Locating Logical Dump Records
The first logical dump record contains a dump file information record
(DMPINREC). The second and third logical dump records each contain a dump
file key storage record,DMPKYRECI and DMPKYREC2 respectively. The dump
file key storage records contain the value of the storage keys assigned to each page
of virtual storage. The remaining logical dump records contain the virtual machine
storage dump.CP records the storage dump sequentially starting with the lowest address dumped
and ending with the highest address dumped.CP records each byte as an untransĀ
lated 8-bit binary value.
For a description of the format and contents of DMPINREC, seeVM / SP Data
Areas and Control Block Logic, Volume 1. For a description ofDMPKYRECI and
DMPKYREC2, see DMPKYREC also inVM / SP Data Areas and Control Block
Logic, Volume 1.
To locate a specific logical dump record, use the algorithm:
loc = 240+16n+4096n4096 where: Q is a number that identifies the dump record. For example, to locate the first
dump record, assignQ a value of 1; to locate the second record, assign Q a value of
2, and so forth.
loc is the quotient and remainder of the algorithm. Together these values specify a
spool file record and an offset into that record where logical dump recordQ begins.
The quotient specifies the spool file record, and the remainder specifies the offset
into the spool file record.
The following example shows how to locate the third logical dump record:
loc 240+(16x3)+(4096x3)
loc = 125764096 quotient = 3 4096 remainder = 288
Thus, the third dump record starts 288 bytes into the third spool file record.
Introductiort to Debugging 523
The first logical dump record contains a dump file information record
(DMPINREC). The second and third logical dump records each contain a dump
file key storage record,
file key storage records contain the value of the storage keys assigned to each page
of virtual storage. The remaining logical dump records contain the virtual machine
storage dump.
and ending with the highest address dumped.
lated 8-bit binary value.
For a description of the format and contents of DMPINREC, see
Areas and Control Block Logic, Volume 1. For a description of
DMPKYREC2, see DMPKYREC also in
Logic, Volume 1.
To locate a specific logical dump record, use the algorithm:
loc = 240+16n+4096n
dump record, assign
2, and so forth.
loc is the quotient and remainder of the algorithm. Together these values specify a
spool file record and an offset into that record where logical dump record
The quotient specifies the spool file record, and the remainder specifies the offset
into the spool file record.
The following example shows how to locate the third logical dump record:
loc 240+(16x3)+(4096x3)
loc = 12576
Thus, the third dump record starts 288 bytes into the third spool file record.
Introductiort to Debugging 523