Fix ____longjmp_chk for ppc(64)

[Richard Henderson]

On 06/24/2009 10:55 AM, Jakub Jelinek wrote:
> On Wed, Jun 24, 2009 at 10:28:39AM -0700, Richard Henderson wrote:
>> On 06/24/2009 10:15 AM, Jakub Jelinek wrote:
>>>    	bl	HIDDEN_JUMPTARGET (__fortify_fail);	\
>>>    .Lok:							\
>>> 	mr	r1, reg;				\
>>> +	cfi_adjust_cfa_offset (-112);			\
>>> +	cfi_same_value (lr)
>>>
>>> and remove the mr r1, r14 resp. mr r1, r22 from __longjmp-common.S?
>>> Then you don't need to add any extra insn.
>> The cfa is incorrect for the duration of the mr r1 insn.
>
> Ah, but in that case can't be the cfi directives be right after bl?
> The unwinders subtract one when looking for which cfi directives to apply,
> unless in signal frame:

Um... Yes, I think they can.  I thought I remembered
something odd about noreturn functions, but perhaps
that was end-of-function calls interacting with the
following function.


r~