Hello Luis and members,

I am working on Linux running on PlayStation 3, and on Fedora Core 5
for PowerPC running on our own hardware equipped with 'Cell' CPU.  
I have also been annoyed by this problem for months, because the main
core of Cell is PowerPC.  

As far as I know, the patch by Paul has a problem mentioned by the
messages below:
http://sourceware.org/ml/gdb-patches/2006-09/msg00060.html
http://sourceware.org/ml/gdb-patches/2006-09/msg00097.html
http://sourceware.org/ml/gdb-patches/2006-11/msg00049.html
http://sourceware.org/ml/gdb-patches/2006-11/msg00074.html

And the idea is a bit confusing for me...

I just thought that SOFTWARE_SINGLE_STEP_P should indicate if the
target will do software single-stepping at the next time it proceed.
And all the architectures which should skip atomic sequences of
instructions by themselves need to implement are
SOFTWARE_SINGLE_STEP_P to check if the skipping is needed, and
SOFTWARE_SINGLE_STEP to actually skip the sequence.  
# I remember someone said that ARM and MIPS have a similar problem.  

As a effect of the change above, the return value of SOFTWARE_SINGLE_STEP_P 
cannot be used as the condition of thread hopping check or removing
a software single-stepping breakpoint on handle_inferior_event: it 
may not be welcomed.  

Anyway, I will attach a patch applied on our environment.  It's for
CVS head.  
Since it's my first time of posting here, any comments are very
appreciated.  

P.S. 
I have not completed the legal process of copyright assignment, and
unfortunately the boss said to me that it will take months...
Please point me if the patch can be applied and surely needs an
assignment, I will make them hurry.  
-- 
Emi SUZUKI