2 * mini-exceptions.c: generic exception support
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Mono Team (mono-list@lists.ximian.com)
8 * Copyright 2001-2003 Ximian, Inc.
9 * Copyright 2003-2008 Ximian, Inc.
17 #ifdef HAVE_EXECINFO_H
21 #ifdef HAVE_SYS_TYPES_H
22 #include <sys/types.h>
25 #ifdef HAVE_SYS_WAIT_H
33 #ifdef HAVE_SYS_SYSCALL_H
34 #include <sys/syscall.h>
37 #include <mono/metadata/appdomain.h>
38 #include <mono/metadata/tabledefs.h>
39 #include <mono/metadata/threads.h>
40 #include <mono/metadata/threads-types.h>
41 #include <mono/metadata/debug-helpers.h>
42 #include <mono/metadata/exception.h>
43 #include <mono/metadata/gc-internal.h>
44 #include <mono/metadata/mono-debug.h>
45 #include <mono/metadata/profiler.h>
46 #include <mono/utils/mono-mmap.h>
49 #include "debug-mini.h"
51 #include "debugger-agent.h"
53 #ifndef MONO_ARCH_CONTEXT_DEF
54 #define MONO_ARCH_CONTEXT_DEF
57 static gpointer restore_context_func, call_filter_func;
58 static gpointer throw_exception_func, rethrow_exception_func;
59 static gpointer throw_exception_by_name_func, throw_corlib_exception_func;
61 static gpointer try_more_restore_tramp = NULL;
62 static gpointer restore_stack_protection_tramp = NULL;
64 static void try_more_restore (void);
65 static void restore_stack_protection (void);
68 mono_exceptions_init (void)
70 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
75 restore_context_func = mono_aot_get_named_code ("restore_context");
76 call_filter_func = mono_aot_get_named_code ("call_filter");
77 throw_exception_func = mono_aot_get_named_code ("throw_exception");
78 rethrow_exception_func = mono_aot_get_named_code ("rethrow_exception");
80 restore_context_func = mono_arch_get_restore_context_full (&code_size, &ji, FALSE);
81 call_filter_func = mono_arch_get_call_filter_full (&code_size, &ji, FALSE);
82 throw_exception_func = mono_arch_get_throw_exception_full (&code_size, &ji, FALSE);
83 rethrow_exception_func = mono_arch_get_rethrow_exception_full (&code_size, &ji, FALSE);
86 restore_context_func = mono_arch_get_restore_context ();
87 call_filter_func = mono_arch_get_call_filter ();
88 throw_exception_func = mono_arch_get_throw_exception ();
89 rethrow_exception_func = mono_arch_get_rethrow_exception ();
91 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
92 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
93 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
96 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
97 mono_arch_exceptions_init ();
102 mono_get_throw_exception (void)
104 g_assert (throw_exception_func);
105 return throw_exception_func;
109 mono_get_rethrow_exception (void)
111 g_assert (rethrow_exception_func);
112 return rethrow_exception_func;
116 mono_get_call_filter (void)
118 g_assert (call_filter_func);
119 return call_filter_func;
123 mono_get_restore_context (void)
125 g_assert (restore_context_func);
126 return restore_context_func;
130 mono_get_throw_exception_by_name (void)
132 gpointer code = NULL;
133 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
138 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
139 if (throw_exception_by_name_func)
140 return throw_exception_by_name_func;
142 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
144 code = mono_aot_get_named_code ("throw_exception_by_name");
146 code = mono_arch_get_throw_exception_by_name_full (&code_size, &ji, FALSE);
148 code = mono_arch_get_throw_exception_by_name ();
151 mono_memory_barrier ();
153 throw_exception_by_name_func = code;
155 return throw_exception_by_name_func;
159 mono_get_throw_corlib_exception (void)
161 gpointer code = NULL;
162 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
167 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
168 if (throw_corlib_exception_func)
169 return throw_corlib_exception_func;
171 #if MONO_ARCH_HAVE_THROW_CORLIB_EXCEPTION
172 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
174 code = mono_aot_get_named_code ("throw_corlib_exception");
176 code = mono_arch_get_throw_corlib_exception_full (&code_size, &ji, FALSE);
178 code = mono_arch_get_throw_corlib_exception ();
181 g_assert_not_reached ();
184 mono_memory_barrier ();
186 throw_corlib_exception_func = code;
188 return throw_corlib_exception_func;
191 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
194 * find_jit_info_no_ext:
196 * If the target has the find_jit_info_ext version of this function, define the old
197 * version here which translates between the old and new APIs.
