linux/include/asm-x86_64/string.h
Andi Kleen 6edfba1b33 [PATCH] x86_64: Don't define string functions to builtin
gcc should handle this anyways, and it causes problems when
sprintf is turned into strcpy by gcc behind our backs and
the C fallback version of strcpy is actually defining __builtin_strcpy

Then drop -ffreestanding from the main Makefile because it isn't
needed anymore and implies -fno-builtin, which is wrong now.
(it was only added for x86-64, so dropping it should be safe)

Noticed by Roman Zippel

Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-25 09:10:53 -08:00

56 lines
1.4 KiB
C

#ifndef _X86_64_STRING_H_
#define _X86_64_STRING_H_
#ifdef __KERNEL__
/* Written 2002 by Andi Kleen */
/* Only used for special circumstances. Stolen from i386/string.h */
static inline void * __inline_memcpy(void * to, const void * from, size_t n)
{
unsigned long d0, d1, d2;
__asm__ __volatile__(
"rep ; movsl\n\t"
"testb $2,%b4\n\t"
"je 1f\n\t"
"movsw\n"
"1:\ttestb $1,%b4\n\t"
"je 2f\n\t"
"movsb\n"
"2:"
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
:"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from)
: "memory");
return (to);
}
/* Even with __builtin_ the compiler may decide to use the out of line
function. */
#define __HAVE_ARCH_MEMCPY 1
extern void *__memcpy(void *to, const void *from, size_t len);
#define memcpy(dst,src,len) \
({ size_t __len = (len); \
void *__ret; \
if (__builtin_constant_p(len) && __len >= 64) \
__ret = __memcpy((dst),(src),__len); \
else \
__ret = __builtin_memcpy((dst),(src),__len); \
__ret; })
#define __HAVE_ARCH_MEMSET
void *memset(void *s, int c, size_t n);
#define __HAVE_ARCH_MEMMOVE
void * memmove(void * dest,const void *src,size_t count);
int memcmp(const void * cs,const void * ct,size_t count);
size_t strlen(const char * s);
char *strcpy(char * dest,const char *src);
char *strcat(char * dest, const char * src);
int strcmp(const char * cs,const char * ct);
#endif /* __KERNEL__ */
#endif