#ifndef PLATFORM_WIN32
#include <sys/types.h>
+#include <sys/wait.h>
#include <unistd.h>
#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_SYSCALL_H
+#include <sys/syscall.h>
+#endif
+
#include <mono/metadata/appdomain.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/threads.h>
+#include <mono/metadata/threads-types.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/exception.h>
#include <mono/metadata/gc-internal.h>
#include <mono/metadata/mono-debug.h>
#include <mono/metadata/profiler.h>
+#include <mono/utils/mono-mmap.h>
#include "mini.h"
#include "trace.h"
-#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
-#include <unistd.h>
-#include <sys/mman.h>
+#ifndef MONO_ARCH_CONTEXT_DEF
+#define MONO_ARCH_CONTEXT_DEF
#endif
-/* FreeBSD and NetBSD need SA_STACK and MAP_ANON re-definitions */
-# if defined(__FreeBSD__) || defined(__NetBSD__)
-# ifndef SA_STACK
-# define SA_STACK SA_ONSTACK
-# endif
-# ifndef MAP_ANONYMOUS
-# define MAP_ANONYMOUS MAP_ANON
-# endif
-# endif /* BSDs */
+static gpointer restore_context_func, call_filter_func;
+static gpointer throw_exception_func, rethrow_exception_func;
+static gpointer throw_exception_by_name_func, throw_corlib_exception_func;
-#define IS_ON_SIGALTSTACK(jit_tls) ((jit_tls) && ((guint8*)&(jit_tls) > (guint8*)(jit_tls)->signal_stack) && ((guint8*)&(jit_tls) < ((guint8*)(jit_tls)->signal_stack + (jit_tls)->signal_stack_size)))
+static gpointer try_more_restore_tramp = NULL;
+static gpointer restore_stack_protection_tramp = NULL;
-#ifndef MONO_ARCH_CONTEXT_DEF
-#define MONO_ARCH_CONTEXT_DEF
+static void try_more_restore (void);
+static void restore_stack_protection (void);
+
+void
+mono_exceptions_init (void)
+{
+#ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
+ guint32 code_size;
+ MonoJumpInfo *ji;
+
+ if (mono_aot_only) {
+ restore_context_func = mono_aot_get_named_code ("restore_context");
+ call_filter_func = mono_aot_get_named_code ("call_filter");
+ throw_exception_func = mono_aot_get_named_code ("throw_exception");
+ rethrow_exception_func = mono_aot_get_named_code ("rethrow_exception");
+ } else {
+ restore_context_func = mono_arch_get_restore_context_full (&code_size, &ji, FALSE);
+ call_filter_func = mono_arch_get_call_filter_full (&code_size, &ji, FALSE);
+ throw_exception_func = mono_arch_get_throw_exception_full (&code_size, &ji, FALSE);
+ rethrow_exception_func = mono_arch_get_rethrow_exception_full (&code_size, &ji, FALSE);
+ }
+#else
+ restore_context_func = mono_arch_get_restore_context ();
+ call_filter_func = mono_arch_get_call_filter ();
+ throw_exception_func = mono_arch_get_throw_exception ();
+ rethrow_exception_func = mono_arch_get_rethrow_exception ();
+#endif
+#ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
+ try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
+ restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
+#endif
+}
+
+gpointer
+mono_get_throw_exception (void)
+{
+ g_assert (throw_exception_func);
+ return throw_exception_func;
+}
+
+gpointer
+mono_get_rethrow_exception (void)
+{
+ g_assert (rethrow_exception_func);
+ return rethrow_exception_func;
+}
+
+gpointer
+mono_get_call_filter (void)
+{
+ g_assert (call_filter_func);
+ return call_filter_func;
+}
+
+gpointer
+mono_get_restore_context (void)
+{
+ g_assert (restore_context_func);
+ return restore_context_func;
+}
+
+gpointer
+mono_get_throw_exception_by_name (void)
+{
+ gpointer code = NULL;
+#ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
+ guint32 code_size;
+ MonoJumpInfo *ji;
#endif
-#ifndef mono_find_jit_info
+ /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
+ if (throw_exception_by_name_func)
+ return throw_exception_by_name_func;
+
+#ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
+ if (mono_aot_only)
+ code = mono_aot_get_named_code ("throw_exception_by_name");
+ else
+ code = mono_arch_get_throw_exception_by_name_full (&code_size, &ji, FALSE);
+#else
+ code = mono_arch_get_throw_exception_by_name ();
+#endif
+
+ mono_memory_barrier ();
+
+ throw_exception_by_name_func = code;
+
+ return throw_exception_by_name_func;
+}
+
+gpointer
+mono_get_throw_corlib_exception (void)
+{
+ gpointer code = NULL;
+#ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
+ guint32 code_size;
+ MonoJumpInfo *ji;
+#endif
+
+ /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
+ if (throw_corlib_exception_func)
+ return throw_corlib_exception_func;
+
+#if MONO_ARCH_HAVE_THROW_CORLIB_EXCEPTION
+#ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
+ if (mono_aot_only)
+ code = mono_aot_get_named_code ("throw_corlib_exception");
+ else
+ code = mono_arch_get_throw_corlib_exception_full (&code_size, &ji, FALSE);
+#else
+ code = mono_arch_get_throw_corlib_exception ();
+#endif
+#else
+ g_assert_not_reached ();
+#endif
+
+ mono_memory_barrier ();
+
+ throw_corlib_exception_func = code;
+
+ return throw_corlib_exception_func;
+}
/* mono_find_jit_info:
*
* the @lmf if necessary. @native_offset return the IP offset from the
* start of the function or -1 if that info is not available.
