2 * exceptions-amd64.c: exception support for AMD64
5 * Dietmar Maurer (dietmar@ximian.com)
7 * (C) 2001 Ximian, Inc.
8 * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
19 #ifdef HAVE_UCONTEXT_H
23 #include <mono/arch/amd64/amd64-codegen.h>
24 #include <mono/metadata/abi-details.h>
25 #include <mono/metadata/appdomain.h>
26 #include <mono/metadata/tabledefs.h>
27 #include <mono/metadata/threads.h>
28 #include <mono/metadata/threads-types.h>
29 #include <mono/metadata/debug-helpers.h>
30 #include <mono/metadata/exception.h>
31 #include <mono/metadata/gc-internals.h>
32 #include <mono/metadata/mono-debug.h>
33 #include <mono/utils/mono-mmap.h>
36 #include "mini-amd64.h"
39 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
42 static MonoW32ExceptionHandler fpe_handler;
43 static MonoW32ExceptionHandler ill_handler;
44 static MonoW32ExceptionHandler segv_handler;
46 LPTOP_LEVEL_EXCEPTION_FILTER mono_old_win_toplevel_exception_filter;
47 void *mono_win_vectored_exception_handle;
49 #define W32_SEH_HANDLE_EX(_ex) \
50 if (_ex##_handler) _ex##_handler(0, ep, ctx)
52 static LONG CALLBACK seh_unhandled_exception_filter(EXCEPTION_POINTERS* ep)
54 #ifndef MONO_CROSS_COMPILE
55 if (mono_old_win_toplevel_exception_filter) {
56 return (*mono_old_win_toplevel_exception_filter)(ep);
60 mono_handle_native_sigsegv (SIGSEGV, NULL, NULL);
62 return EXCEPTION_CONTINUE_SEARCH;
66 * Unhandled Exception Filter
67 * Top-level per-process exception handler.
69 static LONG CALLBACK seh_vectored_exception_handler(EXCEPTION_POINTERS* ep)
74 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
76 /* If the thread is not managed by the runtime return early */
78 return EXCEPTION_CONTINUE_SEARCH;
80 jit_tls->mono_win_chained_exception_needs_run = FALSE;
81 res = EXCEPTION_CONTINUE_EXECUTION;
83 er = ep->ExceptionRecord;
84 ctx = ep->ContextRecord;
86 switch (er->ExceptionCode) {
87 case EXCEPTION_ACCESS_VIOLATION:
88 W32_SEH_HANDLE_EX(segv);
90 case EXCEPTION_ILLEGAL_INSTRUCTION:
91 W32_SEH_HANDLE_EX(ill);
93 case EXCEPTION_INT_DIVIDE_BY_ZERO:
94 case EXCEPTION_INT_OVERFLOW:
95 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
96 case EXCEPTION_FLT_OVERFLOW:
97 case EXCEPTION_FLT_UNDERFLOW:
98 case EXCEPTION_FLT_INEXACT_RESULT:
99 W32_SEH_HANDLE_EX(fpe);
102 jit_tls->mono_win_chained_exception_needs_run = TRUE;
106 if (jit_tls->mono_win_chained_exception_needs_run) {
107 /* Don't copy context back if we chained exception
108 * as the handler may have modfied the EXCEPTION_POINTERS
109 * directly. We don't pass sigcontext to chained handlers.
110 * Return continue search so the UnhandledExceptionFilter
111 * can correctly chain the exception.
113 res = EXCEPTION_CONTINUE_SEARCH;
119 void win32_seh_init()
121 mono_old_win_toplevel_exception_filter = SetUnhandledExceptionFilter(seh_unhandled_exception_filter);
122 mono_win_vectored_exception_handle = AddVectoredExceptionHandler (1, seh_vectored_exception_handler);
125 void win32_seh_cleanup()
129 if (mono_old_win_toplevel_exception_filter) SetUnhandledExceptionFilter(mono_old_win_toplevel_exception_filter);
131 ret = RemoveVectoredExceptionHandler (mono_win_vectored_exception_handle);
135 void win32_seh_set_handler(int type, MonoW32ExceptionHandler handler)
139 fpe_handler = handler;
142 ill_handler = handler;
145 segv_handler = handler;
152 #endif /* TARGET_WIN32 */
155 * mono_arch_get_restore_context:
157 * Returns a pointer to a method which restores a previously saved sigcontext.
