JPS62221746A - Data processing system - Google Patents

Abstract

PURPOSE:To improve the debugging efficiency by using a circuit which produces the control signal to inhibit a tracing action to a tracing memory based on the tracing stop signal given from an input operation device and the detection signal given from a tracing condition deciding circuit. CONSTITUTION:A circuit consisting of the flip-flops 18 and 19, a NOR gate G1 and an AND gate G2 produces the control signal to inhibits a tracing action to a tracing memory based on the tracing stop signal given from an input operation device 17 like a keyboard, etc., and the detection signal given from a tracing condition deciding circuit 14 that decides the pass through a tracing point and when one of these two signals is received. Then only the tracing action is discontinued at an optional time point without discontinuing a program while this program is executed by emulation. Thus the tracing contents can be confirmed. As a result, the debugging effect is improved for the user system and the user program obtained by emulation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to data processing technology, and relates to a technology that is effective when used in a system such as an emulator that emulates a microcomputer.

[Prior Art] When developing rough hardware or debugging a microcomputer system developed by a user, an apparatus as shown in FIG. 2 is sometimes used. In other words, the microcomputer system (user
An adaptive system emulator with a built-in MPU identical to the MPU of system 1 is connected via connector 3 to IC socket 2 for a microcomputer (hereinafter referred to as MPU) installed on boat 1a constituting system 1. 4 (hereinafter referred to as ASE).

This ASE 4 is connected via a cable to a system development device 7 called a support tool, which includes a CRT display 5, floppy disk devices 6a, 6b, and the like.

In the system described above, a source program written in a language such as an assembler or compiler that is manually entered from the keyboard on the side of the CRT display 5 is first written to a storage device consisting of a floppy disk 6a, and then stored in the system development device 7. It is translated into machine language by the MPU and written to the floppy disk 6b in the form of an object program. The program written on the floppy disk 6b is transferred to a RAM (random access memory) 8 or the like in the user system 1 by the MPU in the ASE d, and is written therein.

The user program written to RAM8 etc. is
When you pull out connector 3 from C socket 1-2 and insert system M P tJ 9, this M
However, in the system shown in Figure 2, the user's
It is now possible to debug programs.

In this case, it is necessary to control the CRT diskless 5, floppy disk drive [6a, 6b, etc., translate assembler or compiler language into machine language, and also use ASE4
A host MPU is provided in the system development device 7, which edits data obtained by executing a user program using the MPU in the system development device 7, and displays the data on the CRT display 5. The data is sent to the MPU in the system development device 7.
It is possible to provide a function that allows processing in a format that is easy to edit. In the above system, MPU in ASE4
When the MPU in the ASE 4 is configured to have both emulation and data processing functions, the MPU in the ASE 4 executes its operations by dividing the space between the emulation mode and the system mode in the system development device 7.

An emulator system having the above configuration has already been disclosed in Japanese Patent Application No. 58-34565.

By the way, when debugging a user program using the emulator system mentioned above, the program is generally cut into pieces and emulation is performed. The passage is detected and the execution of the program is interrupted at that point. The state of the system immediately before the break is captured in real time by capturing signals on the bus into a storage device called a trace memory. By analyzing the contents of the trace memory after a break, it is possible to determine the cause of a runaway program and to debug the user program or system.

41 In other words, in conventional emulator systems, if you wanted to see the traced content, you had to set a breakpoint in advance and interrupt execution when the program passed the breakpoint ([stock] 1) Tachi Seisakusho, published September 1985, "Hitachi Microcomputer System 6305 U O/6305 VO Emulator User's Manual" pages 64 to 881
(see 1).

[Problems to be Solved by the Invention] However, in the case of a system that uses a single-chip microcomputer as a controller, for example, in a system that controls a machine such as a mechanically operated motor, the problem occurs when the motor is kept running. In other words, you may want to examine the traced contents without interrupting the program. However, with conventional emulator systems, it is not possible to view the trace contents without interrupting the program.

