Things to do:

• core/basic opcodes implementation;
  • [+] and/or/xor/neg/abs;
  • [+] shifts;
  • [+] add[x*]/sub[x*]/add.n/addi.n;
  • [+] call0, callx0, j, b*;
  • [+] l32*, s32*;
  • [+] windowed registers, call*/callx*, retw, rotw, rfwo, rfwu;
  • [-] boolean registers/commands;
• windowed registers;
  • [+] simple overflow algorithm that's triggered from ENTER;
• loop option;
• floating point;
• MMU;
  • [+] no-mmu mode;
• gdbserver;
  • [+] xml register map, read/write register;
  • [+] debug exception, single step mode;
  • [-] hw/sw breakpoints;
  • [+] wrong disassembly (caused by wrong endianness of produced ELFs);
• exceptions;
  • [+] debug;
  • [+] window overflow/underflow;
  • [-] invalid instruction;
• sample evaluation board;
  • [+] memory mapping, ELF loader;
  • [-] standard periferals;
• external configuration (a-la xtensa overlay)?