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cell-binutils  2.17cvs20070401
elfcore.h File Reference
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char * elf_core_file_failing_command (bfd *abfd)
int elf_core_file_failing_signal (bfd *abfd)
bfd_boolean elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
const bfd_targetelf_core_file_p (bfd *abfd)

Function Documentation

Definition at line 22 of file elfcore.h.

  return elf_tdata (abfd)->core_command;

Definition at line 28 of file elfcore.h.

  return elf_tdata (abfd)->core_signal;
bfd_boolean elf_core_file_matches_executable_p ( bfd core_bfd,
bfd exec_bfd 

Definition at line 34 of file elfcore.h.

  char* corename;

  /* xvecs must match if both are ELF files for the same target.  */

  if (core_bfd->xvec != exec_bfd->xvec)
      bfd_set_error (bfd_error_system_call);
      return FALSE;

  /* See if the name in the corefile matches the executable name.  */
  corename = elf_tdata (core_bfd)->core_program;
  if (corename != NULL)
      const char* execname = strrchr (exec_bfd->filename, '/');

      execname = execname ? execname + 1 : exec_bfd->filename;

      if (strcmp (execname, corename) != 0)
       return FALSE;

  return TRUE;

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Definition at line 73 of file elfcore.h.

  Elf_External_Ehdr x_ehdr; /* Elf file header, external form.  */
  Elf_Internal_Ehdr *i_ehdrp;      /* Elf file header, internal form.  */
  Elf_Internal_Phdr *i_phdrp;      /* Elf program header, internal form.  */
  unsigned int phindex;
  const struct elf_backend_data *ebd;
  struct bfd_preserve preserve;
  bfd_size_type amt;

  preserve.marker = NULL;

  /* Read in the ELF header in external format.  */
  if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr))
      if (bfd_get_error () != bfd_error_system_call)
       goto wrong;
       goto fail;

  /* Check the magic number.  */
  if (! elf_file_p (&x_ehdr))
    goto wrong;

  /* FIXME: Check EI_VERSION here !  */

  /* Check the address size ("class").  */
  if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
    goto wrong;

  /* Check the byteorder.  */
  switch (x_ehdr.e_ident[EI_DATA])
    case ELFDATA2MSB:              /* Big-endian.  */
      if (! bfd_big_endian (abfd))
       goto wrong;
    case ELFDATA2LSB:              /* Little-endian.  */
      if (! bfd_little_endian (abfd))
       goto wrong;
      goto wrong;

  if (!bfd_preserve_save (abfd, &preserve))
    goto fail;

  /* Give abfd an elf_obj_tdata.  */
  if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd))
    goto fail;
  preserve.marker = elf_tdata (abfd);

  /* Swap in the rest of the header, now that we have the byte order.  */
  i_ehdrp = elf_elfheader (abfd);
  elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);

#if DEBUG & 1
  elf_debug_file (i_ehdrp);

  ebd = get_elf_backend_data (abfd);

  /* Check that the ELF e_machine field matches what this particular
     BFD format expects.  */

  if (ebd->elf_machine_code != i_ehdrp->e_machine
      && (ebd->elf_machine_alt1 == 0
         || i_ehdrp->e_machine != ebd->elf_machine_alt1)
      && (ebd->elf_machine_alt2 == 0
         || i_ehdrp->e_machine != ebd->elf_machine_alt2))
      const bfd_target * const *target_ptr;

      if (ebd->elf_machine_code != EM_NONE)
       goto wrong;

      /* This is the generic ELF target.  Let it match any ELF target
        for which we do not have a specific backend.  */

      for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
         const struct elf_backend_data *back;

         if ((*target_ptr)->flavour != bfd_target_elf_flavour)
         back = (const struct elf_backend_data *) (*target_ptr)->backend_data;
         if (back->elf_machine_code == i_ehdrp->e_machine
             || (back->elf_machine_alt1 != 0
                 && i_ehdrp->e_machine == back->elf_machine_alt1)
             || (back->elf_machine_alt2 != 0
                 && i_ehdrp->e_machine == back->elf_machine_alt2))
             /* target_ptr is an ELF backend which matches this
               object file, so reject the generic ELF target.  */
             goto wrong;

  /* If there is no program header, or the type is not a core file, then
     we are hosed.  */
  if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE)
    goto wrong;

  /* Does BFD's idea of the phdr size match the size
     recorded in the file? */
  if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr))
    goto wrong;

  /* Move to the start of the program headers.  */
  if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0)
    goto wrong;

  /* Allocate space for the program headers.  */
  amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum;
  i_phdrp = bfd_alloc (abfd, amt);
  if (!i_phdrp)
    goto fail;

  elf_tdata (abfd)->phdr = i_phdrp;

  /* Read and convert to internal form.  */
  for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
      Elf_External_Phdr x_phdr;

      if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr))
       goto fail;

      elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);

  /* Set the machine architecture.  Do this before processing the
     program headers since we need to know the architecture type
     when processing the notes of some systems' core files.  */
  if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)
      /* It's OK if this fails for the generic target.  */
      && ebd->elf_machine_code != EM_NONE)
    goto fail;

  /* Let the backend double check the format and override global
     information.  We do this before processing the program headers
     to allow the correct machine (as opposed to just the default
     machine) to be set, making it possible for grok_prstatus and
     grok_psinfo to rely on the mach setting.  */
  if (ebd->elf_backend_object_p != NULL
      && ! ebd->elf_backend_object_p (abfd))
    goto wrong;

  /* Process each program header.  */
  for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
    if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex))
      goto fail;

  /* Save the entry point from the ELF header.  */
  bfd_get_start_address (abfd) = i_ehdrp->e_entry;

  bfd_preserve_finish (abfd, &preserve);
  return abfd->xvec;

  /* There is way too much undoing of half-known state here.  The caller,
     bfd_check_format_matches, really shouldn't iterate on live bfd's to
     check match/no-match like it does.  We have to rely on that a call to
     bfd_default_set_arch_mach with the previously known mach, undoes what
     was done by the first bfd_default_set_arch_mach (with mach 0) here.
     For this to work, only elf-data and the mach may be changed by the
     target-specific elf_backend_object_p function.  Note that saving the
     whole bfd here and restoring it would be even worse; the first thing
     you notice is that the cached bfd file position gets out of sync.  */
  bfd_set_error (bfd_error_wrong_format);

  if (preserve.marker != NULL)
    bfd_preserve_restore (abfd, &preserve);
  return NULL;

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