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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
19void *memcpy(void *dest, const void *src, size_t n);
20void *memset(void *s, int c, size_t n);
21void *memmove(void *dest, const void *src, size_t n);
22
23#if !defined(CONFIG_KASAN) && !defined(CONFIG_KMSAN)
24#define __HAVE_ARCH_MEMCHR /* inline & arch function */
25#define __HAVE_ARCH_MEMCMP /* arch function */
26#define __HAVE_ARCH_MEMSCAN /* inline & arch function */
27#define __HAVE_ARCH_STRCAT /* inline & arch function */
28#define __HAVE_ARCH_STRCMP /* arch function */
29#define __HAVE_ARCH_STRLCAT /* arch function */
30#define __HAVE_ARCH_STRLEN /* inline & arch function */
31#define __HAVE_ARCH_STRNCAT /* arch function */
32#define __HAVE_ARCH_STRNLEN /* inline & arch function */
33#define __HAVE_ARCH_STRSTR /* arch function */
34#define __HAVE_ARCH_MEMSET16 /* arch function */
35#define __HAVE_ARCH_MEMSET32 /* arch function */
36#define __HAVE_ARCH_MEMSET64 /* arch function */
37
38/* Prototypes for non-inlined arch strings functions. */
39int memcmp(const void *s1, const void *s2, size_t n);
40int strcmp(const char *s1, const char *s2);
41size_t strlcat(char *dest, const char *src, size_t n);
42char *strncat(char *dest, const char *src, size_t n);
43char *strstr(const char *s1, const char *s2);
44#endif /* !defined(CONFIG_KASAN) && !defined(CONFIG_KMSAN) */
45
46#undef __HAVE_ARCH_STRCHR
47#undef __HAVE_ARCH_STRNCHR
48#undef __HAVE_ARCH_STRNCMP
49#undef __HAVE_ARCH_STRPBRK
50#undef __HAVE_ARCH_STRSEP
51#undef __HAVE_ARCH_STRSPN
52
53#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
54
55#define strlen(s) __strlen(s)
56
57#define __no_sanitize_prefix_strfunc(x) __##x
58
59#ifndef __NO_FORTIFY
60#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
61#endif
62
63#else
64#define __no_sanitize_prefix_strfunc(x) x
65#endif /* defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) */
66
67void *__memcpy(void *dest, const void *src, size_t n);
68void *__memset(void *s, int c, size_t n);
69void *__memmove(void *dest, const void *src, size_t n);
70void *__memset16(uint16_t *s, uint16_t v, size_t count);
71void *__memset32(uint32_t *s, uint32_t v, size_t count);
72void *__memset64(uint64_t *s, uint64_t v, size_t count);
73
74#ifdef __HAVE_ARCH_MEMSET16
75static inline void *memset16(uint16_t *s, uint16_t v, size_t count)
76{
77 return __memset16(s, v, count * sizeof(v));
78}
79#endif
80
81#ifdef __HAVE_ARCH_MEMSET32
82static inline void *memset32(uint32_t *s, uint32_t v, size_t count)
83{
84 return __memset32(s, v, count * sizeof(v));
85}
86#endif
87
88#ifdef __HAVE_ARCH_MEMSET64
89#ifdef IN_BOOT_STRING_C
90void *memset64(uint64_t *s, uint64_t v, size_t count);
91#else
92static inline void *memset64(uint64_t *s, uint64_t v, size_t count)
93{
94 return __memset64(s, v, count * sizeof(v));
95}
96#endif
97#endif
98
99#if !defined(IN_ARCH_STRING_C) && (!defined(CONFIG_FORTIFY_SOURCE) || defined(__NO_FORTIFY))
100
101#ifdef __HAVE_ARCH_MEMCHR
102static inline void *memchr(const void * s, int c, size_t n)
103{
104 const void *ret = s + n;
105
106 asm volatile(
107 " lgr 0,%[c]\n"
108 "0: srst %[ret],%[s]\n"
109 " jo 0b\n"
110 " jl 1f\n"
111 " la %[ret],0\n"
112 "1:"
113 : [ret] "+&a" (ret), [s] "+&a" (s)
114 : [c] "d" (c)
115 : "cc", "memory", "0");
116 return (void *) ret;
117}
118#endif
119
120#ifdef __HAVE_ARCH_MEMSCAN
121static inline void *memscan(void *s, int c, size_t n)
122{
123 const void *ret = s + n;
124
125 asm volatile(
126 " lgr 0,%[c]\n"
127 "0: srst %[ret],%[s]\n"
128 " jo 0b"
129 : [ret] "+&a" (ret), [s] "+&a" (s)
130 : [c] "d" (c)
131 : "cc", "memory", "0");
132 return (void *) ret;
133}
134#endif
135
136#ifdef __HAVE_ARCH_STRCAT
137static inline char *strcat(char *dst, const char *src)
138{
139 unsigned long dummy = 0;
140 char *ret = dst;
141
142 asm volatile(
143 " lghi 0,0\n"
144 "0: srst %[dummy],%[dst]\n"
145 " jo 0b\n"
146 "1: mvst %[dummy],%[src]\n"
147 " jo 1b"
148 : [dummy] "+&a" (dummy), [dst] "+&a" (dst), [src] "+&a" (src)
149 :
150 : "cc", "memory", "0");
151 return ret;
152}
153#endif
154
155#if defined(__HAVE_ARCH_STRLEN) || (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
156static inline size_t __no_sanitize_prefix_strfunc(strlen)(const char *s)
157{
158 unsigned long end = 0;
159 const char *tmp = s;
160
161 asm volatile(
162 " lghi 0,0\n"
163 "0: srst %[end],%[tmp]\n"
164 " jo 0b"
165 : [end] "+&a" (end), [tmp] "+&a" (tmp)
166 :
167 : "cc", "memory", "0");
168 return end - (unsigned long)s;
169}
170#endif
171
172#ifdef __HAVE_ARCH_STRNLEN
173static inline size_t strnlen(const char * s, size_t n)
174{
175 const char *tmp = s;
176 const char *end = s + n;
177
178 asm volatile(
179 " lghi 0,0\n"
180 "0: srst %[end],%[tmp]\n"
181 " jo 0b"
182 : [end] "+&a" (end), [tmp] "+&a" (tmp)
183 :
184 : "cc", "memory", "0");
185 return end - s;
186}
187#endif
188#else /* IN_ARCH_STRING_C */
189void *memchr(const void * s, int c, size_t n);
190void *memscan(void *s, int c, size_t n);
191char *strcat(char *dst, const char *src);
192size_t strlen(const char *s);
193size_t strnlen(const char * s, size_t n);
194#endif /* !IN_ARCH_STRING_C */
195
196#endif /* __S390_STRING_H_ */