blob: 3eb9f21988e07388640586fe65a6cf4939049d83 [file] [log] [blame]
#!/usr/bin/env python3
#
# Copyright (c) 2017 Intel Corporation.
#
# SPDX-License-Identifier: Apache-2.0
#
"""
This script scans a specified object file and generates a header file
that defined macros for the offsets of various found structure members
(particularly symbols ending with ``_OFFSET`` or ``_SIZEOF``), primarily
intended for use in assembly code.
"""
from elftools.elf.elffile import ELFFile
from elftools.elf.sections import SymbolTableSection
import argparse
import sys
def get_symbol_table(obj):
for section in obj.iter_sections():
if isinstance(section, SymbolTableSection):
return section
raise LookupError("Could not find symbol table")
def gen_offset_header(input_name, input_file, output_file):
include_guard = "__GEN_OFFSETS_H__"
output_file.write("""/* THIS FILE IS AUTO GENERATED. PLEASE DO NOT EDIT.
*
* This header file provides macros for the offsets of various structure
* members. These offset macros are primarily intended to be used in
* assembly code.
*/
#ifndef %s
#define %s\n\n""" % (include_guard, include_guard))
obj = ELFFile(input_file)
for sym in get_symbol_table(obj).iter_symbols():
if isinstance(sym.name, bytes):
sym.name = str(sym.name, 'ascii')
if not sym.name.endswith(('_OFFSET', '_SIZEOF')):
continue
if sym.entry['st_shndx'] != 'SHN_ABS':
continue
if sym.entry['st_info']['bind'] != 'STB_GLOBAL':
continue
output_file.write(
"#define %s 0x%x\n" %
(sym.name, sym.entry['st_value']))
output_file.write("\n#endif /* %s */\n" % include_guard)
return 0
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter, allow_abbrev=False)
parser.add_argument(
"-i",
"--input",
required=True,
help="Input object file")
parser.add_argument(
"-o",
"--output",
required=True,
help="Output header file")
args = parser.parse_args()
input_file = open(args.input, 'rb')
output_file = open(args.output, 'w')
ret = gen_offset_header(args.input, input_file, output_file)
sys.exit(ret)