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SDA Description
• There must be a crash dump file in SYS$SYSTEM: named either
SYSDUMP.DMP or PAGEFILE.SYS.
This dump file must be either large enough to hold the entire contents
of memory (as discussed in Section 1.1) or, if the DUMPSTYLE system
parameter is set, large enough to accommodate a subset dump (see
Section 1.1.2).
If SYSDUMP.DMP is not present, the operating system attempts to write
crash dumps to PAGEFILE.SYS. In this case, the SAVEDUMP system
parameter must be 1 (the default is 0).
• The DUMPBUG system parameter must be 1 (the default is 1).
10.2 Examples of How to Cause System Failures
The following examples show the sequence of console commands needed to cause
a system failure on each type of processor. In each instance, after halting the
processor and examining its registers, you place the equivalent of –1 (for example,
FFFFFFFF
16
) into the PC. The value placed in the PSL sets the processor access
mode to kernel and the IPL to 31. After these commands are executed, an
INVEXCEPTN bugcheck is reported on the console terminal, followed by a listing
of the contents of the processor registers.
The console volume of most processors contains a command file named either
CRASH.COM or CRASH.CMD, which you can execute to perform these
commands. Note that the console sessions recorded in this section omit much of
the information the console displays in response to the listed commands.
VAX 85x0/8700/88x0
The following series of console commands causes a system failure on the VAX
85x0/8700/88x0 systems. (Note that the console prompt for the VAX 8810, 8820,
and 8830 systems is PS-CIO-0> and not >>>.)
$
Ctrl/P
>>> SET CPU CURRENT_PRIMARY
>>> HALT
?00 Left CPU -- CPU halted
PC = 8001911C
>>> @CRASH
!
! Command procedure to force bugcheck via access violation
!
SET VERIFY
SET CPU CURRENT_PRIMARY !Select primary
EXAMINE PSL !Display PSL
M 00000000 00420008
EXAMINE/I/NEXT 4 0
.
.
.
DEPOSIT PC FFFFFFFF !Set PC=-1 to force ACCVIO
DEPOSIT PSL 41F0000 !Set IPL=31, interrupt stack
CONTINUE !Execute from PC=-1
SDA–32