
348 x86_alu_reg_imm (buf, X86_CMP, X86_EDX, 0);
349 x86_branch_disp (buf, X86_CC_Z, 3, FALSE);
350 x86_breakpoint (buf);*/
353 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, X86_ESP, ((pushed_args + 2) * 4));
356 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
357 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
358 x86_call_reg (code, X86_EAX);
360 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
361 x86_call_code (code, tramp);
364 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4*4);
368 /* Check for thread interruption */
369 /* This is not perf critical code so no need to check the interrupt flag */
370 /* Align the stack on osx */
371 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 3 * 4);
372 x86_push_reg (code, X86_EAX);
374 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
375 x86_call_reg (code, X86_EAX);
377 x86_call_code (code, (guint8*)mono_thread_force_interruption_checkpoint);
379 x86_pop_reg (code, X86_EAX);
380 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 3 * 4);
384 /* ebx = previous_lmf */
385 x86_pop_reg (code, X86_EBX);
387 x86_alu_reg_imm (code, X86_SUB, X86_EBX, 1);
390 x86_pop_reg (code, X86_EDI);
393 /* *(lmf) = previous_lmf */
394 x86_mov_membase_reg (code, X86_EDI, 0, X86_EBX, 4);
396 /* discard method info */
397 x86_pop_reg (code, X86_ESI);
401 x86_pop_reg (code, X86_ESI);
404 /* restore caller saved regs */
405 x86_pop_reg (code, X86_EBX);
406 x86_pop_reg (code, X86_EDI);
407 x86_pop_reg (code, X86_ESI);
408 x86_pop_reg (code, X86_EBP);
412 /* discard save IP */
413 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4);
416 /* restore LMF end */
418 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
420 * Overwrite the method ptr with the address we need to jump to,
423 x86_mov_membase_reg (code, X86_ESP, pushed_args * sizeof (gpointer), X86_EAX, 4);
426 /* Restore caller saved registers */
427 x86_mov_reg_membase (code, X86_ECX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_ECX) * 4, 4);
428 x86_mov_reg_membase (code, X86_EDX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EDX) * 4, 4);
429 if ((tramp_type == MONO_TRAMPOLINE_RESTORE_STACK_PROT) || (tramp_type == MONO_TRAMPOLINE_AOT_PLT))
430 x86_mov_reg_membase (code, X86_EAX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EAX) * 4, 4);
432 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
433 /* Pop saved reg array + stack align */
434 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 9 * 4);
436 g_assert (pushed_args == 0);
438 /* Pop saved reg array + stack align + method ptr */
439 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 10 * 4);
442 /* We've popped one more stack item than we've pushed (the
443 method ptr argument), so we must end up at -1. */
444 g_assert (pushed_args == -1);
449 g_assert ((code - buf) <= 256);
452 *info = mono_tramp_info_create (g_strdup_printf ("generic_trampoline_%d", tramp_type), buf, code - buf, ji, unwind_ops);
454 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT) {
455 /* Initialize the nullified class init trampoline used in the AOT case */
456 nullified_class_init_trampoline = mono_arch_get_nullified_class_init_trampoline (NULL);
463 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
467 code = buf = mono_global_codeman_reserve (16);
470 mono_arch_flush_icache (buf, code - buf);
473 *info = mono_tramp_info_create (g_strdup_printf ("nullified_class_init_trampoline"), buf, code - buf, NULL, NULL);
478 #define TRAMPOLINE_SIZE 10
481 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
483 guint8 *code, *buf, *tramp;
485 tramp = mono_get_trampoline_code (tramp_type);
487 code = buf = mono_domain_code_reserve_align (domain, TRAMPOLINE_SIZE, 4);
489 x86_push_imm (buf, arg1);
490 x86_jump_code (buf, tramp);
491 g_assert ((buf - code) <= TRAMPOLINE_SIZE);
493 mono_arch_flush_icache (code, buf - code);
496 *code_len = buf - code;
502 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
506 guint8 **rgctx_null_jumps;
511 MonoJumpInfo *ji = NULL;
512 GSList *unwind_ops = NULL;
514 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
