1 files changed, 57 insertions, 0 deletions
diff --git a/py/cstack.c b/py/cstack.c
new file mode 100644
index 0000000000..fe4b16d652
--- /dev/null
+++ b/py/cstack.c
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Paul Sokolovsky
+ * Copryight (c) 2024 Angus Gratton
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/runtime.h"
+#include "py/cstack.h"
+
+void mp_cstack_init_with_sp_here(size_t stack_size) {
+    #if __GNUC__ >= 13
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic ignored "-Wdangling-pointer"
+    #endif
+    volatile int stack_dummy;
+    mp_cstack_init_with_top((void *)&stack_dummy, stack_size);
+    #if __GNUC__ >= 13
+    #pragma GCC diagnostic pop
+    #endif
+}
+
+mp_uint_t mp_cstack_usage(void) {
+    // Assumes descending stack
+    volatile int stack_dummy;
+    return MP_STATE_THREAD(stack_top) - (char *)&stack_dummy;
+}
+
+#if MICROPY_STACK_CHECK
+
+void mp_cstack_check(void) {
+    if (mp_cstack_usage() >= MP_STATE_THREAD(stack_limit)) {
+        mp_raise_recursion_depth();
+    }
+}
+
+#endif // MICROPY_STACK_CHECK