mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 17:08:52 +09:00
![Simon Glass](/assets/img/avatar_default.png)
When we get a problem like overlapping regions it is sometimes hard to figure what what is going on. At present we don't write the map file in this case. However the file does provide useful information. Catch any packing errors and write a map file (if enabled with -m) to aid debugging. Signed-off-by: Simon Glass <sjg@chromium.org>
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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