Re: debug x86 custom OS

[HaQue <admin () smartwave-wireless com>]

Thank you to all the responses so far.
I will be looking at Qemu today.

The hardware this system runs on is Intel 810e,815, 845 based 
motherboards only. basically PentiumIII and 4.
It is very specifically written to access this hardware directly, with 
no bloat whatsoever.

This is why emulation and virtualisation is so tricky.  Unless I can get 
the VM/emu to mimick these exact mainboards, Its going to crash.

On 2013-09-18 10:30, Danilo Nascimento wrote:
> 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 [3]
> >
> > -- 
> > Chris Campbell
> >
> > On 17 September 2013 at 19:48:50, HaQue
> > (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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> > >
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>
> --
> []'s Danilo Nascimento
>
>
> Links:
> ------
> [1] http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom
> [2] http://pauldotcom.com
> [3] http://wiki.osdev.org/VMware
>
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