626 lines
15 KiB
C
626 lines
15 KiB
C
/* Plugin support for BFD.
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Copyright (C) 2009-2016 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#if BFD_SUPPORTS_PLUGINS
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#include <assert.h>
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#elif defined (HAVE_WINDOWS_H)
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#include <windows.h>
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#else
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#error Unknown how to handle dynamic-load-libraries.
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#endif
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#include <stdarg.h>
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#include "plugin-api.h"
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#include "plugin.h"
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#include "libbfd.h"
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#include "libiberty.h"
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#include <dirent.h>
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#if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
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#define RTLD_NOW 0 /* Dummy value. */
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static void *
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dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
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{
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return LoadLibrary (file);
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}
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static void *
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dlsym (void *handle, const char *name)
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{
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return GetProcAddress (handle, name);
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}
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static int ATTRIBUTE_UNUSED
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dlclose (void *handle)
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{
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FreeLibrary (handle);
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return 0;
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}
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static const char *
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dlerror (void)
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{
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return "Unable to load DLL.";
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}
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#endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
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#define bfd_plugin_close_and_cleanup _bfd_generic_close_and_cleanup
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#define bfd_plugin_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
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#define bfd_plugin_new_section_hook _bfd_generic_new_section_hook
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#define bfd_plugin_get_section_contents _bfd_generic_get_section_contents
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#define bfd_plugin_get_section_contents_in_window _bfd_generic_get_section_contents_in_window
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#define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
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#define bfd_plugin_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
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#define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
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#define bfd_plugin_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
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#define bfd_plugin_core_file_matches_executable_p generic_core_file_matches_executable_p
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#define bfd_plugin_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
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#define bfd_plugin_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
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#define bfd_plugin_get_lineno _bfd_nosymbols_get_lineno
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#define bfd_plugin_find_nearest_line _bfd_nosymbols_find_nearest_line
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#define bfd_plugin_find_line _bfd_nosymbols_find_line
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#define bfd_plugin_find_inliner_info _bfd_nosymbols_find_inliner_info
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#define bfd_plugin_get_symbol_version_string _bfd_nosymbols_get_symbol_version_string
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#define bfd_plugin_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
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#define bfd_plugin_read_minisymbols _bfd_generic_read_minisymbols
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#define bfd_plugin_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
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#define bfd_plugin_set_arch_mach bfd_default_set_arch_mach
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#define bfd_plugin_set_section_contents _bfd_generic_set_section_contents
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#define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
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#define bfd_plugin_bfd_relax_section bfd_generic_relax_section
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#define bfd_plugin_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
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#define bfd_plugin_bfd_link_add_symbols _bfd_generic_link_add_symbols
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#define bfd_plugin_bfd_link_just_syms _bfd_generic_link_just_syms
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#define bfd_plugin_bfd_final_link _bfd_generic_final_link
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#define bfd_plugin_bfd_link_split_section _bfd_generic_link_split_section
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#define bfd_plugin_bfd_gc_sections bfd_generic_gc_sections
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#define bfd_plugin_bfd_lookup_section_flags bfd_generic_lookup_section_flags
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#define bfd_plugin_bfd_merge_sections bfd_generic_merge_sections
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#define bfd_plugin_bfd_is_group_section bfd_generic_is_group_section
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#define bfd_plugin_bfd_discard_group bfd_generic_discard_group
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#define bfd_plugin_section_already_linked _bfd_generic_section_already_linked
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#define bfd_plugin_bfd_define_common_symbol bfd_generic_define_common_symbol
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#define bfd_plugin_bfd_copy_link_hash_symbol_type _bfd_generic_copy_link_hash_symbol_type
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#define bfd_plugin_bfd_link_check_relocs _bfd_generic_link_check_relocs
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static enum ld_plugin_status
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message (int level ATTRIBUTE_UNUSED,
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const char * format, ...)
