objdump

objdump is a command-line program for displaying various information about object files on Unix-like operating systems. For instance, it can be used as a disassembler to view an executable in assembly form. It is part of the GNU Binutils for fine-grained control over executables and other binary data. objdump uses the BFD library to read the contents of object files. Similar utilities are Borland TDUMP, Microsoft DUMPBIN and readelf.

objdump

Operating system	Unix and Unix-like
Type	Command
License	GNU GPL

Note that on certain platforms (e.g. macOS), the objdump binary may actually be a link to llvm's objdump, with different command-line options and behavior.^{[citation needed]}

Example

For example,

$ objdump -D -M intel file.bin | grep main.: -A20 

This performs disassembly on the file «file.bin», with the assembly code shown in Intel syntax. We then redirect it to grep, which searches the main function and displays 20 lines of its code.

Example output:

 4004ed<main>:  4004ed:55   push rbp  4004ee:48 89 e5  mov rbp,rsp  4004f1:c7 45 ec 00 00 00 00 mov DWORD PTR [rbp-0x14],0x0  4004f8:c7 45 f0 01 00 00 00 mov DWORD PTR [rbp-0x10],0x1  4004ff:c7 45 f4 02 00 00 00 mov DWORD PTR [rbp-0xc],0x2  400506:c7 45 f8 03 00 00 00 mov DWORD PTR [rbp-0x8],0x3  40050d:c7 45 fc 04 00 00 00 mov DWORD PTR [rbp-0x4],0x4  400514:c7 45 ec 00 00 00 00 mov DWORD PTR [rbp-0x14],0x0  40051b:eb 13   jmp 400530 <main+0x43>  40051d:8b 05 15 0b 20 00  mov eax,DWORD PTR [rip+0x200b15] # 601038 <globalA>  400523:83 e8 01  sub eax,0x1  400526:89 05 0c 0b 20 00  mov DWORD PTR [rip+0x200b0c],eax # 601038 <globalA>  40052c:83 45 ec 01  add DWORD PTR [rbp-0x14],0x1  400530:8b 05 02 0b 20 00  mov eax,DWORD PTR [rip+0x200b02] # 601038 <globalA>  400536:39 45 ec  cmp DWORD PTR [rbp-0x14],eax  400539:7c e2   jl 40051d <main+0x30>  40053b:5d   pop rbp  40053c:c3   ret   40053d:0f 1f 00  nop DWORD PTR [rax] 

See also

•  Computer programming portal

• GNU Binutils

References

External links

• objdump(1) – Linux User Commands Manual
• readelf(1) – Linux User Commands Manual
• Binutils::Objdump - Perl interface to objdump