Danny Backx wrote:
> 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.
>
You're removing functionality. That function does a few things (there
are some log dumps that could 'go away'/'be ifdefs out'):
- converts unaligned accesses to memcpy's. Questionable if this adds any
real value. Unaligned accesses should be fixed on the code that produces
them. Having a handler fix them hides a "bug", and makes programs run
slow.
- implements very rudimentary support for SIGSEGV.
> The downside is that the original (complicated) stuff is gone. I have no
> idea whether this actually worked.
>
It does. At least it did many months ago.
> 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.
>
Should cegcc apps really display dialogs like that? Maybe
they should do an fprintf (stderr, ...) instead. I'm thinking
of cegcc console apps over a telnet/ssh for instance.
> Strangely, dividing by 0 doesn't cause such an exception.
>
Are you sure the compiler didn't optimize the division into nan
or something else?
Try looking at the asm, building without optimization or
do something like:
int main (int argc, char** argv)
{
return 5/(argc - 1);
}
> I haven't tried this in mingw32ce yet, only in cegcc.
>
The user should do it himself if he wants it in mingw32ce?
(Any brave soul to implement proper ARM WinCE SEH
support on gcc ?)
Cheers,
Pedro Alves
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