200 find_jit_info_no_ext (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
201 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
203 StackFrameInfo frame;
206 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
208 /* Avoid costly table lookup during stack overflow */
209 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
212 ji = mini_jit_info_table_find (domain, ip, NULL);
217 err = mono_arch_find_jit_info_ext (domain, jit_tls, ji, ctx, new_ctx, lmf, &frame);
221 /* Convert between the new and the old APIs */
222 switch (frame.type) {
223 case FRAME_TYPE_MANAGED:
227 case FRAME_TYPE_MANAGED_TO_NATIVE:
231 memset (res, 0, sizeof (MonoJitInfo));
232 res->method = frame.method;
235 case FRAME_TYPE_DEBUGGER_INVOKE: {
239 * The normal exception handling code can't handle this frame, so just
242 ji = find_jit_info_no_ext (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
243 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
247 g_assert_not_reached ();
254 /* mono_find_jit_info:
256 * This function is used to gather information from @ctx. It return the
257 * MonoJitInfo of the corresponding function, unwinds one stack frame and
258 * stores the resulting context into @new_ctx. It also stores a string
259 * describing the stack location into @trace (if not NULL), and modifies
260 * the @lmf if necessary. @native_offset return the IP offset from the
261 * start of the function or -1 if that info is not available.
264 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
265 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
269 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
281 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
282 ji = find_jit_info_no_ext (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
284 ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
287 if (ji == (gpointer)-1)
290 if (managed2 || (ji && ji->method->wrapper_type)) {
291 const char *real_ip, *start;
294 start = (const char *)ji->code_start;
296 /* ctx->ip points into native code */
297 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
299 real_ip = (const char*)ip;
301 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
302 offset = real_ip - start;
307 *native_offset = offset;
310 if (!ji->method->wrapper_type)
314 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
317 char *fname = mono_method_full_name (res->method, TRUE);
318 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
326 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
329 * mono_find_jit_info_ext:
331 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
335 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
336 MonoJitInfo *prev_ji, MonoContext *ctx,
337 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
338 StackFrameInfo *frame)
341 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
343 MonoDomain *target_domain;
348 /* Avoid costly table lookup during stack overflow */
349 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
352 ji = mini_jit_info_table_find (domain, ip, &target_domain);
355 target_domain = domain;
357 err = mono_arch_find_jit_info_ext (target_domain, jit_tls, ji, ctx, new_ctx, lmf, frame);
361 frame->native_offset = -1;
362 frame->domain = target_domain;
366 if (ji && (frame->managed || ji->method->wrapper_type)) {
367 const char *real_ip, *start;
369 start = (const char *)ji->code_start;
371 /* ctx->ip points into native code */
372 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
374 real_ip = (const char*)ip;
376 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
377 frame->native_offset = real_ip - start;
379 frame->native_offset = -1;
382 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
384 if (trace && frame->method) {
385 char *fname = mono_method_full_name (frame->method, TRUE);
386 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
394 #endif /* MONO_ARCH_HAVE_FIND_JIT_INFO_EXT */
397 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
399 MonoGenericJitInfo *gi;
402 if (!ji->has_generic_jit_info)
404 gi = mono_jit_info_get_generic_jit_info (ji);
409 info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
411 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
413 if (mono_method_get_context (ji->method)->method_inst) {
415 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
418 /* Avoid returning a managed object */
419 MonoObject *this_obj = info;
421 return this_obj->vtable->klass;
425 static MonoGenericContext
426 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
428 MonoGenericContext context = { NULL, NULL };
429 MonoClass *class, *method_container_class;
431 g_assert (generic_info);
433 g_assert (ji->method->is_inflated);
434 if (mono_method_get_context (ji->method)->method_inst) {
435 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
437 class = mrgctx->class_vtable->klass;
438 context.method_inst = mrgctx->method_inst;
439 g_assert (context.method_inst);
440 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
441 MonoVTable *vtable = generic_info;
443 class = vtable->klass;
445 class = generic_info;
448 g_assert (!ji->method->klass->generic_container);
449 if (ji->method->klass->generic_class)
450 method_container_class = ji->method->klass->generic_class->container_class;
452 method_container_class = ji->method->klass;
454 /* class might refer to a subclass of ji->method's class */
455 while (class->generic_class && class->generic_class->container_class != method_container_class) {
456 class = class->parent;
460 if (class->generic_class || class->generic_container)
461 context.class_inst = mini_class_get_context (class)->class_inst;
463 if (class->generic_class)
464 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
466 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
472 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
474 MonoGenericContext context;
477 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
479 context = get_generic_context_from_stack_frame (ji, generic_info);
481 method = mono_method_get_declaring_generic_method (ji->method);
482 method = mono_class_inflate_generic_method (method, &context);
488 ves_icall_System_Exception_get_trace (MonoException *ex)
490 MonoDomain *domain = mono_domain_get ();
492 MonoArray *ta = ex->trace_ips;
497 /* Exception is not thrown yet */
500 len = mono_array_length (ta) >> 1;
501 trace_str = g_string_new ("");
502 for (i = 0; i < len; i++) {
504 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
505 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
507 ji = mono_jit_info_table_find (domain, ip);
509 /* Unmanaged frame */
510 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
514 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
516 address = (char *)ip - (char *)ji->code_start;
517 location = mono_debug_print_stack_frame (
518 method, address, ex->object.vtable->domain);
520 g_string_append_printf (trace_str, "%s\n", location);
