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1da177e4 LT |
1 | #ifndef _I386_STRING_H_ |
2 | #define _I386_STRING_H_ | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | #include <linux/config.h> | |
6 | /* | |
7 | * On a 486 or Pentium, we are better off not using the | |
8 | * byte string operations. But on a 386 or a PPro the | |
9 | * byte string ops are faster than doing it by hand | |
10 | * (MUCH faster on a Pentium). | |
11 | */ | |
12 | ||
13 | /* | |
14 | * This string-include defines all string functions as inline | |
15 | * functions. Use gcc. It also assumes ds=es=data space, this should be | |
16 | * normal. Most of the string-functions are rather heavily hand-optimized, | |
17 | * see especially strsep,strstr,str[c]spn. They should work, but are not | |
18 | * very easy to understand. Everything is done entirely within the register | |
19 | * set, making the functions fast and clean. String instructions have been | |
20 | * used through-out, making for "slightly" unclear code :-) | |
21 | * | |
22 | * NO Copyright (C) 1991, 1992 Linus Torvalds, | |
23 | * consider these trivial functions to be PD. | |
24 | */ | |
25 | ||
26 | /* AK: in fact I bet it would be better to move this stuff all out of line. | |
27 | */ | |
28 | ||
29 | #define __HAVE_ARCH_STRCPY | |
30 | static inline char * strcpy(char * dest,const char *src) | |
31 | { | |
32 | int d0, d1, d2; | |
33 | __asm__ __volatile__( | |
34 | "1:\tlodsb\n\t" | |
35 | "stosb\n\t" | |
36 | "testb %%al,%%al\n\t" | |
37 | "jne 1b" | |
38 | : "=&S" (d0), "=&D" (d1), "=&a" (d2) | |
39 | :"0" (src),"1" (dest) : "memory"); | |
40 | return dest; | |
41 | } | |
42 | ||
43 | #define __HAVE_ARCH_STRNCPY | |
44 | static inline char * strncpy(char * dest,const char *src,size_t count) | |
45 | { | |
46 | int d0, d1, d2, d3; | |
47 | __asm__ __volatile__( | |
48 | "1:\tdecl %2\n\t" | |
49 | "js 2f\n\t" | |
50 | "lodsb\n\t" | |
51 | "stosb\n\t" | |
52 | "testb %%al,%%al\n\t" | |
53 | "jne 1b\n\t" | |
54 | "rep\n\t" | |
55 | "stosb\n" | |
56 | "2:" | |
57 | : "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3) | |
58 | :"0" (src),"1" (dest),"2" (count) : "memory"); | |
59 | return dest; | |
60 | } | |
61 | ||
62 | #define __HAVE_ARCH_STRCAT | |
63 | static inline char * strcat(char * dest,const char * src) | |
64 | { | |
65 | int d0, d1, d2, d3; | |
66 | __asm__ __volatile__( | |
67 | "repne\n\t" | |
68 | "scasb\n\t" | |
69 | "decl %1\n" | |
70 | "1:\tlodsb\n\t" | |
71 | "stosb\n\t" | |
72 | "testb %%al,%%al\n\t" | |
73 | "jne 1b" | |
74 | : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3) | |
75 | : "0" (src), "1" (dest), "2" (0), "3" (0xffffffffu):"memory"); | |
76 | return dest; | |
77 | } | |
78 | ||
79 | #define __HAVE_ARCH_STRNCAT | |
80 | static inline char * strncat(char * dest,const char * src,size_t count) | |
81 | { | |
82 | int d0, d1, d2, d3; | |
83 | __asm__ __volatile__( | |
84 | "repne\n\t" | |
85 | "scasb\n\t" | |
86 | "decl %1\n\t" | |
87 | "movl %8,%3\n" | |
88 | "1:\tdecl %3\n\t" | |
89 | "js 2f\n\t" | |
90 | "lodsb\n\t" | |
91 | "stosb\n\t" | |
92 | "testb %%al,%%al\n\t" | |
93 | "jne 1b\n" | |
94 | "2:\txorl %2,%2\n\t" | |
95 | "stosb" | |
96 | : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3) | |
97 | : "0" (src),"1" (dest),"2" (0),"3" (0xffffffffu), "g" (count) | |
98 | : "memory"); | |
99 | return dest; | |
100 | } | |
101 | ||
102 | #define __HAVE_ARCH_STRCMP | |
