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F.2.4. EM$SNAPPKT
Interface to Selected Extended Mode Executive Requests
The EM$SNAPPKT PROC generates the packet for the EM$SNAP PROC.
Calling Sequence
label EM$SNAPPKT snap-id,xar,len,address
Parameters
snap-id
xar
len
address
The snapshot identifier, from 1 to 6 characters (in quotes).
The bits identifying which registers to dump (same as for L$SNAP PROC).
The number of words to dump.
The address (18-bit offset from zero) to start dumping words from.
All of the parameters may also be set at execution time. The snap-id parameter is
located at word 2 of the packet (packet address + 1). The xar parameter is located in bits
35 to 33 of word 3 of the packet. The len and address parameters are located in bits 32
to 18 and in H2 of word 3, respectively.
The dump address must be in either the same bank that contains the packet or in a bank
that is based on B15 when EM$SNAP is called.
The value given for address must be greater than the highest address of the SYSLIB$1
common bank rounded up to the next highest 01000. The highest address of the
SYSLIB$1 common bank is given in Table D–2. This is necessary because common bank
SYSLIB$1 is based to perform the ER SNAP$ and any address to be dumped that
overlaps the SYSLIB$1 address limits will give incorrect results.
7833 1733–004 F–5