arch/s390/include/asm/string.h

   1 /*
   2  *  include/asm-s390/string.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7  */
   8
   9 #ifndef _S390_STRING_H_
  10 #define _S390_STRING_H_
  11
  12 #ifdef __KERNEL__
  13
  14 #ifndef _LINUX_TYPES_H
  15 #include <linux/types.h>
  16 #endif
  17
  18 #define __HAVE_ARCH_MEMCHR      /* inline & arch function */
  19 #define __HAVE_ARCH_MEMCMP      /* arch function */
  20 #define __HAVE_ARCH_MEMCPY      /* gcc builtin & arch function */
  21 #define __HAVE_ARCH_MEMSCAN     /* inline & arch function */
  22 #define __HAVE_ARCH_MEMSET      /* gcc builtin & arch function */
  23 #define __HAVE_ARCH_STRCAT      /* inline & arch function */
  24 #define __HAVE_ARCH_STRCMP      /* arch function */
  25 #define __HAVE_ARCH_STRCPY      /* inline & arch function */
  26 #define __HAVE_ARCH_STRLCAT     /* arch function */
  27 #define __HAVE_ARCH_STRLCPY     /* arch function */
  28 #define __HAVE_ARCH_STRLEN      /* inline & arch function */
  29 #define __HAVE_ARCH_STRNCAT     /* arch function */
  30 #define __HAVE_ARCH_STRNCPY     /* arch function */
  31 #define __HAVE_ARCH_STRNLEN     /* inline & arch function */
  32 #define __HAVE_ARCH_STRRCHR     /* arch function */
  33 #define __HAVE_ARCH_STRSTR      /* arch function */
  34
  35 /* Prototypes for non-inlined arch strings functions. */
  36 extern int memcmp(const void *, const void *, size_t);
  37 extern void *memcpy(void *, const void *, size_t);
  38 extern void *memset(void *, int, size_t);
  39 extern int strcmp(const char *,const char *);
  40 extern size_t strlcat(char *, const char *, size_t);
  41 extern size_t strlcpy(char *, const char *, size_t);
  42 extern char *strncat(char *, const char *, size_t);
  43 extern char *strncpy(char *, const char *, size_t);
  44 extern char *strrchr(const char *, int);
  45 extern char *strstr(const char *, const char *);
  46
  47 #undef __HAVE_ARCH_MEMMOVE
  48 #undef __HAVE_ARCH_STRCHR
  49 #undef __HAVE_ARCH_STRNCHR
  50 #undef __HAVE_ARCH_STRNCMP
  51 #undef __HAVE_ARCH_STRNICMP
  52 #undef __HAVE_ARCH_STRPBRK
  53 #undef __HAVE_ARCH_STRSEP
  54 #undef __HAVE_ARCH_STRSPN
  55
  56 #if !defined(IN_ARCH_STRING_C)
  57
  58 static inline void *memchr(const void * s, int c, size_t n)
  59 {
  60         register int r0 asm("0") = (char) c;
  61         const void *ret = s + n;
  62
  63         asm volatile(
  64                 "0:     srst    %0,%1\n"
  65                 "       jo      0b\n"
  66                 "       jl      1f\n"
  67                 "       la      %0,0\n"
  68                 "1:"
  69                 : "+a" (ret), "+&a" (s) : "d" (r0) : "cc");
  70         return (void *) ret;
  71 }
  72
  73 static inline void *memscan(void *s, int c, size_t n)
  74 {
  75         register int r0 asm("0") = (char) c;
  76         const void *ret = s + n;
  77
  78         asm volatile(
  79                 "0:     srst    %0,%1\n"
  80                 "       jo      0b\n"
  81                 : "+a" (ret), "+&a" (s) : "d" (r0) : "cc");
  82         return (void *) ret;
  83 }
  84
  85 static inline char *strcat(char *dst, const char *src)
  86 {
  87         register int r0 asm("0") = 0;
  88         unsigned long dummy;
  89         char *ret = dst;
  90
  91         asm volatile(
  92                 "0:     srst    %0,%1\n"
  93                 "       jo      0b\n"
  94                 "1:     mvst    %0,%2\n"
  95                 "       jo      1b"
  96                 : "=&a" (dummy), "+a" (dst), "+a" (src)
  97                 : "d" (r0), "0" (0) : "cc", "memory" );
  98         return ret;
  99 }
 100
 101 static inline char *strcpy(char *dst, const char *src)
 102 {
 103 #if __GNUC__ < 4
 104         register int r0 asm("0") = 0;
 105         char *ret = dst;
 106
 107         asm volatile(
 108                 "0:     mvst    %0,%1\n"
 109                 "       jo      0b"
 110                 : "+&a" (dst), "+&a" (src) : "d" (r0)
 111                 : "cc", "memory");
 112         return ret;
 113 #else
 114         return __builtin_strcpy(dst, src);
 115 #endif
 116 }
 117
 118 static inline size_t strlen(const char *s)
 119 {
 120 #if __GNUC__ < 4
 121         register unsigned long r0 asm("0") = 0;
 122         const char *tmp = s;
 123
 124         asm volatile(
 125                 "0:     srst    %0,%1\n"
 126                 "       jo      0b"
 127                 : "+d" (r0), "+a" (tmp) :  : "cc");
 128         return r0 - (unsigned long) s;
 129 #else
 130         return __builtin_strlen(s);
 131 #endif
 132 }
 133
 134 static inline size_t strnlen(const char * s, size_t n)
 135 {
 136         register int r0 asm("0") = 0;
 137         const char *tmp = s;
 138         const char *end = s + n;
 139
 140         asm volatile(
 141                 "0:     srst    %0,%1\n"
 142                 "       jo      0b"
 143                 : "+a" (end), "+a" (tmp) : "d" (r0)  : "cc");
 144         return end - s;
 145 }
 146 #else /* IN_ARCH_STRING_C */
 147 void *memchr(const void * s, int c, size_t n);
 148 void *memscan(void *s, int c, size_t n);
 149 char *strcat(char *dst, const char *src);
 150 char *strcpy(char *dst, const char *src);
 151 size_t strlen(const char *s);
 152 size_t strnlen(const char * s, size_t n);
 153 #endif /* !IN_ARCH_STRING_C */
 154
 155 #endif /* __KERNEL__ */
 156
 157 #endif /* __S390_STRING_H_ */