533 lines
18 KiB
Python
533 lines
18 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2016 Google, Inc
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#
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# Base class for all entries
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#
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from __future__ import print_function
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from collections import namedtuple
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# importlib was introduced in Python 2.7 but there was a report of it not
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# working in 2.7.12, so we work around this:
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# http://lists.denx.de/pipermail/u-boot/2016-October/269729.html
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try:
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import importlib
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have_importlib = True
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except:
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have_importlib = False
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import os
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from sets import Set
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import sys
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import fdt_util
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import state
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import tools
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modules = {}
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our_path = os.path.dirname(os.path.realpath(__file__))
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# An argument which can be passed to entries on the command line, in lieu of
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# device-tree properties.
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EntryArg = namedtuple('EntryArg', ['name', 'datatype'])
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class Entry(object):
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"""An Entry in the section
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An entry corresponds to a single node in the device-tree description
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of the section. Each entry ends up being a part of the final section.
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Entries can be placed either right next to each other, or with padding
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between them. The type of the entry determines the data that is in it.
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This class is not used by itself. All entry objects are subclasses of
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Entry.
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Attributes:
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section: Section object containing this entry
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node: The node that created this entry
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offset: Offset of entry within the section, None if not known yet (in
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which case it will be calculated by Pack())
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size: Entry size in bytes, None if not known
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contents_size: Size of contents in bytes, 0 by default
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align: Entry start offset alignment, or None
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align_size: Entry size alignment, or None
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align_end: Entry end offset alignment, or None
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pad_before: Number of pad bytes before the contents, 0 if none
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pad_after: Number of pad bytes after the contents, 0 if none
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data: Contents of entry (string of bytes)
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"""
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def __init__(self, section, etype, node, read_node=True, name_prefix=''):
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self.section = section
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self.etype = etype
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self._node = node
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self.name = node and (name_prefix + node.name) or 'none'
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self.offset = None
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self.size = None
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self.data = None
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self.contents_size = 0
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self.align = None
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self.align_size = None
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self.align_end = None
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self.pad_before = 0
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self.pad_after = 0
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self.offset_unset = False
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self.image_pos = None
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self._expand_size = False
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if read_node:
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self.ReadNode()
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@staticmethod
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def Lookup(section, node_path, etype):
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"""Look up the entry class for a node.
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Args:
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section: Section object containing this node
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node_node: Path name of Node object containing information about
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the entry to create (used for errors)
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etype: Entry type to use
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Returns:
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The entry class object if found, else None
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"""
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# Convert something like 'u-boot@0' to 'u_boot' since we are only
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# interested in the type.
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module_name = etype.replace('-', '_')
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if '@' in module_name:
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module_name = module_name.split('@')[0]
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module = modules.get(module_name)
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# Also allow entry-type modules to be brought in from the etype directory.
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# Import the module if we have not already done so.
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if not module:
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old_path = sys.path
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sys.path.insert(0, os.path.join(our_path, 'etype'))
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try:
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if have_importlib:
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module = importlib.import_module(module_name)
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else:
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module = __import__(module_name)
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except ImportError as e:
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raise ValueError("Unknown entry type '%s' in node '%s' (expected etype/%s.py, error '%s'" %
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(etype, node_path, module_name, e))
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finally:
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sys.path = old_path
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modules[module_name] = module
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# Look up the expected class name
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return getattr(module, 'Entry_%s' % module_name)
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@staticmethod
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def Create(section, node, etype=None):
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"""Create a new entry for a node.
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Args:
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section: Section object containing this node
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node: Node object containing information about the entry to
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create
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etype: Entry type to use, or None to work it out (used for tests)
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Returns:
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A new Entry object of the correct type (a subclass of Entry)
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"""
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if not etype:
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etype = fdt_util.GetString(node, 'type', node.name)
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obj = Entry.Lookup(section, node.path, etype)
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# Call its constructor to get the object we want.
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return obj(section, etype, node)
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def ReadNode(self):
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"""Read entry information from the node
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This reads all the fields we recognise from the node, ready for use.
