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AMD64 Technology 24594 Rev. 3.10 February 2005VERWVerify Segment for WritesVerifies whether a data segment specified by the segment selector in the 16-bitregister or memory operand is writable from the current privilege level. The zero flag(ZF) is set to 1 if the specified segment is writable. Otherwise, ZF is cleared.A segment is writable if all of the following apply:• the selector is not a null selector.• the descriptor is within the GDT or LDT limit.• the segment is a writable data segment.• the descriptor DPL is greater than or equal to both the CPL and RPL.The processor does not recognize the VERW instruction in real or virtual-8086 mode.Mnemonic Opcode DescriptionVERW reg/mem16 0F 00 /5 Set the zero flag (ZF) to 1 if the segment selected canbe written.Related InstructionsARPL, LAR, LSL, VERRrFLAGS 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 cleared to zero is M (modified). Unaffected flags are blank. Undefinedflags are U.M370 VERW
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,#GPXA memory address exceeded a data segment limit or was noncanonical.X A null data segment was used to access memory.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.VERW 371
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