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PROTECTION
Table
7-4. Inter-Level Return Checks
Type
of
Check Exception·
Error Code
SP is not within Segment Limit
SF
0
SP + N + 7 is not in Segment
Limit·
SF
0
RPL
of
Return CS is Greater than CPL
GP
Return
CS
id
Return
CS
Selector is not null
GP
Return
CS
id
Return
CS
segment is within Descriptor Table Limit
GP
Return
CS
id
Return
CS
Descriptor is a Code Segment
GP
Return
CS
id
Return
CS
Segment is Present
NP
Return
CS
id
DPL
of
Return Non-Conforming Code Segment
~
RPL
of
CS
GP
Return
CS
id
55
Selector at
SP
+ N + 6 is not Null
SF
Return
55
id
55
Selector at
SP
+ N + 6 is within Descriptor Table Limit
SF
Return
55
id
55
Descriptor is Writable Data Segment
SF
Return
55
id
55
Segment is Present
SF
Return
55
id
55
Segment DPL = RPL
of
CS
SF
Return
55
id
'SF
= Stack Fault,
GP
= General Protection Exception,
NP
= Not-Present Exception
7-22