You're reading from Mastering Embedded Linux Programming - Third Edition

Product type Book

Published in May 2021

Publisher Packt

ISBN-13 9781789530384

Pages 758 pages

Edition 3rd Edition

Languages

Concepts

Embedded Systems

Authors (2):

Frank Vasquez

Chris Simmonds

View More author details

Table of Contents (27) Chapters

Preface

1. Section 1: Elements of Embedded Linux

2. Chapter 1: Starting Out

3. Chapter 2: Learning about Toolchains

4. Chapter 3: All about Bootloaders

5. Chapter 4: Configuring and Building the Kernel

6. Chapter 5: Building a Root Filesystem

7. Chapter 6: Selecting a Build System

8. Chapter 7: Developing with Yocto

9. Chapter 8: Yocto Under the Hood

10. Section 2: System Architecture and Design Decisions

11. Chapter 9: Creating a Storage Strategy

12. Chapter 10: Updating Software in the Field

13. Chapter 11: Interfacing with Device Drivers

14. Chapter 12: Prototyping with Breakout Boards

15. Chapter 13: Starting Up – The init Program

16. Chapter 14: Starting with BusyBox runit

17. Chapter 15: Managing Power

18. Section 3: Writing Embedded Applications

19. Chapter 16: Packaging Python

20. Chapter 17: Learning about Processes and Threads

21. Chapter 18: Managing Memory

22. Section 4: Debugging and Optimizing Performance

23. Chapter 19: Debugging with GDB

24. Chapter 20: Profiling and Tracing

25. Chapter 21: Real-Time Programming

26. Other Books You May Enjoy

The process memory map

Each running process in user space has a process map that we can inspect. These memory maps tell us how a program's memory is allocated and what shared libraries it is linked to.

You can see the memory map for a process through the proc filesystem. As an example, here is the map for the init process, PID 1:

# cat /proc/1/maps
00008000-0000e000 r-xp 00000000 00:0b 23281745 /sbin/init
00016000-00017000 rwxp 00006000 00:0b 23281745 /sbin/init
00017000-00038000 rwxp 00000000 00:00 0        [heap]
b6ded000-b6f1d000 r-xp 00000000 00:0b 23281695 /lib/libc-2.19.so
b6f1d000-b6f24000 ---p 00130000 00:0b 23281695 /lib/libc-2.19.so
b6f24000-b6f26000 r-xp 0012f000 00:0b 23281695 /lib/libc-2.19.so
b6f26000-b6f27000 rwxp 00131000 00:0b 23281695 /lib/libc-2.19.so
b6f27000-b6f2a000 rwxp 00000000 00:00 0
b6f2a000-b6f49000 r-xp 00000000 00:0b 23281359 /lib/ld-2.19.so
b6f4c000-b6f4e000 rwxp 00000000 00:00 0
b6f4f000-b6f50000 r...