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RealView Linker and Utilities Guide
Preface Introduction The Linker Command Syntax Using the Basic Linker Functionality Accessing Image Symbols Using Scatter-loading Description Files About scatter-loading
Symbols defined for scatter-loading Specifying stack and heap using the scatter-loadin When to use scatter-loading Scatter-loading command-line option Images with a simple memory map Images with a complex memory map Formal syntax of the scatter-loading description f BNF notation and syntax Overview of the syntax of scatter-loading descript Load region description Execution region description Input section description Resolving multiple matches Resolving path names Expression evaluation in scatter-loading files Examples of specifying region and section addresse Selecting veneer input sections in scatter-loading Creating root execution regions Placing regions at fixed addresses Using overlays to place sections Assigning sections to a root region Reserving an empty region Placing ARM libraries Creating regions on page boundaries Using preprocessing directives Equivalent scatter-loading descriptions for simple Type 1, one load region and contiguous execution r Type 2, one load region and non contiguous executi Type 3, two load regions and non contiguous execut Using the ARM Librarian Using fromelfBNF notation and syntax
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| Home > Using Scatter-loading Description Files > Formal syntax of the scatter-loading description file > BNF notation and syntax | |||
Table 5.1 summarizes the Backus-Naur Form (BNF) symbols that are used to describe a formal language.
Table 5.1. BNF syntax
| Symbol | Description |
|---|---|
" | Quotation marks are used to indicate that a character that is normally part of the BNF syntax is used as a literal character in the definition. The definition B"+"C, for example, can only be replaced by the pattern B+C. The definition B+C can be replaced by, for example, patterns BC, BBC, or BBBC. |
A ::= B | Defines A as B. For example, A::= B"+" | C means that A is equivalent to either B+ or C. The ::= notation is used to define a higher level construct in terms of its components. Each component might also have a ::= definition that defines it in terms of even simpler components. For example, A::= B and B::= C | D means that the definition A is equivalent to the patterns C or D. |
[A] | Optional element A. For example, A::= B[C]D means that the definition BD or BCD. |
A+ | Element A can have one or more occurrences. For example, A::= B+ means that the definition B, BB, or BBB. |
A* | Element A can have zero or more occurrences. |
A | B | Either element A or B can occur, but not both. |
(A B) | Element A and B are grouped together. This is particularly useful when the | operator is used or when a complex pattern is repeated. For example, A::=(B C)+ (D | E) means that the definition BCD, BCE, BCBCD, BCBCE, BCBCBCD, or BCBCBCE. |
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0377A |
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