ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

ThumbEE
Assembler syntax
LDR , [{, #}]
where:
See Standard assembler syntax fields on page A8-7.
The destination register.
The base register. This register is:
R9 for encoding E1
R10 for encoding E2
any of R0-R7 for encoding E3.
The immediate offset used to form the address. Values are multiples of 4 in the range:
0-252 encoding E1
0-124 encoding E2
–28-0 encoding E3.
can be omitted, meaning an offset of 0.
Operation
if ConditionPassed() then
EncodingSpecificOperations(); NullCheckIfThumbEE(n);
address = if add then (R[n] + imm32) else (R[n] - imm32);
R[t] = MemU[address,4];
Exceptions and checks
Data Abort, NullCheck.
A9-20 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B