Re: [PATCH 2/2] aarch64: implement walking over the stack protector

[Andrew Pinski <pinskia@gmail.com>]

On Thu, Jun 5, 2014 at 1:06 PM, Kyle McMartin <kmcmarti@redhat.com> wrote:
> On Tue, Jun 03, 2014 at 10:51:08AM -0400, Kyle McMartin wrote:
>> On Mon, Jun 02, 2014 at 10:42:32PM -0700, Andrew Pinski wrote:
>> > > +    adrp x0, __stack_chk_guard
>> > > +    add  x0, x0, #:lo12:__stack_chk_guard
>> > > +    ldr  x0, [x0]
>> > > +    str  x0, [x29, #end-of-stack]
>> >
>> > Can you expand this for ILP32?  The sequence is the same except to use
>> > w0 instead of x0.  Otherwise I can put it on my todo list to after I
>> > submit the gdb support for ILP32.
>> >
>>
>> I'll look into it. Thanks Andrew.
>>
>
> Finally got a toolchain built that supports ilp32... looks like the
> existing code should work for it. The only difference (not sure if it's
> because of gcc HEAD or what) is using w1 instead of x0 repeated for the
> ldr/str, which looks to be satisfied by the rt/rt2 tests and size=10
> included in the decode_masked_match. I'll try to build a static ilp32
> binary to test it meanwhile, but I've had some other issues with gcc
> HEAD.

Glibc support is not there yet though.  I will take over the issue
with ILP32 then.  When this goes in, can you file a bug and assign it
to me (pinskia@gcc.gnu.org I think is my email for sourceware
bugzilla)?

Thanks,
Andrew Pinski


>
> regards, Kyle