I searched through google several methods, but did not succeed.
one:
this add libubacktrace,but don not usefull.
two:
This method has a little help, but can not get the correct ra and sp pointer values， so the backtrace is short and the order is not right 。

os：openwrt 15.05
libc：uClibc
hardware: MT7688（MIPS Arch）