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33 lines
577 B
ArmAsm
33 lines
577 B
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* arch/arm/lib/call_with_stack.S
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*
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* Copyright (C) 2011 ARM Ltd.
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* Written by Will Deacon <will.deacon@arm.com>
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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/*
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* void call_with_stack(void (*fn)(void *), void *arg, void *sp)
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*
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* Change the stack to that pointed at by sp, then invoke fn(arg) with
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* the new stack.
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*/
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ENTRY(call_with_stack)
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str sp, [r2, #-4]!
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str lr, [r2, #-4]!
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mov sp, r2
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mov r2, r0
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mov r0, r1
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badr lr, 1f
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ret r2
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1: ldr lr, [sp]
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ldr sp, [sp, #4]
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ret lr
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ENDPROC(call_with_stack)
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