diff options
Diffstat (limited to 'arch/avr32/kernel/switch_to.S')
-rw-r--r-- | arch/avr32/kernel/switch_to.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/avr32/kernel/switch_to.S b/arch/avr32/kernel/switch_to.S new file mode 100644 index 000000000000..a48d046723c5 --- /dev/null +++ b/arch/avr32/kernel/switch_to.S | |||
@@ -0,0 +1,35 @@ | |||
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 | ||