525 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
526 g_string_free (trace_str, TRUE);
532 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
534 MonoDomain *domain = mono_domain_get ();
536 MonoArray *ta = exc->trace_ips;
537 MonoDebugSourceLocation *location;
541 /* Exception is not thrown yet */
542 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
545 len = mono_array_length (ta) >> 1;
547 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
549 for (i = skip; i < len; i++) {
551 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
552 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
553 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
556 ji = mono_jit_info_table_find (domain, ip);
558 /* Unmanaged frame */
559 mono_array_setref (res, i, sf);
563 g_assert (ji != NULL);
565 method = get_method_from_stack_frame (ji, generic_info);
566 if (ji->method->wrapper_type) {
570 s = mono_method_full_name (method, TRUE);
571 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
575 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
576 sf->native_offset = (char *)ip - (char *)ji->code_start;
579 * mono_debug_lookup_source_location() returns both the file / line number information
580 * and the IL offset. Note that computing the IL offset is already an expensive
581 * operation, so we shouldn't call this method twice.
583 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
585 sf->il_offset = location->il_offset;
589 if (need_file_info) {
590 if (location && location->source_file) {
591 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
592 sf->line = location->row;
593 sf->column = location->column;
595 sf->line = sf->column = 0;
600 mono_debug_free_source_location (location);
601 mono_array_setref (res, i, sf);
609 * @domain: starting appdomain
610 * @jit_tls: JIT data for the thread
611 * @start_ctx: starting state of the stack frame
612 * @func: callback to call for each stack frame
613 * @user_data: data passed to the callback
615 * This function walks the stack of a thread, starting from the state
616 * represented by jit_tls and start_ctx. For each frame the callback
617 * function is called with the relevant info. The walk ends when no more
618 * managed stack frames are found or when the callback returns a TRUE value.
619 * Note that the function can be used to walk the stack of a thread
620 * different from the current.
623 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
625 MonoLMF *lmf = mono_get_lmf ();
626 MonoJitInfo *ji, rji;
629 MonoContext ctx, new_ctx;
633 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
635 * FIXME: mono_find_jit_info () will need to be able to return a different
636 * MonoDomain when apddomain transitions are found on the stack.
638 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
639 if (!ji || ji == (gpointer)-1)
642 if (func (domain, &new_ctx, ji, user_data))
650 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
652 MonoDomain *domain = mono_domain_get ();
653 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
654 MonoLMF *lmf = mono_get_lmf ();
655 MonoJitInfo *ji, rji;
656 gint native_offset, il_offset;
658 MonoContext ctx, new_ctx;
660 MONO_ARCH_CONTEXT_DEF
662 mono_arch_flush_register_windows ();
665 memcpy (&ctx, start_ctx, sizeof (MonoContext));
667 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
668 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
670 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
674 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
675 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
678 if (ji == (gpointer)-1)
682 MonoDebugSourceLocation *source;
684 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
685 il_offset = source ? source->il_offset : -1;
686 mono_debug_free_source_location (source);
690 if (func (ji->method, native_offset, il_offset, managed, user_data))
698 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
700 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
704 mono_jit_walk_stack_from_ctx_in_thread (MonoJitStackWalk func, MonoDomain *domain, MonoContext *start_ctx, gboolean do_il_offset, MonoInternalThread *thread, MonoLMF *lmf, gpointer user_data)
706 MonoJitTlsData *jit_tls = thread->jit_data;
708 MonoContext ctx, new_ctx;
709 StackFrameInfo frame;
710 #ifndef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
713 MonoJitInfo *ji, rji;
718 MONO_ARCH_CONTEXT_DEF
720 mono_arch_flush_register_windows ();
723 memcpy (&ctx, start_ctx, sizeof (MonoContext));
725 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
726 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
728 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
730 g_assert (thread == mono_thread_internal_current ());
733 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
735 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
736 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, &frame);
740 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
742 frame.type = FRAME_TYPE_MANAGED;
744 frame.managed = managed;
745 frame.native_offset = native_offset;
747 if (ji == (gpointer)-1)
751 if (do_il_offset && frame.ji) {
752 MonoDebugSourceLocation *source;
754 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
755 il_offset = source ? source->il_offset : -1;
756 mono_debug_free_source_location (source);
760 frame.il_offset = il_offset;
762 if (func (&frame, &ctx, user_data))
771 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
772 MonoReflectionMethod **method,
773 gint32 *iloffset, gint32 *native_offset,
774 MonoString **file, gint32 *line, gint32 *column)
776 MonoDomain *domain = mono_domain_get ();
777 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
778 MonoLMF *lmf = mono_get_lmf ();
779 MonoJitInfo *ji, rji;
780 MonoContext ctx, new_ctx, ji_ctx;
781 MonoDebugSourceLocation *location;
782 MonoMethod *last_method = NULL, *actual_method;
784 MONO_ARCH_CONTEXT_DEF;
786 mono_arch_flush_register_windows ();
788 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
789 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
791 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
796 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
799 if (ji && ji != (gpointer)-1 &&
800 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
801 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
805 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
808 /* skip all wrappers ??*/
809 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
810 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
811 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
812 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
813 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
814 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
817 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
819 * FIXME: Native-to-managed wrappers sometimes show up twice.
