#include <signal.h>
#include <string.h>
+#ifdef HAVE_EXECINFO_H
+#include <execinfo.h>
+#endif
+
#include <mono/metadata/appdomain.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/threads.h>
#include "mini.h"
+#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
+#include <unistd.h>
+#include <sys/mman.h>
+#endif
+
#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)))
#ifndef MONO_ARCH_CONTEXT_DEF
#ifndef CUSTOM_EXCEPTION_HANDLING
/**
- * mono_handle_exception:
+ * mono_handle_exception_internal:
* @ctx: saved processor state
* @obj: the exception object
* @test_only: only test if the exception is caught, but dont call handlers
- *
+ * @out_filter_idx: out parameter. if test_only is true, set to the index of
+ * the first filter clause which caught the exception.
*/
-gboolean
-mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
+static gboolean
+mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gint32 *out_filter_idx)
{
MonoDomain *domain = mono_domain_get ();
MonoJitInfo *ji, rji;
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
MonoContext ctx_cp = *ctx;
if (mono_jit_trace_calls != NULL)
g_print ("EXCEPTION handling: %s\n", mono_object_class (obj)->name);
- if (!mono_handle_exception (&ctx_cp, obj, original_ip, TRUE)) {
+ if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, &first_filter_idx)) {
if (mono_break_on_exc)
G_BREAKPOINT ();
mono_unhandled_exception (obj);
}
}
+ if (out_filter_idx)
+ *out_filter_idx = -1;
+ filter_idx = 0;
initial_ctx = *ctx;
memset (&rji, 0, sizeof (rji));
if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
/* store the exception object in cfg->excvar */
g_assert (ei->exvar_offset);
- *((gpointer *)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
+ *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
}
if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
// mono_debugger_handle_exception (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
- filtered = call_filter (ctx, ei->data.filter);
+ if (test_only) {
+ filtered = call_filter (ctx, ei->data.filter);
+ if (filtered && out_filter_idx)
+ *out_filter_idx = filter_idx;
+ }
+ else {
+ /*
+ * Filter clauses should only be run in the
+ * first pass of exception handling.
+ */
+ filtered = (filter_idx == first_filter_idx);
+ }
+ filter_idx ++;
}
if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
*ctx = new_ctx;
- if ((ji == (gpointer)-1) || MONO_CONTEXT_GET_BP (ctx) >= jit_tls->end_of_stack) {
+ if (ji == (gpointer)-1) {
if (gc_disabled)
mono_gc_enable ();
if (IS_ON_SIGALTSTACK (jit_tls)) {
/* Switch back to normal stack */
- if (stack_overflow)
+ if (stack_overflow) {
/* Free up some stack space */
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);
+ }
MONO_CONTEXT_SET_IP (&initial_ctx, (gssize)jit_tls->abort_func);
restore_context (&initial_ctx);
}
g_assert_not_reached ();
}
-#endif /* CUSTOM_EXECPTION_HANDLING */
+/**
+ * mono_debugger_run_finally:
+ * @start_ctx: saved processor state
+ *
+ * This method is called by the Mono Debugger to call all `finally' clauses of the
+ * current stack frame. It's used when the user issues a `return' command to make
+ * the current stack frame return. After returning from this method, the debugger
+ * unwinds the stack one frame and gives control back to the user.
+ *
+ * NOTE: This method is only used when running inside the Mono Debugger.
