 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 fromelfLoad view and execution view of an image
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Image regions are placed in the system memory map at load time. Before you can execute the image, you might have to move some of its regions to their execution addresses and create the ZI output sections. For example, initialized RW data might have to be copied from its load address in ROM to its execution address in RAM.
The memory map of an image has the following distinct views (as shown in Figure 3.2).
- Load view
Describes each image region and section in terms of the address it is located at when the image is loaded into memory, that is, the location before the image starts executing.
- Execution view
Describes each image region and section in terms of the address it is located at while the image is executing.
Table 3.1 compares the load and execution views.
Table 3.1. Comparing load and execution views
| Load | Description | Execution | Description |
|---|---|---|---|
| Load address | The address where a section or region is loaded into memory before the image containing it starts executing. The load address of a section or a non root region can differ from its execution address | Execution address | The address where a section or region is located while the image containing it is being executed |
| Load region | A region in the load address space | Execution region | A region in the execution address space |
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0377A |
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