Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.os.msdos.programmer > #1366

Re: detecting emulation or console windows

Path csiph.com!usenet.pasdenom.info!aioe.org!.POSTED!not-for-mail
From "Rod Pemberton" <dont_use_email@xnothavet.cqm>
Newsgroups alt.os.development, comp.os.msdos.programmer, alt.lang.asm
Subject Re: detecting emulation or console windows
Date Sat, 31 May 2014 20:54:26 -0400
Organization Aioe.org NNTP Server
Lines 37
Message-ID <op.xgq3g0ya6zenlw@localhost> (permalink)
References <op.xgqwuvss6zenlw@localhost> <lmdqcl$1oj$1@rumours.uwaterloo.ca>
NNTP-Posting-Host CNsg4fVcCsvs3UaOgZtQCw.user.speranza.aioe.org
Mime-Version 1.0
Content-Type text/plain; charset=iso-8859-1; format=flowed; delsp=yes
Content-Transfer-Encoding 7bit
X-Complaints-To abuse@aioe.org
User-Agent Opera Mail/12.16 (Linux)
X-Notice Filtered by postfilter v. 0.8.2
Xref csiph.com comp.os.msdos.programmer:1366

Cross-posted to 3 groups.

Show key headers only | View raw

On Sat, 31 May 2014 19:59:16 -0400, Ross Ridge  
<rridge@csclub.uwaterloo.ca> wrote:
> Rod Pemberton <dont_use_email@xnothavet.cqm> wrote:

>> I've looked at CR0.PE, but dosemu emulates MOV CRO and SMSW
>> accurately enough that those instructions are *not* useful,
>> i.e., they indicate CR0.PE is clear even when under emulation.
>
> DOSBox and dosemu on 64-bit Linux both emulate a real-mode environment,
> not a virtual 8086 environment so that's why the PE bit is clear.

That's one part of the point, but not the critical part, IMO.

CR0.PE should be emulated as clear for DOSBox which uses your own DPMI host
(except for one or two old versions which had DPMI enabled...).  IMO,  
CR0.PE
should be emulated as _set_ for dosemu since dosemu provides it's own  
32-bit
PM DPMI host.  I.e., dosemu should report as PM, meaning v86 instead of RM.
However, it doesn't until something uses DPMI.

> If your application expects actual real mode and doesn't work in either
> of these emulators [...]

The problem isn't the code.  It's a standard 32-bit PM DPMI (GCC via DJGPP)
application with a 16-bit RM startup.  The problem is that the code  
basically
runs everywhere, including under environments where it shouldn't be  
executed,
such as under OSes like Windows 98/SE/NT/2K/XP, and emulation such as  
DOSBox
and dosemu.  So, I'd like to detect and reject these environments.  The  
other
option is to just let the user try and fail.


Rod Pemberton

Back to comp.os.msdos.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-05-31 18:31 -0400
  Re: detecting emulation or console windows Ross Ridge <rridge@csclub.uwaterloo.ca> - 2014-05-31 19:59 -0400
    Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-05-31 20:54 -0400
      Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-05-31 21:43 -0400
        Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-01 22:48 +0100
          Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 00:46 -0400
            Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-02 06:15 +0100
              Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 03:21 -0400
                Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 03:32 -0400
                Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-02 09:51 +0100
                Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 09:27 -0400
                Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-02 17:05 +0100
                Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 19:25 -0400
                Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-04 07:55 +0100
                Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-04 03:20 -0400
      Re: detecting emulation or console windows Ross Ridge <rridge@csclub.uwaterloo.ca> - 2014-06-01 14:03 -0400
        Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 00:53 -0400
          Re: detecting emulation or console windows Ross Ridge <rridge@csclub.uwaterloo.ca> - 2014-06-02 15:55 -0400
            Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 19:27 -0400
              Re: detecting emulation or console windows Ross Ridge <rridge@csclub.uwaterloo.ca> - 2014-06-03 17:00 -0400
  Re: detecting emulation or console windows Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2014-06-01 06:25 +0200
    Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-01 02:50 -0400
  Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-01 07:53 +0100
    Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-01 04:53 -0400
      Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-01 20:57 +0100
        Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 00:48 -0400
      Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 03:20 -0400
  Re: detecting emulation or console windows JJ <duh@nah.meh> - 2014-06-02 03:43 +0700
    Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-02 00:34 -0400
    Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-03 07:06 -0400
      Re: detecting emulation or console windows JJ <duh@nah.meh> - 2014-06-03 20:25 +0700
  Re: detecting emulation or console windows "wolfgang kern" <nowhere@never.at> - 2014-06-03 20:52 +0200
  Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-03 22:59 +0100
    Re: detecting emulation or console windows CN <qmbmnp3799@pacbell.net> - 2014-06-03 18:39 -0700
      Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-04 07:06 +0100
        Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-04 03:07 -0400
          Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-04 09:16 +0100
  Re: detecting emulation or console windows "James Harris" <james.harris.1@gmail.com> - 2014-06-03 23:00 +0100
  Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-06-10 17:37 -0400
    Re: detecting emulation or console windows Wildman <best_lay@yahoo.com> - 2014-06-11 00:37 +0000
      Re: detecting emulation or console windows "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-07-27 12:11 -0400

csiph-web