64 lines
1.1 KiB
ArmAsm
64 lines
1.1 KiB
ArmAsm
/*
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* arm_atomic.s
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*
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* Copyright (c) 2020 Semidrive Semiconductor.
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* All rights reserved.
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*
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* Description: ARM atomic function.
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*
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* Revision History:
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* -----------------
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* 2021-09-08 Wanghao.Xu Export function symbols
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*/
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INCLUDE config.h
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INCLUDE compiler.h
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PUBLIC arch_atomic_swap
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PUBLIC arch_atomic_add
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PUBLIC arch_atomic_and
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PUBLIC arch_atomic_or
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SECTION .text:CODE(2)
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arch_atomic_swap:
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.Lloop_atomic_swap:
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ldrex r12, [r0]
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strex r2, r1, [r0]
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cmp r2, #0
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bne .Lloop_atomic_swap
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mov r0, r12
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bx lr
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arch_atomic_add:
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.Lloop_atomic_add:
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ldrex r12, [r0]
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add r2, r12, r1
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strex r3, r2, [r0]
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cmp r3, #0
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bne .Lloop_atomic_add
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mov r0, r12
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bx lr
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arch_atomic_and:
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.Lloop_atomic_and:
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ldrex r12, [r0]
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and r2, r12, r1
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strex r3, r2, [r0]
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cmp r3, #0
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bne .Lloop_atomic_and
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mov r0, r12
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bx lr
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arch_atomic_or:
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.Lloop_atomic_or:
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ldrex r12, [r0]
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orr r2, r12, r1
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strex r3, r2, [r0]
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cmp r3, #0
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bne .Lloop_atomic_or
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mov r0, r12
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bx lr
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END
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