 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 fromelfSection placement
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The linker sorts all the input sections within a region according to their attributes. Input sections with identical attributes form a contiguous block within the region.
The base address of each input section is determined by the sorting order defined by the linker, and is correctly aligned within the output section that contains it.
In general, the linker sorts the input sections in the following order when generating an image:
By attribute.
By input section name.
By their positions in the input list, except where overridden by
FIRSTorLAST. See Using FIRST and LAST to place sections.
Note
This sorting order is unaffected by ordering within scatter‑files or object file names.
If an execution region contains 4MB of Thumb code, 16MB of Thumb-2 code or more than 32MB of ARM code, the linker might change the sort order to reduce the number of long branch veneers to a minimum. SeeVeneer generation for more information.
By default, the linker creates an image consisting of an RO, an RW, and optionally a ZI output section. The RO output section can be protected at runtime on systems that have memory management hardware. RO sections can also be placed into ROM in the target.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0377A |
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