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 22 void *memcpy(void *dest, const void *src, size_t n); 23 void *memset(void *s, int c, size_t n); 24 void *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. */ 41 int memcmp(const void *s1, const void *s2, size_t n); 42 int strcmp(const char *s1, const char *s2); 43 size_t strlcat(char *dest, const char *src, size_t n); 44 char *strncat(char *dest, const char *src, size_t n); 45 char *strncpy(char *dest, const char *src, size_t n); 46 char *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 58 #define strlen(s) __strlen(s) 59 60 #define __no_sanitize_prefix_strfunc(x) __##x 61 62 #ifndef __NO_FORTIFY 63 #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */ 64 #endif 65 66 #else 67 #define __no_sanitize_prefix_strfunc(x) x 68 #endif /* defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) */ 69 70 void *__memcpy(void *dest, const void *src, size_t n); 71 void *__memset(void *s, int c, size_t n); 72 void *__memmove(void *dest, const void *src, size_t n); 73 void *__memset16(uint16_t *s, uint16_t v, size_t count); 74 void *__memset32(uint32_t *s, uint32_t v, size_t count); 75 void *__memset64(uint64_t *s, uint64_t v, size_t count); 76 77 static inline void *memset16(uint16_t *s, uint16_t v, size_t count) 78 { 79 return __memset16(s, v, count * sizeof(v)); 80 } 81 82 static inline void *memset32(uint32_t *s, uint32_t v, size_t count) 83 { 84 return __memset32(s, v, count * sizeof(v)); 85 } 86 87 static inline void *memset64(uint64_t *s, uint64_t v, size_t count) 88 { 89 return __memset64(s, v, count * sizeof(v)); 90 } 91 92 #if !defined(IN_ARCH_STRING_C) && (!defined(CONFIG_FORTIFY_SOURCE) || defined(__NO_FORTIFY)) 93 94 #ifdef __HAVE_ARCH_MEMCHR 95 static inline void *memchr(const void * s, int c, size_t n) 96 { 97 const void *ret = s + n; 98 99 asm volatile( 100 " lgr 0,%[c]\n" 101 "0: srst %[ret],%[s]\n" 102 " jo 0b\n" 103 " jl 1f\n" 104 " la %[ret],0\n" 105 "1:" 106 : [ret] "+&a" (ret), [s] "+&a" (s) 107 : [c] "d" (c) 108 : "cc", "memory", "0"); 109 return (void *) ret; 110 } 111 #endif 112 113 #ifdef __HAVE_ARCH_MEMSCAN 114 static inline void *memscan(void *s, int c, size_t n) 115 { 116 const void *ret = s + n; 117 118 asm volatile( 119 " lgr 0,%[c]\n" 120 "0: srst %[ret],%[s]\n" 121 " jo 0b\n" 122 : [ret] "+&a" (ret), [s] "+&a" (s) 123 : [c] "d" (c) 124 : "cc", "memory", "0"); 125 return (void *) ret; 126 } 127 #endif 128 129 #ifdef __HAVE_ARCH_STRCAT 130 static inline char *strcat(char *dst, const char *src) 131 { 132 unsigned long dummy = 0; 133 char *ret = dst; 134 135 asm volatile( 136 " lghi 0,0\n" 137 "0: srst %[dummy],%[dst]\n" 138 " jo 0b\n" 139 "1: mvst %[dummy],%[src]\n" 140 " jo 1b" 141 : [dummy] "+&a" (dummy), [dst] "+&a" (dst), [src] "+&a" (src) 142 : 143 : "cc", "memory", "0"); 144 return ret; 145 } 146 #endif 147 148 #ifdef __HAVE_ARCH_STRCPY 149 static inline char *strcpy(char *dst, const char *src) 150 { 151 char *ret = dst; 152 153 asm volatile( 154 " lghi 0,0\n" 155 "0: mvst %[dst],%[src]\n" 156 " jo 0b" 157 : [dst] "+&a" (dst), [src] "+&a" (src) 158 : 159 : "cc", "memory", "0"); 160 return ret; 161 } 162 #endif 163 164 #if defined(__HAVE_ARCH_STRLEN) || (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)) 165 static inline size_t __no_sanitize_prefix_strfunc(strlen)(const char *s) 166 { 167 unsigned long end = 0; 168 const char *tmp = s; 169 170 asm volatile( 171 " lghi 0,0\n" 172 "0: srst %[end],%[tmp]\n" 173 " jo 0b" 174 : [end] "+&a" (end), [tmp] "+&a" (tmp) 175 : 176 : "cc", "memory", "0"); 177 return end - (unsigned long)s; 178 } 179 #endif 180 181 #ifdef __HAVE_ARCH_STRNLEN 182 static inline size_t strnlen(const char * s, size_t n) 183 { 184 const char *tmp = s; 185 const char *end = s + n; 186 187 asm volatile( 188 " lghi 0,0\n" 189 "0: srst %[end],%[tmp]\n" 190 " jo 0b" 191 : [end] "+&a" (end), [tmp] "+&a" (tmp) 192 : 193 : "cc", "memory", "0"); 194 return end - s; 195 } 196 #endif 197 #else /* IN_ARCH_STRING_C */ 198 void *memchr(const void * s, int c, size_t n); 199 void *memscan(void *s, int c, size_t n); 200 char *strcat(char *dst, const char *src); 201 char *strcpy(char *dst, const char *src); 202 size_t strlen(const char *s); 203 size_t strnlen(const char * s, size_t n); 204 #endif /* !IN_ARCH_STRING_C */ 205 206 #endif /* __S390_STRING_H_ */ 207