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/* Plugin support for BFD.

   Copyright 2009

   Free Software Foundation, Inc.

   This file is part of BFD, the Binary File Descriptor library.

   This program 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; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but 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 this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

#include "config.h"

#include "bfd.h"

#if BFD_SUPPORTS_PLUGINS

#include <assert.h>

#include <dlfcn.h>

#include <stdarg.h>

#include "plugin-api.h"

#include "sysdep.h"

#include "plugin.h"

#include "libbfd.h"

#include "libiberty.h"

#include <dirent.h>

#define bfd_plugin_close_and_cleanup                  _bfd_generic_close_and_cleanup

#define bfd_plugin_bfd_free_cached_info               _bfd_generic_bfd_free_cached_info

#define bfd_plugin_new_section_hook                   _bfd_generic_new_section_hook

#define bfd_plugin_get_section_contents               _bfd_generic_get_section_contents

#define bfd_plugin_get_section_contents_in_window     _bfd_generic_get_section_contents_in_window

#define bfd_plugin_bfd_copy_private_header_data       _bfd_generic_bfd_copy_private_header_data

#define bfd_plugin_bfd_merge_private_bfd_data         _bfd_generic_bfd_merge_private_bfd_data

#define bfd_plugin_bfd_copy_private_header_data       _bfd_generic_bfd_copy_private_header_data

#define bfd_plugin_bfd_set_private_flags              _bfd_generic_bfd_set_private_flags

#define bfd_plugin_core_file_matches_executable_p     generic_core_file_matches_executable_p

#define bfd_plugin_bfd_is_local_label_name            _bfd_nosymbols_bfd_is_local_label_name

#define bfd_plugin_bfd_is_target_special_symbol       ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)

#define bfd_plugin_get_lineno                         _bfd_nosymbols_get_lineno

#define bfd_plugin_find_nearest_line                  _bfd_nosymbols_find_nearest_line

#define bfd_plugin_find_inliner_info                  _bfd_nosymbols_find_inliner_info

#define bfd_plugin_bfd_make_debug_symbol              _bfd_nosymbols_bfd_make_debug_symbol

#define bfd_plugin_read_minisymbols                   _bfd_generic_read_minisymbols

#define bfd_plugin_minisymbol_to_symbol               _bfd_generic_minisymbol_to_symbol

#define bfd_plugin_set_arch_mach                      bfd_default_set_arch_mach

#define bfd_plugin_set_section_contents               _bfd_generic_set_section_contents

#define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents

#define bfd_plugin_bfd_relax_section                  bfd_generic_relax_section

#define bfd_plugin_bfd_link_hash_table_create         _bfd_generic_link_hash_table_create

#define bfd_plugin_bfd_link_hash_table_free           _bfd_generic_link_hash_table_free

#define bfd_plugin_bfd_link_add_symbols               _bfd_generic_link_add_symbols

#define bfd_plugin_bfd_link_just_syms                 _bfd_generic_link_just_syms

#define bfd_plugin_bfd_final_link                     _bfd_generic_final_link

#define bfd_plugin_bfd_link_split_section             _bfd_generic_link_split_section

#define bfd_plugin_bfd_gc_sections                    bfd_generic_gc_sections

#define bfd_plugin_bfd_merge_sections                 bfd_generic_merge_sections

#define bfd_plugin_bfd_is_group_section               bfd_generic_is_group_section

#define bfd_plugin_bfd_discard_group                  bfd_generic_discard_group

#define bfd_plugin_section_already_linked             _bfd_generic_section_already_linked

#define bfd_plugin_bfd_define_common_symbol           bfd_generic_define_common_symbol

#define bfd_plugin_bfd_copy_link_hash_symbol_type     _bfd_generic_copy_link_hash_symbol_type

static enum ld_plugin_status

message (int level ATTRIBUTE_UNUSED,

         const char * format, ...)

{

  va_list args;

  va_start (args, format);

  printf ("bfd plugin: ");

  vprintf (format, args);

  putchar ('\n');

  va_end (args);

  return LDPS_OK;

}

/* Register a claim-file handler. */

static ld_plugin_claim_file_handler claim_file;

static enum ld_plugin_status

register_claim_file (ld_plugin_claim_file_handler handler)

{

  claim_file = handler;

  return LDPS_OK;

}

static enum ld_plugin_status

add_symbols (void * handle,

             int nsyms,

             const struct ld_plugin_symbol * syms)

{

  bfd *abfd = handle;

  struct plugin_data_struct *plugin_data =

    bfd_alloc (abfd, sizeof (plugin_data_struct));;

  plugin_data->nsyms = nsyms;

  plugin_data->syms = syms;

  if (nsyms != 0)

    abfd->flags |= HAS_SYMS;

  abfd->tdata.plugin_data = plugin_data;

  return LDPS_OK;

