The given code is assembly language, and here's what it...
July 2, 2025 at 03:54 PM
The given code is assembly language, and here's what it does, step-by-step:
-
mov rax, 84
:- This instruction moves the value
84
(in decimal) into therax
register, which is a general-purpose 64-bit register in x86-64 processors. - After this operation, the
rax
register will contain the value84
.
- This instruction moves the value
-
test ebx, ebx
:- This instruction performs a bitwise
AND
operation between theebx
register (the lower 32 bits ofrbx
) 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
is0
, the Zero Flag (ZF) will be set (indicating the result is zero). - If
ebx
is non-zero, the Zero Flag will be cleared.
- If
- This instruction performs a bitwise
-
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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