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AMD64 Technology 24594 Rev. 3.10 February 2005When the operand size is 32 or 64 bits, access rights include the DPL and type as wellas the descriptor type (S field), segment present (P flag), available to system (AVLflag), default operation size (D/B flag), and granularity flags located in bytes 4–7 of thedescriptor. Before being loaded into the destination operand, the doubleword ismasked with 00FF_FF00H.In 64-bit mode, for both 32-bit and 64-bit operand sizes, 32-bit register results are zeroextendedto 64 bits.This instruction can only be executed in protected mode.Mnemonic Opcode DescriptionLAR reg16, reg/mem16 0F 02 /r Reads the GDT/LDT descriptor referenced by the 16-bit sourceoperand, masks the attributes with FF00h and saves the result in the16-bit destination register.LAR reg32, reg/mem16 0F 02 /r Reads the GDT/LDT descriptor referenced by the 16-bit sourceoperand, masks the attributes with 00FFFF00h and saves the result inthe 32-bit destination register.LAR reg64, reg/mem16 0F 02 /r Reads the GDT/LDT descriptor referenced by the 16-bit sourceoperand, masks the attributes with 00FFFF00h and saves the result inthe 64-bit destination register.Related InstructionsARPL, LSL, VERR, VERWrFLAGS AffectedID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CF21 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0Note: Bits 31–22, 15, 5, 3, and 1 are reserved. A flag set to one or zero is M (modified). Unaffected flags are blank. Undefined flagsare U.M316 LAR
24594 Rev. 3.10 February 2005 AMD64 TechnologyExceptionsException RealVirtual8086 Protected Cause of ExceptionInvalid opcode, #UD X X This instruction is only recognized in protected mode.Stack, #SS X A memory address exceeded the stack segment limit or was noncanonical.General protection, #GPX A memory address exceeded the data segment limit or was noncanonical.XA null data segment was used to reference memory.X The extended attribute bits of a system descriptor was not zero in64-bit mode.Page fault, #PF X A page fault resulted from the execution of the instruction.Alignment check, #AC X An unaligned memory reference was performed while alignmentchecking was enabled.LAR 317
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