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/metadata/gc-internal.h>
21 #include <mono/arch/x86/x86-codegen.h>
23 #include <mono/utils/memcheck.h>
28 static guint8* nullified_class_init_trampoline;
31 * mono_arch_get_unbox_trampoline:
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 (MonoMethod *m, gpointer addr)
44 MonoDomain *domain = mono_domain_get ();
46 start = code = mono_domain_code_reserve (domain, 16);
48 x86_alu_membase_imm (code, X86_ADD, X86_ESP, this_pos, sizeof (MonoObject));
49 x86_jump_code (code, addr);
50 g_assert ((code - start) < 16);
56 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
61 MonoDomain *domain = mono_domain_get ();
65 start = code = mono_domain_code_reserve (domain, buf_len);
67 x86_mov_reg_imm (code, MONO_ARCH_RGCTX_REG, mrgctx);
68 x86_jump_code (code, addr);
69 g_assert ((code - start) <= buf_len);
71 mono_arch_flush_icache (start, code - start);
77 mono_arch_get_llvm_imt_trampoline (MonoDomain *domain, MonoMethod *m, int vt_offset)
85 start = code = mono_domain_code_reserve (domain, buf_len);
87 this_offset = mono_x86_get_this_arg_offset (NULL, mono_method_signature (m));
90 x86_mov_reg_imm (code, MONO_ARCH_IMT_REG, m);
92 x86_mov_reg_membase (code, X86_EAX, X86_ESP, this_offset + 4, 4);
93 /* Load vtable address */
94 x86_mov_reg_membase (code, X86_EAX, X86_EAX, 0, 4);
95 x86_jump_membase (code, X86_EAX, vt_offset);
97 g_assert ((code - start) < buf_len);
99 mono_arch_flush_icache (start, code - start);
105 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
109 gboolean can_write = mono_breakpoint_clean_code (method_start, orig_code, 8, buf, sizeof (buf));
113 /* go to the start of the call instruction
115 * address_byte = (m << 6) | (o << 3) | reg
116 * call opcode: 0xff address_byte displacement
122 if ((code [1] == 0xe8)) {
124 InterlockedExchange ((gint32*)(orig_code + 2), (guint)addr - ((guint)orig_code + 1) - 5);
126 /* Tell valgrind to recompile the patched code */
127 VALGRIND_DISCARD_TRANSLATIONS (orig_code + 2, 4);
129 } else if (code [1] == 0xe9) {
130 /* A PLT entry: jmp <DISP> */
132 InterlockedExchange ((gint32*)(orig_code + 2), (guint)addr - ((guint)orig_code + 1) - 5);
134 printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
135 code [4], code [5], code [6]);
136 g_assert_not_reached ();
141 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
145 /* Patch the jump table entry used by the plt entry */
147 #if defined(__native_client_codegen__) || defined(__native_client__)
148 /* for both compiler and runtime */
150 /* mov <DISP>(%ebx), %ecx */
151 /* and 0xffffffe0, %ecx */
153 g_assert (code [0] == 0x8b);
154 g_assert (code [1] == 0x8b);
156 offset = *(guint32*)(code + 2);
158 /* A PLT entry: jmp *<DISP>(%ebx) */
159 g_assert (code [0] == 0xff);
160 g_assert (code [1] == 0xa3);
162 offset = *(guint32*)(code + 2);
163 #endif /* __native_client_codegen__ */
165 got = (gpointer*)(gsize) regs [MONO_ARCH_GOT_REG];
166 *(guint8**)((guint8*)got + offset) = addr;
170 get_vcall_slot (guint8 *code, mgreg_t *regs, int *displacement)
172 const int kBufSize = NACL_SIZE (8, 16);
177 mono_breakpoint_clean_code (NULL, code, kBufSize, buf, kBufSize);
182 if ((code [0] == 0xff) && ((code [1] & 0x18) == 0x10) && ((code [1] >> 6) == 2)) {
183 reg = code [1] & 0x07;
184 disp = *((gint32*)(code + 2));
185 #if defined(__native_client_codegen__) || defined(__native_client__)
186 } else if ((code[1] == 0x83) && (code[2] == 0xe1) && (code[4] == 0xff) &&
187 (code[5] == 0xd1) && (code[-5] == 0x8b)) {
188 disp = *((gint32*)(code - 3));
189 reg = code[-4] & 0x07;
190 } else if ((code[-2] == 0x8b) && (code[1] == 0x83) && (code[4] == 0xff)) {
191 reg = code[-1] & 0x07;
192 disp = (signed char)code[0];
195 g_assert_not_reached ();
199 *displacement = disp;
200 return (gpointer)regs [reg];
