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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

Linker User Guide

Selecting veneer input sections in scatter-loading descriptions

Selecting veneer input sections in scatter-loading descriptions

Veneers are used to switch between ARM and Thumb code or to perform a longer program jump than can be specified in a single instruction. You can place veneers at a specific location by including the linker-generated symbol Veneer$$Code in a scatter file. At most, one execution region in the scatter file can have the *(Veneer$$Code) section selector.

If it is safe to do so, the linker places veneer input sections into the region identified by the *(Veneer$$Code) section selector. It might not be possible for a veneer input section to be assigned to the region because of address range problems or execution region size limitations. If the veneer cannot be added to the specified region, it is added to the execution region containing the relocated input section that generated the veneer.

Note

Instances of *(IWV$$Code) in scatter files from earlier versions of ARM tools are automatically translated into *(Veneer$$Code). Use *(Veneer$$Code) in new descriptions.

*(Veneer$$Code) is ignored when the amount of code in an execution region exceeds 4Mb of Thumb code, 16Mb of 32-bit Thumb code, and 32Mb of ARM code.

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