49206a86ff
This adds a very primitive coredump mechanism under subsys/debug where during fatal error, register and memory content can be dumped to coredump backend. One such backend utilizing log module for output is included. Once the coredump log is converted to a binary file, it can be used with the ELF output file as inputs to an overly simplified implementation of a GDB server. This GDB server can be attached via the target remote command of GDB and will be serving register and memory content. This allows using GDB to examine stack and memory where the fatal error occurred. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
94 lines
2.7 KiB
Python
94 lines
2.7 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (c) 2020 Intel Corporation
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#
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# SPDX-License-Identifier: Apache-2.0
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import logging
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import elftools
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from elftools.elf.elffile import ELFFile
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# ELF section flags
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SHF_WRITE = 0x1
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SHF_ALLOC = 0x2
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SHF_EXEC = 0x4
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SHF_WRITE_ALLOC = SHF_WRITE | SHF_ALLOC
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SHF_ALLOC_EXEC = SHF_ALLOC | SHF_EXEC
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logger = logging.getLogger("parser")
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class CoredumpElfFile():
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"""
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Class to parse ELF file for memory content in various sections.
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There are read-only sections (e.g. text and rodata) where
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the memory content does not need to be dumped via coredump
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and can be retrived from the ELF file.
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"""
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def __init__(self, elffile):
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self.elffile = elffile
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self.fd = None
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self.elf = None
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self.memory_regions = list()
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def open(self):
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self.fd = open(self.elffile, "rb")
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self.elf = ELFFile(self.fd)
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def close(self):
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self.fd.close()
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def get_memory_regions(self):
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return self.memory_regions
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def parse(self):
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if self.fd is None:
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self.open()
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for section in self.elf.iter_sections():
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# REALLY NEED to match exact type as all other sections
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# (debug, text, etc.) are descendants where
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# isinstance() would match.
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if type(section) is not elftools.elf.sections.Section: # pylint: disable=unidiomatic-typecheck
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continue
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size = section['sh_size']
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flags = section['sh_flags']
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sec_start = section['sh_addr']
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sec_end = sec_start + size - 1
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store = False
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sect_desc = "?"
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if section['sh_type'] == 'SHT_PROGBITS':
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if (flags & SHF_ALLOC_EXEC) == SHF_ALLOC_EXEC:
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# Text section
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store = True
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sect_desc = "text"
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elif (flags & SHF_WRITE_ALLOC) == SHF_WRITE_ALLOC:
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# Data section
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#
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# Running app changes the content so no need
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# to store
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pass
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elif (flags & SHF_ALLOC) == SHF_ALLOC:
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# Read only data section
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store = True
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sect_desc = "read-only data"
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if store:
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mem_region = {"start": sec_start, "end": sec_end, "data": section.data()}
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logger.info("ELF Section: 0x%x to 0x%x of size %d (%s)" %
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(mem_region["start"],
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mem_region["end"],
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len(mem_region["data"]),
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sect_desc))
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self.memory_regions.append(mem_region)
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return True
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