Microsoft KB Archive/79285

= FIX: MASM Generates a _TEXT Segment in Far Code Models =

Article ID: 79285

Article Last Modified on 11/15/2003

-

APPLIES TO


 * Microsoft Macro Assembler 6.0 Standard Edition
 * Microsoft Macro Assembler 6.0a
 * Microsoft Macro Assembler 6.0b

-



This article was previously published under Q79285



SYMPTOMS
When the assembly language module of a mixed-language program is placed in an overlay, the program hangs at startup. If the assembly module is placed in the root, the problem disappears. This problem occurs only when using the .MODEL directive in the Microsoft Macro Assembler (MASM) versions 6.0, 6.0a, or 6.0b.



CAUSE
MASM 6.0 generates a zero length _TEXT segment from source files that specify .MODEL medium, .MODEL large, or .MODEL huge. The startup code for Microsoft's high level languages is also declared in the _TEXT segment. The linker combines segments with the same name. If the assembly module is overlayed, the startup code is pulled into the overlay because the _TEXT segments will be combined. This means that the startup code is not available when the program starts executing, which causes the program to crash.



RESOLUTION
Work around this problem by removing the .MODEL directive and using full segment directives instead in any module that will be placed in an overlay.



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

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

Keywords: kbfix KB79285

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.