INTERSEG

$E3 INTERSEG - This record is used in the relocation dictionary of a load segment, and contains a patch to a long call to an external reference. The INTERSEG record is used to patch an address in a load segment with a reference to another address in a different load segment. It contains two 1-byte counts followed by an offset, a 2-byte file number, a 2-byte segment number, and a second offset. The first count is the number of bytes to be relocated, and the second count is a bit- shift operator, telling how many times to shift the relocated address before inserting the result into memory. If the bit-shift operator is positive, then the number is shifted to the left, filling vacated bit positions with 0’s. If the bit- shift operator is negative, then the number is shifted right.

The first offset is the location, relative to the start of the segment, of the number that is to be relocated. If the reference is to a static segment, then the file number, segment number, and second offset correspond to the subroutine referenced. The file number is always one.

For example, suppose the segment includes an instruction like

        jsl ext

where the label ext is an external reference to a location in a static segment. If this instruction is at relative address $720 within its segment and ext is at relative address $345 in segment $000A in file $0001, then the linker creates an INTERSEG record in the relocation dictionary that looks like this (note that the values are stored low-byte first, as specified by NUMSEX):

E3030020 07000001 000A0045 030000

which corresponds to the following values:

$E3	operation code
$03	number of bytes to be relocated
$00	bit-shift operator
$00000720	offset of instruction
$0001	file number
$000A	segment number
$00000345	offset of subroutine referenced

When the loader processes the relocation dictionary, it uses the second offset to find the JSL, and patches in the address corresponding to the file number, segment number, and offset of the referenced subroutine.

INTERSEG records are used for any long-address reference to a static segment