[src/trunk]: src/lib/libc/arch/powerpc/string PR/50228: Christian Groessler: ...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c7657cde71c9
branches:  trunk
changeset: 819848:c7657cde71c9
user:      christos <christos%NetBSD.org@localhost>
date:      Mon Dec 19 14:30:23 2016 +0000

description:
PR/50228: Christian Groessler: fix bzero(ptr, 0) on ppc. Check for 0 length
before jumping to cb_memset like memset does.

diffstat:

 lib/libc/arch/powerpc/string/bzero.S |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 409eac69f226 -r c7657cde71c9 lib/libc/arch/powerpc/string/bzero.S
--- a/lib/libc/arch/powerpc/string/bzero.S      Mon Dec 19 14:10:57 2016 +0000
+++ b/lib/libc/arch/powerpc/string/bzero.S      Mon Dec 19 14:30:23 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bzero.S,v 1.14 2013/09/12 15:36:15 joerg Exp $ */
+/*     $NetBSD: bzero.S,v 1.15 2016/12/19 14:30:23 christos Exp $ */
 
 /*-
  * Copyright (C) 2001  Martin J. Laubach <mjl%NetBSD.org@localhost>
@@ -32,7 +32,7 @@
 
 
 #if defined(LIBC_SCCS) && !defined(lint)
-__RCSID("$NetBSD: bzero.S,v 1.14 2013/09/12 15:36:15 joerg Exp $")
+__RCSID("$NetBSD: bzero.S,v 1.15 2016/12/19 14:30:23 christos Exp $")
 #endif /* LIBC_SCCS && !lint */
 
 #include "assym.h"
@@ -54,6 +54,8 @@
                .align 4
 ENTRY(bzero)
                li      r_val, 0                /* Value to stuff in */
+               cmplwi  %cr1, %r4, 0            /* Zero length? */
+               beqlr-  %cr1                    /* Yes, do nothing */
                b       cb_memset
 END(bzero)