Microsoft KB Archive/72706

= DOCERR: Encoding for LTR Instruction Is Incorrect =

Article ID: 72706

Article Last Modified on 11/17/2003

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APPLIES TO


 * Microsoft Macro Assembler 5.1 Standard Edition
 * Microsoft Macro Assembler 5.1a
 * Microsoft Macro Assembler 6.0 Standard Edition
 * Microsoft Macro Assembler 6.0a
 * Microsoft Macro Assembler 6.0b

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This article was previously published under Q72706



SUMMARY
The LTR (load task register) instruction is documented incorrectly in the printed documentation for the Microsoft Macro Assembler (MASM) versions 5.1, and 5.1a and the online help for MASM versions 6.0, 6.0a, and 6.0b. The following is the documented encoding:   00001111 00000000 mod,001,r/m However, this is the actual encoding for LTR:   00001111 00000000 mod,011,r/m



MORE INFORMATION
If the sample code below is assembled and a source listing is generated, the following encoding is listed:   0000  0F 00 DB              ltr BX   0003  0F 00 1D 00000000 R   ltr task 0DBh evaluates to 11011011y, 1Dh evaluates to 00011101y.

Sample Code
; Assemble Options Needed: /c /Fl

.386p .MODEL small .STACK 4096

.DATA task dw ?

.CODE main PROC ltr BX  ltr task main ENDP END

Additional query words: 5.10 5.10a 6.00 6.00a 6.00b

Keywords: KB72706

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