52 lines
1.1 KiB
ArmAsm
52 lines
1.1 KiB
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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#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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