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

[Jan Kiszka <jan.kiszka@web.de>]

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Jun Koi wrote:
> On Wed, Jun 16, 2010 at 4:40 PM, Jan Kiszka <jan.kiszka@web.de> wrote:
>> Jun Koi wrote:
>>> On Wed, Jun 16, 2010 at 4:07 PM, Alfredo Mungo <chimeranet89@gmail.com> 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" ?

idtr, gdtr, ldtr, tr, crX - to name the most important ones.

Jan


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