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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

Examples of using sorting algorithms for .ANY sections

Examples of using sorting algorithms for .ANY sections

These examples show the operation of the sorting algorithms for RO-CODE sections in sections_a.o and sections_b.o.

The input section properties and ordering are shown in the following tables:

Table 12. Input section properties for sections_a.o

NameSize
seca_10x4
seca_20x4
seca_30x10
seca_40x14

Table 13. Input section properties for sections_b.o

NameSize
secb_10x4
secb_20x4
secb_30x10
secb_40x14

Show/hideDescending size example

The following linker command-line options are used for this example:

--any_sort_order=descending_size sections_a.o sections_b.o --scatter scatter.txt

The order that the sections are processed by the .ANY assignment algorithm is:

Table 14. Sort order for descending_size algorithm

NameSize
seca_40x14
secb_40x14
seca_30x10
secb_30x10
seca_10x4
seca_20x4
secb_10x4
secb_20x4

Sections of the same size use the tiebreak specified by --tiebreaker.

Show/hideCommand-line example

The following linker command-line options are used for this example:

--any_sort_order=cmdline sections_a.o sections_b.o --scatter scatter.txt

The order that the sections are processed by the .ANY assignment algorithm is:

Table 15. Sort order for cmdline algorithm

NameSize
seca_10x4
secb_10x4
seca_20x4
secb_20x4
seca_30x10
secb_30x10
seca_40x14
secb_40x14

Sections with the same command-line index use the tiebreak specified by --tiebreaker.

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