Also fix a wrong format specifier for an unsigned variable.
Detected by cppcheck, patch submitted upstream.
Change-Id: I9b84d91eeb242ed77b53ecc16252c5b35190bb9f
Simplified stack unwinder for ARM. This is port of
http://www.mcternan.me.uk/ArmStackUnwinding/
backtrace() is called from UIE() on native targets
and from panicf() on both native and ARM RaaA.
Change-Id: I8e4b3c02490dd60b30aa372fe842d193b8929ce0