160 mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
162 guint8 *start = NULL;
164 MonoJumpInfo *ji = NULL;
165 GSList *unwind_ops = NULL;
168 /* restore_contect (MonoContext *ctx) */
170 start = code = (guint8 *)mono_global_codeman_reserve (256);
172 amd64_mov_reg_reg (code, AMD64_R11, AMD64_ARG_REG1, 8);
174 /* Restore all registers except %rip and %r11 */
175 gregs_offset = MONO_STRUCT_OFFSET (MonoContext, gregs);
176 for (i = 0; i < AMD64_NREG; ++i) {
177 #if defined(__native_client_codegen__)
181 if (i != AMD64_RIP && i != AMD64_RSP && i != AMD64_R8 && i != AMD64_R9 && i != AMD64_R10 && i != AMD64_R11)
182 amd64_mov_reg_membase (code, i, AMD64_R11, gregs_offset + (i * 8), 8);
186 * The context resides on the stack, in the stack frame of the
187 * caller of this function. The stack pointer that we need to
188 * restore is potentially many stack frames higher up, so the
189 * distance between them can easily be more than the red zone
190 * size. Hence the stack pointer can be restored only after
191 * we have finished loading everything from the context.
193 amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, gregs_offset + (AMD64_RSP * 8), 8);
194 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, gregs_offset + (AMD64_RIP * 8), 8);
195 amd64_mov_reg_reg (code, AMD64_RSP, AMD64_R8, 8);
197 /* jump to the saved IP */
198 amd64_jump_reg (code, AMD64_R11);
200 nacl_global_codeman_validate (&start, 256, &code);
202 mono_arch_flush_icache (start, code - start);
203 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL);
206 *info = mono_tramp_info_create ("restore_context", start, code - start, ji, unwind_ops);
212 * mono_arch_get_call_filter:
214 * Returns a pointer to a method which calls an exception filter. We
215 * also use this function to call finally handlers (we pass NULL as
216 * @exc object in this case).
219 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
225 MonoJumpInfo *ji = NULL;
226 GSList *unwind_ops = NULL;
227 const guint kMaxCodeSize = NACL_SIZE (128, 256);
229 start = code = (guint8 *)mono_global_codeman_reserve (kMaxCodeSize);
231 /* call_filter (MonoContext *ctx, unsigned long eip) */
234 /* Alloc new frame */
235 amd64_push_reg (code, AMD64_RBP);
236 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
238 /* Save callee saved regs */
240 for (i = 0; i < AMD64_NREG; ++i)
241 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
242 amd64_push_reg (code, i);
248 amd64_push_reg (code, AMD64_RBP);
250 /* Make stack misaligned, the call will make it aligned again */
252 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
254 gregs_offset = MONO_STRUCT_OFFSET (MonoContext, gregs);
257 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, gregs_offset + (AMD64_RBP * 8), 8);
258 /* load callee saved regs */
259 for (i = 0; i < AMD64_NREG; ++i) {
260 #if defined(__native_client_codegen__)
264 if (AMD64_IS_CALLEE_SAVED_REG (i) && i != AMD64_RBP)
265 amd64_mov_reg_membase (code, i, AMD64_ARG_REG1, gregs_offset + (i * 8), 8);
267 /* load exc register */
268 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_ARG_REG1, gregs_offset + (AMD64_RAX * 8), 8);
270 /* call the handler */
271 amd64_call_reg (code, AMD64_ARG_REG2);
274 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
277 amd64_pop_reg (code, AMD64_RBP);
279 /* Restore callee saved regs */
280 for (i = AMD64_NREG; i >= 0; --i)
281 if (AMD64_IS_CALLEE_SAVED_REG (i))
282 amd64_pop_reg (code, i);
287 g_assert ((code - start) < kMaxCodeSize);
289 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
291 mono_arch_flush_icache (start, code - start);
292 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL);
295 *info = mono_tramp_info_create ("call_filter", start, code - start, ji, unwind_ops);
301 * The first few arguments are dummy, to force the other arguments to be passed on
302 * the stack, this avoids overwriting the argument registers in the throw trampoline.
