Re: [Qemu-devel] Re: Missing singlestep for already-translated code?

[Alexander Graf]

On 13.04.2010, at 15:36, Jan Kiszka wrote:

> Jun Koi wrote:
>> Hi,
>> 
>> I am looking into the singlestep command in monitor interface, and it
>> seems that we only take into account the singlestep flag when we are
>> translating code.
>> So for the already-translated code, we will miss singlestep?
> 
> This feature is broken. For TCG, it should at least flush the
> translation buffer, and for KVM it has to enable single-stepping in the
> kernel. That's what happens automatically when you call cpu_single_step.
> I guess 'singlestep' wants to be somehow orthogonal to this. But this is
> the wrong approach.
> 
> Does anyone actually used this feature or still does so? It looks fairly
> redundant to me, kind of a poor-man's gdb front-end as part of the
> monitor console.

Not sure what it does, but I use -singlestep quite a lot to get register dumps 
for instructions when using -d cpu.

Alex