3.0: unwinder changes

Tue Jun 12 10:51:00 GMT 2001

On Wed, 6 Jun 2001, Andrew Haley wrote:
> The critical file is config/sparc/linux.h, where we need to define
> MD_FALLBACK_FRAME_STATE_FOR.

Thanks. I meant to say sparc/solaris, actually.
I'm finding sparc-signal.h is badly broken. While attempting to fix
it, I ran into the problem with leaf functions just as you did:
http://gcc.gnu.org/ml/gcc-patches/2001-05/msg00961.html
So sparc-solaris must have MD_FALLBACK_FRAME_STATE_FOR or there is no
chance of passing the testsuite, I guess... darn.
> This routine is basically just a
> structure copy, copying each register from the save area in the
> sigcontext left by the kernel to the frame state in the unwinder.
> There are already examples for PPC, x86, and Alpha.

Ugh. These macros seem to rely on special knowledge of the undocumented
sigreturn call. It's not obvious to me how I get from an
_Unwind_Context to a struct ucontext on a non-linux OS.
I'd guess this is important for 3.0, but the countdown is running and I
cannot do anything more at the moment :(
Jeff