On 3/10/21 4:45 AM, Alex Richardson wrote:
The branch main has been updated by arichardson:
URL:
https://cgit.FreeBSD.org/src/commit/?id=953a7d7c61f3b2f5351dfe668510ec782ae282e8
commit 953a7d7c61f3b2f5351dfe668510ec782ae282e8
Author: Alex Richardson <arichard...@freebsd.org>
AuthorDate: 2021-03-09 19:11:40 +0000
Commit: Alex Richardson <arichard...@freebsd.org>
CommitDate: 2021-03-10 12:44:42 +0000
Arch64: Clear VFP state on execve()
I noticed that many of the math-related tests were failing on AArch64.
After a lot of debugging, I noticed that the floating point exception flags
were not being reset when starting a new process. This change resets the
VFP inside exec_setregs() to ensure no VFP register state is leaked from
parent processes to children.
This commit also moves the clearing of fpcr that was added in 65618fdda0f27
from fork() to execve() since that makes more sense: fork() can retain
current register values, but execve() should result in a well-defined
clean state.
Reviewed By: andrew
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D29060
FYI, cpu_thread_copy() should copy the creating thread's state to the new
thread,
not reset it. POSIX actually says that new threads inherit the "floating point
environment" from the creating thread for pthread_create(). I have a patch I'm
testing to fix thix for x86.
--
John Baldwin
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