1 /* Plugin control for the GNU linker.
2 Copyright 2010 Free Software Foundation, Inc.
4 This file is part of the GNU Binutils.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
22 #include "libiberty.h"
33 #include "plugin-api.h"
35 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
39 /* The suffix to append to the name of the real (claimed) object file
40 when generating a dummy BFD to hold the IR symbols sent from the
42 #define IRONLY_SUFFIX ".ironly\004"
44 /* This is sizeof an array of chars, not sizeof a const char *. We
45 also have to avoid inadvertently counting the trailing NUL. */
46 #define IRONLY_SUFFIX_LEN (sizeof (IRONLY_SUFFIX) - 1)
48 /* Stores a single argument passed to a plugin. */
49 typedef struct plugin_arg
51 struct plugin_arg
*next
;
55 /* Holds all details of a single plugin. */
58 /* Next on the list of plugins, or NULL at end of chain. */
60 /* The argument string given to --plugin. */
62 /* The shared library handle returned by dlopen. */
64 /* The list of argument string given to --plugin-opt. */
66 /* Number of args in the list, for convenience. */
68 /* The plugin's event handlers. */
69 ld_plugin_claim_file_handler claim_file_handler
;
70 ld_plugin_all_symbols_read_handler all_symbols_read_handler
;
71 ld_plugin_cleanup_handler cleanup_handler
;
72 /* TRUE if the cleanup handlers have been called. */
73 bfd_boolean cleanup_done
;
76 /* The master list of all plugins. */
77 static plugin_t
*plugins_list
= NULL
;
79 /* We keep a tail pointer for easy linking on the end. */
80 static plugin_t
**plugins_tail_chain_ptr
= &plugins_list
;
82 /* The last plugin added to the list, for receiving args. */
83 static plugin_t
*last_plugin
= NULL
;
85 /* The tail of the arg chain of the last plugin added to the list. */
86 static plugin_arg_t
**last_plugin_args_tail_chain_ptr
= NULL
;
88 /* The plugin which is currently having a callback executed. */
89 static plugin_t
*called_plugin
= NULL
;
91 /* Last plugin to cause an error, if any. */
92 static const char *error_plugin
= NULL
;
94 /* A hash table that records symbols referenced by non-IR files. Used
95 at get_symbols time to determine whether any prevailing defs from
96 IR files are referenced only from other IR files, so tthat we can
97 we can distinguish the LDPR_PREVAILING_DEF and LDPR_PREVAILING_DEF_IRONLY
98 cases when establishing symbol resolutions. */
99 static struct bfd_hash_table
*non_ironly_hash
= NULL
;
101 /* Set at all symbols read time, to avoid recursively offering the plugin
102 its own newly-added input files and libs to claim. */
103 static bfd_boolean no_more_claiming
= FALSE
;
105 /* If the --allow-multiple-definition command-line option is active, we
106 have to disable it so that BFD always calls our hook, and simulate the
107 effect (when not resolving IR vs. real symbols) ourselves by ensuring
108 TRUE is returned from the hook. */
109 static bfd_boolean plugin_cached_allow_multiple_defs
= FALSE
;
111 /* List of tags to set in the constant leading part of the tv array. */
112 static const enum ld_plugin_tag tv_header_tags
[] =
119 LDPT_REGISTER_CLAIM_FILE_HOOK
,
120 LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK
,
121 LDPT_REGISTER_CLEANUP_HOOK
,
124 LDPT_RELEASE_INPUT_FILE
,
127 LDPT_ADD_INPUT_LIBRARY
,
128 LDPT_SET_EXTRA_LIBRARY_PATH
131 /* How many entries in the constant leading part of the tv array. */
132 static const size_t tv_header_size
= ARRAY_SIZE (tv_header_tags
);
134 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
136 #define RTLD_NOW 0 /* Dummy value. */
139 dlopen (const char *file
, int mode ATTRIBUTE_UNUSED
)
141 return LoadLibrary (file
);
145 dlsym (void *handle
, const char *name
)
147 return GetProcAddress (handle
, name
);
151 dlclose (void *handle
)
153 FreeLibrary (handle
);
