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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/lib/call_with_stack.S
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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 <[email protected]>

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 */

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#include <linux/linkage.h>

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#include <asm/assembler.h>

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#include <asm/unwind.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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 * The sequence below follows the APCS frame convention for frame pointer

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 * unwinding, and implements the unwinder annotations needed by the EABI

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 * unwinder.

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 */

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ENTRY(call_with_stack)

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#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)

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	mov	ip, sp

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	push	{fp, ip, lr, pc}

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	sub	fp, ip, #4

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#else

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UNWIND( .fnstart		)

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UNWIND( .save	{fpreg, lr}	)

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	push	{fpreg, lr}

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UNWIND( .setfp	fpreg, sp	)

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	mov	fpreg, sp

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#endif

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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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	bl_r	r2

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#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)

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	ldmdb	fp, {fp, sp, pc}

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#else

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	mov	sp, fpreg

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	pop	{fpreg, pc}

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UNWIND( .fnend			)

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#endif

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	.globl call_with_stack_end

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call_with_stack_end:

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ENDPROC(call_with_stack)

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