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shared/runtime/mpirq: Check separate hard IRQ stack correctly.

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On the zephyr port, hard IRQ handlers run with a separate stack on a
different thread, so each call to mp_irq_dispatch() and mp_irq_handler()
has to be wrapped with adjustments to the stack-limit checker.

Move these adjustments into the shared mp_irq_dispatch(), introducing
MICROPY_STACK_SIZE_HARD_IRQ which a port can define to non-zero if it
uses a separate stack for hard IRQ handlers. We only need wrap the hard
dispatch case. This should reduce binary size on zephyr without affecting
other ports.

Signed-off-by: Chris Webb <chris@arachsys.com>
This commit is contained in:
Chris Webb
2025-09-09 15:40:51 +01:00
committed by Damien George
parent b9523fd58c
commit 81985d20c9
6 changed files with 24 additions and 38 deletions
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15
shared/runtime/mpirq.c
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@@ -69,6 +69,15 @@ int mp_irq_dispatch(mp_obj_t handler, mp_obj_t parent, bool ishard) {
int result = 0;
if (handler != mp_const_none) {
if (ishard) {
#if MICROPY_STACK_CHECK && MICROPY_STACK_SIZE_HARD_IRQ > 0
// This callback executes in an ISR context so the stack-limit
// check must be changed to use the ISR stack for the duration
// of this function.
char *orig_stack_top = MP_STATE_THREAD(stack_top);
size_t orig_stack_limit = MP_STATE_THREAD(stack_limit);
mp_cstack_init_with_sp_here(MICROPY_STACK_SIZE_HARD_IRQ);
#endif
// When executing code within a handler we must lock the scheduler to
// prevent any scheduled callbacks from running, and lock the GC to
// prevent any memory allocations.
@@ -85,6 +94,12 @@ int mp_irq_dispatch(mp_obj_t handler, mp_obj_t parent, bool ishard) {
}
gc_unlock();
mp_sched_unlock();
#if MICROPY_STACK_CHECK && MICROPY_STACK_SIZE_HARD_IRQ > 0
// Restore original stack-limit checking values.
MP_STATE_THREAD(stack_top) = orig_stack_top;
MP_STATE_THREAD(stack_limit) = orig_stack_limit;
#endif
} else {
// Schedule call to user function
mp_sched_schedule(handler, parent);