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Q85509: FIX: ORG Calculated from Label May Fail in 6.0a/6.0b

Article: Q85509
Product(s): Microsoft Macro Assembler
Version(s): MS-DOS:6.0a,6.0b
Operating System(s): 
Keyword(s): 
Last Modified: 06-MAY-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Macro Assembler (MASM), versions 6.0a, 6.0b 
-------------------------------------------------------------------------------

SYMPTOMS
========

In Microsoft Macro Assembler (MASM) versions 6.0a and 6.0b, if the expression
for an ORG directive is calculated from a label, the ORG directive will not give
the correct results. The origin set by the ORG directive will be off by the
value of the current location counter ($) prior to the ORG directive.

RESOLUTION
==========

The sample code below demonstrates a macro that can be used to correct the
behavior of ORG. This macro should be used only if the expression being supplied
to ORG was calculated using a label. If the expression being supplied to ORG was
not calculated using any labels, the ORG directive should work correctly.

This macro works correctly only under MASM versions 6.0a and 6.0b.

STATUS
======

Microsoft has confirmed this to be a problem in MASM versions 6.0a, and 6.0b.
This problem was corrected in MASM for MS-DOS version 6.1.

MORE INFORMATION
================

Sample Code
-----------

  ; Assemble options needed: none

  ORGFIX MACRO arg1             ; This macro can be used
     ORG (arg1- ($- @CurSeg))   ; whenever the origin you are
  ENDM                          ; trying to set contains a LABEL
                                ; or $ as part of the expression.
  .MODEL small
  .STACK 4096

  .CODE
  start LABEL BYTE
     .startup
     .exit 0
  finish LABEL BYTE

  ORG ((finish- start)+ 10h)    ; This will incorrectly set
  tst1 LABEL BYTE               ; the origin.

  ORGFIX ((finish- start)+ 10h) ; This will correctly set
  tst2 LABEL BYTE               ; the origin.

     DB 'hello'
  END

Additional query words: 6.00a 6.00b buglist6.00a buglist6.00b fixlist6.10

======================================================================
Keywords          :  
Technology        : kbMASMsearch kbAudDeveloper kbMASM600a kbMASM600b
Version           : MS-DOS:6.0a,6.0b
Solution Type     : kbfix

=============================================================================

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