103 | static inline int strcmp(const char * cs,const char * ct) | |
104 | { | |
105 | int d0, d1; | |
106 | register int __res; | |
107 | __asm__ __volatile__( | |
108 | "1:\tlodsb\n\t" | |
109 | "scasb\n\t" | |
110 | "jne 2f\n\t" | |
111 | "testb %%al,%%al\n\t" | |
112 | "jne 1b\n\t" | |
113 | "xorl %%eax,%%eax\n\t" | |
114 | "jmp 3f\n" | |
115 | "2:\tsbbl %%eax,%%eax\n\t" | |
116 | "orb $1,%%al\n" | |
117 | "3:" | |
118 | :"=a" (__res), "=&S" (d0), "=&D" (d1) | |
119 | :"1" (cs),"2" (ct)); | |
120 | return __res; | |
121 | } | |
122 | ||
123 | #define __HAVE_ARCH_STRNCMP | |
124 | static inline int strncmp(const char * cs,const char * ct,size_t count) | |
125 | { | |
126 | register int __res; | |
127 | int d0, d1, d2; | |
128 | __asm__ __volatile__( | |
129 | "1:\tdecl %3\n\t" | |
130 | "js 2f\n\t" | |
131 | "lodsb\n\t" | |
132 | "scasb\n\t" | |
133 | "jne 3f\n\t" | |
134 | "testb %%al,%%al\n\t" | |
135 | "jne 1b\n" | |
136 | "2:\txorl %%eax,%%eax\n\t" | |
137 | "jmp 4f\n" | |
138 | "3:\tsbbl %%eax,%%eax\n\t" | |
139 | "orb $1,%%al\n" | |
140 | "4:" | |
141 | :"=a" (__res), "=&S" (d0), "=&D" (d1), "=&c" (d2) | |
142 | :"1" (cs),"2" (ct),"3" (count)); | |
143 | return __res; | |
144 | } | |
145 | ||
146 | #define __HAVE_ARCH_STRCHR | |
147 | static inline char * strchr(const char * s, int c) | |
148 | { | |
149 | int d0; | |
150 | register char * __res; | |
151 | __asm__ __volatile__( | |
152 | "movb %%al,%%ah\n" | |
153 | "1:\tlodsb\n\t" | |
154 | "cmpb %%ah,%%al\n\t" | |
155 | "je 2f\n\t" | |
156 | "testb %%al,%%al\n\t" | |
157 | "jne 1b\n\t" | |
158 | "movl $1,%1\n" | |
159 | "2:\tmovl %1,%0\n\t" | |
160 | "decl %0" | |
161 | :"=a" (__res), "=&S" (d0) : "1" (s),"0" (c)); | |
162 | return __res; | |
163 | } | |
164 | ||
165 | #define __HAVE_ARCH_STRRCHR | |
166 | static inline char * strrchr(const char * s, int c) | |
167 | { | |
168 | int d0, d1; | |
169 | register char * __res; | |
170 | __asm__ __volatile__( | |
171 | "movb %%al,%%ah\n" | |
172 | "1:\tlodsb\n\t" | |
173 | "cmpb %%ah,%%al\n\t" | |
174 | "jne 2f\n\t" | |
175 | "leal -1(%%esi),%0\n" | |
176 | "2:\ttestb %%al,%%al\n\t" | |
177 | "jne 1b" | |
178 | :"=g" (__res), "=&S" (d0), "=&a" (d1) :"0" (0),"1" (s),"2" (c)); | |
179 | return __res; | |
180 | } | |
181 | ||
182 | #define __HAVE_ARCH_STRLEN | |
183 | static inline size_t strlen(const char * s) | |
184 | { | |
185 | int d0; | |
186 | register int __res; | |
187 | __asm__ __volatile__( | |
188 | "repne\n\t" | |
189 | "scasb\n\t" | |
190 | "notl %0\n\t" | |
191 | "decl %0" | |
192 | :"=c" (__res), "=&D" (d0) :"1" (s),"a" (0), "0" (0xffffffffu)); | |
193 | return __res; | |
194 | } | |
195 | ||
196 | static inline void * __memcpy(void * to, const void * from, size_t n) | |
197 | { | |
198 | int d0, d1, d2; | |
199 | __asm__ __volatile__( | |
200 | "rep ; movsl\n\t" | |
201 | "testb $2,%b4\n\t" | |
202 | "je 1f\n\t" | |
203 | "movsw\n" | |
204 | "1:\ttestb $1,%b4\n\t" | |
205 | "je 2f\n\t" | |
206 | "movsb\n" | |
207 | "2:" | |
208 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) | |
209 | :"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from) | |
210 | : "memory"); | |
211 | return (to); | |
212 | } | |
213 | ||
214 | /* | |
215 | * This looks horribly ugly, but the compiler can optimize it totally, | |
216 | * as the count is constant. | |
217 | */ | |
218 | static inline void * __constant_memcpy(void * to, const void * from, size_t n) | |
219 | { | |
220 | if (n <= 128) | |