*/
-static MonoJitInfo *
+MonoJitInfo *
mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
gboolean *managed)
if (managed)
*managed = FALSE;
- ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, NULL, lmf, NULL, &managed2);
+ ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
if (ji == (gpointer)-1)
return ji;
return ji;
}
-#endif /* mono_find_jit_info */
-
MonoString *
ves_icall_System_Exception_get_trace (MonoException *ex)
{
sf->il_offset = 0;
if (need_file_info) {
- if (location) {
+ if (location && location->source_file) {
MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
sf->line = location->row;
sf->column = location->column;
}
}
-#ifndef CUSTOM_STACK_WALK
-
void
mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
{
#endif
}
- while (MONO_CONTEXT_GET_BP (&ctx) < jit_tls->end_of_stack) {
+ while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
g_assert (ji);
MonoJitInfo *ji, rji;
MonoContext ctx, new_ctx;
MonoDebugSourceLocation *location;
+ MonoMethod *last_method = NULL;
MONO_ARCH_CONTEXT_DEF;
MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
#endif
- /*
- * FIXME: This is needed because of the LMF stuff which doesn't exist on ia64.
- * Probably the whole mono_find_jit_info () stuff needs to be fixed so this isn't
- * needed even on other platforms. This is also true for s390/s390x.
- */
-#if !defined(__ia64__) && !defined(__s390__) && !defined(__s390x__)
- skip++;
-#endif
-
do {
ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, native_offset, NULL);
-
+
ctx = new_ctx;
if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
- ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE)
+ ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
+ ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
+ continue;
+
+ if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
+ /*
+ * FIXME: Native-to-managed wrappers sometimes show up twice.
+ * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
+ * isn't needed.
+ */
continue;
+ }
+
+ last_method = ji->method;
skip--;
return TRUE;
}
-#endif /* CUSTOM_STACK_WALK */
-
typedef struct {
guint32 skips;
MonoSecurityFrame *frame;
MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
#endif
+#if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
+ skip--;
+#endif
+
si.skips = skip;
si.frame = NULL;
mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
#endif
+#if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
+ skip--;
+#endif
+
ss.skips = skip;
ss.count = 0;
ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
return ss.stack;
}
-#ifndef CUSTOM_EXCEPTION_HANDLING
+static MonoClass*
+get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
+{
+ MonoClass *catch_class = ei->data.catch_class;
+ MonoGenericJitInfo *gi;
+ gpointer info;
+ MonoClass *class, *method_container_class;
+ MonoType *inflated_type;
+ MonoGenericContext context = { NULL, NULL };
+
+ if (!catch_class)
+ return NULL;
+
+ if (!ji->has_generic_jit_info)
+ return catch_class;
+
+ gi = mono_jit_info_get_generic_jit_info (ji);
+ if (!gi->has_this)
+ return catch_class;
+
+ if (gi->this_in_reg)
+ info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
+ else
+ info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
+ gi->this_offset);
+
+ g_assert (ji->method->is_inflated);
+
+ if (mono_method_get_context (ji->method)->method_inst) {
+ MonoMethodRuntimeGenericContext *mrgctx = info;
+
+ class = mrgctx->class_vtable->klass;
+ context.method_inst = mrgctx->method_inst;
+ g_assert (context.method_inst);
+ } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
+ MonoVTable *vtable = info;
+
+ class = vtable->klass;
+ } else {
+ MonoObject *this = info;
+
+ class = this->vtable->klass;
+ }
+
+ if (class->generic_class || class->generic_container)
