1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_STRING_32_H
3 #define _ASM_X86_STRING_32_H
7 /* Let gcc decide whether to inline or use the out of line functions */
9 #define __HAVE_ARCH_STRCPY
10 extern char *strcpy(char *dest, const char *src);
12 #define __HAVE_ARCH_STRNCPY
13 extern char *strncpy(char *dest, const char *src, size_t count);
15 #define __HAVE_ARCH_STRCAT
16 extern char *strcat(char *dest, const char *src);
18 #define __HAVE_ARCH_STRNCAT
19 extern char *strncat(char *dest, const char *src, size_t count);
21 #define __HAVE_ARCH_STRCMP
22 extern int strcmp(const char *cs, const char *ct);
24 #define __HAVE_ARCH_STRNCMP
25 extern int strncmp(const char *cs, const char *ct, size_t count);
27 #define __HAVE_ARCH_STRCHR
28 extern char *strchr(const char *s, int c);
30 #define __HAVE_ARCH_STRLEN
31 extern size_t strlen(const char *s);
33 static __always_inline void *__memcpy(void *to, const void *from, size_t n)
36 asm volatile("rep ; movsl\n\t"
42 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
43 : "0" (n / 4), "g" (n), "1" ((long)to), "2" ((long)from)
49 * This looks ugly, but the compiler can optimize it totally,
50 * as the count is constant.
52 static __always_inline void *__constant_memcpy(void *to, const void *from,
61 *(char *)to = *(char *)from;
64 *(short *)to = *(short *)from;
67 *(int *)to = *(int *)from;
70 *(short *)to = *(short *)from;
71 *((char *)to + 2) = *((char *)from + 2);
74 *(int *)to = *(int *)from;
75 *((char *)to + 4) = *((char *)from + 4);
78 *(int *)to = *(int *)from;
79 *((short *)to + 2) = *((short *)from + 2);
82 *(int *)to = *(int *)from;
83 *((int *)to + 1) = *((int *)from + 1);
90 /* large block: use rep prefix */
92 asm volatile("rep ; movsl"
93 : "=&c" (ecx), "=&D" (edi), "=&S" (esi)
94 : "0" (n / 4), "1" (edi), "2" (esi)
98 /* small block: don't clobber ecx + smaller code */
101 : "=&D"(edi), "=&S"(esi)
106 : "=&D"(edi), "=&S"(esi)
111 : "=&D"(edi), "=&S"(esi)
116 : "=&D"(edi), "=&S"(esi)
126 : "=&D"(edi), "=&S"(esi)
132 : "=&D"(edi), "=&S"(esi)
137 asm volatile("movsw\n\tmovsb"
138 : "=&D"(edi), "=&S"(esi)
145 #define __HAVE_ARCH_MEMCPY
146 extern void *memcpy(void *, const void *, size_t);
148 #ifndef CONFIG_FORTIFY_SOURCE
150 #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
152 #endif /* !CONFIG_FORTIFY_SOURCE */
154 #define __HAVE_ARCH_MEMMOVE
155 void *memmove(void *dest, const void *src, size_t n);
157 extern int memcmp(const void *, const void *, size_t);
158 #ifndef CONFIG_FORTIFY_SOURCE
159 #define memcmp __builtin_memcmp
162 #define __HAVE_ARCH_MEMCHR
163 extern void *memchr(const void *cs, int c, size_t count);
165 static inline void *__memset_generic(void *s, char c, size_t count)
168 asm volatile("rep\n\t"
170 : "=&c" (d0), "=&D" (d1)
171 : "a" (c), "1" (s), "0" (count)
176 /* we might want to write optimized versions of these later */
177 #define __constant_count_memset(s, c, count) __memset_generic((s), (c), (count))
179 /* Added by Gertjan van Wingerde to make minix and sysv module work */
180 #define __HAVE_ARCH_STRNLEN
181 extern size_t strnlen(const char *s, size_t count);
182 /* end of additional stuff */
184 #define __HAVE_ARCH_STRSTR
185 extern char *strstr(const char *cs, const char *ct);
187 #define __memset(s, c, count) \
188 (__builtin_constant_p(count) \
189 ? __constant_count_memset((s), (c), (count)) \
190 : __memset_generic((s), (c), (count)))
192 #define __HAVE_ARCH_MEMSET
193 extern void *memset(void *, int, size_t);
194 #ifndef CONFIG_FORTIFY_SOURCE
195 #define memset(s, c, count) __builtin_memset(s, c, count)
196 #endif /* !CONFIG_FORTIFY_SOURCE */
198 #define __HAVE_ARCH_MEMSET16
199 static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
202 asm volatile("rep\n\t"
204 : "=&c" (d0), "=&D" (d1)
205 : "a" (v), "1" (s), "0" (n)
210 #define __HAVE_ARCH_MEMSET32
211 static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
214 asm volatile("rep\n\t"
216 : "=&c" (d0), "=&D" (d1)
217 : "a" (v), "1" (s), "0" (n)
223 * find the first occurrence of byte 'c', or 1 past the area if none
225 #define __HAVE_ARCH_MEMSCAN
226 extern void *memscan(void *addr, int c, size_t size);
228 #endif /* __KERNEL__ */
230 #endif /* _ASM_X86_STRING_32_H */