2 * exceptions-amd64.c: exception support for AMD64
5 * Dietmar Maurer (dietmar@ximian.com)
7 * (C) 2001 Ximian, Inc.
14 #ifdef HAVE_UCONTEXT_H
18 #include <mono/arch/amd64/amd64-codegen.h>
19 #include <mono/metadata/appdomain.h>
20 #include <mono/metadata/tabledefs.h>
21 #include <mono/metadata/threads.h>
22 #include <mono/metadata/threads-types.h>
23 #include <mono/metadata/debug-helpers.h>
24 #include <mono/metadata/exception.h>
25 #include <mono/metadata/gc-internal.h>
26 #include <mono/metadata/mono-debug.h>
27 #include <mono/utils/mono-mmap.h>
30 #include "mini-amd64.h"
32 #include "debug-mini.h"
34 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
37 static MonoW32ExceptionHandler fpe_handler;
38 static MonoW32ExceptionHandler ill_handler;
39 static MonoW32ExceptionHandler segv_handler;
41 static LPTOP_LEVEL_EXCEPTION_FILTER old_handler;
43 #define W32_SEH_HANDLE_EX(_ex) \
44 if (_ex##_handler) _ex##_handler(0, er, sctx)
47 * Unhandled Exception Filter
48 * Top-level per-process exception handler.
50 LONG CALLBACK seh_handler(EXCEPTION_POINTERS* ep)
57 res = EXCEPTION_CONTINUE_EXECUTION;
59 er = ep->ExceptionRecord;
60 ctx = ep->ContextRecord;
61 sctx = g_malloc(sizeof(MonoContext));
63 /* Copy Win32 context to UNIX style context */
78 switch (er->ExceptionCode) {
79 case EXCEPTION_ACCESS_VIOLATION:
80 W32_SEH_HANDLE_EX(segv);
82 case EXCEPTION_ILLEGAL_INSTRUCTION:
83 W32_SEH_HANDLE_EX(ill);
85 case EXCEPTION_INT_DIVIDE_BY_ZERO:
86 case EXCEPTION_INT_OVERFLOW:
87 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
88 case EXCEPTION_FLT_OVERFLOW:
89 case EXCEPTION_FLT_UNDERFLOW:
90 case EXCEPTION_FLT_INEXACT_RESULT:
91 W32_SEH_HANDLE_EX(fpe);
97 /* Copy context back */
100 ctx->Rdi = sctx->rdi;
101 ctx->Rsi = sctx->rsi;
102 ctx->Rbx = sctx->rbx;
103 ctx->Rbp = sctx->rbp;
104 ctx->R12 = sctx->r12;
105 ctx->R13 = sctx->r13;
106 ctx->R14 = sctx->r14;
107 ctx->R15 = sctx->r15;
108 ctx->Rip = sctx->rip;
110 /* Volatile But should not matter?*/
111 ctx->Rax = sctx->rax;
112 ctx->Rcx = sctx->rcx;
113 ctx->Rdx = sctx->rdx;
120 void win32_seh_init()
122 old_handler = SetUnhandledExceptionFilter(seh_handler);
125 void win32_seh_cleanup()
127 if (old_handler) SetUnhandledExceptionFilter(old_handler);
130 void win32_seh_set_handler(int type, MonoW32ExceptionHandler handler)
134 fpe_handler = handler;
137 ill_handler = handler;
140 segv_handler = handler;
147 #endif /* TARGET_WIN32 */
150 * mono_arch_get_restore_context:
152 * Returns a pointer to a method which restores a previously saved sigcontext.
