ARM VERSION 1.2 User Manual
Page 204
Thumb Instruction Reference
5-10
Copyright © 2000, 2001 ARM Limited. All rights reserved.
ARM DUI 0068B
If your system does not have a system coprocessor (cp15), or alignment checking is
disabled:
•
A non-aligned load corrupts
Rd
.
•
A non-aligned save corrupts four bytes in memory. The corrupted location in
memory is [address AND NOT b11].
Architectures
These instructions are available in all T variants of the ARM architecture.
Examples
LDR r2,[pc,#1016]
LDR r5,localdata
LDR r0,[sp,#920]
STR r1,[sp,#20]
Incorrect examples
LDR r13,[pc,#8] ; Rd must be in range r0-r7
STR r7,[pc,#64] ; there is no pc-relative STR instruction
STRH r0,[sp,#16] ; there are no pc- or sp-relative
; halfword or byte transfers
LDR r2,[pc,#81] ; immediate must be a multiple of four
LDR r1,[pc,#-24] ; immediate must not be negative
STR r1,[sp,#1024] ; maximum immediate value is 1020