ID Number: Q67439
5.00 5.10 | 5.10
MS-DOS | OS/2
docerr
Summary:
In the "Microsoft Macro Assembler 5.1 Reference" manual, a number of
instructions indicate that their operand size is a mem64 when they
should indicate an operand size of mem48. The instructions are
documented incorrectly as LGDT, LIDT, LLDT, SGDT, SIDT, and SLDT.
These instructions require the FWORD PTR operator and not the QWORD
PTR operator. If the QWORD PTR operator is used, the Microsoft Macro
Assembler (MASM) will generate the following warning:
warning A4057: illegal size for operand
These instructions are privileged 286 and 386 instructions that are
used to load and save the protected mode descriptor table registers.
These registers are only 6 bytes long, even though descriptor table
entries are normally 8 bytes.