context_gcc.S
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/*
* File : context.S
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2010, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2010-03-27 Kyle First version
*/
#define AVR32_SR 0
#define AVR32_SR_GM_OFFSET 16
.text
/*
* rt_base_t rt_hw_interrupt_disable()
*/
.globl rt_hw_interrupt_disable
.type rt_hw_interrupt_disable, %function
rt_hw_interrupt_disable:
ssrf AVR32_SR_GM_OFFSET
mov pc, lr
/*
* void rt_hw_interrupt_enable(rt_base_t level)
*/
.globl rt_hw_interrupt_enable
.type rt_hw_interrupt_enable, %function
rt_hw_interrupt_enable:
csrf AVR32_SR_GM_OFFSET
mov pc, lr
/*
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)/*
* r8 --> from
* r9 --> to
*/
.globl rt_hw_context_switch
.type rt_hw_context_switch, %function
rt_hw_context_switch:
ssrf AVR32_SR_GM_OFFSET /* Disable global interrupt */
stm --sp, r8-r12, lr /* Push R8-R12, LR */
st.w --sp, lr /* Push LR (instead of PC) */
mfsr r8, AVR32_SR /* Read Status Register */
cbr r8, AVR32_SR_GM_OFFSET /* Clear GM bit */
st.w --sp, r8 /* Push SR */
stm --sp, r0-r7 /* Push R0-R7 */
/* Stack layout: R8-R12, LR, PC, SR, R0-R7 */
st.w r12[0], sp /* Store SP in preempted tasks TCB */
ld.w sp, r11[0] /* Get new task stack pointer */
ldm sp++, r0-r7 /* pop R0-R7 */
ld.w r8, sp++ /* pop SR */
mtsr AVR32_SR, r8 /* Restore SR */
ldm sp++, r8-r12, lr, pc/* Pop R8-R12, LR, PC and resume to thread */
/*
* void rt_hw_context_switch_to(rt_uint32 to)/*
* r0 --> to
*/
.globl rt_hw_context_switch_to
.type rt_hw_context_switch_to, %function
rt_hw_context_switch_to:
ld.w sp, r12[0] /* Get new task stack pointer */
ldm sp++, r0-r7 /* pop R0-R7 */
ld.w r8, sp++ /* pop SR */
mtsr AVR32_SR, r8 /* Restore SR */
ldm sp++, r8-r12, lr, pc/* Pop R8-R12, LR, PC and resume execution */
/*
* void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/*
*/
.globl rt_thread_switch_interrupt_flag
.globl rt_interrupt_from_thread
.globl rt_interrupt_to_thread
.globl rt_hw_context_switch_interrupt
.type rt_hw_context_switch_interrupt, %function
rt_hw_context_switch_interrupt:
lda.w r8, rt_thread_switch_interrupt_flag
ld.w r9, r8[0]
cp.w r9, 1
breq _reswitch
mov r9, 1
st.w r8[0], r9
lda.w r8, rt_interrupt_from_thread
st.w r8[0], r12
_reswitch:
lda.w r8, rt_interrupt_to_thread
st.w r8[0], r11
mov pc, lr