CN1645339A - Debugging method for applied programm in simulator of embedded system - Google Patents
Debugging method for applied programm in simulator of embedded system Download PDFInfo
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Abstract
A method for debugging application program on simulator in embedded system includes fetching out core symbol file generated during compile of operation system to obtain process control block information of application program in simulator memory as result to obtain control ability of corresponding application program for realizing the debugging of application program operated in simulator and above operation system.
Description
Technical field
The present invention relates to the computer program debugging technology, particularly the method for debugging utility on embedded system simulator.
Background technology
Along with embedded device is popularized, personal digital assistant (PDA) for example, mobile phones etc. are based on the application emerge in multitude of portable mobile equipment.And the application program on the embedded device general all with the machine environment of target platform isomery under develop, can not under development environment, debug, and the simulation hardware equipment of the exploitation of embedded device assessment generally all compares expensive, and therefore debugging becomes the key factor that is restricting embedded software developing.
The Computer Systems Simulator technology is the process of carrying out by hardware characteristics and its instruction of simulated target framework computing machine in the computing machine of certain framework, thereby is implemented in the technology that fictionalizes many computing machines on the computing machine.Popular Computer Systems Simulator is for example: Bochs, the computing machine that can simulate many Intel 80 * 86 systems on the machine of multiple architecture, and Intel80 * 86 versions of operating systems such as operation Linux, freebsd; Armulator, the computing machine that can on the machine of Intel 80 * 86 architectures, simulate the ARM system, and the ARM of operation ucLinux transplants version etc.
Utilize the characteristics of Computer Systems Simulator, the debugging of carrying out embedded software on simulator becomes a solution that solves the embedded systems debugging problem, but existing debugging technique based on simulator usually can only the operating system of commissioning test on embedded system simulator, and powerless to the application program on the operating system, this has limited the space that plays a role based on the simulator debugging technique; Perhaps by extra operation debugger on operating system, gdb for example, if but on this operating system no available debugger (as ucLinux), then can't use; Perhaps the operation debugger is acted on behalf of on operating system, gdb server for example, operating system must realize network protocol stacks such as TCP/IP but the network that requires the simulator virtual support connects simultaneously, and these require many embedded OSs not satisfy, instant satisfied, also increase the program that simulator is carried out, influenced the simulator performance.
Process is the base unit that computer program is carried out, and also is the base unit of debugging.Essential information about process all is stored in the process control block (PCB) structure of operating system, comprises the unique identification for the treatment of debug procedures and the contextual information (state relevant with CPU comprises register, page table base, segment base etc.) of process.Thereby the key that sees through the operating system debugging application software on the simulator just is to obtain the process control block (PCB) information in the operating system memory space.
Summary of the invention
The object of the present invention is to provide a kind of on embedded system simulator the method for debugging utility.
The technical solution used in the present invention is:
1) the debugger user specifies and treats debugging utility process identification number in the operating system on simulator;
2) symbolic analysis load-on module, the kernel symbol table that generates when operating system is compiled carries out scanning analysis, obtain the memory address of process control block (PCB) structure example, and travel through all process control block (PCB) structure examples, obtain the memory address of the process control block (PCB) for the treatment of debugging utility according to the process identification number of appointment in the step 1), whether support the virtual address according to operating system, this memory address may be a virtual address, also may be physical address;
3) virtual memory access module, if operating system is supported virtual address mechanism, then this module realize with simulator on the same address translation algorithm of operating system that moves, according to 2) in the virtual address that obtains calculate physical address corresponding, if meet pairing page not in physical memory, then need to be loaded on internal memory with the piece at its place from the simulation files system number and with page or leaf, if the operating system of upper strata operation is not supported virtual address mechanism, then this step can be saved;
4) debugging interface module, this module is accepted the various debug commands from the program development personnel, delivers to the debugging proxy module, and the Debugging message that debugging proxy module acceptance instruction back produces is accepted and demonstration;
5) debugging proxy module, this module is received the debug command that debugging interface transmits, if debug command is for inserting breakpoint, it then is the break-poing instruction of definition format voluntarily with the modifying of order of purpose breakpoint address correspondence, the former instruction that is capped is saved together with breakpoint location, when virtual machine runs into this break-poing instruction, then shut down and wait for the debug command that sends from debugger; If debug command is on-the-spot query statement or on-the-spot modify instruction, then according to 2) in the process control block (PCB) that obtains canned data operate accordingly at the memory address that belongs to process or by the register of simulator simulation; If the former instruction recovery that debug command for continue carrying out, then will be preserved, allow the virtual machine state that resumes operation; If show process tabulation instruction, then call sign is analyzed load-on module according to 2) describedly obtain the memory address of process list data structure in kernel, and travel through this structure; If specify the debug procedures instruction, then in the data structure of a current debug procedures information of simulator internal maintenance.
The present invention compares the useful effect that has with technology: it is advantageous that the network support that does not need operating system, do not need to move extra debugger program, thereby avoided the problem of shortage debugger on the embedded OS; Simultaneously, this method is not carried out extra program on the operating system of virtual machine, has improved the performance of simulator, improves response speed.
