forked from KolibriOS/kolibrios
511 lines
11 KiB
C
511 lines
11 KiB
C
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#ifndef _I386_STRING_H_
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#define _I386_STRING_H_
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#ifndef STATIC
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#define STATIC static
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#endif
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#ifndef INLINE
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#define INLINE inline
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#endif
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#include<stdlib.h>
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#define __HAVE_ARCH_STRCPY
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STATIC INLINE char * strcpy(char * dest,const char *src)
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{
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int d0, d1, d2;
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__asm__ __volatile__(
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"1:\tlodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b"
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: "=&S" (d0), "=&D" (d1), "=&a" (d2)
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:"0" (src),"1" (dest) : "memory");
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return dest;
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}
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#define __HAVE_ARCH_STRNCPY
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STATIC INLINE char * strncpy(char * dest,const char *src,size_t count)
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{
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int d0, d1, d2, d3;
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__asm__ __volatile__(
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"1:\tdecl %2\n\t"
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"js 2f\n\t"
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"lodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n\t"
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"rep\n\t"
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"stosb\n"
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"2:"
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: "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3)
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:"0" (src),"1" (dest),"2" (count) : "memory");
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return dest;
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}
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#define __HAVE_ARCH_STRCAT
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STATIC INLINE char * strcat(char * dest,const char * src)
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{
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int d0, d1, d2, d3;
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__asm__ __volatile__(
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"repne\n\t"
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"scasb\n\t"
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"decl %1\n"
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"1:\tlodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b"
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: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
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: "0" (src), "1" (dest), "2" (0), "3" (0xffffffff):"memory");
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return dest;
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}
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#define __HAVE_ARCH_STRNCAT
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STATIC INLINE char * strncat(char * dest,const char * src,size_t count)
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{
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int d0, d1, d2, d3;
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__asm__ __volatile__(
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"repne\n\t"
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"scasb\n\t"
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"decl %1\n\t"
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"movl %8,%3\n"
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"1:\tdecl %3\n\t"
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"js 2f\n\t"
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"lodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n"
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"2:\txorl %2,%2\n\t"
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"stosb"
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: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
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: "0" (src),"1" (dest),"2" (0),"3" (0xffffffff), "g" (count)
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: "memory");
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return dest;
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}
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#define __HAVE_ARCH_STRCMP
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STATIC INLINE int strcmp(const char * cs,const char * ct)
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{
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int d0, d1;
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register int __res;
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__asm__ __volatile__(
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"1:\tlodsb\n\t"
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"scasb\n\t"
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"jne 2f\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n\t"
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"xorl %%eax,%%eax\n\t"
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"jmp 3f\n"
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"2:\tsbbl %%eax,%%eax\n\t"
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"orb $1,%%al\n"
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"3:"
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:"=a" (__res), "=&S" (d0), "=&D" (d1)
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:"1" (cs),"2" (ct));
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return __res;
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}
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#define __HAVE_ARCH_STRNCMP
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STATIC INLINE int strncmp(const char * cs,const char * ct,size_t count)
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{
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register int __res;
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int d0, d1, d2;
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__asm__ __volatile__(
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"1:\tdecl %3\n\t"
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"js 2f\n\t"
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"lodsb\n\t"
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"scasb\n\t"
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"jne 3f\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n"
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"2:\txorl %%eax,%%eax\n\t"
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"jmp 4f\n"
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"3:\tsbbl %%eax,%%eax\n\t"
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"orb $1,%%al\n"
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"4:"
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:"=a" (__res), "=&S" (d0), "=&D" (d1), "=&c" (d2)
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:"1" (cs),"2" (ct),"3" (count));
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return __res;
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}
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#define __HAVE_ARCH_STRCHR
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STATIC INLINE char * strchr(const char * s, int c)
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{
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int d0;
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register char * __res;
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__asm__ __volatile__(
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"movb %%al,%%ah\n"
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"1:\tlodsb\n\t"
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"cmpb %%ah,%%al\n\t"
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"je 2f\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n\t"
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"movl $1,%1\n"
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"2:\tmovl %1,%0\n\t"
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"decl %0"
