linux/arch/s390/include/asm/string.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *  S390 version
   4 *    Copyright IBM Corp. 1999
   5 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   6 */
   7
   8#ifndef _S390_STRING_H_
   9#define _S390_STRING_H_
  10
  11#ifndef _LINUX_TYPES_H
  12#include <linux/types.h>
  13#endif
  14
  15#define __HAVE_ARCH_MEMCPY      /* gcc builtin & arch function */
  16#define __HAVE_ARCH_MEMMOVE     /* gcc builtin & arch function */
  17#define __HAVE_ARCH_MEMSET      /* gcc builtin & arch function */
  18#define __HAVE_ARCH_MEMSET16    /* arch function */
  19#define __HAVE_ARCH_MEMSET32    /* arch function */
  20#define __HAVE_ARCH_MEMSET64    /* arch function */
  21
  22void *memcpy(void *dest, const void *src, size_t n);
  23void *memset(void *s, int c, size_t n);
  24void *memmove(void *dest, const void *src, size_t n);
  25
  26#ifndef CONFIG_KASAN
  27#define __HAVE_ARCH_MEMCHR      /* inline & arch function */
  28#define __HAVE_ARCH_MEMCMP      /* arch function */
  29#define __HAVE_ARCH_MEMSCAN     /* inline & arch function */
  30#define __HAVE_ARCH_STRCAT      /* inline & arch function */
  31#define __HAVE_ARCH_STRCMP      /* arch function */
  32#define __HAVE_ARCH_STRCPY      /* inline & arch function */
  33#define __HAVE_ARCH_STRLCAT     /* arch function */
  34#define __HAVE_ARCH_STRLCPY     /* arch function */
  35#define __HAVE_ARCH_STRLEN      /* inline & arch function */
  36#define __HAVE_ARCH_STRNCAT     /* arch function */
  37#define __HAVE_ARCH_STRNCPY     /* arch function */
  38#define __HAVE_ARCH_STRNLEN     /* inline & arch function */
  39#define __HAVE_ARCH_STRRCHR     /* arch function */
  40#define __HAVE_ARCH_STRSTR      /* arch function */
  41
  42/* Prototypes for non-inlined arch strings functions. */
  43int memcmp(const void *s1, const void *s2, size_t n);
  44int strcmp(const char *s1, const char *s2);
  45size_t strlcat(char *dest, const char *src, size_t n);
  46size_t strlcpy(char *dest, const char *src, size_t size);
  47char *strncat(char *dest, const char *src, size_t n);
  48char *strncpy(char *dest, const char *src, size_t n);
  49char *strrchr(const char *s, int c);
  50char *strstr(const char *s1, const char *s2);
  51#endif /* !CONFIG_KASAN */
  52
  53#undef __HAVE_ARCH_STRCHR
  54#undef __HAVE_ARCH_STRNCHR
  55#undef __HAVE_ARCH_STRNCMP
  56#undef __HAVE_ARCH_STRPBRK
  57#undef __HAVE_ARCH_STRSEP
  58#undef __HAVE_ARCH_STRSPN
  59
  60#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
  61
  62extern void *__memcpy(void *dest, const void *src, size_t n);
  63extern void *__memset(void *s, int c, size_t n);
  64extern void *__memmove(void *dest, const void *src, size_t n);
  65
  66/*
  67 * For files that are not instrumented (e.g. mm/slub.c) we
  68 * should use not instrumented version of mem* functions.
