On Mon, 2007-07-02 at 00:38 +0100, Pedro Alves wrote:
> Kevin O'Connor escreveu:
> > On Sun, Jul 01, 2007 at 08:12:33PM +0100, Pedro Alves wrote:
> >> Danny Backx wrote:
> >>> void Handle(struct _EXCEPTION_RECORD *ExceptionRecord,
> >>> void *EstablisherFrame,
> >>> struct _CONTEXT *ContextRecord,
> >>> struct _DISPATCHER_CONTEXT *DispatcherContext)
> >>> {
> >>> throw WindowsException(ExceptionRecord, EstablisherFrame,
> >>> ContextRecord, DispatcherContext);
> >>> }
> >> I'm not sure that is safe. You are throwing away from a callback started
> >> from the kernel. I think the safest is to tweak the current threads
> >> context with GetThreaContext/SetThreadContext to point the pc at a
> >> different
> >> address like your registered handler, and return
> >> EXCEPTION_CONTINUE_EXECUTION. Then, in that handler, you're got the stack
> >> setup as if the exception called directly into your handler, and it should
> >> be
> >> safe to throw a c++ exception. Take another look at cegcc's startup.c for
> >> inspiration - It already does something similar.
> >
> > Is it safe to enter an exception handler using the calling program's
> > stack? That is, if you set the pc to a handler and call
> > EXCEPTION_CONTINUE_EXECUTION that handler will alter the stack and
> > registers of the function that raised the exception. Are we
> > guarenteed that this is okay?
> >
>
> Of course, just changing the pc is not enough. We have to setup a
> new stack frame. Really, you should look at newlib/libc/sys/wince/startup.c:
[...]
> __eh_continue is implemented in asm.
>
> Let me see if I can come up with something in the following days.
I am working on this type of stuff but it's unfinished. I didn't mail
that the other day because I wanted to show something like the end
result, knowing full well that none of the details are done yet.
All opinions on how this should work are very welcome though.
Shall I put this in a branch in SVN so you can track what I'm doing?
Danny
--
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
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