The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 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 | #include <machine/cpu-features.h> |
| 18 | |
| 19 | /* |
Vinay HARUGOP | 0260847 | 2009-09-10 00:31:12 +0530 | [diff] [blame] | 20 | * NOTE: these atomic operations are SMP safe on all architectures. |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 21 | */ |
| 22 | |
| 23 | .text |
| 24 | .align |
| 25 | |
| 26 | .global android_atomic_write |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 27 | .type android_atomic_write, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 28 | |
| 29 | .global android_atomic_inc |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 30 | .type android_atomic_inc, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 31 | .global android_atomic_dec |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 32 | .type android_atomic_dec, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 33 | |
| 34 | .global android_atomic_add |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 35 | .type android_atomic_add, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 36 | .global android_atomic_and |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 37 | .type android_atomic_and, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 38 | .global android_atomic_or |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 39 | .type android_atomic_or, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 40 | |
| 41 | .global android_atomic_swap |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 42 | .type android_atomic_swap, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 43 | |
| 44 | .global android_atomic_cmpxchg |
Doug Kwan | 0927990 | 2009-12-03 17:20:58 -0800 | [diff] [blame] | 45 | .type android_atomic_cmpxchg, %function |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 46 | |
| 47 | /* |
| 48 | * ---------------------------------------------------------------------------- |
| 49 | * int __kernel_cmpxchg(int oldval, int newval, int *ptr) |
| 50 | * clobbered: r3, ip, flags |
| 51 | * return 0 if a swap was made, non-zero otherwise. |
| 52 | */ |
| 53 | |
| 54 | .equ kernel_cmpxchg, 0xFFFF0FC0 |
| 55 | .equ kernel_atomic_base, 0xFFFF0FFF |
| 56 | |
| 57 | /* |
| 58 | * ---------------------------------------------------------------------------- |
| 59 | * android_atomic_write |
| 60 | * input: r0=value, r1=address |
| 61 | * output: void |
| 62 | */ |
| 63 | |
| 64 | android_atomic_write: |
Mathias Agopian | ca5e0bc | 2009-09-03 14:49:58 -0700 | [diff] [blame] | 65 | str r0, [r1] |
| 66 | bx lr; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 67 | |
| 68 | /* |
| 69 | * ---------------------------------------------------------------------------- |
| 70 | * android_atomic_inc |
| 71 | * input: r0 = address |
| 72 | * output: r0 = old value |
| 73 | */ |
| 74 | |
| 75 | android_atomic_inc: |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 76 | .fnstart |
| 77 | .save {r4, lr} |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 78 | stmdb sp!, {r4, lr} |
| 79 | mov r2, r0 |
| 80 | 1: @ android_atomic_inc |
| 81 | ldr r0, [r2] |
| 82 | mov r3, #kernel_atomic_base |
| 83 | #ifdef __ARM_HAVE_PC_INTERWORK |
| 84 | add lr, pc, #4 |
| 85 | add r1, r0, #1 |
| 86 | add pc, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 87 | #else |
| 88 | add r1, r0, #1 |
| 89 | add r3, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 90 | mov lr, pc |
| 91 | bx r3 |
| 92 | #endif |
| 93 | bcc 1b |
| 94 | sub r0, r1, #1 |
| 95 | ldmia sp!, {r4, lr} |
| 96 | bx lr |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 97 | .fnend |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 98 | |
| 99 | /* |
| 100 | * ---------------------------------------------------------------------------- |
