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Technical Support
On-Line Manuals
Linker User Guide
Preface
Overview of the Linker
Linking Models Supported by armlink
Image Structure and Generation
Linker Optimization Features
Getting Image Details
Accessing and Managing Symbols with armlink
About mapping symbols
Linker-defined symbols
Region-related symbols
Types of region-related symbols
Image$$ execution region symbols
Load$$ execution region symbols
Load$$LR$$ load region symbols
Region name values when not scatter-loading
Linker defined symbols and scatter files
Methods of importing linker-defined symbols in C a
Methods of importing linker-defined symbols in ARM
Section-related symbols
Types of section-related symbols
Image symbols
Input section symbols
Access symbols in another image
Creating a symdefs file
Outputting a subset of the global symbols
Reading a symdefs file
Symdefs file format
Edit the symbol tables with a steering file
Specifying steering files on the linker command-li
Steering file command summary
Steering file format
Hide and rename global symbols with a steering fil
Use of $Super$$ and $Sub$$ to patch symbol definit
Scatter-loading Features
Scatter File Syntax
Linker Command-line Options
Linker Steering File Command Reference
Via File Syntax
Linker-defined symbols
| Non-Confidential |  PDF version | ARM DUI0377H | ||
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| Home > Accessing and Managing Symbols with armlink > Linker-defined symbols | ||||
6.2 Linker-defined symbols
The linker defines some symbols that are reserved by ARM®, and that you can access if required.
Symbols that contain the character sequence
$$, and all other external names containing the sequence $$, are names reserved by ARM.You can import these symbolic addresses and use them as relocatable addresses by your
assembly language programs, or refer to them as
extern symbols
from your C or C++ source code.Be aware that:
- If you use the
--strictcompiler command-line option, the compiler does not accept symbol names containing dollar symbols. To re-enable support, include the--dollaroption on the compiler command line. - Linker-defined symbols are only generated when your code references them.
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If execute-only (XO) sections are present, linker-defined symbols are defined with the following constraints:
- XO linker defined symbols cannot be defined with respect to an empty region or a region that has no XO sections.
- XO linker defined symbols cannot be defined with respect to a region that contains only RO sections.
- RO linker defined symbols cannot be defined with respect to a region that contains only XO sections.
Related concepts
| Non-Confidential | PDF version | ARM DUI0377H |
| Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved. |
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