CN114398029A - Operating system based on C language virtual machine - Google Patents

Abstract

The invention provides an operating system based on a C language virtual machine, which comprises an application programming interface layer, a virtual machine layer and a global platform management layer; the application programming interface layer is used for providing a system standard library function corresponding to an application programming interface for the C language application program; the virtual machine layer is used for providing a runtime environment and a virtual machine interpreter function for the C language application program so as to realize the corresponding C language application program function; the global platform management layer is used for downloading a downloading script corresponding to a target binary file of the C language application program and instantiating and installing the C language application program. The operating system supports downloading, installation and operation of the C language application program, guarantees the performance requirement of the C language application program, and meets the requirement that the C language application program can be executed in a cross-platform mode.

Description

Operating system based on C language virtual machine

technical field

The invention relates to the field of smart card virtual machines, in particular to an operating system based on a C language virtual machine.

Background technique

At present, in the field of smart cards, in order to facilitate the migration of applications between platforms and to simplify the development of upper-layer applications, a virtual machine is generally used to shield the differences in the underlying platforms. In the prior art, generally based on a smart card hardware system, a JavaCard-based virtual machine is constructed by means of software to support the downloading, installation and running of Java programs.

However, the existing operating system has the following problems: on the one hand, the Java virtual machine in the existing operating system is developed by a foreign company, so the existing operating system does not have domestic independent intellectual property rights; on the other hand, the Java virtual machine in the existing operating system The machine is an object-oriented method, and its execution speed is relatively slow, so that the performance of the application program in the existing operating system cannot reach the best effect when running on some platforms.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide an operating system based on a C language virtual machine, aiming to solve the problem of the lack of a C language virtual machine-based operating system with higher performance and more generality for users in the embedded development in the prior art. Technical issues with the operating system.

The present invention provides an operating system based on a C language virtual machine, the operating system based on the C language virtual machine includes an application programming interface layer, a virtual machine layer and a global platform management layer; the application programming interface layer is used for C language The application program provides the system standard library function corresponding to the application programming interface; the virtual machine layer is used to provide the C language application program with a runtime environment and virtual machine interpreter functions, so as to realize the corresponding C language application program function; the global platform The management layer is used to download the download script corresponding to the target binary file of the C language application, and instantiate the installation of the C language application.

Optionally, the virtual machine layer is composed of a virtual machine stack, a virtual machine bytecode, a runtime data heap, and a virtual machine interpreter.

Optionally, the virtual machine stack is used to store function parameters, variables, and operation caches of the C language application.

Optionally, the runtime data heap is used for storing virtual data sets of local arrays and structure variables of the C language application.

Optionally, the virtual machine bytecode includes a preset number of variables, functions, and pseudo-assembly bytecodes corresponding to expressions of the C language application.

Optionally, the virtual machine interpreter is used to obtain, parse and execute the implementation function of the bytecode in a loop, so as to realize the function of the C language application program corresponding to the bytecode.

Optionally, the operating system based on the C language virtual machine is used to download, install and run a C language application program, wherein the code written in the C language application program includes C language variables, functions, expressions and applications. The bytecode of the programming interface.

Optionally, in the process of compiling the C language application, the functions, variables and expressions corresponding to the C language application are compiled through the front end to generate a syntax tree; the syntax tree is based on the defined virtual machine bytecodes. Backend compilation is performed to generate the target binary.

Optionally, the global platform management layer is used for:

Parse each component information in the structure of the target binary file of the C language application program corresponding to the download script;

The parts that need to be linked in each component are linked based on the existing data in the operating system.

Optionally, the operating system based on the C language virtual machine further includes a chip hardware layer, a hardware abstraction layer, and a core layer; the chip hardware layer is composed of chip hardware, a firmware library and an algorithm library; the hardware abstraction layer is used for The firmware library and algorithm library of the chip hardware layer are abstractly encapsulated to provide a unified basic function interface for the operating system; the core layer is used for module encapsulation of the hardware abstraction layer, using the hardware abstraction layer provided by the The unified basic function interface of the operating system can realize the basic functions of the application programming interface layer, the virtual machine layer and the global platform management layer in the operating system.

