Re: [Qemu-devel] address translation

["Shashidhar Mysore" <shashimc@gmail.com>]

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Hi Andrzej,

There were actually two methods described in the thread referred to in the
thread to which you were referring in your previous mail. :)
The thread was -
http://thread.gmane.org/gmane.comp.emulators.qemu/16604

I used the patch provided by Stuart Brady (in the thread referred above) -
and I believed that this is the one which helps me extract executed PC
values, until you told me in your previous email that this is _not_ the
case, and they are just the disassembled and not the executed PC trace! Can
you please let me know if you were referring to the same thread or a
different one?

Thanks,
-Shashi.

On 7/13/07, andrzej zaborowski <balrogg@gmail.com> wrote:
>
> On 14/07/07, Shashidhar Mysore <shashimc@gmail.com> wrote:
> > Thanks for the reply, Andrzej!
> >
> > Some clarifications below ...
> >
> > On 7/13/07, andrzej zaborowski <balrogg@gmail.com > wrote:
> > > >
> > > > ************************************************
> > > > /* convert one instruction. s->is_jmp is set if the translation must
> > > >    be stopped. Return the next pc value */
> > > > static target_ulong disas_insn(DisasContext *s, target_ulong
> pc_start)
> > > > {
> > > >     int b, prefixes, aflag, dflag;
> > > >     int shift, ot;
> > > >     int modrm, reg, rm, mod, reg_addr, op, opreg, offset_addr, val;
> > > >     target_ulong next_eip, tval;
> > > >     int rex_w, rex_r;
> > > >
> > > >     s->pc = pc_start;   // This s->pc is what I am using to extract
> all
> > > > executed PC values
> > >
> > > This s->pc doesn't correspond to executed PC values, qemu is a
> translator.
> >
> > Can you tell me what s->pc is, in this context? Is the the start PC of a
>
> It is the PC of the disassembled instruction (hence disasm_insn).
>
> > basic block that is about to be executed? Is there any way in which I
> could
> > extract the trace of executed PCs in QEMU?
>
> Yes, there was a thread about this about two months ago.
>
> Regards
>
>
>

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