3-512 Vol. 2A JMP—Jump
INSTRUCTION SET REFERENCE, A-M
FI;
IF far jump and (PE
= 0 or (PE = 1 AND VM = 1)) (* Real-address or virtual-8086 mode *)
THEN
tempEIP ← DEST(Offset); (* DEST is ptr16:32 or [m16:32] *)
IF tempEIP is beyond code segment limit
THEN #GP(0); FI;
CS ← DEST(segment selector); (* DEST is ptr16:32 or [m16:32] *)
IF OperandSize
= 32
THEN
EIP ← tempEIP; (* DEST is ptr16:32 or [m16:32] *)
ELSE (* OperandSize
= 16 *)
EIP ← tempEIP AND 0000FFFFH; (* Clear upper 16 bits *)
FI;
FI;
IF far jump and (PE
= 1 and VM = 0)
(* IA-32e mode or protected mode, not virtual-8086 mode *)
THEN
IF effective address in the CS, DS, ES, FS, GS, or SS segment is illegal
or segment selector in target operand NULL
THEN #GP(0); FI;
IF segment selector index not within descriptor table limits
THEN #GP(new selector); FI;
Read type and access rights of segment descriptor;
IF (EFER.LMA
= 0)
THEN
IF segment type is not a conforming or nonconforming code
segment, call gate, task gate, or TSS
THEN #GP(segment selector); FI;
ELSE
IF segment type is not a conforming or nonconforming code segment
call gate
THEN #GP(segment selector); FI;
FI;
Depending on type and access rights:
GO TO CONFORMING-CODE-SEGMENT;
GO TO NONCONFORMING-CODE-SEGMENT;
GO TO CALL-GATE;
GO TO TASK-GATE;
GO TO TASK-STATE-SEGMENT;
ELSE
#GP(segment selector);
FI;
CONFORMING-CODE-SEGMENT:
IF L-Bit
= 1 and D-BIT = 1 and IA32_EFER.LMA = 1
