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