CFSR.py

BFSR_ADDR = "0xE000ed29"
BFSR_LEN = "b"
BFSR_BITS = [
    "IBUSERR",
    "PRECISERR",
    "IMPRECISERR",
    "UNSTKERR",
    "STKERR",
    "LSPERR",
    "Reserved",
    "BFARVALID"
    ]

class CFSR(gdb.Command):
    def __init__(self):
        gdb.Command.__init__(self, "cfsr", gdb.COMMAND_DATA)

    def _get_bits(self, address, length):
        bits = [bit for bit
                in gdb.execute(
                    f"x/{length}t {address}", True, True
                ).split("\t")[1].strip()]
        bits.reverse()
        return bits

    def invoke(self, args, from_tty):
        cmd = str(args).split(" ")
        if cmd[0] == "bfsr":
            bits = self._get_bits(BFSR_ADDR, BFSR_LEN)
            for i in range(len(bits)):
                gdb.write(f"{BFSR_BITS[i]}: {bits[i]}\n")
                gdb.flush()
        return

if __name__ == "__main__":
    CFSR()