The present invention provides an operating system based on a C language virtual machine, the operating system based on the C language virtual machine includes an application programming interface layer, a virtual machine layer and a global platform management layer; the application programming interface layer is used for C language The application program provides the system standard library function corresponding to the application programming interface; the virtual machine layer is used to provide the C language application program with a runtime environment and virtual machine interpreter functions, so as to realize the corresponding C language application program function; the global platform The management layer is used to download the download script corresponding to the target binary file of the C language application, and instantiate the installation of the C language application. The present invention provides a C language virtual machine-based operating system with higher performance and more generality for users. The operating system supports the downloading, installation and running of C language application programs, while ensuring the performance requirements of C language application programs. At the same time, it satisfies the requirement that C language applications can be executed across platforms.

Description of drawings

FIG. 1 is a hierarchical schematic diagram of an operating system based on a C language virtual machine involved in an embodiment of the present invention.

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The embodiment of the present invention provides an operating system based on a C language virtual machine.

Referring to FIG. 1 , FIG. 1 is a hierarchical schematic diagram of an embodiment of an operating system based on a C language virtual machine of the present invention.

In an embodiment of the operating system based on the C language virtual machine of the present invention, the operating system based on the C language virtual machine includes an application programming interface layer, a virtual machine layer and a global platform management layer; the application programming interface layer is used for The C language application program provides system standard library functions corresponding to the application programming interface; the virtual machine layer is used to provide the C language application program with a runtime environment and virtual machine interpreter functions to realize the corresponding C language application program functions; the The global platform management layer is used to download the download script corresponding to the target binary file of the C language application, and instantiate the installation of the C language application.

In this embodiment, the operating system based on the C language virtual machine includes an application programming interface layer, a virtual machine layer and a global platform management layer.

Wherein, the application programming interface layer is used to provide system standard library functions corresponding to the application programming interface for C language applications. A C language application is an executable program written by the developer in accordance with the C language rules and in combination with the application programming interface provided by the operating system. When the compiler writes the code file of the C language application, the corresponding system standard library function of the application programming interface in the written code file is defined by the application programming interface layer of the operating system. When the C language application program is running, the corresponding system standard library function of the application programming interface can be directly called to realize the corresponding function.

The virtual machine layer is used to provide a runtime environment and virtual machine interpreter functions for C language applications, so as to realize corresponding C language application functions. The virtual machine layer is the basis for the execution of C language applications on the operating system. When the compiler writes the C language application, the code file of the C language application needs to be correspondingly generated in combination with the virtual machine bytecode defined by the virtual machine layer. When running the C language application program, the memory read and write operations of the C language application program are performed through the runtime environment function provided by the virtual machine layer, wherein the runtime environment function includes firewall, life cycle management, logical channel Features such as management, atomic and transaction mechanisms. When running the C language application program, the bytecode of the C language application program is cyclically obtained through the virtual machine interpreter function provided by the virtual machine layer, and parses and executes the bytecode to realize the corresponding C language application program function.

The global platform management layer is used to download the download script corresponding to the target binary file of the C language application, and instantiate the installation of the C language application. The global platform management layer is mainly used for the content management of the operating system, including authentication, key management, data management, and the functions of downloading, installing and deleting C language applications. After the global platform management layer has written the target binary file of the realization code of the C language application program by the compiler, the target binary file is converted into the download script of the GP format by the conversion tool, and then the target binary file of the C language application program is converted. The corresponding download script is downloaded to the operating system through the global platform management layer, and the C language application is instantiated and installed. After the download and installation are completed, the space, data and registry information of the downloaded C language application program and the installed C language application program instance are managed through the global platform management layer of the operating system.

Further, in an embodiment, the virtual machine layer is composed of a virtual machine stack, a virtual machine bytecode, a runtime data heap, and a virtual machine interpreter.

In this embodiment, the virtual machine layer is composed of a virtual machine stack, a virtual machine bytecode, a runtime data heap, and a virtual machine interpreter. Wherein, each component of the above-mentioned virtual machine layer respectively meets the corresponding functional requirements of the C language application program when compiling and interpreting the runtime.

Further, in one embodiment, the virtual machine stack is used to store function parameters, variables, and operation caches of the C language application.

