diff options
Diffstat (limited to 'bfd/plugin.c')
| -rw-r--r-- | bfd/plugin.c | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/bfd/plugin.c b/bfd/plugin.c new file mode 100644 index 0000000..49395e8 --- /dev/null +++ b/bfd/plugin.c @@ -0,0 +1,488 @@ +/* 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 <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 + +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); + 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; +} + +extern char *program_name __attribute__ ((weak)); + +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 (!program_name) + return 0; + + plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL); + p = make_relative_prefix (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; + if (ent->d_type != DT_REG && ent->d_type != DT_LNK) + continue; + + full_name = concat (p, "/", ent->d_name, NULL); + 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; + int t = load_plugin (); + struct ld_plugin_input_file file; + if (!t) + return NULL; + + file.name = abfd->filename; + + if (abfd->iostream) + { + file.fd = fileno (abfd->iostream); + file.offset = 0; + file.filesize = 0; /*FIXME*/ + } + else + { + bfd *archive = abfd->my_archive; + BFD_ASSERT (archive); + file.fd = fileno (archive->iostream); + file.offset = abfd->origin; + file.filesize = arelt_size (abfd); + + } + file.handle = abfd; + claim_file (&file, &claimed); + 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 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 = bfd_zalloc (abfd, sizeof (asymbol)); + if (new == NULL) + return new; + new->the_bfd = abfd; + return new; +} + +static int +bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED) +{ + BFD_ASSERT (0); + return 0; +} + +static bfd_boolean +bfd_plugin_mkobject (bfd *abfd 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_plugin_mkobject, + _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. */ +}; 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