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Vhex is a kernel which provide development and retro ingenierie platform for the Casio's OS
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README.md

Vhex disassembler

Vhex is a GUI, Vim based, disassembler for fx9860g. The Casio's OS code is not open-source but we can read the binary for understand his working. There are in particular the syscalls, OS's functions that can be called as a library since the add-ins, which are a gold mine of clues about the functioning of the material.

features

  • All SH3 instructions is traduced "on-the-fly".
  • Can handle 3 modes for movements.
  • Can handle commands.
  • Commands history.
  • Compatible with SH3 and SH4 architecture.

List of currently supported commands:

  • systab jump to the syscall entry (Casio do not use TRAPA instruction, just jump into constant address).
  • vbrjmp int jump to the Casio interrupt handler.
  • vbrjmp except jump to the Casio exception handler.
  • vbrjmp fault jump to the Casio memory fault handlers.
  • syscall <id> jump to the syscall function.
  • ram <zone> jump to the ram mapped in zone (p0,p1,p2,p3,p4).
  • jmp <address> jump to the address.
  • rom jump to the start of the ROM.

List of currently supported modes:

TODO WRITE DOC

  • UNUSED
  • NORMAL
  • COMMAND

Building

Before compiling for the first time, There are a few dependencies:

  • A suitable GCC toolchain in the PATH. You can absolutely not build Vhex with your system compiler!sh3eb-elf is strongly advised.
  • g1a wrapper to generate the Casio header.
  • P7 communication utilities.

To compile the project, you just plug the calculator and execute:

% make
% make install