1 #ifndef _ASM_X86_STRING_32_H
2 #define _ASM_X86_STRING_32_H
6 /* Let gcc decide whether to inline or use the out of line functions */
8 #define __HAVE_ARCH_STRCPY
9 extern char *strcpy(char *dest, const char *src);
11 #define __HAVE_ARCH_STRNCPY
12 extern char *strncpy(char *dest, const char *src, size_t count);
14 #define __HAVE_ARCH_STRCAT
15 extern char *strcat(char *dest, const char *src);
17 #define __HAVE_ARCH_STRNCAT
18 extern char *strncat(char *dest, const char *src, size_t count);
20 #define __HAVE_ARCH_STRCMP
21 extern int strcmp(const char *cs, const char *ct);
23 #define __HAVE_ARCH_STRNCMP
24 extern int strncmp(const char *cs, const char *ct, size_t count);
26 #define __HAVE_ARCH_STRCHR
27 extern char *strchr(const char *s, int c);
29 #define __HAVE_ARCH_STRLEN
30 extern size_t strlen(const char *s);
32 static __always_inline void *__memcpy(void *to, const void *from, size_t n)
35 asm volatile("rep ; movsl\n\t"
41 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
42 : "0" (n / 4), "g" (n), "1" ((long)to), "2" ((long)from)
48 * This looks ugly, but the compiler can optimize it totally,
49 * as the count is constant.
51 static __always_inline void *__constant_memcpy(void *to, const void *from,
60 *(char *)to = *(char *)from;
63 *(short *)to = *(short *)from;
66 *(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
147 #ifdef CONFIG_X86_USE_3DNOW
152 * This CPU favours 3DNow strongly (eg AMD Athlon)
155 static inline void *__constant_memcpy3d(void *to, const void *from, size_t len)
158 return __constant_memcpy(to, from, len);
159 return _mmx_memcpy(to, from, len);
162 static inline void *__memcpy3d(void *to, const void *from, size_t len)
165 return __memcpy(to, from, len);
166 return _mmx_memcpy(to, from, len);
169 #define memcpy(t, f, n) \
170 (__builtin_constant_p((n)) \
171 ? __constant_memcpy3d((t), (f), (n)) \
172 : __memcpy3d((t), (f), (n)))
180 #ifndef CONFIG_KMEMCHECK
181 #define memcpy(t, f, n) \
182 (__builtin_constant_p((n)) \
183 ? __constant_memcpy((t), (f), (n)) \
184 : __memcpy((t), (f), (n)))
187 * kmemcheck becomes very happy if we use the REP instructions unconditionally,
188 * because it means that we know both memory operands in advance.
190 #define memcpy(t, f, n) __memcpy((t), (f), (n))
195 #define __HAVE_ARCH_MEMMOVE
196 void *memmove(void *dest, const void *src, size_t n);
198 #define memcmp __builtin_memcmp
200 #define __HAVE_ARCH_MEMCHR
201 extern void *memchr(const void *cs, int c, size_t count);
203 static inline void *__memset_generic(void *s, char c, size_t count)
206 asm volatile("rep\n\t"
208 : "=&c" (d0), "=&D" (d1)
209 : "a" (c), "1" (s), "0" (count)
214 /* we might want to write optimized versions of these later */
215 #define __constant_count_memset(s, c, count) __memset_generic((s), (c), (count))
218 * memset(x, 0, y) is a reasonably common thing to do, so we want to fill
219 * things 32 bits at a time even when we don't know the size of the
220 * area at compile-time..
222 static __always_inline
223 void *__constant_c_memset(void *s, unsigned long c, size_t count)
226 asm volatile("rep ; stosl\n\t"
230 "1:\ttestb $1,%b3\n\t"
234 : "=&c" (d0), "=&D" (d1)
235 : "a" (c), "q" (count), "0" (count/4), "1" ((long)s)
240 /* Added by Gertjan van Wingerde to make minix and sysv module work */
241 #define __HAVE_ARCH_STRNLEN
242 extern size_t strnlen(const char *s, size_t count);
243 /* end of additional stuff */
245 #define __HAVE_ARCH_STRSTR
246 extern char *strstr(const char *cs, const char *ct);
249 * This looks horribly ugly, but the compiler can optimize it totally,
250 * as we by now know that both pattern and count is constant..
252 static __always_inline
253 void *__constant_c_and_count_memset(void *s, unsigned long pattern,
260 *(unsigned char *)s = pattern & 0xff;
263 *(unsigned short *)s = pattern & 0xffff;
266 *(unsigned short *)s = pattern & 0xffff;
267 *((unsigned char *)s + 2) = pattern & 0xff;
270 *(unsigned long *)s = pattern;
275 asm volatile("rep ; stosl" \
277 : "=&c" (d0), "=&D" (d1) \
278 : "a" (eax), "0" (count/4), "1" ((long)s) \
283 #if __GNUC__ == 4 && __GNUC_MINOR__ == 0
284 /* Workaround for broken gcc 4.0 */
285 register unsigned long eax asm("%eax") = pattern;
287 unsigned long eax = pattern;
301 COMMON("\n\tstosw\n\tstosb");
309 #define __constant_c_x_memset(s, c, count) \
310 (__builtin_constant_p(count) \
311 ? __constant_c_and_count_memset((s), (c), (count)) \
312 : __constant_c_memset((s), (c), (count)))
314 #define __memset(s, c, count) \
315 (__builtin_constant_p(count) \
316 ? __constant_count_memset((s), (c), (count)) \
317 : __memset_generic((s), (c), (count)))
319 #define __HAVE_ARCH_MEMSET
320 #define memset(s, c, count) \
321 (__builtin_constant_p(c) \
322 ? __constant_c_x_memset((s), (0x01010101UL * (unsigned char)(c)), \
324 : __memset((s), (c), (count)))
327 * find the first occurrence of byte 'c', or 1 past the area if none
329 #define __HAVE_ARCH_MEMSCAN
330 extern void *memscan(void *addr, int c, size_t size);
332 #endif /* __KERNEL__ */
334 #endif /* _ASM_X86_STRING_32_H */