820 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
826 last_method = ji->method;
832 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
834 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
836 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
838 *iloffset = location->il_offset;
842 if (need_file_info) {
844 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
845 *line = location->row;
846 *column = location->column;
853 mono_debug_free_source_location (location);
860 MonoSecurityFrame *frame;
861 } MonoFrameSecurityInfo;
864 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
866 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
868 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
869 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
870 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
871 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
872 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
873 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
882 si->frame = mono_declsec_create_frame (domain, ji);
884 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
889 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
890 * @skip: the number of stack frames to skip
892 * This function returns a the security informations of a single stack frame
893 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
894 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
898 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
900 MonoDomain *domain = mono_domain_get ();
901 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
902 MonoFrameSecurityInfo si;
905 MONO_ARCH_CONTEXT_DEF
907 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
908 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
910 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
913 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
919 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
921 return (si.skips == 0) ? si.frame : NULL;
933 grow_array (MonoSecurityStack *stack)
935 MonoDomain *domain = mono_domain_get ();
936 guint32 newsize = (stack->maximum << 1);
937 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
939 for (i=0; i < stack->maximum; i++) {
940 gpointer frame = mono_array_get (stack->stack, gpointer, i);
941 mono_array_setref (newstack, i, frame);
943 stack->maximum = newsize;
944 stack->stack = newstack;
948 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
950 MonoSecurityStack *ss = (MonoSecurityStack*) data;
952 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
953 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
954 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
955 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
956 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
957 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
966 if (ss->count == ss->maximum)
969 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
971 /* continue down the stack */
976 glist_to_array (GList *list, MonoClass *eclass)
978 MonoDomain *domain = mono_domain_get ();
985 len = g_list_length (list);
986 res = mono_array_new (domain, eclass, len);
988 for (i = 0; list; list = list->next, i++)
989 mono_array_set (res, gpointer, i, list->data);
995 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
996 * @skip: the number of stack frames to skip
998 * This function returns an managed array of containing the security
999 * informations for each frame (after the skipped ones). This is used for
1000 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1004 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1006 MonoDomain *domain = mono_domain_get ();
1007 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1008 MonoSecurityStack ss;
1011 MONO_ARCH_CONTEXT_DEF
1013 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1014 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1016 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
1019 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1025 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1026 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
1027 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
1028 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1033 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1035 MonoClass *catch_class = ei->data.catch_class;
1036 MonoType *inflated_type;
1037 MonoGenericContext context;
1042 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1044 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1046 /* FIXME: we shouldn't inflate but instead put the
1047 type in the rgctx and fetch it from there. It
1048 might be a good idea to do this lazily, i.e. only
1049 when the exception is actually thrown, so as not to
1050 waste space for exception clauses which might never
1052 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1053 catch_class = mono_class_from_mono_type (inflated_type);
1054 mono_metadata_free_type (inflated_type);
1060 * mini_jit_info_table_find:
1062 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1063 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1064 * OUT_DOMAIN if it is not NULL.
1067 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1070 MonoInternalThread *t = mono_thread_internal_current ();
1076 ji = mono_jit_info_table_find (domain, addr);
1079 *out_domain = domain;
1083 for (l = t->appdomain_refs; l; l = l->next) {
1084 if (l->data != domain) {
1085 ji = mono_jit_info_table_find ((MonoDomain*)l->data, addr);
1088 *out_domain = (MonoDomain*)l->data;
1098 * mono_handle_exception_internal:
1099 * @ctx: saved processor state
1100 * @obj: the exception object
1101 * @test_only: only test if the exception is caught, but dont call handlers
1102 * @out_filter_idx: out parameter. if test_only is true, set to the index of
1103 * the first filter clause which caught the exception.
