E Help In Debugging Programs; Appendix Overview - Digital Equipment 300 Series AXP Reference Manual

Appendix Overview

Memory-Based
Data Structures
In This
Appendix
Help in Debugging Programs
The DEC 3000 AXP console stores away memory-based data
structures that may help in debugging certain crashes. These
structures are:
• Impure area—This area contains the saved machine state on
an entry into console.
• Machine check logout—This area contains the last machine
check log caused by:
– A system/processor correctable error (small frame)
– A system/processor uncorrectable error (large frame)
For example:
A MCHECK FR PAL (Machine CHECK FRom PAL) implies
that the system encountered a machine check condition while
executing PALcode and not while executing operating system
code. Because of this, an operating system level crash dump
does not take place. Instead, a machine check logout frame
is created by the PALcode before entering console mode. This
logout frame may be examined while in console mode, using
the commands.
examine
This appendix describes each data structure.
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