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# Copyright (c) 2016 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# SPDX-License-Identifier: GPL-2.0+
#
# Handle various things related to ELF images
#
from collections import namedtuple, OrderedDict
import command
import os
import re
import struct
import tools
Symbol = namedtuple('Symbol', ['section', 'address', 'size', 'weak'])
# Used for tests which don't have an ELF file to read
ignore_missing_files = False
def GetSymbols(fname, patterns):
"""Get the symbols from an ELF file
Args:
fname: Filename of the ELF file to read
patterns: List of regex patterns to search for, each a string
Returns:
None, if the file does not exist, or Dict:
key: Name of symbol
value: Hex value of symbol
"""
stdout = command.Output('objdump', '-t', fname, raise_on_error=False)
lines = stdout.splitlines()
if patterns:
re_syms = re.compile('|'.join(patterns))
else:
re_syms = None
syms = {}
syms_started = False
for line in lines:
if not line or not syms_started:
if 'SYMBOL TABLE' in line:
syms_started = True
line = None # Otherwise code coverage complains about 'continue'
continue
if re_syms and not re_syms.search(line):
continue
space_pos = line.find(' ')
value, rest = line[:space_pos], line[space_pos + 1:]
flags = rest[:7]
parts = rest[7:].split()
section, size = parts[:2]
if len(parts) > 2:
name = parts[2]
syms[name] = Symbol(section, int(value, 16), int(size,16),
flags[1] == 'w')
return syms
def GetSymbolAddress(fname, sym_name):
"""Get a value of a symbol from an ELF file
Args:
fname: Filename of the ELF file to read
patterns: List of regex patterns to search for, each a string
Returns:
Symbol value (as an integer) or None if not found
"""
syms = GetSymbols(fname, [sym_name])
sym = syms.get(sym_name)
if not sym:
return None
return sym.address
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