ChanServ changed the topic of #wayland to: https://wayland.freedesktop.org | Discussion about the Wayland protocol and its implementations, plus libinput | register your nick to speak
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<mjt>
ManMower: so, re the wlfreerdp issue yesterday: I was sure it was a weston problem. Turned out I were entirely wrong, it was freerdp's :)
<mjt>
I stand corrected
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<pq>
paulk, yes, I worked on mmio-trace over a decade ago, and haven't touched it since, so I might not be of much help. :-)
<pq>
paulk, yes, you got the basics of it right.
<pq>
paulk, set a MMIO page to fault; when it faults, decode the instruction to see what it does; set up single-stepping, mark the page present, and let the instruction complete; in single-step handler, reset everything to fault again.
<pq>
paulk, read instructions are recorded after the single-step, write instructions I don't remember.
<pq>
paulk, I recall that something about mmio-trace was extremely x86-specific. The instruction decoding is of course, but I forget if something else was too that would make implementing it on arm difficult.
<pq>
paulk, IIRC, "pre" and "post" handlers refers to before and after executing the instruction for real.
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<pq>
paulk, I recall I had a desire to replace single-stepping with software emulation of the instruction. It would have made it much less ugly, but also emulation wasn't much there at the time or something. I think the kernel nowadays has enough emulation services to support that? Not sure.
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<pq>
I forget what was the other sub-system that needed instruction emulation we could have borrowed.
<pq>
paulk, hmm, maybe emulation instead of single-stepping would avoid the need to shut down all CPU cores except one.
<pq>
could keep the MMIO page in faulting state all the time, and execute the emulation on a parallel mapping that works
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<paulk>
pq: thanks!
<paulk>
pq: right keeping a parallel mapping and doing the actual I/O with it sounds like it could work
<paulk>
anyway the part I'm mostly worried about is decoding the instruction -- I'll look if there's arm stuff for that already around
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<pq>
paulk, if that's the only issue, sounds relatively easy. :-)
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