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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
Reading a symdefs file
| Non-Confidential |  PDF version | ARM DUI0377H | ||
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6.5.3 Reading a symdefs file
A symdefs file can be considered as an object file with symbol information but no code or data.
To read a symdefs file, add it to your file list as you do for any object file. The linker
reads the file and adds the symbols and their values to the output symbol table. The added
symbols have
ABSOLUTE and GLOBAL attributes.If a partial link is being performed, the symbols are added to the output object symbol
table. If a full link is being performed, the symbols are added to the image symbol table.
The linker generates error messages for invalid rows in the file. A row is invalid if:
-
Any of the columns are missing.
- Any of the columns have invalid values.
The symbols extracted from a symdefs file are treated in exactly the same way as symbols
extracted from an object symbol table. The same restrictions apply regarding multiple symbol
definitions.
Note
The same function name or symbol name cannot be defined in both ARM code and in Thumb code.Related reference
| Non-Confidential | PDF version | ARM DUI0377H |
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