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Working with the ELF linker

AN3350

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Doc ID 018512 Rev 2

Working with the ELF linker

This chapter documents the Executable and Linkable Format (ELF) Linker. The linker is a

command line tool used to join relocatable ELF object files into an executable ELF file. The

linker accepts the names of object and library files as arguments and produces its result by

arranging their content according to directives and templates that reside in a Linker

Command File. Most aspects of the linking process are described in the LCF file, and some

can be controlled by using command line arguments (for contradicting options - the

command line ones take precedence over the LCF).

The ELF Linker has several extended functions that allow you to manipulate code in different

ways. You can define variables during linking, control the link order to the granularity of a

single section, and change the alignment.

You access these functions through commands in the linker command file (LCF). The linker

command file has its own syntax complete with keywords, directives, and expressions, that

you use to manipulate the linker. The command file syntax and structure is similar to that of

a programming language, and is described in these sections:

●

Invocation and command line switches describes the command line switches

●

Structure of linker command files describes command file organization

●

Linker command file syntax shows how to direct the linker for specific tasks

●

Alphabetical keyword listing an alphabetical listing of LCF functions and commands

●

Code and data sections shows how to determine to which memory space a section

loads

11.1

Invocation and command line switches

This section shows the command line switches that linker supports.

Following is the syntax for linker usage:

etpu_bins --ld <linker arguments>

Table 9 describes each of the command line switches that linker supports.

Table 9.

Linker command line switches

Options

Switch

Description

General options

-h -help

Display usage message

-V -version

Display version number

-err <file>

Log errors to file

-o -out <file>

Specify output file name

-f <file>

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