From 3c658a4e755a75e495303957208486e583ddb270 Mon Sep 17 00:00:00 2001
From: Damien George
Date: Sun, 24 Aug 2014 16:28:17 +0100
Subject: py: Fix bug where GC collected native/viper/asm function data.

Because (for Thumb) a function pointer has the LSB set, pointers to
dynamic functions in RAM (eg native, viper or asm functions) were not
being traced by the GC.  This patch is a comprehensive fix for this.

Addresses issue #820.
---
 py/mpconfig.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'py/mpconfig.h')

diff --git a/py/mpconfig.h b/py/mpconfig.h
index 850d05524..73c015a09 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -429,6 +429,12 @@ typedef double mp_float_t;
 #define MP_ENDIANNESS_LITTLE (0)
 #endif
 
+// Make a pointer to RAM callable (eg set lower bit for Thumb code)
+// (This scheme won't work if we want to mix Thumb and normal ARM code.)
+#ifndef MICROPY_MAKE_POINTER_CALLABLE
+#define MICROPY_MAKE_POINTER_CALLABLE(p) (p)
+#endif
+
 // printf format spec to use for mp_int_t and friends
 #ifndef INT_FMT
 #ifdef __LP64__
-- 
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