DOCERR: Encoding for LTR Instruction Is IncorrectLast reviewed: November 3, 1994Article ID: Q72706 |
The information in this article applies to:
SUMMARYThe 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/mHowever, this is the actual encoding for LTR:
00001111 00000000 mod,011,r/m MORE INFORMATIONIf 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 task0DBh 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 taskmain ENDP END
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Additional reference words: 5.10 5.10a 6.00 6.00a 6.00b
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