arch/m68k/include/asm/string.h

   1 #ifndef _M68K_STRING_H_
   2 #define _M68K_STRING_H_
   3
   4 #include <linux/types.h>
   5 #include <linux/compiler.h>
   6
   7 static inline size_t __kernel_strlen(const char *s)
   8 {
   9         const char *sc;
  10
  11         for (sc = s; *sc++; )
  12                 ;
  13         return sc - s - 1;
  14 }
  15
  16 static inline char *__kernel_strcpy(char *dest, const char *src)
  17 {
  18         char *xdest = dest;
  19
  20         asm volatile ("\n"
  21                 "1:     move.b  (%1)+,(%0)+\n"
  22                 "       jne     1b"
  23                 : "+a" (dest), "+a" (src)
  24                 : : "memory");
  25         return xdest;
  26 }
  27
  28 #ifndef __IN_STRING_C
  29
  30 #define __HAVE_ARCH_STRLEN
  31 #define strlen(s)       (__builtin_constant_p(s) ?      \
  32                          __builtin_strlen(s) :          \
  33                          __kernel_strlen(s))
  34
  35 #define __HAVE_ARCH_STRNLEN
  36 static inline size_t strnlen(const char *s, size_t count)
  37 {
  38         const char *sc = s;
  39
  40         asm volatile ("\n"
  41                 "1:     subq.l  #1,%1\n"
  42                 "       jcs     2f\n"
  43                 "       tst.b   (%0)+\n"
  44                 "       jne     1b\n"
  45                 "       subq.l  #1,%0\n"
  46                 "2:"
  47                 : "+a" (sc), "+d" (count));
  48         return sc - s;
  49 }
  50
  51 #define __HAVE_ARCH_STRCPY
  52 #if __GNUC__ >= 4
  53 #define strcpy(d, s)    (__builtin_constant_p(s) &&     \
  54                          __builtin_strlen(s) <= 32 ?    \
  55                          __builtin_strcpy(d, s) :       \
  56                          __kernel_strcpy(d, s))
  57 #else
  58 #define strcpy(d, s)    __kernel_strcpy(d, s)
  59 #endif
  60
  61 #define __HAVE_ARCH_STRNCPY
  62 static inline char *strncpy(char *dest, const char *src, size_t n)
  63 {
  64         char *xdest = dest;
  65
  66         asm volatile ("\n"
  67                 "       jra     2f\n"
  68                 "1:     move.b  (%1),(%0)+\n"
  69                 "       jeq     2f\n"
  70                 "       addq.l  #1,%1\n"
  71                 "2:     subq.l  #1,%2\n"
  72                 "       jcc     1b\n"
  73                 : "+a" (dest), "+a" (src), "+d" (n)
  74                 : : "memory");
  75         return xdest;
  76 }
  77
  78 #define __HAVE_ARCH_STRCAT
  79 #define strcat(d, s)    ({                      \
  80         char *__d = (d);                        \
  81         strcpy(__d + strlen(__d), (s));         \
  82 })
  83
  84 #define __HAVE_ARCH_STRCHR
  85 static inline char *strchr(const char *s, int c)
  86 {
  87         char sc, ch = c;
  88
  89         for (; (sc = *s++) != ch; ) {
  90                 if (!sc)
  91                         return NULL;
  92         }
  93         return (char *)s - 1;
  94 }
  95
  96 #ifndef CONFIG_COLDFIRE
  97 #define __HAVE_ARCH_STRCMP
  98 static inline int strcmp(const char *cs, const char *ct)
  99 {
 100         char res;
 101
 102         asm ("\n"
 103                 "1:     move.b  (%0)+,%2\n"     /* get *cs */
 104                 "       cmp.b   (%1)+,%2\n"     /* compare a byte */
 105                 "       jne     2f\n"           /* not equal, break out */
 106                 "       tst.b   %2\n"           /* at end of cs? */
 107                 "       jne     1b\n"           /* no, keep going */
 108                 "       jra     3f\n"           /* strings are equal */
 109                 "2:     sub.b   -(%1),%2\n"     /* *cs - *ct */
 110                 "3:"
 111                 : "+a" (cs), "+a" (ct), "=d" (res));
 112         return res;
 113 }
 114
 115 #define __HAVE_ARCH_MEMMOVE
 116 extern void *memmove(void *, const void *, __kernel_size_t);
 117
 118 #define __HAVE_ARCH_MEMCMP
 119 extern int memcmp(const void *, const void *, __kernel_size_t);
 120 #define memcmp(d, s, n) __builtin_memcmp(d, s, n)
 121 #endif /* CONFIG_COLDFIRE */
 122
 123 #define __HAVE_ARCH_MEMSET
 124 extern void *memset(void *, int, __kernel_size_t);
 125 #define memset(d, c, n) __builtin_memset(d, c, n)
 126
 127 #define __HAVE_ARCH_MEMCPY
 128 extern void *memcpy(void *, const void *, __kernel_size_t);
 129 #define memcpy(d, s, n) __builtin_memcpy(d, s, n)
 130
 131 #endif
 132
 133 #endif /* _M68K_STRING_H_ */