[Bug target/84066] Wrong shadow stack register size is saved for x32

[itsimbal at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84066

--- Comment #8 from itsimbal at gcc dot gnu.org ---
Author: itsimbal
Date: Fri Feb  2 10:06:39 2018
New Revision: 257326

URL: https://gcc.gnu.org/viewcvs?rev=257326&root=gcc&view=rev
Log:
PR84066 Wrong shadow stack register size is saved for x32

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 pointers: 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-6a.c: New test.
        * gcc/testsuite/gcc.target/i386/cet-sjlj-6b.c: Likewise.


Added:
    trunk/gcc/testsuite/gcc.target/i386/cet-sjlj-6a.c
    trunk/gcc/testsuite/gcc.target/i386/cet-sjlj-6b.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md
    trunk/gcc/testsuite/ChangeLog