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Date: Tue, 03 Apr 2018 19:56:49 +0300
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From: "Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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Subject: Re: Death of DJGPP support on Win10 32 bit? [WAS: Re: Max value of
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> From: "Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
> Date: Tue, 3 Apr 2018 19:27:57 +0300
> 
> starting under GDB (surprising but it still works)

Running a program inside GDB does not created nested DPMI clients,
because GDB just longjmp's to the debuggee's code.

> (gdb) c
> Continuing.
> ret=0
> Exiting due to signal SIGSEGV
> Stack Fault at eip=00000a11
> eax=00010001 ebx=00040080 ecx=0002d400 edx=000007bf esi=00007022 edi=00017012
> ebp=000a773a esp=000a773a program=d:\Test\7\runpgm.exe
> cs: sel=00cf  base=000d39f0  limit=00000db0
> ds: sel=00b7  base=000cc100  limit=0000ffff
> es: sel=0040  invalid
> fs: sel=0000
> gs: sel=0000
> ss: sel=00b7  base=000cc100  limit=0000ffff
> App stack: [000a8eb0..00028eb4]  Exceptn stack: [00028de0..00026ea0]

Looks like segment registers are all wrong?

Charles, are you still there?  Can you tell what's going on here?