| 101 | * android_atomic_dec |
| 102 | * input: r0=address |
| 103 | * output: r0 = old value |
| 104 | */ |
| 105 | |
| 106 | android_atomic_dec: |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 107 | .fnstart |
| 108 | .save {r4, lr} |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 109 | stmdb sp!, {r4, lr} |
| 110 | mov r2, r0 |
| 111 | 1: @ android_atomic_dec |
| 112 | ldr r0, [r2] |
| 113 | mov r3, #kernel_atomic_base |
| 114 | #ifdef __ARM_HAVE_PC_INTERWORK |
| 115 | add lr, pc, #4 |
| 116 | sub r1, r0, #1 |
| 117 | add pc, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 118 | #else |
| 119 | sub r1, r0, #1 |
| 120 | add r3, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 121 | mov lr, pc |
| 122 | bx r3 |
| 123 | #endif |
| 124 | bcc 1b |
| 125 | add r0, r1, #1 |
| 126 | ldmia sp!, {r4, lr} |
| 127 | bx lr |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 128 | .fnend |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 129 | |
| 130 | /* |
| 131 | * ---------------------------------------------------------------------------- |
| 132 | * android_atomic_add |
| 133 | * input: r0=value, r1=address |
| 134 | * output: r0 = old value |
| 135 | */ |
| 136 | |
| 137 | android_atomic_add: |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 138 | .fnstart |
| 139 | .save {r4, lr} |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 140 | stmdb sp!, {r4, lr} |
| 141 | mov r2, r1 |
| 142 | mov r4, r0 |
| 143 | 1: @ android_atomic_add |
| 144 | ldr r0, [r2] |
| 145 | mov r3, #kernel_atomic_base |
| 146 | #ifdef __ARM_HAVE_PC_INTERWORK |
| 147 | add lr, pc, #4 |
| 148 | add r1, r0, r4 |
| 149 | add pc, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 150 | #else |
| 151 | add r1, r0, r4 |
| 152 | add r3, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 153 | mov lr, pc |
| 154 | bx r3 |
| 155 | #endif |
| 156 | bcc 1b |
| 157 | sub r0, r1, r4 |
| 158 | ldmia sp!, {r4, lr} |
| 159 | bx lr |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 160 | .fnend |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 161 | |
| 162 | |
| 163 | /* |
| 164 | * ---------------------------------------------------------------------------- |
| 165 | * android_atomic_and |
| 166 | * input: r0=value, r1=address |
| 167 | * output: r0 = old value |
| 168 | */ |
| 169 | |
| 170 | android_atomic_and: |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 171 | .fnstart |
| 172 | .save {r4, r5, lr} |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 173 | stmdb sp!, {r4, r5, lr} |
| 174 | mov r2, r1 /* r2 = address */ |
| 175 | mov r4, r0 /* r4 = the value */ |
| 176 | 1: @ android_atomic_and |
| 177 | ldr r0, [r2] /* r0 = address[0] */ |
| 178 | mov r3, #kernel_atomic_base |
| 179 | #ifdef __ARM_HAVE_PC_INTERWORK |
| 180 | add lr, pc, #8 |
| 181 | mov r5, r0 /* r5 = save address[0] */ |
| 182 | and r1, r0, r4 /* r1 = new value */ |
| 183 | add pc, r3, #(kernel_cmpxchg - kernel_atomic_base) /* call cmpxchg() */ |
| 184 | #else |
| 185 | mov r5, r0 /* r5 = save address[0] */ |
| 186 | and r1, r0, r4 /* r1 = new value */ |
| 187 | add r3, r3, #(kernel_cmpxchg - kernel_atomic_base) /* call cmpxchg() */ |
| 188 | mov lr, pc |
| 189 | bx r3 |
| 190 | #endif |
| 191 | bcc 1b |
| 192 | mov r0, r5 |
| 193 | ldmia sp!, {r4, r5, lr} |
| 194 | bx lr |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 195 | .fnend |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 196 | |
| 197 | /* |
| 198 | * ---------------------------------------------------------------------------- |
| 199 | * android_atomic_or |
| 200 | * input: r0=value, r1=address |
| 201 | * output: r0 = old value |
| 202 | */ |
| 203 | |
| 204 | android_atomic_or: |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 205 | .fnstart |
