[snops]

The command line interface eCos has to call any C function sounds interesting, I wonder if there is a standalone library to do this on other platforms.

To further boost performance, it might be worth skipping past interrupts and going straight for DMA, as the CPU probably doesn't need to be doing anything. I imagine figuring out how that works on an undocumented chip would be quite tricky though.

[grishka]

> I wonder if there is a standalone library to do this on other platforms.

There's a thing called Cycript for jailbroken iOS that, among other features, allows you to attach to any process and then gives you what's basically a command line interface to the objective-c runtime. It's a godsend for reversing iOS apps.

It should also be trivial to implement a similar tool for Android using Xposed framework.