388 lines
14 KiB
Python
388 lines
14 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2016 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# Class for an image, the output of binman
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#
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from collections import OrderedDict
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import fnmatch
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from operator import attrgetter
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import os
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import re
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import sys
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from binman.entry import Entry
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from binman.etype import fdtmap
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from binman.etype import image_header
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from binman.etype import section
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from dtoc import fdt
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from dtoc import fdt_util
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from patman import tools
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from patman import tout
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class Image(section.Entry_section):
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"""A Image, representing an output from binman
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An image is comprised of a collection of entries each containing binary
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data. The image size must be large enough to hold all of this data.
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This class implements the various operations needed for images.
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Attributes:
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filename: Output filename for image
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image_node: Name of node containing the description for this image
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fdtmap_dtb: Fdt object for the fdtmap when loading from a file
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fdtmap_data: Contents of the fdtmap when loading from a file
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allow_repack: True to add properties to allow the image to be safely
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repacked later
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Args:
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copy_to_orig: Copy offset/size to orig_offset/orig_size after reading
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from the device tree
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test: True if this is being called from a test of Images. This this case
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there is no device tree defining the structure of the section, so
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we create a section manually.
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ignore_missing: Ignore any missing entry arguments (i.e. don't raise an
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exception). This should be used if the Image is being loaded from
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a file rather than generated. In that case we obviously don't need
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the entry arguments since the contents already exists.
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use_expanded: True if we are updating the FDT wth entry offsets, etc.
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and should use the expanded versions of the U-Boot entries.
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Any entry type that includes a devicetree must put it in a
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separate entry so that it will be updated. For example. 'u-boot'
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normally just picks up 'u-boot.bin' which includes the
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devicetree, but this is not updateable, since it comes into
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binman as one piece and binman doesn't know that it is actually
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an executable followed by a devicetree. Of course it could be
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taught this, but then when reading an image (e.g. 'binman ls')
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it may need to be able to split the devicetree out of the image
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in order to determine the location of things. Instead we choose
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to ignore 'u-boot-bin' in this case, and build it ourselves in
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binman with 'u-boot-dtb.bin' and 'u-boot.dtb'. See
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Entry_u_boot_expanded and Entry_blob_phase for details.
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"""
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def __init__(self, name, node, copy_to_orig=True, test=False,
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ignore_missing=False, use_expanded=False):
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super().__init__(None, 'section', node, test=test)
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self.copy_to_orig = copy_to_orig
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self.name = 'main-section'
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self.image_name = name
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self._filename = '%s.bin' % self.image_name
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self.fdtmap_dtb = None
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self.fdtmap_data = None
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self.allow_repack = False
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self._ignore_missing = ignore_missing
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self.use_expanded = use_expanded
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if not test:
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self.ReadNode()
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def ReadNode(self):
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super().ReadNode()
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filename = fdt_util.GetString(self._node, 'filename')
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if filename:
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self._filename = filename
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self.allow_repack = fdt_util.GetBool(self._node, 'allow-repack')
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@classmethod
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def FromFile(cls, fname):
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"""Convert an image file into an Image for use in binman
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Args:
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fname: Filename of image file to read
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Returns:
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Image object on success
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Raises:
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ValueError if something goes wrong
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"""
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data = tools.ReadFile(fname)
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size = len(data)
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# First look for an image header
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pos = image_header.LocateHeaderOffset(data)
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if pos is None:
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# Look for the FDT map
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pos = fdtmap.LocateFdtmap(data)
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if pos is None:
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raise ValueError('Cannot find FDT map in image')
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# We don't know the FDT size, so check its header first
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probe_dtb = fdt.Fdt.FromData(
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data[pos + fdtmap.FDTMAP_HDR_LEN:pos + 256])
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dtb_size = probe_dtb.GetFdtObj().totalsize()
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fdtmap_data = data[pos:pos + dtb_size + fdtmap.FDTMAP_HDR_LEN]
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fdt_data = fdtmap_data[fdtmap.FDTMAP_HDR_LEN:]
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out_fname = tools.GetOutputFilename('fdtmap.in.dtb')
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tools.WriteFile(out_fname, fdt_data)
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dtb = fdt.Fdt(out_fname)
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dtb.Scan()
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# Return an Image with the associated nodes
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root = dtb.GetRoot()
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image = Image('image', root, copy_to_orig=False, ignore_missing=True)
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image.image_node = fdt_util.GetString(root, 'image-node', 'image')
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image.fdtmap_dtb = dtb
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image.fdtmap_data = fdtmap_data
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image._data = data
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image._filename = fname
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image.image_name, _ = os.path.splitext(fname)
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return image
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def Raise(self, msg):
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"""Convenience function to raise an error referencing an image"""
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raise ValueError("Image '%s': %s" % (self._node.path, msg))
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def PackEntries(self):
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"""Pack all entries into the image"""
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super().Pack(0)
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def SetImagePos(self):
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# This first section in the image so it starts at 0
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super().SetImagePos(0)
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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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Returns:
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True if the new data size is OK, False if expansion is needed
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"""
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return super().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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super().WriteSymbols(self)
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def BuildImage(self):
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"""Write the image to a file"""
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fname = tools.GetOutputFilename(self._filename)
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tout.Info("Writing image to '%s'" % fname)
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with open(fname, 'wb') as fd:
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data = self.GetPaddedData()
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fd.write(data)
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tout.Info("Wrote %#x bytes" % len(data))
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def WriteMap(self):
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"""Write a map of the image to a .map file
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Returns:
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Filename of map file written
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"""
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filename = '%s.map' % self.image_name
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fname = tools.GetOutputFilename(filename)
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with open(fname, 'w') as fd:
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print('%8s %8s %8s %s' % ('ImagePos', 'Offset', 'Size', 'Name'),
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file=fd)
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super().WriteMap(fd, 0)
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return fname
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def BuildEntryList(self):
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"""List the files in an image
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Returns:
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List of entry.EntryInfo objects describing all entries in the image
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"""
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entries = []
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self.ListEntries(entries, 0)
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return entries
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def FindEntryPath(self, entry_path):
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"""Find an entry at a given path in the image
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Args:
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entry_path: Path to entry (e.g. /ro-section/u-boot')
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Returns:
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Entry object corresponding to that past
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Raises:
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ValueError if no entry found
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"""
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parts = entry_path.split('/')
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entries = self.GetEntries()
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parent = '/'
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for part in parts:
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entry = entries.get(part)
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if not entry:
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raise ValueError("Entry '%s' not found in '%s'" %
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(part, parent))
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parent = entry.GetPath()
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entries = entry.GetEntries()
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return entry
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def ReadData(self, decomp=True):
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tout.Debug("Image '%s' ReadData(), size=%#x" %
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(self.GetPath(), len(self._data)))
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return self._data
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def GetListEntries(self, entry_paths):
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"""List the entries in an image
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This decodes the supplied image and returns a list of entries from that
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image, preceded by a header.
