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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 | ||
113 | 113 | ||
114 |
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114 |
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115 | 115 | ||
116 | 116 | ||
117 | 117 |