515 index = MONO_RGCTX_SLOT_INDEX (slot);
517 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
518 for (depth = 0; ; ++depth) {
519 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
521 if (index < size - 1)
526 tramp_size = (aot ? 64 : 36) + 6 * depth;
528 code = buf = mono_global_codeman_reserve (tramp_size);
530 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
532 /* load vtable/mrgctx ptr */
533 x86_mov_reg_membase (code, X86_EAX, X86_ESP, 4, 4);
535 /* load rgctx ptr from vtable */
536 x86_mov_reg_membase (code, X86_EAX, X86_EAX, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context), 4);
537 /* is the rgctx ptr null? */
538 x86_test_reg_reg (code, X86_EAX, X86_EAX);
539 /* if yes, jump to actual trampoline */
540 rgctx_null_jumps [0] = code;
541 x86_branch8 (code, X86_CC_Z, -1, 1);
544 for (i = 0; i < depth; ++i) {
545 /* load ptr to next array */
546 if (mrgctx && i == 0)
547 x86_mov_reg_membase (code, X86_EAX, X86_EAX, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT, 4);
549 x86_mov_reg_membase (code, X86_EAX, X86_EAX, 0, 4);
550 /* is the ptr null? */
551 x86_test_reg_reg (code, X86_EAX, X86_EAX);
552 /* if yes, jump to actual trampoline */
553 rgctx_null_jumps [i + 1] = code;
554 x86_branch8 (code, X86_CC_Z, -1, 1);
558 x86_mov_reg_membase (code, X86_EAX, X86_EAX, sizeof (gpointer) * (index + 1), 4);
559 /* is the slot null? */
560 x86_test_reg_reg (code, X86_EAX, X86_EAX);
561 /* if yes, jump to actual trampoline */
562 rgctx_null_jumps [depth + 1] = code;
563 x86_branch8 (code, X86_CC_Z, -1, 1);
564 /* otherwise return */
567 for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
568 x86_patch (rgctx_null_jumps [i], code);
570 g_free (rgctx_null_jumps);
572 x86_mov_reg_membase (code, MONO_ARCH_VTABLE_REG, X86_ESP, 4, 4);
575 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
576 x86_jump_reg (code, X86_EAX);
578 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
580 /* jump to the actual trampoline */
581 x86_jump_code (code, tramp);
584 mono_arch_flush_icache (buf, code - buf);
586 g_assert (code - buf <= tramp_size);
589 *info = mono_tramp_info_create (g_strdup_printf ("rgctx_fetch_trampoline_%u", slot), buf, code - buf, ji, unwind_ops);
595 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
599 static int byte_offset = -1;
600 static guint8 bitmask;
603 GSList *unwind_ops = NULL;
604 MonoJumpInfo *ji = NULL;
608 code = buf = mono_global_codeman_reserve (tramp_size);
611 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
613 x86_test_membase_imm (code, MONO_ARCH_VTABLE_REG, byte_offset, bitmask);
615 x86_branch8 (code, X86_CC_Z, -1, 1);
619 x86_patch (jump, code);
621 /* Push the vtable so the stack is the same as in a specific trampoline */
622 x86_push_reg (code, MONO_ARCH_VTABLE_REG);
625 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_generic_class_init");
626 x86_jump_reg (code, X86_EAX);
628 tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
630 /* jump to the actual trampoline */
631 x86_jump_code (code, tramp);
634 mono_arch_flush_icache (code, code - buf);
636 g_assert (code - buf <= tramp_size);
639 *info = mono_tramp_info_create (g_strdup_printf ("generic_class_init_trampoline"), buf, code - buf, ji, unwind_ops);
644 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
646 * The code produced by this trampoline is equivalent to this:
649 * if (obj->synchronisation) {
650 * if (obj->synchronisation->owner == 0) {
651 * if (cmpxch (&obj->synchronisation->owner, TID, 0) == 0)
654 * if (obj->synchronisation->owner == TID) {
655 * ++obj->synchronisation->nest;
660 * return full_monitor_enter ();
664 mono_arch_create_monitor_enter_trampoline (MonoTrampInfo **info, gboolean aot)
666 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
668 guint8 *jump_obj_null, *jump_sync_null, *jump_other_owner, *jump_cmpxchg_failed, *jump_tid;
670 int owner_offset, nest_offset, dummy;
671 MonoJumpInfo *ji = NULL;
672 GSList *unwind_ops = NULL;
674 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
676 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &dummy);
