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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

Inheritance rules for load region address attributes

8.3.4 Inheritance rules for load region address attributes

A load region can inherit the attributes of a previous load region.

For a load region to inherit the attributes of a previous load region, specify a +offset base address for that region. A load region cannot inherit attributes if:
  • You explicitly set the attribute of that load region.
  • The load region immediately before has the OVERLAY attribute.
You can explicitly set a load region with the ABSOLUTE, PI, RELOC, or OVERLAY address attributes.
The following inheritance rules apply when no address attribute is specified:
  • The OVERLAY attribute cannot be inherited. A region with the OVERLAY attribute cannot inherit.
  • A base address load or execution region always defaults to ABSOLUTE.
  • A +offset load region inherits the address attribute from the previous load region or ABSOLUTE if no previous load region exists.

Example

This example shows the inheritance rules for setting the address attributes of load regions:
LR1 0x8000 PI
{
    …
}
LR2 +0             ; LR2 inherits PI from LR1
{
    …
}
LR3 0x1000         ; LR3 does not inherit because it has no relative base
                     address, gets default of ABSOLUTE
{
    …
}
LR4 +0             ; LR4 inherits ABSOLUTE from LR3
{
    …
}
LR5 +0 RELOC       ; LR5 does not inherit because it explicitly sets RELOC
{
    …
}
LR6 +0 OVERLAY     ; LR6 does not inherit, an OVERLAY cannot inherit
{
    …
}
LR7 +0             ; LR7 cannot inherit OVERLAY, gets default of ABSOLUTE
{
    …
}
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