DO NOT MERGE: Experiments with instruction encoding extraction #15
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The tools in this directory product JSON files describing instruction encodings based on the binutils overlay file xtensa-modules.c. The input format accepted is a .tar.gz or .tar.bz2 overlay tarball as accepted by a crosstools-ng build. Just run "make" in this directory to produce a JSON file for each machine description. (It takes surprisingly long to compile these files, so feel free to build in parallel to speed the process!). Signed-off-by: Andy Ross <[email protected]>
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Indeed, this is going to take a few passes to get right and Maciej (I couldn't find his github handle, though I've pointed him and @cujomalainey here) will need to figure out how to apply this and what needs to change. Really this was a weekend hack to see what could be recovered (turns out... almost everything I think, it wasn't so much difficult as it was obtuse). |
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Wow this is awesome, if Maciej gives this the thumbs up we can stop banging our heads on license headers. |
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@andyross can you convert this to a WIP so it doesn't get merged? |
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@andyross also thinking would this go in Zephyr SDK directly or does Zephyr SDK clone this repo as part of SDK build ? |
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Nothing this generates is going to be useful except to produce a toolchain. So somewhere along the path to a HiFi-enabled SDK toolchain is where this wants to live, but I'm no llvm expert (nor gcc for that matter, nor SDK build/CI person). I submitted it here just to have somewhere to discuss it and because this is the best single source for overlay files (Zephyr's SDK lacks the Mediatek and AMD files still). |
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@andyross this should probably upstream with Maciej's work in LLVM after the xtensa core is merged, but it can be carried here until that time. |
Not for merge yet, but all the data these scripts operate on is here, so it's a logical place to put it for now.
Fundamentally this is a data extraction project to recover a first-principles description of the Xtensa instruction formats from the executable C code in their existing overlay files.