ARM 学习笔记之15： ELF sections and the AREA directive

最新推荐文章于 2022-10-14 14:17:45 发布

转载最新推荐文章于 2022-10-14 14:17:45 发布 · 503 阅读

文章标签：

#ARM

汇编专栏收录该内容

68 篇文章

订阅专栏

本文介绍了在使用汇编器生成的目标文件中如何通过AREA指令定义不同类型的节区，包括只读代码节和可读写数据节，并探讨了这些节区在最终程序映像中的布局方式。

Object files produced by the assembler are divided into sections. In assembly source code, you use the
AREA directive to mark the start of a section.
ELF sections are independent, named, indivisible sequences of code or data. A single code section is the
minimum required to produce an application.
The output of an assembly or compilation can include:
• One or more code sections. These are usually read-only sections.
• One or more data sections. These are usually read-write sections. They might be zero-initialized (ZI).
The linker places each section in a program image according to section placement rules. Sections that are
adjacent in source files are not necessarily adjacent in the application image
Use the AREA directive to name the section and set its attributes. The attributes are placed after the name,
separated by commas.
You can choose any name for your sections. However, names starting with any non-alphabetic character
must be enclosed in bars, or an AREA name missing error is generated. For example, |1_DataArea|.
The following example defines a single read-only section called A32ex that contains code:
AREA A32ex, CODE, READONLY ; Name this block of code A32ex