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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Jonas Termansen‏ @sortiecat 28 Jul 2017
      Replying to @sortiecat

      That's not the case with many other standard libraries. Granted, only supporting static link for now does help.

      1 reply 0 retweets 0 likes
    2. Jonas Termansen‏ @sortiecat 28 Jul 2017
      Replying to @sortiecat

      On Linux, a static program has to open its own ELF executable to initialize thread local storage. On #Sortix, the kernel does that.

      1 reply 0 retweets 0 likes
    3.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 28 Jul 2017
      Replying to @sortiecat

      "has to open its' own ELF executable" hmm? Isn't the thread segment just loaded somewhere into memory to be copied by startup code?

      1 reply 0 retweets 1 like
    4. Jonas Termansen‏ @sortiecat 29 Jul 2017
      Replying to @erincandescent @oshepherd

      Hmm looks like you're right according to a quick strace. I am not sure where I got this idea then.

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 29 Jul 2017
      Replying to @sortiecat @oshepherd

      It has to process its own program headers to find the TLS image and copy it to main thread's TLS, but that doesn't involve file loading.

      2 replies 0 retweets 2 likes
    6. Jonas Termansen‏ @sortiecat 29 Jul 2017
      Replying to @RichFelker @oshepherd

      Aha - so the kernel loads the program headers for static programs? libc then iterates them and locates TLS?

      2 replies 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 29 Jul 2017
      Replying to @sortiecat @oshepherd

      The program headers are part of one of the PT_LOAD maps since they're needed at runtime for various reasons including TLS.

      2 replies 0 retweets 1 like
    8. Jonas Termansen‏ @sortiecat 29 Jul 2017
      Replying to @RichFelker @oshepherd

      How does the process locate the headers? What other reasons besides TLS?

      1 reply 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 29 Jul 2017
      Replying to @sortiecat @oshepherd

      Via auxv slot AT_PHDR. Dwarf unwinding/exception handling also needs program headers for .eh_frame.

      2 replies 0 retweets 0 likes
    10. Jonas Termansen‏ @sortiecat 29 Jul 2017
      Replying to @RichFelker @oshepherd

      Right auxv was my guess. Yet to look into .eh_frame. It's just like with TLS, already mapped, libc just needs to find it?

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 29 Jul 2017
      Replying to @sortiecat @oshepherd

      Yeah. Normal model is that libgcc_eh/libunwind calls dl_iterate_phdr (in libc) which finds the program headers for main prog & each lib.

      12:02 PM - 29 Jul 2017
      • 1 Like
      • Jonas Termansen
      1 reply 0 retweets 1 like
        1. Rich Felker‏ @RichFelker 29 Jul 2017
          Replying to @RichFelker @sortiecat @oshepherd

          Then once it has the program headers it can search for PT_GNU_EH_FRAME or whatever it's called.

          0 replies 0 retweets 0 likes
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