305 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
306 guint64 dummy5, guint64 dummy6,
307 MonoContext *mctx, MonoObject *exc, gboolean rethrow)
312 /* mctx is on the caller's stack */
313 memcpy (&ctx, mctx, sizeof (MonoContext));
315 if (mono_object_isinst_checked (exc, mono_defaults.exception_class, &error)) {
316 MonoException *mono_ex = (MonoException*)exc;
318 mono_ex->stack_trace = NULL;
319 mono_ex->trace_ips = NULL;
322 mono_error_assert_ok (&error);
324 /* adjust eip so that it point into the call instruction */
325 ctx.gregs [AMD64_RIP] --;
327 mono_handle_exception (&ctx, exc);
328 mono_restore_context (&ctx);
329 g_assert_not_reached ();
333 mono_amd64_throw_corlib_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
334 guint64 dummy5, guint64 dummy6,
335 MonoContext *mctx, guint32 ex_token_index, gint64 pc_offset)
337 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
340 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
342 mctx->gregs [AMD64_RIP] -= pc_offset;
344 /* Negate the ip adjustment done in mono_amd64_throw_exception () */
345 mctx->gregs [AMD64_RIP] += 1;
347 mono_amd64_throw_exception (dummy1, dummy2, dummy3, dummy4, dummy5, dummy6, mctx, (MonoObject*)ex, FALSE);
351 mono_amd64_resume_unwind (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
352 guint64 dummy5, guint64 dummy6,
353 MonoContext *mctx, guint32 dummy7, gint64 dummy8)
355 /* Only the register parameters are valid */
358 /* mctx is on the caller's stack */
359 memcpy (&ctx, mctx, sizeof (MonoContext));
361 mono_resume_unwind (&ctx);
365 * get_throw_trampoline:
367 * Generate a call to mono_amd64_throw_exception/
368 * mono_amd64_throw_corlib_exception.
371 get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean llvm_abs, gboolean resume_unwind, const char *tramp_name, gboolean aot)
375 MonoJumpInfo *ji = NULL;
376 GSList *unwind_ops = NULL;
377 int i, stack_size, arg_offsets [16], ctx_offset, regs_offset, dummy_stack_space;
378 const guint kMaxCodeSize = NACL_SIZE (256, 512);
381 dummy_stack_space = 6 * sizeof(mgreg_t); /* Windows expects stack space allocated for all 6 dummy args. */
383 dummy_stack_space = 0;
386 start = code = (guint8 *)mono_global_codeman_reserve (kMaxCodeSize);
388 /* The stack is unaligned on entry */
389 stack_size = ALIGN_TO (sizeof (MonoContext) + 64 + dummy_stack_space, MONO_ARCH_FRAME_ALIGNMENT) + 8;
394 unwind_ops = mono_arch_get_cie_program ();
397 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, stack_size);
399 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, stack_size + 8);
402 * To hide linux/windows calling convention differences, we pass all arguments on
403 * the stack by passing 6 dummy values in registers.
