sparc: Let memset return the address argument

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>

diff --git a/arch/sparc/lib/memset.S b/arch/sparc/lib/memset.S
index 99c017b..f75e690 100644 (file)
--- 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: