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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)： | 12/16頁(yè) |
| 文件大?。?/td> | 341K |
| 代理商： | 21086 |
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SYSCALL/SYSRET Target Address Register (STAR–MSR C000_0081h)
SYSCALL and SYSRET Instruction Specification
21086C/0—May 1998
SYSCALL/SYSRET Target Address Register
(STAR–MSR C000_0081h)
The SYSCALL/SYSRET Target Address Register (STAR)
contains the target EIP address used by the SYSCALL
instruction and the 16-bit code and stack segment selector
bases used by the SYSCALL and SYSRET instructions. Figure 1
shows the format of the STAR register, and Table 1 defines the
function of each bit of the STAR register.
Figure 1. SYSCALL/SYSRET Target Address Register (STAR)
31
0
63
Target EIP Address
32
47
48
SYSCALL CS Selector and SS
Selector Base
SYSRET CS Selector and SS
Selector Base
Table 1.
SYSCALL/SYSRET Target Address Register (STAR) Definition
Bit
Description
R/W
Function
63–48
SYSRET CS and SS Selector Base
R/W
During the SYSRET instruction, this field is copied into the CS
register and the contents of this field, plus 1000b, are copied
into the SS register.
During the SYSCALL instruction, this field is copied into the
CS register and the contents of this field, plus 1000b, are
copied into the SS register.
During the SYSCALL instruction, this address is copied into
the EIP and points to the new starting address
47–32
SYSCALL CS and SS Selector Base
R/W
31–0
Target EIP Address
R/W
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