Microsoft KB Archive/95121

= FIX: L1101 Error Linking MASM Object Module w/ Large Structure =

Article ID: 95121

Article Last Modified on 10/20/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.0 Standard Edition
 * Microsoft Macro Assembler 6.0a
 * Microsoft Macro Assembler 6.0b
 * Microsoft Macro Assembler 6.1 Standard Edition
 * Microsoft Macro Assembler 6.1a
 * Microsoft Macro Assembler 6.11 Standard Edition

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This article was previously published under Q95121



SYMPTOMS
An attempt to link an application assembled with the Microsoft Macro Assembler (MASM) fails and the Microsoft Link utility (LINK) generates the following message:

fatal error L1101: invalid object module



CAUSE
MASM generates an incorrect LIDATA record when the source code declares large data structures.



RESOLUTION
To work around this problem, organize structure initialization into a series of DUP directives, as shown below. If necessary, MASM processes the structure into several LIDATA records. msg_str STRUCT msg    BYTE 44 DUP(120), 10, 13 BYTE 44 DUP(111), 10, 13 BYTE 44 DUP(120), 10, 13 BYTE 44 DUP(111), 10, 13 BYTE 44 DUP(120), 10, 13 BYTE 44 DUP(111), 10, 13 BYTE 44 DUP(120), 10, 13 BYTE 44 DUP(111), 10, 13 BYTE 44 DUP(120), 10, 13 BYTE '$' msg_str ENDS



STATUS
Microsoft has confirmed this to be a problem in MASM versions 6.0, 6.0a, 6.0b, 6.1, and 6.1a. This problem was corrected in MASM for MS-DOS version 6.11.



MORE INFORMATION
The code example below demonstrates this problem. Even though MASM is designed to create multiple LIDATA records for a data structure larger than 512 bytes, the assembler creates one LIDATA record for the entire data structure. When this occurs, the L1101 error occurs as indicated above.

See &quot;The MS-DOS Encyclopedia&quot; (Microsoft Press) for more information on the LIDATA record or other aspects of the object module format.

Sample Code
; Assemble options needed: none

.MODEL small .STACK 4096

.DATA msg_str STRUCT msg    BYTE &quot;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&quot;, 10, 13 BYTE &quot;oooooooooooooooooooooooooooooooooooooooooooo&quot;, 10, 13 BYTE &quot;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&quot;, 10, 13 BYTE &quot;oooooooooooooooooooooooooooooooooooooooooooo&quot;, 10, 13 BYTE &quot;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&quot;, 10, 13 BYTE &quot;oooooooooooooooooooooooooooooooooooooooooooo&quot;, 10, 13 BYTE &quot;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&quot;, 10, 13 BYTE &quot;oooooooooooooooooooooooooooooooooooooooooooo&quot;, 10, 13 BYTE &quot;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&quot;, 10, 13 BYTE '$' msg_str ENDS

struct_str msg_str 2 DUP (<>)

.CODE main PROC mov ax, @DATA mov ds, ax

mov ah, 9h                   ; Request DOS Function 9. mov dx, OFFSET struct_str.msg ; Load DX with offset ; (segment already in DS). int 21h                      ; Display String.

mov ax, 4c00h int 21h main ENDP END main

Additional query words: 6.00 6.00a 6.00b 6.10 6.10a buglist6.00a buglist6.00b buglist6.10 buglist6.10a fixlist6.11

Keywords: kbfix KB95121

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