Preserving the Debugger Operating Environment

The following is an example of an exception handler which can pass an exception along to the debugger:

*

***EXCEPT - Exception handler ****

EXCEPT SUBQ.L

#4,A7

Save

space in

stack for a PC value.

LINK

A6,#0

Frame pointer

for accessing PC space.

MOVEM.L

A0-A5/D0-D7,-(SP)

Save

registers.

:

 

 

 

 

:decide here if your code handles exception, if so, branch...

MOVE.L

BUFVBR,A0

Pass exception to debugger; Get saved VBR.

MOVE.W

14(A6),D0

Get the vector offset from stack frame.

AND.W

#$0FFF,D0

Mask off the format information.

MOVE.L

(A0,D0.W),4(A6)

Store address of debugger exc handler.

MOVEM.L

(SP)+,A0-A5/D0-D7

Restore registers.

UNLK

A6

 

RTS

 

Put addr of exc handler into PC and go.

166Bug Generalized Exception Handler

The 166Bug has a generalized exception handler which it uses to handle all of the exceptions not listed in Table 4-2. For all these exceptions, the target stack pointer is left pointing to the top of the exception stack frame created. In this way, if an unexpected exception occurs during execution of your code, you are presented with the exception stack frame to help determine the cause of the exception. The following example illustrates this:

Example:

Bus error at address $F00000. It is assumed for this example

 

that an access of memory location $F00000 initiates bus error

 

exception processing.

4

MVME166IG/D2

4-15

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Motorola MVME166D2, MVME166IG/D2 manual 166Bug Generalized Exception Handler
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MVME166IG, MVME166D2, MVME166IG/D2 specifications

The Motorola MVME166IG/D2 is a pioneering embedded computer designed for high-performance applications in industrial and telecom sectors. This versatile computing platform is based on the PowerPC architecture, which ensures efficient processing capabilities and transfer of data, making it suitable for a wide range of applications, including real-time control, data acquisition, and system monitoring.

One of the main features of the MVME166IG/D2 is its powerful processor. The system is equipped with a PowerPC 603e processor, which offers a remarkable performance rate with a clock speed of up to 250 MHz. This high-speed processing capability allows for rapid data handling and processing, which is critical for demanding applications in real-time environments.

The MVME166IG/D2 also stands out due to its modular design. It supports multiple expansion slots that make it adaptable for different user needs. The system can accommodate additional cards or memory modules, allowing for increased versatility and capability in various operational scenarios.

In terms of connectivity, this embedded computer includes multiple communication interfaces such as Ethernet and serial ports, which facilitate seamless data transfer and communication within larger systems. This connectivity is crucial for integrating the device into existing industrial networks or for connecting with sensors and other equipment.

Another noteworthy characteristic of the MVME166IG/D2 is its robust build quality, which is essential for operation in challenging environments. The device is designed to endure high levels of shock and vibration, making it suitable for deployment in applications such as transportation or heavy machinery.

Additionally, the MVME166IG/D2 offers a range of software support which includes various real-time operating systems. This compatibility allows developers to choose the OS that best fits their application's requirements, enhancing the overall utility of the system.

In summary, the Motorola MVME166IG/D2 is a powerful, flexible embedded computing solution that excels in performance, modularity, and reliability. Its advanced features and durable design make it an ideal choice for industries that require precision, speed, and robustness in their computing solutions.
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