RIOT-OS/RIOT
RIOT-OS/RIOT
1
0
Fork 0
mirror of https://github.com/RIOT-OS/RIOT.git synced 2024-12-29 04:50:03 +01:00
Code Releases Activity

Merge pull request #15086 from maribu/ibs-after-stackpointer

Browse Source 
cpu/cortexm_common: Flush pipeline after triggering PendSV
This commit is contained in:
Kaspar Schleiser 2020-09-26 21:05:04 +02:00 committed by GitHub
commit 9334897ab9
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
cpu/cortexm_common/thread_arch.c
View File

@ -297,6 +297,9 @@ void thread_yield_higher(void)
/* trigger the PENDSV interrupt to run scheduler and schedule new thread if
* applicable */
SCB->ICSR = SCB_ICSR_PENDSVSET_Msk;
/* flush the pipeline. Otherwise we risk that subsequent instructions are
* executed before the IRQ has actually triggered */
__ISB();
}
void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
@ -384,7 +387,7 @@ void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
"mov r1, r9 \n"
"mov r2, r10 \n"
"mov r3, r11 \n"
"push {r0-r7,lr} \n" /* now push them onto the stack */
"push {r0-r7,lr} \n" /* now push them onto the stack */
/* SP should match the expected SP calculated above from here on */
/* current thread context is now saved */
@ -404,7 +407,7 @@ void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
/* restore the application mode stack pointer PSP */
"mov r1, sp \n" /* restore the user mode SP */
"msr psp, r1 \n" /* for this write it to the PSP reg */
"mov sp, r12 \n" /* and get the parked MSR SP back */
"mov sp, r12 \n" /* and get the parked MSR SP back */
"bx r0 \n" /* load exception return value to PC,
* causes end of exception*/
#endif