MOV32 pseudo--instruction

Load a register with either:

MOV32 always generates two 32-bit instructions, a MOV, MOVT pair. This enables you to load any 32-bit immediate, or to access the whole 32-bit address space.

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MOV32{cond} Rd, expr

where:

cond

is an optional condition code.

Rd

is the register to be loaded. Rd must not be SP or PC.

expr

can be any one of the following:

symbol

A label in this or another program area.

#constant

Any 32-bit immediate value.

symbol + constant

A label plus a 32-bit immediate value.

Show/hideUsage

The main purposes of the MOV32 pseudo-instruction are:

  • To generate literal constants when an immediate value cannot be generated in a single instruction.

  • To load a PC-relative or external address into a register. The address remains valid regardless of where the linker places the ELF section containing the MOV32.

    Note

    An address loaded in this way is fixed at link time, so the code is not position-independent.

MOV32 sets the Thumb bit (bit 0) of the address if the label referenced is in Thumb code.

Show/hideArchitectures

This pseudo-instruction is available in ARMv6T2 and above in both ARM and Thumb.

Show/hideExamples

     MOV32 r3, #0xABCDEF12   ; loads 0xABCDEF12 into R3
     MOV32 r1, Trigger+12    ; loads the address that is 12 bytes higher than
                             ; the address Trigger into R1

Show/hideSee also

Reference:
Copyright © 2010-2011 ARM. All rights reserved.ARM DUI 0489E
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