WebSVN – HelenOS – Diff – /tags/0.4.1/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
	move	$t2,$a0			# save dst
 
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	$v0,$t2
 
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	$v0,$t2
 
jump_to_kernel:
	#
	# TODO
	# Make sure that the I-cache, D-cache and memory are mutually coherent
	# before passing control to the copied code.
	#
	j $a0
	nop
 

Rev 3274	Rev 4687
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	move $t2,$a0 # save dst	51	move $t2,$a0 # save dst
52		52
53	0:	53	0:
54	beq $a2,$zero,2f	54	beq $a2,$zero,2f
55	move $a3,$zero	55	move $a3,$zero
56		56
57	1:	57	1:
58	addu $v0,$a1,$a3	58	addu $v0,$a1,$a3
59	lbu $a0,0($v0)	59	lbu $a0,0($v0)
60	addu $v1,$t0,$a3	60	addu $v1,$t0,$a3
61	addiu $a3,$a3,1	61	addiu $a3,$a3,1
62	bne $a3,$a2,1b	62	bne $a3,$a2,1b
63	sb $a0,0($v1)	63	sb $a0,0($v1)
64		64
65	2:	65	2:
66	jr $ra	66	jr $ra
67	move $v0,$t2	67	move $v0,$t2
68		68
69	3:	69	3:
70	addiu $v0,$a0,3	70	addiu $v0,$a0,3
71	and $v0,$v0,$v1	71	and $v0,$v0,$v1
72	bne $a0,$v0,0b	72	bne $a0,$v0,0b
73	srl $t1,$a2,2	73	srl $t1,$a2,2
74		74
75	beq $t1,$zero,5f	75	beq $t1,$zero,5f
76	move $a3,$zero	76	move $a3,$zero
77		77
78	move $a3,$zero	78	move $a3,$zero
79	move $a0,$zero	79	move $a0,$zero
80	4:	80	4:
81	addu $v0,$a1,$a0	81	addu $v0,$a1,$a0
82	lw $v1,0($v0)	82	lw $v1,0($v0)
83	addiu $a3,$a3,1	83	addiu $a3,$a3,1
84	addu $v0,$t0,$a0	84	addu $v0,$t0,$a0
85	sw $v1,0($v0)	85	sw $v1,0($v0)
86	bne $a3,$t1,4b	86	bne $a3,$t1,4b
87	addiu $a0,$a0,4	87	addiu $a0,$a0,4
88		88
89	5:	89	5:
90	andi $a2,$a2,0x3	90	andi $a2,$a2,0x3
91	beq $a2,$zero,2b	91	beq $a2,$zero,2b
92	nop	92	nop
93		93
94	sll $v0,$a3,2	94	sll $v0,$a3,2
95	addu $t1,$v0,$t0	95	addu $t1,$v0,$t0
96	move $a3,$zero	96	move $a3,$zero
97	addu $t0,$v0,$a1	97	addu $t0,$v0,$a1
98	6:	98	6:
99	addu $v0,$t0,$a3	99	addu $v0,$t0,$a3
100	lbu $a0,0($v0)	100	lbu $a0,0($v0)
101	addu $v1,$t1,$a3	101	addu $v1,$t1,$a3
102	addiu $a3,$a3,1	102	addiu $a3,$a3,1
103	bne $a3,$a2,6b	103	bne $a3,$a2,6b
104	sb $a0,0($v1)	104	sb $a0,0($v1)
105		105
106	jr $ra	106	jr $ra
107	move $v0,$t2	107	move $v0,$t2
108		108
109	jump_to_kernel:	109	jump_to_kernel:
110	#	110	#
111	# TODO	111	# TODO
112	# Make sure that the I-cache, D-cache and memory are mutually coherent	112	# Make sure that the I-cache, D-cache and memory are mutually coherent
113	# before passing control to the copied code.	113	# before passing control to the copied code.
114	#	114	#
115	j $a0	115	j $a0
116	nop	116	nop
117		117

Subversion Repositories HelenOS

(root)/tags/0.4.1/boot/arch/mips32/loader/asm.S – Rev 3274 → 4687