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System, device and method of authority inspection for memory access operation

A technology for operating authority and checking device, which is applied to computer security devices, instruments, digital data authentication, etc., can solve the problem of inability to realize access authority checking and other problems, and achieves advantages of popularization and application, simple structure of the system and device, and realization of low cost effect

Inactive Publication Date: 2010-05-12
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, at present, there is no technology explicitly used to check the permission of the memory access operation under the segment protection mechanism, and it is impossible to realize the permission check of the memory access operation under the segment protection mechanism

Method used

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  • System, device and method of authority inspection for memory access operation
  • System, device and method of authority inspection for memory access operation
  • System, device and method of authority inspection for memory access operation

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Embodiment Construction

[0067] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0068] The core content of the present invention is: by translating memory access instructions into microcode sequences, and distinguishing the type of memory access instructions, whether the segment selector of special memory access instructions, the type of segment descriptor, the privilege level of the segment are legal and Check whether the address of the ordinary memory access instruction is out of bounds, and realize the authority check for the memory access operation.

[0069] When translating the above-mentioned memory access instruction into a microcode sequence, because the segment start address, segment boundary and segment attributes contained in the ordinary memory access instruction segment descriptor are sto...

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Abstract

The invention discloses an authority limit check system, device and method for accessing and saving operation under the sectionalized protection mechanism in the complicate instruction set computer sectionalized protection mechanism technique field. The method comprises the following steps: A, judging accessing and saving instruction type of receiving self accessing and saving instruction launching device by the accessing and saving operation authority limit check device, proceeding the procedure B if the accessing and saving instruction is the special accessing and saving instruction, proceeding the procedure C if not; B, checking if the field selector type, the segment descriptor word type and the field franchise of the special accessing and saving instruction is legal by the accessing and saving operation authority limit check device, ending the check if all are legal, proceeding the procedure D if any one isn' t legal; D, transferring the exceptional signal to the exceptional dealing device by the accessing and saving operation limit check device. The invention achieves the authority limit check for accessing and saving operation.

Description

technical field [0001] The present invention relates to the technical field of segment protection mechanism of complex instruction set computers, in particular to a system, device and method for performing authority checking on memory access operations under the segment protection mechanism. Background technique [0002] A computer based on a complex instruction set (Complex Instruction Set Computer, CISC) refers to a computer based on a microprogram and having a complex instruction system, and generally can have multiple memory access processing modes. For example, the X86-based processor 80386 has three memory access processing modes: real address mode, protected virtual address mode, and virtual 8086 mode. Among them, the protected virtual address mode is the most commonly used memory access processing mode of 80386. This mode introduces the concept of virtual memory. The virtual memory capacity is up to 64TB, and the physical memory capacity accessible by the CPU is 4GB....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/00G06F21/44
Inventor 刘磊袁楠范东睿
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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