dwarfRegisterBytes

    pub fn dwarfRegisterBytes(ctx: *X86_64, register_num: u16) DwarfRegisterError![]u8 {
        // System V Application Binary Interface AMD64 Architecture Processor Supplement
        //   § 3.6.2 "DWARF Register Number Mapping"
        switch (register_num) {
            // The order of `Gpr` intentionally matches DWARF's mappings.
            0...16 => return @ptrCast(&ctx.gprs.values[register_num]),

            17...32 => return error.UnsupportedRegister, // xmm0 - xmm15
            33...40 => return error.UnsupportedRegister, // st0 - st7
            41...48 => return error.UnsupportedRegister, // mm0 - mm7
            49 => return error.UnsupportedRegister, // rflags
            50...55 => return error.UnsupportedRegister, // es, cs, ss, ds, fs, gs
            58...59 => return error.UnsupportedRegister, // fs.base, gs.base
            62 => return error.UnsupportedRegister, // tr
            63 => return error.UnsupportedRegister, // ldtr
            64 => return error.UnsupportedRegister, // mxcsr
            65 => return error.UnsupportedRegister, // fcw
            66 => return error.UnsupportedRegister, // fsw
            67...82 => return error.UnsupportedRegister, // xmm16 - xmm31 (AVX-512)
            118...125 => return error.UnsupportedRegister, // k0 - k7 (AVX-512)
            130...145 => return error.UnsupportedRegister, // r16 - r31 (APX)

            else => return error.InvalidRegister,
        }
    }