objdump

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

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.

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]} otool and nm perform analogous functions for Mach-O files.^[1]^[2]

Example

For example,

$ objdump -D -M intel file.bin

This disassembles the file file.bin, showing its assembly code in Intel syntax.

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