Linux Kernel Module Cheat

17.22.1. dump_regs

The following kernel modules and Baremetal executables dump and disassemble various registers which cannot be observed from userland (usually "system registers", "control registers"):

kernel_modules/dump_regs.c
userland/arch/arm/dump_regs.c
userland/arch/aarch64/dump_regs.c
baremetal/arch/arm/dump_regs.c
baremetal/arch/aarch64/dump_regs.c

Some of those programs are using:

lkmc/aarch64_dump_regs.h

Alternatively, you can also get their value from inside GDB step debug with:

info registers all

or the short version:

i r a

or to get just specific registers, e.g. just ARMv8’s SCTLR:

i r SCTLR

but it is sometimes just more convenient to run an executable to get the registers at the point of interest.