nlr: Add implementation using setjmp/longjmp.

Having an optimized asm implementation is good, but if we want portability,
that's it.

1 files changed, 16 insertions, 0 deletions

diff --git a/py/nlrsetjmp.c b/py/nlrsetjmp.c
new file mode 100644
index 000000000..a97c8634b
--- /dev/null
+++ b/py/nlrsetjmp.c
@@ -0,0 +1,16 @@
+#include <setjmp.h>
+#include <stdio.h>
+#include "nlr.h"
+
+#if MICROPY_NLR_SETJMP
+
+nlr_buf_t *nlr_setjmp_top;
+
+void nlr_setjmp_jump(void *val) {
+    nlr_buf_t *buf = nlr_setjmp_top;
+    nlr_setjmp_top = buf->prev;
+    buf->ret_val = val;
+    longjmp(buf->jmpbuf, 1);
+}
+
+#endif