155 mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
157 guint8 *start = NULL;
159 MonoJumpInfo *ji = NULL;
160 GSList *unwind_ops = NULL;
162 /* restore_contect (MonoContext *ctx) */
164 start = code = mono_global_codeman_reserve (256);
166 amd64_mov_reg_reg (code, AMD64_R11, AMD64_ARG_REG1, 8);
168 /* Restore all registers except %rip and %r11 */
169 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rax), 8);
170 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rcx), 8);
171 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdx), 8);
172 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbx), 8);
173 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbp), 8);
174 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsi), 8);
175 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdi), 8);
176 //amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r8), 8);
177 //amd64_mov_reg_membase (code, AMD64_R9, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r9), 8);
178 //amd64_mov_reg_membase (code, AMD64_R10, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r10), 8);
179 amd64_mov_reg_membase (code, AMD64_R12, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r12), 8);
180 amd64_mov_reg_membase (code, AMD64_R13, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r13), 8);
181 amd64_mov_reg_membase (code, AMD64_R14, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r14), 8);
182 amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r15), 8);
184 if (mono_running_on_valgrind ()) {
185 /* Prevent 'Address 0x... is just below the stack ptr.' errors */
186 amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
187 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
188 amd64_mov_reg_reg (code, AMD64_RSP, AMD64_R8, 8);
190 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
191 /* get return address */
192 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
195 /* jump to the saved IP */
196 amd64_jump_reg (code, AMD64_R11);
198 mono_arch_flush_icache (start, code - start);
201 *info = mono_tramp_info_create (g_strdup_printf ("restore_context"), start, code - start, ji, unwind_ops);
207 * mono_arch_get_call_filter:
209 * Returns a pointer to a method which calls an exception filter. We
210 * also use this function to call finally handlers (we pass NULL as
211 * @exc object in this case).
214 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
220 MonoJumpInfo *ji = NULL;
221 GSList *unwind_ops = NULL;
223 start = code = mono_global_codeman_reserve (128);
225 /* call_filter (MonoContext *ctx, unsigned long eip) */
228 /* Alloc new frame */
229 amd64_push_reg (code, AMD64_RBP);
230 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
232 /* Save callee saved regs */
234 for (i = 0; i < AMD64_NREG; ++i)
235 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
236 amd64_push_reg (code, i);
242 amd64_push_reg (code, AMD64_RBP);
244 /* Make stack misaligned, the call will make it aligned again */
246 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
249 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbp), 8);
250 /* load callee saved regs */
251 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbx), 8);
252 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r12), 8);
253 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r13), 8);
254 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r14), 8);
255 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r15), 8);
257 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rdi), 8);
258 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rsi), 8);
261 /* call the handler */
262 amd64_call_reg (code, AMD64_ARG_REG2);
265 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
268 amd64_pop_reg (code, AMD64_RBP);
270 /* Restore callee saved regs */
271 for (i = AMD64_NREG; i >= 0; --i)
272 if (AMD64_IS_CALLEE_SAVED_REG (i))
273 amd64_pop_reg (code, i);
278 g_assert ((code - start) < 128);
280 mono_arch_flush_icache (start, code - start);
283 *info = mono_tramp_info_create (g_strdup_printf ("call_filter"), start, code - start, ji, unwind_ops);
289 * The first few arguments are dummy, to force the other arguments to be passed on
290 * the stack, this avoids overwriting the argument registers in the throw trampoline.
293 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
294 guint64 dummy5, guint64 dummy6,
295 MonoObject *exc, guint64 rip, guint64 rsp,
296 guint64 rbx, guint64 rbp, guint64 r12, guint64 r13,
297 guint64 r14, guint64 r15, guint64 rdi, guint64 rsi,
298 guint64 rax, guint64 rcx, guint64 rdx,
301 static void (*restore_context) (MonoContext *);
304 if (!restore_context)
305 restore_context = mono_get_restore_context ();
321 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
322 MonoException *mono_ex = (MonoException*)exc;
324 mono_ex->stack_trace = NULL;
327 if (mono_debug_using_mono_debugger ()) {
328 guint8 buf [16], *code;
330 mono_breakpoint_clean_code (NULL, (gpointer)rip, 8, buf, sizeof (buf));
333 if (buf [3] == 0xe8) {
334 MonoContext ctx_cp = ctx;
335 ctx_cp.rip = rip - 5;
337 if (mono_debugger_handle_exception (&ctx_cp, exc)) {
338 restore_context (&ctx_cp);
339 g_assert_not_reached ();
344 /* adjust eip so that it point into the call instruction */
347 mono_handle_exception (&ctx, exc, (gpointer)rip, FALSE);
348 restore_context (&ctx);
350 g_assert_not_reached ();
354 mono_amd64_throw_corlib_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
355 guint64 dummy5, guint64 dummy6,
356 guint32 ex_token_index,
357 guint64 rip, guint64 rsp,
358 guint64 rbx, guint64 rbp, guint64 r12, guint64 r13,
359 guint64 r14, guint64 r15, guint64 rdi, guint64 rsi,
360 guint64 rax, guint64 rcx, guint64 rdx,
363 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
366 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
370 mono_amd64_throw_exception (dummy1, dummy2, dummy3, dummy4, dummy5, dummy6, (MonoObject*)ex, rip, rsp, rbx, rbp, r12, r13, r14, r15, rdi, rsi, rax, rcx, rdx, FALSE);
374 * get_throw_trampoline:
376 * Generate a call to mono_amd64_throw_exception/
377 * mono_amd64_throw_corlib_exception.
