readelf 대 objdump : 둘 다 필요한 이유는 무엇입니까

Question

내가 작업하고있는 프로젝트의 ELF 파일 레이아웃에 대해 알아야하고 이러한 도구가 있음을 눈치 챘습니다. 모든 Linux 배포판에 readelf 및 objdump가 모두 포함되어있는 이유는 무엇입니까? 이 도구들이 서로 보완합니까? 언제 다른 것을 사용하는 것을 선호합니까? 바이너리 유틸리티에서

Answer 1

/readelf.c :

/* The difference between readelf and objdump: 

    Both programs are capabale of displaying the contents of ELF format files, 
    so why does the binutils project have two file dumpers ? 

    The reason is that objdump sees an ELF file through a BFD filter of the 
    world; if BFD has a bug where, say, it disagrees about a machine constant 
    in e_flags, then the odds are good that it will remain internally 
    consistent. The linker sees it the BFD way, objdump sees it the BFD way, 
    GAS sees it the BFD way. There was need for a tool to go find out what 
    the file actually says. 

    This is why the readelf program does not link against the BFD library - it 
    exists as an independent program to help verify the correct working of BFD. 

    There is also the case that readelf can provide more information about an 
    ELF file than is provided by objdump. In particular it can display DWARF 
    debugging information which (at the moment) objdump cannot. */