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Differential D25248

Make Linux uname(2) return x86_64 to 32-bit apps
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Authored by trasz on Jun 12 2020, 8:24 PM.
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emaste
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Linux Emulation
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rS362205: Make Linux uname(2) return x86_64 to 32-bit apps. This helps Steam.
Summary

Make Linux uname(2) return x86_64 to 32-bit apps.
This fixes PR 240432.

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rS FreeBSD src repository - subversion
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Buildable 31669
Build 29247: arc lint + arc unit

Event Timeline

trasz created this revision.Jun 12 2020, 8:24 PM
Herald added a subscriber: imp. · View Herald TranscriptJun 12 2020, 8:24 PM
trasz requested review of this revision.Jun 12 2020, 8:24 PM
Harbormaster completed remote builds in B31669: Diff 73034.Jun 12 2020, 8:24 PM
trasz added a reviewer: Linux Emulation.Jun 12 2020, 8:25 PM
kib added a subscriber: kib.Jun 12 2020, 8:34 PM

Curious, what Linux reports for arm 32bit binaries on arm64 host ?

trasz added a comment.Jun 12 2020, 9:00 PM

I have no idea, I'm afraid.

emaste added a subscriber: emaste.Jun 12 2020, 9:39 PM

lazytwitter turned up https://unix.stackexchange.com/questions/136407/is-my-linux-arm-32-or-64-bit for me,

On a 64-bit processor, you'd see a string starting with armv8 (or above) if the uname process itself is a 32-bit process, or aarch64 if it's a 64-bit process.

emaste added a comment.Jun 12 2020, 11:49 PM

https://twitter.com/agentdero/status/1271570495041761281
looks like it's actually aarch64 for 32-bit uname on 64-bit kernel

trasz added a comment.Jun 13 2020, 9:10 AM

We also need to know what's being returned by getauxval. You can use https://people.freebsd.org/~trasz/u.c to check it.

trasz added a comment.Jun 14 2020, 9:52 PM

(Tinderboxed.)

emaste accepted this revision.Jun 14 2020, 10:22 PM

https://twitter.com/duncaen/status/1271714593816162304
After setarch linux32 the architecture says armv8l

This revision is now accepted and ready to land.Jun 14 2020, 10:22 PM
Closed by commit rS362205: Make Linux uname(2) return x86_64 to 32-bit apps. This helps Steam. (authored by trasz). · Explain WhyJun 15 2020, 8:12 PM
This revision was automatically updated to reflect the committed changes.
trasz added a commit: rS362205: Make Linux uname(2) return x86_64 to 32-bit apps. This helps Steam..

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sys/
compat/
linux/
10 lines

Diff 73034

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sys/compat/linux/linux_misc.c

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