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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>
To:	djgpp AT delorie DOT com
Subject:	Max value of DpmiLimit registry setting in Windows 10 32 bit
Message-ID:	<410d8515-84ba-c47e-1f90-f60a944d8668@iki.fi>
Date:	Wed, 21 Mar 2018 19:55:56 +0200
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Some experience with DJGPP under Windows 10 Home 32 bit lately (VirtualBox VM under ArchLinux)

Attempt to run DJGPP program from another one failed:

C:\Users\andris>sh
sh-2.05b$ sh
Exiting due to signal SIGSEGV
Stack Fault at eip=00000a11
eax=00010001 ebx=000f0080 ecx=0009f200 edx=000007bf esi=00000c19 edi=00000c09
ebp=0026773a esp=0026773a program=C:\DJGPP\BIN\SH.EXE
cs: sel=00cf  base=000d3a40  limit=00000db0
ds: sel=00b7  base=000cc150  limit=0000ffff
es: sel=0040  invalid
fs: sel=0000
gs: sel=0000
ss: sel=00b7  base=000cc150  limit=0000ffff
App stack: [00263aa0..000e3aa4]  Exceptn stack: [000e3190..000e1250]

It  worked (earlier setup) in the begin of February 2018 as I built gcc-8.0.1 development version then.

I got however it working by decreasing HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\WOW\DpmiLimit 
from 0x7FFF0000 to 0x7EFF0000 (no restart needed after change). No attempts done to find more exact 
value.

The change of max value of DpmiLimit is most likely caused by 2018-02 cumulative update (noticed 
problem before 2018-03 cumulative update were installed).

Let's see how build of gcc-8.0.1-20180318 will go (it at least do not fail immediately as with 
DpmiLimit=0x7FFF0000)

Andris

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