gdb exceptions patch
"Jeremy Bettis" <jeremy-PhGaUD7sGqRWk0Htik3J/[email protected]> Tue, 9 Sep 2003 14:55:31 -0500
| Newsgroups | gmane.comp.gnu.mingw.patches |
|---|---|
| Message-ID | <[email protected]> |
When debugging a program that uses windows SEH gdb stops the program even if the inferior's exception handler catches the exception. I have added a new set option, "set mapexceptionstosignals off" that will cause gdb to completely ignore WIN32 exceptions. This is similar to the feature "set signal-exceptions 4" in the Apple Openstep version of gdb 4.15.3. I know that gcc doesn't generate SEH, but I have a 3rd party lib that I am linking against, and it makes it real hard to debug when gdb insists on terminating my process.
gdbpatch.txt
(text/plain, 9.4 KB)
diff -u -r gdb-5.2.1/gdb/win32-nat.c gdb-mine/gdb/win32-nat.c
--- gdb-5.2.1/gdb/win32-nat.c Sun Feb 16 16:03:19 2003
+++ gdb-mine/gdb/win32-nat.c Tue Sep 9 13:38:27 2003
@@ -200,6 +200,7 @@
static int debug_memory = 0; /* show target memory accesses */
static int debug_exceptions = 0; /* show target exceptions */
static int useshell = 0; /* use shell for subprocesses */
+static int mapexceptionstosignals = 1; /* map exceptionstosignals */
/* This vector maps GDB's idea of a register's number into an address
in the win32 exception context vector.
@@ -1024,93 +1025,123 @@
/* Record the context of the current thread */
th = thread_rec (current_event.dwThreadId, -1);
- switch (code)
- {
- case EXCEPTION_ACCESS_VIOLATION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ACCESS_VIOLATION");
- ourstatus->value.sig = TARGET_SIGNAL_SEGV;
- break;
- case STATUS_STACK_OVERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_STACK_OVERFLOW");
- ourstatus->value.sig = TARGET_SIGNAL_SEGV;
- break;
- case STATUS_FLOAT_DENORMAL_OPERAND:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DENORMAL_OPERAND");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ARRAY_BOUNDS_EXCEEDED");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_INEXACT_RESULT:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INEXACT_RESULT");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_INVALID_OPERATION:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INVALID_OPERATION");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_OVERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_OVERFLOW");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_STACK_CHECK:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_STACK_CHECK");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_UNDERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_UNDERFLOW");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_DIVIDE_BY_ZERO:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DIVIDE_BY_ZERO");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_INTEGER_DIVIDE_BY_ZERO:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_DIVIDE_BY_ZERO");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case STATUS_INTEGER_OVERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_OVERFLOW");
- ourstatus->value.sig = TARGET_SIGNAL_FPE;
- break;
- case EXCEPTION_BREAKPOINT:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT");
- ourstatus->value.sig = TARGET_SIGNAL_TRAP;
- break;
- case DBG_CONTROL_C:
- DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C");
- ourstatus->value.sig = TARGET_SIGNAL_INT;
- break;
- case DBG_CONTROL_BREAK:
- DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK");
- ourstatus->value.sig = TARGET_SIGNAL_INT;
- break;
- case EXCEPTION_SINGLE_STEP:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP");
- ourstatus->value.sig = TARGET_SIGNAL_TRAP;
- break;
- case EXCEPTION_ILLEGAL_INSTRUCTION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ILLEGAL_INSTRUCTION");
- ourstatus->value.sig = TARGET_SIGNAL_ILL;
- break;
- case EXCEPTION_PRIV_INSTRUCTION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_PRIV_INSTRUCTION");
- ourstatus->value.sig = TARGET_SIGNAL_ILL;
- break;
- case EXCEPTION_NONCONTINUABLE_EXCEPTION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_NONCONTINUABLE_EXCEPTION");
- ourstatus->value.sig = TARGET_SIGNAL_ILL;
- break;
- default:
- if (current_event.u.Exception.dwFirstChance)
- return 0;
- printf_unfiltered ("gdb: unknown target exception 0x%08lx at 0x%08lx\n",
- current_event.u.Exception.ExceptionRecord.ExceptionCode,
- (DWORD) current_event.u.Exception.ExceptionRecord.ExceptionAddress);
- ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
- break;
- }
+ if (mapexceptionstosignals) {
+ switch (code)
+ {
+ case EXCEPTION_ACCESS_VIOLATION:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ACCESS_VIOLATION");
+ ourstatus->value.sig = TARGET_SIGNAL_SEGV;