}

static const char *plugin_program_name;

void

bfd_plugin_set_program_name (const char *program_name)

{

  plugin_program_name = program_name;

}

static int

try_load_plugin (const char *pname)

{

  static void *plugin_handle;

  int tv_size = 4;

  struct ld_plugin_tv tv[tv_size];

  int i;

  ld_plugin_onload onload;

  enum ld_plugin_status status;

  plugin_handle = dlopen (pname, RTLD_NOW);

  if (!plugin_handle)

    {

      (*_bfd_error_handler)("%s\n", dlerror ());

      return 0;

    }

  onload = dlsym (plugin_handle, "onload");

  if (!onload)

    goto err;

  i = 0;

  tv[i].tv_tag = LDPT_MESSAGE;

  tv[i].tv_u.tv_message = message;

  ++i;

  tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;

  tv[i].tv_u.tv_register_claim_file = register_claim_file;

  ++i;

  tv[i].tv_tag = LDPT_ADD_SYMBOLS;

  tv[i].tv_u.tv_add_symbols = add_symbols;

  ++i;

  tv[i].tv_tag = LDPT_NULL;

  tv[i].tv_u.tv_val = 0;

  status = (*onload)(tv);

  if (status != LDPS_OK)

    goto err;

  if (!claim_file)

    goto err;

  return 1;

 err:

  plugin_handle = NULL;

  return 0;

}

static const char *plugin_name;

void

bfd_plugin_set_plugin (const char *p)

{

  plugin_name = p;

}

static int

load_plugin (void)

{

  char *plugin_dir;

  char *p;

  DIR *d;

  struct dirent *ent;

  int found = 0;

  if (plugin_name)

    return try_load_plugin (plugin_name);

  if (plugin_program_name == NULL)

    return 0;

  plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL);

  p = make_relative_prefix (plugin_program_name,

                            BINDIR,

                            plugin_dir);

  free (plugin_dir);

  plugin_dir = NULL;

  d = opendir (p);

  if (!d)

    goto out;

  while ((ent = readdir (d)))

    {

      char *full_name;

      struct stat s;

      full_name = concat (p, "/", ent->d_name, NULL);

      if (stat(full_name, &s) == 0 && S_ISREG (s.st_mode))

        found = try_load_plugin (full_name);

      free (full_name);

      if (found)

        break;

    }

 out:

  free (p);

  if (d)

    closedir (d);

  return found;

}

static const bfd_target *

bfd_plugin_object_p (bfd *abfd)

{

  int claimed = 0;

  struct ld_plugin_input_file file;

  bfd *iobfd;

  static int have_loaded = 0;

  static int have_plugin = 0;

  if (!have_loaded)

    {

      have_loaded = 1;

      have_plugin = load_plugin ();

    }

  if (!have_plugin)

    return NULL;

  file.name = abfd->filename;

  if (abfd->my_archive)

    {

      iobfd = abfd->my_archive;

      file.offset = abfd->origin;

      file.filesize = arelt_size (abfd);

    }

  else

    {

      iobfd = abfd;

      file.offset = 0;

      file.filesize = 0;

    }

  if (!iobfd->iostream && !bfd_open_file (iobfd))

    return NULL;

  file.fd = fileno ((FILE *) iobfd->iostream);

  if (!abfd->my_archive)

    {

      struct stat stat_buf;

      if (fstat (file.fd, &stat_buf))

        return NULL;

      file.filesize = stat_buf.st_size;

    }

  file.handle = abfd;

  off_t cur_offset = lseek(file.fd, 0, SEEK_CUR);

  claim_file (&file, &claimed);

  lseek(file.fd, cur_offset, SEEK_SET);

  if (!claimed)

    return NULL;

  return abfd->xvec;

}

/* Copy any private info we understand from the input bfd

   to the output bfd.  */

static bfd_boolean

bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,

                                      bfd *obfd ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return TRUE;

}

/* Copy any private info we understand from the input section

   to the output section.  */

static bfd_boolean

bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,

                                          asection *isection ATTRIBUTE_UNUSED,

                                          bfd *obfd ATTRIBUTE_UNUSED,

                                          asection *osection ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return TRUE;

}

/* Copy any private info we understand from the input symbol

   to the output symbol.  */

static bfd_boolean

bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,

                                         asymbol *isymbol ATTRIBUTE_UNUSED,

                                         bfd *obfd ATTRIBUTE_UNUSED,

                                         asymbol *osymbol ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return TRUE;

}

static bfd_boolean

bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return TRUE;

}

static char *

bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return NULL;

}

static int

bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return 0;

}

static int

bfd_plugin_core_file_pid (bfd *abfd ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return 0;

