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cpu: cortexm_common: explicitly define isr_pendsv and isr_svc

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This commit is contained in:
Kaspar Schleiser 2016-08-10 16:04:56 +02:00
parent 25a6ef5273
commit 0bd2805b0c
1 changed files with 8 additions and 9 deletions
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17
cpu/cortexm_common/thread_arch.c
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@ -296,17 +296,12 @@ void thread_arch_yield(void)
SCB->ICSR |= SCB_ICSR_PENDSVSET_Msk;
}
__attribute__((naked)) void arch_context_switch(void)
{
void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
__asm__ volatile (
/* PendSV handler entry point */
".global isr_pendsv \n"
".thumb_func \n"
"isr_pendsv: \n"
/* save context by pushing unsaved registers to the stack */
/* {r0-r3,r12,LR,PC,xPSR} are saved automatically on exception entry */
".thumb_func \n"
"context_save:"
"mrs r0, psp \n" /* get stack pointer from user mode */
#if defined(CPU_ARCH_CORTEX_M0) || defined(CPU_ARCH_CORTEX_M0PLUS)
"mov r12, sp \n" /* remember the exception SP */
@ -332,11 +327,15 @@ __attribute__((naked)) void arch_context_switch(void)
"ldr r1, =sched_active_thread \n" /* load address of current tcb */
"ldr r1, [r1] \n" /* dereference pdc */
"str r0, [r1] \n" /* write r0 to pdc->sp */
"bl isr_svc \n" /* continue with svc */
);
}
void __attribute__((naked)) __attribute__((used)) isr_svc(void) {
__asm__ volatile (
/* SVC handler entry point */
/* PendSV will continue from above and through this part as well */
".global isr_svc \n"
/* PendSV will continue here as well (via jump) */
".thumb_func \n"
"isr_svc: \n"
/* perform scheduling */
"bl sched_run \n"
/* restore context and return from exception */