Valid input:
  Help:
    ?      - show this help
    ?[cmd] - show help for a command

  Commands:
    .set      - change value of register
    .read     - read from memory
    .write    - write hex to memory
    .writestr - write string to memory
    .alloc    - allocate memory
    .regs     - show the contents of the registers
    .show     - toggle shown register types

Any other input will be interpreted as x86_64 assembly

Usage: .set register value
Changes the value of a register

  register - register name (GPR, FPR or status)
  value    - hex if GPR or FPR, 0 or 1 if status

Usage: .read address [len]
Displays a hexdump of memory starting at address

  address - an integer or a register name
  len     - the amount of bytes to read

Usage: .write address hexpairs
Writes hexpairs to a destination address

  address  - an integer or a register name
  hexpairs - pairs of hexadecimal numbers

Usage: .writestr address string
Writes an ascii string to a destination address

  address - an integer or a register name
  string  - an ascii string

Usage: .alloc len
Allocates some memory and returns the address

  len - the amount of bytes to allocate

Usage: .regs
Displays the values of the registers currently toggled on

Usage: .show [gpr|status|fpr_hex|fpr_double]
Toggles which types of registers are shown

  gpr        - General purpose registers (rax, rsp, rip, ...)
  status     - Status registers (CF, ZF, ...)
  fpr_hex    - Floating point registers shown in hex (xmm0, xmm1, ...)
  fpr_double - Floating point registers shown as doubles