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-rw-r--r--arch/avr32/kernel/switch_to.S35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/avr32/kernel/switch_to.S b/arch/avr32/kernel/switch_to.S
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1/*
2 * Copyright (C) 2004-2006 Atmel Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <asm/sysreg.h>
10
11 .text
12 .global __switch_to
13 .type __switch_to, @function
14
15 /* Switch thread context from "prev" to "next", returning "last"
16 * r12 : prev
17 * r11 : &prev->thread + 1
18 * r10 : &next->thread
19 */
20__switch_to:
21 stm --r11, r0,r1,r2,r3,r4,r5,r6,r7,sp,lr
22 mfsr r9, SYSREG_SR
23 st.w --r11, r9
24 ld.w r8, r10++
25 /*
26 * schedule() may have been called from a mode with a different
27 * set of registers. Make sure we don't lose anything here.
28 */
29 pushm r10,r12
30 mtsr SYSREG_SR, r8
31 frs /* flush the return stack */
32 sub pc, -2 /* flush the pipeline */
33 popm r10,r12
34 ldm r10++, r0,r1,r2,r3,r4,r5,r6,r7,sp,pc
35 .size __switch_to, . - __switch_to