Date: Tue, 20 Jan 1998 00:04:52 +1100 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, mike@smith.net.au Cc: emulation@FreeBSD.ORG, gurney_j@resnet.uoregon.edu, rhh@ct.picker.com, shmit@erols.com Subject: Re: DOSCMD: Problems w/ Quicken Message-ID: <199801191304.AAA13791@godzilla.zeta.org.au>
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>> >Yeah, that's all fine, but what I *don't* understand is why it should >> >be trapping as it does claiming that 'movw (%bx),%ax' is an illegal >> >instruction. >> >> When %bx = 0xffff, it should cause exception 13 (general protection) >> in real mode. IIRC, this is one of the main differences between 8086's >> and later86's in real mode. > >A difference implies two different behaviours. A GPF is one, what is >the other (presumably that taken by the 8086)? Doesn't matter. >Would you guess that this might be a CPU-type detection fragment? I would guss it is a bug in the signal handling. GPF should be translated to SIGBUS with code T_PROTFLT + BUS_SEGM_FAULT and sigbus() should generate a different fatal error. Bruce
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