45 lines
1.2 KiB
ArmAsm
45 lines
1.2 KiB
ArmAsm
/*
|
|
* arch/arm/lib/call_with_stack.S
|
|
*
|
|
* Copyright (C) 2011 ARM Ltd.
|
|
* Written by Will Deacon <will.deacon@arm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
|
|
/*
|
|
* void call_with_stack(void (*fn)(void *), void *arg, void *sp)
|
|
*
|
|
* Change the stack to that pointed at by sp, then invoke fn(arg) with
|
|
* the new stack.
|
|
*/
|
|
ENTRY(call_with_stack)
|
|
str sp, [r2, #-4]!
|
|
str lr, [r2, #-4]!
|
|
|
|
mov sp, r2
|
|
mov r2, r0
|
|
mov r0, r1
|
|
|
|
adr lr, BSYM(1f)
|
|
ret r2
|
|
|
|
1: ldr lr, [sp]
|
|
ldr sp, [sp, #4]
|
|
ret lr
|
|
ENDPROC(call_with_stack)
|