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