 RealView Linker and Utilities Guide | |
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RealView Linker and Utilities Guide
Preface Introduction The Linker Command Syntax Using the Basic Linker Functionality Specifying the image structure
Building blocks for objects and images Load view and execution view of an image Specifying an image memory map Image entry points Section placement Ordering input sections by attribute Using FIRST and LAST to place sections Aligning sections Ordering execution regions containing Thumb code Optimizations and modifications Common debug section elimination Common group or section elimination Unused section elimination Unused function elimination Linker feedback RW data compression PI to absolute veneers Veneer generation Reuse of veneers with overlay execution regions Branch inlining Using command-line options to create simple images Type 1, one load region and contiguous execution r Type 2, one load region and non contiguous executi Type 3, two load regions and non contiguous execut Using command-line options to handle C++ exception Getting information about images Using image-related information Accessing Image Symbols Using Scatter-loading Description Files Using the ARM Librarian Using fromelfBuilding blocks for objects and images
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An executable file is constructed from a hierarchy of images, regions, output sections, and input sections:
An image consists of one or more regions. Each region consists of one or more output sections.
Each output section contains one or more input sections.
Input sections are the code and data information in an object file.
Figure 3.1 shows the relationship between regions, output sections, and input sections.
Figure 3.1 shows the building blocks that make up the image:
- Input sections
An input section contains code or initialized data, or describes a fragment of memory that is not initialized or that must be set to zero before the image can execute. These properties are represented by attributes such as RO, RW and ZI. See Ordering input sections by attribute for more information. These attributes are used by armlink to group input sections into bigger building blocks called output sections and regions.
- Output sections
An output section is a contiguous sequence of input sections that have the same RO, RW, or ZI attribute. An output section has the same attributes as its constituent input sections. Within an output section, the input sections are sorted according to the rules described in Section placement.
- Regions
A region is a contiguous sequence of one, two, or three output sections. The output sections in a region are sorted according to their attributes. The RO output section is first, then the RW output section, and finally the ZI output section. A region typically maps onto a physical memory device, such as ROM, RAM, or peripheral.
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