http://www.gnu.org/manual/
http://www.gnu.org/software/gdb/documentation/
http://sourceware.org/gdb/current/onlinedocs/gdb/
http://blog.****.net/haoel/article/details/2879
b main //berak point
b Invoke_SO //调用so 动态库
n //next
是否进入动态库//y
额，大部分，最方便还是写log