On Tue, Jan 30, 2018 at 3:19 PM, Tsimbalist, Igor V
<igor.v.tsimbal...@intel.com> wrote:
> x32 is a 64-bit process with 32-bit software pointer and kernel may
> place x32 shadow stack above 4GB. We need to save and restore 64-bit
> shadow stack register for x32. builtin jmp buf size is 5 pointers. We
> have space to save 64-bit shadow stack pointer: 32-bit SP, 32-bit FP,
> 32-bit IP, 64-bit SSP for x32.
>
> PR target/84066
> * gcc/config/i386/i386.md: Replace Pmode with word_mode in
> builtin_setjmp_setup and builtin_longjmp to support x32.
> * gcc/testsuite/gcc.target/i386/cet-sjlj-6.c: New test.
>
> Ok for trunk?
LGTM, but please check the testcase with -mx32
-maddress-mode={short,long} nevertheless to catch any incosistencies.
Thanks,
Uros.
