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465 lines
17 KiB
Python
465 lines
17 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2018 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# Base class for sections (collections of entries)
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#
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from __future__ import print_function
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from collections import OrderedDict
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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 re
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import state
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import tools
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class Section(object):
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"""A section which contains multiple entries
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A section represents a collection of entries. There must be one or more
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sections in an image. Sections are used to group entries together.
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Attributes:
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_node: Node object that contains the section definition in device tree
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_parent_section: Parent Section object which created this Section
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_size: Section size in bytes, or None if not known yet
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_align_size: Section size alignment, or None
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_pad_before: Number of bytes before the first entry starts. This
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effectively changes the place where entry offset 0 starts
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_pad_after: Number of bytes after the last entry ends. The last
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entry will finish on or before this boundary
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_pad_byte: Byte to use to pad the section where there is no entry
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_sort: True if entries should be sorted by offset, False if they
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must be in-order in the device tree description
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_skip_at_start: Number of bytes before the first entry starts. These
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effectively adjust the starting offset of entries. For example,
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if _pad_before is 16, then the first entry would start at 16.
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An entry with offset = 20 would in fact be written at offset 4
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in the image file.
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_end_4gb: Indicates that the section ends at the 4GB boundary. This is
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used for x86 images, which want to use offsets such that a memory
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address (like 0xff800000) is the first entry offset. This causes
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_skip_at_start to be set to the starting memory address.
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_name_prefix: Prefix to add to the name of all entries within this
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section
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_entries: OrderedDict() of entries
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"""
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def __init__(self, name, parent_section, node, image, test=False):
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global entry
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global Entry
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import entry
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from entry import Entry
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self._parent_section = parent_section
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self._name = name
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self._node = node
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self._image = image
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self._offset = 0
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self._size = None
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self._align_size = None
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self._pad_before = 0
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self._pad_after = 0
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self._pad_byte = 0
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self._sort = False
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self._skip_at_start = None
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self._end_4gb = False
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self._name_prefix = ''
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self._entries = OrderedDict()
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self._image_pos = None
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if not test:
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self._ReadNode()
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self._ReadEntries()
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def _ReadNode(self):
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"""Read properties from the section node"""
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self._size = fdt_util.GetInt(self._node, 'size')
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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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self._Raise("Alignment size %s must be a power of two" %
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self._align_size)
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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._pad_byte = fdt_util.GetInt(self._node, 'pad-byte', 0)
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self._sort = fdt_util.GetBool(self._node, 'sort-by-offset')
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self._end_4gb = fdt_util.GetBool(self._node, 'end-at-4gb')
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self._skip_at_start = fdt_util.GetInt(self._node, 'skip-at-start')
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if self._end_4gb:
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if not self._size:
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self._Raise("Section size must be provided when using end-at-4gb")
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if self._skip_at_start is not None:
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self._Raise("Provide either 'end-at-4gb' or 'skip-at-start'")
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else:
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self._skip_at_start = 0x100000000 - self._size
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else:
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if self._skip_at_start is None:
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self._skip_at_start = 0
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self._name_prefix = fdt_util.GetString(self._node, 'name-prefix')
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def _ReadEntries(self):
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for node in self._node.subnodes:
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if node.name == 'hash':
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continue
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entry = Entry.Create(self, node)
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entry.SetPrefix(self._name_prefix)
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self._entries[node.name] = entry
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def GetFdtSet(self):
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"""Get the set of device tree files used by this image"""
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fdt_set = Set()
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for entry in self._entries.values():
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fdt_set.update(entry.GetFdtSet())
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return fdt_set
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def SetOffset(self, offset):
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self._offset = offset
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def ExpandEntries(self):
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for entry in self._entries.values():
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entry.ExpandEntries()
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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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state.CheckAddHashProp(self._node)
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for entry in self._entries.values():
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entry.AddMissingProperties()
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def SetCalculatedProperties(self):
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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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image_pos = self._image_pos
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if self._parent_section:
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image_pos -= self._parent_section.GetRootSkipAtStart()
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state.SetInt(self._node, 'image-pos', image_pos)
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for entry in self._entries.values():
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entry.SetCalculatedProperties()
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def ProcessFdt(self, fdt):
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todo = self._entries.values()
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for passnum in range(3):
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next_todo = []
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for entry in todo:
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if not entry.ProcessFdt(fdt):
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next_todo.append(entry)
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todo = next_todo
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if not todo:
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break
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if todo:
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self._Raise('Internal error: Could not complete processing of Fdt: '
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'remaining %s' % todo)
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return True
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def CheckSize(self):
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"""Check that the section contents does not exceed its size, etc."""
