[glibc] hppa: Align __clone stack argument to 8 bytes (Bug 25066)

[glibc] hppa: Align __clone stack argument to 8 bytes (Bug 25066)

[John David Anglin]

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 */