linux-vybrid_public/include/asm-blackfin/string.h

#ifndef _BLACKFIN_STRING_H_
#define _BLACKFIN_STRING_H_

#ifdef __KERNEL__		/* only set these up for kernel code */

#define __HAVE_ARCH_STRCPY
extern inline char *strcpy(char *dest, const char *src)
{
	char *xdest = dest;
	char temp = 0;

	__asm__ __volatile__
	    ("1:\t%2 = B [%1++] (Z);\n\t"
	     "B [%0++] = %2;\n\t"
	     "CC = %2;\n\t"
        "if cc jump 1b (bp);\n"
	: "+&a" (dest), "+&a" (src), "=&d" (temp)
	     ::"memory", "CC");
	return xdest;
}

#define __HAVE_ARCH_STRNCPY
extern inline char *strncpy(char *dest, const char *src, size_t n)
{
	char *xdest = dest;
	char temp = 0;

	if (n == 0)
		return xdest;

	__asm__ __volatile__
	    ("1:\t%3 = B [%1++] (Z);\n\t"
	     "B [%0++] = %3;\n\t"
	     "CC = %3;\n\t"
	     "if ! cc jump 2f;\n\t"
	     "%2 += -1;\n\t"
	     "CC = %2 == 0;\n\t"
	     "if ! cc jump 1b (bp);\n"
        "2:\n"
	: "+&a" (dest), "+&a" (src), "+&da" (n), "=&d" (temp)
	     ::"memory", "CC");
	return xdest;
}

#define __HAVE_ARCH_STRCMP
extern inline int strcmp(const char *cs, const char *ct)
{
	char __res1, __res2;

	__asm__
       ("1:\t%2 = B[%0++] (Z);\n\t" /* get *cs */
		"%3 = B[%1++] (Z);\n\t"	/* get *ct */
		"CC = %2 == %3;\n\t"	/* compare a byte */
		"if ! cc jump 2f;\n\t"	/* not equal, break out */
		"CC = %2;\n\t"	/* at end of cs? */
		"if cc jump 1b (bp);\n\t"	/* no, keep going */
		"jump.s 3f;\n"	/* strings are equal */
		"2:\t%2 = %2 - %3;\n"	/* *cs - *ct */
        "3:\n"
	: "+&a" (cs), "+&a" (ct), "=&d" (__res1), "=&d" (__res2)
      : :	"CC");

	return __res1;
}

#define __HAVE_ARCH_STRNCMP
extern inline int strncmp(const char *cs, const char *ct, size_t count)
{
	char __res1, __res2;

	if (!count)
		return 0;
	__asm__
       ("1:\t%3 = B[%0++] (Z);\n\t"        /* get *cs */
		"%4 = B[%1++] (Z);\n\t"	/* get *ct */
		"CC = %3 == %4;\n\t"	/* compare a byte */
		"if ! cc jump 3f;\n\t"	/* not equal, break out */
		"CC = %3;\n\t"	/* at end of cs? */
		"if ! cc jump 4f;\n\t"	/* yes, all done */
		"%2 += -1;\n\t"	/* no, adjust count */
	"CC = %2 == 0;\n\t"
        "if ! cc jump 1b;\n"                 /* more to do, keep going */
		"2:\t%3 = 0;\n\t"	/* strings are equal */
        "jump.s    4f;\n"
        "3:\t%3 = %3 - %4;\n"          /* *cs - *ct */
        "4:"
	: "+&a" (cs), "+&a" (ct), "+&da" (count), "=&d" (__res1), "=&d" (__res2)
      : :	"CC");
	return __res1;
}

#define __HAVE_ARCH_MEMSET
extern void *memset(void *s, int c, size_t count);
#define __HAVE_ARCH_MEMCPY
extern void *memcpy(void *d, const void *s, size_t count);
#define __HAVE_ARCH_MEMCMP
extern int memcmp(const void *, const void *, __kernel_size_t);
#define	__HAVE_ARCH_MEMCHR
extern void *memchr(const void *s, int c, size_t n);
#define	__HAVE_ARCH_MEMMOVE
extern void *memmove(void *dest, const void *src, size_t count);

#endif /*__KERNEL__*/
#endif				/* _BLACKFIN_STRING_H_ */