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78 lines
2.1 KiB
Python
78 lines
2.1 KiB
Python
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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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# SPDX-License-Identifier: GPL-2.0+
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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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Symbol = namedtuple('Symbol', ['section', 'address', 'size', 'weak'])
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# Used for tests which don't have an ELF file to read
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ignore_missing_files = False
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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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