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Directives Reference
MOV32 pseudo--instruction
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| Home > ARM and Thumb Instructions > MOV32 pseudo--instruction | |||
Load a register with either:
a 32-bit immediate value
any address.
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.
SyntaxMOV32{cond}Rd,expr
where:
condis an optional condition code.
Rdis the register to be loaded.
Rdexprcan be any one of the following:
symbolA label in this or another program area.
#constantAny 32-bit immediate value.
symbol+constantA label plus a 32-bit immediate value.
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.
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
- Reference
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| Non-Confidential | ID062912 |
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