406 arg_offsets [0] = dummy_stack_space + 0;
407 arg_offsets [1] = dummy_stack_space + sizeof(mgreg_t);
408 arg_offsets [2] = dummy_stack_space + sizeof(mgreg_t) * 2;
409 ctx_offset = dummy_stack_space + sizeof(mgreg_t) * 4;
410 regs_offset = ctx_offset + MONO_STRUCT_OFFSET (MonoContext, gregs);
413 for (i = 0; i < AMD64_NREG; ++i)
415 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (i * sizeof(mgreg_t)), i, sizeof(mgreg_t));
417 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, stack_size + sizeof(mgreg_t));
418 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RSP * sizeof(mgreg_t)), X86_EAX, sizeof(mgreg_t));
421 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
423 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, stack_size, sizeof(mgreg_t));
424 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RIP * sizeof(mgreg_t)), AMD64_RAX, sizeof(mgreg_t));
425 /* Set arg1 == ctx */
426 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, ctx_offset);
427 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [0], AMD64_RAX, sizeof(mgreg_t));
428 /* Set arg2 == exc/ex_token_index */
430 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [1], 0, sizeof(mgreg_t));
432 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [1], AMD64_ARG_REG1, sizeof(mgreg_t));
433 /* Set arg3 == rethrow/pc offset */
435 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], 0, sizeof(mgreg_t));
437 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [2], AMD64_ARG_REG2, sizeof(mgreg_t));
440 * The caller is LLVM code which passes the absolute address not a pc offset,
441 * so compensate by passing 0 as 'rip' and passing the negated abs address as
444 amd64_neg_membase (code, AMD64_RSP, arg_offsets [2]);
446 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], rethrow, sizeof(mgreg_t));
450 const char *icall_name;
453 icall_name = "mono_amd64_resume_unwind";
455 icall_name = "mono_amd64_throw_corlib_exception";
457 icall_name = "mono_amd64_throw_exception";
458 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
459 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
461 amd64_mov_reg_imm (code, AMD64_R11, resume_unwind ? ((gpointer)mono_amd64_resume_unwind) : (corlib ? (gpointer)mono_amd64_throw_corlib_exception : (gpointer)mono_amd64_throw_exception));
463 amd64_call_reg (code, AMD64_R11);
464 amd64_breakpoint (code);
466 mono_arch_flush_icache (start, code - start);
468 g_assert ((code - start) < kMaxCodeSize);
470 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
471 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL);
474 *info = mono_tramp_info_create (tramp_name, start, code - start, ji, unwind_ops);
480 * mono_arch_get_throw_exception:
482 * Returns a function pointer which can be used to raise
483 * exceptions. The returned function has the following
484 * signature: void (*func) (MonoException *exc);
488 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
490 return get_throw_trampoline (info, FALSE, FALSE, FALSE, FALSE, "throw_exception", aot);
494 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
496 return get_throw_trampoline (info, TRUE, FALSE, FALSE, FALSE, "rethrow_exception", aot);
500 * mono_arch_get_throw_corlib_exception:
502 * Returns a function pointer which can be used to raise
503 * corlib exceptions. The returned function has the following
504 * signature: void (*func) (guint32 ex_token, guint32 offset);
505 * Here, offset is the offset which needs to be substracted from the caller IP
506 * to get the IP of the throw. Passing the offset has the advantage that it
507 * needs no relocations in the caller.
510 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
512 return get_throw_trampoline (info, FALSE, TRUE, FALSE, FALSE, "throw_corlib_exception", aot);
516 * mono_arch_unwind_frame:
518 * This function is used to gather information from @ctx, and store it in @frame_info.
519 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
520 * is modified if needed.
521 * Returns TRUE on success, FALSE otherwise.
