Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _I386_STRING_H_ |
2 | #define _I386_STRING_H_ | |
3 | ||
4 | #ifdef __KERNEL__ | |
1da177e4 | 5 | |
06b0f574 | 6 | /* Let gcc decide whether to inline or use the out of line functions */ |
1da177e4 LT |
7 | |
8 | #define __HAVE_ARCH_STRCPY | |
b520b85a | 9 | extern char *strcpy(char *dest, const char *src); |
1da177e4 LT |
10 | |
11 | #define __HAVE_ARCH_STRNCPY | |
b520b85a | 12 | extern char *strncpy(char *dest, const char *src, size_t count); |
1da177e4 LT |
13 | |
14 | #define __HAVE_ARCH_STRCAT | |
b520b85a | 15 | extern char *strcat(char *dest, const char *src); |
1da177e4 LT |
16 | |
17 | #define __HAVE_ARCH_STRNCAT | |
b520b85a | 18 | extern char *strncat(char *dest, const char *src, size_t count); |
1da177e4 LT |
19 | |
20 | #define __HAVE_ARCH_STRCMP | |
b520b85a | 21 | extern int strcmp(const char *cs, const char *ct); |
1da177e4 LT |
22 | |
23 | #define __HAVE_ARCH_STRNCMP | |
b520b85a | 24 | extern int strncmp(const char *cs, const char *ct, size_t count); |
1da177e4 LT |
25 | |
26 | #define __HAVE_ARCH_STRCHR | |
b520b85a | 27 | extern char *strchr(const char *s, int c); |
1da177e4 | 28 | |
1da177e4 | 29 | #define __HAVE_ARCH_STRLEN |
b520b85a | 30 | extern size_t strlen(const char *s); |
1da177e4 | 31 | |
78d64fc2 | 32 | static __always_inline void *__memcpy(void *to, const void *from, size_t n) |
1da177e4 | 33 | { |
78d64fc2 JP |
34 | int d0, d1, d2; |
35 | asm volatile("rep ; movsl\n\t" | |
36 | "movl %4,%%ecx\n\t" | |
37 | "andl $3,%%ecx\n\t" | |
38 | "jz 1f\n\t" | |
39 | "rep ; movsb\n\t" | |
40 | "1:" | |
41 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) | |
42 | : "0" (n / 4), "g" (n), "1" ((long)to), "2" ((long)from) | |
43 | : "memory"); | |
44 | return to; | |
1da177e4 LT |
45 | } |
46 | ||
47 | /* | |
d5b63d78 | 48 | * This looks ugly, but the compiler can optimize it totally, |
1da177e4 LT |
49 | * as the count is constant. |
50 | */ | |
78d64fc2 JP |
51 | static __always_inline void *__constant_memcpy(void *to, const void *from, |
52 | size_t n) | |
1da177e4 | 53 | { |
d5b63d78 | 54 | long esi, edi; |
78d64fc2 JP |
55 | if (!n) |
56 | return to; | |
57 | ||
d5b63d78 | 58 | switch (n) { |
78d64fc2 JP |
59 | case 1: |
60 | *(char *)to = *(char *)from; | |
61 | return to; | |
62 | case 2: | |
63 | *(short *)to = *(short *)from; | |
64 | return to; | |
65 | case 4: | |
66 | *(int *)to = *(int *)from; | |
67 | return to; | |
68 | ||
69 | case 3: | |
70 | *(short *)to = *(short *)from; | |
71 | *((char *)to + 2) = *((char *)from + 2); | |
72 | return to; | |
73 | case 5: | |
74 | *(int *)to = *(int *)from; | |
75 | *((char *)to + 4) = *((char *)from + 4); | |
76 | return to; | |
77 | case 6: | |
78 | *(int *)to = *(int *)from; | |
79 | *((short *)to + 2) = *((short *)from + 2); | |
80 | return to; | |
81 | case 8: | |
82 | *(int *)to = *(int *)from; | |
83 | *((int *)to + 1) = *((int *)from + 1); | |
84 | return to; | |
d5b63d78 | 85 | } |
78d64fc2 JP |
86 | |
87 | esi = (long)from; | |
88 | edi = (long)to; | |
89 | if (n >= 5 * 4) { | |
d5b63d78 DV |
90 | /* large block: use rep prefix */ |
91 | int ecx; | |
78d64fc2 JP |
92 | asm volatile("rep ; movsl" |
93 | : "=&c" (ecx), "=&D" (edi), "=&S" (esi) | |
94 | : "0" (n / 4), "1" (edi), "2" (esi) | |
95 | : "memory" | |
d5b63d78 DV |
96 | ); |
97 | } else { | |
98 | /* small block: don't clobber ecx + smaller code */ | |
78d64fc2 JP |
99 | if (n >= 4 * 4) |
100 | asm volatile("movsl" | |
101 | : "=&D"(edi), "=&S"(esi) | |
102 | : "0"(edi), "1"(esi) | |
103 | : "memory"); | |
104 | if (n >= 3 * 4) | |
105 | asm volatile("movsl" | |
