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[POWERPC] Add hand-coded assembly strcmp

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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>
This commit is contained in:
Steven Rostedt 2008-03-01 03:04:57 +11:00 committed by Paul Mackerras
parent 4df4441e41
commit 0119536cd3
3 changed files with 17 additions and 0 deletions
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1
arch/powerpc/kernel/ppc_ksyms.c
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@ -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);

14
arch/powerpc/lib/string.S
View file

@ -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)

2
include/asm-powerpc/string.h
View file

@ -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);