x86 Opcode SYSEXIT

Opcode SYSEXIT

CPU: Intel Pentium II
Type of Instruction: Privelege (CPL =0)

Instruction: SYSRET

Description:

if CR.0.PE == 0 then #GP(0);
if SYSENTER_CS_MSR == 0 then #GP(0);

EFLAGS.VM <- 0;
EFLAGS.IF <- 0;

CS.SEL <- SYSENTER_CS_MSR + 16;
CPL <- 0;
CS.BASE <- 0;
CS.LIMIT <- 0xffff;
CS.ATTR.G <- 1;
CS.ATTR.S <- 1;
CS.ATTR.TYPE <- 1011b;
CS.ATTR.D <- 1;
CS.ATTR.DPL <- 0;
CS.RPL <- 0;
CS.ATTR.P <- 1;

SS.SEL <- CS.SEL+8;
SS.BASE <- 0;
SS.LIMIT <- 0xffff;
SS.ATTR.G <- 1;
SS.ATTR.S <- 1;
SS.ATTR.TYPE <- 0011b;
SS.ATTR.D <- 1;
SS.ATTR.DPL <- 0;
SS.RPL <- 0;
SS.ATTR.P <- 1;

ESP <- SYSENTER_ESP_MSR;
EIP <- SYSENTER_EIP_MSR;

Note: See SYSENTER for more Info.

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COP & Times:

SYSEXIT 0FH 35H
P6: n/a