xref: /openbmc/linux/arch/arm/lib/call_with_stack.S (revision 0bf49ffb) 
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/lib/call_with_stack.S
4 *
5 * Copyright (C) 2011 ARM Ltd.
6 * Written by Will Deacon <will.deacon@arm.com>
7 */
8
9#include <linux/linkage.h>
10#include <asm/assembler.h>
11
12/*
13 * void call_with_stack(void (*fn)(void *), void *arg, void *sp)
14 *
15 * Change the stack to that pointed at by sp, then invoke fn(arg) with
16 * the new stack.
17 */
18ENTRY(call_with_stack)
19	str	sp, [r2, #-4]!
20	str	lr, [r2, #-4]!
21
22	mov	sp, r2
23	mov	r2, r0
24	mov	r0, r1
25
26	badr	lr, 1f
27	ret	r2
28
291:	ldr	lr, [sp]
30	ldr	sp, [sp, #4]
31	ret	lr
32ENDPROC(call_with_stack)
33