+ break;
+ case STATUS_STACK_OVERFLOW:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_STACK_OVERFLOW");
+ ourstatus->value.sig = TARGET_SIGNAL_SEGV;
+ break;
+ case STATUS_FLOAT_DENORMAL_OPERAND:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DENORMAL_OPERAND");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ARRAY_BOUNDS_EXCEEDED");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_FLOAT_INEXACT_RESULT:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INEXACT_RESULT");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_FLOAT_INVALID_OPERATION:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INVALID_OPERATION");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_FLOAT_OVERFLOW:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_OVERFLOW");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_FLOAT_STACK_CHECK:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_STACK_CHECK");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_FLOAT_UNDERFLOW:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_UNDERFLOW");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_FLOAT_DIVIDE_BY_ZERO:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DIVIDE_BY_ZERO");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_INTEGER_DIVIDE_BY_ZERO:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_DIVIDE_BY_ZERO");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case STATUS_INTEGER_OVERFLOW:
+ DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_OVERFLOW");
+ ourstatus->value.sig = TARGET_SIGNAL_FPE;
+ break;
+ case EXCEPTION_BREAKPOINT:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT");
+ ourstatus->value.sig = TARGET_SIGNAL_TRAP;
+ break;
+ case DBG_CONTROL_C:
+ DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C");
+ ourstatus->value.sig = TARGET_SIGNAL_INT;
+ break;
+ case DBG_CONTROL_BREAK:
+ DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK");
+ ourstatus->value.sig = TARGET_SIGNAL_INT;
+ break;
+ case EXCEPTION_SINGLE_STEP:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP");
+ ourstatus->value.sig = TARGET_SIGNAL_TRAP;
+ break;
+ case EXCEPTION_ILLEGAL_INSTRUCTION:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ILLEGAL_INSTRUCTION");
+ ourstatus->value.sig = TARGET_SIGNAL_ILL;
+ break;
+ case EXCEPTION_PRIV_INSTRUCTION:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_PRIV_INSTRUCTION");
+ ourstatus->value.sig = TARGET_SIGNAL_ILL;
+ break;
+ case EXCEPTION_NONCONTINUABLE_EXCEPTION:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_NONCONTINUABLE_EXCEPTION");
+ ourstatus->value.sig = TARGET_SIGNAL_ILL;
+ break;
+ default:
+ if (current_event.u.Exception.dwFirstChance)
+ return 0;
+ printf_unfiltered ("gdb: unknown target exception 0x%08lx at 0x%08lx\n",
+ current_event.u.Exception.ExceptionRecord.ExceptionCode,
+ (DWORD) current_event.u.Exception.ExceptionRecord.ExceptionAddress);
+ ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+ break;
+ }
+ } else {
+ switch (code)
+ {
+ case EXCEPTION_BREAKPOINT:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT");
+ ourstatus->value.sig = TARGET_SIGNAL_TRAP;
+ break;
+ case DBG_CONTROL_C:
+ DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C");
+ ourstatus->value.sig = TARGET_SIGNAL_INT;
+ break;
+ case DBG_CONTROL_BREAK:
+ DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK");
+ ourstatus->value.sig = TARGET_SIGNAL_INT;
+ break;
+ case EXCEPTION_SINGLE_STEP:
+ DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP");
+ ourstatus->value.sig = TARGET_SIGNAL_TRAP;
+ break;
+ default:
+ if (current_event.u.Exception.dwFirstChance)
+ return 0;
+ printf_unfiltered ("gdb: unknown target exception 0x%08lx at 0x%08lx\n",
+ current_event.u.Exception.ExceptionRecord.ExceptionCode,
+ (DWORD) current_event.u.Exception.ExceptionRecord.ExceptionAddress);
+ ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+ break;
+ }
+ }
exception_count++;
last_sig = ourstatus->value.sig;
return 1;
@@ -1172,6 +1203,7 @@
thread_info *th = NULL;
static thread_info dummy_thread_info;
int retval = 0;
last_sig = TARGET_SIGNAL_0;
@@ -1286,6 +1318,7 @@
"EXCEPTION_DEBUG_EVENT"));
if (saw_create != 1)
break;
+ continue_status=DBG_EXCEPTION_NOT_HANDLED ;
if (handle_exception (ourstatus))
retval = current_event.dwThreadId;
break;
@@ -1972,6 +2005,12 @@
add_show_from_set (add_set_cmd ("debugexceptions", class_support, var_boolean,
(char *) &debug_exceptions,
"Set whether to display kernel exceptions in child process.",
+ &setlist),
+ &showlist);
+
+ add_show_from_set (add_set_cmd ("mapexceptionstosignals", class_support, var_boolean,
+ (char *) &mapexceptionstosignals,
+ "Set whether to convert WIN32 exceptions to gdb signals.",
&setlist),
&showlist);