677 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
678 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
679 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
680 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
684 code = buf = mono_global_codeman_reserve (tramp_size);
686 if (mono_thread_get_tls_offset () != -1) {
687 /* MonoObject* obj is in EAX */
689 x86_test_reg_reg (code, X86_EAX, X86_EAX);
690 /* if yes, jump to actual trampoline */
691 jump_obj_null = code;
692 x86_branch8 (code, X86_CC_Z, -1, 1);
694 /* load obj->synchronization to ECX */
695 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
696 /* is synchronization null? */
697 x86_test_reg_reg (code, X86_ECX, X86_ECX);
698 /* if yes, jump to actual trampoline */
699 jump_sync_null = code;
700 x86_branch8 (code, X86_CC_Z, -1, 1);
702 /* load MonoInternalThread* into EDX */
703 code = mono_x86_emit_tls_get (code, X86_EDX, mono_thread_get_tls_offset ());
704 /* load TID into EDX */
705 x86_mov_reg_membase (code, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 4);
707 /* is synchronization->owner null? */
708 x86_alu_membase_imm (code, X86_CMP, X86_ECX, owner_offset, 0);
709 /* if not, jump to next case */
711 x86_branch8 (code, X86_CC_NZ, -1, 1);
713 /* if yes, try a compare-exchange with the TID */
714 /* free up register EAX, needed for the zero */
715 x86_push_reg (code, X86_EAX);
717 x86_alu_reg_reg (code, X86_XOR, X86_EAX, X86_EAX);
718 /* compare and exchange */
719 x86_prefix (code, X86_LOCK_PREFIX);
720 x86_cmpxchg_membase_reg (code, X86_ECX, owner_offset, X86_EDX);
721 /* if not successful, jump to actual trampoline */
722 jump_cmpxchg_failed = code;
723 x86_branch8 (code, X86_CC_NZ, -1, 1);
724 /* if successful, pop and return */
725 x86_pop_reg (code, X86_EAX);
728 /* next case: synchronization->owner is not null */
729 x86_patch (jump_tid, code);
730 /* is synchronization->owner == TID? */
731 x86_alu_membase_reg (code, X86_CMP, X86_ECX, owner_offset, X86_EDX);
732 /* if not, jump to actual trampoline */
733 jump_other_owner = code;
734 x86_branch8 (code, X86_CC_NZ, -1, 1);
735 /* if yes, increment nest */
736 x86_inc_membase (code, X86_ECX, nest_offset);
741 x86_patch (jump_obj_null, code);
742 x86_patch (jump_sync_null, code);
743 x86_patch (jump_other_owner, code);
744 x86_push_reg (code, X86_EAX);
745 /* jump to the actual trampoline */
746 x86_patch (jump_cmpxchg_failed, code);
748 /* We are calling the generic trampoline directly, the argument is pushed
749 * on the stack just like a specific trampoline.
751 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_enter");
752 x86_jump_reg (code, X86_EAX);
754 x86_jump_code (code, tramp);
757 /* push obj and jump to the actual trampoline */
758 x86_push_reg (code, X86_EAX);
760 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_enter");
761 x86_jump_reg (code, X86_EAX);
763 x86_jump_code (code, tramp);
767 mono_arch_flush_icache (buf, code - buf);
768 g_assert (code - buf <= tramp_size);
771 *info = mono_tramp_info_create (g_strdup_printf ("monitor_enter_trampoline"), buf, code - buf, ji, unwind_ops);
777 mono_arch_create_monitor_exit_trampoline (MonoTrampInfo **info, gboolean aot)
779 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
781 guint8 *jump_obj_null, *jump_have_waiters, *jump_sync_null, *jump_not_owned;
784 int owner_offset, nest_offset, entry_count_offset;
785 MonoJumpInfo *ji = NULL;
786 GSList *unwind_ops = NULL;
788 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
790 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &entry_count_offset);
791 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
792 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
793 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (entry_count_offset) == sizeof (gint32));
794 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
795 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
796 entry_count_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (entry_count_offset);
800 code = buf = mono_global_codeman_reserve (tramp_size);
