JPH0520122A - Remote debug method - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a remote debugging method capable of easily constructing a remote debugging system for debugging an application program running on a target machine in which an operating system is installed. [Configuration] The program trace function in the operating system of a normal debugger (self-debugger) is implemented by the trace simulator section (TR
S) 11 and trace handler on target machine 22
(TRH) 12 dispersed. Then, the trace simulator unit 11 receives the trace request of the debugger (DBG) 23 and transmits it to the designated target machine 22, and the trace handler unit 12 receives the trace request,
Hosts monitoring and control of the execution of the application program (AP) 24 on the specified target machine by tracing the execution of the application program 24 using the program trace function (ptrace) provided by the operating system 27 on the target machine. Realized on the machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for debugging an application program running on a target machine, and more particularly, it has an advanced debugging function for debugging an application program running on a target machine in which an operating system is installed. It relates to the remote debugging method performed on the host machine.

[0002]

2. Description of the Related Art Conventionally, as a method for debugging an application program on a target machine on a host machine, there are a simulation method and a cross debug method. In the simulation method shown in FIG. 2, a program (simulator 25) for simulating the operating environment on the target machine 22 such as the operating system 27 and the library 26 is prepared on the host machine 21,
The application program 24b is executed on the host machine 21. In the cross debug method shown in FIG. 3, the host machine 21 and the target machine 22 are integrated into an IC.
An E (In Circuit Emulator) 32 is used for connection, and execution of the application program 24 on the target machine 22 is monitored on the host machine 21. On the other hand, in the self-debugger for debugging the application program on the same machine, as shown in FIG. 4, the execution of the application program 24 is monitored and controlled.
Program trace for operating system 27
The (ptrace) function (trace function unit 41) is used. For the conventional debugger, see, for example, "Electronic Information and Communication Handbook (1988), The Institute of Electronics, Information and Communication Engineers, pp. 1855-1.
857 ”.

[0003]

In the above-mentioned simulation method of the prior art, it takes a lot of man-hours to develop a program (simulator) for simulating an operating environment such as an operating system and a library on a target machine. . In addition, since it is not a debug in a real environment, finally it is necessary to confirm the operation of the application program on the target machine. On the other hand, in the cross debug method, debugging can be performed in a real environment, but the target of debugging is an application program of an embedded system in which an operating system is not installed. Further, since the ICE has only a function of directly monitoring and controlling the CPU of the target machine, in an environment where the operation system is running and a plurality of application programs are running under the control of the ICE, a specific Monitoring the execution of application programs is very difficult. Therefore, it is difficult to debug an application program running on a target machine (personal computer or the like) in which an operating system is installed on a host machine (workstation or the like). An object of the present invention is to provide a remote debugging method that solves such problems and can easily construct a remote debugging system for debugging an application program running on a target machine in which an operating system is installed. is there.

[0004]

In order to achieve the above object, the remote debugging method of the present invention has the program trace function of the operating system in the normal debugger (self-debugger) shown in FIG. , The trace simulator section (T
By distributing each to the RS) 11 and the trace handler (TRH) 12 on the target machine 22, a specific target machine is specified, and the execution and monitoring of the application program (AP) 24 on that target machine are monitored and controlled. The feature is that it is realized on the machine 21. That is, the trace simulator unit 11 accepts a trace request from the debugger (DBG) 23 and sends it to the designated target machine 22.
Is characterized in that the trace request is received and the execution of the application program 24 is traced using the program trace function (ptrace) provided by the operating system 27 on the target machine.

[0005]

In the present invention, the program trace function of the self-debugger (the function of sending the trace request of the debugger on the host machine to the target machine and the function of receiving the request and tracing the program on the target machine) is provided. It is distributed to the host machine and the target machine, and the trace simulator section on the host machine
When a trace request from the debugger is received and sent to the specified target machine, the trace handler part on the target machine receives the trace request and the application uses the trace function provided by the operating system on the target machine. Trace program execution. As a result, it is possible to easily build a remote debug system that debugs an application program running on a target machine in which an operating system is installed. Further, the advanced debug function of the debugger on the host machine can be used for debugging the application program on the target machine.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a configuration diagram of a remote debug system according to an embodiment of the present invention. The remote debugging system of the present embodiment is composed of a host machine and a target machine. In FIG. 5, 23 has a trace simulator section 11 and is a remote debugger running on the host machine, 11 is a trace simulator section, and 51a and 51b are An application program file, 52 is a server running on the target machine, 12 is a trace handler unit, and 24 is an application program. Also,
Both the host machine and the target machine are equipped with an operating system (for example, UNIX). Note that this system accepts the debug commands shown in Table 1 below.

