Change to allow signal handlers to set SE and BE bits.

[Matt Porter]

On Fri, Aug 29, 2003 at 03:00:51PM -0500, Corey Minyard wrote:
> I have a debugger that runs in an application that requires access to
> the SE and BE bits.  The following patch adds that capability to
> 2.4.21-ben1.  I have tested this, and gdb still seems to correctly step
> out of signal handlers, and it seems to work for 4xx.  Does this look ok?

Please change MSR_SE->MSR_DWE in the 4xx-specific sections.  Also,
a comment should be added to each generic section use of MSR_SE to
make it clear that this is the BookE/4xx MSR_DWE.

-Matt

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