Microsoft KB Archive/39439

= DOCERR: SMSW, SGDT, SIDT, SLDT, VERR, VERW Don't Assemble =

Article ID: 39439

Article Last Modified on 10/17/2003

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APPLIES TO


 * Microsoft Macro Assembler 5.0
 * Microsoft Macro Assembler 5.1 Standard Edition
 * Microsoft Macro Assembler 5.1a

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This article was previously published under Q39439



SUMMARY
The &quot;.286&quot; and &quot;.386&quot; operands do not allow the following to assemble:   SMSW, SGDT, SIDT, SLDT, VERR, and VERW One or two error messages are generated for each occurrence of these instructions.



MORE INFORMATION
Page 412 (section 20.3) of the &quot;Microsoft Macro Assembler Programmer's Guide&quot; is incorrect in saying that these instructions require &quot;privileged mode.&quot; Also, SMSW is spelled incorrectly (as &quot;SMCW&quot;). These instructions are allowed in all modes; however, behavior may differ between real and protected modes.

The reference guide is also incorrect on several addressing points. See the Intel &quot;80286 and 80287 Programmer's Reference Manual&quot; for more information.

The following is a sample program: ........................................................................ dosseg .286 .model large .data table  dw 64 dup (?) .code start: SMSW ax       SGDT table SIDT table SLDT ax       VERR ax        VERW ax
 * The following program demonstrates :

end start

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C> masm test,,,; Microsoft (R) Macro Assembler Version 5.10 Copyright (C) Microsoft Corp 1981, 1988. All rights reserved.

test.ASM(6): error A2105: Expected: instruction, directive, or label test.ASM(7): error A2105: Expected: instruction, directive, or label test.ASM(8): error A2105: Expected: instruction, directive, or label test.ASM(9): error A2105: Expected: instruction, directive, or label test.ASM(10): error A2105: Expected: instruction, directive, or label test.ASM(11): error A2105: Expected: instruction, directive, or label

24002 Bytes symbol space free

0 Warning Errors 6 Severe Errors .......................................................................

Additional query words: 5.00 5.10 5.10a

Keywords: KB39439

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