221 | return __builtin_memcpy(to, from, n); | |
222 | ||
223 | #define COMMON(x) \ | |
224 | __asm__ __volatile__( \ | |
225 | "rep ; movsl" \ | |
226 | x \ | |
227 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) \ | |
228 | : "0" (n/4),"1" ((long) to),"2" ((long) from) \ | |
229 | : "memory"); | |
230 | { | |
231 | int d0, d1, d2; | |
232 | switch (n % 4) { | |
233 | case 0: COMMON(""); return to; | |
234 | case 1: COMMON("\n\tmovsb"); return to; | |
235 | case 2: COMMON("\n\tmovsw"); return to; | |
236 | default: COMMON("\n\tmovsw\n\tmovsb"); return to; | |
237 | } | |
238 | } | |
239 | ||
240 | #undef COMMON | |
241 | } | |
242 | ||
243 | #define __HAVE_ARCH_MEMCPY | |
244 | ||
245 | #ifdef CONFIG_X86_USE_3DNOW | |
246 | ||
247 | #include <asm/mmx.h> | |
248 | ||
249 | /* | |
250 | * This CPU favours 3DNow strongly (eg AMD Athlon) | |
251 | */ | |
252 | ||
253 | static inline void * __constant_memcpy3d(void * to, const void * from, size_t len) | |
254 | { | |
255 | if (len < 512) | |
256 | return __constant_memcpy(to, from, len); | |
257 | return _mmx_memcpy(to, from, len); | |
258 | } | |
259 | ||
260 | static __inline__ void *__memcpy3d(void *to, const void *from, size_t len) | |
261 | { | |
262 | if (len < 512) | |
263 | return __memcpy(to, from, len); | |
264 | return _mmx_memcpy(to, from, len); | |
265 | } | |
266 | ||
267 | #define memcpy(t, f, n) \ | |
268 | (__builtin_constant_p(n) ? \ | |
269 | __constant_memcpy3d((t),(f),(n)) : \ | |
270 | __memcpy3d((t),(f),(n))) | |
271 | ||
272 | #else | |
273 | ||
274 | /* | |
275 | * No 3D Now! | |
276 | */ | |
277 | ||
278 | #define memcpy(t, f, n) \ | |
279 | (__builtin_constant_p(n) ? \ | |
280 | __constant_memcpy((t),(f),(n)) : \ | |
281 | __memcpy((t),(f),(n))) | |
282 | ||
283 | #endif | |
284 | ||
285 | #define __HAVE_ARCH_MEMMOVE | |
286 | void *memmove(void * dest,const void * src, size_t n); | |
287 | ||
288 | #define memcmp __builtin_memcmp | |
289 | ||
290 | #define __HAVE_ARCH_MEMCHR | |
291 | static inline void * memchr(const void * cs,int c,size_t count) | |
292 | { | |
293 | int d0; | |
294 | register void * __res; | |
295 | if (!count) | |
296 | return NULL; | |
297 | __asm__ __volatile__( | |
298 | "repne\n\t" | |
299 | "scasb\n\t" | |
300 | "je 1f\n\t" | |
301 | "movl $1,%0\n" | |
302 | "1:\tdecl %0" | |
303 | :"=D" (__res), "=&c" (d0) : "a" (c),"0" (cs),"1" (count)); | |
304 | return __res; | |
305 | } | |
306 | ||
307 | static inline void * __memset_generic(void * s, char c,size_t count) | |
308 | { | |
309 | int d0, d1; | |
310 | __asm__ __volatile__( | |
311 | "rep\n\t" | |
312 | "stosb" | |
313 | : "=&c" (d0), "=&D" (d1) | |
314 | :"a" (c),"1" (s),"0" (count) | |
315 | :"memory"); | |
316 | return s; | |
317 | } | |
318 | ||
319 | /* we might want to write optimized versions of these later */ | |
320 | #define __constant_count_memset(s,c,count) __memset_generic((s),(c),(count)) | |
321 | ||
322 | /* | |
323 | * memset(x,0,y) is a reasonably common thing to do, so we want to fill | |
324 | * things 32 bits at a time even when we don't know the size of the | |
325 | * area at compile-time.. | |
326 | */ | |
327 | static inline void * __constant_c_memset(void * s, unsigned long c, size_t count) | |
328 | { | |
329 | int d0, d1; | |
330 | __asm__ __volatile__( | |
331 | "rep ; stosl\n\t" | |
332 | "testb $2,%b3\n\t" | |
333 | "je 1f\n\t" | |
334 | "stosw\n" | |
335 | "1:\ttestb $1,%b3\n\t" | |
336 | "je 2f\n\t" | |
337 | "stosb\n" | |
