[Bug target/85044] ENDBR is missing in ix86_trampoline_init

[hjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85044

--- Comment #3 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Tue Mar 27 17:18:51 2018
New Revision: 258897

URL: https://gcc.gnu.org/viewcvs?rev=258897&root=gcc&view=rev
Log:
i386: Insert ENDBR to trampoline for -fcf-protection=branch -mibt

When -fcf-protection=branch -mibt are used, we need to insert ENDBR
to trampoline.  TRAMPOLINE_SIZE is creased by 4 bytes to accommodate
4-byte ENDBR instruction.

gcc/

        PR target/85044
        * config/i386/i386.c (ix86_trampoline_init): Insert ENDBR for
        -fcf-protection=branch -mibt.
        * config/i386/i386.h (TRAMPOLINE_SIZE): Increased by 4 bytes.

gcc/testsuite/

        PR target/85044
        * gcc.target/i386/pr85044.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr85044.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.h
    trunk/gcc/testsuite/ChangeLog