802 if (mono_thread_get_tls_offset () != -1) {
803 /* MonoObject* obj is in EAX */
805 x86_test_reg_reg (code, X86_EAX, X86_EAX);
806 /* if yes, jump to actual trampoline */
807 jump_obj_null = code;
808 x86_branch8 (code, X86_CC_Z, -1, 1);
810 /* load obj->synchronization to ECX */
811 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
812 /* is synchronization null? */
813 x86_test_reg_reg (code, X86_ECX, X86_ECX);
814 /* if yes, jump to actual trampoline */
815 jump_sync_null = code;
816 x86_branch8 (code, X86_CC_Z, -1, 1);
818 /* next case: synchronization is not null */
819 /* load MonoInternalThread* into EDX */
820 code = mono_x86_emit_tls_get (code, X86_EDX, mono_thread_get_tls_offset ());
821 /* load TID into EDX */
822 x86_mov_reg_membase (code, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 4);
823 /* is synchronization->owner == TID */
824 x86_alu_membase_reg (code, X86_CMP, X86_ECX, owner_offset, X86_EDX);
825 /* if no, jump to actual trampoline */
826 jump_not_owned = code;
827 x86_branch8 (code, X86_CC_NZ, -1, 1);
829 /* next case: synchronization->owner == TID */
830 /* is synchronization->nest == 1 */
831 x86_alu_membase_imm (code, X86_CMP, X86_ECX, nest_offset, 1);
832 /* if not, jump to next case */
834 x86_branch8 (code, X86_CC_NZ, -1, 1);
835 /* if yes, is synchronization->entry_count zero? */
836 x86_alu_membase_imm (code, X86_CMP, X86_ECX, entry_count_offset, 0);
837 /* if not, jump to actual trampoline */
838 jump_have_waiters = code;
839 x86_branch8 (code, X86_CC_NZ, -1 , 1);
840 /* if yes, set synchronization->owner to null and return */
841 x86_mov_membase_imm (code, X86_ECX, owner_offset, 0, 4);
844 /* next case: synchronization->nest is not 1 */
845 x86_patch (jump_next, code);
846 /* decrease synchronization->nest and return */
847 x86_dec_membase (code, X86_ECX, nest_offset);
850 /* push obj and jump to the actual trampoline */
851 x86_patch (jump_obj_null, code);
852 x86_patch (jump_have_waiters, code);
853 x86_patch (jump_not_owned, code);
854 x86_patch (jump_sync_null, code);
857 /* push obj and jump to the actual trampoline */
858 x86_push_reg (code, X86_EAX);
860 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_exit");
861 x86_jump_reg (code, X86_EAX);
863 x86_jump_code (code, tramp);
866 mono_arch_flush_icache (buf, code - buf);
867 g_assert (code - buf <= tramp_size);
870 *info = mono_tramp_info_create (g_strdup_printf ("monitor_exit_trampoline"), buf, code - buf, ji, unwind_ops);
878 mono_arch_create_monitor_enter_trampoline (MonoTrampInfo **info, gboolean aot)
880 g_assert_not_reached ();
885 mono_arch_create_monitor_exit_trampoline (MonoTrampInfo **info, gboolean aot)
887 g_assert_not_reached ();
894 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
896 /* FIXME: This is not thread safe */
897 guint8 *code = ji->code_start;
899 x86_push_imm (code, func_arg);
900 x86_call_code (code, (guint8*)func);
904 handler_block_trampoline_helper (gpointer *ptr)
906 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
907 *ptr = jit_tls->handler_block_return_address;
911 mono_arch_create_handler_block_trampoline (void)
913 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
916 code = buf = mono_global_codeman_reserve (tramp_size);
919 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
922 if (mono_get_jit_tls_offset () != -1) {
923 code = mono_x86_emit_tls_get (code, X86_EAX, mono_get_jit_tls_offset ());
924 x86_mov_reg_membase (code, X86_EAX, X86_EAX, G_STRUCT_OFFSET (MonoJitTlsData, handler_block_return_address), 4);
926 x86_push_reg (code, X86_EAX);
927 x86_jump_code (code, tramp);
929 /*Slow path uses a c helper*/
930 x86_push_reg (code, X86_ESP);
931 x86_push_imm (code, tramp);
932 x86_jump_code (code, handler_block_trampoline_helper);
935 mono_arch_flush_icache (buf, code - buf);
936 g_assert (code - buf <= tramp_size);
942 mono_arch_get_call_target (guint8 *code)
944 if (code [-5] == 0xe8) {
945 guint32 disp = *(guint32*)(code - 4);
946 guint8 *target = code + disp;
955 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
957 return *(guint32*)(plt_entry + 6);