380 get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean aot)
384 MonoJumpInfo *ji = NULL;
385 GSList *unwind_ops = NULL;
387 start = code = mono_global_codeman_reserve (64);
391 unwind_ops = mono_arch_get_cie_program ();
393 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RSP, 8);
397 amd64_push_reg (code, AMD64_ARG_REG2);
399 amd64_push_imm (code, rethrow);
400 amd64_push_reg (code, AMD64_RDX);
401 amd64_push_reg (code, AMD64_RCX);
402 amd64_push_reg (code, AMD64_RAX);
403 amd64_push_reg (code, AMD64_RSI);
404 amd64_push_reg (code, AMD64_RDI);
405 amd64_push_reg (code, AMD64_R15);
406 amd64_push_reg (code, AMD64_R14);
407 amd64_push_reg (code, AMD64_R13);
408 amd64_push_reg (code, AMD64_R12);
409 amd64_push_reg (code, AMD64_RBP);
410 amd64_push_reg (code, AMD64_RBX);
413 amd64_lea_membase (code, AMD64_RAX, AMD64_R11, 8);
414 amd64_push_reg (code, AMD64_RAX);
417 amd64_push_membase (code, AMD64_R11, 0);
421 amd64_push_reg (code, AMD64_ARG_REG1);
424 amd64_push_reg (code, AMD64_ARG_REG1);
426 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, (15 + 1) * sizeof (gpointer));
430 amd64_push_imm (code, 0);
431 amd64_push_imm (code, 0);
432 amd64_push_imm (code, 0);
433 amd64_push_imm (code, 0);
434 amd64_push_imm (code, 0);
435 amd64_push_imm (code, 0);
439 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, corlib ? "mono_amd64_throw_corlib_exception" : "mono_amd64_throw_exception");
440 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
442 amd64_mov_reg_imm (code, AMD64_R11, corlib ? (gpointer)mono_amd64_throw_corlib_exception : (gpointer)mono_amd64_throw_exception);
444 amd64_call_reg (code, AMD64_R11);
445 amd64_breakpoint (code);
447 mono_arch_flush_icache (start, code - start);
449 g_assert ((code - start) < 64);
451 mono_save_trampoline_xdebug_info ("throw_exception_trampoline", start, code - start, unwind_ops);
454 *info = mono_tramp_info_create (g_strdup_printf (corlib ? "throw_corlib_exception" : (rethrow ? "rethrow_exception" : "throw_exception")), start, code - start, ji, unwind_ops);
460 * mono_arch_get_throw_exception:
462 * Returns a function pointer which can be used to raise
463 * exceptions. The returned function has the following
464 * signature: void (*func) (MonoException *exc);
468 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
470 return get_throw_trampoline (info, FALSE, FALSE, aot);
474 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
476 return get_throw_trampoline (info, TRUE, FALSE, aot);
480 * mono_arch_get_throw_corlib_exception:
482 * Returns a function pointer which can be used to raise
483 * corlib exceptions. The returned function has the following
484 * signature: void (*func) (guint32 ex_token, guint32 offset);
485 * Here, offset is the offset which needs to be substracted from the caller IP
486 * to get the IP of the throw. Passing the offset has the advantage that it
487 * needs no relocations in the caller.
490 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
492 return get_throw_trampoline (info, FALSE, TRUE, aot);
496 * mono_arch_find_jit_info_ext:
498 * This function is used to gather information from @ctx, and store it in @frame_info.
499 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
500 * is modified if needed.
501 * Returns TRUE on success, FALSE otherwise.
502 * This function is a version of mono_arch_find_jit_info () where all the results are
503 * returned in a StackFrameInfo structure.