204 get_vcall_slot_addr (guint8* code, mgreg_t *regs)
208 vt = get_vcall_slot (code, regs, &displacement);
211 return (gpointer*)((char*)vt + displacement);
215 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
218 gboolean can_write = mono_breakpoint_clean_code (NULL, code, 6, buf, sizeof (buf));
224 if (code [0] == 0xe8) {
225 if (!mono_running_on_valgrind ()) {
228 * Thread safe code patching using the algorithm from the paper
229 * 'Practicing JUDO: Java Under Dynamic Optimizations'
232 * First atomically change the the first 2 bytes of the call to a
236 InterlockedExchange ((gint32*)code, ops);
238 /* Then change the other bytes to a nop */
243 /* Then atomically change the first 4 bytes to a nop as well */
245 InterlockedExchange ((gint32*)code, ops);
246 /* FIXME: the calltree skin trips on the self modifying code above */
248 /* Tell valgrind to recompile the patched code */
249 //VALGRIND_DISCARD_TRANSLATIONS (code, 8);
251 } else if (code [0] == 0x90 || code [0] == 0xeb) {
252 /* Already changed by another thread */
254 } else if ((code [-1] == 0xff) && (x86_modrm_reg (code [0]) == 0x2)) {
255 /* call *<OFFSET>(<REG>) -> Call made from AOT code */
256 gpointer *vtable_slot;
258 vtable_slot = get_vcall_slot_addr (code + 5, regs);
259 g_assert (vtable_slot);
261 *vtable_slot = nullified_class_init_trampoline;
263 printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
264 code [4], code [5], code [6]);
265 g_assert_not_reached ();
270 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
272 if (mono_aot_only && !nullified_class_init_trampoline)
273 nullified_class_init_trampoline = mono_aot_get_trampoline ("nullified_class_init_trampoline");
275 mono_arch_patch_plt_entry (code, NULL, regs, nullified_class_init_trampoline);
279 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
281 guint8 *buf, *code, *tramp;
282 int pushed_args, pushed_args_caller_saved;
283 GSList *unwind_ops = NULL;
284 MonoJumpInfo *ji = NULL;
286 unwind_ops = mono_arch_get_cie_program ();
288 code = buf = mono_global_codeman_reserve (256);
290 /* Note that there is a single argument to the trampoline
291 * and it is stored at: esp + pushed_args * sizeof (gpointer)
292 * the ret address is at: esp + (pushed_args + 1) * sizeof (gpointer)
295 /* Put all registers into an array on the stack
296 * If this code is changed, make sure to update the offset value in
297 * mono_arch_get_this_arg_from_call () in mini-x86.c.
299 x86_push_reg (code, X86_EDI);
300 x86_push_reg (code, X86_ESI);
301 x86_push_reg (code, X86_EBP);
302 x86_push_reg (code, X86_ESP);
303 x86_push_reg (code, X86_EBX);
304 x86_push_reg (code, X86_EDX);
305 x86_push_reg (code, X86_ECX);
306 x86_push_reg (code, X86_EAX);
308 pushed_args_caller_saved = pushed_args = 8;
310 /* Align stack on apple */
311 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 4);
317 /* save the IP (caller ip) */
318 if (tramp_type == MONO_TRAMPOLINE_JUMP)
319 x86_push_imm (code, 0);
321 x86_push_membase (code, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
325 x86_push_reg (code, X86_EBP);
326 x86_push_reg (code, X86_ESI);
327 x86_push_reg (code, X86_EDI);
328 x86_push_reg (code, X86_EBX);
333 x86_push_reg (code, X86_ESP);
334 /* Adjust ESP so it points to the previous frame */
335 x86_alu_membase_imm (code, X86_ADD, X86_ESP, 0, (pushed_args + 2) * 4);
339 /* save method info */
340 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
341 x86_push_membase (code, X86_ESP, pushed_args * sizeof (gpointer));
343 x86_push_imm (code, 0);
347 /* On apple, the stack is correctly aligned to 16 bytes because pushed_args is
348 * 16 and there is the extra trampoline arg + the return ip pushed by call
349 * FIXME: Note that if an exception happens while some args are pushed
350 * on the stack, the stack will be misaligned.
