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