In this embodiment, the virtual machine stack is used to store function parameters, variables, and operation caches of the C language application. The virtual machine stack includes: a parameter stack, a variable stack, an operation stack, a method stack, and an exception stack. In the virtual machine stack, the parameter stack is used to transfer function parameters in the C language application code, the function parameters are pushed and input by the stack, and are popped from the stack when the function in the C language application code is executed. Obtaining; the variable stack is used to store the function local variables in the C language application code, wherein the arrays and structures in the function local variables exist in the form of object indexes; the operation stack is used to store the operation C language application program The intermediate result of the expression in the code; The method stack is used to save and restore the stack when the function in the C language application code is called; The exception stack is used to store the C language application captured by the Try\catch keyword Data when the program code executes abnormally.

Further, in one embodiment, the runtime data heap is used for storing virtual data sets of local arrays and structure variables of the C language application.

In this embodiment, the runtime data heap is used to store the virtual data sets of local arrays and structure variables of the C language application. The runtime data heap is a memory space corresponding to the user data storage area, and is mainly used to store the actual physical data of the corresponding function local arrays and structure variables in the C language application code, and to provide temporary storage space for its virtual objects. , the temporary storage space is a system RAM area, which is isolated from the virtual machine stack. Wherein, the object index of each local array or structure variable corresponding to the C language application code is in one-to-one correspondence with the address in the runtime data heap. The data content of the runtime data heap also includes member data and virtual data collection security maintenance data, such as context, size, type, and the like. The runtime data heap can unify the data structure in the variable stack, release the stack pressure of the virtual machine, and provide a unified virtual data set structure, ensure the data security of arrays and structure variables, and have excellent RAM data storage and access performance.

Further, in one embodiment, the virtual machine bytecode includes a preset number of pseudo-assembly bytecodes corresponding to variables, functions and expressions of the C language application.

In this embodiment, the virtual machine bytecode includes a preset number of variables, functions, and pseudo-assembly bytecodes corresponding to expressions of the C language application. C language applications can access the stored virtual machine bytecode. Among them, the preset number of pseudo-assembly bytecodes included in the virtual machine include, in terms of variables, global variables and local variables of basic types, arrays and structures, and application structures; in terms of functions, it includes performing C The calling function of the application programming interface of the system module corresponding to the language application program and the calling function of the common application method; in terms of expressions, it includes the conditional control statements, operation operator statements, exception catch statements and other statements corresponding to the C language application program.

Among them, the virtual machine bytecode adds some unique language features on the basis of the bytecode definition corresponding to the basic C language application. Unlike ordinary global variables in the storage area, the global variables modified with the const keyword are stored in the NVM storage area of the operating system. Second, add the SIO keyword modifier when the function is defined to distinguish whether the application function of the C language application program allows other C language application programs to access through the shared interface mechanism. A function decorated with SIO indicates that the application function is declared as a shared interface type, allowing other applications to access the function through the shared interface mechanism; functions without SIO decoration can only be used in this application module, and cannot be accessed by other applications. Third, the custom keyword type represents the special structure variable type defined in the application programming interface of the system module. The members of the structure variable are not visible to the outside world, and the C language application can access these variables through the application programming interface of the application programming interface layer. structure variable. Fourth, the exception capture mechanism supports the use of the try\catch keyword to capture exceptions in the C language application code, and the C language application program handles the exception after the capture.

Further, in an embodiment, the virtual machine interpreter is used to obtain, parse and execute the implementation functions of the bytecode in a loop, so as to realize the function of the C language application program corresponding to the bytecode.

In this embodiment, the virtual machine interpreter is used to cyclically obtain, parse and execute the implementation functions of the bytecode, so as to realize the function of the C language application program corresponding to the bytecode. Its specific action process is as follows: the virtual machine interpreter reads the bytecode data from the download script corresponding to the target binary file of the C language application, and then finds the code implementation function corresponding to the bytecode data, and calls the bytecode data. The implementation function of the code implements the function of the C language application program corresponding to the byte code.

Further, in one embodiment, the operating system based on the C language virtual machine is used to download, install and run a C language application program, wherein the code written in the C language application program includes variables, functions, expressions of the C language format and application programming interface bytecode.

In this embodiment, the operating system based on the C language virtual machine is used to download, install and run a C language application program, wherein the code written in the C language application program includes C language variables, functions, expressions and The bytecode of the application programming interface. The code written in the C language application program is obtained by compiling according to the defined virtual machine bytecode.

Further, in an embodiment, in the process of compiling the C language application, the functions, variables and expressions corresponding to the C language application are compiled through the front end to generate a syntax tree; the syntax tree is based on the defined virtual machine The bytecode is back-compiled to generate the target binary.

