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Work around Rosetta clobbering startup registers on M1 Macs (issue #429) (#453)

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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.
This commit is contained in:
Daniil Kulchenko 2022-06-27 16:28:59 -07:00 • committed by GitHub
parent 5297897ba1
commit 9f8e6c10dd
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4 changed files with 38 additions and 4 deletions
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ape/loader.c
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@ -595,11 +595,11 @@ __attribute__((__noreturn__)) void ApeLoader(long di, long *sp, char dl,
// detect freebsd
if (handoff) {
os = handoff->os;
} else if (SupportsXnu() && dl == XNU) {
os = XNU;
} else if (SupportsFreebsd() && di) {
os = FREEBSD;
sp = (long *)di;
} else if (SupportsXnu() && dl == XNU) {
os = XNU;
} else {
os = 0;
}