+ context.class_inst = mini_class_get_context (class)->class_inst;
+
+ g_assert (!ji->method->klass->generic_container);
+ if (ji->method->klass->generic_class)
+ method_container_class = ji->method->klass->generic_class->container_class;
+ else
+ method_container_class = ji->method->klass;
+
+ if (class->generic_class)
+ g_assert (class->generic_class->container_class == method_container_class);
+ else
+ g_assert (!class->generic_container && class == method_container_class);
+
+ /* FIXME: we shouldn't inflate but instead put the
+ type in the rgctx and fetch it from there. It
+ might be a good idea to do this lazily, i.e. only
+ when the exception is actually thrown, so as not to
+ waste space for exception clauses which might never
+ be encountered. */
+ inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
+ catch_class = mono_class_from_mono_type (inflated_type);
+ mono_metadata_free_type (inflated_type);
+
+ return catch_class;
+}
/**
* mono_handle_exception_internal:
gboolean stack_overflow = FALSE;
MonoContext initial_ctx;
int frame_count = 0;
- gboolean gc_disabled = FALSE;
gboolean has_dynamic_methods = FALSE;
gint32 filter_idx, first_filter_idx;
-
- /*
- * This function might execute on an alternate signal stack, and Boehm GC
- * can't handle that.
- * Also, since the altstack is small, stack space intensive operations like
- * JIT compilation should be avoided.
- */
- if (IS_ON_SIGALTSTACK (jit_tls)) {
- /*
- * FIXME: disabling/enabling GC while already on a signal stack might
- * not be safe either.
- */
- /* Have to reenable it later */
- gc_disabled = TRUE;
- mono_gc_disable ();
- }
g_assert (ctx != NULL);
if (!obj) {
/*
* Allocate a new exception object instead of the preconstructed ones.
- * We can't do this in sigsegv_signal_handler, since GC is not yet
- * disabled.
*/
if (obj == domain->stack_overflow_ex) {
- obj = mono_get_exception_stack_overflow ();
+ /*
+ * It is not a good idea to try and put even more pressure on the little stack available.
+ * obj = mono_get_exception_stack_overflow ();
+ */
stack_overflow = TRUE;
}
else if (obj == domain->null_reference_ex) {
mono_ex = NULL;
}
+ if (mono_ex && jit_tls->class_cast_to && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
+ char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
+ char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
+ char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
+ mono_ex->message = mono_string_new (domain, msg);
+ g_free (from_name);
+ g_free (to_name);
+ g_free (msg);
+ }
+
if (!call_filter)
- call_filter = mono_arch_get_call_filter ();
+ call_filter = mono_get_call_filter ();
if (!restore_context)
- restore_context = mono_arch_get_restore_context ();
+ restore_context = mono_get_restore_context ();
g_assert (jit_tls->end_of_stack);
g_assert (jit_tls->abort_func);
if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, &first_filter_idx)) {
if (mono_break_on_exc)
G_BREAKPOINT ();
+ // FIXME: This runs managed code so it might cause another stack overflow when
+ // we are handling a stack overflow
mono_unhandled_exception (obj);
if (mono_debugger_unhandled_exception (original_ip, MONO_CONTEXT_GET_SP (ctx), obj)) {
g_assert_not_reached ();
}
+ 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))))) {
+ /*
+ * The exception was raised in native code and we got back to managed code
+ * using the LMF.
+ */
+ *ctx = new_ctx;
+ continue;
+ }
+
if (ji != (gpointer)-1) {
frame_count ++;
//printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
MonoJitExceptionInfo *ei = &ji->clauses [i];
gboolean filtered = FALSE;
-#ifdef __s390__
+#if defined(__s390__)
+ /*
+ * This is required in cases where a try block starts immediately after
+ * a call which causes an exception. Testcase: tests/exception8.cs.
+ * FIXME: Clean this up.
