# SPDX-License-Identifier: GPL-2.0+ # Copyright (c) 2016 Google, Inc # # Base class for all entries # from __future__ import print_function from collections import namedtuple # importlib was introduced in Python 2.7 but there was a report of it not # working in 2.7.12, so we work around this: # http://lists.denx.de/pipermail/u-boot/2016-October/269729.html try: import importlib have_importlib = True except: have_importlib = False import os import sys import fdt_util import state import tools modules = {} our_path = os.path.dirname(os.path.realpath(__file__)) # An argument which can be passed to entries on the command line, in lieu of # device-tree properties. EntryArg = namedtuple('EntryArg', ['name', 'datatype']) # Information about an entry for use when displaying summaries EntryInfo = namedtuple('EntryInfo', ['indent', 'name', 'etype', 'size', 'image_pos', 'uncomp_size', 'offset', 'entry']) class Entry(object): """An Entry in the section An entry corresponds to a single node in the device-tree description of the section. Each entry ends up being a part of the final section. Entries can be placed either right next to each other, or with padding between them. The type of the entry determines the data that is in it. This class is not used by itself. All entry objects are subclasses of Entry. Attributes: section: Section object containing this entry node: The node that created this entry offset: Offset of entry within the section, None if not known yet (in which case it will be calculated by Pack()) size: Entry size in bytes, None if not known uncomp_size: Size of uncompressed data in bytes, if the entry is compressed, else None contents_size: Size of contents in bytes, 0 by default align: Entry start offset alignment, or None align_size: Entry size alignment, or None align_end: Entry end offset alignment, or None pad_before: Number of pad bytes before the contents, 0 if none pad_after: Number of pad bytes after the contents, 0 if none data: Contents of entry (string of bytes) compress: Compression algoithm used (e.g. 'lz4'), 'none' if none orig_offset: Original offset value read from node orig_size: Original size value read from node """ def __init__(self, section, etype, node, read_node=True, name_prefix=''): self.section = section self.etype = etype self._node = node self.name = node and (name_prefix + node.name) or 'none' self.offset = None self.size = None self.uncomp_size = None self.data = None self.contents_size = 0 self.align = None self.align_size = None self.align_end = None self.pad_before = 0 self.pad_after = 0 self.offset_unset = False self.image_pos = None self._expand_size = False self.compress = 'none' if read_node: self.ReadNode() @staticmethod def Lookup(node_path, etype): """Look up the entry class for a node. Args: node_node: Path name of Node object containing information about the entry to create (used for errors) etype: Entry type to use Returns: The entry class object if found, else None """ # Convert something like 'u-boot@0' to 'u_boot' since we are only # interested in the type. module_name = etype.replace('-', '_') if '@' in module_name: module_name = module_name.split('@')[0] module = modules.get(module_name) # Also allow entry-type modules to be brought in from the etype directory. # Import the module if we have not already done so. if not module: old_path = sys.path sys.path.insert(0, os.path.join(our_path, 'etype')) try: if have_importlib: module = importlib.import_module(module_name) else: module = __import__(module_name) except ImportError as e: raise ValueError("Unknown entry type '%s' in node '%s' (expected etype/%s.py, error '%s'" % (etype, node_path, module_name, e)) finally: sys.path = old_path modules[module_name] = module # Look up the expected class name return getattr(module, 'Entry_%s' % module_name) @staticmethod def Create(section, node, etype=None): """Create a new entry for a node. Args: section: Section object containing this node node: Node object containing information about the entry to create etype: Entry type to use, or None to work it out (used for tests) Returns: A new Entry object of the correct type (a subclass of Entry) """ if not etype: etype = fdt_util.GetString(node, 'type', node.name) obj = Entry.Lookup(node.path, etype) # Call its constructor to get the object we want. return obj(section, etype, node) def ReadNode(self): """Read entry information from the node This reads all the fields we recognise from the node, ready for use. """ if 'pos' in self._node.props: self.Raise("Please use 'offset' instead of 'pos'") self.offset = fdt_util.GetInt(self._node, 