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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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.
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).
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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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