esptool.py 文件源码

def _read_elf_file(self, f):
        # read the ELF file header
        LEN_FILE_HEADER = 0x34
        try:
            (ident,_type,machine,_version,
             self.entrypoint,_phoff,shoff,_flags,
             _ehsize, _phentsize,_phnum, shentsize,
             shnum,shstrndx) = struct.unpack("<16sHHLLLLLHHHHHH", f.read(LEN_FILE_HEADER))
        except struct.error as e:
            raise FatalError("Failed to read a valid ELF header from %s: %s" % (self.name, e))

        if byte(ident, 0) != 0x7f or ident[1:4] != b'ELF':
            raise FatalError("%s has invalid ELF magic header" % self.name)
        if machine != 0x5e:
            raise FatalError("%s does not appear to be an Xtensa ELF file. e_machine=%04x" % (self.name, machine))
        if shentsize != self.LEN_SEC_HEADER:
            raise FatalError("%s has unexpected section header entry size 0x%x (not 0x28)" % (self.name, shentsize, self.LEN_SEC_HEADER))
        if shnum == 0:
            raise FatalError("%s has 0 section headers" % (self.name))
        self._read_sections(f, shoff, shnum, shstrndx)