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1018 | decky | 1 | # |
2 | # Copyright (C) 2006 Martin Decky |
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3 | # All rights reserved. |
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4 | # |
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5 | # Redistribution and use in source and binary forms, with or without |
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6 | # modification, are permitted provided that the following conditions |
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7 | # are met: |
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8 | # |
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9 | # - Redistributions of source code must retain the above copyright |
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10 | # notice, this list of conditions and the following disclaimer. |
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11 | # - Redistributions in binary form must reproduce the above copyright |
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12 | # notice, this list of conditions and the following disclaimer in the |
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13 | # documentation and/or other materials provided with the distribution. |
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14 | # - The name of the author may not be used to endorse or promote products |
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15 | # derived from this software without specific prior written permission. |
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16 | # |
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17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | # |
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28 | |||
29 | #include "regname.h" |
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30 | |||
31 | .set noat |
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32 | .set noreorder |
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33 | .set nomacro |
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34 | |||
35 | .text |
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36 | |||
37 | .global halt |
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1685 | decky | 38 | .global memcpy |
1018 | decky | 39 | .global jump_to_kernel |
40 | |||
41 | halt: |
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42 | b halt |
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43 | nop |
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1685 | decky | 44 | |
45 | memcpy: |
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46 | addiu $v0,$a1,3 |
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47 | li $v1,-4 # 0xfffffffffffffffc |
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48 | and $v0,$v0,$v1 |
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49 | beq $a1,$v0,3f |
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50 | move $t0,$a0 |
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1018 | decky | 51 | |
1685 | decky | 52 | 0: |
53 | beq $a2,$zero,2f |
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54 | move $a3,$zero |
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55 | |||
56 | 1: |
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57 | addu $v0,$a1,$a3 |
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58 | lbu $a0,0($v0) |
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59 | addu $v1,$t0,$a3 |
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60 | addiu $a3,$a3,1 |
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61 | bne $a3,$a2,1b |
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62 | sb $a0,0($v1) |
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63 | |||
64 | 2: |
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65 | jr $ra |
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66 | move $v0,$a1 |
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67 | |||
68 | 3: |
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69 | addiu $v0,$a0,3 |
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70 | and $v0,$v0,$v1 |
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71 | bne $a0,$v0,0b |
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72 | srl $t1,$a2,2 |
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73 | |||
74 | beq $t1,$zero,5f |
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75 | move $a3,$zero |
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76 | |||
77 | move $a3,$zero |
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78 | move $a0,$zero |
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79 | 4: |
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80 | addu $v0,$a1,$a0 |
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81 | lw $v1,0($v0) |
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82 | addiu $a3,$a3,1 |
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83 | addu $v0,$t0,$a0 |
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84 | sw $v1,0($v0) |
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85 | bne $a3,$t1,4b |
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86 | addiu $a0,$a0,4 |
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87 | |||
88 | 5: |
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89 | andi $a2,$a2,0x3 |
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90 | beq $a2,$zero,2b |
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91 | nop |
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92 | |||
93 | sll $v0,$a3,2 |
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94 | addu $t1,$v0,$t0 |
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95 | move $a3,$zero |
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96 | addu $t0,$v0,$a1 |
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97 | 6: |
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98 | addu $v0,$t0,$a3 |
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99 | lbu $a0,0($v0) |
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100 | addu $v1,$t1,$a3 |
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101 | addiu $a3,$a3,1 |
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102 | bne $a3,$a2,6b |
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103 | sb $a0,0($v1) |
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104 | |||
105 | jr $ra |
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106 | move $v0,$a1 |
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107 | |||
1018 | decky | 108 | jump_to_kernel: |
109 | # .word 0x39 |
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110 | j $a0 |
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111 | nop |