ARM VERSION 1.2 - Manual (Page 234)

Thumb Instruction Reference
5-40 Copyright © 2000, 2001 ARM Limited. All rights reserved. ARM DUI 0068B
5.6.1 ADR Thumb pseudo-instruction
The ADR pseudo-instruction loads a program-relative address into a register.
Syntax
ADR register, expr
where:
register is the register to load.
expr is a program-relative expression. The offset must be positive and less than
1KB.
expr must be defined locally, it cannot be imported.
Usage
In Thumb state, ADR can generate word-aligned addresses only. Use the ALIGN directive
to ensure that expr is aligned (see ALIGN on page 7-50).
expr must evaluate to an address in the same code section as the ADR pseudo-instruction.
There is no guarantee that the address will be within range after linking if it resides in
another ELF section.
Example
ADR r4,txampl ; => ADD r4,pc,#nn
; code
ALIGN
txampl DCW 0,0,0,0