[Qemu-devel] Singlestepping & Target assembly instructions

[Qemu-devel] Singlestepping & Target assembly instructions

[Emmanuel Blot]

Hi,

I'm using QEmu to debug an ARM target (OS-less code).
I searched/googled for help on how to trace all instructions executed
on the target CPU.

Using -singlestep and -d in_asm option switches generate the data I'm
looking for, however as the translation blocks are cached, the
instructions are only printed once (the first time the instruction is
translated from target code to host code).

Is there any way to force QEmu to disable the TB cache so that the
translation occurs each time a target instruction is loaded, or a
clever way to print out the address of each executed target instruction ?

I do not care about performances (disabling the TB is likely to cause
a massive performance drawback I suppose).

Thanks,
Manu

Re: [Qemu-devel] Singlestepping & Target assembly instructions

[Richard Henderson]

On 2012-10-16 20:49, Emmanuel Blot wrote:
> Is there any way to force QEmu to disable the TB cache so that the
> translation occurs each time a target instruction is loaded, or a
> clever way to print out the address of each executed target instruction ?

"-d exec" prints the entry point of each TB as it is executed.  You can
refer to the previously disassembled insns by reference.


r~

Re: [Qemu-devel] Singlestepping & Target assembly instructions

[Laurent Desnogues]

On Tue, Oct 16, 2012 at 9:07 PM, Richard Henderson <rth@twiddle.net> wrote:
> On 2012-10-16 20:49, Emmanuel Blot wrote:
>> Is there any way to force QEmu to disable the TB cache so that the
>> translation occurs each time a target instruction is loaded, or a
>> clever way to print out the address of each executed target instruction ?
>
> "-d exec" prints the entry point of each TB as it is executed.  You can
> refer to the previously disassembled insns by reference.

If I remember correctly, that only works if block chaining is disabled.


Laurent

Re: [Qemu-devel] Singlestepping & Target assembly instructions

[Richard Henderson]

On 2012-10-17 06:17, Laurent Desnogues wrote:
> If I remember correctly, that only works if block chaining is disabled.

Which it will be with -singlestep.


r~