1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* Fallback per-CPU frame pointer holder
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #ifndef _ASM_GENERIC_IRQ_REGS_H
9 #define _ASM_GENERIC_IRQ_REGS_H
10
11 #include <linux/percpu.h>
12
13 /*
14 * Per-cpu current frame pointer - the location of the last exception frame on
15 * the stack
16 */
17 DECLARE_PER_CPU(struct pt_regs *, __irq_regs);
18
19 static inline struct pt_regs *get_irq_regs(void)
20 {
21 return __this_cpu_read(__irq_regs);
22 }
23
24 static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
25 {
26 struct pt_regs *old_regs;
27
28 old_regs = __this_cpu_read(__irq_regs);
29 __this_cpu_write(__irq_regs, new_regs);
30 return old_regs;
31 }
32
33 #endif /* _ASM_GENERIC_IRQ_REGS_H */
34
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