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{
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va_list args;
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va_start (args, format);
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printf ("bfd plugin: ");
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vprintf (format, args);
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putchar ('\n');
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va_end (args);
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return LDPS_OK;
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}
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/* Register a claim-file handler. */
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static ld_plugin_claim_file_handler claim_file;
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static enum ld_plugin_status
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register_claim_file (ld_plugin_claim_file_handler handler)
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{
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claim_file = handler;
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return LDPS_OK;
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}
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static enum ld_plugin_status
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add_symbols (void * handle,
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int nsyms,
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const struct ld_plugin_symbol * syms)
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{
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bfd *abfd = handle;
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struct plugin_data_struct *plugin_data =
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bfd_alloc (abfd, sizeof (plugin_data_struct));
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plugin_data->nsyms = nsyms;
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plugin_data->syms = syms;
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if (nsyms != 0)
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abfd->flags |= HAS_SYMS;
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abfd->tdata.plugin_data = plugin_data;
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return LDPS_OK;
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}
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static const char *plugin_program_name;
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void
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bfd_plugin_set_program_name (const char *program_name)
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{
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plugin_program_name = program_name;
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}
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static int
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try_claim (bfd *abfd)
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{
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int claimed = 0;
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struct ld_plugin_input_file file;
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bfd *iobfd;
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file.name = abfd->filename;
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if (abfd->my_archive && !bfd_is_thin_archive (abfd->my_archive))
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{
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iobfd = abfd->my_archive;
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file.offset = abfd->origin;
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file.filesize = arelt_size (abfd);
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}
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else
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{
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iobfd = abfd;
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file.offset = 0;
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file.filesize = 0;
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}
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if (!iobfd->iostream && !bfd_open_file (iobfd))
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return 0;
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file.fd = fileno ((FILE *) iobfd->iostream);
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if (!abfd->my_archive || bfd_is_thin_archive (abfd->my_archive))
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{
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struct stat stat_buf;
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if (fstat (file.fd, &stat_buf))
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return 0;
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file.filesize = stat_buf.st_size;
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}
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file.handle = abfd;
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off_t cur_offset = lseek(file.fd, 0, SEEK_CUR);
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claim_file (&file, &claimed);
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lseek(file.fd, cur_offset, SEEK_SET);
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if (!claimed)
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return 0;
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return 1;
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}
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static int
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try_load_plugin (const char *pname, bfd *abfd, int *has_plugin_p)
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{
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void *plugin_handle;
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struct ld_plugin_tv tv[4];
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int i;
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ld_plugin_onload onload;
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enum ld_plugin_status status;
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*has_plugin_p = 0;
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plugin_handle = dlopen (pname, RTLD_NOW);
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if (!plugin_handle)
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{
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(*_bfd_error_handler)("%s\n", dlerror ());
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return 0;
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}
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onload = dlsym (plugin_handle, "onload");
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if (!onload)
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goto err;
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i = 0;
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tv[i].tv_tag = LDPT_MESSAGE;
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tv[i].tv_u.tv_message = message;
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++i;
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tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
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tv[i].tv_u.tv_register_claim_file = register_claim_file;
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++i;
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tv[i].tv_tag = LDPT_ADD_SYMBOLS;
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tv[i].tv_u.tv_add_symbols = add_symbols;
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++i;
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tv[i].tv_tag = LDPT_NULL;
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tv[i].tv_u.tv_val = 0;
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status = (*onload)(tv);
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if (status != LDPS_OK)
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goto err;
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*has_plugin_p = 1;
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abfd->plugin_format = bfd_plugin_no;
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if (!claim_file)
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goto err;
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if (!try_claim (abfd))
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goto err;
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abfd->plugin_format = bfd_plugin_yes;
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return 1;
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err:
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return 0;
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}
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/* There may be plugin libraries in lib/bfd-plugins. */
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static int has_plugin = -1;
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static const bfd_target *(*ld_plugin_object_p) (bfd *);
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static const char *plugin_name;
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void
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bfd_plugin_set_plugin (const char *p)
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{
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plugin_name = p;
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has_plugin = p != NULL;
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}
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/* Return TRUE if a plugin library is used. */
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bfd_boolean
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bfd_plugin_specified_p (void)
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{
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return has_plugin > 0;
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}
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/* Return TRUE if ABFD can be claimed by linker LTO plugin. */
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bfd_boolean
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bfd_link_plugin_object_p (bfd *abfd)
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{
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if (ld_plugin_object_p)
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return ld_plugin_object_p (abfd) != NULL;
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return FALSE;
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}
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extern const bfd_target plugin_vec;
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/* Return TRUE if TARGET is a pointer to plugin_vec. */
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bfd_boolean
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bfd_plugin_target_p (const bfd_target *target)
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{
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return target == &plugin_vec;
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}
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/* Register OBJECT_P to be used by bfd_plugin_object_p. */
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void
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register_ld_plugin_object_p (const bfd_target *(*object_p) (bfd *))
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{
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ld_plugin_object_p = object_p;
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}
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static int
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load_plugin (bfd *abfd)
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{
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char *plugin_dir;
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char *p;
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DIR *d;
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struct dirent *ent;
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int found = 0;
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if (!has_plugin)
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return found;
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if (plugin_name)
