1#ifndef _ASM_X86_STRING_32_H 2#define _ASM_X86_STRING_32_H 3 4#ifdef __KERNEL__ 5 6/* Let gcc decide whether to inline or use the out of line functions */ 7 8#define __HAVE_ARCH_STRCPY 9extern char *strcpy(char *dest, const char *src); 10 11#define __HAVE_ARCH_STRNCPY 12extern char *strncpy(char *dest, const char *src, size_t count); 13 14#define __HAVE_ARCH_STRCAT 15extern char *strcat(char *dest, const char *src); 16 17#define __HAVE_ARCH_STRNCAT 18extern char *strncat(char *dest, const char *src, size_t count); 19 20#define __HAVE_ARCH_STRCMP 21extern int strcmp(const char *cs, const char *ct); 22 23#define __HAVE_ARCH_STRNCMP 24extern int strncmp(const char *cs, const char *ct, size_t count); 25 26#define __HAVE_ARCH_STRCHR 27extern char *strchr(const char *s, int c); 28 29#define __HAVE_ARCH_STRLEN 30extern size_t strlen(const char *s); 31 32static __always_inline void *__memcpy(void *to, const void *from, size_t n) 33{ 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; 45} 46 47/* 48 * This looks ugly, but the compiler can optimize it totally, 49 * as the count is constant. 50 */ 51static __always_inline void *__constant_memcpy(void *to, const void *from, 52 size_t n) 53{ 54 long esi, edi; 55 if (!n) 56 return to; 57 58 switch (n) { 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 case 3: 69 *(short *)to = *(short *)from; 70 *((char *)to + 2) = *((char *)from + 2); 71 return to; 72 case 5: 73 *(int *)to = *(int *)from; 74 *((char *)to + 4) = *((char *)from + 4); 75 return to; 76 case 6: 77 *(int *)to = *(int *)from; 78 *((short *)to + 2) = *((short *)from + 2); 79 return to; 80 case 8: 81 *(int *)to = *(int *)from; 82 *((int *)to + 1) = *((int *)from + 1); 83 return to; 84 } 85 86 esi = (long)from; 87 edi = (long)to; 88 if (n >= 5 * 4) { 89 /* large block: use rep prefix */ 90 int ecx; 91 asm volatile("rep ; movsl" 92 : "=&c" (ecx), "=&D" (edi), "=&S" (esi) 93 : "0" (n / 4), "1" (edi), "2" (esi) 94 : "memory" 95 ); 96 } else { 97 /* small block: don't clobber ecx + smaller code */ 98 if (n >= 4 * 4) 99 asm volatile("movsl" 100 : "=&D"(edi), "=&S"(esi) 101 : "0"(edi), "1"(esi) 102 : "memory"); 103 if (n >= 3 * 4) 104 asm volatile("movsl" 105 : "=&D"(edi), "=&S"(esi) 106 : "0"(edi), "1"(esi) 107 : "memory"); 108 if (n >= 2 * 4) 109 asm volatile("movsl" 110 : "=&D"(edi), "=&S"(esi) 111 : "0"(edi), "1"(esi) 112 : "memory"); 113 if (n >= 1 * 4) 114 asm volatile("movsl" 115 : "=&D"(edi), "=&S"(esi) 116 : "0"(edi), "1"(esi) 117 : "memory"); 118 } 119 switch (n % 4) { 120 /* tail */ 121 case 0: 122 return to; 123 case 1: 124 asm volatile("movsb" 125 : "=&D"(edi), "=&S"(esi) 126 : "0"(edi), "1"(esi) 127 : "memory"); 128 return to; 129 case 2: 130 asm volatile("movsw" 131 : "=&D"(edi), "=&S"(esi) 132 : "0"(edi), "1"(esi) 133 : "memory"); 134 return to; 135 default: 136 asm volatile("movsw\n\tmovsb" 137 : "=&D"(edi), "=&S"(esi) 138 : "0"(edi), "1"(esi) 139 : "memory"); 140 return to; 141 } 142} 143 144#define __HAVE_ARCH_MEMCPY 145 146#ifdef CONFIG_X86_USE_3DNOW 147 148#include <asm/mmx.h> 149 150/* 151 * This CPU favours 3DNow strongly (eg AMD Athlon) 152 */ 153 154static inline void *__constant_memcpy3d(void *to, const void *from, size_t len) 155{ 156 if (len < 512) 157 return __constant_memcpy(to, from, len); 158 return _mmx_memcpy(to, from, len); 159} 160 161static inline void *__memcpy3d(void *to, const void *from, size_t len) 162{ 163 if (len < 512) 164 return __memcpy(to, from, len); 165 return _mmx_memcpy(to, from, len); 166} 167 168#define memcpy(t, f, n) \ 169 (__builtin_constant_p((n)) \ 170 ? __constant_memcpy3d((t), (f), (n)) \ 171 : __memcpy3d((t), (f), (n))) 172 173#else 174 175/* 176 * No 3D Now! 177 */ 178 179#ifndef CONFIG_KMEMCHECK 180 181#if (__GNUC__ >= 4) 182#define memcpy(t, f, n) __builtin_memcpy(t, f, n) 183#else 184#define memcpy(t, f, n) \ 185 (__builtin_constant_p((n)) \ 186 ? __constant_memcpy((t), (f), (n)) \ 187 : __memcpy((t), (f), (n))) 188#endif 189#else 190/* 191 * kmemcheck becomes very happy if we use the REP instructions unconditionally, 192 * because it means that we know both memory operands in advance. 