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"""
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if 'pos' in self._node.props:
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self.Raise("Please use 'offset' instead of 'pos'")
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self.offset = fdt_util.GetInt(self._node, 'offset')
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self.size = fdt_util.GetInt(self._node, 'size')
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self.align = fdt_util.GetInt(self._node, 'align')
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if tools.NotPowerOfTwo(self.align):
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raise ValueError("Node '%s': Alignment %s must be a power of two" %
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(self._node.path, self.align))
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self.pad_before = fdt_util.GetInt(self._node, 'pad-before', 0)
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self.pad_after = fdt_util.GetInt(self._node, 'pad-after', 0)
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self.align_size = fdt_util.GetInt(self._node, 'align-size')
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if tools.NotPowerOfTwo(self.align_size):
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raise ValueError("Node '%s': Alignment size %s must be a power "
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"of two" % (self._node.path, self.align_size))
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self.align_end = fdt_util.GetInt(self._node, 'align-end')
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self.offset_unset = fdt_util.GetBool(self._node, 'offset-unset')
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self.expand_size = fdt_util.GetBool(self._node, 'expand-size')
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def GetDefaultFilename(self):
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return None
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def GetFdtSet(self):
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"""Get the set of device trees used by this entry
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Returns:
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Set containing the filename from this entry, if it is a .dtb, else
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an empty set
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"""
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fname = self.GetDefaultFilename()
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# It would be better to use isinstance(self, Entry_blob_dtb) here but
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# we cannot access Entry_blob_dtb
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if fname and fname.endswith('.dtb'):
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return Set([fname])
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return Set()
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def ExpandEntries(self):
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pass
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def AddMissingProperties(self):
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"""Add new properties to the device tree as needed for this entry"""
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for prop in ['offset', 'size', 'image-pos']:
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if not prop in self._node.props:
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state.AddZeroProp(self._node, prop)
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err = state.CheckAddHashProp(self._node)
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if err:
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self.Raise(err)
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def SetCalculatedProperties(self):
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"""Set the value of device-tree properties calculated by binman"""
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state.SetInt(self._node, 'offset', self.offset)
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state.SetInt(self._node, 'size', self.size)
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state.SetInt(self._node, 'image-pos',
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self.image_pos - self.section.GetRootSkipAtStart())
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state.CheckSetHashValue(self._node, self.GetData)
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def ProcessFdt(self, fdt):
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"""Allow entries to adjust the device tree
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Some entries need to adjust the device tree for their purposes. This
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may involve adding or deleting properties.
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Returns:
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True if processing is complete
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False if processing could not be completed due to a dependency.
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This will cause the entry to be retried after others have been
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called
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"""
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return True
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def SetPrefix(self, prefix):
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"""Set the name prefix for a node
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Args:
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prefix: Prefix to set, or '' to not use a prefix
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"""
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if prefix:
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self.name = prefix + self.name
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def SetContents(self, data):
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"""Set the contents of an entry
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This sets both the data and content_size properties
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Args:
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data: Data to set to the contents (string)
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"""
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self.data = data
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self.contents_size = len(self.data)
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def ProcessContentsUpdate(self, data):
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"""Update the contens of an entry, after the size is fixed
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This checks that the new data is the same size as the old.
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Args:
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data: Data to set to the contents (string)
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Raises:
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ValueError if the new data size is not the same as the old
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"""
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if len(data) != self.contents_size:
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self.Raise('Cannot update entry size from %d to %d' %
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(len(data), self.contents_size))
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self.SetContents(data)
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def ObtainContents(self):
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"""Figure out the contents of an entry.
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Returns:
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True if the contents were found, False if another call is needed
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after the other entries are processed.
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"""
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# No contents by default: subclasses can implement this
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return True
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def Pack(self, offset):
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"""Figure out how to pack the entry into the section
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Most of the time the entries are not fully specified. There may be
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an alignment but no size. In that case we take the size from the
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contents of the entry.
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If an entry has no hard-coded offset, it will be placed at @offset.
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Once this function is complete, both the offset and size of the
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entry will be know.
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Args:
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Current section offset pointer
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Returns:
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New section offset pointer (after this entry)
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"""
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if self.offset is None:
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if self.offset_unset:
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self.Raise('No offset set with offset-unset: should another '
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'entry provide this correct offset?')
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self.offset = tools.Align(offset, self.align)
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needed = self.pad_before + self.contents_size + self.pad_after
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needed = tools.Align(needed, self.align_size)
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size = self.size
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if not size:
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size = needed
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new_offset = self.offset + size
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aligned_offset = tools.Align(new_offset, self.align_end)
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if aligned_offset != new_offset:
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size = aligned_offset - self.offset
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new_offset = aligned_offset
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if not self.size:
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self.size = size
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if self.size < needed:
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self.Raise("Entry contents size is %#x (%d) but entry size is "
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"%#x (%d)" % (needed, needed, self.size, self.size))
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# Check that the alignment is correct. It could be wrong if the
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# and offset or size values were provided (i.e. not calculated), but
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# conflict with the provided alignment values
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if self.size != tools.Align(self.size, self.align_size):
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self.Raise("Size %#x (%d) does not match align-size %#x (%d)" %
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(self.size, self.size, self.align_size, self.align_size))
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if self.offset != tools.Align(self.offset, self.align):
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self.Raise("Offset %#x (%d) does not match align %#x (%d)" %
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(self.offset, self.offset, self.align, self.align))
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return new_offset
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def Raise(self, msg):
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"""Convenience function to raise an error referencing a node"""
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raise ValueError("Node '%s': %s" % (self._node.path, msg))
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def GetEntryArgsOrProps(self, props, required=False):
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"""Return the values of a set of properties
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Args:
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props: List of EntryArg objects
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Raises:
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ValueError if a property is not found
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"""
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values = []
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missing = []
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for prop in props:
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python_prop = prop.name.replace('-', '_')
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if hasattr(self, python_prop):
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value = getattr(self, python_prop)
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else:
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value = None
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if value is None:
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value = self.GetArg(prop.name, prop.datatype)
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if value is None and required:
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missing.append(prop.name)
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values.append(value)
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if missing:
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self.Raise('Missing required properties/entry args: %s' %
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(', '.join(missing)))
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return values
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def GetPath(self):
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"""Get the path of a node
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Returns:
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Full path of the node for this entry
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"""
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return self._node.path
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def GetData(self):
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return self.data
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def GetOffsets(self):
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return {}
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def SetOffsetSize(self, pos, size):
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self.offset = pos
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self.size = size
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def SetImagePos(self, image_pos):
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"""Set the position in the image
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Args:
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image_pos: Position of this entry in the image
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"""
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self.image_pos = image_pos + self.offset
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def ProcessContents(self):
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pass
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def WriteSymbols(self, section):
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"""Write symbol values into binary files for access at run time
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Args:
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section: Section containing the entry
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"""
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pass
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def CheckOffset(self):
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"""Check that the entry offsets are correct
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This is used for entries which have extra offset requirements (other
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than having to be fully inside their section). Sub-classes can implement
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this function and raise if there is a problem.
