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#
# Copyright (C) 2006 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# - 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.
# - The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "regname.h"
.set noat
.set noreorder
.set nomacro
.text
.global halt
.global memcpy
.global jump_to_kernel
halt:
b halt
nop
memcpy:
addiu $v0,$a1,3
li $v1,-4 # 0xfffffffffffffffc
and $v0,$v0,$v1
beq $a1,$v0,3f
move $t0,$a0
0:
beq $a2,$zero,2f
move $a3,$zero
1:
addu $v0,$a1,$a3
lbu $a0,0($v0)
addu $v1,$t0,$a3
addiu $a3,$a3,1
bne $a3,$a2,1b
sb $a0,0($v1)
2:
jr $ra
move $v0,$a1
3:
addiu $v0,$a0,3
and $v0,$v0,$v1
bne $a0,$v0,0b
srl $t1,$a2,2
beq $t1,$zero,5f
move $a3,$zero
move $a3,$zero
move $a0,$zero
4:
addu $v0,$a1,$a0
lw $v1,0($v0)
addiu $a3,$a3,1
addu $v0,$t0,$a0
sw $v1,0($v0)
bne $a3,$t1,4b
addiu $a0,$a0,4
5:
andi $a2,$a2,0x3
beq $a2,$zero,2b
nop
sll $v0,$a3,2
addu $t1,$v0,$t0
move $a3,$zero
addu $t0,$v0,$a1
6:
addu $v0,$t0,$a3
lbu $a0,0($v0)
addu $v1,$t1,$a3
addiu $a3,$a3,1
bne $a3,$a2,6b
sb $a0,0($v1)
jr $ra
move $v0,$a1
jump_to_kernel:
# .word 0x39
j $a0
nop
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