106 | : "=&D"(edi), "=&S"(esi) | |
107 | : "0"(edi), "1"(esi) | |
108 | : "memory"); | |
109 | if (n >= 2 * 4) | |
110 | asm volatile("movsl" | |
111 | : "=&D"(edi), "=&S"(esi) | |
112 | : "0"(edi), "1"(esi) | |
113 | : "memory"); | |
114 | if (n >= 1 * 4) | |
115 | asm volatile("movsl" | |
116 | : "=&D"(edi), "=&S"(esi) | |
117 | : "0"(edi), "1"(esi) | |
118 | : "memory"); | |
d5b63d78 | 119 | } |
1da177e4 | 120 | switch (n % 4) { |
d5b63d78 | 121 | /* tail */ |
78d64fc2 JP |
122 | case 0: |
123 | return to; | |
124 | case 1: | |
125 | asm volatile("movsb" | |
126 | : "=&D"(edi), "=&S"(esi) | |
127 | : "0"(edi), "1"(esi) | |
128 | : "memory"); | |
129 | return to; | |
130 | case 2: | |
131 | asm volatile("movsw" | |
132 | : "=&D"(edi), "=&S"(esi) | |
133 | : "0"(edi), "1"(esi) | |
134 | : "memory"); | |
135 | return to; | |
136 | default: | |
137 | asm volatile("movsw\n\tmovsb" | |
138 | : "=&D"(edi), "=&S"(esi) | |
139 | : "0"(edi), "1"(esi) | |
140 | : "memory"); | |
141 | return to; | |
1da177e4 LT |
142 | } |
143 | } | |
1da177e4 LT |
144 | |
145 | #define __HAVE_ARCH_MEMCPY | |
146 | ||
147 | #ifdef CONFIG_X86_USE_3DNOW | |
148 | ||
149 | #include <asm/mmx.h> | |
150 | ||
151 | /* | |
152 | * This CPU favours 3DNow strongly (eg AMD Athlon) | |
153 | */ | |
154 | ||
78d64fc2 | 155 | static inline void *__constant_memcpy3d(void *to, const void *from, size_t len) |
1da177e4 LT |
156 | { |
157 | if (len < 512) | |
158 | return __constant_memcpy(to, from, len); | |
159 | return _mmx_memcpy(to, from, len); | |
160 | } | |
161 | ||
78d64fc2 | 162 | static inline void *__memcpy3d(void *to, const void *from, size_t len) |
1da177e4 LT |
163 | { |
164 | if (len < 512) | |
165 | return __memcpy(to, from, len); | |
166 | return _mmx_memcpy(to, from, len); | |
167 | } | |
168 | ||
78d64fc2 JP |
169 | #define memcpy(t, f, n) \ |
170 | (__builtin_constant_p((n)) \ | |
171 | ? __constant_memcpy3d((t), (f), (n)) \ | |
172 | : __memcpy3d((t), (f), (n))) | |
1da177e4 LT |
173 | |
174 | #else | |
175 | ||
176 | /* | |
177 | * No 3D Now! | |
178 | */ | |
78d64fc2 JP |
179 | |
180 | #define memcpy(t, f, n) \ | |
181 | (__builtin_constant_p((n)) \ | |
182 | ? __constant_memcpy((t), (f), (n)) \ | |
183 | : __memcpy((t), (f), (n))) | |
1da177e4 LT |
184 | |
185 | #endif | |
186 | ||
187 | #define __HAVE_ARCH_MEMMOVE | |
78d64fc2 | 188 | void *memmove(void *dest, const void *src, size_t n); |
1da177e4 LT |
189 | |
190 | #define memcmp __builtin_memcmp | |
191 | ||
192 | #define __HAVE_ARCH_MEMCHR | |
78d64fc2 | 193 | extern void *memchr(const void *cs, int c, size_t count); |
1da177e4 | 194 | |
78d64fc2 | 195 | static inline void *__memset_generic(void *s, char c, size_t count) |
1da177e4 | 196 | { |
78d64fc2 JP |
197 | int d0, d1; |
198 | asm volatile("rep\n\t" | |
199 | "stosb" | |
200 | : "=&c" (d0), "=&D" (d1) | |
201 | : "a" (c), "1" (s), "0" (count) | |
202 | : "memory"); | |
203 | return s; | |
1da177e4 LT |
204 | } |
205 | ||
206 | /* we might want to write optimized versions of these later */ | |
78d64fc2 | 207 | #define __constant_count_memset(s, c, count) __memset_generic((s), (c), (count)) |
1da177e4 LT |
208 | |
209 | /* | |
78d64fc2 | 210 | * memset(x, 0, y) is a reasonably common thing to do, so we want to fill |
1da177e4 LT |
211 | * things 32 bits at a time even when we don't know the size of the |
212 | * area at compile-time.. | |
213 | */ | |
78d64fc2 JP |
214 | static __always_inline |
215 | void *__constant_c_memset(void *s, unsigned long c, size_t count) | |
1da177e4 | 216 | { |
78d64fc2 JP |
217 | int d0, d1; |
218 | asm volatile("rep ; stosl\n\t" | |
