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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

AlignExpr(expr, align) function

8.6.6 AlignExpr(expr, align) function

Aligns an address expression to a specified boundary.

This function returns:
(expr + (align-1)) & ~(align-1))
Where:
  • expr is a valid address expression.
  • align is the alignment, and must be a positive power of 2.
It increases expr until:
expr ≡ 0 (mod align)

Example

This example aligns the address of ER2 on an 8-byte boundary:
ER +0
{
    …
}
ER2 AlignExpr(+0x8000,8)
{
    …
}

Relationship with the ALIGN keyword

The following relationship exists between ALIGN and AlignExpr:
ALIGN keyword
Load and execution regions already have an ALIGN keyword:
  • For load regions the ALIGN keyword aligns the base of the load region in load space and in the file to the specified alignment.
  • For execution regions the ALIGN keyword aligns the base of the execution region in execution and load space to the specified alignment.
AlignExpr
Aligns the expression it operates on, but has no effect on the properties of the load or execution region.
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