Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 register int r0 asm("0") = (char) c;
111 const void *ret = s + n;
112
113 asm volatile(
114 "0: srst %0,%1\n"
115 " jo 0b\n"
116 " jl 1f\n"
117 " la %0,0\n"
118 "1:"
119 : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
120 return (void *) ret;
121}
122#endif
123
124#ifdef __HAVE_ARCH_MEMSCAN
125static inline void *memscan(void *s, int c, size_t n)
126{
127 register int r0 asm("0") = (char) c;
128 const void *ret = s + n;
129
130 asm volatile(
131 "0: srst %0,%1\n"
132 " jo 0b\n"
133 : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
134 return (void *) ret;
135}
136#endif
137
138#ifdef __HAVE_ARCH_STRCAT
139static inline char *strcat(char *dst, const char *src)
140{
141 register int r0 asm("0") = 0;
142 unsigned long dummy;
143 char *ret = dst;
144
145 asm volatile(
146 "0: srst %0,%1\n"
147 " jo 0b\n"
148 "1: mvst %0,%2\n"
149 " jo 1b"
150 : "=&a" (dummy), "+a" (dst), "+a" (src)
151 : "d" (r0), "0" (0) : "cc", "memory" );
152 return ret;
153}
154#endif
155
156#ifdef __HAVE_ARCH_STRCPY
157static inline char *strcpy(char *dst, const char *src)
158{
159 register int r0 asm("0") = 0;
160 char *ret = dst;
161
162 asm volatile(
163 "0: mvst %0,%1\n"
164 " jo 0b"
165 : "+&a" (dst), "+&a" (src) : "d" (r0)
166 : "cc", "memory");
167 return ret;
168}
169#endif
170
171#if defined(__HAVE_ARCH_STRLEN) || (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
172static inline size_t __no_sanitize_prefix_strfunc(strlen)(const char *s)
173{
174 register unsigned long r0 asm("0") = 0;
175 const char *tmp = s;
176
177 asm volatile(
178 "0: srst %0,%1\n"
179 " jo 0b"
180 : "+d" (r0), "+a" (tmp) : : "cc", "memory");
181 return r0 - (unsigned long) s;
182}
183#endif
184
185#ifdef __HAVE_ARCH_STRNLEN
186static inline size_t strnlen(const char * s, size_t n)
187{
188 register int r0 asm("0") = 0;
189 const char *tmp = s;
190 const char *end = s + n;
191
192 asm volatile(
193 "0: srst %0,%1\n"
194 " jo 0b"
195 : "+a" (end), "+a" (tmp) : "d" (r0) : "cc", "memory");
196 return end - s;
197}
198#endif
199#else /* IN_ARCH_STRING_C */
200void *memchr(const void * s, int c, size_t n);
201void *memscan(void *s, int c, size_t n);
202char *strcat(char *dst, const char *src);
203char *strcpy(char *dst, const char *src);
204size_t strlen(const char *s);
205size_t strnlen(const char * s, size_t n);
206#endif /* !IN_ARCH_STRING_C */
207
208#endif /* __S390_STRING_H_ */