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:"=a" (__res), "=&S" (d0) : "1" (s),"0" (c));
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return __res;
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}
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#define __HAVE_ARCH_STRRCHR
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STATIC INLINE char * strrchr(const char * s, int c)
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{
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int d0, d1;
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register char * __res;
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__asm__ __volatile__(
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"movb %%al,%%ah\n"
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"1:\tlodsb\n\t"
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"cmpb %%ah,%%al\n\t"
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"jne 2f\n\t"
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"leal -1(%%esi),%0\n"
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"2:\ttestb %%al,%%al\n\t"
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"jne 1b"
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:"=g" (__res), "=&S" (d0), "=&a" (d1) :"0" (0),"1" (s),"2" (c));
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return __res;
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}
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#define __HAVE_ARCH_STRLEN
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STATIC INLINE size_t strlen(const char * s)
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{
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int d0;
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register int __res;
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__asm__ __volatile__(
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"repne\n\t"
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"scasb\n\t"
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"notl %0\n\t"
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"decl %0"
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:"=c" (__res), "=&D" (d0) :"1" (s),"a" (0), "0" (0xffffffff));
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return __res;
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}
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static 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__(
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"rep ; movsl\n\t"
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"testb $2,%b4\n\t"
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"je 1f\n\t"
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"movsw\n"
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"1:\ttestb $1,%b4\n\t"
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"je 2f\n\t"
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"movsb\n"
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"2:"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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:"0" (n/4), "q" (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 horribly 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 inline void * __constant_memcpy(void * to, const void * from, size_t n)
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{
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switch (n) {
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case 0:
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return to;
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case 1:
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*(unsigned char *)to = *(const unsigned char *)from;
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return to;
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case 2:
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*(unsigned short *)to = *(const unsigned short *)from;
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return to;
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case 3:
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*(unsigned short *)to = *(const unsigned short *)from;
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*(2+(unsigned char *)to) = *(2+(const unsigned char *)from);
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return to;
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case 4:
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*(unsigned long *)to = *(const unsigned long *)from;
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return to;
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case 6: /* for Ethernet addresses */
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*(unsigned long *)to = *(const unsigned long *)from;
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*(2+(unsigned short *)to) = *(2+(const unsigned short *)from);
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return to;
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case 8:
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*(unsigned long *)to = *(const unsigned long *)from;
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*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
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return to;
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case 12:
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*(unsigned long *)to = *(const unsigned long *)from;
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*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
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*(2+(unsigned long *)to) = *(2+(const unsigned long *)from);
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return to;
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case 16:
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*(unsigned long *)to = *(const unsigned long *)from;
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*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
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*(2+(unsigned long *)to) = *(2+(const unsigned long *)from);
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*(3+(unsigned long *)to) = *(3+(const unsigned long *)from);
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return to;
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case 20:
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*(unsigned long *)to = *(const unsigned long *)from;
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*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
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*(2+(unsigned long *)to) = *(2+(const unsigned long *)from);
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*(3+(unsigned long *)to) = *(3+(const unsigned long *)from);
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*(4+(unsigned long *)to) = *(4+(const unsigned long *)from);
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return to;
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}
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#define COMMON(x) \
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__asm__ __volatile__( \
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"rep ; movsl" \
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x \
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: "=&c" (d0), "=&D" (d1), "=&S" (d2) \
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: "0" (n/4),"1" ((long) to),"2" ((long) from) \
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: "memory");
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{
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int d0, d1, d2;
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switch (n % 4) {
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case 0: COMMON(""); return to;
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case 1: COMMON("\n\tmovsb"); return to;
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case 2: COMMON("\n\tmovsw"); return to;
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default: COMMON("\n\tmovsw\n\tmovsb"); return to;
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}
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}
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#undef COMMON
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}
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#define __HAVE_ARCH_MEMCPY
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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) \
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(__builtin_constant_p(n) ? \
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__constant_memcpy((t),(f),(n)) : \
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__memcpy((t),(f),(n)))
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#endif
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/*
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* struct_cpy(x,y), copy structure *x into (matching structure) *y.