506 mono_arch_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
507 MonoJitInfo *ji, MonoContext *ctx,
508 MonoContext *new_ctx, MonoLMF **lmf,
509 StackFrameInfo *frame)
511 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
513 memset (frame, 0, sizeof (StackFrameInfo));
515 frame->managed = FALSE;
520 gssize regs [MONO_MAX_IREGS + 1];
522 guint32 unwind_info_len;
525 frame->type = FRAME_TYPE_MANAGED;
527 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
528 frame->managed = TRUE;
531 unwind_info = mono_aot_get_unwind_info (ji, &unwind_info_len);
533 unwind_info = mono_get_cached_unwind_info (ji->used_regs, &unwind_info_len);
535 regs [AMD64_RAX] = new_ctx->rax;
536 regs [AMD64_RBX] = new_ctx->rbx;
537 regs [AMD64_RCX] = new_ctx->rcx;
538 regs [AMD64_RDX] = new_ctx->rdx;
539 regs [AMD64_RBP] = new_ctx->rbp;
540 regs [AMD64_RSP] = new_ctx->rsp;
541 regs [AMD64_RSI] = new_ctx->rsi;
542 regs [AMD64_RDI] = new_ctx->rdi;
543 regs [AMD64_RIP] = new_ctx->rip;
544 regs [AMD64_R12] = new_ctx->r12;
545 regs [AMD64_R13] = new_ctx->r13;
546 regs [AMD64_R14] = new_ctx->r14;
547 regs [AMD64_R15] = new_ctx->r15;
549 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
550 (guint8*)ji->code_start + ji->code_size,
551 ip, regs, MONO_MAX_IREGS + 1, &cfa);
553 new_ctx->rax = regs [AMD64_RAX];
554 new_ctx->rbx = regs [AMD64_RBX];
555 new_ctx->rcx = regs [AMD64_RCX];
556 new_ctx->rdx = regs [AMD64_RDX];
557 new_ctx->rbp = regs [AMD64_RBP];
558 new_ctx->rsp = regs [AMD64_RSP];
559 new_ctx->rsi = regs [AMD64_RSI];
560 new_ctx->rdi = regs [AMD64_RDI];
561 new_ctx->rip = regs [AMD64_RIP];
562 new_ctx->r12 = regs [AMD64_R12];
563 new_ctx->r13 = regs [AMD64_R13];
564 new_ctx->r14 = regs [AMD64_R14];
565 new_ctx->r15 = regs [AMD64_R15];
567 /* The CFA becomes the new SP value */
568 new_ctx->rsp = (gssize)cfa;
573 if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
574 /* remove any unused lmf */
575 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
578 #ifndef MONO_AMD64_NO_PUSHES
579 /* Pop arguments off the stack */
581 MonoJitArgumentInfo *arg_info = g_newa (MonoJitArgumentInfo, mono_method_signature (ji->method)->param_count + 1);
583 guint32 stack_to_pop = mono_arch_get_argument_info (mono_method_signature (ji->method), mono_method_signature (ji->method)->param_count, arg_info);
584 new_ctx->rsp += stack_to_pop;
592 if (((guint64)(*lmf)->previous_lmf) & 2) {
594 * This LMF entry is created by the soft debug code to mark transitions to
595 * managed code done during invokes.
597 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
599 g_assert (ext->debugger_invoke);
601 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
603 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
605 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
610 if (((guint64)(*lmf)->previous_lmf) & 1) {
611 /* This LMF has the rip field set */
613 } else if ((*lmf)->rsp == 0) {
618 * The rsp field is set just before the call which transitioned to native
619 * code. Obtain the rip from the stack.
621 rip = *(guint64*)((*lmf)->rsp - sizeof (gpointer));
624 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
626 // FIXME: This can happen with multiple appdomains (bug #444383)
631 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
634 new_ctx->rbp = (*lmf)->rbp;
635 new_ctx->rsp = (*lmf)->rsp;
637 new_ctx->rbx = (*lmf)->rbx;
638 new_ctx->r12 = (*lmf)->r12;
639 new_ctx->r13 = (*lmf)->r13;
640 new_ctx->r14 = (*lmf)->r14;
641 new_ctx->r15 = (*lmf)->r15;
643 new_ctx->rdi = (*lmf)->rdi;
644 new_ctx->rsi = (*lmf)->rsi;
647 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
658 * Called by resuming from a signal handler.
