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authorThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:29:04 -0800
committerThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:29:04 -0800
commite54eebbf1a908d65ee8cf80bab62821c05666d70 (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /libcutils/atomic-android-armv6.S
parenta1e1c1b106423de09bc918502e7a51d4ffe5a4ae (diff)
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auto import from //depot/cupcake/@135843
Diffstat (limited to 'libcutils/atomic-android-armv6.S')
-rw-r--r--libcutils/atomic-android-armv6.S169
1 files changed, 0 insertions, 169 deletions
diff --git a/libcutils/atomic-android-armv6.S b/libcutils/atomic-android-armv6.S
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--- a/libcutils/atomic-android-armv6.S
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-/*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-
- .text
- .align
-
- .global android_atomic_write
-
- .global android_atomic_inc
- .global android_atomic_dec
-
- .global android_atomic_add
- .global android_atomic_and
- .global android_atomic_or
-
- .global android_atomic_swap
-
- .global android_atomic_cmpxchg
-
-
-
-/* FIXME: On SMP systems memory barriers may be needed */
-#warning "this file is not safe with SMP systems"
-
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_write
- * input: r0=value, r1=address
- * output: void
- */
-
-android_atomic_write:
-1: ldrex r12, [r1]
- strex r12, r0, [r1]
- cmp r12, #0
- bne 1b
- bx lr
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_inc
- * input: r0 = address
- * output: r0 = old value
- */
-
-android_atomic_inc:
- mov r12, r0
-1: ldrex r0, [r12]
- add r2, r0, #1
- strex r1, r2, [r12]
- cmp r1, #0
- bxeq lr
- b 1b
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_dec
- * input: r0=address
- * output: r0 = old value
- */
-
-android_atomic_dec:
- mov r12, r0
-1: ldrex r0, [r12]
- sub r2, r0, #1
- strex r1, r2, [r12]
- cmp r1, #0
- bxeq lr
- b 1b
-
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_add
- * input: r0=value, r1=address
- * output: r0 = old value
- */
-
-android_atomic_add:
- mov r12, r0
-1: ldrex r0, [r1]
- add r2, r0, r12
- strex r3, r2, [r1]
- cmp r3, #0
- bxeq lr
- b 1b
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_and
- * input: r0=value, r1=address
- * output: r0 = old value
- */
-
-android_atomic_and:
- mov r12, r0
-1: ldrex r0, [r1]
- and r2, r0, r12
- strex r3, r2, [r1]
- cmp r3, #0
- bxeq lr
- b 1b
-
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_or
- * input: r0=value, r1=address
- * output: r0 = old value
- */
-
-android_atomic_or:
- mov r12, r0
-1: ldrex r0, [r1]
- orr r2, r0, r12
- strex r3, r2, [r1]
- cmp r3, #0
- bxeq lr
- b 1b
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_swap
- * input: r0=value, r1=address
- * output: r0 = old value
- */
-
-android_atomic_swap:
- swp r0, r0, [r1]
- bx lr
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_cmpxchg
- * input: r0=oldvalue, r1=newvalue, r2=address
- * output: r0 = 0 (xchg done) or non-zero (xchg not done)
- */
-
-android_atomic_cmpxchg:
- mov r12, r1
- ldrex r3, [r2]
- eors r0, r0, r3
- strexeq r0, r12, [r2]
- bx lr
-
-
-
-/*
- * ----------------------------------------------------------------------------
- * android_atomic_cmpxchg_64
- * input: r0-r1=oldvalue, r2-r3=newvalue, arg4 (on stack)=address
- * output: r0 = 0 (xchg done) or non-zero (xchg not done)
- */
-/* TODO: NEED IMPLEMENTATION FOR THIS ARCHITECTURE */