| 206 | .save {r4, r5, lr} |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 207 | stmdb sp!, {r4, r5, lr} |
| 208 | mov r2, r1 /* r2 = address */ |
| 209 | mov r4, r0 /* r4 = the value */ |
| 210 | 1: @ android_atomic_or |
| 211 | ldr r0, [r2] /* r0 = address[0] */ |
| 212 | mov r3, #kernel_atomic_base |
| 213 | #ifdef __ARM_HAVE_PC_INTERWORK |
| 214 | add lr, pc, #8 |
| 215 | mov r5, r0 /* r5 = save address[0] */ |
| 216 | orr r1, r0, r4 /* r1 = new value */ |
| 217 | add pc, r3, #(kernel_cmpxchg - kernel_atomic_base) /* call cmpxchg() */ |
| 218 | #else |
| 219 | mov r5, r0 /* r5 = save address[0] */ |
| 220 | orr r1, r0, r4 /* r1 = new value */ |
| 221 | add r3, r3, #(kernel_cmpxchg - kernel_atomic_base) /* call cmpxchg() */ |
| 222 | mov lr, pc |
| 223 | bx r3 |
| 224 | #endif |
| 225 | bcc 1b |
| 226 | mov r0, r5 |
| 227 | ldmia sp!, {r4, r5, lr} |
| 228 | bx lr |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 229 | .fnend |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 230 | |
| 231 | /* |
| 232 | * ---------------------------------------------------------------------------- |
| 233 | * android_atomic_swap |
| 234 | * input: r0=value, r1=address |
| 235 | * output: r0 = old value |
| 236 | */ |
| 237 | |
Vinay HARUGOP | 0260847 | 2009-09-10 00:31:12 +0530 | [diff] [blame] | 238 | /* replaced swp instruction with ldrex/strex for ARMv6 & ARMv7 */ |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 239 | android_atomic_swap: |
Vinay HARUGOP | 0260847 | 2009-09-10 00:31:12 +0530 | [diff] [blame] | 240 | #if defined (_ARM_HAVE_LDREX_STREX) |
| 241 | 1: ldrex r2, [r1] |
| 242 | strex r3, r0, [r1] |
| 243 | teq r3, #0 |
| 244 | bne 1b |
| 245 | mov r0, r2 |
| 246 | mcr p15, 0, r0, c7, c10, 5 /* or, use dmb */ |
| 247 | #else |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 248 | swp r0, r0, [r1] |
Vinay HARUGOP | 0260847 | 2009-09-10 00:31:12 +0530 | [diff] [blame] | 249 | #endif |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 250 | bx lr |
| 251 | |
| 252 | /* |
| 253 | * ---------------------------------------------------------------------------- |
| 254 | * android_atomic_cmpxchg |
| 255 | * input: r0=oldvalue, r1=newvalue, r2=address |
| 256 | * output: r0 = 0 (xchg done) or non-zero (xchg not done) |
| 257 | */ |
| 258 | |
| 259 | android_atomic_cmpxchg: |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 260 | .fnstart |
| 261 | .save {r4, lr} |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 262 | stmdb sp!, {r4, lr} |
| 263 | mov r4, r0 /* r4 = save oldvalue */ |
| 264 | 1: @ android_atomic_cmpxchg |
| 265 | mov r3, #kernel_atomic_base |
| 266 | #ifdef __ARM_HAVE_PC_INTERWORK |
| 267 | add lr, pc, #4 |
| 268 | mov r0, r4 /* r0 = oldvalue */ |
| 269 | add pc, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 270 | #else |
| 271 | mov r0, r4 /* r0 = oldvalue */ |
| 272 | add r3, r3, #(kernel_cmpxchg - kernel_atomic_base) |
| 273 | mov lr, pc |
| 274 | bx r3 |
| 275 | #endif |
| 276 | bcs 2f /* swap was made. we're good, return. */ |
| 277 | ldr r3, [r2] /* swap not made, see if it's because *ptr!=oldvalue */ |
| 278 | cmp r3, r4 |
| 279 | beq 1b |
| 280 | 2: @ android_atomic_cmpxchg |
| 281 | ldmia sp!, {r4, lr} |
| 282 | bx lr |
Ben Cheng | 8a0a527 | 2009-10-12 16:51:23 -0700 | [diff] [blame] | 283 | .fnend |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 284 | |
| 285 | /* |
| 286 | * ---------------------------------------------------------------------------- |
| 287 | * android_atomic_cmpxchg_64 |
| 288 | * input: r0-r1=oldvalue, r2-r3=newvalue, arg4 (on stack)=address |
| 289 | * output: r0 = 0 (xchg done) or non-zero (xchg not done) |
| 290 | */ |
| 291 | /* TODO: NEED IMPLEMENTATION FOR THIS ARCHITECTURE */ |