352 g_assert (pushed_args == 16);
354 /* get the address of lmf for the current thread */
356 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
357 x86_call_reg (code, X86_EAX);
359 x86_call_code (code, mono_get_lmf_addr);
362 x86_push_reg (code, X86_EAX);
363 /* push *lfm (previous_lmf) */
364 x86_push_membase (code, X86_EAX, 0);
365 /* Signal to mono_arch_find_jit_info () that this is a trampoline frame */
366 x86_alu_membase_imm (code, X86_ADD, X86_ESP, 0, 1);
368 x86_mov_membase_reg (code, X86_EAX, 0, X86_ESP, 4);
373 /* starting the call sequence */
375 /* FIXME: Push the trampoline address */
376 x86_push_imm (code, 0);
380 /* push the method info */
381 x86_push_membase (code, X86_ESP, pushed_args * sizeof (gpointer));
385 /* push the return address onto the stack */
386 if (tramp_type == MONO_TRAMPOLINE_JUMP)
387 x86_push_imm (code, 0);
389 x86_push_membase (code, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
391 /* push the address of the register array */
392 x86_lea_membase (code, X86_EAX, X86_ESP, (pushed_args - 8) * sizeof (gpointer));
393 x86_push_reg (code, X86_EAX);
398 /* check the stack is aligned after the ret ip is pushed */
399 /*x86_mov_reg_reg (buf, X86_EDX, X86_ESP, 4);
400 x86_alu_reg_imm (buf, X86_AND, X86_EDX, 15);
401 x86_alu_reg_imm (buf, X86_CMP, X86_EDX, 0);
402 x86_branch_disp (buf, X86_CC_Z, 3, FALSE);
403 x86_breakpoint (buf);*/
406 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, X86_ESP, ((pushed_args + 2) * 4));
409 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
410 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
411 x86_call_reg (code, X86_EAX);
413 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
414 x86_call_code (code, tramp);
417 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4*4);
421 /* Check for thread interruption */
422 /* This is not perf critical code so no need to check the interrupt flag */
423 /* Align the stack on osx */
424 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 3 * 4);
425 x86_push_reg (code, X86_EAX);
427 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
428 x86_call_reg (code, X86_EAX);
430 x86_call_code (code, (guint8*)mono_thread_force_interruption_checkpoint);
432 x86_pop_reg (code, X86_EAX);
433 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 3 * 4);
437 /* ebx = previous_lmf */
438 x86_pop_reg (code, X86_EBX);
440 x86_alu_reg_imm (code, X86_SUB, X86_EBX, 1);
443 x86_pop_reg (code, X86_EDI);
446 /* *(lmf) = previous_lmf */
447 x86_mov_membase_reg (code, X86_EDI, 0, X86_EBX, 4);
449 /* discard method info */
450 x86_pop_reg (code, X86_ESI);
454 x86_pop_reg (code, X86_ESI);
457 /* restore caller saved regs */
458 x86_pop_reg (code, X86_EBX);
459 x86_pop_reg (code, X86_EDI);
460 x86_pop_reg (code, X86_ESI);
461 x86_pop_reg (code, X86_EBP);
465 /* discard save IP */
466 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4);
469 /* restore LMF end */
471 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
473 * Overwrite the method ptr with the address we need to jump to,
476 x86_mov_membase_reg (code, X86_ESP, pushed_args * sizeof (gpointer), X86_EAX, 4);
479 /* Restore caller saved registers */
480 x86_mov_reg_membase (code, X86_ECX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_ECX) * 4, 4);
481 x86_mov_reg_membase (code, X86_EDX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EDX) * 4, 4);
482 if ((tramp_type == MONO_TRAMPOLINE_RESTORE_STACK_PROT) || (tramp_type == MONO_TRAMPOLINE_AOT_PLT))
483 x86_mov_reg_membase (code, X86_EAX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EAX) * 4, 4);
485 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
486 /* Pop saved reg array + stack align */
487 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 9 * 4);
489 g_assert (pushed_args == 0);
491 /* Pop saved reg array + stack align + method ptr */
