| 1 | /*
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| 2 | * Copyright (c) 2013 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 | .text
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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 | .global memset
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| 36 | .global memcpy
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| 37 |
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| 38 | memset:
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| 39 | move $v0, $a0
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| 40 | beqz $a2, 0f
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| 41 | addiu $t1, $a2, -1
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| 42 |
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| 43 | negu $t0, $a0
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| 44 | andi $t0, $t0, 0x3
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| 45 | sltu $v1, $a2, $t0
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| 46 | bnez $v1, 1f
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| 47 | andi $a1, $a1, 0xff
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| 48 |
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| 49 | 7:
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| 50 | sltiu $v1, $a2, 4
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| 51 | beqz $v1, 2f
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| 52 | move $v1, $v0
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| 53 |
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| 54 | move $t0, $a2
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| 55 |
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| 56 | 3:
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| 57 | sb $a1, 0($v1)
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| 58 | addiu $v1, $v1, 1
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| 59 | subu $a3, $v1, $v0
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| 60 | sltu $a3, $a3, $t0
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| 61 | bnez $a3, 3b
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| 62 | addiu $t1, $t1, -1
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| 63 |
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| 64 | beq $a2, $t0, 0f
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| 65 | subu $a2, $a2, $t0
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| 66 |
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| 67 | 8:
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| 68 | srl $a0, $a2, 0x2
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| 69 | sll $t4, $a0, 0x2
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| 70 | beqz $t4, 4f
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| 71 | sll $t2, $a1, 0x10
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| 72 |
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| 73 | sll $t3, $a1, 0x8
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| 74 | or $t3, $a1, $t3
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| 75 | sll $a3, $a1, 0x18
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| 76 | or $t3, $t3, $t2
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| 77 | or $t3, $t3, $a3
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| 78 | addu $t0, $v0, $t0
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| 79 | move $a3, $zero
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| 80 |
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| 81 | 5:
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| 82 | addiu $a3, $a3, 1
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| 83 | sltu $t2, $a3, $a0
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| 84 | sw $t3, 0($t0)
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| 85 | bnez $t2, 5b
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| 86 | addiu $t0, $t0, 4
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| 87 |
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| 88 | addu $v1, $v1, $t4
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| 89 | beq $a2, $t4, 0f
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| 90 | subu $t1, $t1, $t4
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| 91 |
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| 92 | 4:
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| 93 | addiu $t1, $t1, 1
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| 94 | addu $t1, $v1, $t1
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| 95 | sb $a1, 0($v1)
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| 96 |
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| 97 | 6:
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| 98 | addiu $v1, $v1, 1
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| 99 | bnel $v1, $t1, 6b
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| 100 | sb $a1, 0($v1)
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| 101 |
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| 102 | 0:
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| 103 | jr $ra
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| 104 | nop
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| 105 |
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| 106 | 1:
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| 107 | j 7b
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| 108 | move $t0, $a2
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| 109 |
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| 110 | 2:
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| 111 | bnez $t0, 3b
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| 112 | nop
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| 113 |
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| 114 | j 8b
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| 115 | subu $a2, $a2, $t0
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| 116 |
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| 117 | memcpy:
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| 118 | move $t2, $a0 /* save dst */
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| 119 |
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| 120 | addiu $v0, $a1, 3
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| 121 | li $v1, -4 /* 0xfffffffffffffffc */
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| 122 | and $v0, $v0, $v1
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| 123 | beq $a1, $v0, 3f
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| 124 | move $t0, $a0
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| 125 |
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| 126 | 0:
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| 127 | beq $a2, $zero, 2f
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| 128 | move $a3, $zero
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| 129 |
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| 130 | 1:
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| 131 | addu $v0, $a1, $a3
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| 132 | lbu $a0, 0($v0)
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| 133 | addu $v1, $t0, $a3
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| 134 | addiu $a3, $a3, 1
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| 135 | bne $a3, $a2, 1b
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| 136 | sb $a0, 0($v1)
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| 137 |
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| 138 | 2:
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| 139 | jr $ra
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| 140 | move $v0, $t2
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| 141 |
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| 142 | 3:
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| 143 | addiu $v0, $a0, 3
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| 144 | and $v0, $v0, $v1
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| 145 | bne $a0, $v0, 0b
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| 146 | srl $t1, $a2, 2
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| 147 |
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| 148 | beq $t1, $zero, 5f
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| 149 | move $a3, $zero
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| 150 |
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| 151 | move $a3, $zero
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| 152 | move $a0, $zero
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| 153 |
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| 154 | 4:
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| 155 | addu $v0, $a1, $a0
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| 156 | lw $v1, 0($v0)
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| 157 | addiu $a3, $a3, 1
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| 158 | addu $v0, $t0, $a0
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| 159 | sw $v1, 0($v0)
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| 160 | bne $a3, $t1, 4b
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| 161 | addiu $a0, $a0, 4
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| 162 |
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| 163 | 5:
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| 164 | andi $a2, $a2, 0x3
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| 165 | beq $a2, $zero, 2b
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| 166 | nop
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| 167 |
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| 168 | sll $v0, $a3, 2
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| 169 | addu $t1, $v0, $t0
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| 170 | move $a3, $zero
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| 171 | addu $t0, $v0, $a1
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| 172 |
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| 173 | 6:
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| 174 | addu $v0, $t0, $a3
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| 175 | lbu $a0, 0($v0)
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| 176 | addu $v1, $t1, $a3
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| 177 | addiu $a3, $a3, 1
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| 178 | bne $a3, $a2, 6b
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| 179 | sb $a0, 0($v1)
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| 180 |
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| 181 | jr $ra
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| 182 | move $v0, $t2
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