xref: /openbmc/linux/arch/m68k/include/asm/string.h (revision c900529f3d9161bfde5cca0754f83b4d3c3e0220)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _M68K_STRING_H_
#define _M68K_STRING_H_

#include <linux/types.h>
#include <linux/compiler.h>

#define __HAVE_ARCH_STRNLEN
static inline size_t strnlen(const char *s, size_t count)
{
	const char *sc = s;

	asm volatile ("\n"
		"1:     subq.l  #1,%1\n"
		"       jcs     2f\n"
		"       tst.b   (%0)+\n"
		"       jne     1b\n"
		"       subq.l  #1,%0\n"
		"2:"
		: "+a" (sc), "+d" (count));
	return sc - s;
}

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

	asm volatile ("\n"
		"	jra	2f\n"
		"1:	move.b	(%1),(%0)+\n"
		"	jeq	2f\n"
		"	addq.l	#1,%1\n"
		"2:	subq.l	#1,%2\n"
		"	jcc	1b\n"
		: "+a" (dest), "+a" (src), "+d" (n)
		: : "memory");
	return xdest;
}

#define __HAVE_ARCH_MEMMOVE
extern void *memmove(void *, const void *, __kernel_size_t);

extern int memcmp(const void *, const void *, __kernel_size_t);
#define memcmp(d, s, n) __builtin_memcmp(d, s, n)

#define __HAVE_ARCH_MEMSET
extern void *memset(void *, int, __kernel_size_t);
#define memset(d, c, n) __builtin_memset(d, c, n)

#define __HAVE_ARCH_MEMCPY
extern void *memcpy(void *, const void *, __kernel_size_t);
#define memcpy(d, s, n) __builtin_memcpy(d, s, n)

#endif /* _M68K_STRING_H_ */