a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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* Copyright (C) 1991,1992,1993,1997,1998,2003, 2005 Free Software Foundation, Inc.
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* This file is part of the GNU C Library.
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* Copyright (c) 2011 The Chromium OS Authors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* From glibc-2.14, sysdeps/i386/memset.c */
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#include <stdint.h>
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#include "string.h"
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typedef uint32_t op_t;
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void *memset(void *dstpp, int c, size_t len)
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{
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int d0;
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unsigned long int dstp = (unsigned long int) dstpp;
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/* This explicit register allocation improves code very much indeed. */
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register op_t x asm("ax");
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x = (unsigned char) c;
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/* Clear the direction flag, so filling will move forward. */
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asm volatile("cld");
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/* This threshold value is optimal. */
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if (len >= 12) {
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/* Fill X with four copies of the char we want to fill with. */
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x |= (x << 8);
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x |= (x << 16);
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/* Adjust LEN for the bytes handled in the first loop. */
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len -= (-dstp) % sizeof(op_t);
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/*
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* There are at least some bytes to set. No need to test for
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* LEN == 0 in this alignment loop.
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*/
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/* Fill bytes until DSTP is aligned on a longword boundary. */
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asm volatile(
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"rep\n"
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"stosb" /* %0, %2, %3 */ :
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"=D" (dstp), "=c" (d0) :
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"0" (dstp), "1" ((-dstp) % sizeof(op_t)), "a" (x) :
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"memory");
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/* Fill longwords. */
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asm volatile(
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"rep\n"
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"stosl" /* %0, %2, %3 */ :
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"=D" (dstp), "=c" (d0) :
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"0" (dstp), "1" (len / sizeof(op_t)), "a" (x) :
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"memory");
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len %= sizeof(op_t);
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}
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/* Write the last few bytes. */
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asm volatile(
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"rep\n"
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"stosb" /* %0, %2, %3 */ :
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"=D" (dstp), "=c" (d0) :
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"0" (dstp), "1" (len), "a" (x) :
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"memory");
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return dstpp;
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}
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void *memcpy(void *dest, const void *src, size_t n)
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{
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unsigned long d0, d1, d2;
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asm volatile(
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"rep ; movsl\n\t"
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"movl %4,%%ecx\n\t"
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"rep ; movsb\n\t"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
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: "memory"
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);
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return dest;
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}
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