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V2 [PATCH 3/5] i386: Add _CET_ENDBR to assembly files without ENTRY
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: libc-alpha at sourceware dot org
- Date: Wed, 8 Jan 2020 08:15:33 -0800
- Subject: V2 [PATCH 3/5] i386: Add _CET_ENDBR to assembly files without ENTRY
- References: <20200108161535.6141-1-hjl.tools@gmail.com>
Add _CET_ENDBR to i386 assembly files which don't use ENTRY to add
ENDBR32 at function entries when CET is enabled.
---
sysdeps/i386/i386-mcount.S | 2 ++
sysdeps/i386/nptl/pthread_spin_lock.S | 2 ++
sysdeps/i386/nptl/pthread_spin_unlock.S | 3 +++
sysdeps/i386/pthread_spin_trylock.S | 2 ++
4 files changed, 9 insertions(+)
diff --git a/sysdeps/i386/i386-mcount.S b/sysdeps/i386/i386-mcount.S
index 9516265bcb..8b60bd20fe 100644
--- a/sysdeps/i386/i386-mcount.S
+++ b/sysdeps/i386/i386-mcount.S
@@ -30,6 +30,7 @@
.type C_SYMBOL_NAME(_mcount), @function
.align ALIGNARG(4)
C_LABEL(_mcount)
+ _CET_ENDBR
/* Save the caller-clobbered registers. */
pushl %eax
pushl %ecx
@@ -58,6 +59,7 @@ weak_alias (_mcount, mcount)
.type C_SYMBOL_NAME(__fentry__), @function
.align ALIGNARG(4)
C_LABEL(__fentry__)
+ _CET_ENDBR
/* Save the caller-clobbered registers. */
pushl %eax
pushl %ecx
diff --git a/sysdeps/i386/nptl/pthread_spin_lock.S b/sysdeps/i386/nptl/pthread_spin_lock.S
index 5736c82078..7eb8f0e069 100644
--- a/sysdeps/i386/nptl/pthread_spin_lock.S
+++ b/sysdeps/i386/nptl/pthread_spin_lock.S
@@ -15,12 +15,14 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <sysdep.h>
#include <lowlevellock.h>
.globl pthread_spin_lock
.type pthread_spin_lock,@function
.align 16
pthread_spin_lock:
+ _CET_ENDBR
mov 4(%esp), %eax
1: LOCK
decl 0(%eax)
diff --git a/sysdeps/i386/nptl/pthread_spin_unlock.S b/sysdeps/i386/nptl/pthread_spin_unlock.S
index e7757d0a03..dac730af1f 100644
--- a/sysdeps/i386/nptl/pthread_spin_unlock.S
+++ b/sysdeps/i386/nptl/pthread_spin_unlock.S
@@ -16,10 +16,13 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <sysdep.h>
+
.globl pthread_spin_unlock
.type pthread_spin_unlock,@function
.align 16
pthread_spin_unlock:
+ _CET_ENDBR
movl 4(%esp), %eax
movl $1, (%eax)
xorl %eax, %eax
diff --git a/sysdeps/i386/pthread_spin_trylock.S b/sysdeps/i386/pthread_spin_trylock.S
index dd08d38f8d..b3965a150f 100644
--- a/sysdeps/i386/pthread_spin_trylock.S
+++ b/sysdeps/i386/pthread_spin_trylock.S
@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <sysdep.h>
#include <pthread-errnos.h>
@@ -29,6 +30,7 @@
.type pthread_spin_trylock,@function
.align 16
pthread_spin_trylock:
+ _CET_ENDBR
movl 4(%esp), %edx
movl $1, %eax
xorl %ecx, %ecx
--
2.24.1