Cortex-M / Thumb

[larsbrinkhoff]

The next target ought to be Cortex-M devices, aka the Thumb instruction set. (At this point, I don't need Thumb2 instructions.)

I wonder if there's a faithful simulator for e.g. Cortex-M0?

[larsbrinkhoff]

This modified QEMU seems promising: https://github.com/sushihangover/qemu

Hey @sushihangover!

[larsbrinkhoff]

It's not hard to find an M0 development board, but I'd like one with just 4K flash.

[larsbrinkhoff]

Another QEMU modified for the STM32F1 series. That's Cortex-M3, but close enough? https://github.com/beckus/qemu_stm32

Hey @beckus!

[larsbrinkhoff]

According to ARM documentation, the Cortex-M0 implements the ARMv6-M instuction set which comprises:

• All of the Thumb-1 instructions from ARMv7-M, excluding CBZ, CBNZ and IT.
• The Thumb-2 instructions BL, DMB, DSB, ISB, MRS and MSR.

[larsbrinkhoff]

A third fork of QEMU:
https://github.com/gnu-mcu-eclipse/qemu