diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2008-03-01 03:04:57 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-07 10:03:03 +1000 |
| commit | 0119536cd314ef95553604208c25bc35581f7f0a (patch) | |
| tree | c196d0652c5bc6bee252d6628cfd76771b2e9131 | |
| parent | 4df4441e418c809f263939b9f371b67aca28a280 (diff) | |
[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>
| -rw-r--r-- | arch/powerpc/kernel/ppc_ksyms.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/lib/string.S | 14 | ||||
| -rw-r--r-- | include/asm-powerpc/string.h | 2 |
3 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c index a722ede726d..5a4c76eada4 100644 --- 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 c4c622d8e6a..49eb1f1a2bb 100644 --- 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 aa40f92c298..e40010abcaf 100644 --- 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); |