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.
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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).
The question isn't what the kernel cares about, it's what the *bootloader* cares about. The bootloader does not care about kexts.
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iBoot doesn't care about kexts either. What is does care about though is 1. readonly segments (KTRR/CTRR) 2. RVBAR And with kernels in the "old" kernelcache format, it also cares about rebase info and slides some ptrs - but in new-style kernels, that's left to the kernel itself.
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RVBAR is actually done through a hilariously gross hack ("the start of the page the entry point is in"), so the mach-o format isn't helping there at all either :)
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