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 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * 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. + */ + +#include <asm/sysreg.h> + + .text + .global __switch_to + .type __switch_to, @function + + /* Switch thread context from "prev" to "next", returning "last" + * r12 : prev + * r11 : &prev->thread + 1 + * r10 : &next->thread + */ +__switch_to: + stm --r11, r0,r1,r2,r3,r4,r5,r6,r7,sp,lr + mfsr r9, SYSREG_SR + st.w --r11, r9 + ld.w r8, r10++ + /* + * schedule() may have been called from a mode with a different + * set of registers. Make sure we don't lose anything here. + */ + pushm r10,r12 + mtsr SYSREG_SR, r8 + frs /* flush the return stack */ + sub pc, -2 /* flush the pipeline */ + popm r10,r12 + ldm r10++, r0,r1,r2,r3,r4,r5,r6,r7,sp,pc + .size __switch_to, . - __switch_to |