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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 17 Nov 2020
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      Also, everyone please stop eating up Apple's marketing bullshit and calling Rosetta 2 an "Ahead-of-Time Translator, Not An Emulator" as if it is some Fundamental Difference that Makes It Fast. It's a JIT emulator, with a cache, with opportunistic partial ahead of time warming.

      7 replies 48 retweets 244 likes
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    2. Hector Martin‏ @marcan42 17 Nov 2020
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      Converting x86 apps to ARM statically is not a thing, and will *never* be a thing, because that would break mathematically proven theorems about computer science (beyond obvious cheats like just embedding the emulator into the "converted" app).

      3 replies 3 retweets 55 likes
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    3. Hector Martin‏ @marcan42 17 Nov 2020
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      You *always* need to JIT, you *always* need an escape hatch no matter how much work you try to do ahead of time, and you *cannot* statically infer all the information required for full static translation in all but the simplest cases.

      2 replies 0 retweets 47 likes
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    4. endrift  🏳️‍⚧️‏ @endrift 17 Nov 2020
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      Replying to @marcan42

      Wouldn't that depends on how the instruction set is defined? I'm pretty sure JVM AOTs exist. But so long as you have indirect branches that can go to things other than well-defined function starts, and only return to well-defined return points, well, good luck AOTing ROP :P

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 17 Nov 2020
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      Replying to @endrift

      Yes, *if* the thing you're translating has been specifically designed with constraints and metadata to make it possible, then you can do it. That's, after all, what LLVM bitcode is. Also maybe you can truly AoT NaCL x86 binaries? Just a guess, that would be interesting.

      2 replies 0 retweets 0 likes
    6. endrift  🏳️‍⚧️‏ @endrift 17 Nov 2020
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      Replying to @marcan42

      I think that's what pNaCl is (was) for. But yeah, x86 is definitely NOT something defined with translation in mind.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 17 Nov 2020
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      Replying to @endrift

      pNaCl is the portable version, but x86 NaCl is "verified" like Java is, which means you know all basic block entries I believe, with restrictions on indirect branching, so maaaaybe you can make it work?

      11:12 PM - 17 Nov 2020
      1 reply 0 retweets 0 likes
        1. endrift  🏳️‍⚧️‏ @endrift 17 Nov 2020
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          Replying to @marcan42

          Oh, you mean maybe it'd work for x86 NaCl *too*, not just pNaCl. Come to think of it I think pNaCl binaries are LLVM bitcode anyway.

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