Re: [Qemu-devel] Re: [PATCH] i386 debugging stubs: Consider segment bases

[Jan Kiszka]

Am 26.09.2010 19:19, Eddie Kohler wrote:
> OK, thanks.  I understand how you're relying on the current behavior.
> 
> I'd rather not change all of QEMU and GDB in one step,

The first step is changing gdb anyway.

> but I'd like to
> address this.  QEMU documentation implies, and new users expect, that
> debugging uses virtual addresses, not the segmentation-specific "linear
> addresses" that are actually used now.
> 
> - How about a maintenance packet type that changed behavior to what I
> would prefer (breakpoints and memory access use virtual addresses, not
> linear addresses)?
> 
> - We could add a "segment identifier" parameter to
> cpu_get_phys_page_debug, ignored on all targets but i386 at first.  Then
> we could pass information through to cpu_get_phys_page_debug about what
> kind of address is being translated.  This change could be propagated to
> cpu_memory_rw_debug (now or later).  Would you object?

These changes would establish a temporary interface for an incomplete
workaround, and that even with impact on non-x86 code. I would prefer if
you could invest your time on the gdb side instead. Anything improved
there is not lost - in contrast to the modifications of qemu. I would
try to support any effort in this direction.

BTW, gdb has nice Python binding these days, so some extensions may also
start their life as a helper script.

Jan

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