Book Image

Mastering Embedded Linux Programming

By : Chris Simmonds
Book Image

Mastering Embedded Linux Programming

By: Chris Simmonds

Overview of this book

Mastering Embedded Linux Programming takes you through the product cycle and gives you an in-depth description of the components and options that are available at each stage. You will begin by learning about toolchains, bootloaders, the Linux kernel, and how to configure a root filesystem to create a basic working device. You will then learn how to use the two most commonly used build systems, Buildroot and Yocto, to speed up and simplify the development process. Building on this solid base, the next section considers how to make best use of raw NAND/NOR flash memory and managed flash eMMC chips, including mechanisms for increasing the lifetime of the devices and to perform reliable in-field updates. Next, you need to consider what techniques are best suited to writing applications for your device. We will then see how functions are split between processes and the usage of POSIX threads, which have a big impact on the responsiveness and performance of the final device The closing sections look at the techniques available to developers for profiling and tracing applications and kernel code using perf and ftrace.
Table of Contents (22 chapters)
Mastering Embedded Linux Programming
About the Author
About the Reviewers

Process memory map

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/
b6f1d000-b6f24000 ---p 00130000 00:0b 23281695   /lib/
b6f24000-b6f26000 r-xp 0012f000 00:0b 23281695   /lib/
b6f26000-b6f27000 rwxp 00131000 00:0b 23281695   /lib/
b6f27000-b6f2a000 rwxp 00000000 00:00 0
b6f2a000-b6f49000 r-xp 00000000 00:0b 23281359   /lib/
b6f4c000-b6f4e000 rwxp 00000000 00:00 0
b6f4f000-b6f50000 r-xp 00000000 00:00 0          [sigpage]
b6f50000-b6f51000 r-xp 0001e000 00:0b 23281359   /lib/
b6f51000-b6f52000 rwxp 0001f000 00:0b 23281359   /lib/
beea1000-beec2000 rw-p 00000000 00:00 0          [stack]...