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

• Microsoft Macro Assembler for MS-DOS, versions 5.0, 5.1, and 5.1a
• Microsoft Macro Assembler for OS/2, versions 5.1 and 5.1a

SUMMARY

The ".286" and ".386" operands do not allow the following to assemble:

   SMSW, SGDT, SIDT, SLDT, VERR, and VERW

MORE INFORMATION

Page 412 (section 20.3) of the "Microsoft Macro Assembler Programmer's Guide" is incorrect in saying that these instructions require "privileged mode." Also, SMSW is spelled incorrectly (as "SMCW"). 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 "80286 and 80287 Programmer's Reference Manual" for more information.

The following is a sample program:

........................................................................ ; The following program demonstrates : dosseg .286 .model large .data

table   dw 64 dup (?)

        SMSW ax
        SGDT table
        SIDT table
        SLDT ax
        VERR ax
        VERW ax

        end start

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