The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | |
| 18 | .text |
| 19 | .align |
| 20 | |
| 21 | .global android_atomic_write |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 22 | .type android_atomic_write, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 23 | |
| 24 | .global android_atomic_inc |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 25 | .type android_atomic_inc, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 26 | .global android_atomic_dec |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 27 | .type android_atomic_dec, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 28 | |
| 29 | .global android_atomic_add |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 30 | .type android_atomic_add, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 31 | .global android_atomic_and |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 32 | .type android_atomic_and, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 33 | .global android_atomic_or |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 34 | .type android_atomic_or, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 35 | |
| 36 | .global android_atomic_swap |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 37 | .type android_atomic_swap, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 38 | |
| 39 | .global android_atomic_cmpxchg |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame^] | 40 | .type android_atomic_cmpxchg, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 41 | |
| 42 | |
| 43 | |
| 44 | /* FIXME: On SMP systems memory barriers may be needed */ |
| 45 | #warning "this file is not safe with SMP systems" |
| 46 | |
| 47 | |
| 48 | /* |
| 49 | * ---------------------------------------------------------------------------- |
| 50 | * android_atomic_write |
| 51 | * input: r0=value, r1=address |
| 52 | * output: void |
| 53 | */ |
| 54 | |
| 55 | android_atomic_write: |
Mathias Agopian | ca5e0bc | 2009-09-03 14:49:58 -0700 | [diff] [blame] | 56 | str r0, [r1] |
| 57 | bx lr; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 58 | |
| 59 | /* |
| 60 | * ---------------------------------------------------------------------------- |
| 61 | * android_atomic_inc |
| 62 | * input: r0 = address |
| 63 | * output: r0 = old value |
| 64 | */ |
| 65 | |
| 66 | android_atomic_inc: |
| 67 | mov r12, r0 |
| 68 | 1: ldrex r0, [r12] |
| 69 | add r2, r0, #1 |
| 70 | strex r1, r2, [r12] |
| 71 | cmp r1, #0 |
| 72 | bxeq lr |
| 73 | b 1b |
| 74 | |
| 75 | /* |
| 76 | * ---------------------------------------------------------------------------- |
| 77 | * android_atomic_dec |
| 78 | * input: r0=address |
| 79 | * output: r0 = old value |
| 80 | */ |
| 81 | |
| 82 | android_atomic_dec: |
| 83 | mov r12, r0 |
| 84 | 1: ldrex r0, [r12] |
| 85 | sub r2, r0, #1 |
| 86 | strex r1, r2, [r12] |
| 87 | cmp r1, #0 |
| 88 | bxeq lr |
| 89 | b 1b |
| 90 | |
| 91 | |
| 92 | /* |
| 93 | * ---------------------------------------------------------------------------- |
| 94 | * android_atomic_add |
| 95 | * input: r0=value, r1=address |
| 96 | * output: r0 = old value |
| 97 | */ |
| 98 | |
| 99 | android_atomic_add: |
| 100 | mov r12, r0 |
| 101 | 1: ldrex r0, [r1] |
| 102 | add r2, r0, r12 |
| 103 | strex r3, r2, [r1] |
| 104 | cmp r3, #0 |
| 105 | bxeq lr |
| 106 | b 1b |
| 107 | |
| 108 | /* |
| 109 | * ---------------------------------------------------------------------------- |
| 110 | * android_atomic_and |
| 111 | * input: r0=value, r1=address |
| 112 | * output: r0 = old value |
| 113 | */ |
| 114 | |
| 115 | android_atomic_and: |
| 116 | mov r12, r0 |
| 117 | 1: ldrex r0, [r1] |
| 118 | and r2, r0, r12 |
| 119 | strex r3, r2, [r1] |
| 120 | cmp r3, #0 |
| 121 | bxeq lr |
| 122 | b 1b |
| 123 | |
| 124 | |
| 125 | /* |
| 126 | * ---------------------------------------------------------------------------- |
| 127 | * android_atomic_or |
| 128 | * input: r0=value, r1=address |
| 129 | * output: r0 = old value |
| 130 | */ |
| 131 | |
| 132 | android_atomic_or: |
| 133 | mov r12, r0 |
| 134 | 1: ldrex r0, [r1] |
| 135 | orr r2, r0, r12 |
| 136 | strex r3, r2, [r1] |
| 137 | cmp r3, #0 |
| 138 | bxeq lr |
| 139 | b 1b |
| 140 | |
| 141 | /* |
| 142 | * ---------------------------------------------------------------------------- |
| 143 | * android_atomic_swap |
| 144 | * input: r0=value, r1=address |
| 145 | * output: r0 = old value |
| 146 | */ |
| 147 | |
| 148 | android_atomic_swap: |
| 149 | swp r0, r0, [r1] |
| 150 | bx lr |
| 151 | |
| 152 | /* |
| 153 | * ---------------------------------------------------------------------------- |
| 154 | * android_atomic_cmpxchg |
| 155 | * input: r0=oldvalue, r1=newvalue, r2=address |
| 156 | * output: r0 = 0 (xchg done) or non-zero (xchg not done) |
| 157 | */ |
| 158 | |
| 159 | android_atomic_cmpxchg: |
| 160 | mov r12, r1 |
| 161 | ldrex r3, [r2] |
| 162 | eors r0, r0, r3 |
| 163 | strexeq r0, r12, [r2] |
| 164 | bx lr |
| 165 | |
| 166 | |
| 167 | |
| 168 | /* |
| 169 | * ---------------------------------------------------------------------------- |
| 170 | * android_atomic_cmpxchg_64 |
| 171 | * input: r0-r1=oldvalue, r2-r3=newvalue, arg4 (on stack)=address |
| 172 | * output: r0 = 0 (xchg done) or non-zero (xchg not done) |
| 173 | */ |
| 174 | /* TODO: NEED IMPLEMENTATION FOR THIS ARCHITECTURE */ |