'offset') self.size = fdt_util.GetInt(self._node, 'size') self.orig_offset = self.offset self.orig_size = self.size # These should not be set in input files, but are set in an FDT map, # which is also read by this code. self.image_pos = fdt_util.GetInt(self._node, 'image-pos') self.uncomp_size = fdt_util.GetInt(self._node, 'uncomp-size') self.align = fdt_util.GetInt(self._node, 'align') if tools.NotPowerOfTwo(self.align): raise ValueError("Node '%s': Alignment %s must be a power of two" % (self._node.path, self.align)) self.pad_before = fdt_util.GetInt(self._node, 'pad-before', 0) self.pad_after = fdt_util.GetInt(self._node, 'pad-after', 0) self.align_size = fdt_util.GetInt(self._node, 'align-size') if tools.NotPowerOfTwo(self.align_size): self.Raise("Alignment size %s must be a power of two" % self.align_size) self.align_end = fdt_util.GetInt(self._node, 'align-end') self.offset_unset = fdt_util.GetBool(self._node, 'offset-unset') self.expand_size = fdt_util.GetBool(self._node, 'expand-size') def GetDefaultFilename(self): return None def GetFdtSet(self): """Get the set of device trees used by this entry Returns: Set containing the filename from this entry, if it is a .dtb, else an empty set """ fname = self.GetDefaultFilename() # It would be better to use isinstance(self, Entry_blob_dtb) here but # we cannot access Entry_blob_dtb if fname and fname.endswith('.dtb'): return set([fname]) return set() def ExpandEntries(self): pass def AddMissingProperties(self): """Add new properties to the device tree as needed for this entry""" for prop in ['offset', 'size', 'image-pos']: if not prop in self._node.props: state.AddZeroProp(self._node, prop) if self.compress != 'none': state.AddZeroProp(self._node, 'uncomp-size') err = state.CheckAddHashProp(self._node) if err: self.Raise(err) def SetCalculatedProperties(self): """Set the value of device-tree properties calculated by binman""" state.SetInt(self._node, 'offset', self.offset) state.SetInt(self._node, 'size', self.size) base = self.section.GetRootSkipAtStart() if self.section else 0 state.SetInt(self._node, 'image-pos', self.image_pos - base) if self.uncomp_size is not None: state.SetInt(self._node, 'uncomp-size', self.uncomp_size) state.CheckSetHashValue(self._node, self.GetData) def ProcessFdt(self, fdt): """Allow entries to adjust the device tree Some entries need to adjust the device tree for their purposes. This may involve adding or deleting properties. Returns: True if processing is complete False if processing could not be completed due to a dependency. This will cause the entry to be retried after others have been called """ return True def SetPrefix(self, prefix): """Set the name prefix for a node Args: prefix: Prefix to set, or '' to not use a prefix """ if prefix: self.name = prefix + self.name def SetContents(self, data): """Set the contents of an entry This sets both the data and content_size properties Args: data: Data to set to the contents (bytes) """ self.data = data self.contents_size = len(self.data) def ProcessContentsUpdate(self, data): """Update the contents of an entry, after the size is fixed This checks that the new data is the same size as the old. If the size has changed, this triggers a re-run of the packing algorithm. Args: data: Data to set to the contents (bytes) Raises: ValueError if the new data size is not the same as the old """ size_ok = True new_size = len(data) if state.AllowEntryExpansion(): if new_size > self.contents_size: print("Entry '%s' size change from %#x to %#x" % ( self._node.path, self.contents_size, new_size)) # self.data will indicate the new size needed size_ok = False elif new_size != self.contents_size: self.Raise('Cannot update entry size from %d to %d' % (self.contents_size, new_size)) self.SetContents(data) return size_ok def ObtainContents(self): """Figure out the contents of an entry. Returns: True if the contents were found, False if another call is needed after the other entries are processed. """ # No contents by default: subclasses can implement this return True def ResetForPack(self): """Reset offset/size fields so that packing can be done again""" self.offset = self.orig_offset self.size = self.orig_size def Pack(self, offset): """Figure out how to pack the entry into the section Most of the time the entries are not fully specified. There may be an alignment but no size. In that case we take the size from the contents of the entry. If an entry has no hard-coded offset, it will be placed at @offset. Once this function is complete, both the offset and size of the entry will be know. Args: Current section offset pointer