Intel 80C188XL - Manual (Page 43)

OVERVIEW OF THE 80C186 FAMILY ARCHITECTURE
2-14
Figure 2-9. Dynamic Code Relocation
To be dynamically relocatable, a program must not load or alter its segment registers and must
not transfer directly to a location outside the current code segment. All program offsets must be
relative to the segment registers. This allows the program to be moved anywhere in memory, pro-
vided that the segment registers are updated to point to the new base addresses.
Code
Segment
Stack
Segment
Data
Segment
Extra
Segment
Stack
Segment
Data
Segment
Extra
Segment
Before
Relocation
After
Relocation
Free Space
Code
Segment
CS
SS
DS
ES
CS
SS
DS
ES
A1039-0A