492 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 10 * 4);
495 /* We've popped one more stack item than we've pushed (the
496 method ptr argument), so we must end up at -1. */
497 g_assert (pushed_args == -1);
502 g_assert ((code - buf) <= 256);
505 *info = mono_tramp_info_create (mono_get_generic_trampoline_name (tramp_type), buf, code - buf, ji, unwind_ops);
507 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT) {
508 /* Initialize the nullified class init trampoline used in the AOT case */
509 nullified_class_init_trampoline = mono_arch_get_nullified_class_init_trampoline (NULL);
516 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
520 code = buf = mono_global_codeman_reserve (16);
523 mono_arch_flush_icache (buf, code - buf);
526 *info = mono_tramp_info_create (g_strdup_printf ("nullified_class_init_trampoline"), buf, code - buf, NULL, NULL);
528 if (mono_jit_map_is_enabled ())
529 mono_emit_jit_tramp (buf, code - buf, "nullified_class_init_trampoline");
534 #define TRAMPOLINE_SIZE 10
537 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
539 guint8 *code, *buf, *tramp;
541 tramp = mono_get_trampoline_code (tramp_type);
543 code = buf = mono_domain_code_reserve_align (domain, TRAMPOLINE_SIZE, NACL_SIZE (4, kNaClAlignment));
545 x86_push_imm (buf, arg1);
546 x86_jump_code (buf, tramp);
547 g_assert ((buf - code) <= TRAMPOLINE_SIZE);
549 mono_arch_flush_icache (code, buf - code);
552 *code_len = buf - code;
558 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
562 guint8 **rgctx_null_jumps;
567 MonoJumpInfo *ji = NULL;
568 GSList *unwind_ops = NULL;
570 unwind_ops = mono_arch_get_cie_program ();
572 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
573 index = MONO_RGCTX_SLOT_INDEX (slot);
575 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
576 for (depth = 0; ; ++depth) {
577 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
579 if (index < size - 1)
584 #ifdef __native_client_codegen__
585 /* TODO: align for Native Client */
586 tramp_size = (aot ? 64 : 36) + 2 * kNaClAlignment +
587 6 * (depth + kNaClAlignment);
589 tramp_size = (aot ? 64 : 36) + 6 * depth;
590 #endif /* __native_client_codegen__ */
592 code = buf = mono_global_codeman_reserve (tramp_size);
594 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
596 /* load vtable/mrgctx ptr */
597 x86_mov_reg_membase (code, X86_EAX, X86_ESP, 4, 4);
599 /* load rgctx ptr from vtable */
600 x86_mov_reg_membase (code, X86_EAX, X86_EAX, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context), 4);
601 /* is the rgctx ptr null? */
602 x86_test_reg_reg (code, X86_EAX, X86_EAX);
603 /* if yes, jump to actual trampoline */
604 rgctx_null_jumps [0] = code;
605 x86_branch8 (code, X86_CC_Z, -1, 1);
608 for (i = 0; i < depth; ++i) {
609 /* load ptr to next array */
610 if (mrgctx && i == 0)
611 x86_mov_reg_membase (code, X86_EAX, X86_EAX, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT, 4);
613 x86_mov_reg_membase (code, X86_EAX, X86_EAX, 0, 4);
614 /* is the ptr null? */
615 x86_test_reg_reg (code, X86_EAX, X86_EAX);
616 /* if yes, jump to actual trampoline */
617 rgctx_null_jumps [i + 1] = code;
618 x86_branch8 (code, X86_CC_Z, -1, 1);
622 x86_mov_reg_membase (code, X86_EAX, X86_EAX, sizeof (gpointer) * (index + 1), 4);
623 /* is the slot null? */
624 x86_test_reg_reg (code, X86_EAX, X86_EAX);
625 /* if yes, jump to actual trampoline */
626 rgctx_null_jumps [depth + 1] = code;
627 x86_branch8 (code, X86_CC_Z, -1, 1);
628 /* otherwise return */
631 for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
632 x86_patch (rgctx_null_jumps [i], code);
634 g_free (rgctx_null_jumps);
636 x86_mov_reg_membase (code, MONO_ARCH_VTABLE_REG, X86_ESP, 4, 4);
639 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
640 x86_jump_reg (code, X86_EAX);
642 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
644 /* jump to the actual trampoline */
645 x86_jump_code (code, tramp);
