Intel ARCHITECTURE IA-32 User Manual Page 223

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Vol. 3A 5-47
INTERRUPT AND EXCEPTION HANDLING
Interrupt 13—General Protection Exception (#GP)
Exception Class Fault.
Description
Indicates that the processor detected one of a class of protection violations called “general-
protection violations.” The conditions that cause this exception to be generated comprise all the
protection violations that do not cause other exceptions to be generated (such as, invalid-TSS,
segment-not-present, stack-fault, or page-fault exceptions). The following conditions cause
general-protection exceptions to be generated:
Exceeding the segment limit when accessing the CS, DS, ES, FS, or GS segments.
Exceeding the segment limit when referencing a descriptor table (except during a task
switch or a stack switch).
Transferring execution to a segment that is not executable.
Writing to a code segment or a read-only data segment.
Reading from an execute-only code segment.
Loading the SS register with a segment selector for a read-only segment (unless the
selector comes from a TSS during a task switch, in which case an invalid-TSS exception
occurs).
Loading the SS, DS, ES, FS, or GS register with a segment selector for a system segment.
Loading the DS, ES, FS, or GS register with a segment selector for an execute-only code
segment.
Loading the SS register with the segment selector of an executable segment or a null
segment selector.
Loading the CS register with a segment selector for a data segment or a null segment
selector.
Accessing memory using the DS, ES, FS, or GS register when it contains a null segment
selector.
Switching to a busy task during a call or jump to a TSS.
Using a segment selector on a non-IRET task switch that points to a TSS descriptor in the
current LDT. TSS descriptors can only reside in the GDT. This condition causes a #TS
exception during an IRET task switch.
Violating any of the privilege rules described in Chapter 4, “Protection.”
Exceeding the instruction length limit of 15 bytes (this only can occur when redundant
prefixes are placed before an instruction).
Loading the CR0 register with a set PG flag (paging enabled) and a clear PE flag
(protection disabled).
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