In this embodiment, in the process of compiling the C language application program, the functions, variables and expressions corresponding to the C language application program are compiled through the front end to generate a syntax tree; the syntax tree is based on the defined virtual machine bytes The code is back-end compiled to generate the target binary file. Wherein, the C language application program is divided into an application module, a reference module and a system module according to its purpose.

The target binary file of the application module is a set of code files that implement the runtime environment interface, and the operating system can access and call the runtime environment interface of the application module to execute the corresponding application function. The target binary file of the referenced module is a collection of code files that do not implement the runtime environment interface, the operating system cannot directly access the methods in the module, and the referenced module can only be called by the methods in the application module. The target binary file of the system module is a collection of code files containing various standard application programming interfaces. Application developers can directly call the methods in the system module during development. The application programming interface supported by the module is determined by the application programming interface layer in the operating system. supply;

The target binary files generated by application module compilation are .SC files and .SCCLIB files; the target binary files generated by reference module compilation are .SC files and .SCCLIB files; the system modules are generated as .SCCLIB files. Among them, the .SC file is an executable object file, and the compiler conversion tool can convert the binary file into a download script in GP format; the .SCCLIB file is a link file, which is used by the compiler to link and use when compiling the application module and the reference module. , no download script will be generated.

Further, in one embodiment, the global platform management layer is used for:

Parse each component information in the structure of the target binary file of the C language application program corresponding to the download script;

The parts that need to be linked in each component are linked based on the existing data in the operating system.

In this embodiment, the global platform management layer is used to, when receiving a download instruction in the standard GP format, parse each component information in the structure of the target binary file of the C language application corresponding to the download script; There is data linking the parts of each component that need to be linked. After the link is completed, when receiving the installation instruction in the standard GP format, the C language application program is instantiated and installed.

Further, in an embodiment, the operating system based on the C language virtual machine further includes a chip hardware layer, a hardware abstraction layer, and a core layer; the chip hardware layer is composed of chip hardware, a firmware library and an algorithm library; the hardware abstraction layer is composed of The core layer is used to abstractly encapsulate the firmware library and algorithm library of the chip hardware layer, and provide a unified basic function interface for the operating system; the core layer is used to perform module encapsulation on the hardware abstraction layer, using the hardware abstraction layer. The unified basic function interface provided by the layer to realize the basic functions of the application programming interface layer, the virtual machine layer and the global platform management layer in the operating system.

In this embodiment, the operating system based on the C language virtual machine further includes a chip hardware layer, a hardware abstraction layer, and a core layer.

Wherein, the chip hardware layer is composed of chip hardware, firmware library and algorithm library. The chip hardware layer is composed of the SE hardware of the operating system and the firmware library. Generally, the chip hardware included in the chip hardware layer is a chip that has passed security certification, and the chip hardware that has passed the security certification can ensure the hardware security function of the operating system.

The hardware abstraction layer is used to abstractly encapsulate the firmware library and the algorithm library of the chip hardware layer, and provide a unified basic function interface for the operating system. In the operating system based on the C language virtual machine, the hardware abstraction layer mainly provides the following basic function interfaces, for example: algorithm interfaces, such as DES\AES encryption and decryption functions, RSA encryption and decryption and key pair generation functions, ECC Encryption and decryption, signature verification and key pair generation function, sha1\sha2 information digest function, SM1\SM4\SM7 encryption and decryption function, SM2 encryption and decryption, signature verification and key pair generation function, SM3 information digest function, random generation function Data function; communication transceiver interface, such as ISO7816 protocol initialization, reception and transmission functions, ISO14443 protocol initialization, reception and transmission functions, SWP protocol initialization, reception and transmission functions, mifare protocol initialization, reception and transmission functions; system security Interfaces, such as chip security function initialization, system security storage interface, system data security verification interface.

The core layer is used to perform module encapsulation on the hardware abstraction layer, and use the unified basic function interface provided by the hardware abstraction layer to realize the application programming interface layer, the virtual machine layer and the global platform management layer in the operating system. basic skills. The core layer implements basic functions such as: algorithm encapsulation according to the application programming interface requirements of the C language application program, mainly according to the application programming interface requirements of the C language application program. The language application program provides algorithm functions of various computing modes; APDU command encapsulation, when receiving data, the command data received by different communication protocols is uniformly transmitted to the operating system in APDU format, and the APDU data is transmitted to the current communication protocol when sending data. The sending process; memory management, including NVM and RAM memory, mainly provides operating system memory allocation, recycling and recording functions; memory storage and access functions, mainly for NVM and RAM storage area memory read and write functions, including Transaction mechanism and ordinary read and write functions.

