The given code is assembly language, and here's what it...

July 2, 2025 at 03:54 PM

mov rax,84 test ebx,ebx int 3

The given code is assembly language, and here's what it does, step-by-step:

  1. mov rax, 84:

    • This instruction moves the value 84 (in decimal) into the rax register, which is a general-purpose 64-bit register in x86-64 processors.
    • After this operation, the rax register will contain the value 84.
  2. test ebx, ebx:

    • This instruction performs a bitwise AND operation between the ebx register (the lower 32 bits of rbx) and itself (ebx).
    • The result isn't stored anywhere, but the CPU's flags (such as Zero Flag) will be updated based on the result:
      • If ebx is 0, the Zero Flag (ZF) will be set (indicating the result is zero).
      • If ebx is non-zero, the Zero Flag will be cleared.
  3. int 3:

    • This is a software interrupt used for triggering a breakpoint in debugging.
    • When this instruction executes, it typically signals a debugger (if one is present) to pause the program's execution. If no debugger is attached, the program will crash and terminate.

Summary

This code sets rax to 84, performs a test on the ebx register to set CPU flags based on its value, and then triggers a breakpoint interrupt (int 3). If you're debugging, execution will likely halt at the int 3 breakpoint.

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