Working with registers

The register command is used to read, write, or inspect the registers of a debugged program (with x86_64 register support).

Available Commands:

• register read <reg_name> - displays the value of a register (use lowercase x86_64 register names)
• register write <reg_name> <value> - modifies a register's value
• register info - lists all registers and their current values

Usage example

Consider this Rust program:

fn print_val(val: u32) {
    println!("val is {val}");
}

fn main() {
    let mut some_val = 3;
    some_val += 1;

    print_val(some_val);
}

Goal: Instead of printing 4, we'll manipulate a register to force the output 6.

Let’s do it: