I'm new to binary analysis. I am trying to analyse a simple program I compiled from my C code via gcc.
I followed these steps:
1. aaa
2. afl
and I got this output:
0x00000608 3 23 sym._init
0x00000630 1 8 sym.imp.puts
0x00000638 1 8 sym.imp._IO_getc
0x00000640 1 8 sym.imp.__printf_chk
0x00000648 1 8 sym.imp.__cxa_finalize
0x00000650 4 77 sym.main
0x000006a0 1 43 entry0
0x000006d0 4 50 -> 44 sym.deregister_tm_clones
0x00000710 4 66 -> 57 sym.register_tm_clones
0x00000760 5 50 sym.__do_global_dtors_aux
0x000007a0 4 48 -> 42 sym.frame_dummy
0x000007d0 1 24 sym.smth
0x000007f0 4 101 sym.__libc_csu_init
0x00000860 1 2 sym.__libc_csu_fini
0x00000864 1 9 sym._fini
I can get main is the main starting point of the program but I'm worried about what entry0 is. Apparently from what I saw is not a symbol. I tried to run ag @ entry0 and ag @ main and the graphs I saw were very different. By looking at the disassembled code I see this for entry0:
I'm supposing this might be a kind of ELF template function to load the binary and run it from main. What is entry0 really?
Sorry for keeping it so long. Thanks in advance.