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Groups > linux.kernel > #1293697 > unrolled thread

[RFC] Correct usage of swapgs instruction in arch/x86

Started byJeff Merkey <linux.mdb@gmail.com>
First post2015-12-17 10:20 +0100
Last post2015-12-17 10:20 +0100
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  [RFC] Correct usage of swapgs instruction in arch/x86 Jeff Merkey <linux.mdb@gmail.com> - 2015-12-17 10:20 +0100

#1293697 — [RFC] Correct usage of swapgs instruction in arch/x86

FromJeff Merkey <linux.mdb@gmail.com>
Date2015-12-17 10:20 +0100
Subject[RFC] Correct usage of swapgs instruction in arch/x86
Message-ID<qGCT8-5Pb-13@gated-at.bofh.it>
Propose complete review of Linux architecture and use of swapgs
instruction to enable kgdb, kdb, mdb, kprobes, and other debugging
tools to operate correctly.

Linux currently does not support the above listed tools due to an
architectural limitation in the way Linux deals with
userspace/kernelspace transitions.
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