648 mono_arch_flush_icache (buf, code - buf);
650 g_assert (code - buf <= tramp_size);
653 *info = mono_tramp_info_create (mono_get_rgctx_fetch_trampoline_name (slot), buf, code - buf, ji, unwind_ops);
659 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
663 static int byte_offset = -1;
664 static guint8 bitmask;
667 GSList *unwind_ops = NULL;
668 MonoJumpInfo *ji = NULL;
672 code = buf = mono_global_codeman_reserve (tramp_size);
674 unwind_ops = mono_arch_get_cie_program ();
677 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
679 x86_test_membase_imm (code, MONO_ARCH_VTABLE_REG, byte_offset, bitmask);
681 x86_branch8 (code, X86_CC_Z, -1, 1);
685 x86_patch (jump, code);
687 /* Push the vtable so the stack is the same as in a specific trampoline */
688 x86_push_reg (code, MONO_ARCH_VTABLE_REG);
691 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_generic_class_init");
692 x86_jump_reg (code, X86_EAX);
694 tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
696 /* jump to the actual trampoline */
697 x86_jump_code (code, tramp);
700 mono_arch_flush_icache (code, code - buf);
702 g_assert (code - buf <= tramp_size);
703 #ifdef __native_client_codegen__
704 g_assert (code - buf <= kNaClAlignment);
707 *info = mono_tramp_info_create (g_strdup_printf ("generic_class_init_trampoline"), buf, code - buf, ji, unwind_ops);
712 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
714 * The code produced by this trampoline is equivalent to this:
717 * if (obj->synchronisation) {
718 * if (obj->synchronisation->owner == 0) {
719 * if (cmpxch (&obj->synchronisation->owner, TID, 0) == 0)
722 * if (obj->synchronisation->owner == TID) {
723 * ++obj->synchronisation->nest;
728 * return full_monitor_enter ();
732 mono_arch_create_monitor_enter_trampoline (MonoTrampInfo **info, gboolean aot)
734 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
736 guint8 *jump_obj_null, *jump_sync_null, *jump_other_owner, *jump_cmpxchg_failed, *jump_tid, *jump_sync_thin_hash = NULL;
738 int owner_offset, nest_offset, dummy;
739 MonoJumpInfo *ji = NULL;
740 GSList *unwind_ops = NULL;
742 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
744 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &dummy);
745 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
746 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
747 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
748 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
750 tramp_size = NACL_SIZE (64, 128);
752 code = buf = mono_global_codeman_reserve (tramp_size);
754 if (mono_thread_get_tls_offset () != -1) {
755 /* MonoObject* obj is in EAX */
757 x86_test_reg_reg (code, X86_EAX, X86_EAX);
758 /* if yes, jump to actual trampoline */
759 jump_obj_null = code;
760 x86_branch8 (code, X86_CC_Z, -1, 1);
762 /* load obj->synchronization to ECX */
763 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
765 if (mono_gc_is_moving ()) {
766 /*if bit zero is set it's a thin hash*/
767 /*FIXME use testb encoding*/
768 x86_test_reg_imm (code, X86_ECX, 0x01);
769 jump_sync_thin_hash = code;
770 x86_branch8 (code, X86_CC_NE, -1, 1);
772 /*clear bits used by the gc*/
773 x86_alu_reg_imm (code, X86_AND, X86_ECX, ~0x3);
776 /* is synchronization null? */
777 x86_test_reg_reg (code, X86_ECX, X86_ECX);
779 /* if yes, jump to actual trampoline */
780 jump_sync_null = code;
781 x86_branch8 (code, X86_CC_Z, -1, 1);
783 /* load MonoInternalThread* into EDX */
784 code = mono_x86_emit_tls_get (code, X86_EDX, mono_thread_get_tls_offset ());
785 /* load TID into EDX */
786 x86_mov_reg_membase (code, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 4);
788 /* is synchronization->owner null? */
789 x86_alu_membase_imm (code, X86_CMP, X86_ECX, owner_offset, 0);
790 /* if not, jump to next case */
792 x86_branch8 (code, X86_CC_NZ, -1, 1);
794 /* if yes, try a compare-exchange with the TID */
