diff options
Diffstat (limited to 'ports/cortex_m0/ac6/src')
| -rw-r--r-- | ports/cortex_m0/ac6/src/tx_thread_system_return.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/ports/cortex_m0/ac6/src/tx_thread_system_return.S b/ports/cortex_m0/ac6/src/tx_thread_system_return.S index fc62c0c6..bd7a23f3 100644 --- a/ports/cortex_m0/ac6/src/tx_thread_system_return.S +++ b/ports/cortex_m0/ac6/src/tx_thread_system_return.S @@ -72,12 +72,15 @@ _tx_thread_system_return: LDR r0, =0x10000000 @ Load PENDSVSET bit LDR r1, =0xE000ED04 @ Load NVIC base STR r0, [r1] @ Set PENDSVBIT in ICSR + DSB #0xF @ Ensure memory access is complete + ISB #0xF @ Flush pipeline MRS r0, IPSR @ Pickup IPSR CMP r0, #0 @ Is it a thread returning? BNE _isr_context @ If ISR, skip interrupt enable MRS r1, PRIMASK @ Thread context returning, pickup PRIMASK CPSIE i @ Enable interrupts MSR PRIMASK, r1 @ Restore original interrupt posture + ISB #0xF @ Flush pipeline _isr_context: BX lr @ Return to caller @/* } */ |