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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 Scatter-loading Features The scatter-loading mechanism Overview of scatter-loading When to use scatter-loading Linker-defined symbols that are not defined when s Specifying stack and heap using the scatter file Scatter-loading command-line options Scatter-loading images with a simple memory map Scatter-loading images with a complex memory map Scatter file with link to bit-band objects Root execution regions Root execution region and the initial entry point Root execution regions and the ABSOLUTE attribute Root execution regions and the FIXED attribute Methods of placing functions and data at specific Placement of code and data with __attribute__((sec Placement of __at sections at a specific address Restrictions on placing __at sections Automatic placement of __at sections Manual placement of __at sections Placement of a key in flash memory with an __at se Mapping a structure over a peripheral register wit Example of how to explicitly place a named section Placement of unassigned sections with the .ANY mod Placement rules when using multiple .ANY selectors Command-line options for controlling the placement Prioritization of .ANY sections Specify the maximum region size permitted for plac Examples of using placement algorithms for .ANY se Example of next_fit algorithm showing behavior of Examples of using sorting algorithms for .ANY sect Behavior when .ANY sections overflow because of li Placement of veneer input sections in a scatter fi Placement of sections with overlays Reserving an empty region Placement of ARM C and C++ library code Specifying ARM standard C and C++ libraries in a s 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 Creation of regions on page boundaries Overalignment of execution regions and input secti Preprocessing of a scatter file Example of using expression evaluation in a scatte Equivalent scatter-loading descriptions for simple Command-line options for creating simple images Type 1 image, one load region and contiguous execu Type 2 image, one load region and non-contiguous e Type 3 image, multiple load regions and non-contig How the linker resolves multiple matches when proc How the linker resolves path names when processing Scatter file to ELF mapping Scatter File Syntax Linker Command-line Options Linker Steering File Command Reference Via File Syntax

Placement rules when using multiple .ANY selectors

7.4.1 Placement rules when using multiple .ANY selectors

The linker has default rules for placing sections when using multiple .ANY selectors.

When more than one .ANY selector is present in a scatter file, the linker sorts sections in descending size order. It then takes the unassigned section with the largest size and assigns the section to the most specific .ANY execution region that has enough free space. For example, .ANY(.text) is judged to be more specific than .ANY(+RO).
If several execution regions are equally specific, then the section is assigned to the execution region with the most available remaining space.
For example:
  • If you have two equally specific execution regions where one has a size limit of 0x2000 and the other has no limit, then all the sections are assigned to the second unbounded .ANY region.
  • If you have two equally specific execution regions where one has a size limit of 0x2000 and the other has a size limit of 0x3000, then the first sections to be placed are assigned to the second .ANY region of size limit 0x3000 until the remaining size of the second .ANY is reduced to 0x2000. From this point, sections are assigned alternately between both .ANY execution regions.
You can specify a maximum amount of space to use for unassigned sections with the execution region attribute ANY_SIZE.
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