1104 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1107 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gboolean resume, gint32 *out_filter_idx, MonoJitInfo **out_ji)
1109 MonoDomain *domain = mono_domain_get ();
1110 MonoJitInfo *ji, rji;
1111 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1112 static void (*restore_context) (void *);
1113 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1114 MonoLMF *lmf = mono_get_lmf ();
1115 MonoArray *initial_trace_ips = NULL;
1116 GList *trace_ips = NULL;
1117 MonoException *mono_ex;
1118 gboolean stack_overflow = FALSE;
1119 MonoContext initial_ctx;
1120 int frame_count = 0;
1121 gboolean has_dynamic_methods = FALSE;
1122 gint32 filter_idx, first_filter_idx;
1124 g_assert (ctx != NULL);
1126 MonoException *ex = mono_get_exception_null_reference ();
1127 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1128 obj = (MonoObject *)ex;
1132 mono_debugger_agent_handle_exception (obj, ctx);
1135 * Allocate a new exception object instead of the preconstructed ones.
1137 if (obj == domain->stack_overflow_ex) {
1139 * It is not a good idea to try and put even more pressure on the little stack available.
1140 * obj = mono_get_exception_stack_overflow ();
1142 stack_overflow = TRUE;
1144 else if (obj == domain->null_reference_ex) {
1145 obj = mono_get_exception_null_reference ();
1148 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1149 mono_ex = (MonoException*)obj;
1150 initial_trace_ips = mono_ex->trace_ips;
1155 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1156 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1157 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1158 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1159 mono_ex->message = mono_string_new (domain, msg);
1166 call_filter = mono_get_call_filter ();
1168 if (!restore_context)
1169 restore_context = mono_get_restore_context ();
1171 g_assert (jit_tls->end_of_stack);
1172 g_assert (jit_tls->abort_func);
1175 MonoContext ctx_cp = *ctx;
1176 if (mono_trace_is_enabled ())
1177 g_print ("[%p:] EXCEPTION handling: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name);
1178 mono_profiler_exception_thrown (obj);
1179 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, FALSE, &first_filter_idx, out_ji)) {
1180 if (mono_break_on_exc)
1182 // FIXME: This runs managed code so it might cause another stack overflow when
1183 // we are handling a stack overflow
1184 mono_debugger_agent_handle_unhandled_exception (obj, ctx);
1185 mono_unhandled_exception (obj);
1190 *out_filter_idx = -1;
1195 memset (&rji, 0, sizeof (rji));
1198 MonoContext new_ctx;
1201 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
1202 NULL, &lmf, NULL, NULL);
1204 g_warning ("Exception inside function without unwind info");
1205 g_assert_not_reached ();
1208 if (ji != (gpointer)-1 && !(ji->code_start <= MONO_CONTEXT_GET_IP (ctx) && (((guint8*)ji->code_start + ji->code_size >= (guint8*)MONO_CONTEXT_GET_IP (ctx))))) {
1210 * The exception was raised in native code and we got back to managed code
1217 if (ji != (gpointer)-1) {
1219 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
1221 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1223 * Avoid overwriting the stack trace if the exception is
1224 * rethrown. Also avoid giant stack traces during a stack
1227 if (!initial_trace_ips && (frame_count < 1000)) {
1228 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1229 trace_ips = g_list_prepend (trace_ips,
1230 get_generic_info_from_stack_frame (ji, ctx));
1234 if (ji->method->dynamic)
1235 has_dynamic_methods = TRUE;
1238 #ifndef MONO_ARCH_STACK_GROWS_UP
1239 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1241 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1244 free_stack = 0xffffff;
1247 * During stack overflow, wait till the unwinding frees some stack
1248 * space before running handlers/finalizers.
1250 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
1253 for (i = 0; i < ji->num_clauses; i++) {
1254 MonoJitExceptionInfo *ei = &ji->clauses [i];
1255 gboolean filtered = FALSE;
1257 #if defined(__s390__)
1259 * This is required in cases where a try block starts immediately after
1260 * a call which causes an exception. Testcase: tests/exception8.cs.
1261 * FIXME: Clean this up.
1263 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
1265 if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1267 MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1269 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1271 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1272 if (ji->from_llvm) {
1273 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1274 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, obj);
1276 g_assert_not_reached ();
1279 /* store the exception object in bp + ei->exvar_offset */
1280 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1284 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1286 mono_perfcounters->exceptions_filters++;
1287 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1288 filtered = call_filter (ctx, ei->data.filter);
1289 if (filtered && out_filter_idx)
1290 *out_filter_idx = filter_idx;
1296 * Filter clauses should only be run in the
1297 * first pass of exception handling.
