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AMD64 Technology 24594 Rev. 3.10 February 2005Mnemonic Opcode DescriptionCALL FAR pntr16:169A cdCALL FAR pntr16:329A cpCALL FAR mem16:16 FF /3CALL FAR mem16:32 FF /3Far call direct, with the target specified by a far pointer containedin the instruction. (Invalid in 64-bit mode.)Far call direct, with the target specified by a far pointer containedin the instruction. (Invalid in 64-bit mode.)Far call indirect, with the target specified by a far pointer inmemory.Far call indirect, with the target specified by a far pointer inmemory.Action// See “Pseudocode Definitions” on page 49.CALLF_START:IF (REAL_MODE)CALLF_REAL_OR_VIRTUALELSIF (PROTECTED_MODE)CALLF_PROTECTEDELSE // (VIRTUAL_MODE)CALLF_REAL_OR_VIRTUALCALLF_REAL_OR_VIRTUAL:IF (OPCODE = callf [mem]) // CALLF Indirect{temp_RIP = READ_MEM.z [mem]temp_CS = READ_MEM.w [mem+Z]}ELSE // (OPCODE = callf direct){temp_RIP = z-sized offset specified in the instructionzero-extended to 64 bitstemp_CS = selector specified in the instruction}PUSH.v old_CSPUSH.v next_RIPIF (temp_RIP>CS.limit)EXCEPTION [#GP(0)]CS.sel = temp_CSCS.base = temp_CS SHL 4RIP = temp_RIPEXIT90 CALL (Far)
24594 Rev. 3.10 February 2005 AMD64 TechnologyCALLF_PROTECTED:IF (OPCODE = callf [mem]) //CALLF Indirect{temp_offset = READ_MEM.z [mem]temp_sel = READ_MEM.w [mem+Z]}ELSE // (OPCODE = callf direct){IF (64BIT_MODE)EXCEPTION [#UD] // ’CALLF direct’ is illegal in 64-bit mode.temp_offset = z-sized offset specified in the instructionzero-extended to 64 bitstemp_sel = selector specified in the instruction}temp_desc = READ_DESCRIPTOR (temp_sel, cs_chk)IF (temp_desc.attr.type = ’available_tss’)TASK_SWITCH // Using temp_sel as the target TSS selector.ELSIF (temp_desc.attr.type = ’taskgate’)TASK_SWITCH // Using the TSS selector in the task gate// as the target TSS.ELSIF (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_descPUSH.v old_CSPUSH.v next_RIPIF ((!64BIT_MODE) && (temp_RIP > CS.limit))}ELSE{EXCEPTION [#GP(0)]RIP = temp_RIPEXIT// temp_RIP can’t be non-canonical because// it’s a 16- or 32-bit offset, zero-extended// to 64 bits.// (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 gate.IF (LONG_MODE)// The size of the gate controls the size of the stack pushes.V=8-byte// Long mode only uses 64-bit call gates, force 8-byte opsize.ELSIF (temp_desc.attr.type = ’callgate32’)V=4-byte// Legacy mode, using a 32-bit call-gate, force 4-byte opsize.CALL (Far) 91
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