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Assembler User Guide
Preface
Overview of the Assembler
Overview of the ARM Architecture
Structure of Assembly Language Modules
Writing ARM Assembly Language
Condition Codes
Using the Assembler
Symbols, Literals, Expressions, and Operators
Symbol naming rules
Variables
Numeric constants
Assembly time substitution of variables
Register-relative and PC-relative expressions
Labels
Labels for PC-relative addresses
Labels for register-relative addresses
Labels for absolute addresses
Numeric local labels
Syntax of numeric local labels
String expressions
String literals
Numeric expressions
Syntax of numeric literals
Syntax of floating-point literals
Logical expressions
Logical literals
Unary operators
Binary operators
Multiplicative operators
String manipulation operators
Shift operators
Addition, subtraction, and logical operators
Relational operators
Boolean operators
Operator precedence
Difference between operator precedence in assembly
VFP Programming
Assembler Command-line Options
ARM and Thumb Instructions
VFP Instructions
Directives Reference
Via File Syntax
Labels
| Non-Confidential |  PDF version | ARM DUI0379H | ||
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| Home > Symbols, Literals, Expressions, and Operators > Labels | ||||
7.6 Labels
A label is a symbol that represents the memory address of an instruction or data.
The address can be PC-relative, register-relative, or absolute. Labels are local to the
source file unless you make them global using the
EXPORT directive.The address given by a label is calculated during assembly.
armasm calculates the address of a label relative to the origin of the
section where the label is defined. A reference to a label within the same section can use
the PC plus or minus an offset. This is called PC-relative
addressing.
Addresses of labels in other sections are calculated at link
time, when the linker has allocated specific locations in memory
for each section.
Related concepts
| Non-Confidential | PDF version | ARM DUI0379H |
| Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved. |
| Home > Symbols, Literals, Expressions, and Operators > Labels |
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