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87 lines
3.2 KiB
Python
87 lines
3.2 KiB
Python
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#! /usr/bin/env python
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# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# elf_sections.py
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# This script analyses the specified .elf and provides output similar to readelf -S.
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# The sections are sorted by start address and gaps/overlaps in the memory map are displayed.
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import argparse
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from elftools.elf.elffile import ELFFile
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EXCLUDED_SECTIONS = ['.log_strings']
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BT_DIALOG_SECTION_START = ('** RAM Start **', 0x7FC0000, 0)
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BT_DIALOG_SECTION_END = ('** RAM End **', 0x7FE3FFF, 0)
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# Return a list of sections as a tuple (name, start address, size)
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def _get_sections(elf, all_sections):
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headers = []
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for nsec, section in enumerate(elf.iter_sections()):
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if not all_sections:
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if section['sh_addr'] == 0 or section['sh_size'] == 0 or \
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section.name in EXCLUDED_SECTIONS:
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continue
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headers.append((section.name, section['sh_addr'], section['sh_size']))
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return headers
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def _process_elf(filename, verbose=False, all_sections=False, bt=False):
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with open(filename, 'rb') as f:
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elffile = ELFFile(f)
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# Sort by the second element (start address)
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sections = sorted(_get_sections(elffile, all_sections), key=lambda x: x[1])
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if bt:
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sections.insert(0, BT_DIALOG_SECTION_START)
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sections.append(BT_DIALOG_SECTION_END)
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print '%-20s %10s %7s %16s\n' % \
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('Section Name', 'Start Addr', 'Size', 'Gap Before Section')
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previous_section_end_addr = None
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for s in sections:
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# Handle the first sections
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if previous_section_end_addr is None:
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previous_section_end_addr = s[1] - 1
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gap = 0
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else:
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gap = s[1] - previous_section_end_addr - 1
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if gap == 0:
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print '%-20s 0x%08X 0x%05X' % (s[0], s[1], s[2])
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elif gap > 0:
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print '%-20s 0x%08X 0x%05X 0x%06X' % (s[0], s[1], s[2], gap)
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elif gap < 0:
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gap *= -1
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print '%-20s 0x%08X 0x%05X 0x%06X *** OVERLAP ***' % \
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(s[0], s[1], s[2], gap)
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previous_section_end_addr = s[1] + s[2] - 1
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument('-v', '--verbose', action='store_true')
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parser.add_argument('-a', '--all', action='store_true', help='Show all sections')
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parser.add_argument('-b', '--bt', action='store_true', help='Dialog BT .elf')
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parser.add_argument('elf_file', help='Extracts section info from elf file.')
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args = parser.parse_args()
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_process_elf(args.elf_file, verbose=args.verbose, all_sections=args.all, bt=args.bt)
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