scripts/gdb: add io resource readers

        gdb.write(gdb.parse_and_eval("linux_banner").string())

LxVersion()

# Resource Structure Printers

#  /proc/iomem

#  /proc/ioports

def get_resources(resource, depth):

    while resource:

        yield resource, depth

        child = resource['child']

        if child:

            for res, deep in get_resources(child, depth + 1):

                yield res, deep

        resource = resource['sibling']

def show_lx_resources(resource_str):

        resource = gdb.parse_and_eval(resource_str)

        width = 4 if resource['end'] < 0x10000 else 8

        # Iterate straight to the first child

        for res, depth in get_resources(resource['child'], 0):

            start = int(res['start'])

            end = int(res['end'])

            gdb.write(" " * depth * 2 +

                      "{0:0{1}x}-".format(start, width) +

                      "{0:0{1}x} : ".format(end, width) +

                      res['name'].string() + "\n")

class LxIOMem(gdb.Command):

    """Identify the IO memory resource locations defined by the kernel

Equivalent to cat /proc/iomem on a running target"""

    def __init__(self):

        super(LxIOMem, self).__init__("lx-iomem", gdb.COMMAND_DATA)

    def invoke(self, arg, from_tty):

        return show_lx_resources("iomem_resource")

LxIOMem()

class LxIOPorts(gdb.Command):

    """Identify the IO port resource locations defined by the kernel

Equivalent to cat /proc/ioports on a running target"""

    def __init__(self):

        super(LxIOPorts, self).__init__("lx-ioports", gdb.COMMAND_DATA)

    def invoke(self, arg, from_tty):

        return show_lx_resources("ioport_resource")

LxIOPorts()