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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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4d14a45985
This mirrors commit ff60fab71b
(x86: Use __builtin_memset and __builtin_memcpy for memset/memcpy)
Signed-off-by: David S. Miller <davem@davemloft.net>
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*
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* string.h: External definitions for optimized assembly string
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* routines for the Linux Kernel.
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*
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* Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#ifndef __SPARC_STRING_H__
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#define __SPARC_STRING_H__
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#include <asm/page.h>
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/* Really, userland/ksyms should not see any of this stuff. */
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#ifdef __KERNEL__
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extern void __memmove(void *,const void *,__kernel_size_t);
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#ifndef EXPORT_SYMTAB_STROPS
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/* First the mem*() things. */
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#define __HAVE_ARCH_MEMMOVE
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#undef memmove
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#define memmove(_to, _from, _n) \
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({ \
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void *_t = (_to); \
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__memmove(_t, (_from), (_n)); \
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_t; \
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})
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#define __HAVE_ARCH_MEMCPY
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#define memcpy(t, f, n) __builtin_memcpy(t, f, n)
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#define __HAVE_ARCH_MEMSET
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#define memset(s, c, count) __builtin_memset(s, c, count)
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#define __HAVE_ARCH_MEMSCAN
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#undef memscan
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#define memscan(__arg0, __char, __arg2) \
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({ \
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extern void *__memscan_zero(void *, size_t); \
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extern void *__memscan_generic(void *, int, size_t); \
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void *__retval, *__addr = (__arg0); \
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size_t __size = (__arg2); \
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\
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if(__builtin_constant_p(__char) && !(__char)) \
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__retval = __memscan_zero(__addr, __size); \
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else \
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__retval = __memscan_generic(__addr, (__char), __size); \
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\
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__retval; \
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})
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#define __HAVE_ARCH_MEMCMP
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extern int memcmp(const void *,const void *,__kernel_size_t);
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/* Now the str*() stuff... */
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#define __HAVE_ARCH_STRLEN
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extern __kernel_size_t strlen(const char *);
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#define __HAVE_ARCH_STRNCMP
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extern int __strncmp(const char *, const char *, __kernel_size_t);
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static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
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{
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register int retval;
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switch(count) {
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case 0: return 0;
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case 1: return (src[0] - dest[0]);
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case 2: retval = (src[0] - dest[0]);
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if(!retval && src[0])
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retval = (src[1] - dest[1]);
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return retval;
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case 3: retval = (src[0] - dest[0]);
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if(!retval && src[0]) {
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retval = (src[1] - dest[1]);
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if(!retval && src[1])
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retval = (src[2] - dest[2]);
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}
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return retval;
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case 4: retval = (src[0] - dest[0]);
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if(!retval && src[0]) {
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retval = (src[1] - dest[1]);
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if(!retval && src[1]) {
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retval = (src[2] - dest[2]);
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if (!retval && src[2])
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retval = (src[3] - dest[3]);
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}
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}
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return retval;
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case 5: retval = (src[0] - dest[0]);
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if(!retval && src[0]) {
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retval = (src[1] - dest[1]);
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if(!retval && src[1]) {
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retval = (src[2] - dest[2]);
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if (!retval && src[2]) {
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retval = (src[3] - dest[3]);
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if (!retval && src[3])
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retval = (src[4] - dest[4]);
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}
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}
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}
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return retval;
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default:
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retval = (src[0] - dest[0]);
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if(!retval && src[0]) {
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retval = (src[1] - dest[1]);
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if(!retval && src[1]) {
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retval = (src[2] - dest[2]);
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if(!retval && src[2])
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retval = __strncmp(src+3,dest+3,count-3);
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}
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}
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return retval;
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}
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}
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#undef strncmp
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#define strncmp(__arg0, __arg1, __arg2) \
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(__builtin_constant_p(__arg2) ? \
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__constant_strncmp(__arg0, __arg1, __arg2) : \
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__strncmp(__arg0, __arg1, __arg2))
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#endif /* !EXPORT_SYMTAB_STROPS */
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#endif /* __KERNEL__ */
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#endif /* !(__SPARC_STRING_H__) */
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