[Table 1] With such a configuration, the server 5 on the target machine
In response to a communication connection request (a connection request specifying a specific target machine) from the remote debugger 23 on the host machine, 2 creates a child process and activates the trace handler unit 12. The trace handler unit 12 will
In accordance with a trace request from the trace simulator section 11 of the remote debugger 23, activation and execution of the application program 24 are controlled and monitored.

Next, the procedure of remote debug processing by the above command will be described. (1) target command processing When the remote debugger 23 receives the target command,
Establish a communication link with the server on the target machine PC. (2) Debug command processing When the remote debugger 23 receives a debug command, r
The ead file request is sent via the trace simulator unit 11.
Send to target machine. As a result, the trace handler unit 12 on the target machine reads the application program file 51b and sends it to the host machine. The remote debugger 23 on the host machine analyzes the symbol information of the transmitted application program file and obtains the address of the source line or variable. (3) Stop command processing When the remote debugger 23 receives the stop command, it knows the address corresponding to the specified line and creates a source line and a breakpoint table for managing that address. (4) Run command processing When the remote debugger 23 receives the run command, it executes
The request is sent to the target machine via the trace simulator unit 11. As a result, the trace handler unit 12 on the target machine performs fork / exec and activates the application program 24. Further, the remote debugger 23 thereafter executes execution continuation processing (cont command processing). (5) Print command processing When the remote debugger 23 receives the print command processing, it sends a ptrace request to the target machine via the trace simulator unit 11 to obtain the value of the specified variable. As a result, the trace handler unit 12 on the target machine executes ptrace via the trace function unit 41 (not shown in FIG. 5) shown in FIG. 1, obtains the value of the specified variable, and executes it. Return to. (6) Cont command processing When the remote debugger 23 receives the cont command processing, it embeds a breakpoint in the application program 24 according to the breakpoint table.
Resume execution of the application program 24,
After the execution is stopped, a series of processes of removing the breakpoint in the breakpoint table from the application program 24 is performed. Further, the remote debugger 23 sends an instruction (ptrace request) to these application programs 24 to the target machine via the trace simulator section 11, and the trace handler section 12 on the target machine executes ptrace to the application programs 24. Execute and return the result to the host machine.

[0008]

According to the present invention, the trace simulator unit for transmitting a trace request to the target machine is targeted to the host machine, and the trace handler unit for receiving the trace request and tracing the program on the target machine is targeted. A remote debug system that debugs an application program running on a target machine in which an operating system is installed on a host machine can be easily constructed only by implementing it on a machine. As a result, the advanced debug function of the debugger on the host machine (workstation or the like) can be used for debugging the application program on the specified target machine.

[0009]

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a remote debugging method of the present invention.

FIG. 2 is an explanatory diagram of a conventional simulation method.

FIG. 3 is an explanatory diagram of a conventional cross debug method.

FIG. 4 is an explanatory diagram of a conventional self-debug system.

FIG. 5 is a configuration diagram of a remote debug system according to an embodiment of the present invention.

[Explanation of symbols]

 11 Trace Simulator 12 Trace Handler 21 Host Machine 22 Target Machine 23 Debugger 24 Application Program 24a Application Program 24b Application Program 25 Simulator 26 Library 27 Operating System 31 Cross Debugger 32 ICE 41 Trace Function Section 51a Application Program File 51b Application Program File 52 server

Claims (1)

Claim: What is claimed is: 1. A remote debugging method, wherein a debugger on a host machine debugs an application program running on a target machine on which an operating system is installed. The host machine is provided with means for transmitting, the target machine is provided with means for receiving the trace request and tracing the program, and the trace request sending means accepts the trace request of the debugger and sends it to the designated target machine, The trace means receives the request and traces the execution of the application program using the trace function provided by the operating system, thereby executing the application program running on the designated target machine. Remote debugging wherein the debugging on the host machine.