[POWERPC] Add hand-coded assembly strcmp

We have an assembly version of strncmp for the bootwrapper, but not
for the kernel, so we end up using the C version in the kernel.  This
takes the strncmp code from the bootup and copies it to the kernel
proper, adding two instructions so it copes correctly with len==0.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index a722ede..5a4c76e 100644 (file)
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -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);

diff --git a/arch/powerpc/lib/string.S b/arch/powerpc/lib/string.S
index c4c622d..49eb1f1 100644 (file)
--- a/arch/powerpc/lib/string.S
+++ b/arch/powerpc/lib/string.S
@@ -75,6 +75,20 @@ _GLOBAL(strcmp)
        beq     1b
        blr
 
+_GLOBAL(strncmp)
+       PPC_LCMPI r5,0
+       beqlr
+       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)

diff --git a/include/asm-powerpc/string.h b/include/asm-powerpc/string.h
index aa40f92..e40010a 100644 (file)
--- a/include/asm-powerpc/string.h
+++ b/include/asm-powerpc/string.h
@@ -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);