How find find offset of a function using gdb?

Question

I have a shared object file that has DWARF info. I want to find the offset of a function. My stack trace is in the format mangledFuncName + 0x123. I want to find the line of code for the corresponding frame. Ideally I'd like to build some sort of mapping between all offsets of a .so file and the filename/linenumber for the offset/range of offsets. Is this possible to do with gdb?

Answer 1

gdb <so or file loading so>
(gdb) b main
(gdb) run
(gdb) p youfun
(gdb) info line *(0xabcdef+0xab)
(gdb) list *(0xabcdef+0xab)
(gdb) info symbol 0xabcdef
(gdb) b *(0xabcdef+0xab)

• line 2 and 3 are there to make the .so file load. It is not needed if you have the debug info loaded already (file or as gdb argument).
• line 4 will show the address of the function
• replace 0xabcdef with the address of the function and 0xab with the offset