[POWERPC] Move bootwrapper's strchr() and strncmp() from .h to string.S

Currently the bootwrapper has implementations of strchr() and
strncmp(), but they're inlines in flatdevtree_env.h, rather than in
string.S with all the rest of the string functions. This moves
them to string.S.

Signed-off-by: David Gibson <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/boot/flatdevtree_env.h

···
 #define be64_to_cpu(x)		(x)
 #define cpu_to_be64(x)		(x)
 
-static inline int strncmp(const char *cs, const char *ct, size_t count)
-{
-	signed char __res = 0;
-
-	while (count) {
-		if ((__res = *cs - *ct++) != 0 || !*cs++)
-			break;
-		count--;
-	}
-	return __res;
-}
-
-static inline char *strchr(const char *s, int c)
-{
-	for (; *s != (char)c; ++s)
-		if (*s == '\0')
-			return NULL;
-	return (char *)s;
-}
-
 #endif /* _PPC_BOOT_FLATDEVTREE_ENV_H_ */

arch/powerpc/boot/string.S

···
 	bne	1b
 	blr
 
+	.globl	strchr
+strchr:
+	addi	r3,r3,-1
+1:	lbzu	r0,1(r3)
+	cmpw	0,r0,r4
+	beqlr
+	cmpwi	0,r0,0
+	bne	1b
+	li	r3,0
+	blr
+
 	.globl	strcmp
 strcmp:
 	addi	r5,r3,-1
···
 	subf.	r3,r0,r3
 	beqlr	1
 	beq	1b
+	blr
+
+	.globl	strncmp
+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
 
 	.globl	strlen

arch/powerpc/boot/string.h

···
 extern char *strcpy(char *dest, const char *src);
 extern char *strncpy(char *dest, const char *src, size_t n);
 extern char *strcat(char *dest, const char *src);
+extern char *strchr(const char *s, int c);
 extern int strcmp(const char *s1, const char *s2);
+extern int strncmp(const char *s1, const char *s2, size_t n);
 extern size_t strlen(const char *s);
 extern size_t strnlen(const char *s, size_t count);