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*
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* We get link-time errors if the structure sizes do not match.
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* There is no runtime overhead, it's all optimized away at
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* compile time.
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*/
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extern void __struct_cpy_bug (void);
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#define struct_cpy(x,y) \
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({ \
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if (sizeof(*(x)) != sizeof(*(y))) \
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__struct_cpy_bug; \
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memcpy(x, y, sizeof(*(x))); \
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})
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#define __HAVE_ARCH_MEMMOVE
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STATIC INLINE void * memmove(void * dest,const void * src, size_t n)
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{
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int d0, d1, d2;
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if (dest<src)
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__asm__ __volatile__(
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"rep\n\t"
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"movsb"
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: "=&c" (d0), "=&S" (d1), "=&D" (d2)
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:"0" (n),"1" (src),"2" (dest)
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: "memory");
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else
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__asm__ __volatile__(
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"std\n\t"
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"rep\n\t"
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"movsb\n\t"
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"cld"
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: "=&c" (d0), "=&S" (d1), "=&D" (d2)
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:"0" (n),
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"1" (n-1+(const char *)src),
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"2" (n-1+(char *)dest)
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:"memory");
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return dest;
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}
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#define memcmp __builtin_memcmp
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#define __HAVE_ARCH_MEMCHR
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STATIC INLINE void * memchr(const void * cs,int c,size_t count)
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{
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int d0;
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register void * __res;
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if (!count)
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return NULL;
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__asm__ __volatile__(
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"repne\n\t"
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"scasb\n\t"
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|
"je 1f\n\t"
|
||
|
|
"movl $1,%0\n"
|
||
|
|
"1:\tdecl %0"
|
||
|
|
:"=D" (__res), "=&c" (d0) : "a" (c),"0" (cs),"1" (count));
|
||
|
|
return __res;
|
||
|
|
}
|
||
|
|
|
||
|
|
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))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* memset(x,0,y) is a reasonably common thing to do, so we want to fill
|
||
|
|
* things 32 bits at a time even when we don't know the size of the
|
||
|
|
* area at compile-time..
|
||
|
|
*/
|
||
|
|
static inline void * __constant_c_memset(void * s, unsigned long c, size_t count)
|
||
|
|
{
|
||
|
|
int d0, d1;
|
||
|
|
__asm__ __volatile__(
|
||
|
|
"rep ; stosl\n\t"
|
||
|
|
"testb $2,%b3\n\t"
|
||
|
|
"je 1f\n\t"
|
||
|
|
"stosw\n"
|
||
|
|
"1:\ttestb $1,%b3\n\t"
|
||
|
|
"je 2f\n\t"
|
||
|
|
"stosb\n"
|
||
|
|
"2:"
|
||
|
|
: "=&c" (d0), "=&D" (d1)
|
||
|
|
:"a" (c), "q" (count), "0" (count/4), "1" ((long) s)
|
||
|
|
:"memory");
|
||
|
|
return (s);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Added by Gertjan van Wingerde to make minix and sysv module work */
|
||
|
|
#define __HAVE_ARCH_STRNLEN
|
||
|
|
STATIC INLINE size_t strnlen(const char * s, size_t count)
|
||
|
|
{
|
||
|
|
int d0;
|
||
|
|
register int __res;
|
||
|
|
__asm__ __volatile__(
|
||
|
|
"movl %2,%0\n\t"
|
||
|
|
"jmp 2f\n"
|
||
|
|
"1:\tcmpb $0,(%0)\n\t"
|
||
|
|
"je 3f\n\t"
|
||
|
|
"incl %0\n"
|
||
|
|
"2:\tdecl %1\n\t"
|
||
|
|
"cmpl $-1,%1\n\t"
|
||
|
|
"jne 1b\n"
|
||
|
|
"3:\tsubl %2,%0"
|
||
|
|
:"=a" (__res), "=&d" (d0)
|
||
|
|
:"c" (s),"1" (count));
|
||
|
|
return __res;
|
||
|
|
}
|
||
|
|
/* end of additional stuff */
|
||
|
|
|
||
|
|
#define __HAVE_ARCH_STRSTR
|
||
|
|
|
||
|
|
extern char *strstr(const char *cs, const char *ct);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This looks horribly ugly, but the compiler can optimize it totally,
|
||
|
|
* as we by now know that both pattern and count is constant..
