linux-kernel - [PATCH] add strncmp to PowerPC

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Date:	Fri, 29 Feb 2008 11:04:57 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulus@...ba.org, linuxppc-dev@...abs.org
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] add strncmp to PowerPC


strncmp is defined in assembly for bootup, but it is not defined in the
normal running kernel. This patch takes the strncmp code from the bootup
and copies it to the kernel proper.

Signed-off-by: Steven Rostedt <srostedt@...hat.com>
---
 arch/powerpc/kernel/ppc_ksyms.c |    1 +
 arch/powerpc/lib/string.S       |   12 ++++++++++++
 include/asm-powerpc/string.h    |    2 ++
 3 files changed, 15 insertions(+)

Index: linux-sched-devel.git/arch/powerpc/kernel/ppc_ksyms.c
===================================================================
--- linux-sched-devel.git.orig/arch/powerpc/kernel/ppc_ksyms.c	2008-02-27 14:01:38.000000000 -0800
+++ linux-sched-devel.git/arch/powerpc/kernel/ppc_ksyms.c	2008-02-29 07:24:22.000000000 -0800
@@ -78,6 +78,7 @@ EXPORT_SYMBOL(strncpy);
 EXPORT_SYMBOL(strcat);
 EXPORT_SYMBOL(strlen);
 EXPORT_SYMBOL(strcmp);
+EXPORT_SYMBOL(strncmp);
 
 EXPORT_SYMBOL(csum_partial);
 EXPORT_SYMBOL(csum_partial_copy_generic);
Index: linux-sched-devel.git/arch/powerpc/lib/string.S
===================================================================
--- linux-sched-devel.git.orig/arch/powerpc/lib/string.S	2008-02-27 14:01:38.000000000 -0800
+++ linux-sched-devel.git/arch/powerpc/lib/string.S	2008-02-29 07:24:22.000000000 -0800
@@ -75,6 +75,18 @@ _GLOBAL(strcmp)
 	beq	1b
 	blr
 
+_GLOBAL(strncmp)
+	mtctr	r5
+	addi	r5,r3,-1
+	addi	r4,r4,-1
+1:	lbzu	r3,1(r5)
+	cmpwi	1,r3,0
+	lbzu	r0,1(r4)
+	subf.	r3,r0,r3
+	beqlr	1
+	bdnzt	eq,1b
+	blr
+
 _GLOBAL(strlen)
 	addi	r4,r3,-1
 1:	lbzu	r0,1(r4)
Index: linux-sched-devel.git/include/asm-powerpc/string.h
===================================================================
--- linux-sched-devel.git.orig/include/asm-powerpc/string.h	2008-02-27 14:01:58.000000000 -0800
+++ linux-sched-devel.git/include/asm-powerpc/string.h	2008-02-29 07:24:22.000000000 -0800
@@ -7,6 +7,7 @@
 #define __HAVE_ARCH_STRNCPY
 #define __HAVE_ARCH_STRLEN
 #define __HAVE_ARCH_STRCMP
+#define __HAVE_ARCH_STRNCMP
 #define __HAVE_ARCH_STRCAT
 #define __HAVE_ARCH_MEMSET
 #define __HAVE_ARCH_MEMCPY
@@ -18,6 +19,7 @@ extern char * strcpy(char *,const char *
 extern char * strncpy(char *,const char *, __kernel_size_t);
 extern __kernel_size_t strlen(const char *);
 extern int strcmp(const char *,const char *);
+extern int strncmp(const char *,const char *,__kernel_size_t);
 extern char * strcat(char *, const char *);
 extern void * memset(void *,int,__kernel_size_t);
 extern void * memcpy(void *,const void *,__kernel_size_t);


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