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| 型號(hào)： | 21086 |
| 英文描述： | SYSCALL and SYSRET Instruction Specification? 341KB (PDF) |
| 中文描述： | 系統(tǒng)調(diào)用和SYSRET指令規(guī)范？ 341KB（PDF格式） |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 341K |
| 代理商： | 21086 |
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4
New Method
SYSCALL and SYSRET Instruction Specification
21086C/0—May 1998
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The Descriptor Privilege Level of the call gate must be
greater than or equal to the Current Privilege Level. If it is
not, a General Protection Fault occurs.
The Stack Segment selector must not be a NULL selector. If
the selector is NULL, an Invalid Task State Segment
Exception occurs.
The Stack Segment selector must be able to index within the
limits of the descriptor table. If the index is not within these
limits, an Invalid Task State Segment Exception occurs.
The Descriptor Privilege Level of the Stack Segment must
be equal to the Descriptor Privilege Level of the Code
Segment. If it is not, an Invalid Task State Segment
Exception occurs.
The Requestor Privilege Level of the Stack Segment must be
equal to the Descriptor Privilege Level of the Code
Segment. If it is not, an Invalid Task State Segment
Exception occurs.
The stack created by the call must be large enough to
accommodate a predetermined number of bytes. If not, a
Stack Fault Exception occurs.
The Stack Segment must be present. If not, a Stack Fault
Exception occurs.
The descriptor of the Stack Segment must define the data
segment as writeable. If not, an Invalid Task State Segment
Exception occurs.
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This list is an example of some of the checks that must occur. In
addition, there are other checks that involve the Task State
Segment.
New Method
The SYSCALL and SYSRET instructions are ideally suited for
an operating system with a flat memory model (such as
Windows NT) where segmentation is disregarded by making all
segments 4 Gbytes (base=0 and limit =4 Gbytes).
By making the assumption that the operating system design is
flat, calls and returns can be greatly simplified. Such an
assumption also allows for greater security and reliability by
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