4.13.1. ADRL pseudo-instruction

Load a program-relative or register-relative address into a register. It is similar to the ADR instruction. ADRL can load a wider range of addresses than ADR because it generates two data processing instructions.

Note

ADRL is not available when assembling Thumb instructions for pre-Thumb-2 processors.

Syntax

ADRL{cond} Rd,label

where:

cond

is an optional condition code (see Conditional execution).

Rd

is the register to load.

label

is a program-relative or register-relative expression. See Register‑relative and program‑relative expressions for more information.

Usage

ADRL always assembles to two 32-bit instructions. Even if the address can be reached in a single instruction, a second, redundant instruction is produced.

If the assembler cannot construct the address in two instructions, it generates an error message and the assembly fails. See LDR pseudo‑instruction for information on loading a wider range of addresses (see also Loading constants into registers).

ADRL produces position-independent code, because the address is program-relative or register-relative.

If label is program-relative, it must evaluate to an address in the same assembler area as the ADRL pseudo-instruction, see AREA.

If you use ADRL to generate a target for a BX or BLX instruction, it is your responsibility to set the Thumb bit (bit 0) of the address if the target contains Thumb instructions.

Architectures and range

The available range depends on the instruction set in use:

ARM

±64KB to a byte or halfword-aligned address.

±256KB bytes to a word-aligned address.

32-bit Thumb

±1MB bytes to a byte, halfword, or word-aligned address.

16-bit Thumb

ADRL is not available.

The given range is relative to a point four bytes (in Thumb code) or two words (in ARM code) after the address of the current instruction. More distant addresses can be in range if the alignment is 16-bytes or more relative to this point.

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