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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_MEMCHR /* inline & arch function */
16#define __HAVE_ARCH_MEMCMP /* arch function */
17#define __HAVE_ARCH_MEMCPY /* gcc builtin & arch function */
18#define __HAVE_ARCH_MEMMOVE /* gcc builtin & arch function */
19#define __HAVE_ARCH_MEMSCAN /* inline & arch function */
20#define __HAVE_ARCH_MEMSET /* gcc builtin & arch function */
21#define __HAVE_ARCH_MEMSET16 /* arch function */
22#define __HAVE_ARCH_MEMSET32 /* arch function */
23#define __HAVE_ARCH_MEMSET64 /* arch function */
24#define __HAVE_ARCH_STRCAT /* inline & arch function */
25#define __HAVE_ARCH_STRCMP /* arch function */
26#define __HAVE_ARCH_STRCPY /* inline & arch function */
27#define __HAVE_ARCH_STRLCAT /* arch function */
28#define __HAVE_ARCH_STRLCPY /* arch function */
29#define __HAVE_ARCH_STRLEN /* inline & arch function */
30#define __HAVE_ARCH_STRNCAT /* arch function */
31#define __HAVE_ARCH_STRNCPY /* arch function */
32#define __HAVE_ARCH_STRNLEN /* inline & arch function */
33#define __HAVE_ARCH_STRRCHR /* arch function */
34#define __HAVE_ARCH_STRSTR /* arch function */
35
36/* Prototypes for non-inlined arch strings functions. */
37int memcmp(const void *s1, const void *s2, size_t n);
38void *memcpy(void *dest, const void *src, size_t n);
39void *memset(void *s, int c, size_t n);
40void *memmove(void *dest, const void *src, size_t n);
41int strcmp(const char *s1, const char *s2);
42size_t strlcat(char *dest, const char *src, size_t n);
43size_t strlcpy(char *dest, const char *src, size_t size);
44char *strncat(char *dest, const char *src, size_t n);
45char *strncpy(char *dest, const char *src, size_t n);
46char *strrchr(const char *s, int c);
47char *strstr(const char *s1, const char *s2);
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
71#ifndef __NO_FORTIFY
72#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
73#endif
74
75#endif /* defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) */
76
77void *__memset16(uint16_t *s, uint16_t v, size_t count);
78void *__memset32(uint32_t *s, uint32_t v, size_t count);
79void *__memset64(uint64_t *s, uint64_t v, size_t count);
80
81static inline void *memset16(uint16_t *s, uint16_t v, size_t count)
82{
83 return __memset16(s, v, count * sizeof(v));
84}
85
86static inline void *memset32(uint32_t *s, uint32_t v, size_t count)
87{
88 return __memset32(s, v, count * sizeof(v));
89}
90
91static inline void *memset64(uint64_t *s, uint64_t v, size_t count)
92{
93 return __memset64(s, v, count * sizeof(v));
94}
95
96#if !defined(IN_ARCH_STRING_C) && (!defined(CONFIG_FORTIFY_SOURCE) || defined(__NO_FORTIFY))
97
98static inline void *memchr(const void * s, int c, size_t n)
99{
100 register int r0 asm("0") = (char) c;
101 const void *ret = s + n;
102
103 asm volatile(
104 "0: srst %0,%1\n"
105 " jo 0b\n"
106 " jl 1f\n"
107 " la %0,0\n"
108 "1:"
109 : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
110 return (void *) ret;
111}
112
113static inline void *memscan(void *s, int c, size_t n)
114{
115 register int r0 asm("0") = (char) c;
116 const void *ret = s + n;
117
118 asm volatile(
119 "0: srst %0,%1\n"
120 " jo 0b\n"
121 : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
122 return (void *) ret;
123}
124
125static inline char *strcat(char *dst, const char *src)
126{
127 register int r0 asm("0") = 0;
128 unsigned long dummy;
129 char *ret = dst;
130
131 asm volatile(
132 "0: srst %0,%1\n"
133 " jo 0b\n"
134 "1: mvst %0,%2\n"
135 " jo 1b"
136 : "=&a" (dummy), "+a" (dst), "+a" (src)
137 : "d" (r0), "0" (0) : "cc", "memory" );
138 return ret;
139}
140
141static inline char *strcpy(char *dst, const char *src)
142{
143 register int r0 asm("0") = 0;
144 char *ret = dst;
145
146 asm volatile(
147 "0: mvst %0,%1\n"
148 " jo 0b"
149 : "+&a" (dst), "+&a" (src) : "d" (r0)
150 : "cc", "memory");
151 return ret;
152}
153
154static inline size_t strlen(const char *s)
155{
156 register unsigned long r0 asm("0") = 0;
157 const char *tmp = s;
158
159 asm volatile(
160 "0: srst %0,%1\n"
161 " jo 0b"
162 : "+d" (r0), "+a" (tmp) : : "cc", "memory");
163 return r0 - (unsigned long) s;
164}
165
166static inline size_t strnlen(const char * s, size_t n)
167{
168 register int r0 asm("0") = 0;
169 const char *tmp = s;
170 const char *end = s + n;
171
172 asm volatile(
173 "0: srst %0,%1\n"
174 " jo 0b"
175 : "+a" (end), "+a" (tmp) : "d" (r0) : "cc", "memory");
176 return end - s;
177}
178#else /* IN_ARCH_STRING_C */
179void *memchr(const void * s, int c, size_t n);
180void *memscan(void *s, int c, size_t n);
181char *strcat(char *dst, const char *src);
182char *strcpy(char *dst, const char *src);
183size_t strlen(const char *s);
184size_t strnlen(const char * s, size_t n);
185#endif /* !IN_ARCH_STRING_C */
186
187#endif /* __S390_STRING_H_ */