DOCERR: Documentation Error on the LGDT Instruction (34375)
The information in this article applies to:
- Microsoft Macro Assembler (MASM) 5.1
This article was previously published under Q34375 SUMMARY
The "Microsoft Macro Assembler 5.10 Reference Guide" states that
the LGDT instruction only takes a memory 64 operand while the Intel
manual states the LGDT instruction takes a memory 48 operand.
The MASM Reference is incorrect. The correct operand size is memory
48. These instructions load essentially a 2-field structure whose
total size is 48 bits. The first two bytes are the limit field and the
last four bytes are the base field. This can be defined using the DF
directive, or by defining a structure as described.
| Modification Type: | Major | Last Reviewed: | 10/29/2003 |
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| Keywords: | KB34375 |
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