May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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Linkers and Loaders 459
EA = (BASE) + Displacement. When a program is loaded in the memory, the relevant base register is
also loaded with load address. For example, the program shown above will now look like:
in program file in memory
0000 JMP 0020 1000 JMP 0020
0010 0100 1010 0100
0014 Y 1014 Y
0020 LD -6 1020 LD -6
0024 ADD B I -14 1024 ADD B I -14
... ... ... ...
0100 X 1100 X
The ‘B’ flag in the ADD instruction indicates that the address constant at displacement
of −14 with respect to IP is taken to be displacement with respect to the Base register. Thus,
EA = (IP − 14) + (BASE) which gives the correct value ...
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