User`s guide

287Targeting MC56F83xx/DSP5685x Controllers

ELF Linker and Command

Language

The CodeWarrior™ Executable and Linking Format (ELF) Linker makes a program

file out of the object files of your project. The linker also allows you to manipulate

code in different ways. You can define variables during linking, control the link order

to the granularity of a single function, change the alignment, and even compress code

and data segments so that they occupy less space in the output file.

All of these functions are accessed through commands in the linker command file

(LCF). The linker command file has its own language complete with keywords,

directives, and expressions, that are used to create the specifications for your output

code. The syntax and structure of the linker command file is similar to that of a

programming language.

This chapter contains the following sections:

• Structure of Linker Command Files

• Linker Command File Syntax

• Linker Command File Keyword Listing

• DSP56800E Command-Line Tools

Structure of Linker Command Files

Linker command files contain three main segments:

• Memory Segment

• Closure Blocks

• Sections Segment

A command file must contain a memory segment and a sections segment. Closure

segments are optional.