+ */
+void
+mono_debugger_run_finally (MonoContext *start_ctx)
+{
+ static int (*call_filter) (MonoContext *, gpointer) = NULL;
+ MonoDomain *domain = mono_domain_get ();
+ MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
+ MonoLMF *lmf = jit_tls->lmf;
+ MonoContext ctx, new_ctx;
+ MonoJitInfo *ji, rji;
+ int i;
+
+ ctx = *start_ctx;
+
+ ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
+ if (!ji || ji == (gpointer)-1)
+ return;
+
+ if (!call_filter)
+ call_filter = mono_arch_get_call_filter ();
+
+ for (i = 0; i < ji->num_clauses; i++) {
+ MonoJitExceptionInfo *ei = &ji->clauses [i];
+
+ if ((ei->try_start <= MONO_CONTEXT_GET_IP (&ctx)) &&
+ (MONO_CONTEXT_GET_IP (&ctx) < ei->try_end) &&
+ (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
+ call_filter (&ctx, ei->handler_start);
+ }
+ }
+}
+
+/**
+ * mono_handle_exception:
+ * @ctx: saved processor state
+ * @obj: the exception object
+ * @test_only: only test if the exception is caught, but dont call handlers
+ */
+gboolean
+mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
+{
+ return mono_handle_exception_internal (ctx, obj, original_ip, test_only, NULL);
+}
+
+#endif /* CUSTOM_EXCEPTION_HANDLING */
+
+#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
+
+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
+#ifndef sun
+ pthread_attr_getstack( &attr, (void**)&staddr, &stsize );
+#endif
+
+ g_assert (staddr);
+
+ g_assert ((current > staddr) && (current < staddr + stsize));
+
+ tls->end_of_stack = staddr + stsize;
+
+ /*
+ * threads created by nptl does not seem to have a guard page, and
+ * since the main thread is not created by us, we can't even set one.
+ * Increasing stsize fools the SIGSEGV signal handler into thinking this
+ * is a stack overflow exception.
+ */
+ tls->stack_size = stsize + getpagesize ();
+
+ /* 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_size = MONO_ARCH_SIGNAL_STACK_SIZE;
+
+ g_assert (tls->signal_stack);
+
+ sa.ss_sp = tls->signal_stack;
+ sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
+ sa.ss_flags = SS_ONSTACK;
+ sigaltstack (&sa, NULL);
+}
+
+void
+mono_free_altstack (MonoJitTlsData *tls)
+{
+ struct sigaltstack sa;
+ int err;
+
+ sa.ss_sp = tls->signal_stack;
+ sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
+ sa.ss_flags = SS_DISABLE;
+ err = sigaltstack (&sa, NULL);
+ g_assert (err == 0);
+
+ if (tls->signal_stack)
+ munmap (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
+}
+
+#endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
+
+static gboolean
+print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
+{
+ if (method) {
+ if (il_offset != -1)
+ fprintf (stderr, "in [0x%lx] %s\n", (long)il_offset, mono_method_full_name (method, TRUE));
+ else
+ fprintf (stderr, "in <0x%lx> %s\n", (long)native_offset, mono_method_full_name (method, TRUE));
+ } else
+ fprintf (stderr, "in <%lx> <unknown>\n", (long)native_offset);
+
+ return FALSE;
+}
+
+/*
+ * mono_handle_native_sigsegv:
+ *
+ * Handle a SIGSEGV received while in native code by printing diagnostic
+ * information and aborting.
+ */
+void
+mono_handle_native_sigsegv (void *ctx)
+{
+ /*
+ * A SIGSEGV indicates something went very wrong so we can no longer depend
+ * on anything working. So try to print out lots of diagnostics, starting
+ * with ones which have a greater change of working.
+ */
+ fprintf (stderr,
+ "\n"
+ "=================================================================\n"
+ "Got a SIGSEGV while executing native code. This usually indicates\n"
+ "a fatal error in the mono runtime or one of the native libraries \n"
+ "used by your application.\n"
+ "=================================================================\n"
+ "\n");
+
+ fprintf (stderr, "Stacktrace:\n\n");
+
+ mono_jit_walk_stack (print_stack_frame, TRUE, NULL);
+
+ fflush (stderr);
+
+#ifdef HAVE_BACKTRACE_SYMBOLS
+ {
+ void *array [256];
+ char **names;
+ int i, size;
+
+ fprintf (stderr, "\nNative stacktrace:\n\n");
+
+ size = backtrace (array, 256);
+ names = backtrace_symbols (array, size);
+ for (i =0; i < size; ++i) {
+ fprintf (stderr, "\t%s\n", names [i]);
+ }
+ free (names);
+ }
+
+ fflush (stderr);
+#endif
+
+ abort ();
+}
projects / mono.git / blobdiff