24531904_j

INT n/INTO/INT 3—Call to Interrupt Procedure ( 続き )
IF 32-bit gate
THEN
IF new stack does not have room for 40 bytes (error code pushed)
OR 36 bytes (no error code pushed);
THEN #SS(segment selector + EXT);
FI;
ELSE (* 16-bit gate *)
IF new stack does not have room for 20 bytes (error code pushed)
OR 18 bytes (no error code pushed);
THEN #SS(segment selector + EXT);
FI;
FI;
IF instruction pointer is not within code segment limits THEN #GP(0); FI;
IF CR4.VME = 0
THEN
IF IOPL=3
THEN
IF Gate DPL = 3
THEN (*CPL=3, VM=1, IOPL=3, VME=0, gate DPL=3)
IF Target CPL != 0
THEN #GP(0);
ELSE Goto VM86_INTERURPT_TO_PRIV0;
FI;
ELSE (*Gate DPL < 3*)
#GP(0);
FI;
ELSE (*IOPL < 3*)
#GP(0);
FI;
ELSE (*VME = 1*)
(*Check whether interrupt is directed for INT n instruction only,
(*executes virtual 8086 interupt, protected mode interrupt or faults*)
Ptr