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sparc: Let memset return the address argument

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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>
This commit is contained in:
Andreas Larsson 2014-08-29 17:08:21 +02:00 committed by David S. Miller
parent 4083162585
commit 74cad25c07
1 changed files with 14 additions and 4 deletions
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18
arch/sparc/lib/memset.S
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@ -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: