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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_STRING_32_H #define _ASM_X86_STRING_32_H #ifdef __KERNEL__ /* Let gcc decide whether to inline or use the out of line functions */ #define __HAVE_ARCH_STRCPY extern char *strcpy(char *dest, const char *src); #define __HAVE_ARCH_STRNCPY extern char *strncpy(char *dest, const char *src, size_t count); #define __HAVE_ARCH_STRCAT extern char *strcat(char *dest, const char *src); #define __HAVE_ARCH_STRNCAT extern char *strncat(char *dest, const char *src, size_t count); #define __HAVE_ARCH_STRCMP extern int strcmp(const char *cs, const char *ct); #define __HAVE_ARCH_STRNCMP extern int strncmp(const char *cs, const char *ct, size_t count); #define __HAVE_ARCH_STRCHR extern char *strchr(const char *s, int c); #define __HAVE_ARCH_STRLEN extern size_t strlen(const char *s); static __always_inline void *__memcpy(void *to, const void *from, size_t n) { int d0, d1, d2; asm volatile("rep ; movsl\n\t" "movl %4,%%ecx\n\t" "andl $3,%%ecx\n\t" "jz 1f\n\t" "rep ; movsb\n\t" "1:" : "=&c" (d0), "=&D" (d1), "=&S" (d2) : "0" (n / 4), "g" (n), "1" ((long)to), "2" ((long)from) : "memory"); return to; } /* * This looks ugly, but the compiler can optimize it totally, * as the count is constant. */ static __always_inline void *__constant_memcpy(void *to, const void *from, size_t n) { long esi, edi; if (!n) return to; switch (n) { case 1: *(char *)to = *(char *)from; return to; case 2: *(short *)to = *(short *)from; return to; case 4: *(int *)to = *(int *)from; return to; case 3: *(short *)to = *(short *)from; *((char *)to + 2) = *((char *)from + 2); return to; case 5: *(int *)to = *(int *)from; *((char *)to + 4) = *((char *)from + 4); return to; case 6: *(int *)to = *(int *)from; *((short *)to + 2) = *((short *)from + 2); return to; case 8: *(int *)to = *(int *)from; *((int *)to + 1) = *((int *)from + 1); return to; } esi = (long)from; edi = (long)to; if (n >= 5 * 4) { /* large block: use rep prefix */ int ecx; asm volatile("rep ; movsl" : "=&c" (ecx), "=&D" (edi), "=&S" (esi) : "0" (n / 4), "1" (edi), "2" (esi) : "memory" ); } else { /* small block: don't clobber ecx + smaller code */ if (n >= 4 * 4) asm volatile("movsl" : "=&D"(edi), "=&S"(esi) : "0"(edi), "1"(esi) : "memory"); if (n >= 3 * 4) asm volatile("movsl" : "=&D"(edi), "=&S"(esi) : "0"(edi), "1"(esi) : "memory"); if (n >= 2 * 4) asm volatile("movsl" : "=&D"(edi), "=&S"(esi) : "0"(edi), "1"(esi) : "memory"); if (n >= 1 * 4) asm volatile("movsl" : "=&D"(edi), "=&S"(esi) : "0"(edi), "1"(esi) : "memory"); } switch (n % 4) { /* tail */ case 0: return to; case 1: asm volatile("movsb" : "=&D"(edi), "=&S"(esi) : "0"(edi), "1"(esi) : "memory"); return to; case 2: asm volatile("movsw" : "=&D"(edi), "=&S"(esi) : "0"(edi), "1"(esi) : "memory"); return to; default: asm volatile("movsw\n\tmovsb" : "=&D"(edi), "=&S"(esi) : "0"(edi), "1"(esi) : "memory"); return to; } } #define __HAVE_ARCH_MEMCPY extern void *memcpy(void *, const void *, size_t); #ifndef CONFIG_FORTIFY_SOURCE #ifdef CONFIG_X86_USE_3DNOW #include <asm/mmx.h> /* * This CPU favours 3DNow strongly (eg AMD Athlon) */ static inline void *__constant_memcpy3d(void *to, const void *from, size_t len) { if (len < 512) return __constant_memcpy(to, from, len); return _mmx_memcpy(to, from, len); } static inline void *__memcpy3d(void *to, const void *from, size_t len) { if (len < 512) return __memcpy(to, from, len); return _mmx_memcpy(to, from, len); } #define memcpy(t, f, n) \ (__builtin_constant_p((n)) \ ? __constant_memcpy3d((t), (f), (n)) \ : __memcpy3d((t), (f), (n))) #else /* * No 3D Now! */ #define memcpy(t, f, n) __builtin_memcpy(t, f, n) #endif #endif /* !CONFIG_FORTIFY_SOURCE */ #define __HAVE_ARCH_MEMMOVE void *memmove(void *dest, const void *src, size_t n); extern int memcmp(const void *, const void *, size_t); #ifndef CONFIG_FORTIFY_SOURCE #define memcmp __builtin_memcmp #endif #define __HAVE_ARCH_MEMCHR extern void *memchr(const void *cs, int c, size_t count); static inline void *__memset_generic(void *s, char c, size_t count) { int d0, d1; asm volatile("rep\n\t" "stosb" : "=&c" (d0), "=&D" (d1) : "a" (c), "1" (s), "0" (count) : "memory"); return s; } /* we might want to write optimized versions of these later */ #define __constant_count_memset(s, c, count) __memset_generic((s), (c), (count)) /* Added by Gertjan van Wingerde to make minix and sysv module work */ #define __HAVE_ARCH_STRNLEN extern size_t strnlen(const char *s, size_t count); /* end of additional stuff */ #define __HAVE_ARCH_STRSTR extern char *strstr(const char *cs, const char *ct); #define __memset(s, c, count) \ (__builtin_constant_p(count) \ ? __constant_count_memset((s), (c), (count)) \ : __memset_generic((s), (c), (count))) #define __HAVE_ARCH_MEMSET extern void *memset(void *, int, size_t); #ifndef CONFIG_FORTIFY_SOURCE #define memset(s, c, count) __builtin_memset(s, c, count) #endif /* !CONFIG_FORTIFY_SOURCE */ #define __HAVE_ARCH_MEMSET16 static inline void *memset16(uint16_t *s, uint16_t v, size_t n) { int d0, d1; asm volatile("rep\n\t" "stosw" : "=&c" (d0), "=&D" (d1) : "a" (v), "1" (s), "0" (n) : "memory"); return s; } #define __HAVE_ARCH_MEMSET32 static inline void *memset32(uint32_t *s, uint32_t v, size_t n) { int d0, d1; asm volatile("rep\n\t" "stosl" : "=&c" (d0), "=&D" (d1) : "a" (v), "1" (s), "0" (n) : "memory"); return s; } /* * find the first occurrence of byte 'c', or 1 past the area if none */ #define __HAVE_ARCH_MEMSCAN extern void *memscan(void *addr, int c, size_t size); #endif /* __KERNEL__ */ #endif /* _ASM_X86_STRING_32_H */
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