From: Chris Metcalf <cmetcalf@tilera.com>
Date: Mon, 16 May 2011 18:23:44 +0000 (-0400)
Subject: arch/tile: support signal "exception-trace" hook
X-Git-Tag: v3.0-rc1~152^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=571d76acdab95876aeff869ab6449f826c23aa43;p=pandora-kernel.git

arch/tile: support signal "exception-trace" hook

This change adds support for /proc/sys/debug/exception-trace to tile.
Like x86 and sparc, by default it is set to "1", generating a one-line
printk whenever a user process crashes.  By setting it to "2", we get
a much more complete userspace diagnostic at crash time, including
a user-space backtrace, register dump, and memory dump around the
address of the crash.

Some vestiges of the Tilera-internal version of this support are
removed with this patch (the show_crashinfo variable and the
arch_coredump_signal function).  We retain a "crashinfo" boot parameter
which allows you to set the boot-time value of exception-trace.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
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