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
19 void *memcpy(void *dest, const void *src, size_t n);
20 void *memset(void *s, int c, size_t n);
21 void *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_STRCPY /* inline & arch function */
30 #define __HAVE_ARCH_STRLCAT /* arch function */
31 #define __HAVE_ARCH_STRLEN /* inline & arch function */
32 #define __HAVE_ARCH_STRNCAT /* arch function */
33 #define __HAVE_ARCH_STRNCPY /* arch function */
34 #define __HAVE_ARCH_STRNLEN /* inline & arch function */
35 #define __HAVE_ARCH_STRSTR /* arch function */
36 #define __HAVE_ARCH_MEMSET16 /* arch function */
37 #define __HAVE_ARCH_MEMSET32 /* arch function */
38 #define __HAVE_ARCH_MEMSET64 /* 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 /* !defined(CONFIG_KASAN) && !defined(CONFIG_KMSAN) */
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 #ifdef __HAVE_ARCH_MEMSET16
78 static inline void *memset16(uint16_t *s, uint16_t v, size_t count)
79 {
80 return __memset16(s, v, count * sizeof(v));
81 }
82 #endif
83
84 #ifdef __HAVE_ARCH_MEMSET32
85 static inline void *memset32(uint32_t *s, uint32_t v, size_t count)
86 {
87 return __memset32(s, v, count * sizeof(v));
88 }
89 #endif
90
91 #ifdef __HAVE_ARCH_MEMSET64
92 #ifdef IN_BOOT_STRING_C
93 void *memset64(uint64_t *s, uint64_t v, size_t count);
94 #else
95 static inline void *memset64(uint64_t *s, uint64_t v, size_t count)
96 {
97 return __memset64(s, v, count * sizeof(v));
98 }
99 #endif
100 #endif
101
102 #if !defined(IN_ARCH_STRING_C) && (!defined(CONFIG_FORTIFY_SOURCE) || defined(__NO_FORTIFY))
103
104 #ifdef __HAVE_ARCH_MEMCHR
105 static inline void *memchr(const void * s, int c, size_t n)
106 {
107 const void *ret = s + n;
108
109 asm volatile(
110 " lgr 0,%[c]\n"
111 "0: srst %[ret],%[s]\n"
112 " jo 0b\n"
113 " jl 1f\n"
114 " la %[ret],0\n"
115 "1:"
116 : [ret] "+&a" (ret), [s] "+&a" (s)
117 : [c] "d" (c)
118 : "cc", "memory", "");
119 return (void *) ret;
120 }
121 #endif
122
123 #ifdef __HAVE_ARCH_MEMSCAN
124 static inline void *memscan(void *s, int c, size_t n)
125 {
126 const void *ret = s + n;
127
128 asm volatile(
129 " lgr 0,%[c]\n"
130 "0: srst %[ret],%[s]\n"
131 " jo 0b\n"
132 : [ret] "+&a" (ret), [s] "+&a" (s)
133 : [c] "d" (c)
134 : "cc", "memory", "");
135 return (void *) ret;
136 }
137 #endif
138
139 #ifdef __HAVE_ARCH_STRCAT
140 static inline char *strcat(char *dst, const char *src)
141 {
142 unsigned long dummy = 0;
143 char *ret = dst;
144
145 asm volatile(
146 " lghi 0,0\n"
147 "0: srst %[dummy],%[dst]\n"
148 " jo 0b\n"
149 "1: mvst %[dummy],%[src]\n"
150 " jo 1b"
151 : [dummy] "+&a" (dummy), [dst] "+&a" (dst), [src] "+&a" (src)
152 :
153 : "cc", "memory", "");
154 return ret;
155 }
156 #endif
157
158 #ifdef __HAVE_ARCH_STRCPY
159 static inline char *strcpy(char *dst, const char *src)
160 {
161 char *ret = dst;
162
163 asm volatile(
164 " lghi 0,0\n"
165 "0: mvst %[dst],%[src]\n"
166 " jo 0b"
167 : [dst] "+&a" (dst), [src] "+&a" (src)
168 :
169 : "cc", "memory", "");
170 return ret;
171 }
172 #endif
173
174 #if defined(__HAVE_ARCH_STRLEN) || (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
175 static inline size_t __no_sanitize_prefix_strfunc(strlen)(const char *s)
176 {
177 unsigned long end = 0;
178 const char *tmp = s;
179
180 asm volatile(
181 " lghi 0,0\n"
182 "0: srst %[end],%[tmp]\n"
183 " jo 0b"
184 : [end] "+&a" (end), [tmp] "+&a" (tmp)
185 :
186 : "cc", "memory", "");
187 return end - (unsigned long)s;
188 }
189 #endif
190
191 #ifdef __HAVE_ARCH_STRNLEN
192 static inline size_t strnlen(const char * s, size_t n)
193 {
194 const char *tmp = s;
195 const char *end = s + n;
196
197 asm volatile(
198 " lghi 0,0\n"
199 "0: srst %[end],%[tmp]\n"
200 " jo 0b"
201 : [end] "+&a" (end), [tmp] "+&a" (tmp)
202 :
203 : "cc", "memory", "");
204 return end - s;
205 }
206 #endif
207 #else /* IN_ARCH_STRING_C */
208 void *memchr(const void * s, int c, size_t n);
209 void *memscan(void *s, int c, size_t n);
210 char *strcat(char *dst, const char *src);
211 char *strcpy(char *dst, const char *src);
212 size_t strlen(const char *s);
213 size_t strnlen(const char * s, size_t n);
214 #endif /* !IN_ARCH_STRING_C */
215
216 #endif /* __S390_STRING_H_ */
217
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