85 lines
2.2 KiB
Python
Executable File
85 lines
2.2 KiB
Python
Executable File
#!/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)
|
|
|
|
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)
|