Commit 0119536c authored by Steven Rostedt's avatar Steven Rostedt Committed by Paul Mackerras
Browse files

[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: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 4df4441e

arch/powerpc/kernel/ppc_ksyms.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

arch/powerpc/lib/string.S

+14 −0
Original line number Diff line number Diff line
@@ -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)

include/asm-powerpc/string.h

+2 −0
Original line number Diff line number Diff line
@@ -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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