delorie.com/archives/browse.cgi   search  
Mail Archives: djgpp/2000/11/07/07:00:46

Message-ID: <3A07EB2D.129F2831@math.klte.hu>
From: Peter Sulyok <sulyok AT math DOT klte DOT hu>
X-Mailer: Mozilla 4.06 [en] (WinNT; I)
MIME-Version: 1.0
Newsgroups: comp.os.msdos.djgpp
Subject: MASM 6.11 problem
Lines: 136
Date: Tue, 07 Nov 2000 11:45:13 GMT
NNTP-Posting-Host: 172.24.124.47
X-Complaints-To: newsmaster AT nokia DOT com
X-Trace: news1.nokia.com 973597513 172.24.124.47 (Tue, 07 Nov 2000 13:45:13 EET)
NNTP-Posting-Date: Tue, 07 Nov 2000 13:45:13 EET
Organization: Nokia
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com 

--------------5AB5B87741CDD3A70D60C8AC
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Hi,

I wrote a general interrupt calling routine in assembly (don't ask me
why),
and it's working perfectly with some other real\protected C compiler
(Watcom C,
Borland C etc.).
When I started to use this code with DJGPP 2.03, I used MASM 6.11
to create COFF object file from my (Intel syntax) assembly source.
Running this code, I got some runtime error, so I had to debug this with
FSDB.

At this point, it seems the linker doesn't relocate the code properly,
because all
OFFSET expressions (see the marks in the following code) have the same
value
(= address of function __Int), and that's why my program hangs up
immediately.

__Int    PROC     C, \
         @@n:uchar, @@inregs:fardataptr, @@outregs:fardataptr

         LOCAL    @@SaveDS:ushort

         PUSHREGS                         ; Save all registers.
                                          ;
         mov      @@SaveDS,ds             ; Save DS.
         push     _BP                     ; Save _BP register.
                                          ;
->       mov      _AX,OFFSET @@3          ; Put the return address into
         push     _AX                     ; the stack.
                                          ;
->       mov      _AX,OFFSET IntTable     ; Calculate the address of
adequte
         IFDEF __32BIT__                  ; interrupt instruction in the

         movzx    ebx,@@n                 ; interrupt table.
         ELSE                             ;
         xor      bh,bh                   ;
         mov      bl,@@n                  ;
         ENDIF                            ;
         shl      _BX,2                   ;
         add      _AX,_BX                 ;
         push     _AX                     ; Push address into stack.
         .........

Has anybody any idea about it?
Thanks,

Peter

--------------5AB5B87741CDD3A70D60C8AC
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
Hi,
<P>I wrote a general interrupt calling routine in assembly (don't ask me
why),
<BR>and it's working perfectly with some other real\protected C compiler
(Watcom C,
<BR>Borland C etc.).
<BR>When I started to use this code with DJGPP 2.03, I used MASM 6.11
<BR>to create COFF object file from my (Intel syntax) assembly source.
<BR>Running this code, I got some runtime error, so I had to debug this
with FSDB.
<P>At this point, it seems the linker doesn't relocate the code properly,
because all
<BR>OFFSET expressions (see the marks in the following code) have the same
value
<BR>(= address of function __Int), and that's why my program hangs up immediately.
<P><TT>__Int&nbsp;&nbsp;&nbsp; PROC&nbsp;&nbsp;&nbsp;&nbsp; C, \</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; @@n:uchar, @@inregs:fardataptr,
@@outregs:fardataptr</TT>
<P><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LOCAL&nbsp;&nbsp;&nbsp;
@@SaveDS:ushort</TT>
<P><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PUSHREGS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
; Save all registers.</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
@@SaveDS,ds&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
; Save DS.</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;&nbsp;&nbsp;&nbsp;
_BP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
; Save _BP register.</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>->&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
_AX,OFFSET @@3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ;
Put the return address into</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;&nbsp;&nbsp;&nbsp;
_AX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
; the stack.</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>->&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
_AX,OFFSET IntTable&nbsp;&nbsp;&nbsp;&nbsp; ; Calculate the address of
adequte</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IFDEF __32BIT__&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
; interrupt instruction in the</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movzx&nbsp;&nbsp;&nbsp;
ebx,@@n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
; interrupt table.</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ELSE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; xor&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh,bh&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bl,@@n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ENDIF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; shl&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
_BX,2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; add&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
_AX,_BX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
;</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;&nbsp;&nbsp;&nbsp;
_AX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
; Push address into stack.</TT>
<BR><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .........</TT>
<P><TT>Has anybody any idea about it?</TT>
<BR><TT>Thanks,</TT><TT></TT>
<P><TT>Peter</TT></HTML>

--------------5AB5B87741CDD3A70D60C8AC--

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019