dwarfRegisterBytes

    pub fn dwarfRegisterBytes(ctx: *Alpha, register_num: u16) DwarfRegisterError![]u8 {
        switch (register_num) {
            0...31 => return @ptrCast(&ctx.r[register_num]),
            64 => return @ptrCast(&ctx.pc),

            32...63 => return error.UnsupportedRegister, // f0 - f31
            66 => return error.UnsupportedRegister, // uniq

            else => return error.InvalidRegister,
        }
    }