795 /* free up register EAX, needed for the zero */
796 x86_push_reg (code, X86_EAX);
798 x86_alu_reg_reg (code, X86_XOR, X86_EAX, X86_EAX);
799 /* compare and exchange */
800 x86_prefix (code, X86_LOCK_PREFIX);
801 x86_cmpxchg_membase_reg (code, X86_ECX, owner_offset, X86_EDX);
802 /* if not successful, jump to actual trampoline */
803 jump_cmpxchg_failed = code;
804 x86_branch8 (code, X86_CC_NZ, -1, 1);
805 /* if successful, pop and return */
806 x86_pop_reg (code, X86_EAX);
809 /* next case: synchronization->owner is not null */
810 x86_patch (jump_tid, code);
811 /* is synchronization->owner == TID? */
812 x86_alu_membase_reg (code, X86_CMP, X86_ECX, owner_offset, X86_EDX);
813 /* if not, jump to actual trampoline */
814 jump_other_owner = code;
815 x86_branch8 (code, X86_CC_NZ, -1, 1);
816 /* if yes, increment nest */
817 x86_inc_membase (code, X86_ECX, nest_offset);
822 x86_patch (jump_obj_null, code);
823 if (jump_sync_thin_hash)
824 x86_patch (jump_sync_thin_hash, code);
825 x86_patch (jump_sync_null, code);
826 x86_patch (jump_other_owner, code);
827 x86_push_reg (code, X86_EAX);
828 /* jump to the actual trampoline */
829 x86_patch (jump_cmpxchg_failed, code);
831 /* We are calling the generic trampoline directly, the argument is pushed
832 * on the stack just like a specific trampoline.
834 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_enter");
835 x86_jump_reg (code, X86_EAX);
837 x86_jump_code (code, tramp);
840 /* push obj and jump to the actual trampoline */
841 x86_push_reg (code, X86_EAX);
843 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_enter");
844 x86_jump_reg (code, X86_EAX);
846 x86_jump_code (code, tramp);
850 mono_arch_flush_icache (buf, code - buf);
851 g_assert (code - buf <= tramp_size);
854 *info = mono_tramp_info_create (g_strdup_printf ("monitor_enter_trampoline"), buf, code - buf, ji, unwind_ops);
860 mono_arch_create_monitor_exit_trampoline (MonoTrampInfo **info, gboolean aot)
862 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
864 guint8 *jump_obj_null, *jump_have_waiters, *jump_sync_null, *jump_not_owned, *jump_sync_thin_hash = NULL;
867 int owner_offset, nest_offset, entry_count_offset;
868 MonoJumpInfo *ji = NULL;
869 GSList *unwind_ops = NULL;
871 g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
873 mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &entry_count_offset);
874 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
875 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
876 g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (entry_count_offset) == sizeof (gint32));
877 owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
878 nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
879 entry_count_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (entry_count_offset);
881 tramp_size = NACL_SIZE (96, 128);
883 code = buf = mono_global_codeman_reserve (tramp_size);
885 if (mono_thread_get_tls_offset () != -1) {
886 /* MonoObject* obj is in EAX */
888 x86_test_reg_reg (code, X86_EAX, X86_EAX);
889 /* if yes, jump to actual trampoline */
890 jump_obj_null = code;
891 x86_branch8 (code, X86_CC_Z, -1, 1);
893 /* load obj->synchronization to ECX */
894 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
896 if (mono_gc_is_moving ()) {
897 /*if bit zero is set it's a thin hash*/
898 /*FIXME use testb encoding*/
899 x86_test_reg_imm (code, X86_ECX, 0x01);
900 jump_sync_thin_hash = code;
901 x86_branch8 (code, X86_CC_NE, -1, 1);
903 /*clear bits used by the gc*/
904 x86_alu_reg_imm (code, X86_AND, X86_ECX, ~0x3);
907 /* is synchronization null? */
908 x86_test_reg_reg (code, X86_ECX, X86_ECX);
909 /* if yes, jump to actual trampoline */
910 jump_sync_null = code;
911 x86_branch8 (code, X86_CC_Z, -1, 1);
913 /* next case: synchronization is not null */
914 /* load MonoInternalThread* into EDX */
