RLD record format

Columns

Contents

1

X'02'

2–4

RLD

5–10

Space

11–12

Data field count—number of bytes of information in data field (columns 17–72)

13–16

Space

17–72

Data field:

17–18

Relocation ESDID

19–20

Position ESDID

21

Flag byte. Describes the type of relocation required:

Bit 0

Reserved

Bit 1

If 1, add 4 to address constant length

Bit 2—3

Address constant type:

0: A
1: V
2: Q
3: CXD

Bits 4–5

Address constant length minus 1

Bit 6

Direction of relocation (0 for +, 1 for -)

Bit 7

If 1, the same P-ID and R-ID for the next RLD item

22–24

Absolute address to be relocated

25–72

Remaining RLD entries

73–80

Deck ID, sequence number, or both. The deck ID is the name from the first TITLE statement that has a non-spaces name field. The name can be 1–8 characters or if there is no name, the remaining columns contain a record sequence number.

If the rightmost bit of the flag byte is set, the following RLD entry has the same relocation ESDID and position ESDID, and this information is not repeated; if the rightmost bit of the flag byte is not set, the next RLD entry has a different relocation ESDID or position ESDID, and both ESDIDs are recorded.

Certain combinations in the Flag byte are used to indicate Relative-Immediate relocation items:

B'x111 00xx'   2-byte Relative-Immediate reference
B'x111 10xx'   4-byte Relative-Immediate reference

The first RLD item on each RLD record must specify the Relocation and Position ESDIDs; thus, the last RLD item on a record must not set the rightmost bit of the flag byte.

For example, if the RLD entries 1, 2, and 3 of the program listing contain the following information:

        Position   Relocation
Entry   ESDID      ESDID        Flag   Address

1       02         04           0C     000100
2       02         04           0C     000104
3       03         01           0C     000800

then columns 17–72 of the RLD record are:

       │         Entry 1       │  Entry 2  │         Entry 3       │
       │                       │           │                       │
Column:│17 18 19 20 21 22 23 24│25 26 27 28│29 30 31 32 33 34 35 36│37├───>72
       ├──┬──┬──┬──┬──┬──┬──┬──┼──┬──┬──┬──┼──┬──┬──┬──┬──┬──┬──┬──┤
       │00│04│00│02│0D│00│01│00│0C│00│01│04│00│01│00│03│0C│00│08│00│
       ├──┴──┴──┴──┴──┴──┴──┴──┼──┴──┴──┴──┼──┴──┴──┴──┴──┴──┴──┴──┤
       │ ESD Ids    ∧  Address │∧  Address │ ESD Ids    ∧  Address │ Spaces
       │            │          ││          │            │          │
       │            Flag       │Flag       │            Flag       │
       │            (Set)      │(not       │            (not       │
       │                       │set)       │            set)       │