219 | "testb $2,%b3\n\t" | |
220 | "je 1f\n\t" | |
221 | "stosw\n" | |
222 | "1:\ttestb $1,%b3\n\t" | |
223 | "je 2f\n\t" | |
224 | "stosb\n" | |
225 | "2:" | |
226 | : "=&c" (d0), "=&D" (d1) | |
227 | : "a" (c), "q" (count), "0" (count/4), "1" ((long)s) | |
228 | : "memory"); | |
229 | return s; | |
1da177e4 LT |
230 | } |
231 | ||
232 | /* Added by Gertjan van Wingerde to make minix and sysv module work */ | |
233 | #define __HAVE_ARCH_STRNLEN | |
78d64fc2 | 234 | extern size_t strnlen(const char *s, size_t count); |
1da177e4 LT |
235 | /* end of additional stuff */ |
236 | ||
237 | #define __HAVE_ARCH_STRSTR | |
1da177e4 LT |
238 | extern char *strstr(const char *cs, const char *ct); |
239 | ||
240 | /* | |
241 | * This looks horribly ugly, but the compiler can optimize it totally, | |
242 | * as we by now know that both pattern and count is constant.. | |
243 | */ | |
78d64fc2 JP |
244 | static __always_inline |
245 | void *__constant_c_and_count_memset(void *s, unsigned long pattern, | |
246 | size_t count) | |
1da177e4 LT |
247 | { |
248 | switch (count) { | |
78d64fc2 JP |
249 | case 0: |
250 | return s; | |
251 | case 1: | |
252 | *(unsigned char *)s = pattern & 0xff; | |
253 | return s; | |
254 | case 2: | |
255 | *(unsigned short *)s = pattern & 0xffff; | |
256 | return s; | |
257 | case 3: | |
258 | *(unsigned short *)s = pattern & 0xffff; | |
259 | *((unsigned char *)s + 2) = pattern & 0xff; | |
260 | return s; | |
261 | case 4: | |
262 | *(unsigned long *)s = pattern; | |
263 | return s; | |
264 | } | |
265 | ||
266 | #define COMMON(x) \ | |
267 | asm volatile("rep ; stosl" \ | |
268 | x \ | |
269 | : "=&c" (d0), "=&D" (d1) \ | |
1a20d3ec | 270 | : "a" (eax), "0" (count/4), "1" ((long)s) \ |
78d64fc2 JP |
271 | : "memory") |
272 | ||
273 | { | |
274 | int d0, d1; | |
1a20d3ec PA |
275 | #if __GNUC__ == 4 && __GNUC_MINOR__ == 0 |
276 | /* Workaround for broken gcc 4.0 */ | |
277 | register unsigned long eax asm("%eax") = pattern; | |
278 | #else | |
279 | unsigned long eax = pattern; | |
280 | #endif | |
281 | ||
78d64fc2 | 282 | switch (count % 4) { |
1da177e4 | 283 | case 0: |
78d64fc2 | 284 | COMMON(""); |
1da177e4 LT |
285 | return s; |
286 | case 1: | |
78d64fc2 | 287 | COMMON("\n\tstosb"); |
1da177e4 LT |
288 | return s; |
289 | case 2: | |
78d64fc2 | 290 | COMMON("\n\tstosw"); |
1da177e4 | 291 | return s; |
78d64fc2 JP |
292 | default: |
293 | COMMON("\n\tstosw\n\tstosb"); | |
1da177e4 | 294 | return s; |
78d64fc2 | 295 | } |
1da177e4 | 296 | } |
78d64fc2 | 297 | |
1da177e4 LT |
298 | #undef COMMON |
299 | } | |
300 | ||
78d64fc2 JP |
301 | #define __constant_c_x_memset(s, c, count) \ |
302 | (__builtin_constant_p(count) \ | |
303 | ? __constant_c_and_count_memset((s), (c), (count)) \ | |
304 | : __constant_c_memset((s), (c), (count))) | |
1da177e4 | 305 | |
78d64fc2 JP |
306 | #define __memset(s, c, count) \ |
307 | (__builtin_constant_p(count) \ | |
308 | ? __constant_count_memset((s), (c), (count)) \ | |
309 | : __memset_generic((s), (c), (count))) | |
1da177e4 LT |
310 | |
311 | #define __HAVE_ARCH_MEMSET | |
78d64fc2 JP |
312 | #define memset(s, c, count) \ |
313 | (__builtin_constant_p(c) \ | |
314 | ? __constant_c_x_memset((s), (0x01010101UL * (unsigned char)(c)), \ | |
315 | (count)) \ | |
316 | : __memset((s), (c), (count))) | |
1da177e4 LT |
317 | |
318 | /* | |
319 | * find the first occurrence of byte 'c', or 1 past the area if none | |
320 | */ | |
321 | #define __HAVE_ARCH_MEMSCAN | |
78d64fc2 | 322 | extern void *memscan(void *addr, int c, size_t size); |
1da177e4 LT |
323 | |
324 | #endif /* __KERNEL__ */ | |
325 | ||
326 | #endif |