Panasonic MN1030 user manual Basic Operation of Assembler and Linker, Create source files

Chapter 3 Introduction to Operation

3.3Basic 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.

__CODE	global	data_set
	section	CODE, PUBLIC, 1
main	mov	0, A0
	mov	0xff, D0
	mov	0x80, D1
	jsr	data_set
_DATA	bra	main
	section	DATA, PUBLIC, 4
data1	ds	4
	end

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

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