mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
i386: Add _CET_ENDBR to indirect jump targets in add_n.S/sub_n.S
i386 add_n.S and sub_n.S use a trick to implment jump tables with LEA. We can't use conditional branches nor normal jump tables since jump table entries use EFLAGS set by jump table index. This patch adds _CET_ENDBR to indirect jump targets and adjust destination for _CET_ENDBR. Reviewed-by: Carlos O'Donell <carlos@redhat.com> * sysdeps/i386/add_n.S: Include <sysdep.h>, instead of "sysdep.h". (__mpn_add_n): Save and restore %ebx if IBT is enabed. Add _CET_ENDBR to indirect jump targets and adjust jump destination for _CET_ENDBR. * sysdeps/i386/i686/add_n.S: Include <sysdep.h>, instead of "sysdep.h". (__mpn_add_n): Save and restore %ebx if IBT is enabed. Add _CET_ENDBR to indirect jump targets and adjust jump destination for _CET_ENDBR. * sysdeps/i386/sub_n.S: Include <sysdep.h>, instead of "sysdep.h". (__mpn_sub_n): Save and restore %ebx if IBT is enabed. Add _CET_ENDBR to indirect jump targets and adjust jump destination for _CET_ENDBR.
This commit is contained in:
parent
5efc6777ad
commit
be9ccd27c0
18
ChangeLog
18
ChangeLog
@ -1,3 +1,21 @@
|
||||
2018-07-17 H.J. Lu <hongjiu.lu@intel.com>
|
||||
|
||||
* sysdeps/i386/add_n.S: Include <sysdep.h>, instead of
|
||||
"sysdep.h".
|
||||
(__mpn_add_n): Save and restore %ebx if IBT is enabed. Add
|
||||
_CET_ENDBR to indirect jump targets and adjust jump destination
|
||||
for _CET_ENDBR.
|
||||
* sysdeps/i386/i686/add_n.S: Include <sysdep.h>, instead of
|
||||
"sysdep.h".
|
||||
(__mpn_add_n): Save and restore %ebx if IBT is enabed. Add
|
||||
_CET_ENDBR to indirect jump targets and adjust jump destination
|
||||
for _CET_ENDBR.
|
||||
* sysdeps/i386/sub_n.S: Include <sysdep.h>, instead of
|
||||
"sysdep.h".
|
||||
(__mpn_sub_n): Save and restore %ebx if IBT is enabed. Add
|
||||
_CET_ENDBR to indirect jump targets and adjust jump destination
|
||||
for _CET_ENDBR.
|
||||
|
||||
2018-07-17 H.J. Lu <hongjiu.lu@intel.com>
|
||||
|
||||
* sysdeps/x86_64/multiarch/strcmp-sse42.S (STRCMP_SSE42): Add
|
||||
|
@ -17,7 +17,7 @@
|
||||
along with the GNU MP Library; see the file COPYING.LIB. If not,
|
||||
see <http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include "sysdep.h"
|
||||
#include <sysdep.h>
|
||||
#include "asm-syntax.h"
|
||||
|
||||
#define PARMS 4+8 /* space for 2 saved regs */
|
||||
@ -40,6 +40,13 @@ ENTRY (__mpn_add_n)
|
||||
cfi_rel_offset (esi, 0)
|
||||
movl S2(%esp),%edx
|
||||
movl SIZE(%esp),%ecx
|
||||
|
||||
#if IBT_ENABLED
|
||||
pushl %ebx
|
||||
cfi_adjust_cfa_offset (4)
|
||||
cfi_rel_offset (ebx, 0)
|
||||
#endif
|
||||
|
||||
movl %ecx,%eax
|
||||
shrl $3,%ecx /* compute count for unrolled loop */
|
||||
negl %eax
|
||||
@ -51,6 +58,9 @@ ENTRY (__mpn_add_n)
|
||||
subl %eax,%esi /* ... by a constant when we ... */
|
||||
subl %eax,%edx /* ... enter the loop */
|
||||
shrl $2,%eax /* restore previous value */
|
||||
#if IBT_ENABLED
|
||||
leal -4(,%eax,4),%ebx /* Count for 4-byte endbr32 */
|
||||
#endif
|
||||
#ifdef PIC
|
||||
/* Calculate start address in loop for PIC. Due to limitations in some
|
||||
assemblers, Loop-L0-3 cannot be put into the leal */
