| /* |
| * 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) |