Date: Wed, 21 Oct 2020 00:15:25 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 250454] PT_GETFPREGS on i386 oversimplifies translating FPU Tag Word Message-ID: <bug-250454-227-DdJZs77VPA@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-250454-227@https.bugs.freebsd.org/bugzilla/> References: <bug-250454-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250454 --- Comment #4 from commit-hook@FreeBSD.org --- A commit references this bug: Author: kib Date: Wed Oct 21 00:15:13 UTC 2020 New revision: 366904 URL: https://svnweb.freebsd.org/changeset/base/366904 Log: Improve FPU Tag Word reconstruction on i386 to indicate register states. Improve the code reconstructing en_tw in struct fpreg32 from FXSAVE results so that all register states are indicated correctly. The previous code unconditionally mapped non-empty register state to 'normalized value' constant. The new code explicitly distinguishes the 'zero value' and 'special value' constants as well. This improves consistency between real FSAVE and translation from FXSAVE, and ensures that tests using PT_GETFPREGS can rely on a single correct value independently of the underlying implementation. PR: 250454 Sponsored by: The FreeBSD Foundation Obtained from: Moritz Systems Submitted by: Micha? G?rny <mgorny@moritz.systems> Discussed with: emaste MFC after: 1 week Differential revision: https://reviews.freebsd.org/D26856 Changes: head/sys/amd64/ia32/ia32_reg.c head/sys/i386/i386/npx.c --=20 You are receiving this mail because: You are the assignee for the bug.=
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