Tons of fixes to the backtracker code, and also added an extra backtracker that does not require unwind tables to work and it is used if unwind tables are absent

Marlin/src/HAL/HAL_DUE/backtrace/unwarmmem.h

@@ -0,0 +1,33 @@
+/***************************************************************************
+ * ARM Stack Unwinder, Michael.McTernan.2001@cs.bris.ac.uk
+ * Updated, adapted and several bug fixes on 2018 by Eduardo José Tagle
+ *
+ * This program is PUBLIC DOMAIN.
+ * This means that there is no copyright and anyone is able to take a copy
+ * for free and use it as they wish, with or without modifications, and in
+ * any context, commerically or otherwise. The only limitation is that I
+ * don't guarantee that the software is fit for any purpose or accept any
+ * liablity for it's use or misuse - this software is without warranty.
+ ***************************************************************************
+ * File Description: Interface to the memory tracking sub-system.
+ **************************************************************************/
+
+#ifndef UNWARMMEM_H
+#define UNWARMMEM_H
+
+#include "unwarm.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool UnwMemHashRead(MemData * const memData, uint32_t addr, uint32_t * const data, bool * const tracked);
+bool UnwMemHashWrite(MemData * const memData, uint32_t addr, uint32_t val, bool valValid);
+void UnwMemHashGC(UnwState * const state);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+