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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 Scatter File Syntax BNF notation used in scatter-loading description s Syntax of a scatter file Load region descriptions Components of a load region description Syntax of a load region description Load region attributes Inheritance rules for load region address attribut Inheritance rules for the RELOC address attribute Considerations when using a relative address +offs Execution region descriptions Components of an execution region description Syntax of an execution region description Execution region attributes Inheritance rules for execution region address att Considerations when using a relative address +offs Input section descriptions Components of an input section description Syntax of an input section description Examples of module and input section specification Expression evaluation in scatter files Expression usage in scatter files Expression rules in scatter files Execution address built-in functions for use in sc ScatterAssert function and load address related fu Symbol related function in a scatter file AlignExpr(expr, align) function GetPageSize() function SizeOfHeaders() function Example of aligning a base address in execution sp Scatter files containing relative base address loa Linker Command-line Options Linker Steering File Command Reference Via File Syntax

Considerations when using a relative address +offset for a load region

8.3.6 Considerations when using a relative address +offset for a load region

There are some considerations to be aware of when using a relative address for a load region.

When using +offset to specify a load region base address:
  • If the +offset load region LR2 follows a load region LR1 containing ZI data, then LR2 overlaps the ZI data. To fix this, use the ImageLimit() function to specify the base address of LR2.
  • A +offset load region LR2 inherits the attributes of the load region LR1 immediately before it, unless:
    • LR1 has the OVERLAY attribute.
    • LR2 has an explicit attribute set.
    If a load region is unable to inherit an attribute, then it gets the attribute ABSOLUTE.
  • A gap might exist in a ROM image between a +offset load region and a preceding region when the preceding region has RW data compression applied. This is because the linker calculates the +offset based on the uncompressed size of the preceding region. However, this gap disappears when the RW data is decompressed at load time.
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