arm: Validate memory before access
arm: Validate memory before access

Prevent SIGSEGV due to accessing addresses now mapped to current process

Signed-off-by: Vyacheslav Barinov <6fc14e856a1fa0119bdc7f645d3dbfdcded8db65@samsung.com>

libunwind/libunwind,unkadoug/libunwind,wdv4758h/libunwind,vegard/libunwind,dagar/libunwind,vegard/libunwind,djwatson/libunwind,evaautomation/libunwind,krytarowski/libunwind,tony/libunwind,bo-on-software/libunwind,joyent/libunwind,frida/libunwind,rantala/libunwind,unkadoug/libunwind,yuyichao/libunwind,vtjnash/libunwind,bo-on-software/libunwind,libunwind/libunwind,wdv4758h/libunwind,wdv4758h/libunwind,djwatson/libunwind,vtjnash/libunwind,pathscale/libunwind,igprof/libunwind,igprof/libunwind,dagar/libunwind,frida/libunwind,rantala/libunwind,joyent/libunwind,tkelman/libunwind,rantala/libunwind,frida/libunwind,vegard/libunwind,krytarowski/libunwind,tony/libunwind,dagar/libunwind,unkadoug/libunwind,djwatson/libunwind,tony/libunwind,joyent/libunwind,krytarowski/libunwind,tkelman/libunwind,libunwind/libunwind,igprof/libunwind,pathscale/libunwind,evaautomation/libunwind,pathscale/libunwind,evaautomation/libunwind,yuyichao/libunwind,vtjnash/libunwind,yuyichao/libunwind,tkelman/libunwind,bo-on-software/libunwind