gdb patch take 5

"Jeremy Bettis" <jeremy-PhGaUD7sGqRWk0Htik3J/[email protected]> Mon, 15 Sep 2003 22:06:38 -0500

Newsgroups	gmane.comp.gnu.mingw.patches
Message-ID	<[email protected]>

I sent this from the wrong email address.  It has been submitted to
gdb-patches as well. (maybe)


> * gdb/win32-nat.c
> (handle_exception,get_child_debug_event,_initialize_inftarg) 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.
>
>
> This patch is relative to gdb-5.2.1-1 from mingw.org.
>

gdbpatch.txt (text/plain, 9.4 KB)

--- gdb-5.2.1/gdb/win32-nat.c	Sun Feb 16 16:03:19 2003
+++ gdb-mine/gdb/win32-nat.c	Mon Sep 15 09:57:48 2003
@@ -200,6 +200,7 @@ static int debug_events = 0;		/* show ev
 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 +1025,126 @@ handle_exception (struct target_waitstat
   /* Record the context of the current thread */
   th = thread_rec (current_event.dwThreadId, -1);
 
-  switch (code)
+  if (mapexceptionstosignals)
     {
-    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;
-    }
+	  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;
@@ -1286,6 +1320,7 @@ get_child_debug_event (int pid, struct t
 		     "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 +2007,12 @@ _initialize_inftarg (void)
   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);