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47 lines
1.3 KiB
ArmAsm
47 lines
1.3 KiB
ArmAsm
/* See the end of this file for copyright, license, and warranty information. */
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.include "asm.S"
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.text
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/* int _atom_get(int *count); */
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func_begin _atom_get
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ldrex r1, [r0] /* int tmp = atom->count */
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add r2, r1, #1 /* int newval = tmp + 1 */
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strex r3, r2, [r0] /* atom->count = newval */
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teq r3, #0 /* store successful? */
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bne _atom_get /* -> goto _atom_get to try again if not */
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dmb /* data memory barrier */
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mov r0, r2 /* return newval */
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bx lr
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func_end _atom_get
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/* int _atom_put(int *count); */
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func_begin _atom_put
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ldrex r1, [r0] /* int tmp = atom->count */
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sub r2, r1, #1 /* int newval = tmp - 1 */
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strex r3, r2, [r0] /* atom->count = newval */
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teq r3, #0 /* store successful? */
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bne _atom_put /* -> goto _atom_put to try again if not */
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dmb /* data memory barrier */
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mov r0, r2 /* return newval */
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bx lr
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func_end _atom_put
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/*
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* This file is part of Ardix.
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* Copyright (c) 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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