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From: Szabolcs Nagy <nsz@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/arm/morello/main] aarch64: Fix the extension header write in getcontext and swapcontext
Date: Wed, 23 Nov 2022 14:38:50 +0000 (GMT) [thread overview]
Message-ID: <20221123143850.906A43852C5C@sourceware.org> (raw)
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c505926c319b9ab6e849664968cb722c35acaf88
commit c505926c319b9ab6e849664968cb722c35acaf88
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
next reply other threads:[~2022-11-23 14:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-23 14:38 Szabolcs Nagy [this message]
-- strict thread matches above, loose matches on Subject: below --
2022-10-27 13:48 Szabolcs Nagy
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