Microsoft KB Archive/97840

= FIX: DOSXNT DX1020 Error Using .WHILE and Processor Flag =

Article ID: 97840

Article Last Modified on 10/22/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.1 Standard Edition
 * Microsoft Macro Assembler 6.1a
 * Microsoft Macro Assembler 6.0 Standard Edition, when used with:
 * Microsoft OS/2 1.21

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This article was previously published under Q97840



SYMPTOMS
Microsoft Macro Assembler (MASM) version 6.1, and 6.1a may generate a DOSXNT DX1020 general protection fault when using the .WHILE directive to test the state of a processor flag (SIGN?, ZERO?, CARRY?, PARITY?, or OVERFLOW?). The error occurs if the processor flag is tested by itself or is negated and tested. For example:

.WHILE SIGN?

.WHILE !SIGN?

MASM version 6.0 running under OS/2 version 1.21 may generate a trap 13 in the above situation.



RESOLUTION
To work around this problem, OR the desired processor flag with zero. For example:

.WHILE SIGN? || 0

This work around will also work with ZERO?, CARRY?, PARITY?, and OVERFLOW?.



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



MORE INFORMATION
The following sample code can be used to demonstrate the problem.

Sample Code
; Assemble options needed: none

.MODEL small .STACK 4096

.DATA

.CODE .startup .WHILE SIGN? ; generates DOSXNT general protection fault nop .ENDW .WHILE SIGN? || 0 ; avoids the protection fault nop .ENDW .exit 0 END

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

Keywords: kbfix KB97840

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