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SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

Load PC-relative address.

Syntax

ADR{cond} Rd, label

where:

cond

Rd

is the destination register.

label

.

Operation

ADR determines the address by adding an immediate value to the PC, and writes the result to the destination register.

ADR produces position-independent code, because the address is PC-relative.

If ADR is used to generate a target address for a BX or BLX instruction, ensure that bit[0] of the address generated is set
to 1 for correct execution.

Values of label must be within the range of 

−4095 to +4095 from the address in the PC. 

Note:

The user might have to use the .W suffix to get the maximum offset range or to generate addresses that are not 
word-aligned. See 

Restrictions

Rd must not be SP and must not be PC.

Condition Flags

This instruction does not change the flags.

Examples

ADR     R1, TextMessage   ; Write address value of a location labelled as

                          ; TextMessage to R1