|
||||
@ -64,30 +74,40 @@ L(0): leal (%eax,%eax,8),%eax
|
||||
#else
|
||||
/* Calculate start address in loop for non-PIC. */
|
||||
leal (L(oop) - 3)(%eax,%eax,8),%eax
|
||||
#endif
|
||||
#if IBT_ENABLED
|
||||
addl %ebx,%eax /* Adjust for endbr32 */
|
||||
#endif
|
||||
jmp *%eax /* jump into loop */
|
||||
ALIGN (3)
|
||||
L(oop): movl (%esi),%eax
|
||||
adcl (%edx),%eax
|
||||
movl %eax,(%edi)
|
||||
_CET_ENDBR
|
||||
movl 4(%esi),%eax
|
||||
adcl 4(%edx),%eax
|
||||
movl %eax,4(%edi)
|
||||
_CET_ENDBR
|
||||
movl 8(%esi),%eax
|
||||
adcl 8(%edx),%eax
|
||||
movl %eax,8(%edi)
|
||||
_CET_ENDBR
|
||||
movl 12(%esi),%eax
|
||||
adcl 12(%edx),%eax
|
||||
movl %eax,12(%edi)
|
||||
_CET_ENDBR
|
||||
movl 16(%esi),%eax
|
||||
adcl 16(%edx),%eax
|
||||
movl %eax,16(%edi)
|
||||
_CET_ENDBR
|
||||
movl 20(%esi),%eax
|
||||
adcl 20(%edx),%eax
|
||||
movl %eax,20(%edi)
|
||||
_CET_ENDBR
|
||||
movl 24(%esi),%eax
|
||||
adcl 24(%edx),%eax
|
||||
movl %eax,24(%edi)
|
||||
_CET_ENDBR
|
||||
movl 28(%esi),%eax
|
||||
adcl 28(%edx),%eax
|
||||
movl %eax,28(%edi)
|
||||
@ -100,6 +120,11 @@ L(oop): movl (%esi),%eax
|
||||
sbbl %eax,%eax
|
||||
negl %eax
|
||||
|
||||
#if IBT_ENABLED
|
||||
popl %ebx
|
||||
cfi_adjust_cfa_offset (-4)
|
||||
cfi_restore (ebx)
|
||||
#endif
|
||||
popl %esi
|
||||
cfi_adjust_cfa_offset (-4)
|
||||
cfi_restore (esi)
|
||||
|
@ -17,7 +17,7 @@
|
||||
along with the GNU MP Library; see the file COPYING.LIB. If not,
|
||||
see <http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include "sysdep.h"
|
||||
#include <sysdep.h>
|
||||
#include "asm-syntax.h"
|
||||
|
||||
#define PARMS 4+8 /* space for 2 saved regs */
|
||||
@ -44,6 +44,13 @@ ENTRY (__mpn_add_n)
|
||||
cfi_rel_offset (esi, 0)
|
||||
movl S2(%esp),%edx
|
||||
movl SIZE(%esp),%ecx
|
||||
|
||||
#if IBT_ENABLED
|
||||
pushl %ebx
|
||||
cfi_adjust_cfa_offset (4)
|
||||
cfi_rel_offset (ebx, 0)
|
||||
#endif
|
||||
|
||||
movl %ecx,%eax
|
||||
shrl $3,%ecx /* compute count for unrolled loop */
|
||||
negl %eax
|
||||
@ -55,6 +62,9 @@ ENTRY (__mpn_add_n)
|
||||
subl %eax,%esi /* ... by a constant when we ... */
|
||||
subl %eax,%edx /* ... enter the loop */
|
||||
shrl $2,%eax /* restore previous value */
|
||||
#if IBT_ENABLED
|
||||
leal -4(,%eax,4),%ebx /* Count for 4-byte endbr32 */
|
||||
#endif
|
||||
#ifdef PIC
|
||||
/* Calculate start address in loop for PIC. */
|
||||
leal (L(oop)-L(0)-3)(%eax,%eax,8),%eax
|
||||
@ -63,30 +73,40 @@ L(0):
|
||||
#else
|
||||
/* Calculate start address in loop for non-PIC. */
|
||||
leal (L(oop) - 3)(%eax,%eax,8),%eax
|
||||
#endif
|
||||
#if IBT_ENABLED
|
||||
addl %ebx,%eax /* Adjust for endbr32 */
|
||||
#endif
|
||||
jmp *%eax /* jump into loop */
|
||||
ALIGN (3)
|
||||
L(oop): movl (%esi),%eax
|
||||
adcl (%edx),%eax
|
||||
movl %eax,(%edi)
|
||||
_CET_ENDBR
|
||||
movl 4(%esi),%eax
|
||||
adcl 4(%edx),%eax
|
||||
movl %eax,4(%edi)
|
||||
_CET_ENDBR
|
||||
movl 8(%esi),%eax
|
||||
adcl 8(%edx),%eax
|
||||
movl %eax,8(%edi)
|
||||
_CET_ENDBR
|
||||
movl 12(%esi),%eax
|
||||
adcl 12(%edx),%eax
|
||||
movl %eax,12(%edi)
|
||||
_CET_ENDBR
|
||||
movl 16(%esi),%eax
|
||||
adcl 16(%edx),%eax