1299 filtered = (filter_idx == first_filter_idx);
1304 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1305 mono_object_isinst (obj, catch_class)) || filtered) {
1307 if (mono_ex && !initial_trace_ips) {
1308 trace_ips = g_list_reverse (trace_ips);
1309 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1310 if (has_dynamic_methods)
1311 /* These methods could go away anytime, so compute the stack trace now */
1312 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1314 g_list_free (trace_ips);
1318 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1319 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1320 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1321 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1322 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1323 *(mono_get_lmf_addr ()) = lmf;
1324 mono_perfcounters->exceptions_depth += frame_count;
1325 if (obj == domain->stack_overflow_ex)
1326 jit_tls->handling_stack_ovf = FALSE;
1330 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1331 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1332 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1333 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1334 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1335 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1336 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1337 call_filter (ctx, ei->handler_start);
1339 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1340 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1341 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1342 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1343 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1344 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1345 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1346 mono_perfcounters->exceptions_finallys++;
1347 *(mono_get_lmf_addr ()) = lmf;
1348 if (ji->from_llvm) {
1350 * LLVM compiled finally handlers follow the design
1351 * of the c++ ehabi, i.e. they call a resume function
1352 * at the end instead of returning to the caller.
1353 * So save the exception handling state,
1354 * mono_resume_unwind () will call us again to continue
1357 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1358 *(mono_get_lmf_addr ()) = lmf;
1359 jit_tls->ex_ctx = new_ctx;
1360 jit_tls->ex_obj = obj;
1363 call_filter (ctx, ei->handler_start);
1371 mono_profiler_exception_method_leave (ji->method);
1376 if (ji == (gpointer)-1) {
1379 *(mono_get_lmf_addr ()) = lmf;
1381 jit_tls->abort_func (obj);
1382 g_assert_not_reached ();
1384 if (mono_ex && !initial_trace_ips) {
1385 trace_ips = g_list_reverse (trace_ips);
1386 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1387 if (has_dynamic_methods)
1388 /* These methods could go away anytime, so compute the stack trace now */
1389 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1391 g_list_free (trace_ips);
1397 g_assert_not_reached ();
1401 * mono_debugger_handle_exception:
1403 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1404 * at the exception and FALSE to resume with the normal exception handling.
1406 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1407 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1408 * `callq throw' instruction.
1411 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1413 MonoDebuggerExceptionAction action;
1415 if (!mono_debug_using_mono_debugger ())
1419 MonoException *ex = mono_get_exception_null_reference ();
1420 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1421 obj = (MonoObject *)ex;
1424 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1426 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1428 * The debugger wants us to stop on the `throw' instruction.
1429 * By the time we get here, it already inserted a breakpoint there.
1432 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1433 MonoContext ctx_cp = *ctx;
1434 MonoJitInfo *ji = NULL;
1438 * The debugger wants us to stop only if this exception is user-unhandled.
1441 ret = mono_handle_exception_internal (&ctx_cp, obj, MONO_CONTEXT_GET_IP (ctx), TRUE, FALSE, NULL, &ji);
1442 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1444 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1445 * inside the method being invoked, so we handle it like a user-unhandled exception.
1452 * The exception is user-unhandled - tell the debugger to stop.
1454 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1458 * The exception is catched somewhere - resume with the normal exception handling and don't
1459 * stop in the debugger.
1467 * mono_debugger_run_finally:
1468 * @start_ctx: saved processor state
1470 * This method is called by the Mono Debugger to call all `finally' clauses of the
1471 * current stack frame. It's used when the user issues a `return' command to make
1472 * the current stack frame return. After returning from this method, the debugger
1473 * unwinds the stack one frame and gives control back to the user.
1475 * NOTE: This method is only used when running inside the Mono Debugger.
