This program is able to interpret most ARM Cortex-M0 instructions. It takes a binary as input and executes it. It currently only supports the NRF51822 (flash, memory map, UART peripheral).

While most of it works, some emulation does not. This is a work-in-progress, and I won't promise I'll ever finish it.

It is able to run MicroPython (or more specifically, the nRF port) with all tests passing for the PCA10028 board so it is probably able to run most applications that don't use any peripherals or interrupts.

Currently supported:

• Most of the Cortex-M0 instruction set.
• A basic implementation of the UART0 and NVIC peripheral for Nordic devices.
• GDB remote support (connect gdb with target remote :7333).

Not supported:

• Interrupt handling (except Reset_Handler, of course).
• The WFI and WFE instructions.

This emulator has two variants of the CLI tool:

• C: A (hopefully) portable implementation of the emulator, with bare bones image loading support and nothing else.

  Usage:

  make
  ./emculator <imagepath>
  

• Go: An emulator that uses the library written in C and provides some extra tooling around it, like GDB remote support.

  Usage:

  go install github.com/aykevl/emculator
  emculator <imagepath>
  

Note that you must provide raw image files (.bin), not .hex or .elf files. Those are not (yet) supported.