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authorAndreas Larsson <andreas@gaisler.com>2014-08-29 17:08:21 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-10-30 09:40:19 -0700
commita068a292f5c1fb7ca0a914342c7403406827a856 (patch)
tree9dacafdd0d0d3d426f7c1c513eb5721570a88b49
parent200fe7a70417e5952f961a49779583b49509de24 (diff)
downloadlinux-linaro-stable-a068a292f5c1fb7ca0a914342c7403406827a856.tar.gz
sparc: Let memset return the address argument
[ Upstream commit 74cad25c076a2f5253312c2fe82d1a4daecc1323 ] This makes memset follow the standard (instead of returning 0 on success). This is needed when certain versions of gcc optimizes around memset calls and assume that the address argument is preserved in %o0. Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/sparc/lib/memset.S18
1 files changed, 14 insertions, 4 deletions
diff --git a/arch/sparc/lib/memset.S b/arch/sparc/lib/memset.S
index 99c017be8719..f75e6906df14 100644
--- a/arch/sparc/lib/memset.S
+++ b/arch/sparc/lib/memset.S
@@ -3,8 +3,9 @@
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*
- * Returns 0, if ok, and number of bytes not yet set if exception
- * occurs and we were called as clear_user.
+ * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and
+ * number of bytes not yet set if exception occurs and we were called as
+ * clear_user.
*/
#include <asm/ptrace.h>
@@ -65,6 +66,8 @@ __bzero_begin:
.globl __memset_start, __memset_end
__memset_start:
memset:
+ mov %o0, %g1
+ mov 1, %g4
and %o1, 0xff, %g3
sll %g3, 8, %g2
or %g3, %g2, %g3
@@ -89,6 +92,7 @@ memset:
sub %o0, %o2, %o0
__bzero:
+ clr %g4
mov %g0, %g3
1:
cmp %o1, 7
@@ -151,8 +155,8 @@ __bzero:
bne,a 8f
EX(stb %g3, [%o0], and %o1, 1)
8:
- retl
- clr %o0
+ b 0f
+ nop
7:
be 13b
orcc %o1, 0, %g0
@@ -164,6 +168,12 @@ __bzero:
bne 8b
EX(stb %g3, [%o0 - 1], add %o1, 1)
0:
+ andcc %g4, 1, %g0
+ be 5f
+ nop
+ retl
+ mov %g1, %o0
+5:
retl
clr %o0
__memset_end: