include/asm-s390/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 ("0: srst  %0,%1\n"
  64                       "   jo    0b\n"
  65                       "   jl    1f\n"
  66                       "   la    %0,0\n"
  67                       "1:"
  68                       : "+a" (ret), "+&a" (s) : "d" (r0) : "cc" );
  69         return (void *) ret;
  70 }
  71
  72 static inline void *memscan(void *s, int c, size_t n)
  73 {
  74         register int r0 asm("0") = (char) c;
  75         const void *ret = s + n;
  76
  77         asm volatile ("0: srst  %0,%1\n"
  78                       "   jo    0b\n"
  79                       : "+a" (ret), "+&a" (s) : "d" (r0) : "cc" );
  80         return (void *) ret;
  81 }
  82
  83 static inline char *strcat(char *dst, const char *src)
  84 {
  85         register int r0 asm("0") = 0;
  86         unsigned long dummy;
  87         char *ret = dst;
  88
  89         asm volatile ("0: srst  %0,%1\n"
  90                       "   jo    0b\n"
  91                       "1: mvst  %0,%2\n"
  92                       "   jo    1b"
  93                       : "=&a" (dummy), "+a" (dst), "+a" (src)
  94                       : "d" (r0), "0" (0) : "cc", "memory" );
  95         return ret;
  96 }
  97
  98 static inline char *strcpy(char *dst, const char *src)
  99 {
 100         register int r0 asm("0") = 0;
 101         char *ret = dst;
 102
 103         asm volatile ("0: mvst  %0,%1\n"
 104                       "   jo    0b"
 105                       : "+&a" (dst), "+&a" (src) : "d" (r0)
 106                       : "cc", "memory" );
 107         return ret;
 108 }
 109
 110 static inline size_t strlen(const char *s)
 111 {
 112         register unsigned long r0 asm("0") = 0;
 113         const char *tmp = s;
 114
 115         asm volatile ("0: srst  %0,%1\n"
 116                       "   jo    0b"
 117                       : "+d" (r0), "+a" (tmp) :  : "cc" );
 118         return r0 - (unsigned long) s;
 119 }
 120
 121 static inline size_t strnlen(const char * s, size_t n)
 122 {
 123         register int r0 asm("0") = 0;
 124         const char *tmp = s;
 125         const char *end = s + n;
 126
 127         asm volatile ("0: srst  %0,%1\n"
 128                       "   jo    0b"
 129                       : "+a" (end), "+a" (tmp) : "d" (r0)  : "cc" );
 130         return end - s;
 131 }
 132
 133 #endif /* !IN_ARCH_STRING_C */
 134
 135 #endif /* __KERNEL__ */
 136
 137 #endif /* __S390_STRING_H_ */