1478 mono_debugger_run_finally (MonoContext *start_ctx)
1480 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1481 MonoDomain *domain = mono_domain_get ();
1482 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1483 MonoLMF *lmf = mono_get_lmf ();
1484 MonoContext ctx, new_ctx;
1485 MonoJitInfo *ji, rji;
1490 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1491 if (!ji || ji == (gpointer)-1)
1495 call_filter = mono_get_call_filter ();
1497 for (i = 0; i < ji->num_clauses; i++) {
1498 MonoJitExceptionInfo *ei = &ji->clauses [i];
1500 if ((ei->try_start <= MONO_CONTEXT_GET_IP (&ctx)) &&
1501 (MONO_CONTEXT_GET_IP (&ctx) < ei->try_end) &&
1502 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1503 call_filter (&ctx, ei->handler_start);
1509 * mono_handle_exception:
1510 * @ctx: saved processor state
1511 * @obj: the exception object
1512 * @test_only: only test if the exception is caught, but dont call handlers
1515 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1518 mono_perfcounters->exceptions_thrown++;
1520 return mono_handle_exception_internal (ctx, obj, original_ip, test_only, FALSE, NULL, NULL);
1523 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1525 #ifndef MONO_ARCH_USE_SIGACTION
1526 #error "Can't use sigaltstack without sigaction"
1529 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1532 mono_setup_altstack (MonoJitTlsData *tls)
1535 struct sigaltstack sa;
1536 guint8 *staddr = NULL;
1538 if (mono_running_on_valgrind ())
1541 mono_thread_get_stack_bounds (&staddr, &stsize);
1545 tls->end_of_stack = staddr + stsize;
1547 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1549 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1550 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1552 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1553 /* mprotect can fail for the main thread stack */
1554 gpointer gaddr = mono_valloc (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON|MONO_MMAP_FIXED);
1555 g_assert (gaddr == tls->stack_ovf_guard_base);
1559 * threads created by nptl does not seem to have a guard page, and
1560 * since the main thread is not created by us, we can't even set one.
1561 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1562 * is a stack overflow exception.
1564 tls->stack_size = stsize + mono_pagesize ();
1566 /* Setup an alternate signal stack */
1567 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1568 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1570 g_assert (tls->signal_stack);
1572 sa.ss_sp = tls->signal_stack;
1573 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1574 sa.ss_flags = SS_ONSTACK;
1575 sigaltstack (&sa, NULL);
1579 mono_free_altstack (MonoJitTlsData *tls)
1581 struct sigaltstack sa;
1584 sa.ss_sp = tls->signal_stack;
1585 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1586 sa.ss_flags = SS_DISABLE;
1587 err = sigaltstack (&sa, NULL);
1588 g_assert (err == 0);
1590 if (tls->signal_stack)
1591 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1594 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1597 mono_setup_altstack (MonoJitTlsData *tls)
1602 mono_free_altstack (MonoJitTlsData *tls)
1606 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1609 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1611 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1612 /* we need to leave some room for throwing the exception */
1613 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1614 unprotect_size -= mono_pagesize ();
1615 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1616 * is sufficient stack
1618 //fprintf (stderr, "restoring stack protection: %p-%p (%d)\n", jit_tls->stack_ovf_guard_base, (char*)jit_tls->stack_ovf_guard_base + unprotect_size, unprotect_size);
1620 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1621 return unprotect_size == jit_tls->stack_ovf_guard_size;
1625 try_more_restore (void)
1627 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1628 if (try_restore_stack_protection (jit_tls, 500))
1629 jit_tls->restore_stack_prot = NULL;
1633 restore_stack_protection (void)
1635 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1636 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1637 /* if we can't restore the stack protection, keep a callback installed so
1638 * we'll try to restore as much stack as we can at each return from unmanaged
1641 if (try_restore_stack_protection (jit_tls, 4096))
1642 jit_tls->restore_stack_prot = NULL;
1644 jit_tls->restore_stack_prot = try_more_restore_tramp;
1645 /* here we also throw a stack overflow exception */
1646 ex->trace_ips = NULL;
1647 ex->stack_trace = NULL;
1648 mono_raise_exception (ex);
1652 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1654 void (*func)(void) = (gpointer)tramp_data;
1660 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1662 /* we got a stack overflow in the soft-guard pages
1663 * There are two cases:
1664 * 1) managed code caused the overflow: we unprotect the soft-guard page
1665 * and let the arch-specific code trigger the exception handling mechanism
1666 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1667 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1668 * and hope we can continue with those enabled, at least until the hard-guard page
1669 * is hit. The alternative to continuing here is to just print a message and abort.
1670 * We may add in the future the code to protect the pages again in the codepath
1671 * when we return from unmanaged to managed code.
1673 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1674 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1675 /* we unprotect the minimum amount we can */
1677 gboolean handled = FALSE;
1679 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1680 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1681 guard_size -= mono_pagesize ();
1683 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1684 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1685 mono_mprotect ((char*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size - guard_size, guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1686 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1688 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1693 /* We print a message: after this even managed stack overflows
1694 * may crash the runtime
1696 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1697 if (!jit_tls->handling_stack_ovf) {
1698 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1699 jit_tls->handling_stack_ovf = 1;
1701 /*fprintf (stderr, "Already handling stack overflow\n");*/
1710 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1712 FILE *stream = (FILE*)data;
1715 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1716 fprintf (stream, " %s\n", location);
1719 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1724 static G_GNUC_UNUSED gboolean
1725 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1728 GString *p = (GString*)data;
1731 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1732 g_string_append_printf (p, " %s\n", location);
1735 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1740 static gboolean handling_sigsegv = FALSE;
1743 * mono_handle_native_sigsegv:
1745 * Handle a SIGSEGV received while in native code by printing diagnostic
1746 * information and aborting.