524 mono_arch_unwind_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
525 MonoJitInfo *ji, MonoContext *ctx,
526 MonoContext *new_ctx, MonoLMF **lmf,
527 mgreg_t **save_locations,
528 StackFrameInfo *frame)
530 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
533 memset (frame, 0, sizeof (StackFrameInfo));
539 mgreg_t regs [MONO_MAX_IREGS + 1];
541 guint32 unwind_info_len;
543 guint8 *epilog = NULL;
545 if (ji->is_trampoline)
546 frame->type = FRAME_TYPE_TRAMPOLINE;
548 frame->type = FRAME_TYPE_MANAGED;
550 unwind_info = mono_jinfo_get_unwind_info (ji, &unwind_info_len);
552 frame->unwind_info = unwind_info;
553 frame->unwind_info_len = unwind_info_len;
556 printf ("%s %p %p\n", ji->d.method->name, ji->code_start, ip);
557 mono_print_unwind_info (unwind_info, unwind_info_len);
559 /* LLVM compiled code doesn't have this info */
560 if (ji->has_arch_eh_info)
561 epilog = (guint8*)ji->code_start + ji->code_size - mono_jinfo_get_epilog_size (ji);
563 for (i = 0; i < AMD64_NREG; ++i)
564 regs [i] = new_ctx->gregs [i];
566 mono_unwind_frame (unwind_info, unwind_info_len, (guint8 *)ji->code_start,
567 (guint8*)ji->code_start + ji->code_size,
568 (guint8 *)ip, epilog ? &epilog : NULL, regs, MONO_MAX_IREGS + 1,
569 save_locations, MONO_MAX_IREGS, &cfa);
571 for (i = 0; i < AMD64_NREG; ++i)
572 new_ctx->gregs [i] = regs [i];
574 /* The CFA becomes the new SP value */
575 new_ctx->gregs [AMD64_RSP] = (mgreg_t)cfa;
578 new_ctx->gregs [AMD64_RIP] --;
584 if (((guint64)(*lmf)->previous_lmf) & 2) {
586 * This LMF entry is created by the soft debug code to mark transitions to
587 * managed code done during invokes.
589 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
591 g_assert (ext->debugger_invoke);
593 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
595 *lmf = (MonoLMF *)(((guint64)(*lmf)->previous_lmf) & ~7);
597 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
602 if (((guint64)(*lmf)->previous_lmf) & 4) {
603 MonoLMFTramp *ext = (MonoLMFTramp*)(*lmf);
605 rip = (guint64)MONO_CONTEXT_GET_IP (ext->ctx);
606 } else if (((guint64)(*lmf)->previous_lmf) & 1) {
607 /* This LMF has the rip field set */
609 } else if ((*lmf)->rsp == 0) {
614 * The rsp field is set just before the call which transitioned to native
615 * code. Obtain the rip from the stack.
617 rip = *(guint64*)((*lmf)->rsp - sizeof(mgreg_t));
620 ji = mini_jit_info_table_find (domain, (char *)rip, NULL);
622 * FIXME: ji == NULL can happen when a managed-to-native wrapper is interrupted
623 * in the soft debugger suspend code, since (*lmf)->rsp no longer points to the
631 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
633 if (((guint64)(*lmf)->previous_lmf) & 4) {
634 MonoLMFTramp *ext = (MonoLMFTramp*)(*lmf);
636 /* Trampoline frame */
637 for (i = 0; i < AMD64_NREG; ++i)
638 new_ctx->gregs [i] = ext->ctx->gregs [i];
640 new_ctx->gregs [AMD64_RIP] --;
643 * The registers saved in the LMF will be restored using the normal unwind info,
644 * when the wrapper frame is processed.
648 new_ctx->gregs [AMD64_RIP] = rip;
649 new_ctx->gregs [AMD64_RSP] = (*lmf)->rsp;
650 new_ctx->gregs [AMD64_RBP] = (*lmf)->rbp;
651 for (i = 0; i < AMD64_NREG; ++i) {
652 if (AMD64_IS_CALLEE_SAVED_REG (i) && i != AMD64_RBP)
653 new_ctx->gregs [i] = 0;
657 *lmf = (MonoLMF *)(((guint64)(*lmf)->previous_lmf) & ~7);
668 * Called by resuming from a signal handler.
