Overview
objdump extracts information from various object file formats like ELF, COFF, and a.out, presenting it in a human-readable form. It is primarily used for debugging, reverse engineering, and binary analysis, and is part of the GNU Binutils package.
Key Features
- Disassembly of assembly code
- Display of file header information
- Display of section header information
- Inspection of symbol tables
- Examination of dynamic relocation information
Key Options
objdump provides a variety of options to analyze specific parts of binary files or control the output format.
Information Display
Output Format
Generated command:
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Description:
`objdump` Executes the command.
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Usage Examples
Demonstrates how to extract various information from binary files using objdump.
Disassemble Executable File
objdump -d /bin/lsDisplays the assembly code of the /bin/ls executable file.
View All Header Information
objdump -x /bin/lsDisplays detailed information for all headers of the /bin/ls file.
View Symbol Table
objdump -t /bin/lsDisplays a list of symbols (functions, variables, etc.) defined in the /bin/ls file.
Disassemble with Intel Syntax
objdump -M intel -d /bin/lsDisplays the assembly code of the /bin/ls file using Intel syntax.
View Section Headers of a Library File
objdump -h /lib/x86_64-linux-gnu/libc.so.6Displays the section header information for a shared library file.
Tips & Notes
objdump is a powerful binary analysis tool, but its output requires a basic understanding of assembly language and binary file structures.
Usage Tips
- It is useful to combine objdump with `grep`, for example: `objdump -d <file> | grep -A 20 <function_name>` to analyze specific functions.
- It can also be used to analyze object files within shared library files (.so) or static library files (.a).
- It is a key tool in various fields such as security vulnerability analysis, malware analysis, and system programming debugging.
Notes
objdump is a safe tool that only reads information from binary files without modifying them. However, the amount of output can be large, so it is important to use the necessary options precisely to extract only the desired information.