libdwfl/dwfl_module_report_build_id.c

/* Report build ID information for a module.
   Copyright (C) 2007, 2008 Red Hat, Inc.
   This file is part of Red Hat elfutils.

   Red Hat elfutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by the
   Free Software Foundation; version 2 of the License.

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   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

   In addition, as a special exception, Red Hat, Inc. gives You the
   additional right to link the code of Red Hat elfutils with code licensed
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   this file solely under the GPL without exception.

   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
   license is granted, either expressly or impliedly, by designation as an
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#include "libdwflP.h"

// XXX vs report changed module: punting old file
int
dwfl_module_report_build_id (Dwfl_Module *mod,
			     const unsigned char *bits, size_t len,
			     GElf_Addr vaddr)
{
  if (mod == NULL)
    return -1;

  if (mod->main.elf != NULL)
    {
      /* Once we know about a file, we won't take any lies about
	 its contents.  The only permissible call is a no-op.  */

      if ((size_t) mod->build_id_len == len
	  && (mod->build_id_vaddr == vaddr || vaddr == 0)
	  && !memcmp (bits, mod->build_id_bits, len))
	return 0;

      __libdwfl_seterrno (DWFL_E_ALREADY_ELF);
      return -1;
    }

  if (vaddr != 0 && (vaddr < mod->low_addr || vaddr + len > mod->high_addr))
    {
      __libdwfl_seterrno (DWFL_E_ADDR_OUTOFRANGE);
      return -1;
    }

  void *copy = NULL;
  if (len > 0)
    {
      copy = malloc (len);
      if (unlikely (copy == NULL))
	{
	  __libdwfl_seterrno (DWFL_E_NOMEM);
	  return -1;
	}
      memcpy (copy, bits, len);
    }

  free (mod->build_id_bits);

  mod->build_id_bits = copy;
  mod->build_id_len = len;
  mod->build_id_vaddr = vaddr;

  return 0;
}
INTDEF (dwfl_module_report_build_id)