671 handle_signal_exception (gpointer obj)
673 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
676 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
678 mono_handle_exception (&ctx, (MonoObject *)obj);
680 mono_restore_context (&ctx);
684 mono_arch_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
686 guint64 sp = ctx->gregs [AMD64_RSP];
688 ctx->gregs [AMD64_RDI] = (guint64)user_data;
690 /* Allocate a stack frame below the red zone */
692 /* The stack should be unaligned */
696 /* Preserve the call chain to prevent crashes in the libgcc unwinder (#15969) */
697 *(guint64*)sp = ctx->gregs [AMD64_RIP];
699 ctx->gregs [AMD64_RSP] = sp;
700 ctx->gregs [AMD64_RIP] = (guint64)async_cb;
704 * mono_arch_handle_exception:
706 * @ctx: saved processor state
707 * @obj: the exception object
710 mono_arch_handle_exception (void *sigctx, gpointer obj)
712 #if defined(MONO_ARCH_USE_SIGACTION)
716 * Handling the exception in the signal handler is problematic, since the original
717 * signal is disabled, and we could run arbitrary code though the debugger. So
718 * resume into the normal stack and do most work there if possible.
720 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
722 /* Pass the ctx parameter in TLS */
723 mono_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
725 mctx = jit_tls->ex_ctx;
726 mono_arch_setup_async_callback (&mctx, handle_signal_exception, obj);
727 mono_monoctx_to_sigctx (&mctx, sigctx);
733 mono_sigctx_to_monoctx (sigctx, &mctx);
735 mono_handle_exception (&mctx, obj);
737 mono_monoctx_to_sigctx (&mctx, sigctx);
744 mono_arch_ip_from_context (void *sigctx)
746 #if defined(MONO_ARCH_USE_SIGACTION)
747 ucontext_t *ctx = (ucontext_t*)sigctx;
749 return (gpointer)UCONTEXT_REG_RIP (ctx);
750 #elif defined(HOST_WIN32)
751 return ((CONTEXT*)sigctx)->Rip;
753 MonoContext *ctx = sigctx;
754 return (gpointer)ctx->gregs [AMD64_RIP];
759 restore_soft_guard_pages (void)
761 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
762 if (jit_tls->stack_ovf_guard_base)
763 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
767 * this function modifies mctx so that when it is restored, it
768 * won't execcute starting at mctx.eip, but in a function that
769 * will restore the protection on the soft-guard pages and return back to
770 * continue at mctx.eip.
773 prepare_for_guard_pages (MonoContext *mctx)
776 sp = (gpointer *)(mctx->gregs [AMD64_RSP]);
778 /* the return addr */
779 sp [0] = (gpointer)(mctx->gregs [AMD64_RIP]);
780 mctx->gregs [AMD64_RIP] = (guint64)restore_soft_guard_pages;
781 mctx->gregs [AMD64_RSP] = (guint64)sp;
785 altstack_handle_and_restore (MonoContext *ctx, MonoObject *obj, gboolean stack_ovf)
791 mono_handle_exception (&mctx, obj);
793 prepare_for_guard_pages (&mctx);
794 mono_restore_context (&mctx);
798 mono_arch_handle_altstack_exception (void *sigctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, gpointer fault_addr, gboolean stack_ovf)
800 #if defined(MONO_ARCH_USE_SIGACTION)
801 MonoException *exc = NULL;
802 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (char *)UCONTEXT_REG_RIP (sigctx), NULL);
805 MonoContext *copied_ctx;
808 exc = mono_domain_get ()->stack_overflow_ex;
810 mono_handle_native_sigsegv (SIGSEGV, sigctx, siginfo);
812 /* setup a call frame on the real stack so that control is returned there
813 * and exception handling can continue.
