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afc366f01b
Including <linux/compiler.h> is enough for general use. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
132 lines
3.3 KiB
C
132 lines
3.3 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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* SPDX-License-Identifier: GPL-2.0+
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*/
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/* From glibc-2.14, sysdeps/i386/memset.c */
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <asm/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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#define OP_T_THRES 8
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#define OPSIZ (sizeof(op_t))
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#define BYTE_COPY_FWD(dst_bp, src_bp, nbytes) \
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do { \
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int __d0; \
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asm volatile( \
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/* Clear the direction flag, so copying goes forward. */ \
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"cld\n" \
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/* Copy bytes. */ \
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"rep\n" \
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"movsb" : \
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"=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \
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"0" (dst_bp), "1" (src_bp), "2" (nbytes) : \
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"memory"); \
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} while (0)
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#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
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do { \
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int __d0; \
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asm volatile( \
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/* Clear the direction flag, so copying goes forward. */ \
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"cld\n" \
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/* Copy longwords. */ \
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"rep\n" \
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"movsl" : \
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"=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \
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"0" (dst_bp), "1" (src_bp), "2" ((nbytes) / 4) : \
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"memory"); \
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(nbytes_left) = (nbytes) % 4; \
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} while (0)
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void *memcpy(void *dstpp, const void *srcpp, size_t len)
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{
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unsigned long int dstp = (long int)dstpp;
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unsigned long int srcp = (long int)srcpp;
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/* Copy from the beginning to the end. */
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/* If there not too few bytes to copy, use word copy. */
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if (len >= OP_T_THRES) {
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/* Copy just a few bytes to make DSTP aligned. */
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len -= (-dstp) % OPSIZ;
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BYTE_COPY_FWD(dstp, srcp, (-dstp) % OPSIZ);
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/* Copy from SRCP to DSTP taking advantage of the known
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* alignment of DSTP. Number of bytes remaining is put
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* in the third argument, i.e. in LEN. This number may
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* vary from machine to machine.
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*/
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WORD_COPY_FWD(dstp, srcp, len, len);
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/* Fall out and copy the tail. */
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}
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/* There are just a few bytes to copy. Use byte memory operations. */
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BYTE_COPY_FWD(dstp, srcp, len);
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return dstpp;
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}
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