303 lines
11 KiB
Python
303 lines
11 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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import sys
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import fdt_util
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import re
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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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_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 position 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 position, 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 position 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 pos = 20 would in fact be written at position 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 positions such that a
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memory address (like 0xff800000) is the first entry position.
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This causes _skip_at_start to be set to the starting memory
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address.
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_entries: OrderedDict() of entries
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"""
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def __init__(self, name, node, 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._node = node
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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 = 0
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self._end_4gb = False
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self._entries = OrderedDict()
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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-pos')
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self._end_4gb = fdt_util.GetBool(self._node, 'end-at-4gb')
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if self._end_4gb and 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._end_4gb:
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self._skip_at_start = 0x100000000 - self._size
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def _ReadEntries(self):
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for node in self._node.subnodes:
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self._entries[node.name] = Entry.Create(self, node)
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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.pos + 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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def _SetEntryPosSize(self, name, pos, size):
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"""Set the position and size of an entry
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Args:
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name: Entry name to update
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pos: New position
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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 pos/size for unknown entry '%s'" % name)
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entry.SetPositionSize(self._skip_at_start + pos, size)
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def GetEntryPositions(self):
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"""Handle entries that want to set the position/size of other entries
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This calls each entry's GetPositions() 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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pos_dict = entry.GetPositions()
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for name, info in pos_dict.iteritems():
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self._SetEntryPosSize(name, *info)
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def PackEntries(self):
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"""Pack all entries into the section"""
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pos = self._skip_at_start
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for entry in self._entries.values():
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pos = entry.Pack(pos)
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def _SortEntries(self):
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"""Sort entries by position"""
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entries = sorted(self._entries.values(), key=lambda entry: entry.pos)
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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 CheckEntries(self):
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"""Check that entries do not overlap or extend outside the section"""
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if self._sort:
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self._SortEntries()
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pos = 0
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prev_name = 'None'
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for entry in self._entries.values():
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if (entry.pos < self._skip_at_start or
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entry.pos >= self._skip_at_start + self._size):
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entry.Raise("Position %#x (%d) is outside the section starting "
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"at %#x (%d)" %
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(entry.pos, entry.pos, self._skip_at_start,
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self._skip_at_start))
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if entry.pos < pos:
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entry.Raise("Position %#x (%d) overlaps with previous entry '%s' "
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"ending at %#x (%d)" %
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(entry.pos, entry.pos, prev_name, pos, pos))
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pos = entry.pos + entry.size
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prev_name = entry.GetPath()
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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_pos):
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"""Write the section to a file"""
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fd.seek(base_pos)
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fd.write(self.GetData())
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def GetData(self):
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"""Write the section to a file"""
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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.pos - 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 pos.
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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_pos). 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_pos 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 == 'pos':
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return entry.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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return self._entries
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