193 */ 194#define memcpy(t, f, n) __memcpy((t), (f), (n)) 195#endif 196 197#endif 198 199#define __HAVE_ARCH_MEMMOVE 200void *memmove(void *dest, const void *src, size_t n); 201 202#define memcmp __builtin_memcmp 203 204#define __HAVE_ARCH_MEMCHR 205extern void *memchr(const void *cs, int c, size_t count); 206 207static inline void *__memset_generic(void *s, char c, size_t count) 208{ 209 int d0, d1; 210 asm volatile("rep\n\t" 211 "stosb" 212 : "=&c" (d0), "=&D" (d1) 213 : "a" (c), "1" (s), "0" (count) 214 : "memory"); 215 return s; 216} 217 218/* we might want to write optimized versions of these later */ 219#define __constant_count_memset(s, c, count) __memset_generic((s), (c), (count)) 220 221/* 222 * memset(x, 0, y) is a reasonably common thing to do, so we want to fill 223 * things 32 bits at a time even when we don't know the size of the 224 * area at compile-time.. 225 */ 226static __always_inline 227void *__constant_c_memset(void *s, unsigned long c, size_t count) 228{ 229 int d0, d1; 230 asm volatile("rep ; stosl\n\t" 231 "testb $2,%b3\n\t" 232 "je 1f\n\t" 233 "stosw\n" 234 "1:\ttestb $1,%b3\n\t" 235 "je 2f\n\t" 236 "stosb\n" 237 "2:" 238 : "=&c" (d0), "=&D" (d1) 239 : "a" (c), "q" (count), "0" (count/4), "1" ((long)s) 240 : "memory"); 241 return s; 242} 243 244/* Added by Gertjan van Wingerde to make minix and sysv module work */ 245#define __HAVE_ARCH_STRNLEN 246extern size_t strnlen(const char *s, size_t count); 247/* end of additional stuff */ 248 249#define __HAVE_ARCH_STRSTR 250extern char *strstr(const char *cs, const char *ct); 251 252/* 253 * This looks horribly ugly, but the compiler can optimize it totally, 254 * as we by now know that both pattern and count is constant.. 255 */ 256static __always_inline 257void *__constant_c_and_count_memset(void *s, unsigned long pattern, 258 size_t count) 259{ 260 switch (count) { 261 case 0: 262 return s; 263 case 1: 264 *(unsigned char *)s = pattern & 0xff; 265 return s; 266 case 2: 267 *(unsigned short *)s = pattern & 0xffff; 268 return s; 269 case 3: 270 *(unsigned short *)s = pattern & 0xffff; 271 *((unsigned char *)s + 2) = pattern & 0xff; 272 return s; 273 case 4: 274 *(unsigned long *)s = pattern; 275 return s; 276 } 277 278#define COMMON(x) \ 279 asm volatile("rep ; stosl" \ 280 x \ 281 : "=&c" (d0), "=&D" (d1) \ 282 : "a" (eax), "0" (count/4), "1" ((long)s) \ 283 : "memory") 284 285 { 286 int d0, d1; 287#if __GNUC__ == 4 && __GNUC_MINOR__ == 0 288 /* Workaround for broken gcc 4.0 */ 289 register unsigned long eax asm("%eax") = pattern; 290#else 291 unsigned long eax = pattern; 292#endif 293 294 switch (count % 4) { 295 case 0: 296 COMMON(""); 297 return s; 298 case 1: 299 COMMON("\n\tstosb"); 300 return s; 301 case 2: 302 COMMON("\n\tstosw"); 303 return s; 304 default: 305 COMMON("\n\tstosw\n\tstosb"); 306 return s; 307 } 308 } 309 310#undef COMMON 311} 312 313#define __constant_c_x_memset(s, c, count) \ 314 (__builtin_constant_p(count) \ 315 ? __constant_c_and_count_memset((s), (c), (count)) \ 316 : __constant_c_memset((s), (c), (count))) 317 318#define __memset(s, c, count) \ 319 (__builtin_constant_p(count) \ 320 ? __constant_count_memset((s), (c), (count)) \ 321 : __memset_generic((s), (c), (count))) 322 323#define __HAVE_ARCH_MEMSET 324#if (__GNUC__ >= 4) 325#define memset(s, c, count) __builtin_memset(s, c, count) 326#else 327#define memset(s, c, count) \ 328 (__builtin_constant_p(c) \ 329 ? __constant_c_x_memset((s), (0x01010101UL * (unsigned char)(c)), \ 330 (count)) \ 331 : __memset((s), (c), (count))) 332#endif 333 334/* 335 * find the first occurrence of byte 'c', or 1 past the area if none 336 */ 337#define __HAVE_ARCH_MEMSCAN 338extern void *memscan(void *addr, int c, size_t size); 339 340#endif /* __KERNEL__ */ 341 342#endif /* _ASM_X86_STRING_32_H */ 343