LXR linux/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. */
  36extern int memcmp(const void *, const void *, size_t);
  37extern void *memcpy(void *, const void *, size_t);
  38extern void *memset(void *, int, size_t);
  39extern int strcmp(const char *,const char *);
  40extern size_t strlcat(char *, const char *, size_t);
  41extern size_t strlcpy(char *, const char *, size_t);
  42extern char *strncat(char *, const char *, size_t);
  43extern char *strncpy(char *, const char *, size_t);
  44extern char *strrchr(const char *, int);
  45extern 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
  58static 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
  73static 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
  85static 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
 101static 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
 118static 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
 134static 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 */
 147void *memchr(const void * s, int c, size_t n);
 148void *memscan(void *s, int c, size_t n);
 149char *strcat(char *dst, const char *src);
 150char *strcpy(char *dst, const char *src);
 151size_t strlen(const char *s);
 152size_t strnlen(const char * s, size_t n);
 153#endif /* !IN_ARCH_STRING_C */
 154
 155#endif /* __KERNEL__ */
 156
 157#endif /* __S390_STRING_H_ */
 158