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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)： | 13/16頁(yè) |
| 文件大小： | 341K |
| 代理商： | 21086 |
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SYSCALL
7
21086C/0—May 1998
SYSCALL and SYSRET Instruction Specification
SYSCALL
mnemonic
opcode
description
SYSCALL
0F 05h
Call operating system
Privilege:
Registers Affected:
Flags Affected:
Machine State Affected: CPL, CS (base, limit, attr), SS (base, limit, attr)
Exceptions Generated:
Virtual
8086
Invalid opcode (6)
X
X
None
ECX, EIP, CS, SS
IF, VM
The SYSCALL instruction provides a fast method for transferring control to a fixed
entry point in an operating system.
The EIP register is copied into the
ECX register. Bits [31–0] of the 64-bit
SYSCALL/SYSRET Target Address Register (STAR) are copied into the EIP register.
(The STAR register is Model-Specific Register C000_0081h.)
The IF and VM flags are set to 0 in order to disable interrupts and force the processor
out of Virtual-8086 mode.
New selectors are loaded without any checking performed as follows:
I
Bits [47–32] of the STAR register specify the selector that is copied into the CS
register.
Bits [47–32]+1000b of the STAR register specify the selector that is copied into
the SS register.
Note:
This effectively increments the index field of the CS selector such that the
resultant SS selector points to the next descriptor in a descriptor table, after the
CS descriptor.
I
The CS and SS registers should not be modified by the operating system between the
execution of the SYSCALL instruction and its corresponding SYSRET instruction.
The CPL is set to 0 regardless of the value of bits [33–32] of the STAR register. There
are no permission checks based on the CPL, Real mode, or Virtual-8086 mode.
Exception
Real
Protected Description
X
The System Call Extension bit (SCE) of the Extended Feature Enable Register
(EFER) is set to 0. (The EFER register is MSR C000_0080h.)
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