[Bug target/96350] [cet] For ENDBR immediate, the binary would include a gadget that starts with a fake ENDBR64 opcode.

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96350

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>:

https://gcc.gnu.org/g:9a5381f749ee2cef51af67895de182113e45f642

commit r11-2716-g9a5381f749ee2cef51af67895de182113e45f642
Author: liuhongt <hongtao....@intel.com>
Date:   Tue Aug 4 10:00:13 2020 +0800

    Force ENDBR immediate into memory.

    gcc/
            PR target/96350
            * config/i386/i386.c (ix86_legitimate_constant_p): Return
            false for ENDBR immediate.
            (ix86_legitimate_address_p): Ditto.
            * config/i386/predicates.md
            (x86_64_immediate_operand): Exclude ENDBR immediate.
            (x86_64_zext_immediate_operand): Ditto.
            (x86_64_dwzext_immediate_operand): Ditto.
            (ix86_endbr_immediate_operand): New predicate.

    gcc/testsuite
            * gcc.target/i386/endbr_immediate.c: New test.