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"""
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pass
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@staticmethod
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def GetStr(value):
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if value is None:
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return '<none> '
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return '%08x' % value
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@staticmethod
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def WriteMapLine(fd, indent, name, offset, size, image_pos):
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print('%s %s%s %s %s' % (Entry.GetStr(image_pos), ' ' * indent,
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Entry.GetStr(offset), Entry.GetStr(size),
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name), file=fd)
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def WriteMap(self, fd, indent):
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"""Write a map of the entry to a .map file
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Args:
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fd: File to write the map to
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indent: Curent indent level of map (0=none, 1=one level, etc.)
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"""
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self.WriteMapLine(fd, indent, self.name, self.offset, self.size,
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self.image_pos)
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def GetEntries(self):
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"""Return a list of entries contained by this entry
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Returns:
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List of entries, or None if none. A normal entry has no entries
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within it so will return None
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"""
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return None
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def GetArg(self, name, datatype=str):
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"""Get the value of an entry argument or device-tree-node property
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Some node properties can be provided as arguments to binman. First check
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the entry arguments, and fall back to the device tree if not found
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Args:
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name: Argument name
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datatype: Data type (str or int)
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Returns:
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Value of argument as a string or int, or None if no value
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Raises:
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ValueError if the argument cannot be converted to in
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"""
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value = state.GetEntryArg(name)
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if value is not None:
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if datatype == int:
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try:
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value = int(value)
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except ValueError:
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self.Raise("Cannot convert entry arg '%s' (value '%s') to integer" %
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(name, value))
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elif datatype == str:
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pass
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else:
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raise ValueError("GetArg() internal error: Unknown data type '%s'" %
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datatype)
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else:
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value = fdt_util.GetDatatype(self._node, name, datatype)
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return value
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@staticmethod
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def WriteDocs(modules, test_missing=None):
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"""Write out documentation about the various entry types to stdout
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Args:
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modules: List of modules to include
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test_missing: Used for testing. This is a module to report
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as missing
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"""
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print('''Binman Entry Documentation
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===========================
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This file describes the entry types supported by binman. These entry types can
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be placed in an image one by one to build up a final firmware image. It is
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fairly easy to create new entry types. Just add a new file to the 'etype'
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directory. You can use the existing entries as examples.
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Note that some entries are subclasses of others, using and extending their
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features to produce new behaviours.
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''')
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modules = sorted(modules)
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# Don't show the test entry
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if '_testing' in modules:
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modules.remove('_testing')
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missing = []
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for name in modules:
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module = Entry.Lookup(name, name, name)
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docs = getattr(module, '__doc__')
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if test_missing == name:
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docs = None
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if docs:
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lines = docs.splitlines()
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first_line = lines[0]
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rest = [line[4:] for line in lines[1:]]
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hdr = 'Entry: %s: %s' % (name.replace('_', '-'), first_line)
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print(hdr)
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print('-' * len(hdr))
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print('\n'.join(rest))
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print()
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print()
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else:
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missing.append(name)
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if missing:
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raise ValueError('Documentation is missing for modules: %s' %
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', '.join(missing))
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def GetUniqueName(self):
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"""Get a unique name for a node
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Returns:
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String containing a unique name for a node, consisting of the name
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of all ancestors (starting from within the 'binman' node) separated
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by a dot ('.'). This can be useful for generating unique filesnames
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in the output directory.
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"""
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name = self.name
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node = self._node
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while node.parent:
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node = node.parent
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if node.name == 'binman':
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break
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name = '%s.%s' % (node.name, name)
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return name
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def ExpandToLimit(self, limit):
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"""Expand an entry so that it ends at the given offset limit"""
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if self.offset + self.size < limit:
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self.size = limit - self.offset
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# Request the contents again, since changing the size requires that
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# the data grows. This should not fail, but check it to be sure.
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if not self.ObtainContents():
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self.Raise('Cannot obtain contents when expanding entry')
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