Arm VERSION 1.2 Manual do Utilizador descarregar pdf (Página 207)

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Thumb Instruction Reference

5.1.5 LDMIA and STMIA

Load and store multiple registers.

Syntax

op Rn!, {reglist}

where:

is either:

LDMIA

Load multiple, increment after

STMIA

Store multiple, increment after.

is the register containing the base address.

must be in the range

reglist

is a comma-separated list of 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 stored and in numerical order, with the lowest numbered register

at the address initially in

The value in

is incremented by 4 times the number of registers in

reglist

is in

reglist

• for an

LDMIA

instruction, the final value of

is the value loaded, not the

incremented address

• for an

STMIA

instruction, the value stored for

is:

— the initial value of

is the lowest-numbered register in

reglist

— unpredictable otherwise.

Architectures

These instructions are available in all T variants of the ARM architecture.

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