Re: [PATCH][Qemu-devel] Single stepping for PPC broken!

[Marius Groeger]

On Wed, 9 Jan 2008, Marius Groeger wrote:

> On Wed, 9 Jan 2008, Marius Groeger wrote:
> 
> > I'm having problems with qemu's (-M prep, -cpu 604) handling of the 
> > MSR_SE bit. My gdbstub can successfully step along regular code, but 
> > qemu chokes when stepping over a branch instruction like "blr". 
> > (Needless to say, that same gdbstub works fine on real hardware). I 
> > tried older versions of qemu and found that the code base 8 months ago 
> > worked fine.
> 
> I have now verified with booting a Linux image into qemu-system-ppc - same
> problem. When stepi'ing over the following sequence, the system chokes on a
> "bl" instruction:

The attached patch fixes the problem, but I have to admit I can't tell 
for sure if this doesn't break other things (such as qemu's built-in 
GDB server). Could some QEMU ppc expert please comment on this?

Thanks
Marius

-- 
Marius Groeger <address@hidden>
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ppc-singlestep.diff
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