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On-Line Manuals
Linker User Guide
Conventions and feedback
Overview of the linker
Linking models supported by armlink
Image structure and generation
Using linker optimizations
Getting information about images
Accessing and managing symbols with armlink
About mapping symbols
Accessing linker-defined symbols
Region-related symbols
Image$$ execution region symbols
Load$$ execution region symbols
Load$$LR$$ load region symbols
Region name values when not scatter-loading
Using scatter files
Importing linker-defined symbols in C and C++
Importing linker-defined symbols in ARM assembler
Section-related symbols
Image symbols
Input section symbols
Accessing symbols in another image
Creating a symdefs file
Outputting a subset of the global symbols
Reading a symdefs file
Symdefs file format
What is a steering file?
Specifying steering files on the linker command-li
Steering file command summary
Steering file format
Hiding and renaming global symbols with a steering
Using $Super$$ and $Sub$$ to patch symbol definiti
Using scatter files
Linker User Guide
Importing linker-defined symbols in C and C++
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| Home > Accessing and managing symbols with armlink > Importing linker-defined symbols in C and C++ | |||
You can import linker-defined symbols into your C or C++ source code either by value or by reference:
- Import by value
extern unsigned int symbol_name;- Import by reference
extern void *symbol_name;
If you declare a symbol as an int, then
you must use the address-of operator (&)
to obtain the correct value as shown in these examples:
Example 3. Importing a linker-defined symbol
extern unsigned int Image$$ZI$$Limit; config.heap_base = (unsigned int) &Image$$ZI$$Limit;
Example 4. Importing symbols that define a ZI output section
extern unsigned int Image$$ZI$$Length; extern char Image$$ZI$$Base[]; memset(Image$$ZI$$Base,0,(unsigned int)&Image$$Length);
See also- Concepts
| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0377D |
| Non-Confidential | ID062912 |
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| Home > Accessing and managing symbols with armlink > Importing linker-defined symbols in C and C++ |
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