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authorFrederic Weisbecker <fweisbec@gmail.com>2010-11-11 21:18:43 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2010-11-12 14:51:01 +0100
commit6c0aca288e726405b01dacb12cac556454d34b2a (patch)
tree97df095d38cdbb6de009df8786bbafb697bdfab8 /kernel
parent169ed55bd30305b933f52bfab32a58671d44ab68 (diff)
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x86: Ignore trap bits on single step exceptions
When a single step exception fires, the trap bits, used to signal hardware breakpoints, are in a random state. These trap bits might be set if another exception will follow, like a breakpoint in the next instruction, or a watchpoint in the previous one. Or there can be any junk there. So if we handle these trap bits during the single step exception, we are going to handle an exception twice, or we are going to handle junk. Just ignore them in this case. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=21332 Reported-by: Michael Stefaniuc <mstefani@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Maciej Rutecki <maciej.rutecki@gmail.com> Cc: Alexandre Julliard <julliard@winehq.org> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: All since 2.6.33.x <stable@kernel.org>
Diffstat (limited to 'kernel')
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