Re: Illegal op ff e8 2c in newer dosemu

["John R. Sowden" <jsowden@americansentry.net>]

On 05/06/2015 09:09 AM, Andrew Bird wrote:
> On Wed, 6 May 2015 11:16:18 -0400
> Martin Hicks <mort@bork.org> wrote:
>
>> Hello,
>>
>> I'm trying to run the NewViews 1.41b accounting program, which has been
>> happily working in dosemu / DR DOS v6.0 for years.  Now it gives an Illegal
>> Op error and exits when trying to open the accounts books directory.
>>
>> The machine is running ubuntu/x86_64, and NewViews works correctly up to
>> package version dosemu_1.4.0+svn.1999-1 but the next package release
>> does not work (dosemu_1.4.0.7+20130105+b028d3f-1).
>>
>> The following excerpt from the boot.log was with the latest git tree from the
>> 'devel' branch.  The Illegal Op is always the same, although the CPU exception
>> code seems to vary depending on the release of dosemu.  Various parts of the
>> application can be navigated through, but as soon as the directory containing
>> the accounting books is selected the crash occurs.  I presume it is scanning
>> the directory and opening files.
>>
>> I tried various cpu emulation options.  I also found one similar crash report in
>> the bug system that mentioned setting vm.mmap_min_addr to 0.  Neither
>> option helped.
>>
>> Excerpt from boot.log follows.
>> The full Debug +a log is at http://www.bork.org/~mort/boot.log
>>
>> Please let me know if any other info might help.
>> Thanks,
>> mh
>>
>> !!! Illegal op ff e8 2c
>> ==============================================================
>> CPU exception 0x0d err=0x00000000 cr2=00013aee eip=00472bda
>> ==============================================================
>> ERROR: unexpected CPU exception 0x0d err=0x00000000 cr2=00013aee while
>> in vm86 (DOS)
>>
>> Program=sigsegv.c, Line=200
>> EIP: 04f5:0000460f ESP: 23a9:000039e2  VFLAGS(b): 00000 00110111 00000110
>> EAX: 00008400 EBX: 00000012 ECX: 00006662 EDX: 00000000 VFLAGS(h): 00003706
>> ESI: 0000274f EDI: 0000069d EBP: 000039f6 DS: 274f ES: 0288 FS: 0000 GS: 0000
>> FLAGS: PF TF IF DF RF VM VIF  IOPL: 3
>> STACK: 80 c0 4f 27 9d 06 f6 39 4f 27 -> 00 00 f5 04 88 02 46 32 2c 03
>> OPS  : 0e 0a 00 00 89 0e 0c 0a e9 52 -> ff e8 2c 01 c7 06 06 0a 0e 00
>>          ffe8                04f5:460f jmp  far ax
>>
>> -- 
>> Martin Hicks P.Eng.      |         mort@bork.org
>> Bork Consulting Inc.     |   +1 (613) 266-2296
>> --
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> Hi Martin,
> 	I think you'll need to report this over at http://sourceforge.net/p/dosemu/bugs/ as this list is very quiet these days, especially for development.
>
> Hope it helps,
>
> Andrew
>
>
I thought I heard that you cannot run 16 bit DOS programs on a 64 bit 
box.  And I thought that applies to wither Windows or Linux.
Let me know as I have a 64 bit box that I am not using because of this 
DOS issue.

John