I've simplified the _eh_handler_ in src/newlib/newlib/libc/sys/wince/startup.c a bit, see attachment.
This kicks out all the complicated handling in that function, and
replaces it with a simple message box.
The downside is that the original (complicated) stuff is gone. I have no
idea whether this actually worked.
Is replacing this a good idea ?
My test programs now show a dialog titled "WinCE Exception" and
containing text such as
ILLEGAL_INSTRUCTION
Code C000001D
Flags 0
(that's the test program that performs a floating point instruction for
floating point hardware which isn't on my system), or
ACCESS_VIOLATION
Code C0000005
Flags 0
when trying to access a NULL pointer.
Strangely, dividing by 0 doesn't cause such an exception.
I haven't tried this in mingw32ce yet, only in cegcc.
Opinions ?
Danny
--
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
Index: startup.c
===================================================================
--- startup.c (revision 915)
+++ startup.c (working copy)
@@ -13,6 +13,11 @@
#include "sys/io.h"
#include "sys/fixpath.h"
+static struct exception_txt {
+ int v;
+ wchar_t *s;
+} exception_txt[];
+
void
_start_process(wchar_t *exe, wchar_t *cmd)
{
@@ -95,12 +100,33 @@
// called from startup-stub.c
+#if 1
EXCEPTION_DISPOSITION
_eh_handler_(struct _EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame,
struct _CONTEXT *ContextRecord,
struct _DISPATCHER_CONTEXT *DispatcherContext)
{
+ wchar_t msg[256];
+ int i;
+
+ for (i=0; exception_txt[i].s; i++)
+ if (exception_txt[i].v == ExceptionRecord->ExceptionCode) {
+ wsprintf(msg, L"%s\r\nCode %X\r\nFlags %X",
+ exception_txt[i].s,
+ ExceptionRecord->ExceptionCode,
+ ExceptionRecord->ExceptionFlags);
+ }
+ MessageBoxW(0, msg, L"WinCE Exception", 0);
+ exit(1);
+}
+#else
+EXCEPTION_DISPOSITION
+_eh_handler_(struct _EXCEPTION_RECORD *ExceptionRecord,
+ void *EstablisherFrame,
+ struct _CONTEXT *ContextRecord,
+ struct _DISPATCHER_CONTEXT *DispatcherContext)
+{
// ### What is this needed for?
static int NestedException=0;
if(NestedException)
@@ -230,6 +256,7 @@
printf("Signal handler returned!\n");
exit(1);
}
+#endif
void _parse_tokens(char * string, char * tokens[]);
@@ -577,3 +604,50 @@
}
__argc = index;
}
+
+/*
+ * Table with exception strings, stolen from sys/oldsys/wcekernel.h
+ */
+
+/* Definitions and structs for Kernel Exceptions and handling */
+static struct exception_txt exception_txt[] = {
+// { STATUS_SUCCESS, L"SUCCESS" },
+// { STATUS_UNSUCCESSFUL, L"UNSUCCESSFUL" },
+ { STATUS_WAIT_0, L"WAIT_0" },
+ { STATUS_ABANDONED_WAIT_0, L"ABANDONED_WAIT_0" },
+ { STATUS_USER_APC, L"USER_APC" },
+ { STATUS_TIMEOUT, L"TIMEOUT" },
+ { STATUS_PENDING, L"PENDING" },
+ { STATUS_SEGMENT_NOTIFICATION, L"SEGMENT_NOTIFICATION" },
+ { STATUS_GUARD_PAGE_VIOLATION, L"GUARD_PAGE_VIOLATION" },
+ { STATUS_DATATYPE_MISALIGNMENT, L"DATATYPE_MISALIGNMENT" },
+ { STATUS_BREAKPOINT, L"BREAKPOINT" },
+ { STATUS_SINGLE_STEP, L"SINGLE_STEP" },
+ { STATUS_ACCESS_VIOLATION, L"ACCESS_VIOLATION" },
+ { STATUS_IN_PAGE_ERROR, L"IN_PAGE_ERROR" },
+ { STATUS_INVALID_HANDLE, L"INVALID_HANDLE" },
+// { STATUS_INVALID_PARAMETER, L"INVALID_PARAMETER" },
+ { STATUS_NO_MEMORY, L"NO_MEMORY" },
+// { STATUS_INVALID_SYSTEM_SERVICE, L"INVALID_SYSTEM_SERVICE" },
+ { STATUS_ILLEGAL_INSTRUCTION, L"ILLEGAL_INSTRUCTION" },
+ { STATUS_NONCONTINUABLE_EXCEPTION, L"NONCONTINUABLE_EXCEPTION" },
+ { STATUS_INVALID_DISPOSITION, L"INVALID_DISPOSITION" },
+ { STATUS_ARRAY_BOUNDS_EXCEEDED, L"ARRAY_BOUNDS_EXCEEDED" },
+ { STATUS_FLOAT_DENORMAL_OPERAND, L"FLOAT_DENORMAL_OPERAND" },
+ { STATUS_FLOAT_DIVIDE_BY_ZERO, L"FLOAT_DIVIDE_BY_ZERO" },
+ { STATUS_FLOAT_INEXACT_RESULT, L"FLOAT_INEXACT_RESULT" },
+ { STATUS_FLOAT_INVALID_OPERATION, L"FLOAT_INVALID_OPERATION" },
+ { STATUS_FLOAT_OVERFLOW, L"FLOAT_OVERFLOW" },
+ { STATUS_FLOAT_STACK_CHECK, L"FLOAT_STACK_CHECK" },
+ { STATUS_FLOAT_UNDERFLOW, L"FLOAT_UNDERFLOW" },
+ { STATUS_INTEGER_DIVIDE_BY_ZERO, L"INTEGER_DIVIDE_BY_ZERO" },
+ { STATUS_INTEGER_OVERFLOW, L"INTEGER_OVERFLOW" },
+ { STATUS_PRIVILEGED_INSTRUCTION, L"PRIVILEGED_INSTRUCTION" },
+ { STATUS_STACK_OVERFLOW, L"STACK_OVERFLOW" },
+// { STATUS_USER_BREAK, L"USER_BREAK" },
+ { STATUS_CONTROL_C_EXIT, L"CONTROL_C_EXIT" },
+// { STATUS_FLOAT_MULTIPLE_FAULTS, L"FLOAT_MULTIPLE_FAULTS" },
+// { STATUS_FLOAT_MULTIPLE_TRAPS, L"FLOAT_MULTIPLE_TRAPS" },
+// { STATUS_ILLEGAL_VLM_REFERENCE, L"ILLEGAL_VLM_REFERENCE" },
+ { 0, 0 }
+};
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