661 handle_signal_exception (gpointer obj, gboolean test_only)
663 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
665 static void (*restore_context) (MonoContext *);
667 if (!restore_context)
668 restore_context = mono_get_restore_context ();
670 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
672 if (mono_debugger_handle_exception (&ctx, (MonoObject *)obj))
675 mono_handle_exception (&ctx, obj, MONO_CONTEXT_GET_IP (&ctx), test_only);
677 restore_context (&ctx);
681 * mono_arch_handle_exception:
683 * @ctx: saved processor state
684 * @obj: the exception object
687 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
689 #if defined(MONO_ARCH_USE_SIGACTION) && defined(UCONTEXT_GREGS)
691 * Handling the exception in the signal handler is problematic, since the original
692 * signal is disabled, and we could run arbitrary code though the debugger. So
693 * resume into the normal stack and do most work there if possible.
695 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
696 guint64 sp = UCONTEXT_REG_RSP (sigctx);
698 /* Pass the ctx parameter in TLS */
699 mono_arch_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
700 /* The others in registers */
701 UCONTEXT_REG_RDI (sigctx) = (guint64)obj;
702 UCONTEXT_REG_RSI (sigctx) = test_only;
704 /* Allocate a stack frame below the red zone */
706 /* The stack should be unaligned */
709 UCONTEXT_REG_RSP (sigctx) = sp;
711 UCONTEXT_REG_RIP (sigctx) = (guint64)handle_signal_exception;
717 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
719 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj))
722 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), test_only);
724 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
730 #if defined(MONO_ARCH_USE_SIGACTION) && defined(UCONTEXT_GREGS)
731 static inline guint64*
732 gregs_from_ucontext (ucontext_t *ctx)
734 return (guint64 *) UCONTEXT_GREGS (ctx);
738 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
740 #if defined(MONO_ARCH_USE_SIGACTION)
741 ucontext_t *ctx = (ucontext_t*)sigctx;
743 mctx->rax = UCONTEXT_REG_RAX (ctx);
744 mctx->rbx = UCONTEXT_REG_RBX (ctx);
745 mctx->rcx = UCONTEXT_REG_RCX (ctx);
746 mctx->rdx = UCONTEXT_REG_RDX (ctx);
747 mctx->rbp = UCONTEXT_REG_RBP (ctx);
748 mctx->rsp = UCONTEXT_REG_RSP (ctx);
749 mctx->rsi = UCONTEXT_REG_RSI (ctx);
750 mctx->rdi = UCONTEXT_REG_RDI (ctx);
751 mctx->rip = UCONTEXT_REG_RIP (ctx);
752 mctx->r12 = UCONTEXT_REG_R12 (ctx);
753 mctx->r13 = UCONTEXT_REG_R13 (ctx);
754 mctx->r14 = UCONTEXT_REG_R14 (ctx);
755 mctx->r15 = UCONTEXT_REG_R15 (ctx);
757 MonoContext *ctx = (MonoContext *)sigctx;
759 mctx->rax = ctx->rax;
760 mctx->rbx = ctx->rbx;
761 mctx->rcx = ctx->rcx;
762 mctx->rdx = ctx->rdx;
763 mctx->rbp = ctx->rbp;
764 mctx->rsp = ctx->rsp;
765 mctx->rsi = ctx->rsi;
766 mctx->rdi = ctx->rdi;
767 mctx->rip = ctx->rip;
768 mctx->r12 = ctx->r12;
769 mctx->r13 = ctx->r13;
770 mctx->r14 = ctx->r14;
771 mctx->r15 = ctx->r15;
776 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
778 #if defined(MONO_ARCH_USE_SIGACTION)
779 ucontext_t *ctx = (ucontext_t*)sigctx;
781 UCONTEXT_REG_RAX (ctx) = mctx->rax;
782 UCONTEXT_REG_RBX (ctx) = mctx->rbx;
783 UCONTEXT_REG_RCX (ctx) = mctx->rcx;
784 UCONTEXT_REG_RDX (ctx) = mctx->rdx;
785 UCONTEXT_REG_RBP (ctx) = mctx->rbp;
786 UCONTEXT_REG_RSP (ctx) = mctx->rsp;
787 UCONTEXT_REG_RSI (ctx) = mctx->rsi;
788 UCONTEXT_REG_RDI (ctx) = mctx->rdi;
789 UCONTEXT_REG_RIP (ctx) = mctx->rip;
790 UCONTEXT_REG_R12 (ctx) = mctx->r12;
791 UCONTEXT_REG_R13 (ctx) = mctx->r13;
792 UCONTEXT_REG_R14 (ctx) = mctx->r14;
793 UCONTEXT_REG_R15 (ctx) = mctx->r15;
