DOS ain't dead

DPMI - how to chain user and original RM handler? (Developers)

posted by ecm  , Düsseldorf, Germany, 29.04.2023, 15:17

> I see, it sounds simple. I can't try it just know but it is definitely
> interresting.
> But if it will for any reason not work, is possible to call the old routine
> via
> "INT 31h/0302 - Call Real Mode Procedure With IRET Frame" ?

Maybe, but you could run into reentrancy problems with the DPMI host. Better to pass execution to a Real/Virtual 86 Mode handler that will then either iret or chain to the prior handler.

---
l

Complete thread:

• DPMI - how to chain user and original RM handler? - Laaca, 29.04.2023, 00:41 (Developers)
  • DPMI - how to chain user and original RM handler? - ecm, 29.04.2023, 08:43
    • DPMI - how to chain user and original RM handler? - ecm, 29.04.2023, 08:45
      • DPMI - how to chain user and original RM handler? - Laaca, 29.04.2023, 14:04
        • DPMI - how to chain user and original RM handler? - ecm, 29.04.2023, 15:17
  • DPMI - how to chain user and original RM handler? - bretjohn, 04.05.2023, 04:03
  • DPMI - how to chain user and original RM handler? - CandyMan, 05.05.2023, 12:36
    • DPMI - how to chain user and original RM handler? - Laaca, 05.05.2023, 21:53
    • DPMI - how to chain user and original RM handler? - Laaca, 12.06.2023, 23:39