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From: Szabolcs Nagy <nsz@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc] aarch64: Fix the extension header write in getcontext and swapcontext
Date: Fri, 28 Oct 2022 10:18:22 +0000 (GMT) [thread overview]
Message-ID: <20221028101822.6D5AB385735C@sourceware.org> (raw)
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=09c6c6073c925235b385af1d8edf6bc853eeaf60
commit 09c6c6073c925235b385af1d8edf6bc853eeaf60
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Fri Jul 29 08:00:06 2022 +0100
aarch64: Fix the extension header write in getcontext and swapcontext
The extension header is two 32bit words and in the last header both
should be 0. There is plenty space in the __reserved area, but it's
better not to write more than we mean to.
Diff:
---
sysdeps/unix/sysv/linux/aarch64/getcontext.S | 4 ++--
sysdeps/unix/sysv/linux/aarch64/swapcontext.S | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/aarch64/getcontext.S b/sysdeps/unix/sysv/linux/aarch64/getcontext.S
index 15fbd2d1a0..3109cbd99a 100644
--- a/sysdeps/unix/sysv/linux/aarch64/getcontext.S
+++ b/sysdeps/unix/sysv/linux/aarch64/getcontext.S
@@ -86,8 +86,8 @@ ENTRY(__getcontext)
/* Write the termination context extension header. */
add x2, x2, #FPSIMD_CONTEXT_SIZE
- str xzr, [x2, #oHEAD + oMAGIC]
- str xzr, [x2, #oHEAD + oSIZE]
+ str wzr, [x2, #oHEAD + oMAGIC]
+ str wzr, [x2, #oHEAD + oSIZE]
/* Grab the signal mask */
/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
diff --git a/sysdeps/unix/sysv/linux/aarch64/swapcontext.S b/sysdeps/unix/sysv/linux/aarch64/swapcontext.S
index 1ee2e40272..e3ec9da35d 100644
--- a/sysdeps/unix/sysv/linux/aarch64/swapcontext.S
+++ b/sysdeps/unix/sysv/linux/aarch64/swapcontext.S
@@ -75,8 +75,8 @@ ENTRY(__swapcontext)
/* Write the termination context extension header. */
add x2, x2, #FPSIMD_CONTEXT_SIZE
- str xzr, [x2, #oHEAD + oMAGIC]
- str xzr, [x2, #oHEAD + oSIZE]
+ str wzr, [x2, #oHEAD + oMAGIC]
+ str wzr, [x2, #oHEAD + oSIZE]
/* Preserve ucp. */
mov x21, x1
reply other threads:[~2022-10-28 10:18 UTC|newest]
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