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whitequark's profile
whitequark
whitequark
whitequark
@whitequark

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whitequark

@whitequark

http://whitequark.org  · http://llvm.moe  · http://powerlinesinanime.tumblr.com  · working on quantum computers for a living · DMs open · she

Joined July 2010

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    1. whitequark‏ @whitequark Sep 19

      OH: "you could use COFF for inputs to the linker, and ELF for the linked binary"

      7 replies 1 retweet 22 likes
    2. reabstraction thunk golem‏ @jckarter Sep 19
      Replying to @whitequark

      Maybe the other way around, ELF is nice and flexible as a .o format but has way too many bells and whistles as an image format

      1 reply 0 retweets 0 likes
    3. whitequark‏ @whitequark Sep 19
      Replying to @jckarter

      I wrote a few ELF loaders and I'm not sure I agree.

      1 reply 0 retweets 0 likes
    4. reabstraction thunk golem‏ @jckarter Sep 19
      Replying to @whitequark

      I guess static ELF isn't too bad, but shared images leave too much relocatable at load time IMO and have weird things like "copy exactly this many bytes into the executable"

      2 replies 0 retweets 0 likes
      whitequark‏ @whitequark Sep 19
      Replying to @jckarter

      hmm, I wrote a (restricted) .so loader as well, can you elaborate?

      4:06 PM - 19 Sep 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. reabstraction thunk golem‏ @jckarter Sep 19
          Replying to @whitequark

          Like, the standard thing when your executable is non-PIE and it references a data symbol from a .so is to COPY the data to a fixed address in the executable and relocate the symbol in the .so, instead of going through the GOT/import table like you typically would on mac/windows

          1 reply 0 retweets 0 likes
        3. reabstraction thunk golem‏ @jckarter Sep 19
          Replying to @jckarter @whitequark

          which dirties a bunch of memory, penalizes the code in the .so that has to indirectly reference even its own symbols, and hardcodes the size of objects in the .so

          1 reply 0 retweets 0 likes
        4. whitequark‏ @whitequark Sep 19
          Replying to @jckarter

          oh wtf this is wrong my loader was accessible exclusively via dlopen() so i didn't hit that

          1 reply 0 retweets 0 likes
        5. Brendan G Bohannon‏ @cr88192 Sep 19
          Replying to @whitequark @jckarter

          My case, when I was looking at the specs, I saw enough "weird stuff" with ELF SO loading that I mostly stuck with PE/COFF for my uses. PE is kind of an ugly format, but its handling of dynamic linking is straightforward. Granted, static-linked ELF is fairly straightforward.

          0 replies 0 retweets 1 like
        6. End of conversation

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