len0rd/FreeRTOS-Kernel
1
0
Fork 0
mirror of https://github.com/FreeRTOS/FreeRTOS-Kernel.git synced 2025-08-31 07:28:37 -04:00
Code Issues Projects Releases Packages Wiki Activity

Update RISC-V port to use a separate interrupt stack.

Browse source
This commit is contained in:
Richard Barry 2018-12-04 01:23:41 +00:00
parent e85ea96f78
commit 65f7a2dc19
3 changed files with 78 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

9
FreeRTOS/Source/portable/GCC/RISC-V-RV32/portASM.S
View file

@ -49,7 +49,7 @@
.extern pullMachineTimerCompareRegister
.extern pullNextTime
.extern ulTimerIncrementsForOneTick
.extern xISRStackTop
/*-----------------------------------------------------------*/
@ -136,14 +136,13 @@ vPortTrapHandler:
csrr a0, mcause
csrr a1, mepc
mv a2, sp
test_if_environment_call:
li t0, 11 /* 11 == environment call when using qemu. */
bne a0, t0, test_if_timer
addi a1, a1, 4 /* Synchronous so return to the instruction after the environment call. */
sw a1, 0( sp ) /* Save updated exception return address. */
/*_RB_ Does stack need aligning here? */
lw sp, xISRStackTop /* Switch to ISR stack before function call. */
jal vTaskSwitchContext
j processed_source
@ -167,13 +166,15 @@ test_if_timer:
add t6, t3, t5 /* Add overflow to high word of ullNextTime. */
sw t4, 0(t1) /* Store new low word of ullNextTime. */
sw t6, 4(t1) /* Store new high word of ullNextTime. */
lw sp, xISRStackTop /* Switch to ISR stack before function call. */
jal xTaskIncrementTick
beqz a0, processed_source /* Don't switch context if incrementing tick didn't unblock a task. */
jal vTaskSwitchContext
j processed_source
as_yet_unhandled:
j as_yet_unhandled /* External interrupt? */
// ebreak /* External interrupt? */
j as_yet_unhandled
processed_source:
lw sp, pxCurrentTCB /* Load pxCurrentTCB. */