Embodiment
In certain ARM simulator, realized the explanation of ARMv4 version command is carried out, simulated the AT91EV40 of Atmel company development board, can move ucLinux version 2 .0.0 thereon.Generating the kernel symbol file during this version ucLinux compiling is/boot/system.map.Program name to be debugged is assumed to be debuggedproc, and debugger is debugger, and simulator is called simon, has realized symbolic analysis load-on module, virtual memory access module, debugging proxy module in simulator.Comprised the debugging interface module simultaneously in the debugger client of other independent operating, the debugging proxy module of this module and simulator is carried out communication by socket, and communication format is followed GDB remote debugging agreement.
1) process list that obtains by the symbolic analysis load-on module of debugger debugger determines to treat the process ID of debugged program debuggedproc on destination OS, is assumed to be 1000.At this moment, debugger can be by attach 1000 instruction according in the technical scheme 1) described appointment process ID to be debugged.
2) symbolic analysis load-on module, the kernel symbol table system.map that generates when operating system is compiled carries out scanning analysis, obtain process control block (PCB) structural array task corresponding memory address, item in the task array is the process control block (PCB) structure, by traveling through all process control block (PCB) structure examples, according in the technical scheme 1) in the process identification number of appointment obtain the memory address of the process control block (PCB) for the treatment of debugging utility.Whether support the virtual address according to operating system, this memory address may be a virtual address, also may be physical address;
3) virtual memory access module, if operating system is supported virtual address mechanism, then this module realize with simulator on the same address translation algorithm of operating system that moves, according in the technical scheme 1) in the virtual address that obtains calculate physical address corresponding, if meet pairing page not in physical memory, then need further to resolve internal storage data structure in the process control block (PCB) structure and obtain the piece number at its place in simulation files system or swap file and page or leaf is loaded on internal memory; If the operating system of upper strata operation is not supported virtual address mechanism, then this step can be saved;
4) debugging interface module, this module is accepted the various debug commands (tabulate, specify debug procedures, check internal memory, revise internal memory, insert breakpoint, check breakpoint, delete breakpoint, check register, revise register, single step execution etc. as show process) from the program development personnel, requirement according to gdb remote debugging protocol format parses debug command and tuning parameter thereof and delivers to the debugging proxy module, and the feedback Debugging message that debugging proxy module acceptance instruction back produces is accepted and demonstration;
5) debugging proxy module, this module is received debug command and the tuning parameter thereof that debugging interface transmits, if debug command is for inserting breakpoint, it then is the break-poing instruction of definition format voluntarily with the modifying of order of purpose breakpoint address correspondence, the former instruction that is capped is saved together with breakpoint location, when virtual machine runs into this instruction, then shut down and wait for other debug command; If debug command is on-the-spot query statement or on-the-spot revises the class instruction, then according in the technical scheme 2) in the process control block (PCB) that obtains canned data operate accordingly at the memory address that belongs to process or by the register of simulator simulation; If the former instruction recovery that debug command for continue carrying out, then will be preserved, allow the virtual machine state that resumes operation.If show process tabulation instruction, then call sign is analyzed load-on module according in the technical scheme 2) describedly obtain the memory address of process list data structure in kernel, and travel through this structure.If specify the debug procedures instruction, then in the data structure of a current debug procedures information of simulator internal maintenance.
Use this method need under ucLinux, not move extra debugged program (for example GDB), do not require that also this ucLinux realizes ICP/IP protocol, reduced the performance loss that simulator is caused greatly when the instruction of these programs of parsing or agreement.
Claims (1)
1 one kinds of methods that are used in debugging utility on the embedded system simulator is characterized in that:
1) the debugger user specifies and treats debugging utility process identification number in the operating system on simulator;
2) symbolic analysis load-on module, the kernel symbol table that generates when operating system is compiled carries out scanning analysis, obtain the memory address of process control block (PCB) structure example, and travel through all process control block (PCB) structure examples, obtain the memory address of the process control block (PCB) for the treatment of debugging utility according to the process identification number of appointment in the step 1), whether support the virtual address according to operating system, this memory address may be a virtual address, also may be physical address;
3) virtual memory access module, if operating system is supported virtual address mechanism, then this module realize with simulator on the same address translation algorithm of operating system that moves, according to 2) in the virtual address that obtains calculate physical address corresponding, if meet pairing page not in physical memory, then need to be loaded on internal memory with the piece at its place from the simulation files system number and with page or leaf, if the operating system of upper strata operation is not supported virtual address mechanism, then this step can be saved;
4) debugging interface module, this module is accepted the various debug commands from the program development personnel, delivers to the debugging proxy module, and the Debugging message that debugging proxy module acceptance instruction back produces is accepted and demonstration;
5) debugging proxy module, this module is received the debug command that debugging interface transmits, if debug command is for inserting breakpoint, it then is the break-poing instruction of definition format voluntarily with the modifying of order of purpose breakpoint address correspondence, the former instruction that is capped is saved together with breakpoint location, when virtual machine runs into this break-poing instruction, then shut down and wait for the debug command that sends from debugger; If debug command is on-the-spot query statement or on-the-spot modify instruction, then according to 2) in the process control block (PCB) that obtains canned data operate accordingly at the memory address that belongs to process or by the register of simulator simulation; If the former instruction recovery that debug command for continue carrying out, then will be preserved, allow the virtual machine state that resumes operation; If show process tabulation instruction, then call sign is analyzed load-on module according to 2) describedly obtain the memory address of process list data structure in kernel, and travel through this structure; If specify the debug procedures instruction, then in the data structure of a current debug procedures information of simulator internal maintenance.
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