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What is main purpose of linker file format?
A linker script controls every link. Such a script is written in the linker command language. The main purpose of the linker script is to describe how the sections in the input files should be mapped into the output file, and to control the memory layout of the output file.
What is linker script file?
The Linker Script is a text file made up of a series of Linker directives which tell the Linker where the available memory is and how it should be used. Thus, they reflect exactly the memory resources and memory map of the target microcontroller.
What is the role of linker script file in embedded C?
In the last section, we have discussed that the main role of a linker script file is to assign addresses and memory sections to application code and data according to the microcontroller memory map and format of execuatable file.
What is the use of linker?
It is important to use linkers while describing a person, place or thing. They help us in listing facts chronologically, linking events across time, comparing and contrasting sketches, explaining graphic images and illustrating the main idea. Listed below are some of the important linkers. Let us now learn them.
What is linker file in C?
Linker is a program in a system which helps to link a object modules of program into a single object file. It performs the process of linking. Linker are also called link editors. It takes object modules from assembler as input and forms an executable file as output for loader.
How do you write a script linker?
You write a linker script as a series of commands. Each command is either a keyword, possibly followed by arguments, or an assignment to a symbol. You may separate commands using semicolons. Whitespace is generally ignored.
Where to put code in a linker file?
This is a setting in the CPU component, under Build Options: Next, I’m modifying the linker file, and creating a new section (m_text2) where I want to put my dedicated code: Next, I’m extending the linker file with my placement.
How to put code into special section with GNU linker?
Next, I’m extending the linker file with my placement. For example to place the Cpu.o into my dedicated section, I use a new placement .generatedCode just before the .text placement:
How to get address from linker generated symbols?
The linker generated symbols will have an address. To use them from the application code, I have to declare them like this: Taking the address of these symbols will return the address information. To build a string with the address information I can use snprintf () or xsnprintf () (see XFormat, a Lightweight printf () and sprintf () Alternative ):
What can the GNU linker do for You?
The GNU Linker (ld) is very, very powerful. This time I wanted to put all my Processor Expert generated code into its own dedicated section. This is useful for example to have a bootloader or a library inside a special area in FLASH.