| 1 | #
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| 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 |
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| 29 | #include "regname.h"
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| 30 |
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| 31 | .set noat
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| 32 | .set noreorder
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| 33 | .set nomacro
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| 34 |
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| 35 | .text
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| 36 |
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| 37 | .global halt
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| 38 | .global memcpy
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| 39 | .global jump_to_kernel
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| 40 |
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| 41 | halt:
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| 42 | b halt
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| 43 | nop
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| 44 |
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| 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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| 51 | move $t2,$a0 # save dst
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| 52 |
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| 53 | 0:
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| 54 | beq $a2,$zero,2f
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| 55 | move $a3,$zero
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| 56 |
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| 57 | 1:
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| 58 | addu $v0,$a1,$a3
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| 59 | lbu $a0,0($v0)
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| 60 | addu $v1,$t0,$a3
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| 61 | addiu $a3,$a3,1
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| 62 | bne $a3,$a2,1b
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| 63 | sb $a0,0($v1)
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| 64 |
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| 65 | 2:
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| 66 | jr $ra
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| 67 | move $v0,$t2
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| 68 |
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| 69 | 3:
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| 70 | addiu $v0,$a0,3
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| 71 | and $v0,$v0,$v1
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| 72 | bne $a0,$v0,0b
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| 73 | srl $t1,$a2,2
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| 74 |
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| 75 | beq $t1,$zero,5f
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| 76 | move $a3,$zero
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| 77 |
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| 78 | move $a3,$zero
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| 79 | move $a0,$zero
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| 80 | 4:
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| 81 | addu $v0,$a1,$a0
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| 82 | lw $v1,0($v0)
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| 83 | addiu $a3,$a3,1
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| 84 | addu $v0,$t0,$a0
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| 85 | sw $v1,0($v0)
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| 86 | bne $a3,$t1,4b
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| 87 | addiu $a0,$a0,4
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| 88 |
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| 89 | 5:
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| 90 | andi $a2,$a2,0x3
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| 91 | beq $a2,$zero,2b
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| 92 | nop
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| 93 |
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| 94 | sll $v0,$a3,2
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| 95 | addu $t1,$v0,$t0
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| 96 | move $a3,$zero
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| 97 | addu $t0,$v0,$a1
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| 98 | 6:
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| 99 | addu $v0,$t0,$a3
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| 100 | lbu $a0,0($v0)
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| 101 | addu $v1,$t1,$a3
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| 102 | addiu $a3,$a3,1
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| 103 | bne $a3,$a2,6b
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| 104 | sb $a0,0($v1)
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| 105 |
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| 106 | jr $ra
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| 107 | move $v0,$t2
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| 108 |
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| 109 | jump_to_kernel:
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| 110 | #
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| 111 | # TODO
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| 112 | # Make sure that the I-cache, D-cache and memory are mutually coherent
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| 113 | # before passing control to the copied code.
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| 114 | #
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| 115 | j $a0
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| 116 | nop
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