DOS ain't dead

lDebug release 8 (Announce)

posted by ecm  , Düsseldorf, Germany, 10.03.2024, 15:25

> Writing of which, I checked all uses of this function. I think the only
> case that may still have a 32-bit stack is in the exception handlers:
> https://hg.pushbx.org/ecm/ldebug/file/92ea23f12b9d/source/pmentry.asm#l213
>
> Can a DPMI exception handler be called with a 32-bit stack? Seems like it
> is possible, but for dosemu2 and HDPMI it seems like the stack is either
> 16-bit or ESPH is zero, as a build with _PM_ENTRY_SECTION=0
> works as expected.

Added a build option to check this: https://hg.pushbx.org/ecm/ldebug/rev/f8cde3f9652d

Both dosemu2 and HDPMI appear to set the ss B bit but leave esph as zero.

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Complete thread:

• lDebug release 8 - ecm, 08.03.2024, 19:29 (Announce)
  • lDebug release 8 - Japheth, 10.03.2024, 10:40
    • lDebug release 8 - roytam, 10.03.2024, 11:53
    • lDebug release 8 - ecm, 10.03.2024, 15:02
      • lDebug release 8 - ecm, 10.03.2024, 15:25
        • lDebug release 8 - Japheth, 11.03.2024, 10:47
    • lDebug release 8 - ecm, 11.03.2024, 09:30