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Linux kernel has provided some apis for arch signal's implementation. For example: restore_saved_sigmask() set_current_blocked() restore_altstack() But in last version of csky signal.c didn't use them and some codes are confusing, so reconstruct signal.c with reference to riscv's code. Now csky signal.c implementation are very close to riscv and we can get the following benefits: - Clear code structure - The signal code of riscv and csky can be reviewed together - Promoting the unification of arch's signal implementation Also modified the related code in entry.S Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
69 lines
985 B
ArmAsm
69 lines
985 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/linkage.h>
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#include <abi/entry.h>
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.text
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/*
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* int csky_cmpxchg(int oldval, int newval, int *ptr)
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*
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* If *ptr != oldval && return 1,
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* else *ptr = newval return 0.
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*/
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ENTRY(csky_cmpxchg)
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USPTOKSP
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mfcr a3, epc
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addi a3, TRAP0_SIZE
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subi sp, 8
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stw a3, (sp, 0)
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mfcr a3, epsr
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stw a3, (sp, 4)
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psrset ee
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#ifdef CONFIG_CPU_HAS_LDSTEX
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1:
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ldex a3, (a2)
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cmpne a0, a3
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bt16 2f
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mov a3, a1
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stex a3, (a2)
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bez a3, 1b
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2:
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sync.is
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#else
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1:
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ldw a3, (a2)
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cmpne a0, a3
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bt16 3f
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2:
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stw a1, (a2)
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3:
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#endif
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mvc a0
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ldw a3, (sp, 0)
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mtcr a3, epc
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ldw a3, (sp, 4)
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mtcr a3, epsr
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addi sp, 8
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KSPTOUSP
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rte
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END(csky_cmpxchg)
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#ifndef CONFIG_CPU_HAS_LDSTEX
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/*
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* Called from tlbmodified exception
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*/
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ENTRY(csky_cmpxchg_fixup)
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mfcr a0, epc
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lrw a1, 2b
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cmpne a1, a0
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bt 1f
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subi a1, (2b - 1b)
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stw a1, (sp, LSAVE_PC)
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1:
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rts
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END(csky_cmpxchg_fixup)
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#endif
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