795 MonoContext *ctx = (MonoContext *)sigctx;
797 ctx->rax = mctx->rax;
798 ctx->rbx = mctx->rbx;
799 ctx->rcx = mctx->rcx;
800 ctx->rdx = mctx->rdx;
801 ctx->rbp = mctx->rbp;
802 ctx->rsp = mctx->rsp;
803 ctx->rsi = mctx->rsi;
804 ctx->rdi = mctx->rdi;
805 ctx->rip = mctx->rip;
806 ctx->r12 = mctx->r12;
807 ctx->r13 = mctx->r13;
808 ctx->r14 = mctx->r14;
809 ctx->r15 = mctx->r15;
814 mono_arch_ip_from_context (void *sigctx)
816 #if defined(MONO_ARCH_USE_SIGACTION)
817 ucontext_t *ctx = (ucontext_t*)sigctx;
819 return (gpointer)UCONTEXT_REG_RIP (ctx);
821 MonoContext *ctx = sigctx;
822 return (gpointer)ctx->rip;
827 restore_soft_guard_pages (void)
829 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
830 if (jit_tls->stack_ovf_guard_base)
831 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
835 * this function modifies mctx so that when it is restored, it
836 * won't execcute starting at mctx.eip, but in a function that
837 * will restore the protection on the soft-guard pages and return back to
838 * continue at mctx.eip.
841 prepare_for_guard_pages (MonoContext *mctx)
844 sp = (gpointer)(mctx->rsp);
846 /* the return addr */
847 sp [0] = (gpointer)(mctx->rip);
848 mctx->rip = (guint64)restore_soft_guard_pages;
849 mctx->rsp = (guint64)sp;
853 altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean stack_ovf)
855 void (*restore_context) (MonoContext *);
858 restore_context = mono_get_restore_context ();
859 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
861 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
863 prepare_for_guard_pages (&mctx);
864 restore_context (&mctx);
867 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), FALSE);
869 prepare_for_guard_pages (&mctx);
870 restore_context (&mctx);
874 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
876 #if defined(MONO_ARCH_USE_SIGACTION) && defined(UCONTEXT_GREGS)
877 MonoException *exc = NULL;
878 ucontext_t *ctx = (ucontext_t*)sigctx;
879 guint64 *gregs = gregs_from_ucontext (ctx);
880 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)gregs [REG_RIP], NULL);
885 exc = mono_domain_get ()->stack_overflow_ex;
887 mono_handle_native_sigsegv (SIGSEGV, sigctx);
889 /* setup a call frame on the real stack so that control is returned there
890 * and exception handling can continue.
891 * The frame looks like:
895 * 128 is the size of the red zone
897 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4 + 128;
900 sp = (gpointer)(gregs [REG_RSP] & ~15);
901 sp = (gpointer)((char*)sp - frame_size);
902 /* the arguments must be aligned */
903 sp [-1] = (gpointer)gregs [REG_RIP];
904 /* may need to adjust pointers in the new struct copy, depending on the OS */
905 memcpy (sp + 4, ctx, sizeof (ucontext_t));
906 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
907 gregs [REG_RIP] = (unsigned long)altstack_handle_and_restore;
908 gregs [REG_RSP] = (unsigned long)(sp - 1);
909 gregs [REG_RDI] = (unsigned long)(sp + 4);
910 gregs [REG_RSI] = (guint64)exc;
911 gregs [REG_RDX] = stack_ovf;
916 mono_amd64_get_original_ip (void)
918 MonoLMF *lmf = mono_get_lmf ();
922 /* Reset the change to previous_lmf */
923 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
929 mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
931 guint8 *code, *start;
933 gpointer throw_trampoline;
934 MonoJumpInfo *ji = NULL;
935 GSList *unwind_ops = NULL;
937 start = code = mono_global_codeman_reserve (128);
939 /* We are in the frame of a managed method after a call */
941 * We would like to throw the pending exception in such a way that it looks to
942 * be thrown from the managed method.