814 * The frame looks like:
818 * 128 is the size of the red zone
820 frame_size = sizeof (MonoContext) + sizeof (gpointer) * 4 + 128;
823 sp = (gpointer *)(UCONTEXT_REG_RSP (sigctx) & ~15);
824 sp = (gpointer *)((char*)sp - frame_size);
825 copied_ctx = (MonoContext*)(sp + 4);
826 /* the arguments must be aligned */
827 sp [-1] = (gpointer)UCONTEXT_REG_RIP (sigctx);
828 mono_sigctx_to_monoctx (sigctx, copied_ctx);
829 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
830 UCONTEXT_REG_RIP (sigctx) = (unsigned long)altstack_handle_and_restore;
831 UCONTEXT_REG_RSP (sigctx) = (unsigned long)(sp - 1);
832 UCONTEXT_REG_RDI (sigctx) = (unsigned long)(copied_ctx);
833 UCONTEXT_REG_RSI (sigctx) = (guint64)exc;
834 UCONTEXT_REG_RDX (sigctx) = stack_ovf;
839 mono_amd64_get_original_ip (void)
841 MonoLMF *lmf = mono_get_lmf ();
845 /* Reset the change to previous_lmf */
846 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
852 mono_amd64_get_exception_trampolines (gboolean aot)
855 GSList *tramps = NULL;
857 /* LLVM needs different throw trampolines */
858 get_throw_trampoline (&info, FALSE, TRUE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", aot);
859 tramps = g_slist_prepend (tramps, info);
861 get_throw_trampoline (&info, FALSE, TRUE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", aot);
862 tramps = g_slist_prepend (tramps, info);
864 get_throw_trampoline (&info, FALSE, TRUE, TRUE, TRUE, "llvm_resume_unwind_trampoline", aot);
865 tramps = g_slist_prepend (tramps, info);
871 mono_arch_exceptions_init (void)
877 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
878 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
879 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
880 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
881 tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
882 mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
884 /* Call this to avoid initialization races */
885 tramps = mono_amd64_get_exception_trampolines (FALSE);
886 for (l = tramps; l; l = l->next) {
887 MonoTrampInfo *info = (MonoTrampInfo *)l->data;
889 mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
890 mono_tramp_info_register (info, NULL);
892 g_slist_free (tramps);
899 * The mono_arch_unwindinfo* methods are used to build and add
900 * function table info for each emitted method from mono. On Winx64
901 * the seh handler will not be called if the mono methods are not
902 * added to the function table.
904 * We should not need to add non-volatile register info to the
905 * table since mono stores that info elsewhere. (Except for the register
909 #define MONO_MAX_UNWIND_CODES 22
911 typedef union _UNWIND_CODE {
918 } UNWIND_CODE, *PUNWIND_CODE;
920 typedef struct _UNWIND_INFO {
925 guchar FrameRegister : 4;
926 guchar FrameOffset : 4;
927 /* custom size for mono allowing for mono allowing for*/
928 /*UWOP_PUSH_NONVOL ebp offset = 21*/
929 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
930 /*UWOP_SET_FPREG : requires 2 offset = 17*/
931 /*UWOP_PUSH_NONVOL offset = 15-0*/
932 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
934 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
936 * OPTIONAL ULONG ExceptionHandler;
937 * OPTIONAL ULONG FunctionEntry;
939 * OPTIONAL ULONG ExceptionData[]; */
940 } UNWIND_INFO, *PUNWIND_INFO;
944 RUNTIME_FUNCTION runtimeFunction;
945 UNWIND_INFO unwindInfo;
946 } MonoUnwindInfo, *PMonoUnwindInfo;
949 mono_arch_unwindinfo_create (gpointer* monoui)
951 PMonoUnwindInfo newunwindinfo;
952 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
953 newunwindinfo->unwindInfo.Version = 1;
957 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
959 PMonoUnwindInfo unwindinfo;
960 PUNWIND_CODE unwindcode;
963 mono_arch_unwindinfo_create (monoui);
965 unwindinfo = (MonoUnwindInfo*)*monoui;
967 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
968 g_error ("Larger allocation needed for the unwind information.");
970 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
971 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
972 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
973 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
974 unwindcode->OpInfo = reg;
976 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
977 g_error ("Adding unwind info in wrong order.");
979 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
983 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
985 PMonoUnwindInfo unwindinfo;
986 PUNWIND_CODE unwindcode;
989 mono_arch_unwindinfo_create (monoui);
991 unwindinfo = (MonoUnwindInfo*)*monoui;
993 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
994 g_error ("Larger allocation needed for the unwind information.");
996 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
997 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
998 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1000 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1001 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1002 unwindcode->OpInfo = reg;
1004 unwindinfo->unwindInfo.FrameRegister = reg;
1006 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1007 g_error ("Adding unwind info in wrong order.");
