[Qemu-devel] Re: [Bug 581353] Re: qemu doesn't stop execution upon hitting a breakpoint

[Jun Koi]

On Wed, Jun 16, 2010 at 4:40 PM, Jan Kiszka <address@hidden> wrote:
> Jun Koi wrote:
>> On Wed, Jun 16, 2010 at 4:07 PM, Alfredo Mungo <address@hidden> wrote:
>>> Same thing happens to me, same versions as above.. I must turn to
>>> another app to accomplish my work while awaiting for a bug-fix, the code
>>> is perfectly executed but while gdb hits the breakpoints qemu goes on..
>>>
>>> --
>>> qemu doesn't stop execution upon hitting a breakpoint
>>> https://bugs.launchpad.net/bugs/581353
>>> You received this bug notification because you are a member of qemu-
>>> devel-ml, which is subscribed to QEMU.
>>
>> i think this bug has been fixed in 0.12.4. have you tried that??
>
> Or this is a well-known gdb deficit: if the bootloader operates in
> real-mode, you have to set two breakpoints, one at the linear address to
> make qemu catch it, and another one at the segment offset to avoid gdb
> skipping the exit due to ip != bp-addr.
>
> gdb is still fairly restricted when it comes to system-level debugging,
> specifically as it lacks support for special x86 registers and the
> segmented addressing mode.

what do you mean by "it lacks support for special x86 registers" ?

thanks,
J