[openrisc] or1ksim with gdb

[Chris Ziomkowski<chris@asics.ws>]

A new version of or1ksim and gdb has been checked into
the CVS archive.

New in this version is the ability to download code to
the architectural simulator via gdb's "load" command,
set a breakpoint, and type run.

There are still several bugs related to running with
gdb. Namely, continuing after a breakpoint does not
appear to be 100% reliable, and the code does not
exit when finished. These issues are currently under
investigation.

Watchpoints are not currently enabled. The previous version
of gdb was assuming that anything not a hardware breakpoint
was a watchpoint. This policy is incorrect, (it ignores
signals and soft breakpoints) and a new algorithm needs to
be developed that deals reasonably with watchpoints in the
gdb environment. Similarly, the code for the trace module
of the development interface has not yet been implemented
in or1ksim.

You will need the latest versions of or1ksim and gdb to make
this functional. A file "README.gdb" has been added to the
or1ksim module to help you begin debugging using this interface.
Additional work may be required before this is stable enough
to do serious development work with it.

Chris Ziomkowski
chris@asics.ws


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