1009 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1013 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1015 PMonoUnwindInfo unwindinfo;
1016 PUNWIND_CODE unwindcode;
1020 mono_arch_unwindinfo_create (monoui);
1022 unwindinfo = (MonoUnwindInfo*)*monoui;
1025 g_error ("Stack allocation must be equal to or greater than 0x8.");
1029 else if (size <= 0x7FFF8)
1034 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1035 g_error ("Larger allocation needed for the unwind information.");
1037 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1038 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1040 if (codesneeded == 1) {
1041 /*The size of the allocation is
1042 (the number in the OpInfo member) times 8 plus 8*/
1043 unwindcode->OpInfo = (size - 8)/8;
1044 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1047 if (codesneeded == 3) {
1048 /*the unscaled size of the allocation is recorded
1049 in the next two slots in little-endian format*/
1050 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1052 unwindcode->OpInfo = 1;
1055 /*the size of the allocation divided by 8
1056 is recorded in the next slot*/
1057 unwindcode->FrameOffset = size/8;
1059 unwindcode->OpInfo = 0;
1062 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1065 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1067 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1068 g_error ("Adding unwind info in wrong order.");
1070 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1074 mono_arch_unwindinfo_get_size (gpointer monoui)
1076 PMonoUnwindInfo unwindinfo;
1080 unwindinfo = (MonoUnwindInfo*)monoui;
1081 return (8 + sizeof (MonoUnwindInfo)) -
1082 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1085 static PRUNTIME_FUNCTION
1086 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1090 PMonoUnwindInfo targetinfo;
1091 MonoDomain *domain = mono_domain_get ();
1093 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1097 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1099 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1101 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1103 return &targetinfo->runtimeFunction;
1107 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1109 PMonoUnwindInfo unwindinfo, targetinfo;
1111 guint64 targetlocation;
1115 unwindinfo = (MonoUnwindInfo*)*monoui;
1116 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1117 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1119 unwindinfo->runtimeFunction.EndAddress = code_size;
1120 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1122 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1124 codecount = unwindinfo->unwindInfo.CountOfCodes;
1126 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1127 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1130 g_free (unwindinfo);
1133 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1138 #if MONO_SUPPORT_TASKLETS
1139 MonoContinuationRestore
1140 mono_tasklets_arch_restore (void)
1142 static guint8* saved = NULL;
1143 guint8 *code, *start;
1144 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1145 const guint kMaxCodeSize = NACL_SIZE (64, 128);
1149 return (MonoContinuationRestore)saved;
1150 code = start = (guint8 *)mono_global_codeman_reserve (kMaxCodeSize);
1151 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1152 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1153 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1154 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1155 * We move cont to cont_reg since we need both rcx and rdi for the copy
1156 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1158 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1159 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1160 /* setup the copy of the stack */
1161 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1162 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1164 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1165 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1166 amd64_prefix (code, X86_REP_PREFIX);
1169 /* now restore the registers from the LMF */
1171 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1172 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, MONO_STRUCT_OFFSET (MonoLMF, rsp), 8);
1174 /* restore the lmf chain */
1175 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1176 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1178 /* state is already in rax */
1179 amd64_jump_membase (code, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, return_ip));
1180 g_assert ((code - start) <= kMaxCodeSize);
1182 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1183 mono_arch_flush_icache (start, code - start);
1184 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL);
1187 return (MonoContinuationRestore)saved;
1192 * mono_arch_setup_resume_sighandler_ctx:
1194 * Setup CTX so execution continues at FUNC.
1197 mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
1200 * When resuming from a signal handler, the stack should be misaligned, just like right after
1203 if ((((guint64)MONO_CONTEXT_GET_SP (ctx)) % 16) == 0)
1204 MONO_CONTEXT_SET_SP (ctx, (guint64)MONO_CONTEXT_GET_SP (ctx) - 8);
1205 MONO_CONTEXT_SET_IP (ctx, func);