From:	"Stefan Viljoen" <rylan AT intekom DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: rep stosb generates a gpf:-(
Date:	Sat, 18 Sep 1999 20:51:29 +0300
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Nate Eldredge <neldredge AT hmc DOT edu> wrote in message
news:37E29DEB DOT 3961CD69 AT hmc DOT edu...
> "Santosh H." wrote:
> >
> > Hi,
> >   I was trying today to port some of my graphics functions I'd written
for
> > borland C to DJGPP(why prot mode u knucklehead!sorry:-)).Right , So i
have
> > a procedure which i converted from TASM to NASM syntax.the procedure is
as
> > below
> >
> > _Drawhorizline:
> >    push ebp
> >    mov ebp,esp
> >    push es
> >    push ds
> >
> >    mov es,_VideoSegmentSelector ;which I get by push word 0a000h
> >                                                call
___dpmi_segment_to_descriptor
> >                                                mov
[_Videosegmentselector],ax
> >    mov di,0                ;0 just for eg
> >    mov cx,80
> >    rep stosb              "BANG!"<-generates a gpf
>

I encountered EXACTLY the same problem in converting TASM code to NASM code.
Stosb stores the value in al (? was it ah?) to es:di right? I broke this
down to its components, doing something like

mov [es:di],al
inc di

Check out the code on my programming page - I deal specfically with
converting real mode TASM code for graphics to protected mode NASM/DJGPP
compatible code - the stuff I have there does exactly what you seem to want
to do.


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