+ */
if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
#else
if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
#endif
MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
/* catch block */
+ MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
/* store the exception object in bp + ei->exvar_offset */
if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
// mono_debugger_handle_exception (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
if (test_only) {
+ mono_perfcounters->exceptions_filters++;
filtered = call_filter (ctx, ei->data.filter);
if (filtered && out_filter_idx)
*out_filter_idx = filter_idx;
}
if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
- mono_object_isinst (obj, ei->data.catch_class)) || filtered) {
+ mono_object_isinst (obj, catch_class)) || filtered) {
if (test_only) {
if (mono_ex && !initial_trace_ips) {
trace_ips = g_list_reverse (trace_ips);
}
g_list_free (trace_ips);
- if (gc_disabled)
- mono_gc_enable ();
return TRUE;
}
if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
mono_debugger_handle_exception (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
*(mono_get_lmf_addr ()) = lmf;
+ mono_perfcounters->exceptions_depth += frame_count;
+ if (obj == domain->stack_overflow_ex)
+ jit_tls->handling_stack_ovf = FALSE;
- if (gc_disabled)
- mono_gc_enable ();
return 0;
}
if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
mono_debugger_handle_exception (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
+ mono_perfcounters->exceptions_finallys++;
call_filter (ctx, ei->handler_start);
}
*ctx = new_ctx;
if (ji == (gpointer)-1) {
- if (gc_disabled)
- mono_gc_enable ();
if (!test_only) {
*(mono_get_lmf_addr ()) = lmf;
- if (IS_ON_SIGALTSTACK (jit_tls)) {
- /* Switch back to normal stack */
- if (stack_overflow) {
- /* Free up some stack space */
-#ifndef MONO_ARCH_STACK_GROWS_UP
- MONO_CONTEXT_SET_SP (&initial_ctx, (gssize)(MONO_CONTEXT_GET_SP (&initial_ctx)) + (64 * 1024));
- g_assert ((gssize)MONO_CONTEXT_GET_SP (&initial_ctx) < (gssize)jit_tls->end_of_stack);
-#else
- MONO_CONTEXT_SET_SP (&initial_ctx, (gssize)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (64 * 1024));
- g_assert ((gssize)MONO_CONTEXT_GET_SP (&initial_ctx) > (gssize)jit_tls->end_of_stack);
-#endif
- }
-#ifdef MONO_CONTEXT_SET_FUNC
- /* jit_tls->abort_func is a function descriptor on ia64 */
- MONO_CONTEXT_SET_FUNC (&initial_ctx, (gssize)jit_tls->abort_func);
-#else
- MONO_CONTEXT_SET_IP (&initial_ctx, (gssize)jit_tls->abort_func);
-#endif
- restore_context (&initial_ctx);
- }
- else
- jit_tls->abort_func (obj);
+ jit_tls->abort_func (obj);
g_assert_not_reached ();
} else {
if (mono_ex && !initial_trace_ips) {
return;
if (!call_filter)
- call_filter = mono_arch_get_call_filter ();
+ call_filter = mono_get_call_filter ();
for (i = 0; i < ji->num_clauses; i++) {
MonoJitExceptionInfo *ei = &ji->clauses [i];
gboolean
mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
{
+ if (!test_only)
+ mono_perfcounters->exceptions_thrown++;
return mono_handle_exception_internal (ctx, obj, original_ip, test_only, NULL);
}
-#endif /* CUSTOM_EXCEPTION_HANDLING */
-
#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
+#ifndef MONO_ARCH_USE_SIGACTION
+#error "Can't use sigaltstack without sigaction"
+#endif
+
void
mono_setup_altstack (MonoJitTlsData *tls)
{
- pthread_t self = pthread_self();
- pthread_attr_t attr;
size_t stsize = 0;
struct sigaltstack sa;
guint8 *staddr = NULL;
- guint8 *current = (guint8*)&staddr;
if (mono_running_on_valgrind ())
return;
- /* Determine stack boundaries */
- pthread_attr_init( &attr );
-#ifdef HAVE_PTHREAD_GETATTR_NP
- pthread_getattr_np( self, &attr );
-#else
-#ifdef HAVE_PTHREAD_ATTR_GET_NP
- pthread_attr_get_np( self, &attr );
-#elif defined(sun)
- pthread_attr_getstacksize( &attr, &stsize );
-#else
-#error "Not implemented"
-#endif
-#endif
+ mono_thread_get_stack_bounds (&staddr, &stsize);
-#ifndef sun
- pthread_attr_getstack( &attr, (void**)&staddr, &stsize );
-#endif
+ g_assert (staddr);
- pthread_attr_destroy (&attr);
+ tls->end_of_stack = staddr + stsize;
- g_assert (staddr);
+ /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
- g_assert ((current > staddr) && (current < staddr + stsize));
+ tls->stack_ovf_guard_base = staddr + mono_pagesize ();
+ tls->stack_ovf_guard_size = mono_pagesize () * 8;
- tls->end_of_stack = staddr + stsize;
+ if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
+ /* mprotect can fail for the main thread stack */
+ 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);
+ g_assert (gaddr == tls->stack_ovf_guard_base);
+ }
/*
* threads created by nptl does not seem to have a guard page, and
* Increasing stsize fools the SIGSEGV signal handler into thinking this
* is a stack overflow exception.
