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Debugger General Information
B
Offset Registers
B-32
An
Ñ Address register n.
Xn
Ñ Index register n (An or Dn).
d
Ñ Displacement (any valid expression).
bd
Ñ Base displacement (any valid expression).
od
Ñ Outer displacement (any valid expression).
n
Ñ Register number (0 to 7).
Rn
Ñ Offset register n.
In commands with RANGE specified as ADDR DEL
Note
ADDR, and with size option W or L chosen, data at the
second (ending) address is acted on only if the second
address is a proper boundary for a word or longword,
respectively
Eight pseudo-registers (R0 through R7) called offset registers are
used to simplify the debugging of relocatable and position-
independent modules. The listing files in these types of programs
usually start at an address (normally 0) that is not the one at which
they are loaded, so it is harder to correlate addresses in the listing
with addresses in the loaded program. The offset registers solve
this problem by taking into account this difference and forcing the
display of addresses in a relative address+offset format. Offset
registers have adjustable ranges and may even have overlapping
ranges. The range for each offset register is set by two addresses:
Base
Top
Specifying the base and top addresses for an offset register sets its
range. In the event that an address falls in two or more offset
registers' ranges, the one that yields the least offset is chosen.
Relative addresses are limited to 1MB (5 digits),
Note
regardless of the range of the closest offset register.
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