Re: debug x86 custom OS

[Danilo Nascimento <danilonc () bugnotfound com>]

Did You try to run it on qemu?
Qemu has the -s switch that may do what you want.

Em terça-feira, 17 de setembro de 2013, Chris Campbell escreveu:

> If it runs on Intel can you not run it in VMware with debugging turned on?
>
> http://wiki.osdev.org/VMware
>
> --
> Chris Campbell
>
> On 17 September 2013 at 19:48:50, HaQue (admin () smartwave-wireless com<javascript:_e({}, 'cvml', 'admin () 
> smartwave-wireless com');>)
> wrote:
>
> Hi all,
>
> Long time listener, first time caller.
>
> The hint to post here came from Intern Mikes great talk at B-Sides.
>
> I am hoping that someone here can give me some pointers on how to
> debug/monitor a custom OS that runs on a standard Intel mainboard.
> Basically it boots up and used the hardware directly, the Intel chipset
> and integrated video. Doesn't run on DOS, windows or Linux, is not a
> Linux or DOS "derivative or clone. It does use hardware interrupts, and
> I believe BIOS routines.
>
> Obviously this means custom drivers and executables (which are very
> few).
>
> IDA sees the driver files as "MS-DOS SYS-file(perhaps device
> driver)[dos.ldw]" and I get some coherent code mentioning interrupts,
> such as Strategy_Routine, Interrupt_Routine but nothing to really speak
> of.
>
> I Initially thought to hook up to the serial port and monitor with
> another PC, similar to what you would do in an embedded system, though
> quickly realised that this output of dmesg Is programmed into Linux, and
> no such functionality exists in my case.
>
> Short of JTAG on the CPU or video, is there anything anyone could
> suggest to figure out the routines?
>
> Is there anything on a standard Intel PC motherboard that can help?
>
> All the embedded hardware hacking I have done doesn't seem to transfer
> to this, and though ripping apart the software is kind of helpful to see
> the overall picture of how the system works, I don't see how to use the
> info to interact with the OS aside from the basic, intended
> functionality.
>
> Any tips or links to sites that may help would be great.
>
> Cheers,
>
> HaQue
>
> -----------------------------------------------------------
> Is "Gone in 60 Seconds" a movie about Warranty Stickers?
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-- 
[]'s Danilo Nascimento

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