*/
- tls->stack_size = stsize + getpagesize ();
+ tls->stack_size = stsize + mono_pagesize ();
/* Setup an alternate signal stack */
- tls->signal_stack = mmap (0, MONO_ARCH_SIGNAL_STACK_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+ tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
g_assert (tls->signal_stack);
g_assert (err == 0);
if (tls->signal_stack)
- munmap (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
+ mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
+}
+
+#else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
+
+void
+mono_setup_altstack (MonoJitTlsData *tls)
+{
+}
+
+void
+mono_free_altstack (MonoJitTlsData *tls)
+{
}
#endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
+static gboolean
+try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
+{
+ gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
+ /* we need to leave some room for throwing the exception */
+ while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
+ unprotect_size -= mono_pagesize ();
+ /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
+ * is sufficient stack
+ */
+ //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);
+ if (unprotect_size)
+ mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
+ return unprotect_size == jit_tls->stack_ovf_guard_size;
+}
+
+static void
+try_more_restore (void)
+{
+ MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
+ if (try_restore_stack_protection (jit_tls, 500))
+ jit_tls->restore_stack_prot = NULL;
+}
+
+static void
+restore_stack_protection (void)
+{
+ MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
+ MonoException *ex = mono_domain_get ()->stack_overflow_ex;
+ /* if we can't restore the stack protection, keep a callback installed so
+ * we'll try to restore as much stack as we can at each return from unmanaged
+ * code.
+ */
+ if (try_restore_stack_protection (jit_tls, 4096))
+ jit_tls->restore_stack_prot = NULL;
+ else
+ jit_tls->restore_stack_prot = try_more_restore_tramp;
+ /* here we also throw a stack overflow exception */
+ ex->trace_ips = NULL;
+ ex->stack_trace = NULL;
+ mono_raise_exception (ex);
+}
+
+gpointer
+mono_altstack_restore_prot (gssize *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
+{
+ void (*func)(void) = (gpointer)tramp_data;
+ func ();
+ return NULL;
+}
+
+gboolean
+mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
+{
+ /* we got a stack overflow in the soft-guard pages
+ * There are two cases:
+ * 1) managed code caused the overflow: we unprotect the soft-guard page
+ * and let the arch-specific code trigger the exception handling mechanism
+ * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
+ * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
+ * and hope we can continue with those enabled, at least until the hard-guard page
+ * is hit. The alternative to continuing here is to just print a message and abort.
+ * We may add in the future the code to protect the pages again in the codepath
+ * when we return from unmanaged to managed code.
+ */
+ if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
+ fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
+ /* we unprotect the minimum amount we can */
+ guint32 guard_size;
+ gboolean handled = FALSE;
+
+ guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
+ while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
+ guard_size -= mono_pagesize ();
+ }
+ guard_size = jit_tls->stack_ovf_guard_size - guard_size;
+ /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
+ 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);
+#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
+ if (ji) {
+ mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
+ handled = TRUE;
+ }
+#endif
+ if (!handled) {
+ /* We print a message: after this even managed stack overflows
+ * may crash the runtime
+ */
+ fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
+ if (!jit_tls->handling_stack_ovf) {
+ jit_tls->restore_stack_prot = restore_stack_protection_tramp;
+ jit_tls->handling_stack_ovf = 1;
+ } else {
+ /*fprintf (stderr, "Already handling stack overflow\n");*/
+ }
+ }
+ return TRUE;
+ }
+ return FALSE;
+}
+
static gboolean
print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
{
return FALSE;
}
+static G_GNUC_UNUSED gboolean
+print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
