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x86: Update __CET__ check

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__CET__ has been changed by revision 259522:

commit d59cfa9a40
Author: hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Fri Apr 20 13:30:13 2018 +0000

    Define __CET__ for -fcf-protection and remove -mibt

to

    (__CET__ & 1) != 0: -fcf-protection=branch or -fcf-protection=full
    (__CET__ & 2) != 0: -fcf-protection=return or -fcf-protection=full

We should check (__CET__ & 2) != 0 for shadow stack.

libgcc/

	* config/i386/linux-unwind.h: Add (__CET__ & 2) != 0 check
	when including "config/i386/shadow-stack-unwind.h".

libitm/

	* config/x86/sjlj.S (_ITM_beginTransaction): Add
	(__CET__ & 2) != 0 check for shadow stack.
	(GTM_longjmp): Likewise.

From-SVN: r259621
This commit is contained in:
H.J. Lu 2018-04-24 22:15:51 +00:00 committed by H.J. Lu
parent e59133c36c
commit ffc2fc06e3
4 changed files with 16 additions and 5 deletions
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5
libgcc/ChangeLog
View File

@ -1,3 +1,8 @@
2018-04-24 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/linux-unwind.h: Add (__CET__ & 2) != 0 check
when including "config/i386/shadow-stack-unwind.h".
2018-04-24 H.J. Lu <hongjiu.lu@intel.com>
* configure: Regenerated.

2
libgcc/config/i386/linux-unwind.h
View File

@ -23,7 +23,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Unwind shadow stack for -fcf-protection -mshstk. */
#if defined __SHSTK__ && defined __CET__
#if defined __SHSTK__ && defined __CET__ && (__CET__ & 2) != 0
# include "config/i386/shadow-stack-unwind.h"
#endif

6
libitm/ChangeLog
View File

@ -1,3 +1,9 @@
2018-04-24 H.J. Lu <hongjiu.lu@intel.com>
* config/x86/sjlj.S (_ITM_beginTransaction): Add
(__CET__ & 2) != 0 check for shadow stack.
(GTM_longjmp): Likewise.
2018-04-24 H.J. Lu <hongjiu.lu@intel.com>
* configure: Regenerated.

8
libitm/config/x86/sjlj.S
View File

@ -141,7 +141,7 @@ SYM(_ITM_beginTransaction):
movq %r15, -24(%rax)
xorq %rdx, %rdx
/* Save zero or shadow stack pointer in the new field. */
#if defined(__SHSTK__) && defined(__CET__)
#if defined __SHSTK__ && defined __CET__ && (__CET__ & 2) != 0
rdsspq %rdx
#endif
movq %rdx, -16(%rax)
@ -177,7 +177,7 @@ SYM(_ITM_beginTransaction):
movl %ebp, 20(%esp)
xorl %edx, %edx
/* Save zero or shadow stack pointer in the new field. */
#if defined(__SHSTK__) && defined(__CET__)
#if defined __SHSTK__ && defined __CET__ && (__CET__ & 2) != 0
rdsspd %edx
#endif
movl %edx, 24(%esp)
@ -221,7 +221,7 @@ SYM(GTM_longjmp):
cfi_offset(%rip, 64)
cfi_register(%rsp, %rcx)
movq %rcx, %rsp
#if defined(__SHSTK__) && defined(__CET__)
#if defined __SHSTK__ && defined __CET__ && (__CET__ & 2) != 0
/* Check if Shadow Stack is enabled. */
xorq %rcx, %rcx
rdsspq %rcx
@ -259,7 +259,7 @@ SYM(GTM_longjmp):
cfi_offset(%eip, 24)
cfi_register(%esp, %ecx)
movl %ecx, %esp
#if defined(__SHSTK__) && defined(__CET__)
#if defined __SHSTK__ && defined __CET__ && (__CET__ & 2) != 0
/* Check if Shadow Stack is enabled. */
xorl %ecx, %ecx
rdsspd %ecx