945 /* Save registers which might contain the return value of the call */
946 amd64_push_reg (code, AMD64_RAX);
947 amd64_push_reg (code, AMD64_RDX);
949 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
950 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
953 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
955 /* Obtain the pending exception */
957 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
958 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
960 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
962 amd64_call_reg (code, AMD64_R11);
964 /* Check if it is NULL, and branch */
965 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
966 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
968 /* exc != NULL branch */
970 /* Save the exc on the stack */
971 amd64_push_reg (code, AMD64_RAX);
973 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
975 /* Obtain the original ip and clear the flag in previous_lmf */
977 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
978 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
980 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
982 amd64_call_reg (code, AMD64_R11);
985 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
987 /* Pop saved stuff from the stack */
988 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
990 /* Setup arguments for the throw trampoline */
992 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
993 /* The trampoline expects the caller ip to be pushed on the stack */
994 amd64_push_reg (code, AMD64_RAX);
996 /* Call the throw trampoline */
998 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
999 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1001 throw_trampoline = mono_get_throw_exception ();
1002 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
1004 /* We use a jump instead of a call so we can push the original ip on the stack */
1005 amd64_jump_reg (code, AMD64_R11);
1007 /* ex == NULL branch */
1008 mono_amd64_patch (br [0], code);
1010 /* Obtain the original ip and clear the flag in previous_lmf */
1012 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1013 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1015 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1017 amd64_call_reg (code, AMD64_R11);
1018 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
1020 /* Restore registers */
1021 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1022 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
1023 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1024 amd64_pop_reg (code, AMD64_RDX);
1025 amd64_pop_reg (code, AMD64_RAX);
1027 /* Return to original code */
1028 amd64_jump_reg (code, AMD64_R11);
1030 g_assert ((code - start) < 128);
1033 *info = mono_tramp_info_create (g_strdup_printf ("throw_pending_exception"), start, code - start, ji, unwind_ops);
1038 static gpointer throw_pending_exception;
1041 * Called when a thread receives an async exception while executing unmanaged code.
1042 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1043 * the return address on the stack to point to a helper routine which throws the
1047 mono_arch_notify_pending_exc (void)
1049 MonoLMF *lmf = mono_get_lmf ();
1052 /* Not yet started */
1059 if ((guint64)lmf->previous_lmf & 1)
1060 /* Already hijacked or trampoline LMF entry */
1063 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1064 lmf->rip = *(guint64*)(lmf->rsp - 8);
1065 /* Signal that lmf->rip is set */
1066 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1068 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1072 mono_arch_exceptions_init (void)
1074 if (mono_aot_only) {
1075 throw_pending_exception = mono_aot_get_trampoline ("throw_pending_exception");
1077 /* Call this to avoid initialization races */
1078 throw_pending_exception = mono_arch_get_throw_pending_exception (NULL, FALSE);
1085 * The mono_arch_unwindinfo* methods are used to build and add
1086 * function table info for each emitted method from mono. On Winx64
1087 * the seh handler will not be called if the mono methods are not
1088 * added to the function table.
