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Return From Exception.


RFE{addr_mode}{cond} Rn{!}



is any one of the following:

Increment address After each transfer (Full Descending stack)
Increment address Before each transfer (A32 only)
Decrement address After each transfer (A32 only)
Decrement address Before each transfer.

If addr_mode is omitted, it defaults to Increment After.


is an optional condition code.


cond is permitted only in T32 code, using a preceding IT instruction, but this is deprecated in Arm®v8. This is an unconditional instruction in A32 code.
specifies the base register. Rn must not be PC.
is an optional suffix. If ! is present, the final address is written back into Rn.


You can use RFE to return from an exception if you previously saved the return state using the SRS instruction. Rn is usually the SP where the return state information was saved.


Loads the PC and the CPSR from the address contained in Rn, and the following address. Optionally updates Rn.


RFE writes an address to the PC. The alignment of this address must be correct for the instruction set in use after the exception return:

  • For a return to A32, the address written to the PC must be word-aligned.
  • For a return to T32, the address written to the PC must be halfword-aligned.
  • For a return to Jazelle, there are no alignment restrictions on the address written to the PC.

No special precautions are required in software to follow these rules, if you use the instruction to return after a valid exception entry mechanism.

Where addresses are not word-aligned, RFE ignores the least significant two bits of Rn.

The time order of the accesses to individual words of memory generated by RFE is not architecturally defined. Do not use this instruction on memory-mapped I/O locations where access order matters.

Do not use RFE in unprivileged software execution.


This instruction is available in A32.

This 32-bit T32 instruction is available, except in the Armv7‑M and Armv8‑M Mainline architectures.

There is no 16-bit version of this instruction.


    RFE sp!