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/*-
* Copyright (c) 2018 Instituto de Pesquisas Eldorado
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of its contributors may
* be used to endorse or promote products derived from this software
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#ifndef FN_NAME
#define FN_NAME __memcpy
WEAK_REFERENCE(__memcpy, memcpy);
#define BLOCK_BITS 4
#endif
#define BLOCK_BYTES (1 << BLOCK_BITS)
#define BLOCK_MASK (BLOCK_BYTES - 1)
/* Minimum 8 byte alignment, to avoid cache-inhibited alignment faults. */
#ifndef ALIGN_MASK
#define ALIGN_MASK 0x7
#endif
/*
* r3: dst
* r4: src
* r5: len
*/
ENTRY(FN_NAME)
cmpdi %r5, 0 /* len == 0? nothing to do */
beqlr-
/* If src and dst are relatively misaligned, do byte copies. */
andi. %r8, %r3, ALIGN_MASK
andi. %r7, %r4, ALIGN_MASK
cmpd %r8, %r7
mr %r7, %r5
mr %r8, %r3 /* save dst */
bne .Lcopy_remaining_fix_index_byte
/* align src */
.Lalignment_loop:
lbz %r6, 0(%r4)
stb %r6, 0(%r3)
addi %r3, %r3, 1
addi %r4, %r4, 1
addi %r5, %r5, -1
cmpdi %r5, 0
beq .Lexit
andi. %r0, %r4, BLOCK_MASK
bne .Lalignment_loop
/* r7 = remaining, non-block, bytes */
andi. %r7, %r5, BLOCK_MASK
/* Check if there are blocks of BLOCK_BYTES to be copied */
xor. %r5, %r5, %r7
beq .Lcopy_remaining_fix_index_byte
#ifdef FN_COPY_LOOP
FN_COPY_LOOP
#else
/* Setup to copy word with ldu and stdu */
ld %r6, 0(%r4)
ld %r9, 8(%r4)
std %r6, 0(%r3)
std %r9, 8(%r3)
addi %r5, %r5, -BLOCK_BYTES
cmpd %r5, 0
beq .Lcopy_remaining_fix_index_word
srdi %r5, %r5, BLOCK_BITS
mtctr %r5
.Lcopy_word:
ldu %r6, 16(%r4)
ld %r9, 8(%r4)
stdu %r6, 16(%r3)
std %r9, 8(%r3)
bdnz .Lcopy_word
.Lcopy_remaining_fix_index_word:
/* Check if there are remaining bytes */
cmpd %r7, 0
beq .Lexit
addi %r3, %r3, BLOCK_MASK
addi %r4, %r4, BLOCK_MASK
b .Lcopy_remaining
#endif
.Lcopy_remaining_fix_index_byte:
addi %r4, %r4, -1
addi %r3, %r3, -1
/* Copy remaining bytes */
.Lcopy_remaining:
mtctr %r7
.Lcopy_remaining_loop:
lbzu %r6, 1(%r4)
stbu %r6, 1(%r3)
bdnz .Lcopy_remaining_loop
.Lexit:
/* Restore dst */
mr %r3, %r8
blr
END(FN_NAME)
.section .note.GNU-stack,"",%progbits
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