Mail Archives: djgpp/1999/11/02/07:57:12
On Mon, 1 Nov 1999, Charles Sandmann wrote:
> > On Sun, 31 Oct 1999, Damian Yerrick wrote:
> >
> > > > Page Fault cr2=10000000 at eip=e75; flags=6
> > > > eax=00000030 ebx=00000000 ecx=0000000c edx=00000000
> > > > esi=0001a44a edi=00000000 ebp=00000000 esp=00002672
> > > > cs=18 ds=38 es=af fs=0 gs=0 ss=20 error=0002
> > > > ================================================
> > >
> > > Page Fault in Sandmann's CWSDPMI not in Micro$oft's DPMW32
> > >
> > > This means you are accessing an address below 0x00001000.
> >
> > Not in this case. This message comes from CWSDPMI, not from the
> > application (the latter never prints cr2 and flags, and the segment
> > registers are printed differently). Section 12.2 of the FAQ describes
> > the application crash message when dereferencing NULL pointers; you
> > will see that the format is different.
>
> You are both right. The message is from CWSDPMI, and it is
> referencing a null pointer. the 0x10000000 address is the base of the
> DPMI space, so would be where the null pointer lives.
What exactly in the above data tells that it is a NULL pointer?
AFAIK, Page Fault in a DPMI host can happen for a variety of reasons,
the null page is only one of them. (In contrast, Page Fault in a DPMI
client's code almost never happens _except_ when a null page is
accessed.)
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