Filter
Top Products
3-514 Vol. 2A JMP—Jump
INSTRUCTION SET REFERENCE, A-M
THEN #GP(0); FI;
IF call gate code-segment selector index outside descriptor table limits
THEN #GP(code segment selector); FI;
Read code segment descriptor;
IF code-segment segment descriptor does not indicate a code segment
or code-segment segment descriptor is conforming and DPL > CPL
or code-segment segment descriptor is non-conforming and DPL
≠ CPL
THEN #GP(code segment selector); FI;
IF IA32_EFER.LMA
= 1 and (code-segment descriptor is not a 64-bit code segment
or code-segment segment descriptor has both L-Bit and D-bit set)
THEN #GP(code segment selector); FI;
IF code segment is not present
THEN #NP(code-segment selector); FI;
IF instruction pointer is not within code-segment limit
THEN #GP(0); FI;
tempEIP ← DEST(Offset);
IF GateSize
= 16
THEN tempEIP ← tempEIP AND 0000FFFFH; FI;
IF (IA32_EFER.LMA
= 0 OR target mode = Compatibility mode) AND tempEIP
outside code segment limit
THEN #GP(0); FI
CS ← DEST[SegmentSelector); (* Segment descriptor information also loaded *)
CS(RPL) ← CPL;
EIP ← tempEIP;
END;
TASK-GATE:
IF task gate DPL < CPL
or task gate DPL < task gate segment-selector RPL
THEN #GP(task gate selector); FI;
IF task gate not present
THEN #NP(gate selector); FI;
Read the TSS segment selector in the task-gate descriptor;
IF TSS segment selector local/global bit is set to local
or index not within GDT limits
or TSS descriptor specifies that the TSS is busy
THEN #GP(TSS selector); FI;
IF TSS not present
THEN #NP(TSS selector); FI;
SWITCH-TASKS to TSS;
IF EIP not within code segment limit
THEN #GP(0); FI;
END;
TASK-STATE-SEGMENT:
IF TSS DPL < CPL