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embed: Improve stack top estimation.

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Obtaining the stack-top via a few function calls may yield a pointer which
is too deep within the stack.  So require the user to obtain it from a
higher level (or via some other means).

Fixes issue #11781.

Signed-off-by: YAMAMOTO Takashi <yamamoto@midokura.com>
This commit is contained in:
YAMAMOTO Takashi
2024-02-09 14:03:00 +09:00
committed by Damien George
parent be8d660fc2
commit d2a3cd7ac4
3 changed files with 11 additions and 4 deletions
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9
examples/embedding/main.c
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@@ -31,7 +31,14 @@ static char heap[8 * 1024];
int main() {
// Initialise MicroPython.
mp_embed_init(&heap[0], sizeof(heap));
//
// Note: &stack_top below should be good enough for many cases.
// However, depending on environment, there might be more appropriate
// ways to get the stack top value.
// eg. pthread_get_stackaddr_np, pthread_getattr_np,
// __builtin_frame_address/__builtin_stack_address, etc.
int stack_top;
mp_embed_init(&heap[0], sizeof(heap), &stack_top);
// Run the example scripts (they will be compiled first).
mp_embed_exec_str(example_1);