Real mode interrupt vectors
Martijn van Oosterhout
kleptog at svana.org
Thu Apr 3 12:04:15 EST 2003
On Thu, Apr 03, 2003 at 08:14:30AM +1000, Michael Still wrote:
> Now I want to install the interrupt handler. I'm after interrupt 6, so I
> lea bad_opcode, %si
> mov %si, 0x1A
> mov %cs, 0x18
> This bit doesn't seem to work. My understanding that interrupt 6 should
> occupy bytes 24 - 27 in the ineterrupt vector, which is at the start of
> memory. Obviously I am wrong.
As the other guy said, you need you DS (or some segment) to be set. I only
know Intel syntax off the top of my head so bear with me:
lea si, [bad_opcode] ; or mov si, bad_opcode
mov es, ax
mov es:[6*4], si
mov es:[6*4+2], cs
Translate as appropriate.
Hope this helps,
Martijn van Oosterhout <kleptog at svana.org> http://svana.org/kleptog/
> "the West won the world not by the superiority of its ideas or values or
> religion but rather by its superiority in applying organized violence.
> Westerners often forget this fact, non-Westerners never do."
> - Samuel P. Huntington
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