+ gpointer data)
+{
+ GString *p = (GString*)data;
+
+ if (method) {
+ gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
+ g_string_append_printf (p, " %s\n", location);
+ g_free (location);
+ } else
+ g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
+
+ return FALSE;
+}
+
static gboolean handling_sigsegv = FALSE;
/*
#ifndef PLATFORM_WIN32
struct sigaction sa;
#endif
+ MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
+
if (handling_sigsegv)
return;
/* To prevent infinite loops when the stack walk causes a crash */
handling_sigsegv = TRUE;
- fprintf (stderr, "Stacktrace:\n\n");
+ /* !jit_tls means the thread was not registered with the runtime */
+ if (jit_tls) {
+ fprintf (stderr, "Stacktrace:\n\n");
- mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
+ mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
- fflush (stderr);
+ fflush (stderr);
+ }
#ifdef HAVE_BACKTRACE_SYMBOLS
{
void *array [256];
char **names;
- char cmd [1024];
int i, size;
- gchar *out, *err;
- gint exit_status;
const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
fprintf (stderr, "\nNative stacktrace:\n\n");
/* Try to get more meaningful information using gdb */
-#ifndef PLATFORM_WIN32
- sprintf (cmd, "gdb --ex 'attach %ld' --ex 'info threads' --ex 'thread apply all bt' --batch", (long)getpid ());
- {
- int res = g_spawn_command_line_sync (cmd, &out, &err, &exit_status, NULL);
+#if !defined(PLATFORM_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
+ if (!mini_get_debug_options ()->no_gdb_backtrace) {
+ /* From g_spawn_command_line_sync () in eglib */
+ int res;
+ int stdout_pipe [2] = { -1, -1 };
+ pid_t pid;
+ const char *argv [16];
+ char buf1 [128];
+ int status;
+ char buffer [1024];
+
+ res = pipe (stdout_pipe);
+ g_assert (res != -1);
+
+ //pid = fork ();
+ /*
+ * glibc fork acquires some locks, so if the crash happened inside malloc/free,
+ * it will deadlock. Call the syscall directly instead.
+ */
+ pid = syscall (SYS_fork);
+ if (pid == 0) {
+ close (stdout_pipe [0]);
+ dup2 (stdout_pipe [1], STDOUT_FILENO);
+
+ for (i = getdtablesize () - 1; i >= 3; i--)
+ close (i);
+
+ argv [0] = g_find_program_in_path ("gdb");
+ if (argv [0] == NULL) {
+ close (STDOUT_FILENO);
+ exit (1);
+ }
- if (res) {
- fprintf (stderr, "\nDebug info from gdb:\n\n");
- fprintf (stderr, "%s\n", out);
+ argv [1] = "-ex";
+ sprintf (buf1, "attach %ld", (long)getpid ());
+ argv [2] = buf1;
+ argv [3] = "--ex";
+ argv [4] = "info threads";
+ argv [5] = "--ex";
+ argv [6] = "thread apply all bt";
+ argv [7] = "--batch";
+ argv [8] = 0;
+
+ execv (argv [0], (char**)argv);
+ exit (1);
}
+
+ close (stdout_pipe [1]);
+
+ fprintf (stderr, "\nDebug info from gdb:\n\n");
+
+ while (1) {
+ int nread = read (stdout_pipe [0], buffer, 1024);
+
+ if (nread <= 0)
+ break;
+ write (STDERR_FILENO, buffer, nread);
+ }
+
+ waitpid (pid, &status, WNOHANG);
}
#endif
/*
* mono_print_thread_dump:
*
* Print information about the current thread to stdout.
+ * SIGCTX can be NULL, allowing this to be called from gdb.
*/
void
mono_print_thread_dump (void *sigctx)
{
MonoThread *thread = mono_thread_current ();
-#ifdef __i386__
+#if defined(__i386__) || defined(__x86_64__)
MonoContext ctx;
#endif
+ GString* text = g_string_new (0);
char *name;
GError *error = NULL;
if (thread->name) {
name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
g_assert (!error);
- fprintf (stdout, "\n\"%s\"", name);
+ g_string_append_printf (text, "\n\"%s\"", name);
g_free (name);
}
else
- fprintf (stdout, "\n\"\"");
+ g_string_append (text, "\n\"\"");
- fprintf (stdout, " tid=0x%p this=0x%p:\n", (gpointer)(gsize)thread->tid, thread);
+ g_string_append_printf (text, " tid=0x%p this=0x%p:\n", (gpointer)(gsize)thread->tid, thread);
/* FIXME: */
-#ifdef __i386__
- mono_arch_sigctx_to_monoctx (sigctx, &ctx);
+#if defined(__i386__) || defined(__x86_64__)
+ if (!sigctx)
+ MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
+ else
+ mono_arch_sigctx_to_monoctx (sigctx, &ctx);
- mono_jit_walk_stack_from_ctx (print_stack_frame, &ctx, TRUE, stdout);
+ mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
#else
printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
#endif
+ fprintf (stdout, text->str);
+ g_string_free (text, TRUE);
fflush (stdout);
}
projects / mono.git / blobdiff