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| /*
| * 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
|
| badr lr, 1f
| ret r2
|
| 1: ldr lr, [sp]
| ldr sp, [sp, #4]
| ret lr
| ENDPROC(call_with_stack)
|
|
