What is undefined function when I use Ghidra to dissemble a .so file?
I am now trying to dissemble a .so file and I found a strange part :
And follow FUN_004d9f38 lead me to this :
Can any one help me understanding what is so called undefined __cdecl FUN_004d9f38(void), specifically what is a undefinde function.
As the code show above. the first picture's code use a jump instruction jump into FUN_004d9f38, but the FUN_004d9f38 is a invalid instruction code of 67. How can the program manage to still work properly ?
undefined is a special data type, that Ghidra uses to to mark locations where the type is not known/defined yet. If you right click the function name and Edit Function you should see a window like this that makes this clearer:
if you change the datatype in the list to e.g. qword you get qword FUN_1000081e0 instead of undefined FUN_1000081e0:
