How can I use objdump to disassemble a binary executable and get the assembly code in Linux?

Disassembling a Binary Executable in Linux to Obtain Assembly Code

To disassemble a binary executable and extract its assembly code, we can employ a disassembler.

Using objdump

One of the most commonly used disassemblers in Linux is objdump, a part of the GNU development tools. Objdump provides a straightforward command for this purpose:

$ objdump -d /path/to/binary

where /path/to/binary represents the location of the binary you want to disassemble.

Once you run this command, objdump will display the disassembled assembly code in a readable format. Here's an example output:

080483b4 <main>:
 80483b4:   8d 4c 24 04             lea    0x4(%esp),%ecx
 80483b8:   83 e4 f0                and    xfffffff0,%esp
 80483bb:   ff 71 fc                pushl  -0x4(%ecx)
 80483be:   55                      push   %ebp
 80483bf:   89 e5                   mov    %esp,%ebp
 80483c1:   51                      push   %ecx
 80483c2:   b8 00 00 00 00          mov    x0,%eax
 80483c7:   59                      pop    %ecx
 80483c8:   5d                      pop    %ebp
 80483c9:   8d 61 fc                lea    -0x4(%ecx),%esp
 80483cc:   c3                      ret    
 80483cd:   90                      nop
 80483ce:   90                      nop
 80483cf:   90                      nop

This output provides a detailed assembly code representation of the binary, including instructions, memory addresses, and register usage.

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