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- #!/usr/bin/env python3
- # SPDX-License-Identifier: GPL-2.0+
- """Decode the evspy_info linker list in a U-Boot ELF image"""
- from argparse import ArgumentParser
- import os
- import re
- import struct
- import sys
- our_path = os.path.dirname(os.path.realpath(__file__))
- src_path = os.path.dirname(our_path)
- sys.path.insert(1, os.path.join(our_path, '../tools'))
- from binman import elf
- from u_boot_pylib import tools
- # A typical symbol looks like this:
- # _u_boot_list_2_evspy_info_2_EVT_MISC_INIT_F_3_sandbox_misc_init_f
- PREFIX = '_u_boot_list_2_evspy_info_2_'
- RE_EVTYPE = re.compile('%s(.*)_3_.*' % PREFIX)
- def show_sym(fname, data, endian, evtype, sym):
- """Show information about an evspy entry
- Args:
- fname (str): Filename of ELF file
- data (bytes): Data for this symbol
- endian (str): Endianness to use ('little', 'big', 'auto')
- evtype (str): Event type, e.g. 'MISC_INIT_F'
- sym (elf.Symbol): Symbol to show
- """
- def _unpack_val(sym_data, offset):
- start = offset * func_size
- val_data = sym_data[start:start + func_size]
- fmt = '%s%s' % ('>' if endian == 'big' else '<',
- 'L' if func_size == 4 else 'Q')
- val = struct.unpack(fmt, val_data)[0]
- return val
- # Get the data, which is a struct evspy_info
- sym_data = data[sym.offset:sym.offset + sym.size]
- # Figure out the word size of the struct
- func_size = 4 if sym.size < 16 else 8
- # Read the function name for evspy_info->func
- while True:
- # Switch to big-endian if we see a failure
- func_addr = _unpack_val(sym_data, 0)
- func_name = elf.GetSymbolFromAddress(fname, func_addr)
- if not func_name and endian == 'auto':
- endian = 'big'
- else:
- break
- has_id = sym.size in [12, 24]
- if has_id:
- # Find the address of evspy_info->id in the ELF
- id_addr = _unpack_val(sym_data, 2)
- # Get the file offset for that address
- id_ofs = elf.GetFileOffset(fname, id_addr)
- # Read out a nul-terminated string
- id_data = data[id_ofs:id_ofs + 80]
- pos = id_data.find(0)
- if pos:
- id_data = id_data[:pos]
- id_str = id_data.decode('utf-8')
- else:
- id_str = None
- # Find the file/line for the function
- cmd = ['addr2line', '-e', fname, '%x' % func_addr]
- out = tools.run(*cmd).strip()
- # Drop the full path if it is the current directory
- if out.startswith(src_path):
- out = out[len(src_path) + 1:]
- print('%-20s %-30s %s' % (evtype, id_str or f'f:{func_name}', out))
- def show_event_spy_list(fname, endian):
- """Show a the event-spy- list from a U-Boot image
- Args:
- fname (str): Filename of ELF file
- endian (str): Endianness to use ('little', 'big', 'auto')
- """
- syms = elf.GetSymbolFileOffset(fname, [PREFIX])
- data = tools.read_file(fname)
- print('%-20s %-30s %s' % ('Event type', 'Id', 'Source location'))
- print('%-20s %-30s %s' % ('-' * 20, '-' * 30, '-' * 30))
- for name, sym in syms.items():
- m_evtype = RE_EVTYPE.search(name)
- evtype = m_evtype .group(1)
- show_sym(fname, data, endian, evtype, sym)
- def main(argv):
- """Main program
- Args:
- argv (list of str): List of program arguments, excluding arvg[0]
- """
- epilog = 'Show a list of even spies in a U-Boot EFL file'
- parser = ArgumentParser(epilog=epilog)
- parser.add_argument('elf', type=str, help='ELF file to decode')
- parser.add_argument('-e', '--endian', type=str, default='auto',
- help='Big-endian image')
- args = parser.parse_args(argv)
- show_event_spy_list(args.elf, args.endian)
- if __name__ == "__main__":
- main(sys.argv[1:])
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