mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
128 lines
4.2 KiB
Python
128 lines
4.2 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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# Handle various things related to ELF images
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#
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from collections import namedtuple, OrderedDict
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import command
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import os
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import re
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import struct
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import tools
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# This is enabled from control.py
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debug = False
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Symbol = namedtuple('Symbol', ['section', 'address', 'size', 'weak'])
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def GetSymbols(fname, patterns):
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"""Get the symbols from an ELF file
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Args:
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fname: Filename of the ELF file to read
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patterns: List of regex patterns to search for, each a string
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Returns:
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None, if the file does not exist, or Dict:
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key: Name of symbol
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value: Hex value of symbol
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"""
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stdout = command.Output('objdump', '-t', fname, raise_on_error=False)
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lines = stdout.splitlines()
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if patterns:
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re_syms = re.compile('|'.join(patterns))
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else:
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re_syms = None
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syms = {}
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syms_started = False
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for line in lines:
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if not line or not syms_started:
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if 'SYMBOL TABLE' in line:
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syms_started = True
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line = None # Otherwise code coverage complains about 'continue'
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continue
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if re_syms and not re_syms.search(line):
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continue
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space_pos = line.find(' ')
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value, rest = line[:space_pos], line[space_pos + 1:]
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flags = rest[:7]
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parts = rest[7:].split()
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section, size = parts[:2]
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if len(parts) > 2:
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name = parts[2]
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syms[name] = Symbol(section, int(value, 16), int(size,16),
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flags[1] == 'w')
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return syms
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def GetSymbolAddress(fname, sym_name):
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"""Get a value of a symbol from an ELF file
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Args:
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fname: Filename of the ELF file to read
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patterns: List of regex patterns to search for, each a string
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Returns:
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Symbol value (as an integer) or None if not found
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"""
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syms = GetSymbols(fname, [sym_name])
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sym = syms.get(sym_name)
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if not sym:
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return None
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return sym.address
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def LookupAndWriteSymbols(elf_fname, entry, image):
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"""Replace all symbols in an entry with their correct values
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The entry contents is updated so that values for referenced symbols will be
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visible at run time. This is done by finding out the symbols positions in
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the entry (using the ELF file) and replacing them with values from binman's
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data structures.
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Args:
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elf_fname: Filename of ELF image containing the symbol information for
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entry
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entry: Entry to process
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image: Image which can be used to lookup symbol values
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"""
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fname = tools.GetInputFilename(elf_fname)
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syms = GetSymbols(fname, ['image', 'binman'])
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if not syms:
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return
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base = syms.get('__image_copy_start')
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if not base:
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return
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for name, sym in syms.iteritems():
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if name.startswith('_binman'):
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msg = ("Image '%s': Symbol '%s'\n in entry '%s'" %
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(image.GetPath(), name, entry.GetPath()))
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offset = sym.address - base.address
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if offset < 0 or offset + sym.size > entry.contents_size:
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raise ValueError('%s has offset %x (size %x) but the contents '
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'size is %x' % (entry.GetPath(), offset,
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sym.size, entry.contents_size))
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if sym.size == 4:
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pack_string = '<I'
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elif sym.size == 8:
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pack_string = '<Q'
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else:
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raise ValueError('%s has size %d: only 4 and 8 are supported' %
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(msg, sym.size))
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# Look up the symbol in our entry tables.
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value = image.LookupSymbol(name, sym.weak, msg)
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if value is not None:
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value += base.address
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else:
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value = -1
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pack_string = pack_string.lower()
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value_bytes = struct.pack(pack_string, value)
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if debug:
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print('%s:\n insert %s, offset %x, value %x, length %d' %
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(msg, name, offset, value, len(value_bytes)))
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entry.data = (entry.data[:offset] + value_bytes +
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entry.data[offset + sym.size:])
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