Therefore, a method can be considered in which tracing can be interrupted at any time during program execution so that its contents can be referenced. However, systems that perform emulation often have a bug, which can cause the system to run out of control. In this case, if the trace point is not passed, the trace contents cannot be viewed because the race is not interrupted. The inventors of the present invention have found that, as a result, there is an inconvenience in that debugging of user systems and user programs is inefficient.

The purpose of this invention is to
The purpose is to improve the efficiency of debugging systems and user programs, and to shorten the system development period.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means for Solving the Problems] Representative inventions disclosed in this application will be summarized as follows.

That is, based on a trace stop signal from an input operation device such as a keyboard and a detection signal from a trace condition determination circuit that determines whether or not a trace point has been passed, if either signal comes in, the trace is stopped. A circuit is provided for forming a control signal to the memory to inhibit tracing.

[Function] According to the above-mentioned means, while the program is being executed by emulation, only the I-race can be stopped at any point without interrupting the program, and the trace contents can be viewed. Increase the efficiency of debugging and user programs.

The above objective of shortening the system development period can be achieved.

[Embodiment] FIG. 1 shows an embodiment of an emulator system according to the present invention.

In the figure, what is indicated by the symbol ]0 is .

This MPU 1.0 is the same type as the MPU 9 that constitutes the user system 1. It is composed of MPU. MPU10 is connected to user system 1 via bus 2o. An insert kit emulator is constituted by this emulation MPU 10, an emulation controller 11 provided in the system development device 7, a break condition determination circuit 12, a trace memory 13, a trace determination circuit 14, and the like.

The trace memory]-3 is provided to capture input/output signals appearing on the bus 20 in time series while the MPU10 is executing a user program. The trace condition determination circuit 14 has a register for setting trace start and end conditions, and outputs a trace instruction signal TRC to the trace memory 13. The break condition determination circuit 12 has a register that sets conditions for the end (break point) of a series of programs to be divided and executed during debugging, and the contents of this register and address signals on the bus, etc. It is detected whether the two match by hardware comparison, and if they match, the M
Interrupts P U II O to interrupt program execution.

On the other hand, the emulation controller 11
6 is connected to the host MPU 15 that controls the system development device 7, and when a command such as to start execution of a user program comes in from the input operation device 17 such as a keyboard of a CRT display, it is connected to the host MPU 15 that controls the system development device 7. It determines whether or not the command exists and supplies the command to MPU10. When MPU10 receives this command, it outputs an appropriate address signal to switch the space, that is, to switch from the system mode to the emulation mode in which the user program is executed.

Further, in this embodiment, by operating an appropriate key on the keyboard 17, it is possible to stop the tracing of the signal on the bus 20'' by the trace memory 13.

That is, the flip-flop 18 is set to the set state by the host MPU 15 when the trace stop key is operated, and the flip-flop is set to the set state when the trace condition determination circuit 14 detects the trace end point. A front plate 19 is provided. The outputs Q of flip-flops 18 and 19 are each supplied to one input terminal of an AND gate G2 via a NOR gate G1. This AND gate G2
A status signal EMU outputted from the emulation controller 11 and indicating that the user program is being executed is supplied to the other input terminal of the trace memory 13, and the trace memory 13 is set in a tracing enabled or disabled state depending on the output signal of the AND gate G2. It is becoming more and more popular.

The flip-flops 18 and 19 are first put into a reset state upon initialization of the system, and their outputs Q are both brought to a low level. On the other hand, the status signal EMU output from the emulation controller 11 is set to a high level, for example, during execution of the user program.

Therefore, the output of the AND gate G2 is first set to a high level, and accordingly, the trace memory 13 is placed in a traceable state. Then, the trace condition determination circuit 14
Tracing of signals on the bus 20 is started in response to an instruction signal TRC from the bus 20.

When a trace stop signal is input from the keyboard 17 during trace execution, the flip-flop 18 is set by the host MPU 15, and its output Q is changed to high level. Then, NOR gates GI and A
N+) The output of gate G2 changes to low level,
The 1-1 north memory 13 is transitioned to a non-traceable state. Furthermore, in response to this, emulation controller 1
- The roller 11 edits the content previously captured in the trace memory 13 and sends it to the host MPU 15 to be displayed on the screen of the CRT display device 5.

