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Re: Fix ____longjmp_chk for ppc(64)
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.
Which mr - the one Jakub quoted above or the one in
__longjmp-common.S? IIUC the CFI doesn't attach to the mr
in the above, but to the following instruction. So I don't understand
why the nop is required.
--
Daniel Jacobowitz
CodeSourcery