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string_mm.h

#ifndef _M68K_STRING_H_
#define _M68K_STRING_H_

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

static inline size_t __kernel_strlen(const char *s)
{
      const char *sc;

      for (sc = s; *sc++; )
            ;
      return sc - s - 1;
}

static inline char *__kernel_strcpy(char *dest, const char *src)
{
      char *xdest = dest;

      asm volatile ("\n"
            "1:   move.b      (%1)+,(%0)+\n"
            "     jne   1b"
            : "+a" (dest), "+a" (src)
            : : "memory");
      return xdest;
}

#ifndef __IN_STRING_C

#define __HAVE_ARCH_STRLEN
#define strlen(s) (__builtin_constant_p(s) ?    \
                   __builtin_strlen(s) :        \
                   __kernel_strlen(s))

#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_STRCPY
#if __GNUC__ >= 4
#define strcpy(d, s)    (__builtin_constant_p(s) &&   \
                   __builtin_strlen(s) <= 32 ?  \
                   __builtin_strcpy(d, s) :     \
                   __kernel_strcpy(d, s))
#else
#define strcpy(d, s)    __kernel_strcpy(d, s)
#endif

#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_STRCAT
#define strcat(d, s)    ({                \
      char *__d = (d);              \
      strcpy(__d + strlen(__d), (s));           \
})

#define __HAVE_ARCH_STRCHR
static inline char *strchr(const char *s, int c)
{
      char sc, ch = c;

      for (; (sc = *s++) != ch; ) {
            if (!sc)
                  return NULL;
      }
      return (char *)s - 1;
}

#define __HAVE_ARCH_STRCMP
static inline int strcmp(const char *cs, const char *ct)
{
      char res;

      asm ("\n"
            "1:   move.b      (%0)+,%2\n" /* get *cs */
            "     cmp.b (%1)+,%2\n" /* compare a byte */
            "     jne   2f\n"       /* not equal, break out */
            "     tst.b %2\n"       /* at end of cs? */
            "     jne   1b\n"       /* no, keep going */
            "     jra   3f\n"       /* strings are equal */
            "2:   sub.b -(%1),%2\n" /* *cs - *ct */
            "3:"
            : "+a" (cs), "+a" (ct), "=d" (res));
      return res;
}

#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)

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

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

#endif

#endif /* _M68K_STRING_H_ */

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