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* [glibc] hppa: Align __clone stack argument to 8 bytes (Bug 25066)
@ 2019-11-03 21:29 John David Anglin
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From: John David Anglin @ 2019-11-03 21:29 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e4c23a029a54c8c7788eff9ca771a01cccaaa0ce
commit e4c23a029a54c8c7788eff9ca771a01cccaaa0ce
Author: John David Anglin <danglin@gcc.gnu.org>
Date: Sun Nov 3 16:28:01 2019 -0500
hppa: Align __clone stack argument to 8 bytes (Bug 25066)
The hppa architecture requires strict alignment for loads and stores.
As a result, the minimum stack alignment that will work is 8 bytes.
This patch adjusts __clone() to align the stack argument passed to it.
It also adjusts slightly some formatting.
This fixes the nptl/tst-tls1 test.
Diff:
---
sysdeps/unix/sysv/linux/hppa/clone.S | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/hppa/clone.S b/sysdeps/unix/sysv/linux/hppa/clone.S
index 6db2cb5..372d29a 100644
--- a/sysdeps/unix/sysv/linux/hppa/clone.S
+++ b/sysdeps/unix/sysv/linux/hppa/clone.S
@@ -73,13 +73,18 @@ ENTRY(__clone)
#endif
/* Sanity check arguments. */
- comib,=,n 0, %arg0, .LerrorSanity /* no NULL function pointers */
- comib,=,n 0, %arg1, .LerrorSanity /* no NULL stack pointers */
+ comib,=,n 0,%arg0,.LerrorSanity /* no NULL function pointers */
+ comib,=,n 0,%arg1,.LerrorSanity /* no NULL stack pointers */
+
+ /* Ensure stack argument is 8-byte aligned. */
+ ldo 7(%r25),%r25
+ depi 0,31,3,%r25
/* Save the function pointer, arg, and flags on the new stack. */
stwm %r26, 64(%r25)
stw %r23, -60(%r25)
stw %r24, -56(%r25)
+
/* Clone arguments are (int flags, void * child_stack) */
copy %r24, %r26 /* flags are first */
/* User stack pointer is in the correct register already */
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2019-11-03 21:29 [glibc] hppa: Align __clone stack argument to 8 bytes (Bug 25066) John David Anglin
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