In this embodiment, an operating system based on a C language virtual machine is provided, and the C language virtual machine-based operating system includes an application programming interface layer, a virtual machine layer and a global platform management layer; the application programming interface layer is used for The system standard library function corresponding to the application programming interface is provided for the C language application; the virtual machine layer is used to provide the C language application with a runtime environment and virtual machine interpreter functions, so as to realize the corresponding C language application function; The global platform management layer is used to download the download script corresponding to the target binary file of the C language application, and instantiate the installation of the C language application. The present invention provides a C language virtual machine-based operating system with higher performance and more generality for users. The operating system supports the downloading, installation and running of C language application programs, while ensuring the performance requirements of C language application programs. At the same time, it satisfies the requirement that C language applications can be executed across platforms.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or system comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or system. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system that includes the element.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages or disadvantages of the embodiments.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on such understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products are stored in a storage medium (such as ROM/RAM) as described above. , magnetic disk, optical disk), including several instructions to make a terminal device execute the method described in each embodiment of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields , are similarly included in the scope of patent protection of the present invention.

Claims (10)

1. an operating system based on a C language virtual machine, is characterized in that: the described operating system based on the C language virtual machine comprises an application programming interface layer, a virtual machine layer and a global platform management layer; the application programming interface layer is used for The system standard library function corresponding to the application programming interface is provided for the C language application; the virtual machine layer is used to provide the C language application with a runtime environment and virtual machine interpreter functions, so as to realize the corresponding C language application function; The global platform management layer is used to download the download script corresponding to the target binary file of the C language application, and instantiate the installation of the C language application. 2 . The operating system based on a C language virtual machine according to claim 1 , wherein the virtual machine layer is composed of a virtual machine stack, a virtual machine bytecode, a runtime data heap, and a virtual machine interpreter. 3 . 3 . The operating system based on a C language virtual machine according to claim 2 , wherein the virtual machine stack is used to store function parameters, variables and operation buffers of the C language application program. 4 . 4 . The operating system based on a C language virtual machine according to claim 2 , wherein the runtime data heap is used for storing virtual data sets of local arrays and structure variables of C language application programs. 5 . 5. the operating system based on C language virtual machine as claimed in claim 2, is characterized in that: described virtual machine bytecode comprises the corresponding pseudo-assembly of the variable of the C language application program of preset number, function and expression bytecode. 6. the operating system based on C language virtual machine as claimed in claim 2, is characterized in that: described virtual machine interpreter is used for the realization function of circular acquisition, analysis and execution bytecode, to realize the corresponding C of bytecode Language app features. 7. The operating system based on the C language virtual machine as claimed in claim 1, wherein the operating system based on the C language virtual machine is used for C language application download, installation and running, wherein the C language The code written in the application contains C language variables, functions, expressions and bytecode of application programming interface. 8. the operating system based on C language virtual machine as claimed in claim 7, is characterized in that: in described C language application program compiling process, the function, variable and expression corresponding to described C language application program are passed through front end Compile to generate a syntax tree; the syntax tree is back-compiled according to the defined virtual machine bytecode to generate a target binary file. 9. The operating system based on C language virtual machine as claimed in claim 1, is characterized in that, described global platform management layer is used for: Parse each component information in the structure of the target binary file of the C language application program corresponding to the download script; The parts that need to be linked in each component are linked based on the existing data in the operating system. 10. The operating system based on the C language virtual machine as claimed in claim 1, wherein the operating system based on the C language virtual machine further comprises a chip hardware layer, a hardware abstraction layer and a core layer; the chip hardware layer It consists of chip hardware, firmware library and algorithm library; the hardware abstraction layer is used to abstractly encapsulate the firmware library and algorithm library of the chip hardware layer to provide a unified basic function interface for the operating system; the core layer is used for Module encapsulation is performed on the hardware abstraction layer, and the unified basic function interface provided by the hardware abstraction layer is used to realize the basic functions of the application programming interface layer, the virtual machine layer and the global platform management layer in the operating system.

Images