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[i386] PR81842 [CET] -fcf-protection -mcet is incompatible with makecontext family functions

From: "Tsimbalist, Igor V" <igor dot v dot tsimbalist at intel dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Uros Bizjak <ubizjak at gmail dot com>, "Tsimbalist, Igor V" <igor dot v dot tsimbalist at intel dot com>
Date: Mon, 18 Dec 2017 00:05:15 +0000
Subject: [i386] PR81842 [CET] -fcf-protection -mcet is incompatible with makecontext family functions
Authentication-results: sourceware.org; auth=none
Dlp-product: dlpe-windows
Dlp-reaction: no-action
Dlp-version: 11.0.0.116

-fcf-protection -mcet is incompatible with makecontext family functions
since they can't properly set up and destroy shadow stack pointer. This
change provides a mechanism to help detection shadow stack compatibility.
The current proposal is to add -mcheck-shstk-compat option which will
predefine __CHECK_SHSTK_COMPAT__ macro. The option will be
set on by default.  Then we can add a code

#if defined __SHSTK__ && defined __CHECK_SHSTK_COMPAT__
# error This source is incompatible with -mshstk
#endif

to <ucontext.h>.

Ok for trunk?

Igor

Attachment: 0001-Add-mcheck-shstk-compat.patch
Description: 0001-Add-mcheck-shstk-compat.patch

Follow-Ups:
- Re: [i386] PR81842 [CET] -fcf-protection -mcet is incompatible with makecontext family functions
  - From: Sandra Loosemore

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