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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
Using scatter files
About scatter-loading
When to use scatter-loading
Scatter-loading command-line option
Images with a simple memory map
Images with a complex memory map
Linker-defined symbols that are not defined when s
Specifying stack and heap using the scatter file
What is a root region?
Creating root execution regions
Using the FIXED attribute to create root regions
Placing functions and data at specific addresses
Placing a named section explicitly using scatter-l
Placing unassigned sections with the .ANY module s
Examples of using placement algorithms for .ANY se
Example of next_fit algorithm showing behavior of
Examples of using sorting algorithms for .ANY sect
Selecting veneer input sections in scatter-loading
Using __attribute__((section("name"))) t
Using __at sections to place sections at a specifi
Restrictions on placing __at sections
Automatic placement of __at sections
Manual placement of __at sections
Placing a key in flash memory using __at
Placing a structure over a peripheral register usi
Placement of sections with overlays
About placing ARM C and C++ library code
Example of placing code in a root region
Example of placing ARM C library code
Example of placing ARM C++ library code
Example of placing ARM library helper functions
Reserving an empty region
About creating regions on page boundaries
Overalignment of execution regions and input secti
Using preprocessing commands in a scatter file
Expression evaluation in scatter files
Using expression evaluation in a scatter file to a
Equivalent scatter-loading descriptions for simple
Type 1 image, one load region and contiguous execu
Type 2 image, one load region and non-contiguous e
Type 3 image, two load regions and non-contiguous
Scatter file to ELF mapping
Expression evaluation in scatter files
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| Home > Using scatter files > Expression evaluation in scatter files | |||
The linker can carry out simple expression evaluation with
a restricted set of operators, The operators are +, -, *, /, AND, OR,
and parentheses. The implementation of OR and AND follows
C operator precedence rules.
Example of using expression evaluationUse the directives:
#define BASE_ADDRESS 0x8000 #define ALIAS_NUMBER 0x2 #define ALIAS_SIZE 0x400 #define AN_ADDRESS (BASE_ADDRESS+(ALIAS_NUMBER*ALIAS_SIZE))
The scatter file might contain:
LOAD_FLASH AN_ADDRESS ; start address
After preprocessing, this evaluates to:
LOAD_FLASH ( 0x8000 + ( 0x2 * 0x400 )) ; start address
After evaluation, the linker parses the scatter file to produce the load region:
LOAD_FLASH 0x8800 ; start address
| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0377D |
| Non-Confidential | ID062912 |
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