45 lines
1.2 KiB
ArmAsm
45 lines
1.2 KiB
ArmAsm
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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