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3-492 Vol. 2A IRET/IRETD—Interrupt Return
INSTRUCTION SET REFERENCE, A-M
EFLAGS ← (tempEFLAGS AND 257FD5H) OR (EFLAGS AND 1A0000H);
ELSE (* OperandSize
= 16 *)
IF top 6 bytes of stack are not within stack limits
THEN #SS; FI;
EIP ← Pop(); (* 16-bit pop; clear upper 16 bits *)
CS ← Pop(); (* 16-bit pop *)
EFLAGS[15:0] ← Pop();
FI;
END;
PROTECTED-MODE:
IF VM
= 1 (* Virtual-8086 mode: PE = 1, VM = 1 *)
THEN
GOTO RETURN-FROM-VIRTUAL-8086-MODE; (* PE
= 1, VM = 1 *)
FI;
IF NT = 1
THEN
GOTO TASK-RETURN; (* PE = 1, VM = 0, NT = 1 *)
FI;
IF OperandSize = 32
THEN
IF top 12 bytes of stack not within stack limits
THEN #SS(0); FI;
tempEIP ← Pop();
tempCS
← Pop();
tempEFLAGS
← Pop();
ELSE (* OperandSize = 16 *)
IF top 6 bytes of stack are not within stack limits
THEN #SS(0); FI;
tempEIP ← Pop();
tempCS
← Pop();
tempEFLAGS
← Pop();
tempEIP
← tempEIP AND FFFFH;
tempEFLAGS
← tempEFLAGS AND FFFFH;
FI;
IF tempEFLAGS(VM)
= 1 and CPL = 0
THEN
GOTO RETURN-TO-VIRTUAL-8086-MODE;
ELSE
GOTO PROTECTED-MODE-RETURN;
FI;
IA-32e-MODE:
IF NT = 1
THEN #GP(0);