From: "Santosh H." <hsantosh AT giasbga DOT vsnl DOT net DOT in>
Newsgroups: comp.os.msdos.djgpp
Subject: rep stosb generates a gpf:-(
Date: Wed, 15 Sep 1999 15:09:53 +0530
Organization: VSNL
Lines: 44
Message-ID: <Pine.SOL.3.96.990915144809.14092B-100000@giasbgb>
NNTP-Posting-Host: giasbgb.vsnl.net.in
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Trace: news.vsnl.net.in 937425981 25073 202.54.12.162 (15 Sep 1999 20:06:21 GMT)
X-Complaints-To: postmaster AT news DOT vsnl DOT net DOT in
NNTP-Posting-Date: 15 Sep 1999 20:06:21 GMT
X-Sender: hsantosh AT giasbgb
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

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
   
 Since rep stosb is to fast to forego can some programming guru tell me
why this harmless instruction is acting up.I also tried 
mov byte [es:di],al but still i get a gpf at the same instruction:-(.Is
there some fancy pmode instruction which I'm supposed to use to load es
.BTW that bit of code to get the _Videosegmentselector  was got from
Matthew Mastracci's inttest example in DJGPPASM.zip from delorie
com.Strangely When I put the mov [fs:di],al instruction within  a loop to
run cx times i get a gpf at that instruction at the very first pass??

  So i guess u guru's got the problem  and any help mailed to
hsantosh AT giasbga DOT vsnl DOT net DOT in will be verrry nice.Thanx to the guru's in
advance

Santosh
        
           P.S:I HATE MICROSOFT !!!!#@!

******************************************************************
Santosh .H :
Activities  Linux Linux and only Linux :-)
Thought for a lifetime:
   Only Wimps use MS windows
   Toughs use Linux:-)
******************************************************************