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contents_size = 0
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for entry in self._entries.values():
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contents_size = max(contents_size, entry.offset + entry.size)
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contents_size -= self._skip_at_start
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size = self._size
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if not size:
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size = self._pad_before + contents_size + self._pad_after
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size = tools.Align(size, self._align_size)
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if self._size and contents_size > self._size:
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self._Raise("contents size %#x (%d) exceeds section size %#x (%d)" %
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(contents_size, contents_size, self._size, self._size))
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if not self._size:
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self._size = size
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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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return size
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def _Raise(self, msg):
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"""Raises an error for this section
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Args:
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msg: Error message to use in the raise string
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Raises:
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ValueError()
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"""
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raise ValueError("Section '%s': %s" % (self._node.path, msg))
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def GetPath(self):
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"""Get the path of an image (in the FDT)
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Returns:
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Full path of the node for this image
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"""
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return self._node.path
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def FindEntryType(self, etype):
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"""Find an entry type in the section
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Args:
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etype: Entry type to find
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Returns:
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entry matching that type, or None if not found
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"""
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for entry in self._entries.values():
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if entry.etype == etype:
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return entry
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return None
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def GetEntryContents(self):
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"""Call ObtainContents() for each entry
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This calls each entry's ObtainContents() a few times until they all
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return True. We stop calling an entry's function once it returns
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True. This allows the contents of one entry to depend on another.
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After 3 rounds we give up since it's likely an error.
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"""
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todo = self._entries.values()
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for passnum in range(3):
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next_todo = []
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for entry in todo:
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if not entry.ObtainContents():
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next_todo.append(entry)
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todo = next_todo
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if not todo:
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break
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if todo:
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self._Raise('Internal error: Could not complete processing of '
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'contents: remaining %s' % todo)
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return True
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def _SetEntryOffsetSize(self, name, offset, size):
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"""Set the offset and size of an entry
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Args:
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name: Entry name to update
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offset: New offset
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size: New size
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"""
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entry = self._entries.get(name)
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if not entry:
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self._Raise("Unable to set offset/size for unknown entry '%s'" %
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name)
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entry.SetOffsetSize(self._skip_at_start + offset, size)
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def GetEntryOffsets(self):
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"""Handle entries that want to set the offset/size of other entries
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This calls each entry's GetOffsets() method. If it returns a list
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of entries to update, it updates them.
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"""
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for entry in self._entries.values():
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offset_dict = entry.GetOffsets()
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for name, info in offset_dict.iteritems():
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self._SetEntryOffsetSize(name, *info)
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def PackEntries(self):
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"""Pack all entries into the section"""
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offset = self._skip_at_start
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for entry in self._entries.values():
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offset = entry.Pack(offset)
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self._size = self.CheckSize()
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def _SortEntries(self):
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"""Sort entries by offset"""
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entries = sorted(self._entries.values(), key=lambda entry: entry.offset)
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self._entries.clear()
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for entry in entries:
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self._entries[entry._node.name] = entry
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def _ExpandEntries(self):
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"""Expand any entries that are permitted to"""
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exp_entry = None
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for entry in self._entries.values():
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if exp_entry:
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exp_entry.ExpandToLimit(entry.offset)
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exp_entry = None
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if entry.expand_size:
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exp_entry = entry
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if exp_entry:
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exp_entry.ExpandToLimit(self._size)
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def CheckEntries(self):
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"""Check that entries do not overlap or extend outside the section
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This also sorts entries, if needed and expands
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"""
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if self._sort:
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self._SortEntries()
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self._ExpandEntries()
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offset = 0
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prev_name = 'None'
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for entry in self._entries.values():
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entry.CheckOffset()
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if (entry.offset < self._skip_at_start or
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entry.offset + entry.size > self._skip_at_start + self._size):
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entry.Raise("Offset %#x (%d) is outside the section starting "
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"at %#x (%d)" %
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(entry.offset, entry.offset, self._skip_at_start,
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self._skip_at_start))
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if entry.offset < offset:
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entry.Raise("Offset %#x (%d) overlaps with previous entry '%s' "
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"ending at %#x (%d)" %
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(entry.offset, entry.offset, prev_name, offset, offset))
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offset = entry.offset + entry.size
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prev_name = entry.GetPath()
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def SetImagePos(self, image_pos):
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self._image_pos = image_pos
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for entry in self._entries.values():
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entry.SetImagePos(image_pos)
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def ProcessEntryContents(self):
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"""Call the ProcessContents() method for each entry
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This is intended to adjust the contents as needed by the entry type.
