User`s manual

Using the Debugger

2-5

Once a qualifier has been entered, it remains valid for all addresses

entered for that command sequence, until either the debugger is

reentered or another qualifier is provided.

In the alternate register number (Rn) form, the debugger uses the

address contained in MPU Register Rn, where n is 0 through 31 (i.e.,

0, 1, . . . 31).

If the address range specified as ADDR ADDR, with a size option

of either H (half-word) or W (word), data at the second (ending)

address is acted on only if the second address is a proper boundary

for a half-word or word. Otherwise, the range is truncated so that

the last byte acted upon is at an address that is a proper boundary.

Offset Registers

Eight pseudo-registers (Z0-Z7) 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 and top,

both of which are standard in a given 64-bit offset register.

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.

Note Relative addresses are limited to 1MB (5 digits),

regardless of the range of the closest offset register.