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Args:
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entry_paths: List of paths to match (each can have wildcards). Only
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entries whose names match one of these paths will be printed
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Returns:
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String error message if something went wrong, otherwise
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3-Tuple:
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List of EntryInfo objects
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List of lines, each
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List of text columns, each a string
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List of widths of each column
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"""
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def _EntryToStrings(entry):
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"""Convert an entry to a list of strings, one for each column
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Args:
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entry: EntryInfo object containing information to output
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Returns:
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List of strings, one for each field in entry
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"""
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def _AppendHex(val):
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"""Append a hex value, or an empty string if val is None
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Args:
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val: Integer value, or None if none
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"""
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args.append('' if val is None else '>%x' % val)
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args = [' ' * entry.indent + entry.name]
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_AppendHex(entry.image_pos)
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_AppendHex(entry.size)
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args.append(entry.etype)
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_AppendHex(entry.offset)
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_AppendHex(entry.uncomp_size)
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return args
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def _DoLine(lines, line):
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"""Add a line to the output list
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This adds a line (a list of columns) to the output list. It also updates
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the widths[] array with the maximum width of each column
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Args:
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lines: List of lines to add to
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line: List of strings, one for each column
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"""
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for i, item in enumerate(line):
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widths[i] = max(widths[i], len(item))
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lines.append(line)
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def _NameInPaths(fname, entry_paths):
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"""Check if a filename is in a list of wildcarded paths
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Args:
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fname: Filename to check
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entry_paths: List of wildcarded paths (e.g. ['*dtb*', 'u-boot*',
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'section/u-boot'])
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Returns:
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True if any wildcard matches the filename (using Unix filename
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pattern matching, not regular expressions)
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False if not
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"""
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for path in entry_paths:
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if fnmatch.fnmatch(fname, path):
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return True
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return False
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entries = self.BuildEntryList()
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# This is our list of lines. Each item in the list is a list of strings, one
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# for each column
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lines = []
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HEADER = ['Name', 'Image-pos', 'Size', 'Entry-type', 'Offset',
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'Uncomp-size']
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num_columns = len(HEADER)
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# This records the width of each column, calculated as the maximum width of
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# all the strings in that column
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widths = [0] * num_columns
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_DoLine(lines, HEADER)
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# We won't print anything unless it has at least this indent. So at the
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# start we will print nothing, unless a path matches (or there are no
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# entry paths)
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MAX_INDENT = 100
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min_indent = MAX_INDENT
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path_stack = []
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path = ''
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indent = 0
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selected_entries = []
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for entry in entries:
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if entry.indent > indent:
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path_stack.append(path)
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elif entry.indent < indent:
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path_stack.pop()
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if path_stack:
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path = path_stack[-1] + '/' + entry.name
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indent = entry.indent
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# If there are entry paths to match and we are not looking at a
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# sub-entry of a previously matched entry, we need to check the path
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if entry_paths and indent <= min_indent:
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if _NameInPaths(path[1:], entry_paths):
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# Print this entry and all sub-entries (=higher indent)
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min_indent = indent
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else:
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# Don't print this entry, nor any following entries until we get
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# a path match
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min_indent = MAX_INDENT
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continue
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_DoLine(lines, _EntryToStrings(entry))
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selected_entries.append(entry)
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return selected_entries, lines, widths
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def LookupImageSymbol(self, sym_name, optional, msg, base_addr):
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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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This searches through this image including all of its subsections.
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At present the only entry properties supported are:
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offset
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image_pos - 'base_addr' is added if this is not an end-at-4gb image
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size
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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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base_addr: Base address of image. This is added to the returned
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image_pos in most cases so that the returned position indicates
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where the targeted entry/binary has actually been loaded. But
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if end-at-4gb is used, this is not done, since the binary is
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already assumed to be linked to the ROM position and using
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execute-in-place (XIP).
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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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entries = OrderedDict()
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entries_by_name = {}
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self._CollectEntries(entries, entries_by_name, self)
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return self.LookupSymbol(sym_name, optional, msg, base_addr,
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entries_by_name)
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