915 code = mono_x86_emit_tls_get (code, X86_EDX, mono_thread_get_tls_offset ());
916 /* load TID into EDX */
917 x86_mov_reg_membase (code, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoInternalThread, tid), 4);
918 /* is synchronization->owner == TID */
919 x86_alu_membase_reg (code, X86_CMP, X86_ECX, owner_offset, X86_EDX);
920 /* if no, jump to actual trampoline */
921 jump_not_owned = code;
922 x86_branch8 (code, X86_CC_NZ, -1, 1);
924 /* next case: synchronization->owner == TID */
925 /* is synchronization->nest == 1 */
926 x86_alu_membase_imm (code, X86_CMP, X86_ECX, nest_offset, 1);
927 /* if not, jump to next case */
929 x86_branch8 (code, X86_CC_NZ, -1, 1);
930 /* if yes, is synchronization->entry_count zero? */
931 x86_alu_membase_imm (code, X86_CMP, X86_ECX, entry_count_offset, 0);
932 /* if not, jump to actual trampoline */
933 jump_have_waiters = code;
934 x86_branch8 (code, X86_CC_NZ, -1 , 1);
935 /* if yes, set synchronization->owner to null and return */
936 x86_mov_membase_imm (code, X86_ECX, owner_offset, 0, 4);
939 /* next case: synchronization->nest is not 1 */
940 x86_patch (jump_next, code);
941 /* decrease synchronization->nest and return */
942 x86_dec_membase (code, X86_ECX, nest_offset);
945 /* push obj and jump to the actual trampoline */
946 x86_patch (jump_obj_null, code);
947 if (jump_sync_thin_hash)
948 x86_patch (jump_sync_thin_hash, code);
949 x86_patch (jump_have_waiters, code);
950 x86_patch (jump_not_owned, code);
951 x86_patch (jump_sync_null, code);
954 /* push obj and jump to the actual trampoline */
955 x86_push_reg (code, X86_EAX);
957 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "generic_trampoline_monitor_exit");
958 x86_jump_reg (code, X86_EAX);
960 x86_jump_code (code, tramp);
963 mono_arch_flush_icache (buf, code - buf);
964 g_assert (code - buf <= tramp_size);
967 *info = mono_tramp_info_create (g_strdup_printf ("monitor_exit_trampoline"), buf, code - buf, ji, unwind_ops);
975 mono_arch_create_monitor_enter_trampoline (MonoTrampInfo **info, gboolean aot)
977 g_assert_not_reached ();
982 mono_arch_create_monitor_exit_trampoline (MonoTrampInfo **info, gboolean aot)
984 g_assert_not_reached ();
991 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
993 /* FIXME: This is not thread safe */
994 guint8 *code = ji->code_start;
996 x86_push_imm (code, func_arg);
997 x86_call_code (code, (guint8*)func);
1001 handler_block_trampoline_helper (gpointer *ptr)
1003 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1004 *ptr = jit_tls->handler_block_return_address;
1008 mono_arch_create_handler_block_trampoline (void)
1010 guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
1012 int tramp_size = 64;
1013 code = buf = mono_global_codeman_reserve (tramp_size);
1016 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
1019 if (mono_get_jit_tls_offset () != -1) {
1020 code = mono_x86_emit_tls_get (code, X86_EAX, mono_get_jit_tls_offset ());
1021 x86_mov_reg_membase (code, X86_EAX, X86_EAX, G_STRUCT_OFFSET (MonoJitTlsData, handler_block_return_address), 4);
1023 /*Fix stack alignment*/
1024 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 0x8);
1025 x86_push_reg (code, X86_EAX);
1026 x86_jump_code (code, tramp);
1028 /*Slow path uses a c helper*/
1029 x86_alu_reg_imm (code, X86_SUB, X86_ESP, 0x8);
1030 x86_push_reg (code, X86_ESP);
1031 x86_push_imm (code, tramp);
1032 x86_jump_code (code, handler_block_trampoline_helper);
1035 mono_arch_flush_icache (buf, code - buf);
1036 g_assert (code - buf <= tramp_size);
1038 if (mono_jit_map_is_enabled ())
1039 mono_emit_jit_tramp (buf, code - buf, "handler_block_trampoline");
1045 mono_arch_get_call_target (guint8 *code)
1047 if (code [-5] == 0xe8) {
1048 guint32 disp = *(guint32*)(code - 4);
1049 guint8 *target = code + disp;
1058 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1060 return *(guint32*)(plt_entry + NACL_SIZE (6, 12));