3.0: unwinder changes

Tue Jun 12 12:51:00 GMT 2001

On 2001年6月12日, Andrew Haley wrote:
> > So sparc-solaris must have MD_FALLBACK_FRAME_STATE_FOR or there is no
> > chance of passing the testsuite, I guess... darn.
>> Yes, this is a consequence of the new EH structure. sparc-signal.h is
> way out of date.

Frankly I don't understand how it ever worked:
 register int retaddr = _context->uc_mcontext.gregs[REG_O7];
%o7 has the return address after a call insn, but it doesn't seem to point
to the faulting instruction in a signal handler.
Using this instead almost fixes the problem:
 register int retaddr = _context->uc_mcontext.gregs[REG_PC] - 4;
> You may find that sparc/solaris works in very much the same way as
> Linux. I think it did the last time I looked.

There is no sigreturn in Solaris. Certainly there is some equivalent,
but, umm... let me just say I'm learning far more about sparc-solaris
than I bargained for.
Avoidance of signal handlers is partly what made me a java advocate in the
first place ;)
> I don't think that this can possibly happen. 3.0 is near-frozen.

Yep. Mark is proposing frequent releases from here on, which makes the
3.0 release more tolerable for me.
Jeff