WebSVN – HelenOS – Diff – /trunk/boot/arch/mips32/loader/asm.S


#
# 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
 

Rev 1787	Rev 2071
1	#	1	#
2	# Copyright (C) 2006 Martin Decky	2	# Copyright (c) 2006 Martin Decky
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	#include "regname.h"	29	#include "regname.h"
30		30
31	.set noat	31	.set noat
32	.set noreorder	32	.set noreorder
33	.set nomacro	33	.set nomacro
34		34
35	.text	35	.text
36		36
37	.global halt	37	.global halt
38	.global memcpy	38	.global memcpy
39	.global jump_to_kernel	39	.global jump_to_kernel
40		40
41	halt:	41	halt:
42	b halt	42	b halt
43	nop	43	nop
44		44
45	memcpy:	45	memcpy:
46	addiu $v0,$a1,3	46	addiu $v0,$a1,3
47	li $v1,-4 # 0xfffffffffffffffc	47	li $v1,-4 # 0xfffffffffffffffc
48	and $v0,$v0,$v1	48	and $v0,$v0,$v1
49	beq $a1,$v0,3f	49	beq $a1,$v0,3f
50	move $t0,$a0	50	move $t0,$a0
51		51
52	0:	52	0:
53	beq $a2,$zero,2f	53	beq $a2,$zero,2f
54	move $a3,$zero	54	move $a3,$zero
55		55
56	1:	56	1:
57	addu $v0,$a1,$a3	57	addu $v0,$a1,$a3
58	lbu $a0,0($v0)	58	lbu $a0,0($v0)
59	addu $v1,$t0,$a3	59	addu $v1,$t0,$a3
60	addiu $a3,$a3,1	60	addiu $a3,$a3,1
61	bne $a3,$a2,1b	61	bne $a3,$a2,1b
62	sb $a0,0($v1)	62	sb $a0,0($v1)
63		63
64	2:	64	2:
65	jr $ra	65	jr $ra
66	move $v0,$a1	66	move $v0,$a1
67		67
68	3:	68	3:
69	addiu $v0,$a0,3	69	addiu $v0,$a0,3
70	and $v0,$v0,$v1	70	and $v0,$v0,$v1
71	bne $a0,$v0,0b	71	bne $a0,$v0,0b
72	srl $t1,$a2,2	72	srl $t1,$a2,2
73		73
74	beq $t1,$zero,5f	74	beq $t1,$zero,5f
75	move $a3,$zero	75	move $a3,$zero
76		76
77	move $a3,$zero	77	move $a3,$zero
78	move $a0,$zero	78	move $a0,$zero
79	4:	79	4:
80	addu $v0,$a1,$a0	80	addu $v0,$a1,$a0
81	lw $v1,0($v0)	81	lw $v1,0($v0)
82	addiu $a3,$a3,1	82	addiu $a3,$a3,1
83	addu $v0,$t0,$a0	83	addu $v0,$t0,$a0
84	sw $v1,0($v0)	84	sw $v1,0($v0)
85	bne $a3,$t1,4b	85	bne $a3,$t1,4b
86	addiu $a0,$a0,4	86	addiu $a0,$a0,4
87		87
88	5:	88	5:
89	andi $a2,$a2,0x3	89	andi $a2,$a2,0x3
90	beq $a2,$zero,2b	90	beq $a2,$zero,2b
91	nop	91	nop
92		92
93	sll $v0,$a3,2	93	sll $v0,$a3,2
94	addu $t1,$v0,$t0	94	addu $t1,$v0,$t0
95	move $a3,$zero	95	move $a3,$zero
96	addu $t0,$v0,$a1	96	addu $t0,$v0,$a1
97	6:	97	6:
98	addu $v0,$t0,$a3	98	addu $v0,$t0,$a3
99	lbu $a0,0($v0)	99	lbu $a0,0($v0)
100	addu $v1,$t1,$a3	100	addu $v1,$t1,$a3
101	addiu $a3,$a3,1	101	addiu $a3,$a3,1
102	bne $a3,$a2,6b	102	bne $a3,$a2,6b
103	sb $a0,0($v1)	103	sb $a0,0($v1)
104		104
105	jr $ra	105	jr $ra
106	move $v0,$a1	106	move $v0,$a1
107		107
108	jump_to_kernel:	108	jump_to_kernel:
109	# .word 0x39	109	# .word 0x39
110	j $a0	110	j $a0
111	nop	111	nop
112		112

Subversion Repositories HelenOS

(root)/trunk/boot/arch/mips32/loader/asm.S – Rev 1787 → 2071