c324794cb0
The implementations for various stdlib functions in libc/memory.c are very generic and should work under just about any circumstances. They are unfortunately also very slow. This change makes them weak symbols so that faster versions can be defined on a per architecture basis which will automatically take the place of the slow versions. Change-Id: Ia1ac90d9dcd45962b2a15f61ecc74b0a4676048d Signed-off-by: Gabe Black <gabeblack@google.com> Reviewed-on: http://review.coreboot.org/1725 Reviewed-by: Patrick Georgi <patrick@georgi-clan.de> Tested-by: build bot (Jenkins)
110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* It has originally been taken from the HelenOS project
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* (http://www.helenos.eu), and slightly modified for our purposes.
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*
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* Copyright (c) 2005 Martin Decky
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <libpayload.h>
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void *memset(void *s, int c, size_t n)
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__attribute__((weak, alias("default_memset")));
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void *default_memset(void *s, int c, size_t n)
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{
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char *os = s;
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while (n--)
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*(os++) = c;
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return s;
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}
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void *memcpy(void *dst, const void *src, size_t n)
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__attribute__((weak, alias("default_memcpy")));
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void *default_memcpy(void *dst, const void *src, size_t n)
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{
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int i;
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void *ret = dst;
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for(i = 0; i < n % sizeof(unsigned long); i++)
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((unsigned char *) dst)[i] = ((unsigned char *) src)[i];
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n -= i;
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src += i;
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dst += i;
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for(i = 0; i < n / sizeof(unsigned long); i++)
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((unsigned long *) dst)[i] = ((unsigned long *) src)[i];
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return ret;
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}
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void *memmove(void *dst, const void *src, size_t n)
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__attribute__((weak, alias("default_memmove")));
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void *default_memmove(void *dst, const void *src, size_t n)
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{
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int i;
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unsigned long offs;
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if (src > dst)
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return memcpy(dst, src, n);
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offs = n - (n % sizeof(unsigned long));
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for (i = (n % sizeof(unsigned long)) - 1; i >= 0; i--)
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((unsigned char *)dst)[i + offs] =
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((unsigned char *)src)[i + offs];
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for (i = n / sizeof(unsigned long) - 1; i >= 0; i--)
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((unsigned long *)dst)[i] = ((unsigned long *)src)[i];
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return dst;
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}
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/**
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* Compare two memory areas.
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*
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* @param s1 Pointer to the first area to compare.
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* @param s2 Pointer to the second area to compare.
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* @param len Size of the first area in bytes (both must have the same length).
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* @return If len is 0, return zero. If the areas match, return zero.
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* Otherwise return non-zero.
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*/
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int memcmp(const void *s1, const void *s2, size_t len)
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__attribute__((weak, alias("default_memcmp")));
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int default_memcmp(const void *s1, const void *s2, size_t len)
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{
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for (; len && *(char *)s1++ == *(char *)s2++; len--) ;
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return len;
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}
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