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esp32s2: Correct port_stack_get_top()

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Closes #3649
This commit is contained in:
Jeff Epler 2020-11-10 10:41:10 -06:00
parent 9765b2c237
commit 2d8ebfcf63
1 changed files with 12 additions and 1 deletions
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13
ports/esp32s2/supervisor/port.c
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@ -148,7 +148,18 @@ uint32_t *port_stack_get_limit(void) {
} }
uint32_t *port_stack_get_top(void) { uint32_t *port_stack_get_top(void) {
return port_stack_get_limit() + CONFIG_ESP_MAIN_TASK_STACK_SIZE / (sizeof(uint32_t) / sizeof(StackType_t)); // The sizeof-arithmetic is so that the pointer arithmetic is done on units
// of uint32_t instead of units of StackType_t. StackType_t is an alias
// for a byte sized type.
//
// The main stack is bigger than CONFIG_ESP_MAIN_TASK_STACK_SIZE -- an
// "extra" size is added to it (TASK_EXTRA_STACK_SIZE). This total size is
// available as ESP_TASK_MAIN_STACK. Presumably TASK_EXTRA_STACK_SIZE is
// additional stack that can be used by the esp-idf runtime. But what's
// important for us is that some very outermost stack frames, such as
// pyexec_friendly_repl, could lie inside the "extra" area and be invisible
// to the garbage collector.
return port_stack_get_limit() + ESP_TASK_MAIN_STACK / (sizeof(uint32_t) / sizeof(StackType_t));
} }
supervisor_allocation _fixed_stack; supervisor_allocation _fixed_stack;