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Since the introduction of PCAddressMatcher, the executable produced by the build system is passed to elftools.elf.elffile.ELFFile. However on macOS, native executables are not ELF files, so the ELFFile class raises a rather unhelpful AssertionError exception. Given that the rest of the idf_monitor.py doesn't have assumptions that the "elf_file" argument is an ELF file (rather than just an executable), check if the file is a real ELF file inside PCAddressMatcher.
61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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from elftools.elf.constants import SH_FLAGS
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from elftools.elf.elffile import ELFFile
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class PcAddressMatcher(object):
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"""
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Class for detecting potential addresses which will consequently run through the external addr2line command to
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identify and print information about it.
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The input to this class is the path to the ELF file. Addresses of sections with executable flag are stored and
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used later for lookup.
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"""
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def __init__(self, elf_path): # type: (str) -> None
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self.intervals = []
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try:
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with open(elf_path, 'rb') as f:
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# Is this an ELF file?
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elf_magic = f.read(4)
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if elf_magic != b'\x7fELF':
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# Probably not an ELF file
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# (could be Mach-O format on macOS, for example)
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raise NotImplementedError()
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f.seek(0)
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elf = ELFFile(f)
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for section in elf.iter_sections():
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if section['sh_flags'] & SH_FLAGS.SHF_EXECINSTR:
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start = section['sh_addr']
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size = section['sh_size']
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end = start + size
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self.intervals.append((start, end))
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except FileNotFoundError:
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# ELF file is just an optional argument
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pass
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except NotImplementedError:
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pass
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# sort them in order to have faster lookup
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self.intervals = sorted(self.intervals)
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def is_executable_address(self, addr): # type: (int) -> bool
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"""
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Returns True/False if "addr" is in one of the ELF sections with executable flag set.
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"""
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for start, end in self.intervals:
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if start > addr:
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# The intervals are sorted. This means that loop can end because all remaining intervals starts are
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# greater than the current start
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return False
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if start <= addr < end:
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return True
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return False
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