scottt / qemu-armv7a-cp15

Accessing ARMv7a CP15 registers in GDB and QEMU

This project demonstrates accessing ARMv7 CP15 registers under GDB and QEMU. It's accomplished by calling helper functions with the necessary code sequence interactively in GDB.

To build the code

• Edit armv7-linaro.env to point to your ARMv7 cross compiler
• Run:

$ . armv7-linaro.env
$ make

To run the code under the QEMU emulator:

$ make qemu

In a separate terminal:

$ make gdb

Try calling the following functions interactively in GDB:

(gdb) p/x cr_get()
(gdb) p/x auxcr_get()
(gdb) p/x cpuid_get()

See cp15.h and cp15.c for more details.