}

static long

bfd_plugin_get_symtab_upper_bound (bfd *abfd)

{

  struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;

  long nsyms = plugin_data->nsyms;

  BFD_ASSERT (nsyms >= 0);

  return ((nsyms + 1) * sizeof (asymbol *));

}

static flagword

convert_flags (const struct ld_plugin_symbol *sym)

{

 switch (sym->def)

   {

   case LDPK_DEF:

   case LDPK_COMMON:

   case LDPK_UNDEF:

     return BSF_GLOBAL;

   case LDPK_WEAKUNDEF:

   case LDPK_WEAKDEF:

     return BSF_GLOBAL | BSF_WEAK;

   default:

     BFD_ASSERT (0);

     return 0;

   }

}

static long

bfd_plugin_canonicalize_symtab (bfd *abfd,

                                asymbol **alocation)

{

  struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;

  long nsyms = plugin_data->nsyms;

  const struct ld_plugin_symbol *syms = plugin_data->syms;

  static asection fake_section;

  static asection fake_common_section;

  int i;

  fake_section.name = ".text";

  fake_common_section.flags = SEC_IS_COMMON;

  for (i = 0; i < nsyms; i++)

    {

      asymbol *s = bfd_alloc (abfd, sizeof (asymbol));

      BFD_ASSERT (s);

      alocation[i] = s;

      s->the_bfd = abfd;

      s->name = syms[i].name;

      s->value = 0;

      s->flags = convert_flags (&syms[i]);

      switch (syms[i].def)

        {

        case LDPK_COMMON:

          s->section = &fake_common_section;

          break;

        case LDPK_UNDEF:

        case LDPK_WEAKUNDEF:

          s->section = bfd_und_section_ptr;

          break;

        case LDPK_DEF:

        case LDPK_WEAKDEF:

          s->section = &fake_section;

          break;

        default:

          BFD_ASSERT (0);

        }

      s->udata.p = (void *) &syms[i];

    }

  return nsyms;

}

static void

bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,

                         PTR afile ATTRIBUTE_UNUSED,

                         asymbol *symbol ATTRIBUTE_UNUSED,

                         bfd_print_symbol_type how ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

}

static void

bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,

                            asymbol *symbol,

                            symbol_info *ret)

{

  bfd_symbol_info (symbol, ret);

}

/* Make an empty symbol. */

static asymbol *

bfd_plugin_make_empty_symbol (bfd *abfd)

{

  asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol));

  if (new_symbol == NULL)

    return new_symbol;

  new_symbol->the_bfd = abfd;

  return new_symbol;

}

static int

bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,

                           struct bfd_link_info *info ATTRIBUTE_UNUSED)

{

  BFD_ASSERT (0);

  return 0;

}

const bfd_target plugin_vec =

{

  "plugin",                     /* Name.  */

  bfd_target_unknown_flavour,

  BFD_ENDIAN_LITTLE,            /* Target byte order.  */

  BFD_ENDIAN_LITTLE,            /* Target headers byte order.  */

  (HAS_RELOC | EXEC_P |         /* Object flags.  */

   HAS_LINENO | HAS_DEBUG |

   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),

  (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS

   | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags.  */

  0,                             /* symbol_leading_char.  */

  '/',                          /* ar_pad_char.  */

  15,                           /* ar_max_namelen.  */

  bfd_getl64, bfd_getl_signed_64, bfd_putl64,

  bfd_getl32, bfd_getl_signed_32, bfd_putl32,

  bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* data */

  bfd_getl64, bfd_getl_signed_64, bfd_putl64,

  bfd_getl32, bfd_getl_signed_32, bfd_putl32,

  bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */

  {                             /* bfd_check_format.  */

    _bfd_dummy_target,

    bfd_plugin_object_p,

    bfd_generic_archive_p,

    _bfd_dummy_target

  },

  {                             /* bfd_set_format.  */

    bfd_false,

    bfd_false,

    _bfd_generic_mkarchive,

    bfd_false,

  },

  {                             /* bfd_write_contents.  */

    bfd_false,

    bfd_false,

    _bfd_write_archive_contents,

    bfd_false,

  },

  BFD_JUMP_TABLE_GENERIC (bfd_plugin),

  BFD_JUMP_TABLE_COPY (bfd_plugin),

  BFD_JUMP_TABLE_CORE (bfd_plugin),

  BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),

  BFD_JUMP_TABLE_SYMBOLS (bfd_plugin),

  BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),

  BFD_JUMP_TABLE_WRITE (bfd_plugin),

  BFD_JUMP_TABLE_LINK (bfd_plugin),

  BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  NULL,

  NULL                          /* backend_data.  */

};

#endif /* BFD_SUPPORTS_PLUGIN */