- EGTAPI can display
variables
in the assembler program
that has been
defined using the
ds or
dc
assembler directive
- Facts
(from lectures that
may not have been
discussed yet):
- Program variables are
stored in computer memory (RAM)
- Static variables
are defined using
the ds or the
dc
M68000 directives
- These variables are always associated with a program label
- Local and parameter variables are stored on the program stack
EGTAPI provide display options to show static variables that have been defined using the ds or the dc M68000 directives
- Program variables are
stored in computer memory (RAM)
- Pre-requisite for a
program variable defined by
ds or
ds to be
accessible by
EGTAPI:
- A
program variable defined by
ds or
ds is
accessible by
EGTAPI
only when:
- The associated label of the variable is defined as externally defined using the .global clause
Example: suppose you have the following fragment of assembler code with 2 lables A and B:
.global A .... A: .skip 4 B: .skip 4 ....The EGTAPI can access the variable A (because it has been .global-ed) but may not be able to access the variable B (I say "may" because some assembler will also make B available, but there is no guarantee that it will always work)
- A
program variable defined by
ds or
ds is
accessible by
EGTAPI
only when:
- To display the
value in a
simple variable
(= not an array or linked list):
- Click on the
"Var" tab.
- Type the
the label
(must be .global-ed) in the
box:
- Select
how
the value at the
label must be
displayed
(i.e.: specify the
data type of the
variable):
Then click the Add button
- Click on the
"Var" tab.