LXR linux/arch/m68k/include/asm/string.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _M68K_STRING_H_
   3#define _M68K_STRING_H_
   4
   5#include <linux/types.h>
   6#include <linux/compiler.h>
   7
   8#define __HAVE_ARCH_STRNLEN
   9static inline size_t strnlen(const char *s, size_t count)
  10{
  11        const char *sc = s;
  12
  13        asm volatile ("\n"
  14                "1:     subq.l  #1,%1\n"
  15                "       jcs     2f\n"
  16                "       tst.b   (%0)+\n"
  17                "       jne     1b\n"
  18                "       subq.l  #1,%0\n"
  19                "2:"
  20                : "+a" (sc), "+d" (count));
  21        return sc - s;
  22}
  23
  24#define __HAVE_ARCH_STRNCPY
  25static inline char *strncpy(char *dest, const char *src, size_t n)
  26{
  27        char *xdest = dest;
  28
  29        asm volatile ("\n"
  30                "       jra     2f\n"
  31                "1:     move.b  (%1),(%0)+\n"
  32                "       jeq     2f\n"
  33                "       addq.l  #1,%1\n"
  34                "2:     subq.l  #1,%2\n"
  35                "       jcc     1b\n"
  36                : "+a" (dest), "+a" (src), "+d" (n)
  37                : : "memory");
  38        return xdest;
  39}
  40
  41#ifndef CONFIG_COLDFIRE
  42#define __HAVE_ARCH_STRCMP
  43static inline int strcmp(const char *cs, const char *ct)
  44{
  45        char res;
  46
  47        asm ("\n"
  48                "1:     move.b  (%0)+,%2\n"     /* get *cs */
  49                "       cmp.b   (%1)+,%2\n"     /* compare a byte */
  50                "       jne     2f\n"           /* not equal, break out */
  51                "       tst.b   %2\n"           /* at end of cs? */
  52                "       jne     1b\n"           /* no, keep going */
  53                "       jra     3f\n"           /* strings are equal */
  54                "2:     sub.b   -(%1),%2\n"     /* *cs - *ct */
  55                "3:"
  56                : "+a" (cs), "+a" (ct), "=d" (res));
  57        return res;
  58}
  59#endif /* CONFIG_COLDFIRE */
  60
  61#define __HAVE_ARCH_MEMMOVE
  62extern void *memmove(void *, const void *, __kernel_size_t);
  63
  64#define memcmp(d, s, n) __builtin_memcmp(d, s, n)
  65
  66#define __HAVE_ARCH_MEMSET
  67extern void *memset(void *, int, __kernel_size_t);
  68#define memset(d, c, n) __builtin_memset(d, c, n)
  69
  70#define __HAVE_ARCH_MEMCPY
  71extern void *memcpy(void *, const void *, __kernel_size_t);
  72#define memcpy(d, s, n) __builtin_memcpy(d, s, n)
  73
  74#endif /* _M68K_STRING_H_ */
  75