Intel 64 and IA-32 Architectures Software Developers Manual Volume 2A, Instruction Set Reference, A-M

3-474 Vol. 2
INSTRUCTION SET REFERENCE, A-M
IF StackAddress is non-canonical
THEN #SS(0);
FI;
FI;
IF instruction pointer is not within code segment limits
THEN #GP(0); FI;
tempEFLAGS ← EFLAGS;
VM ← 0;
TF ← 0;
RF ← 0;
NT ← 0;
IF service through interrupt gate
THEN IF
= 0; FI;
TempSS ← SS;
TempESP ← ESP;
SS:ESP ← TSS(SS0:ESP0); (* Change to level 0 stack segment *)
(* Following pushes are 16 bits for 16-bit gate and 32 bits for 32-bit gates;
Segment selector pushes in 32-bit mode are padded to two words *)
Push(GS);
Push(FS);
Push(DS);
Push(ES);
Push(TempSS);
Push(TempESP);
Push(TempEFlags);
Push(CS);
Push(EIP);
GS ← 0; (* Segment registers NULLified, invalid in protected mode *)
FS ← 0;
DS ← 0;
ES ← 0;
CS ← Gate(CS);
IF OperandSize
= 32
THEN
EIP ← Gate(instruction pointer);
ELSE (* OperandSize is 16 *)
EIP ← Gate(instruction pointer) AND 0000FFFFH;
FI;
(* Start execution of new routine in Protected Mode *)
END;
INTRA-PRIVILEGE-LEVEL-INTERRUPT:
(* PE
= 1, DPL = CPL or conforming segment *)
IF 32-bit gate and IA32_EFER.LMA = 0