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I ran objdump -r on an object file and got the following output. What do each of the columns represent here? I might have missed it, but the documentation doesn't specify.
simple.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <main>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 48 83 ec 30 sub $0x30,%rsp
8: 64 48 8b 04 25 28 00 mov %fs:0x28,%rax
f: 00 00
11: 48 89 45 f8 mov %rax,-0x8(%rbp)
15: 31 c0 xor %eax,%eax
17: c7 45 d8 00 00 00 00 movl $0x0,-0x28(%rbp)
1e: eb 64 jmp 84 <main+0x84>
20: 8b 45 d8 mov -0x28(%rbp),%eax
23: 89 c7 mov %eax,%edi
25: e8 00 00 00 00 callq 2a <main+0x2a>
26: R_X86_64_PC32 foo-0x4
2a: 89 45 dc mov %eax,-0x24(%rbp)
2d: 8b 55 dc mov -0x24(%rbp),%edx
30: 48 8d 45 e0 lea -0x20(%rbp),%rax
etc
538
objdump displays information about one or more object files. The options control what particular information to display. This information is mostly useful to programmers who are working on the compilation tools, as opposed to programmers who just want their program to compile and work.
Next is the section with which the symbol is associated or *ABS* if the section is absolute (ie not connected with any section), or *UND* if the section is referenced in the file being dumped, but not defined there.
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 displays information about one or more object files, either on their own, or inside libraries. It is commonly used as a disassembler, but it can also display information about file headers, symbol tables, relocations, debugging directives and more.
Isn't it self explanatory:
Offset, Machine code, Corresponding Assembly code
113
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