ADDRESS REFERENCE ADJUSTMENT UPON CODE RELOCATION	

Relocation of programs generally calls for a few internal adjustments.
Parts of a program (certain of its instructions) typically reference
addresses within the program. Obviously, if the program as a whole
gets shifted from one place in memory to another (i.e., relocated),
every portion of the program moves with it. So any part of the program
that accounts for the address of the program, must account for the
change of address of the program.

This is discussed in the Stallings textbook's chapter 7 and
specifically Appendix 7A.

Here is an example. It is a machine language program whose load point
is at memory location 500. Suppose it is reloaded at
850 instead, shown in the middle column. Then the operands
of the 4 instructions have to change, because they reference the data
portion of the program and it has moved. In general, if the program is
relocated to an address x, the needed adjustments in terms of x are
shown in the rightmost column.

Initial memory:		If relocated to 850:	If relocated to x:

500	1 505			850	1 855			x	1[x+5]
501	3 506			851	3 856			x+1	3[x+6]
502	5 507			852	5 857			x+2	5[x+7]
503	2 504			853	2 854			x+3	2[x+4]
504	0007			854	0007			x+4	0007
505	0008			855	0008			x+5	0008
506	0002			856	0002			x+6	0002
507	0003			857	0003			x+7	0003