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115 lines
2.4 KiB
ArmAsm
115 lines
2.4 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_add(volatile int *atom, int val) */
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func_begin _atom_add
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push {r4}
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1: ldrex r2, [r0] /* int old = __ldrex(atom) */
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add r3, r2, r1 /* int new = old + val */
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strex r4, r3, [r0] /* int err = __strex(atom, new) */
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teq r4, #0 /* if (err) */
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bne 1b /* goto 1 */
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dmb /* data memory barrier */
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mov r0, r2 /* return old */
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pop {r4}
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bx lr
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func_end _atom_add
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/* these are the same as _atom_add except for the instruction
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* in the LDREX/STREX pair, so i'm not gonna annotate them */
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func_begin _atom_sub
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push {r4}
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1: ldrex r2, [r0]
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sub r3, r2, r1
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strex r4, r3, [r0]
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teq r4, #0
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bne 1b
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dmb
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mov r0, r2
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pop {r4}
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bx lr
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func_end _atom_sub
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func_begin _atom_and
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push {r4}
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1: ldrex r2, [r0]
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and r3, r2, r1
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strex r4, r3, [r0]
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teq r4, #0
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bne 1b
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dmb
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mov r0, r2
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pop {r4}
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bx lr
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func_end _atom_and
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func_begin _atom_or
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push {r4}
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1: ldrex r2, [r0]
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orr r3, r2, r1
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strex r4, r3, [r0]
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teq r4, #0
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bne 1b
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dmb
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mov r0, r2
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pop {r4}
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bx lr
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func_end _atom_or
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func_begin _atom_xor
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push {r4}
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1: ldrex r2, [r0]
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eor r3, r2, r1
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strex r4, r3, [r0]
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teq r4, #0
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bne 1b
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dmb
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mov r0, r2
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pop {r4}
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bx lr
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func_end _atom_xor
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/* int _atom_xchg(volatile int *atom, int val) */
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func_begin _atom_xchg
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ldrex r2, [r0] /* int old = __ldrex(atom) */
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strex r3, r1, [r0] /* int err = __strex(atom, val) */
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teq r3, #0 /* if (err) */
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bne _atom_xchg /* goto _atom_xchg */
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dmb /* data memory barrier */
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mov r0, r2 /* return old */
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bx lr
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func_end _atom_xchg
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/* int _atom_cmpxchg(volatile int *atom, int cmp, int val) */
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func_begin _atom_cmpxchg
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push {r4}
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1: mov r4, #0 /* int err = 0 */
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ldrex r3, [r0] /* int old = __ldrex(atom) */
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teq r3, r1 /* if (old == cmp) */
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it eq
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strexeq r4, r1, [r0] /* err = __strex(atom, val) */
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teq r4, #0 /* if (err) */
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bne 1b /* goto 1b */
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dmb /* data memory barrier */
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mov r0, r3 /* return old */
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pop {r4}
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bx lr
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func_end _atom_cmpxchg
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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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