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"""
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for entry in self._entries.values():
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entry.ProcessContents()
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def WriteSymbols(self):
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"""Write symbol values into binary files for access at run time"""
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for entry in self._entries.values():
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entry.WriteSymbols(self)
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def BuildSection(self, fd, base_offset):
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"""Write the section to a file"""
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fd.seek(base_offset)
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fd.write(self.GetData())
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def GetData(self):
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"""Get the contents of the section"""
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section_data = chr(self._pad_byte) * self._size
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for entry in self._entries.values():
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data = entry.GetData()
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base = self._pad_before + entry.offset - self._skip_at_start
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section_data = (section_data[:base] + data +
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section_data[base + len(data):])
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return section_data
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def LookupSymbol(self, sym_name, optional, msg):
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"""Look up a symbol in an ELF file
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Looks up a symbol in an ELF file. Only entry types which come from an
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ELF image can be used by this function.
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At present the only entry property supported is offset.
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Args:
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sym_name: Symbol name in the ELF file to look up in the format
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_binman_<entry>_prop_<property> where <entry> is the name of
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the entry and <property> is the property to find (e.g.
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_binman_u_boot_prop_offset). As a special case, you can append
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_any to <entry> to have it search for any matching entry. E.g.
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_binman_u_boot_any_prop_offset will match entries called u-boot,
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u-boot-img and u-boot-nodtb)
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optional: True if the symbol is optional. If False this function
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will raise if the symbol is not found
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msg: Message to display if an error occurs
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Returns:
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Value that should be assigned to that symbol, or None if it was
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optional and not found
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Raises:
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ValueError if the symbol is invalid or not found, or references a
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property which is not supported
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"""
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m = re.match(r'^_binman_(\w+)_prop_(\w+)$', sym_name)
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if not m:
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raise ValueError("%s: Symbol '%s' has invalid format" %
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(msg, sym_name))
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entry_name, prop_name = m.groups()
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entry_name = entry_name.replace('_', '-')
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entry = self._entries.get(entry_name)
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if not entry:
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if entry_name.endswith('-any'):
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root = entry_name[:-4]
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for name in self._entries:
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if name.startswith(root):
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rest = name[len(root):]
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if rest in ['', '-img', '-nodtb']:
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entry = self._entries[name]
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if not entry:
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err = ("%s: Entry '%s' not found in list (%s)" %
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(msg, entry_name, ','.join(self._entries.keys())))
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if optional:
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print('Warning: %s' % err, file=sys.stderr)
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return None
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raise ValueError(err)
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if prop_name == 'offset':
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return entry.offset
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elif prop_name == 'image_pos':
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return entry.image_pos
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else:
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raise ValueError("%s: No such property '%s'" % (msg, prop_name))
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def GetEntries(self):
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"""Get the number of entries in a section
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Returns:
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Number of entries in a section
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"""
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return self._entries
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def GetSize(self):
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"""Get the size of a section in bytes
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This is only meaningful if the section has a pre-defined size, or the
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entries within it have been packed, so that the size has been
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calculated.
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Returns:
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Entry size in bytes
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"""
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return self._size
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def WriteMap(self, fd, indent):
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"""Write a map of the section to a .map file
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Args:
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fd: File to write the map to
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"""
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Entry.WriteMapLine(fd, indent, self._name, self._offset, self._size,
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self._image_pos)
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for entry in self._entries.values():
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entry.WriteMap(fd, indent + 1)
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def GetContentsByPhandle(self, phandle, source_entry):
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"""Get the data contents of an entry specified by a phandle
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This uses a phandle to look up a node and and find the entry
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associated with it. Then it returnst he contents of that entry.
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Args:
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phandle: Phandle to look up (integer)
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source_entry: Entry containing that phandle (used for error
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reporting)
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Returns:
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data from associated entry (as a string), or None if not found
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"""
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node = self._node.GetFdt().LookupPhandle(phandle)
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if not node:
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source_entry.Raise("Cannot find node for phandle %d" % phandle)
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for entry in self._entries.values():
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if entry._node == node:
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return entry.GetData()
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source_entry.Raise("Cannot find entry for node '%s'" % node.name)
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def ExpandSize(self, size):
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if size != self._size:
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self._size = size
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def GetRootSkipAtStart(self):
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if self._parent_section:
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return self._parent_section.GetRootSkipAtStart()
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return self._skip_at_start
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def GetImageSize(self):
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return self._image._size
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