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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
Creating a symdefs file
| Non-Confidential |  PDF version | ARM DUI0377H | ||
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| Home > Accessing and Managing Symbols with armlink > Access symbols in another image > Creating a symdefs file | ||||
6.5.1 Creating a symdefs file
You can specify a symdefs file on the linker command-line.
You can use a symdefs file, for example, if you have one image that always resides in ROM
and multiple images that are loaded into RAM. The images loaded into RAM can access global
functions and data from the image located in ROM.
Use the armlink option
--symdefs=filename to generate a symdefs file.The linker produces a symdefs file during a successful final link stage. It is not produced
for partial linking or for unsuccessful final linking.
Note
If
filename does not exist, the linker creates
the file and adds entries for all the global symbols to that file. If
filename exists, the linker uses the existing
contents of filename to select the symbols that
are output when it rewrites the file. This means that only the existing symbols in the
filename are updated, and no new symbols (if any) are added at all. If you do not want
this behavior, ensure that any existing symdefs file is deleted before the link step.| Non-Confidential | PDF version | ARM DUI0377H |
| Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved. |
| Home > Accessing and Managing Symbols with armlink > Access symbols in another image > Creating a symdefs file |
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