80 lines
2.1 KiB
Python
80 lines
2.1 KiB
Python
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#!/usr/bin/env python3
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#
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# Copyright (c) 2017 Linaro Limited
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#
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# SPDX-License-Identifier: Apache-2.0
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import sys
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import argparse
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import pprint
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import os
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import struct
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from distutils.version import LooseVersion
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import elftools
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from elftools.elf.elffile import ELFFile
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from elftools.dwarf import descriptions
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from elftools.elf.sections import SymbolTableSection
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if LooseVersion(elftools.__version__) < LooseVersion('0.24'):
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sys.stderr.write("pyelftools is out of date, need version 0.24 or later\n")
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sys.exit(1)
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def get_symbols(obj):
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for section in obj.iter_sections():
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if isinstance(section, SymbolTableSection):
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return {sym.name: sym.entry.st_value
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for sym in section.iter_symbols()}
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raise LookupError("Could not find symbol table")
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def parse_args():
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global args
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parser = argparse.ArgumentParser(
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description=__doc__,
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formatter_class=argparse.RawDescriptionHelpFormatter)
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parser.add_argument(
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"-k", "--kernel", required=True,
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help="Input zephyr ELF binary")
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parser.add_argument(
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"-o", "--output", required=True,
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help="Output linker file")
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parser.add_argument(
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"-v", "--verbose", action="store_true",
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help="Print extra debugging information")
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args = parser.parse_args()
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def main():
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parse_args()
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bit_len = None
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with open(args.kernel, "rb") as fp:
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elf = ELFFile(fp)
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args.little_endian = elf.little_endian
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syms = get_symbols(elf)
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app_ram_size = syms['__app_last_address_used'] - \
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syms['__app_ram_start']
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bit_len = app_ram_size.bit_length()
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if bit_len:
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align_size = 1 << bit_len
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else:
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align_size = 32
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with open(args.output, "w") as fp:
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fp.write("/***********************************************\n")
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fp.write(" * Generated file, do not modify\n")
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fp.write(" **********************************************/\n")
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fp.write("_app_data_align = " + str(align_size) + ";\n")
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fp.write(". = ALIGN(_app_data_align);\n")
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if __name__ == "__main__":
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main()
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