  69 */
  70
  71#define memcpy(dst, src, len) __memcpy(dst, src, len)
  72#define memmove(dst, src, len) __memmove(dst, src, len)
  73#define memset(s, c, n) __memset(s, c, n)
  74#define strlen(s) __strlen(s)
  75
  76#define __no_sanitize_prefix_strfunc(x) __##x
  77
  78#ifndef __NO_FORTIFY
  79#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
  80#endif
  81
  82#else
  83#define __no_sanitize_prefix_strfunc(x) x
  84#endif /* defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) */
  85
  86void *__memset16(uint16_t *s, uint16_t v, size_t count);
  87void *__memset32(uint32_t *s, uint32_t v, size_t count);
  88void *__memset64(uint64_t *s, uint64_t v, size_t count);
  89
  90static inline void *memset16(uint16_t *s, uint16_t v, size_t count)
  91{
  92        return __memset16(s, v, count * sizeof(v));
  93}
  94
  95static inline void *memset32(uint32_t *s, uint32_t v, size_t count)
  96{
  97        return __memset32(s, v, count * sizeof(v));
  98}
  99
 100static inline void *memset64(uint64_t *s, uint64_t v, size_t count)
 101{
 102        return __memset64(s, v, count * sizeof(v));
 103}
 104
 105#if !defined(IN_ARCH_STRING_C) && (!defined(CONFIG_FORTIFY_SOURCE) || defined(__NO_FORTIFY))
 106
 107#ifdef __HAVE_ARCH_MEMCHR
 108static inline void *memchr(const void * s, int c, size_t n)
 109{
 110        const void *ret = s + n;
 111
 112        asm volatile(
 113                "       lgr     0,%[c]\n"
 114                "0:     srst    %[ret],%[s]\n"
 115                "       jo      0b\n"
 116                "       jl      1f\n"
 117                "       la      %[ret],0\n"
 118                "1:"
 119                : [ret] "+&a" (ret), [s] "+&a" (s)
 120                : [c] "d" (c)
 121                : "cc", "memory", "0");
 122        return (void *) ret;
 123}
 124#endif
 125
 126#ifdef __HAVE_ARCH_MEMSCAN
 127static inline void *memscan(void *s, int c, size_t n)
 128{
 129        const void *ret = s + n;
 130
 131        asm volatile(
 132                "       lgr     0,%[c]\n"
 133                "0:     srst    %[ret],%[s]\n"
 134                "       jo      0b\n"
 135                : [ret] "+&a" (ret), [s] "+&a" (s)
 136                : [c] "d" (c)
 137                : "cc", "memory", "0");
 138        return (void *) ret;
 139}
 140#endif
 141
 142#ifdef __HAVE_ARCH_STRCAT
 143static inline char *strcat(char *dst, const char *src)
 144{
 145        unsigned long dummy = 0;
 146        char *ret = dst;
 147
 148        asm volatile(
 149                "       lghi    0,0\n"
 150                "0:     srst    %[dummy],%[dst]\n"
 151                "       jo      0b\n"
 152                "1:     mvst    %[dummy],%[src]\n"
 153                "       jo      1b"
 154                : [dummy] "+&a" (dummy), [dst] "+&a" (dst), [src] "+&a" (src)
 155                :
 156                : "cc", "memory", "0");
 157        return ret;
 158}
 159#endif
 160
 161#ifdef __HAVE_ARCH_STRCPY
 162static inline char *strcpy(char *dst, const char *src)
 163{
 164        char *ret = dst;
 165
 166        asm volatile(
 167                "       lghi    0,0\n"
 168                "0:     mvst    %[dst],%[src]\n"
 169                "       jo      0b"
 170                : [dst] "+&a" (dst), [src] "+&a" (src)
 171                :
 172                : "cc", "memory", "0");
 173        return ret;
 174}
 175#endif
 176
 177#if defined(__HAVE_ARCH_STRLEN) || (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
 178static inline size_t __no_sanitize_prefix_strfunc(strlen)(const char *s)
 179{
 180        unsigned long end = 0;
 181        const char *tmp = s;
 182
 183        asm volatile(
 184                "       lghi    0,0\n"
 185                "0:     srst    %[end],%[tmp]\n"
 186                "       jo      0b"
 187                : [end] "+&a" (end), [tmp] "+&a" (tmp)
 188                :
 189                : "cc", "memory", "0");
 190        return end - (unsigned long)s;
 191}
 192#endif
 193
 194#ifdef __HAVE_ARCH_STRNLEN
 195static inline size_t strnlen(const char * s, size_t n)
 196{
 197        const char *tmp = s;
 198        const char *end = s + n;
 199
 200        asm volatile(
 201                "       lghi    0,0\n"
 202                "0:     srst    %[end],%[tmp]\n"
 203                "       jo      0b"
 204                : [end] "+&a" (end), [tmp] "+&a" (tmp)
 205                :
 206                : "cc", "memory", "0");
 207        return end - s;
 208}
 209#endif
 210#else /* IN_ARCH_STRING_C */
 211void *memchr(const void * s, int c, size_t n);
 212void *memscan(void *s, int c, size_t n);
 213char *strcat(char *dst, const char *src);
 214char *strcpy(char *dst, const char *src);
 215size_t strlen(const char *s);
 216size_t strnlen(const char * s, size_t n);
 217#endif /* !IN_ARCH_STRING_C */
 218
 219#endif /* __S390_STRING_H_ */
 220
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