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Vol. 2A 3-97
INSTRUCTION SET REFERENCE, A-M
CALL—Call Procedure
tempEIP ← DEST(Offset);
IF OperandSize
= 16
THEN tempEIP ← tempEIP AND 0000FFFFH; FI; (* Clear upper 16 bits *)
IF (EFER.LMA = 0 or target mode = Compatibility mode) and (tempEIP outside new code
segment limit)
THEN #GP(0); FI;
IF tempEIP is non-canonical
THEN #GP(0); FI;
IF OperandSize
= 32
THEN
Push(CS); (* Padded with 16 high-order bits *)
Push(EIP);
CS ← DEST(CodeSegmentSelector);
(* Segment descriptor information also loaded *)
CS(RPL) ← CPL;
EIP ← tempEIP;
ELSE
IF OperandSize = 16
THEN
Push(CS);
Push(IP);
CS ← DEST(CodeSegmentSelector);
(* Segment descriptor information also loaded *)
CS(RPL) ← CPL;
EIP ← tempEIP;
ELSE (* OperandSize = 64 *)
Push(CS); (* Padded with 48 high-order bits *)
Push(RIP);
CS ← DEST(CodeSegmentSelector);
(* Segment descriptor information also loaded *)
CS(RPL) ← CPL;
RIP ← tempEIP;
FI;
FI;
END;
CALL-GATE:
IF call gate (DPL < CPL) or (RPL > DPL)
THEN #GP(call gate selector); FI;
IF call gate not present
THEN #NP(call gate selector); FI;
IF call gate code-segment selector is NULL
THEN #GP(0); FI;
IF call gate code-segment selector index is outside descriptor table limits