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AMD64 Technology 24594 Rev. 3.10 February 2005Mnemonic Opcode DescriptionJMP FAR mem16:16 FF /5JMP FAR mem16:32 FF /5Far jump indirect, with the target specified by a far pointer inmemory.Far jump indirect, with the target specified by a far pointer inmemory.Action// Far jumps (JMPF)// See “Pseudocode Definitions” on page 49.JMPF_START:IF (REAL_MODE)JMPF_REAL_OR_VIRTUALELSIF (PROTECTED_MODE)JMPF_PROTECTEDELSE // (VIRTUAL_MODE)JMPF_REAL_OR_VIRTUALJMPF_REAL_OR_VIRTUAL:IF (OPCODE = jmpf [mem]) //JMPF Indirect{temp_RIP = READ_MEM.z [mem]temp_CS = READ_MEM.w [mem+Z]}ELSE // (OPCODE = jmpf direct){temp_RIP = z-sized offset specified in the instruction,zero-extended to 64 bitstemp_CS = selector specified in the instruction}IF (temp_RIP>CS.limit)EXCEPTION [#GP(0)]CS.sel = temp_CSCS.base = temp_CS SHL 4RIP = temp_RIPEXITJMPF_PROTECTED:IF (OPCODE = jmpf [mem]) // JMPF Indirect{temp_offset = READ_MEM.z [mem]temp_sel = READ_MEM.w [mem+Z]174 JMP (Far)
24594 Rev. 3.10 February 2005 AMD64 Technology}ELSE // (OPCODE = jmpf direct){IF (64BIT_MODE)EXCEPTION [#UD]// ’jmpf direct’ is illegal in 64-bit mode}temp_offset = z-sized offset specified in the instruction,zero-extended to 64 bitstemp_sel = selector specified in the instructiontemp_desc = READ_DESCRIPTOR (temp_sel, cs_chk)// read descriptor, perform protection <strong>and</strong> type checksIF (temp_desc.attr.type = ’available_tss’)TASK_SWITCH // using temp_sel as the target tss selectorELSIF (temp_desc.attr.type = ’taskgate’)TASK_SWITCH // using the tss selector in the task gate as the// target tssELSIF (temp_desc.attr.type = ’code’)// if the selector refers to a code descriptor, then// the offset we read is the target RIP{temp_RIP = temp_offsetCS = temp_descIF ((!64BIT_MODE) && (temp_RIP > CS.limit))// temp_RIP can’t be non-canonical because// it’s a 16- or 32-bit offset, zero-extended to 64 bits{EXCEPTION [#GP(0)]}RIP = temp_RIPEXIT}ELSE{// (temp_desc.attr.type = ’callgate’)// if the selector refers to a call gate, then// the target CS <strong>and</strong> RIP both come from the call gatetemp_RIP = temp_desc.offsetIF (LONG_MODE){// in long mode, we need to read the 2nd half of a 16-byte call-gate// from the gdt/ldt to get the upper 32 bits of the target RIPtemp_upper = READ_MEM.q [temp_sel+8]IF (temp_upper’s extended attribute bits != 0)EXCEPTION [#GP(temp_sel)] // Make sure the extended// attribute bits are all zero.temp_RIP = tempRIP + (temp_upper SHL 32)JMP (Far) 175
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