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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. Longhorn‏ @never_released Jan 14
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      Meanwhile, seeing what @marcan42 just did... Having a Mach-O header present through a linker script for an _ELF_ linker is… let’s say quite unique.

      1 reply 6 retweets 65 likes
    2. Hector Martin‏ @marcan42 Jan 14
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      Replying to @never_released

      This is a Linux bootloader, why would I force people to get a mach-o toolchain to compile it? That would be silly, when mach-o is just being used as a completely unnecessary wrapper format for what should have been a simple bare-metal binary blob. 🙃

      4 replies 0 retweets 52 likes
    3. Longhorn‏ @never_released 23h23 hours ago
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      Replying to @marcan42

      Hmmm? There are very good reasons for it to be a Mach-O, mainly the thing that it’s the macOS kernel loading path. Are you advocating for kernelcaches to be flat files? And for compiling Mach-Os, you just need clang and lld installed on the system, shouldn’t be a big hurdle.

      1 reply 0 retweets 2 likes
    4. Hector Martin‏ @marcan42 21h21 hours ago
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      Replying to @never_released

      Linux ARM64 kernels are flat files even though Linux is an ELF system :-) clang "shouldn't be a big hurdle" but it's a bigger hurdle than the aarch64-linux-gnu-gcc that every person compiling anything on arm64 linux already has available.

      1 reply 0 retweets 4 likes
    5. Hector Martin‏ @marcan42 21h21 hours ago
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      Replying to @marcan42 @never_released

      The reason why OS kernels don't need to be full-fat executable formats is that they only need a tiny fraction of the features of such formats. As far as I can tell the only reason for Darwin to be using mach-o is so iBoot can preconfigure some KTRR stuff.

      2 replies 0 retweets 6 likes
    6. Longhorn‏ @never_released 21h21 hours ago
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      Replying to @marcan42

      Much more than that, it’s that the kernel cache is a bundle with the kernel extensions included too.

      1 reply 0 retweets 2 likes
      Hector Martin‏ @marcan42 20h20 hours ago
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      Replying to @never_released

      Those kexts are prelinked into one text blob these days though, which at that point isn't unlike Linux's built-in kernel modules. Linux uses tons of internal sections to implement stuff like that, but none of it needs to be visible at the bootloader ABI level.

      5:38 AM - 15 Jan 2021
      • 2 Likes
      • Just Zis Guy, You Know? Tyson Key
      1 reply 0 retweets 2 likes
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        2. Hector Martin‏ @marcan42 20h20 hours ago
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          Replying to @marcan42 @never_released

          Similarly Linux can include bare modules in a built-in initramfs, but again, the bootloader doesn't care about that (though it can supply one but that's not the only way to do it).

          1 reply 0 retweets 2 likes
        3. Hector Martin‏ @marcan42 20h20 hours ago
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          Replying to @marcan42 @never_released

          The question isn't what the kernel cares about, it's what the *bootloader* cares about. The bootloader does not care about kexts.

          1 reply 0 retweets 3 likes
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