|
||||
movl %eax,16(%edi)
|
||||
_CET_ENDBR
|
||||
movl 20(%esi),%eax
|
||||
adcl 20(%edx),%eax
|
||||
movl %eax,20(%edi)
|
||||
_CET_ENDBR
|
||||
movl 24(%esi),%eax
|
||||
adcl 24(%edx),%eax
|
||||
movl %eax,24(%edi)
|
||||
_CET_ENDBR
|
||||
movl 28(%esi),%eax
|
||||
adcl 28(%edx),%eax
|
||||
movl %eax,28(%edi)
|
||||
@ -99,6 +119,11 @@ L(oop): movl (%esi),%eax
|
||||
sbbl %eax,%eax
|
||||
negl %eax
|
||||
|
||||
#if IBT_ENABLED
|
||||
popl %ebx
|
||||
cfi_adjust_cfa_offset (-4)
|
||||
cfi_restore (ebx)
|
||||
#endif
|
||||
popl %esi
|
||||
cfi_adjust_cfa_offset (-4)
|
||||
cfi_restore (esi)
|
||||
|
@ -17,7 +17,7 @@
|
||||
along with the GNU MP Library; see the file COPYING.LIB. If not,
|
||||
see <http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include "sysdep.h"
|
||||
#include <sysdep.h>
|
||||
#include "asm-syntax.h"
|
||||
|
||||
#define PARMS 4+8 /* space for 2 saved regs */
|
||||
@ -40,6 +40,13 @@ ENTRY (__mpn_sub_n)
|
||||
cfi_rel_offset (esi, 0)
|
||||
movl S2(%esp),%edx
|
||||
movl SIZE(%esp),%ecx
|
||||
|
||||
#if IBT_ENABLED
|
||||
pushl %ebx
|
||||
cfi_adjust_cfa_offset (4)
|
||||
cfi_rel_offset (ebx, 0)
|
||||
#endif
|
||||
|
||||
movl %ecx,%eax
|
||||
shrl $3,%ecx /* compute count for unrolled loop */
|
||||
negl %eax
|
||||
@ -51,6 +58,9 @@ ENTRY (__mpn_sub_n)
|
||||
subl %eax,%esi /* ... by a constant when we ... */
|
||||
subl %eax,%edx /* ... enter the loop */
|
||||
shrl $2,%eax /* restore previous value */
|
||||
#if defined __CET__ && (__CET__ & 1) != 0
|
||||
leal -4(,%eax,4),%ebx /* Count for 4-byte endbr32 */
|
||||
#endif
|
||||
#ifdef PIC
|
||||
/* Calculate start address in loop for PIC. Due to limitations in some
|
||||
assemblers, Loop-L0-3 cannot be put into the leal */
|
||||
@ -64,30 +74,39 @@ L(0): leal (%eax,%eax,8),%eax
|
||||
#else
|
||||
/* Calculate start address in loop for non-PIC. */
|
||||
leal (L(oop) - 3)(%eax,%eax,8),%eax
|
||||
#endif
|
||||
#if defined __CET__ && (__CET__ & 1) != 0
|
||||
addl %ebx,%eax /* Adjust for endbr32 */
|
||||
#endif
|
||||
jmp *%eax /* jump into loop */
|
||||
ALIGN (3)
|
||||
L(oop): movl (%esi),%eax
|
||||
sbbl (%edx),%eax
|
||||
movl %eax,(%edi)
|
||||
_CET_ENDBR
|
||||
movl 4(%esi),%eax
|
||||
sbbl 4(%edx),%eax
|
||||
movl %eax,4(%edi)
|
||||
_CET_ENDBR
|
||||
movl 8(%esi),%eax
|
||||
sbbl 8(%edx),%eax
|
||||
movl %eax,8(%edi)
|
||||
movl 12(%esi),%eax
|
||||
sbbl 12(%edx),%eax
|
||||
movl %eax,12(%edi)
|
||||
_CET_ENDBR
|
||||
movl 16(%esi),%eax
|
||||
sbbl 16(%edx),%eax
|
||||
movl %eax,16(%edi)
|
||||
_CET_ENDBR
|
||||
movl 20(%esi),%eax
|
||||
sbbl 20(%edx),%eax
|
||||
movl %eax,20(%edi)
|
||||
_CET_ENDBR
|
||||
movl 24(%esi),%eax
|
||||
sbbl 24(%edx),%eax
|
||||
movl %eax,24(%edi)
|
||||
_CET_ENDBR
|
||||
movl 28(%esi),%eax
|
||||
sbbl 28(%edx),%eax
|
||||
movl %eax,28(%edi)
|
||||
@ -100,6 +119,11 @@ L(oop): movl (%esi),%eax
|
||||
sbbl %eax,%eax
|
||||
negl %eax
|
||||
|
||||
#if defined __CET__ && (__CET__ & 1) != 0
|
||||
popl %ebx
|
||||
cfi_adjust_cfa_offset (-4)
|
||||
cfi_restore (ebx)
|
||||
#endif
|
||||
popl %esi
|
||||
cfi_adjust_cfa_offset (-4)
|
||||
cfi_restore (esi)
|
||||
|
Loading…
Reference in New Issue
Block a user