> On Tue, May 05, 2009 at 03:46:57PM -0400, John David Anglin wrote: > > > On Tue, May 05, 2009 at 03:09:50PM -0400, John David Anglin wrote: > > > > Probably, the cast should be to int. __canonicalize_funcptr_for_compare > > > > isn't used in the 64-bit runtime. > > > > > > > > Still, I'm not sure why this fixed the problem as > > > > __canonicalize_funcptr_for_compare checks for -1. > > > > > > > > > > If we cast both sides to int, then we don't generate a call there... > > > > That will certainly fix the problem but I'd really like to know > > why we get a segv. I suspect we are not handling a deferred function > > pointer correctly. > > > > At a guess, you're probably right, the faulting insn is a load: > > 0x0002b3a8 <__canonicalize_funcptr_for_compare+48>: bb,>= r26,1e,0x2b394 <__canonicalize_funcptr_for_compare+28> > 0x0002b3ac <__canonicalize_funcptr_for_compare+52>: copy r26,r3 > 0x0002b3b0 <__canonicalize_funcptr_for_compare+56>: addil L%800,dp,r1 > 0x0002b3b4 <__canonicalize_funcptr_for_compare+60>: ldw 294(r1),ret1 > 0x0002b3b8 <__canonicalize_funcptr_for_compare+64>: depwi 0,31,2,r3 > 0x0002b3bc <__canonicalize_funcptr_for_compare+68>: ldw 0(r3),r26 > > god knows I can't recall how DEP*I work, but I guess this is clearing > the bottom two bits of %r3 if bit 31 is set in %r26? > > (gdb) p/x $r3 > $3 = 0x407d2f18 > (gdb) p/x $r26 > $4 = 0x407d2f1a > > This looks like the sigaction handler, (it appears __canon..._compare > detects -1 already.) This all seems correct. r3 should be pointing to a function descriptor for the sigaction handler (plabel bit is set). What is the interruption generated by the ldw at 0x0002b3bc? Dave -- J. David Anglin dave.anglin@xxxxxxxxxxxxxx National Research Council of Canada (613) 990-0752 (FAX: 952-6602) -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