Further, in the emulator system of this embodiment, when the trace condition determination circuit 14 detects that the set trace end point has been passed, the trace stop signal TS is output.

This sets the flip-flop 19 and N
The outputs of the OR gate G□ and the AND gate G2 are changed to low level, and tracing by the trace memory 13 is stopped.

Note that regardless of the presence or absence of the trace stop signal TS from the trace condition determination circuit 14 and the trace stop signal generated by the operation of the keyboard 17, the status signal EMU indicating that the user program is being executed is output from the controller 11.
is changed to low level, the trace memory 13
Tracing is not performed.

As described above, when the host MPU 15 confirms that the trace is to be resumed in a state where the trace is stopped, it supplies the reset l~ signal to the flip-flops 18 and 19. Then, the outputs of the flip-flops 18 and 19 both change to high level, and the controller 11
The trace memory 13 is placed in a traceable state on the condition that the status signal EMU from the program controller indicates that the program is being executed. Then, tracing is restarted in response to the instruction signal TRC from the trace condition determination circuit 14.

As explained above, in the above embodiment, either one of A circuit is installed that generates a control signal that prohibits tracing from being traced to the trace memory when a signal is received, so tracing can be stopped at any point during program execution by emulation without interrupting the program. The effect of being able to view trace contents improves the efficiency of debugging a user system or user program through emulation and shortens the system development period.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. Nor. For example, in the embodiment 1, the trace is configured so that it can be interrupted by operating the keyboard or passing the trace end point in the trace condition determination circuit 14, but it is also possible to use the trace end point and breakpoint in common. be.

Furthermore, in the above embodiment, breakpoints and tracepoints are set as examples of designated points for starting or stopping certain operations upon detecting the occurrence of some event during emulation. However, the present invention is not limited thereto and can be applied to a system in which arbitrary conditions are set.

In the above explanation, the invention made by the present inventor was mainly applied to an emulator system, which is the background field of application. It can be used when you want to stop some operation at the point in time.

[Effects of the Invention] The effects obtained by typical inventions disclosed in this application will be explained below in terms of Wi-111-.

That is, it is possible to improve the efficiency of debugging the user system and user program by emulation, and to shorten the system development period by +1 [1].

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of the essential parts of an emulator system to which the present invention is applied, and FIG. 2 is a schematic configuration diagram showing an example of the overall configuration of an emulator system to which the present invention is applied. It is a diagram. 1... User system, 2... IC socket, 3... Connector, 4... ASE (Adaptive System Emulator), 5... CRT
Display, 6a, 6b...Floppy disk device, 7...System development device, 8...RAM
, 9...MPU (microcomputer), 10.
... MPU for emulation, 11 ... emulation controller, 12 ... break condition judgment circuit, 13 ... storage means (trace circuit), 1
4... Trace condition determination circuit, 15... Host MPU, 16.20... Bus, 17... Input operation device (keyboard), 18.19... Flip-flop. 16 one

Claims (1)

[Scope of Claims] 1. It is equipped with a microcomputer of the same type as the microcomputer of the target system, is capable of emulating that system, and maintains conditions for detecting the occurrence of a certain event. , a break condition determination circuit that compares this condition with the signals on the bus, detects the occurrence of the above event, and forms a program execution stop signal, and sequentially captures and holds the signals on the bus during program execution. A data processing system comprising a storage means for a bus, the signal forming system forming a control signal indicating whether or not a signal on a bus can be taken into the storage means based on a signal from an input operation device. A data processing system comprising: means. 2.Equipped with a trace condition judgment circuit that holds a trace end condition and forms a trace end signal by comparing this condition with a signal on the bus, etc., and a trace stop signal output from this trace condition judgment circuit and an input operation. The data processing system according to claim 1, further comprising a signal forming means for forming a control signal indicating whether tracing is possible or impossible for the storage means based on a signal from the device. .