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- /* SPDX-License-Identifier: GPL-2.0 */
- // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
- #include <linux/linkage.h>
- #include <abi/entry.h>
- .text
- /*
- * int csky_cmpxchg(int oldval, int newval, int *ptr)
- *
- * If *ptr != oldval && return 1,
- * else *ptr = newval return 0.
- */
- ENTRY(csky_cmpxchg)
- USPTOKSP
- RD_MEH a3
- WR_MEH a3
- mfcr a3, epc
- addi a3, TRAP0_SIZE
- subi sp, 16
- stw a3, (sp, 0)
- mfcr a3, epsr
- stw a3, (sp, 4)
- mfcr a3, usp
- stw a3, (sp, 8)
- psrset ee
- #ifdef CONFIG_CPU_HAS_LDSTEX
- 1:
- ldex a3, (a2)
- cmpne a0, a3
- bt16 2f
- mov a3, a1
- stex a3, (a2)
- bez a3, 1b
- 2:
- sync.is
- #else
- GLOBAL(csky_cmpxchg_ldw)
- ldw a3, (a2)
- cmpne a0, a3
- bt16 3f
- GLOBAL(csky_cmpxchg_stw)
- stw a1, (a2)
- 3:
- #endif
- mvc a0
- ldw a3, (sp, 0)
- mtcr a3, epc
- ldw a3, (sp, 4)
- mtcr a3, epsr
- ldw a3, (sp, 8)
- mtcr a3, usp
- addi sp, 16
- KSPTOUSP
- rte
- END(csky_cmpxchg)
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