Returns: New section offset pointer (after this entry) """ if self.offset is None: if self.offset_unset: self.Raise('No offset set with offset-unset: should another ' 'entry provide this correct offset?') self.offset = tools.Align(offset, self.align) needed = self.pad_before + self.contents_size + self.pad_after needed = tools.Align(needed, self.align_size) size = self.size if not size: size = needed new_offset = self.offset + size aligned_offset = tools.Align(new_offset, self.align_end) if aligned_offset != new_offset: size = aligned_offset - self.offset new_offset = aligned_offset if not self.size: self.size = size if self.size < needed: self.Raise("Entry contents size is %#x (%d) but entry size is " "%#x (%d)" % (needed, needed, self.size, self.size)) # Check that the alignment is correct. It could be wrong if the # and offset or size values were provided (i.e. not calculated), but # conflict with the provided alignment values if self.size != tools.Align(self.size, self.align_size): self.Raise("Size %#x (%d) does not match align-size %#x (%d)" % (self.size, self.size, self.align_size, self.align_size)) if self.offset != tools.Align(self.offset, self.align): self.Raise("Offset %#x (%d) does not match align %#x (%d)" % (self.offset, self.offset, self.align, self.align)) return new_offset def Raise(self, msg): """Convenience function to raise an error referencing a node""" raise ValueError("Node '%s': %s" % (self._node.path, msg)) def GetEntryArgsOrProps(self, props, required=False): """Return the values of a set of properties Args: props: List of EntryArg objects Raises: ValueError if a property is not found """ values = [] missing = [] for prop in props: python_prop = prop.name.replace('-', '_') if hasattr(self, python_prop): value = getattr(self, python_prop) else: value = None if value is None: value = self.GetArg(prop.name, prop.datatype) if value is None and required: missing.append(prop.name) values.append(value) if missing: self.Raise('Missing required properties/entry args: %s' % (', '.join(missing))) return values def GetPath(self): """Get the path of a node Returns: Full path of the node for this entry """ return self._node.path def GetData(self): return self.data def GetOffsets(self): """Get the offsets for siblings Some entry types can contain information about the position or size of other entries. An example of this is the Intel Flash Descriptor, which knows where the Intel Management Engine section should go. If this entry knows about the position of other entries, it can specify this by returning values here Returns: Dict: key: Entry type value: List containing position and size of the given entry type. Either can be None if not known """ return {} def SetOffsetSize(self, offset, size): """Set the offset and/or size of an entry Args: offset: New offset, or None to leave alone size: New size, or None to leave alone """ if offset is not None: self.offset = offset if size is not None: self.size = size def SetImagePos(self, image_pos): """Set the position in the image Args: image_pos: Position of this entry in the image """ self.image_pos = image_pos + self.offset def ProcessContents(self): """Do any post-packing updates of entry contents This function should call ProcessContentsUpdate() to update the entry contents, if necessary, returning its return value here. Args: data: Data to set to the contents (bytes) Returns: True if the new data size is OK, False if expansion is needed Raises: ValueError if the new data size is not the same as the old and state.AllowEntryExpansion() is False """ return True def WriteSymbols(self, section): """Write symbol values into binary files for access at run time Args: section: Section containing the entry """ pass def CheckOffset(self): """Check that the entry offsets are correct This is used for entries which have extra offset requirements (other than having to be fully inside their section). Sub-classes can implement this function and raise if there is a problem. """ pass @staticmethod def GetStr(value): if value is None: return ' ' return '%08x' % value @staticmethod def WriteMapLine(fd, indent, name, offset, size, image_pos): print('%s %s%s %s %s' % (Entry.GetStr(image_pos), ' ' * indent, Entry.GetStr(offset), Entry.GetStr(size), name), file=fd) def WriteMap(self, fd, indent): """Write a map of the entry to a .map file Args: fd: File to write the map to indent: Curent indent level of map (0=none, 1=one level, etc.) """ self.WriteMapLine(fd, indent, self.name, self.offset, self.size, self.image_pos) def GetEntries(self): """Return a list of entries contained by this entry