Re: Fixed strace [ was Re: ls -l is broken ]
On Wed, May 06, 2009 at 12:04:42PM -0400, Kyle McMartin wrote:
> 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?
Wouldn't 1e == bit 30?
And yes, "depwi 0,31,2,XX" is clearing the bottom 2 bits of XX.
I'm a bit confused about the ">=" conditional since only one bit is tested.
So is the copy only executed on branch not taken case?