mirror of
https://github.com/Fishwaldo/u-boot.git
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3ab9598df7
After some thought, I believe there is an unfortunate naming flaw in binman. Entries have a position and size, but now that we support hierarchical sections it is unclear whether a position should be an absolute position within the image, or a relative position within its parent section. At present 'position' actually means the relative position. This indicates a need for an 'image position' for code that wants to find the location of an entry without having to do calculations back through parents to discover this image position. A better name for the current 'position' or 'pos' is 'offset'. It is not always an absolute position, but it is always an offset from its parent offset. It is unfortunate to rename this concept now, 18 months after binman was introduced. However I believe it is the right thing to do. The impact is mostly limited to binman itself and a few changes to in-tree users to binman: tegra sunxi x86 The change makes old binman definitions (e.g. downstream or out-of-tree) incompatible if they use the 'pos = <...>' property. Later work will adjust binman to generate an error when it is used. Signed-off-by: Simon Glass <sjg@chromium.org>
347 lines
13 KiB
Python
347 lines
13 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 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, 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._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 = 0
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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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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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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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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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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 AddMissingProperties(self):
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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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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 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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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 >= 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 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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"""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.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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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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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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for entry in self._entries.values():
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entry.WriteMap(fd, indent)
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