1749 mono_handle_native_sigsegv (int signal, void *ctx)
1751 #ifdef MONO_ARCH_USE_SIGACTION
1752 struct sigaction sa;
1754 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1756 if (handling_sigsegv)
1759 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1760 fprintf (stderr, "Received SIGSEGV, suspending...");
1765 /* To prevent infinite loops when the stack walk causes a crash */
1766 handling_sigsegv = TRUE;
1768 /* !jit_tls means the thread was not registered with the runtime */
1770 fprintf (stderr, "Stacktrace:\n\n");
1772 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1777 #ifdef HAVE_BACKTRACE_SYMBOLS
1782 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1784 fprintf (stderr, "\nNative stacktrace:\n\n");
1786 size = backtrace (array, 256);
1787 names = backtrace_symbols (array, size);
1788 for (i =0; i < size; ++i) {
1789 fprintf (stderr, "\t%s\n", names [i]);
1795 /* Try to get more meaningful information using gdb */
1797 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1798 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1799 /* From g_spawn_command_line_sync () in eglib */
1801 int stdout_pipe [2] = { -1, -1 };
1806 res = pipe (stdout_pipe);
1807 g_assert (res != -1);
1811 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1812 * it will deadlock. Call the syscall directly instead.
1814 pid = mono_runtime_syscall_fork ();
1817 close (stdout_pipe [0]);
1818 dup2 (stdout_pipe [1], STDOUT_FILENO);
1820 for (i = getdtablesize () - 1; i >= 3; i--)
1823 if (!mono_gdb_render_native_backtraces ())
1824 close (STDOUT_FILENO);
1829 close (stdout_pipe [1]);
1831 fprintf (stderr, "\nDebug info from gdb:\n\n");
1834 int nread = read (stdout_pipe [0], buffer, 1024);
1838 write (STDERR_FILENO, buffer, nread);
1841 waitpid (pid, &status, WNOHANG);
1845 * A SIGSEGV indicates something went very wrong so we can no longer depend
1846 * on anything working. So try to print out lots of diagnostics, starting
1847 * with ones which have a greater chance of working.
1851 "=================================================================\n"
1852 "Got a %s while executing native code. This usually indicates\n"
1853 "a fatal error in the mono runtime or one of the native libraries \n"
1854 "used by your application.\n"
1855 "=================================================================\n"
1861 #ifdef MONO_ARCH_USE_SIGACTION
1863 /* Remove our SIGABRT handler */
1864 sa.sa_handler = SIG_DFL;
1865 sigemptyset (&sa.sa_mask);
1868 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1876 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
1878 MonoInternalThread *thread = mono_thread_internal_current ();
1879 #if defined(__i386__) || defined(__x86_64__)
1882 GString* text = g_string_new (0);
1883 char *name, *wapi_desc;
1884 GError *error = NULL;
1887 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
1889 g_string_append_printf (text, "\n\"%s\"", name);
1892 else if (thread->threadpool_thread)
1893 g_string_append (text, "\n\"<threadpool thread>\"");
1895 g_string_append (text, "\n\"<unnamed thread>\"");
1898 wapi_desc = wapi_current_thread_desc ();
1899 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
1903 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
1905 memcpy (&ctx, start_ctx, sizeof (MonoContext));
1907 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
1909 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
1911 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
1913 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
1916 fprintf (stdout, "%s", text->str);
1917 g_string_free (text, TRUE);
1922 * mono_print_thread_dump:
1924 * Print information about the current thread to stdout.
1925 * SIGCTX can be NULL, allowing this to be called from gdb.
1928 mono_print_thread_dump (void *sigctx)
1930 mono_print_thread_dump_internal (sigctx, NULL);
1934 mono_print_thread_dump_from_ctx (MonoContext *ctx)
1936 mono_print_thread_dump_internal (NULL, ctx);
1940 * mono_resume_unwind:
1942 * This is called by code at the end of LLVM compiled finally clauses to continue
1946 mono_resume_unwind (void)
1948 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1949 static void (*restore_context) (MonoContext *);
1952 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
1954 mono_handle_exception_internal (&ctx, jit_tls->ex_obj, NULL, FALSE, TRUE, NULL, NULL);
1956 if (!restore_context)
1957 restore_context = mono_get_restore_context ();
1959 restore_context (&ctx);