1090 * We should not need to add non-volatile register info to the
1091 * table since mono stores that info elsewhere. (Except for the register
1095 #define MONO_MAX_UNWIND_CODES 22
1097 typedef union _UNWIND_CODE {
1100 guchar UnwindOp : 4;
1103 gushort FrameOffset;
1104 } UNWIND_CODE, *PUNWIND_CODE;
1106 typedef struct _UNWIND_INFO {
1109 guchar SizeOfProlog;
1110 guchar CountOfCodes;
1111 guchar FrameRegister : 4;
1112 guchar FrameOffset : 4;
1113 /* custom size for mono allowing for mono allowing for*/
1114 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1115 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1116 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1117 /*UWOP_PUSH_NONVOL offset = 15-0*/
1118 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1120 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1122 * OPTIONAL ULONG ExceptionHandler;
1123 * OPTIONAL ULONG FunctionEntry;
1125 * OPTIONAL ULONG ExceptionData[]; */
1126 } UNWIND_INFO, *PUNWIND_INFO;
1130 RUNTIME_FUNCTION runtimeFunction;
1131 UNWIND_INFO unwindInfo;
1132 } MonoUnwindInfo, *PMonoUnwindInfo;
1135 mono_arch_unwindinfo_create (gpointer* monoui)
1137 PMonoUnwindInfo newunwindinfo;
1138 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1139 newunwindinfo->unwindInfo.Version = 1;
1143 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1145 PMonoUnwindInfo unwindinfo;
1146 PUNWIND_CODE unwindcode;
1149 mono_arch_unwindinfo_create (monoui);
1151 unwindinfo = (MonoUnwindInfo*)*monoui;
1153 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1154 g_error ("Larger allocation needed for the unwind information.");
1156 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1157 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1158 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1159 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1160 unwindcode->OpInfo = reg;
1162 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1163 g_error ("Adding unwind info in wrong order.");
1165 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1169 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1171 PMonoUnwindInfo unwindinfo;
1172 PUNWIND_CODE unwindcode;
1175 mono_arch_unwindinfo_create (monoui);
1177 unwindinfo = (MonoUnwindInfo*)*monoui;
1179 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1180 g_error ("Larger allocation needed for the unwind information.");
1182 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1183 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1184 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1186 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1187 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1188 unwindcode->OpInfo = reg;
1190 unwindinfo->unwindInfo.FrameRegister = reg;
1192 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1193 g_error ("Adding unwind info in wrong order.");
1195 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1199 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1201 PMonoUnwindInfo unwindinfo;
1202 PUNWIND_CODE unwindcode;
1206 mono_arch_unwindinfo_create (monoui);
1208 unwindinfo = (MonoUnwindInfo*)*monoui;
1211 g_error ("Stack allocation must be equal to or greater than 0x8.");
1215 else if (size <= 0x7FFF8)
1220 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1221 g_error ("Larger allocation needed for the unwind information.");
1223 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1224 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1226 if (codesneeded == 1) {
1227 /*The size of the allocation is
1228 (the number in the OpInfo member) times 8 plus 8*/
1229 unwindcode->OpInfo = (size - 8)/8;
1230 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1233 if (codesneeded == 3) {
1234 /*the unscaled size of the allocation is recorded
1235 in the next two slots in little-endian format*/
1236 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1238 unwindcode->OpInfo = 1;
1241 /*the size of the allocation divided by 8
1242 is recorded in the next slot*/
1243 unwindcode->FrameOffset = size/8;
1245 unwindcode->OpInfo = 0;
1248 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1251 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1253 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1254 g_error ("Adding unwind info in wrong order.");
1256 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1260 mono_arch_unwindinfo_get_size (gpointer monoui)
1262 PMonoUnwindInfo unwindinfo;
1266 unwindinfo = (MonoUnwindInfo*)monoui;
1267 return (8 + sizeof (MonoUnwindInfo)) -
1268 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1272 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1276 PMonoUnwindInfo targetinfo;
1277 MonoDomain *domain = mono_domain_get ();
1279 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1283 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1285 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1287 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1289 return &targetinfo->runtimeFunction;
1293 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1295 PMonoUnwindInfo unwindinfo, targetinfo;
1297 guint64 targetlocation;
1301 unwindinfo = (MonoUnwindInfo*)*monoui;
1302 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1303 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1305 unwindinfo->runtimeFunction.EndAddress = code_size;
1306 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1308 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1310 codecount = unwindinfo->unwindInfo.CountOfCodes;
1312 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1313 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1316 g_free (unwindinfo);
1319 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1324 #if MONO_SUPPORT_TASKLETS
1325 MonoContinuationRestore
1326 mono_tasklets_arch_restore (void)
1328 static guint8* saved = NULL;
1329 guint8 *code, *start;
1330 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1333 return (MonoContinuationRestore)saved;
1334 code = start = mono_global_codeman_reserve (64);
1335 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1336 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1337 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1338 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1339 * We move cont to cont_reg since we need both rcx and rdi for the copy
1340 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1342 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1343 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1344 /* setup the copy of the stack */
1345 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1346 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1348 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1349 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1350 amd64_prefix (code, X86_REP_PREFIX);
1353 /* now restore the registers from the LMF */
1354 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1355 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1356 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1357 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1358 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1359 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1360 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1362 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1363 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1365 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1367 /* restore the lmf chain */
1368 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1369 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1371 /* state is already in rax */
1372 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1373 g_assert ((code - start) <= 64);
1375 return (MonoContinuationRestore)saved;