|
||
|
|
*/
|
||
|
|
static inline void * __constant_c_and_count_memset(void * s, unsigned long pattern, size_t count)
|
||
|
|
{
|
||
|
|
switch (count) {
|
||
|
|
case 0:
|
||
|
|
return s;
|
||
|
|
case 1:
|
||
|
|
*(unsigned char *)s = pattern;
|
||
|
|
return s;
|
||
|
|
case 2:
|
||
|
|
*(unsigned short *)s = pattern;
|
||
|
|
return s;
|
||
|
|
case 3:
|
||
|
|
*(unsigned short *)s = pattern;
|
||
|
|
*(2+(unsigned char *)s) = pattern;
|
||
|
|
return s;
|
||
|
|
case 4:
|
||
|
|
*(unsigned long *)s = pattern;
|
||
|
|
return s;
|
||
|
|
}
|
||
|
|
#define COMMON(x) \
|
||
|
|
__asm__ __volatile__( \
|
||
|
|
"rep ; stosl" \
|
||
|
|
x \
|
||
|
|
: "=&c" (d0), "=&D" (d1) \
|
||
|
|
: "a" (pattern),"0" (count/4),"1" ((long) s) \
|
||
|
|
: "memory")
|
||
|
|
{
|
||
|
|
int d0, d1;
|
||
|
|
switch (count % 4) {
|
||
|
|
case 0: COMMON(""); return s;
|
||
|
|
case 1: COMMON("\n\tstosb"); return s;
|
||
|
|
case 2: COMMON("\n\tstosw"); return s;
|
||
|
|
default: COMMON("\n\tstosw\n\tstosb"); return s;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#undef COMMON
|
||
|
|
}
|
||
|
|
|
||
|
|
#define __constant_c_x_memset(s, c, count) \
|
||
|
|
(__builtin_constant_p(count) ? \
|
||
|
|
__constant_c_and_count_memset((s),(c),(count)) : \
|
||
|
|
__constant_c_memset((s),(c),(count)))
|
||
|
|
|
||
|
|
#define __memset(s, c, count) \
|
||
|
|
(__builtin_constant_p(count) ? \
|
||
|
|
__constant_count_memset((s),(c),(count)) : \
|
||
|
|
__memset_generic((s),(c),(count)))
|
||
|
|
|
||
|
|
#define __HAVE_ARCH_MEMSET
|
||
|
|
#define memset(s, c, count) \
|
||
|
|
(__builtin_constant_p(c) ? \
|
||
|
|
__constant_c_x_memset((s),(0x01010101UL*(unsigned char)(c)),(count)) : \
|
||
|
|
__memset((s),(c),(count)))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* find the first occurrence of byte 'c', or 1 past the area if none
|
||
|
|
*/
|
||
|
|
#define __HAVE_ARCH_MEMSCAN
|
||
|
|
STATIC INLINE void * memscan(void * addr, int c, size_t size)
|
||
|
|
{
|
||
|
|
if (!size)
|
||
|
|
return addr;
|
||
|
|
__asm__("repnz; scasb\n\t"
|
||
|
|
"jnz 1f\n\t"
|
||
|
|
"dec %%edi\n"
|
||
|
|
"1:"
|
||
|
|
: "=D" (addr), "=c" (size)
|
||
|
|
: "0" (addr), "1" (size), "a" (c));
|
||
|
|
return addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|