338 | "2:" | |
339 | : "=&c" (d0), "=&D" (d1) | |
340 | :"a" (c), "q" (count), "0" (count/4), "1" ((long) s) | |
341 | :"memory"); | |
342 | return (s); | |
343 | } | |
344 | ||
345 | /* Added by Gertjan van Wingerde to make minix and sysv module work */ | |
346 | #define __HAVE_ARCH_STRNLEN | |
347 | static inline size_t strnlen(const char * s, size_t count) | |
348 | { | |
349 | int d0; | |
350 | register int __res; | |
351 | __asm__ __volatile__( | |
352 | "movl %2,%0\n\t" | |
353 | "jmp 2f\n" | |
354 | "1:\tcmpb $0,(%0)\n\t" | |
355 | "je 3f\n\t" | |
356 | "incl %0\n" | |
357 | "2:\tdecl %1\n\t" | |
358 | "cmpl $-1,%1\n\t" | |
359 | "jne 1b\n" | |
360 | "3:\tsubl %2,%0" | |
361 | :"=a" (__res), "=&d" (d0) | |
362 | :"c" (s),"1" (count)); | |
363 | return __res; | |
364 | } | |
365 | /* end of additional stuff */ | |
366 | ||
367 | #define __HAVE_ARCH_STRSTR | |
368 | ||
369 | extern char *strstr(const char *cs, const char *ct); | |
370 | ||
371 | /* | |
372 | * This looks horribly ugly, but the compiler can optimize it totally, | |
373 | * as we by now know that both pattern and count is constant.. | |
374 | */ | |
375 | static inline void * __constant_c_and_count_memset(void * s, unsigned long pattern, size_t count) | |
376 | { | |
377 | switch (count) { | |
378 | case 0: | |
379 | return s; | |
380 | case 1: | |
381 | *(unsigned char *)s = pattern; | |
382 | return s; | |
383 | case 2: | |
384 | *(unsigned short *)s = pattern; | |
385 | return s; | |
386 | case 3: | |
387 | *(unsigned short *)s = pattern; | |
388 | *(2+(unsigned char *)s) = pattern; | |
389 | return s; | |
390 | case 4: | |
391 | *(unsigned long *)s = pattern; | |
392 | return s; | |
393 | } | |
394 | #define COMMON(x) \ | |
395 | __asm__ __volatile__( \ | |
396 | "rep ; stosl" \ | |
397 | x \ | |
398 | : "=&c" (d0), "=&D" (d1) \ | |
399 | : "a" (pattern),"0" (count/4),"1" ((long) s) \ | |
400 | : "memory") | |
401 | { | |
402 | int d0, d1; | |
403 | switch (count % 4) { | |
404 | case 0: COMMON(""); return s; | |
405 | case 1: COMMON("\n\tstosb"); return s; | |
406 | case 2: COMMON("\n\tstosw"); return s; | |
407 | default: COMMON("\n\tstosw\n\tstosb"); return s; | |
408 | } | |
409 | } | |
410 | ||
411 | #undef COMMON | |
412 | } | |
413 | ||
414 | #define __constant_c_x_memset(s, c, count) \ | |
415 | (__builtin_constant_p(count) ? \ | |
416 | __constant_c_and_count_memset((s),(c),(count)) : \ | |
417 | __constant_c_memset((s),(c),(count))) | |
418 | ||
419 | #define __memset(s, c, count) \ | |
420 | (__builtin_constant_p(count) ? \ | |
421 | __constant_count_memset((s),(c),(count)) : \ | |
422 | __memset_generic((s),(c),(count))) | |
423 | ||
424 | #define __HAVE_ARCH_MEMSET | |
425 | #define memset(s, c, count) \ | |
426 | (__builtin_constant_p(c) ? \ | |
427 | __constant_c_x_memset((s),(0x01010101UL*(unsigned char)(c)),(count)) : \ | |
428 | __memset((s),(c),(count))) | |
429 | ||
430 | /* | |
431 | * find the first occurrence of byte 'c', or 1 past the area if none | |
432 | */ | |
433 | #define __HAVE_ARCH_MEMSCAN | |
434 | static inline void * memscan(void * addr, int c, size_t size) | |
435 | { | |
436 | if (!size) | |
437 | return addr; | |
438 | __asm__("repnz; scasb\n\t" | |
439 | "jnz 1f\n\t" | |
440 | "dec %%edi\n" | |
441 | "1:" | |
442 | : "=D" (addr), "=c" (size) | |
443 | : "0" (addr), "1" (size), "a" (c)); | |
444 | return addr; | |
445 | } | |
446 | ||
447 | #endif /* __KERNEL__ */ | |
448 | ||
449 | #endif |