Add feature to exit with semihosting::process:abort()

[t-moe]

Useful to get defmt_test working on esp32 riscv. ( knurling-rs/defmt#796)

[bjoernQ]

Just a thought: could we avoid the additional dependency? It's just a glorified ebreak and we really just want one syscall 🤔

https://github.com/riscv-software-src/riscv-semihosting/blob/HEAD/riscv-semihosting-spec.adoc

However, that dependency isn't a show-stopper here - but I think it would be easy to avoid it. I can also imagine adding it now and replacing it later

[t-moe]

Just a thought: could we avoid the additional dependency? It's just a glorified ebreak and we really just want one syscall 🤔

I actually set the PR status back to draft, because I can also get defmt_test working without modifications on esp-backtrace and esp-println by using defmt-rtt and panic-probe. I'm still evaluating which road to pursue....

[bjoernQ]

I think when using RTT the better option is to use defmt-rtt / panic-probe 👍

[jessebraham]

I think when using RTT the better option is to use defmt-rtt / panic-probe 👍

I agree, however unfortunately panic-probe is currently ARM-specific, and needs updating to support our chips.

[t-moe]

unfortunately panic-probe is currently ARM-specific, and needs updating to support our chips.

True.

I'm working on that in knurling-rs/defmt#796 , but waiting on feedback for now.

[bjoernQ]

We probably can close this? Feel free to re-open as needed