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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/avr32/kernel/switch_to.S
Initial import
Diffstat (limited to 'arch/avr32/kernel/switch_to.S')
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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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+++ b/arch/avr32/kernel/switch_to.S
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+/*
+ * 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