From 1d5d4f49d9bf7dd4930a2b00a0ce2ee7ffbbd604 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Sat, 13 Feb 2016 15:43:28 +0200
Subject: [PATCH] py/stackctrl: Add mp_stack_set_top() to explicitly set stack
 top value.

Useful for embedded targets with fixed stack layout.
---
 py/stackctrl.c | 4 ++++
 py/stackctrl.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/py/stackctrl.c b/py/stackctrl.c
index 4c51653727..14d1fd0429 100644
--- a/py/stackctrl.c
+++ b/py/stackctrl.c
@@ -35,6 +35,10 @@ void mp_stack_ctrl_init(void) {
     MP_STATE_VM(stack_top) = (char*)&stack_dummy;
 }
 
+void mp_stack_set_top(void *top) {
+    MP_STATE_VM(stack_top) = top;
+}
+
 mp_uint_t mp_stack_usage(void) {
     // Assumes descending stack
     volatile int stack_dummy;
diff --git a/py/stackctrl.h b/py/stackctrl.h
index bd18f21426..e915f5000f 100644
--- a/py/stackctrl.h
+++ b/py/stackctrl.h
@@ -29,6 +29,7 @@
 #include "py/mpconfig.h"
 
 void mp_stack_ctrl_init(void);
+void mp_stack_set_top(void *top);
 mp_uint_t mp_stack_usage(void);
 
 #if MICROPY_STACK_CHECK