Thumb Instruction Reference
ARM DUI 0068B Copyright © 2000, 2001 ARM Limited. All r ights reserved. 5-13
5.1.5 LDMIA and STMIA
Load and store multiple registers.
Syntax
op Rn!, {reglist}
where:
op
is either:
LDMIA
Load multiple, incr ement after
STMIA
Store multiple, increment after.
Rn
is the register containing the base address.
Rn
must be in the range
r0
-
r7
.
reglist
is a comma-separated list o f low registers or low-register ranges .
Note
The braces in the syntax description are part of the instruction format.
They do not indicate that the register list is optional.
There must be at least one register in the list.
Usage
Registers are loaded s tored and in numerica l order, with the lowest numbered register
at the address initially in
Rn
.
The value in
Rn
is incremented by 4 times the number of registers in
reglist
.
If
Rn
is in
reglist
:
•for an
LDMIA
instruction, the final value of
Rn
is the value loaded, not the
incremented address
•for an
STMIA
instruction, the value stored for
Rn
is:
—the initial value of
Rn
if
Rn
is the lowest-numbered register in
reglist
—unpredictable otherwise.
Architectures
These instructions are available in all T variants of the ARM architecture.