This script will give you the list of ARM system instructions used in your IDA database. This is useful for locating specific low-level pieces of code (setting up the MMU, caches, fault handlers, etc.).
One hassle of reverse engineering low-level ARM code is that IDA Pro does not
decode the internal registers accessed by co-processor instructions
(MCR
/MRC
and MSR
/MRS
on AArch64).
After applying the script, the system registers accessed will be automatically commented in the database, as defined in the official ARM reference manuals.
Alt-F7
in IDA Pro, then run the script on your open database.
Should work with ARMv7 and ARMv8 processors.