Returns: List of entries, or None if none. A normal entry has no entries within it so will return None """ return None def GetArg(self, name, datatype=str): """Get the value of an entry argument or device-tree-node property Some node properties can be provided as arguments to binman. First check the entry arguments, and fall back to the device tree if not found Args: name: Argument name datatype: Data type (str or int) Returns: Value of argument as a string or int, or None if no value Raises: ValueError if the argument cannot be converted to in """ value = state.GetEntryArg(name) if value is not None: if datatype == int: try: value = int(value) except ValueError: self.Raise("Cannot convert entry arg '%s' (value '%s') to integer" % (name, value)) elif datatype == str: pass else: raise ValueError("GetArg() internal error: Unknown data type '%s'" % datatype) else: value = fdt_util.GetDatatype(self._node, name, datatype) return value @staticmethod def WriteDocs(modules, test_missing=None): """Write out documentation about the various entry types to stdout Args: modules: List of modules to include test_missing: Used for testing. This is a module to report as missing """ print('''Binman Entry Documentation =========================== This file describes the entry types supported by binman. These entry types can be placed in an image one by one to build up a final firmware image. It is fairly easy to create new entry types. Just add a new file to the 'etype' directory. You can use the existing entries as examples. Note that some entries are subclasses of others, using and extending their features to produce new behaviours. ''') modules = sorted(modules) # Don't show the test entry if '_testing' in modules: modules.remove('_testing') missing = [] for name in modules: if name.startswith('__'): continue module = Entry.Lookup(name, name) docs = getattr(module, '__doc__') if test_missing == name: docs = None if docs: lines = docs.splitlines() first_line = lines[0] rest = [line[4:] for line in lines[1:]] hdr = 'Entry: %s: %s' % (name.replace('_', '-'), first_line) print(hdr) print('-' * len(hdr)) print('\n'.join(rest)) print() print() else: missing.append(name) if missing: raise ValueError('Documentation is missing for modules: %s' % ', '.join(missing)) def GetUniqueName(self): """Get a unique name for a node Returns: String containing a unique name for a node, consisting of the name of all ancestors (starting from within the 'binman' node) separated by a dot ('.'). This can be useful for generating unique filesnames in the output directory. """ name = self.name node = self._node while node.parent: node = node.parent if node.name == 'binman': break name = '%s.%s' % (node.name, name) return name def ExpandToLimit(self, limit): """Expand an entry so that it ends at the given offset limit""" if self.offset + self.size < limit: self.size = limit - self.offset # Request the contents again, since changing the size requires that # the data grows. This should not fail, but check it to be sure. if not self.ObtainContents(): self.Raise('Cannot obtain contents when expanding entry') def HasSibling(self, name): """Check if there is a sibling of a given name Returns: True if there is an entry with this name in the the same section, else False """ return name in self.section.GetEntries() def GetSiblingImagePos(self, name): """Return the image position of the given sibling Returns: Image position of sibling, or None if the sibling has no position, or False if there is no such sibling """ if not self.HasSibling(name): return False return self.section.GetEntries()[name].image_pos @staticmethod def AddEntryInfo(entries, indent, name, etype, size, image_pos, uncomp_size, offset, entry): """Add a new entry to the entries list Args: entries: List (of EntryInfo objects) to add to indent: Current indent level to add to list name: Entry name (string) etype: Entry type (string) size: Entry size in bytes (int) image_pos: Position within image in bytes (int) uncomp_size: Uncompressed size if the entry uses compression, else None offset: Entry offset within parent in bytes (int) entry: Entry object """ entries.append(EntryInfo(indent, name, etype, size, image_pos, uncomp_size, offset, entry)) def ListEntries(self, entries, indent): """Add files in this entry to the list of entries This can be overridden by subclasses which need different behaviour. Args: entries: List (of EntryInfo objects) to add to indent: Current indent level to add to list """ self.AddEntryInfo(entries, indent, self.name, self.etype, self.size, self.image_pos, self.uncomp_size, self.offset, self)