170 lines
3.7 KiB
ArmAsm
170 lines
3.7 KiB
ArmAsm
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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.text
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.align
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.global android_atomic_write
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.global android_atomic_inc
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.global android_atomic_dec
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.global android_atomic_add
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.global android_atomic_and
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.global android_atomic_or
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.global android_atomic_swap
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.global android_atomic_cmpxchg
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/* FIXME: On SMP systems memory barriers may be needed */
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#warning "this file is not safe with SMP systems"
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_write
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* input: r0=value, r1=address
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* output: void
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*/
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android_atomic_write:
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1: ldrex r12, [r1]
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strex r12, r0, [r1]
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cmp r12, #0
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bne 1b
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bx lr
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_inc
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* input: r0 = address
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* output: r0 = old value
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*/
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android_atomic_inc:
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mov r12, r0
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1: ldrex r0, [r12]
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add r2, r0, #1
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strex r1, r2, [r12]
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cmp r1, #0
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bxeq lr
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b 1b
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_dec
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* input: r0=address
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* output: r0 = old value
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*/
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android_atomic_dec:
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mov r12, r0
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1: ldrex r0, [r12]
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sub r2, r0, #1
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strex r1, r2, [r12]
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cmp r1, #0
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bxeq lr
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b 1b
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_add
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* input: r0=value, r1=address
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* output: r0 = old value
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*/
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android_atomic_add:
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mov r12, r0
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1: ldrex r0, [r1]
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add r2, r0, r12
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strex r3, r2, [r1]
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cmp r3, #0
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bxeq lr
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b 1b
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_and
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* input: r0=value, r1=address
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* output: r0 = old value
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*/
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android_atomic_and:
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mov r12, r0
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1: ldrex r0, [r1]
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and r2, r0, r12
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strex r3, r2, [r1]
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cmp r3, #0
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bxeq lr
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b 1b
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_or
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* input: r0=value, r1=address
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* output: r0 = old value
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*/
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android_atomic_or:
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mov r12, r0
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1: ldrex r0, [r1]
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orr r2, r0, r12
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strex r3, r2, [r1]
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cmp r3, #0
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bxeq lr
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b 1b
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_swap
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* input: r0=value, r1=address
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* output: r0 = old value
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*/
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android_atomic_swap:
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swp r0, r0, [r1]
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bx lr
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_cmpxchg
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* input: r0=oldvalue, r1=newvalue, r2=address
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* output: r0 = 0 (xchg done) or non-zero (xchg not done)
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*/
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android_atomic_cmpxchg:
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mov r12, r1
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ldrex r3, [r2]
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eors r0, r0, r3
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strexeq r0, r12, [r2]
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bx lr
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/*
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* ----------------------------------------------------------------------------
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* android_atomic_cmpxchg_64
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* input: r0-r1=oldvalue, r2-r3=newvalue, arg4 (on stack)=address
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* output: r0 = 0 (xchg done) or non-zero (xchg not done)
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*/
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/* TODO: NEED IMPLEMENTATION FOR THIS ARCHITECTURE */
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