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objdump.md

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objdump is a powerful command-line utility that comes with the GNU Binutils suite. It is used for displaying information about object files, executable files, and shared libraries. objdump can provide a wide range of details about the binary file, including disassembled machine code, header information, symbol tables, and more.

Here are some common uses of objdump:

  1. Disassemble Executable:

    objdump -d <executable>

    This command disassembles the machine code of the specified executable file, showing the assembly instructions.

  2. Display Sections:

    objdump -h <executable>

    This command displays information about the sections in the specified executable, including their sizes, offsets, and attributes.

  3. Print Symbol Table:

    objdump -t <executable>

    This command prints the symbol table of the executable, showing the addresses and names of symbols.

  4. Display Dynamic Sections:

    objdump -x <executable>

    This command displays the dynamic sections of the executable, providing information about shared library dependencies and other runtime details.

  5. Print Relocation Entries:

    objdump -r <executable>

    This command prints the relocation entries in the executable, showing how addresses are adjusted during linking.

  6. Display Header Information:

    objdump -f <executable>

    This command displays the file header information, including the architecture, entry point, and other details.

  7. Disassemble a Specific Section:

    objdump -d --section=.text <executable>

    This command disassembles a specific section of the executable, such as the ".text" section.

  8. Display Source Code alongside Assembly:

    objdump -S <executable>

    This command displays the source code interleaved with the assembly code, if the executable contains debug information.

objdump is a versatile tool commonly used for reverse engineering, debugging, and analyzing binary files. It provides a wealth of information about the structure and content of executable files, making it a valuable resource for understanding the internals of compiled programs.