Date: Sat, 20 Sep 2003 13:34:58 -0700 (PDT) From: Marcel Moolenaar <marcel@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/ia64/ia64 machdep.c Message-ID: <200309202034.h8KKYwoC018877@repoman.freebsd.org>
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marcel 2003/09/20 13:34:58 PDT
FreeBSD src repository
Modified files:
sys/ia64/ia64 machdep.c
Log:
Fix the last remaining problem encountered by KSE: apparently it is
not guaranteed that the RSE writes the NaT collection immediately,
sort of atomically, to the backing store when it writes the register
immediately prior to the NaT collection point. This means that we
cannot assume that the low 9 bits of the backingstore pointer do not
point to the NaT collection. This is rather a surprise and I don't
know at this time if it's a bug in the Merced or that it's actually
a valid condition of the architecture. A quick scan over the sources
does not indicate that we depend on the false assumption elsewhere,
but it's something to keep in mind.
The fix is to write the saved contents of the ar.rnat register to
the backingstore prior to entering the loop that copies the dirty
registers from the kernel stack to the user stack.
Revision Changes Path
1.156 +5 -1 src/sys/ia64/ia64/machdep.c
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