Differential D29204

x86: Copy the FPU/XSAVE state from the creating thread to new threads.
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Authored by jhb on Mar 10 2021, 10:13 PM.

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rG755efb8d8fca: x86: Copy the FPU/XSAVE state from the creating thread to new threads.

Summary

POSIX states that new threads created via pthread_create() should
inherit the "floating point environment" from the creating thread.

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rG FreeBSD src repository

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Event Timeline

jhb created this revision.Mar 10 2021, 10:13 PM

Herald added a subscriber: imp. · View Herald TranscriptMar 10 2021, 10:13 PM

jhb requested review of this revision.Mar 10 2021, 10:13 PM

jhb added a child revision: D29205: Remove unused wrappers around kproc_create() and kproc_exit()..

Harbormaster completed remote builds in B37749: Diff 85519.Mar 10 2021, 10:14 PM

jhb added a parent revision: D29023: amd64: Only update fsbase/gsbase in pcb for curthread..Mar 10 2021, 10:19 PM

I tested this on amd64 using kib@'s test program from D29024.

kib added inline comments.Mar 11 2021, 5:17 AM

sys/i386/i386/vm_machdep.c
434	Why not call npxexit() there, same as for amd64?
466	This should be fine but unrelated?

jhb added inline comments.Mar 11 2021, 5:34 PM

sys/i386/i386/vm_machdep.c
434	Why not call npxexit() there, same as for amd64? This matches cpu_fork() for i386 which does not use npxexit(). If we'd rather fix i386 to use npxexit() can I throw that into this series.
466	This should be fine but unrelated? It's just part of the 'update pcb before copy logic' which now matches cpu_fork(). Since I had to add the FPU save, I figured this should mirror cpu_fork() at the same time.

This revision was not accepted when it landed; it landed in state Needs Review.Mar 12 2021, 5:50 PM

Closed by commit rG755efb8d8fca: x86: Copy the FPU/XSAVE state from the creating thread to new threads. (authored by jhb). · Explain Why

This revision was automatically updated to reflect the committed changes.

jhb added a commit: rG755efb8d8fca: x86: Copy the FPU/XSAVE state from the creating thread to new threads..

Revision Contents
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Path

Size

sys/

amd64/

amd64/

10 lines

i386/

i386/

12 lines

Diff 85651

sys/amd64/amd64/vm_machdep.c

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sys/i386/i386/vm_machdep.c

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