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[XTENSA] Remove non-rt signal handling

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The non-rt signal handling was never really used, so we don't break
anything. This patch also cleans up the signal stack-frame to make
it independent from the processor configuration. It also improves
the method used for controlling single-stepping. We now save and
restore the 'icountlevel' register that controls single stepping
and set or clear the saved state to enable or disable it.

Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Chris Zankel 2007-05-31 17:49:32 -07:00
commit 29c4dfd92e
8 changed files with 350 additions and 524 deletions
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