TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

SNOOP. [CALLI 176]
22.159 SNOOP. [CALLI 176]
FUNCTION
Allows privileged programs to insert breakpoints in the monitor
trap to a user program. The user program must be locked in core
the trap occurs (refer to LOCK monitor call). This feature is
for fault insertion, performance analysis, and trace functions.
one job can use SNOOP. at any time.
that
when
used
Only
CAUTION
Improper use of the SNOOP. call can cause the system
to fail in a number of ways. User programs may
require special code for multiprocessor systems
because the monitor may be executing the same code
simultaneously on several systems and at different
interrupt levels.
Refer to Chapter 10 for more information about the SNOOP. monitor
call. Do not attempt to use this call until you are familiar with its
operation.
CALLING SEQUENCE
MOVE ac, [XWD fcncode,addr]
SNOOP. ac,
error return
skip return
addr:
argument list
In the calling sequence, the program supplies the following variables:
o
o
fcncode is one of the function codes described below.
addr is the address of the argument list. The words at addr
depend on the given function.
The function codes and their meanings are:
Code
o
Symbol
.SODBP
Function
Defines breakpoints. This function is illegal if
breakpoints have been inserted.
The argument list for the .SODPB function is:
arglst: EXP arglength
EXP symbol checksum
EXP address
instruction
EXP address
instruction
In the argument word:
o arglength is the length of the argument list.
This must be 2 + the number of
address-instruction pairs in the argument list
times 2 .
22-400