4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2001,2004 Develer S.r.l. (http://www.develer.com/)
30 * Copyright 1999,2000,2001 Bernardo Innocenti <bernie@develer.com>
34 * \brief ARM context switch
36 * \version $Id: proc.c 18271 2007-10-11 14:51:31Z batt $
38 * \author Stefano Fedrigo <aleph@develer.com>
39 * \author Francesco Sacchi <batt@develer.com>
44 * NOTE: At each change of this function affecting proc.c
45 * (i.e. arguments, data stored in the stack) bump up version
46 * number in asm_switch_version().
49 /* void asm_switch_context(void **new_sp, void **save_sp) */
50 .globl asm_switch_context
52 mrs r2, cpsr /* Save status. */
53 stmfd sp!, {r2, r4-r11, lr} /* Save registers. */
55 str sp, [r1] /* Save old stack pointer. */
56 ldr sp, [r0] /* Load new stack pointer */
58 ldmfd sp!, {r2, r4-r11, lr} /* Load new registers. */
59 msr cpsr, r2 /* restore flags reg. */
64 /* int asm_switch_version(void) */
65 .globl asm_switch_version