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return try_load_plugin (plugin_name, abfd, &has_plugin);
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if (plugin_program_name == NULL)
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return found;
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plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL);
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p = make_relative_prefix (plugin_program_name,
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BINDIR,
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plugin_dir);
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free (plugin_dir);
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plugin_dir = NULL;
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d = opendir (p);
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if (!d)
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goto out;
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while ((ent = readdir (d)))
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{
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char *full_name;
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struct stat s;
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int valid_plugin;
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full_name = concat (p, "/", ent->d_name, NULL);
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if (stat(full_name, &s) == 0 && S_ISREG (s.st_mode))
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found = try_load_plugin (full_name, abfd, &valid_plugin);
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if (has_plugin <= 0)
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has_plugin = valid_plugin;
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free (full_name);
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if (found)
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break;
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}
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out:
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free (p);
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if (d)
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closedir (d);
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return found;
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}
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static const bfd_target *
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bfd_plugin_object_p (bfd *abfd)
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{
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if (ld_plugin_object_p)
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return ld_plugin_object_p (abfd);
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if (abfd->plugin_format == bfd_plugin_unknown && !load_plugin (abfd))
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return NULL;
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return abfd->plugin_format == bfd_plugin_yes ? abfd->xvec : NULL;
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}
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/* Copy any private info we understand from the input bfd
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to the output bfd. */
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static bfd_boolean
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bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,
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bfd *obfd ATTRIBUTE_UNUSED)
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{
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BFD_ASSERT (0);
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return TRUE;
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}
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/* Copy any private info we understand from the input section
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to the output section. */
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static bfd_boolean
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bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
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asection *isection ATTRIBUTE_UNUSED,
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bfd *obfd ATTRIBUTE_UNUSED,
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asection *osection ATTRIBUTE_UNUSED)
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{
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BFD_ASSERT (0);
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return TRUE;
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}
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/* Copy any private info we understand from the input symbol
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to the output symbol. */
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static bfd_boolean
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bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
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asymbol *isymbol ATTRIBUTE_UNUSED,
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bfd *obfd ATTRIBUTE_UNUSED,
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asymbol *osymbol ATTRIBUTE_UNUSED)
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{
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BFD_ASSERT (0);
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return TRUE;
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}
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static bfd_boolean
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bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED)
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{
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BFD_ASSERT (0);
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return TRUE;
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}
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static char *
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bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
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{
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BFD_ASSERT (0);
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return NULL;
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}
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static int
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bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
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{
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BFD_ASSERT (0);
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return 0;
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}
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static int
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bfd_plugin_core_file_pid (bfd *abfd ATTRIBUTE_UNUSED)
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{
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BFD_ASSERT (0);
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return 0;
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}
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static long
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bfd_plugin_get_symtab_upper_bound (bfd *abfd)
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{
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struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
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long nsyms = plugin_data->nsyms;
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BFD_ASSERT (nsyms >= 0);
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return ((nsyms + 1) * sizeof (asymbol *));
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}
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static flagword
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convert_flags (const struct ld_plugin_symbol *sym)
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{
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switch (sym->def)
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{
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case LDPK_DEF:
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case LDPK_COMMON:
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case LDPK_UNDEF:
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return BSF_GLOBAL;
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case LDPK_WEAKUNDEF:
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case LDPK_WEAKDEF:
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return BSF_GLOBAL | BSF_WEAK;
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default:
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BFD_ASSERT (0);
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return 0;
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}
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}
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static long
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bfd_plugin_canonicalize_symtab (bfd *abfd,
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asymbol **alocation)
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{
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struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
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long nsyms = plugin_data->nsyms;
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const struct ld_plugin_symbol *syms = plugin_data->syms;
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static asection fake_section;
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static asection fake_common_section;
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int i;
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fake_section.name = ".text";
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fake_common_section.flags = SEC_IS_COMMON;
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for (i = 0; i < nsyms; i++)
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{
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asymbol *s = bfd_alloc (abfd, sizeof (asymbol));
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BFD_ASSERT (s);
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alocation[i] = s;
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s->the_bfd = abfd;
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s->name = syms[i].name;
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s->value = 0;
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s->flags = convert_flags (&syms[i]);
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switch (syms[i].def)
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{
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case LDPK_COMMON:
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s->section = &fake_common_section;
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break;
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case LDPK_UNDEF:
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case LDPK_WEAKUNDEF:
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s->section = bfd_und_section_ptr;
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break;
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case LDPK_DEF:
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case LDPK_WEAKDEF:
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s->section = &fake_section;
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break;
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default:
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BFD_ASSERT (0);
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}
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s->udata.p = (void *) &syms[i];
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}
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return nsyms;
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}
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static void
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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. */
|
|
255, /* match priority. */
|
|
|
|
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),
|
|
#ifdef USE_64_BIT_ARCHIVE
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_64_bit),
|
|
#else
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
|
|
#endif
|
|
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 */
|