Panasonic MN1030 User Manual

Chapter 3 Introduction to Operation

Basic Operation of Assembler and Linker 25

3.3

Basic Operation of Assembler and Linker

The Cross-Assembler uses a section address format, in which the start address for each section as

defined with the section directive corresponds to its start address when linked. This allows the

programmer to freely change the order of linking files.

The following explanation illustrates a simple example of only one section. In this example you will

assemble and link two source files, program1.asm and program2.asm.

These two files have related external references and external definitions, where the subroutine of

program2.asm is called from program1.asm. Therefore the final list files cannot be created just by

assembling program1.asm. In this example, you will generate with the linker a map file and generate

the final list files.

Create source files

First, create the source files. Using an editor, create the two programs shown below (program1.asm and

program2.asm).

The contents of program1.asm are as follows.

program1.asm consists of a section called _CODE (attribute CODE, link type PUBLIC) and a section

called _DATA (attribute DATA, link type PUBLIC).

global

data_set

__CODE

section

CODE, PUBLIC, 1

main

mov

0, A0

mov

0xff, D0

mov

0x80, D1

jsr

data_set

bra

main

_DATA

section

DATA, PUBLIC, 4

data1

end