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Rosetta doesn't correctly respect the startup registers as defined in LC_UNIXTHREAD which makes platform detection go awry. But at least Rosetta appears to consistently set rbx to 0x00000000ffffffff and rdx to 0x0000000000000001 at startup for every x64 executable I could get my hands on. So we use that to detect Rosetta's presence and set up the correct registers for XNU.
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@ -31,6 +31,18 @@
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// @noreturn
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_start:
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#if SupportsXnu()
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// Hack for detecting M1 Rosetta environment.
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// https://github.com/jart/cosmopolitan/issues/429#issuecomment-1166704377
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cmp $-1,%ebx
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jne 0f
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cmp $+1,%edx
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jne 0f
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mov $XNU,%cl
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xor %edi,%edi
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0:
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#endif
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#if SupportsFreebsd()
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// detect free besiyata dishmaya
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test %rdi,%rdi
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