157 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
159 /* Helper function for exiting with error status. */
161 set_plugin_error (const char *plugin
)
163 error_plugin
= plugin
;
167 /* Test if an error occurred. */
169 plugin_error_p (void)
171 return error_plugin
!= NULL
;
174 /* Return name of plugin which caused an error if any. */
175 const char *plugin_error_plugin (void)
177 return error_plugin
? error_plugin
: _("<no plugin>");
180 /* Handle -plugin arg: find and load plugin, or return error. */
181 int plugin_opt_plugin (const char *plugin
)
185 newplug
= xmalloc (sizeof *newplug
);
186 memset (newplug
, 0, sizeof *newplug
);
187 newplug
->name
= plugin
;
188 newplug
->dlhandle
= dlopen (plugin
, RTLD_NOW
);
189 if (!newplug
->dlhandle
)
190 return set_plugin_error (plugin
);
192 /* Chain on end, so when we run list it is in command-line order. */
193 *plugins_tail_chain_ptr
= newplug
;
194 plugins_tail_chain_ptr
= &newplug
->next
;
196 /* Record it as current plugin for receiving args. */
197 last_plugin
= newplug
;
198 last_plugin_args_tail_chain_ptr
= &newplug
->args
;
202 /* Accumulate option arguments for last-loaded plugin, or return
204 int plugin_opt_plugin_arg (const char *arg
)
206 plugin_arg_t
*newarg
;
209 return set_plugin_error (_("<no plugin>"));
211 newarg
= xmalloc (sizeof *newarg
);
215 /* Chain on end to preserve command-line order. */
216 *last_plugin_args_tail_chain_ptr
= newarg
;
217 last_plugin_args_tail_chain_ptr
= &newarg
->next
;
218 last_plugin
->n_args
++;
222 /* Create a dummy BFD. */
224 plugin_get_ir_dummy_bfd (const char *name
, bfd
*srctemplate
)
229 bfd_use_reserved_id
= 1;
230 abfd
= bfd_create (concat (name
, IRONLY_SUFFIX
, (const char *)NULL
),
232 bfd_set_arch_info (abfd
, bfd_get_arch_info (srctemplate
));
233 bfd_make_writable (abfd
);
234 /* Create a minimal set of sections to own the symbols. */
235 sec
= bfd_make_section_old_way (abfd
, ".text");
236 bfd_set_section_flags (abfd
, sec
,
237 (SEC_CODE
| SEC_HAS_CONTENTS
| SEC_READONLY
238 | SEC_ALLOC
| SEC_LOAD
| SEC_KEEP
));
239 sec
->output_section
= sec
;
240 sec
->output_offset
= 0;
244 /* Check if the BFD is an IR dummy. */
246 is_ir_dummy_bfd (const bfd
*abfd
)
252 namlen
= strlen (abfd
->filename
);
253 if (namlen
< IRONLY_SUFFIX_LEN
)
255 return !strcmp (abfd
->filename
+ namlen
- IRONLY_SUFFIX_LEN
, IRONLY_SUFFIX
);
258 /* Helpers to convert between BFD and GOLD symbol formats. */
259 static enum ld_plugin_status
260 asymbol_from_plugin_symbol (bfd
*abfd
, asymbol
*asym
,
261 const struct ld_plugin_symbol
*ldsym
)
263 flagword flags
= BSF_NO_FLAGS
;
264 struct bfd_section
*section
;
266 asym
->the_bfd
= abfd
;
267 asym
->name
= ldsym
->version
268 ? concat (ldsym
->name
, "@", ldsym
->version
, NULL
)
278 section
= bfd_get_section_by_name (abfd
, ".text");
285 section
= bfd_und_section_ptr
;
290 section
= bfd_com_section_ptr
;
291 asym
->value
= ldsym
->size
;
298 asym
->section
= section
;
300 /* Visibility only applies on ELF targets. */
301 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
303 elf_symbol_type
*elfsym
= elf_symbol_from (abfd
, asym
);
305 einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!"), asym
->name
);
306 elfsym
->internal_elf_sym
.st_other
&= ~3;
307 elfsym
->internal_elf_sym
.st_other
|= ldsym
->visibility
;
313 /* Register a claim-file handler. */
314 static enum ld_plugin_status
315 register_claim_file (ld_plugin_claim_file_handler handler
)
317 ASSERT (called_plugin
);
318 called_plugin
->claim_file_handler
= handler
;
322 /* Register an all-symbols-read handler. */
323 static enum ld_plugin_status
324 register_all_symbols_read (ld_plugin_all_symbols_read_handler handler
)
326 ASSERT (called_plugin
);
327 called_plugin
->all_symbols_read_handler
= handler
;
331 /* Register a cleanup handler. */
332 static enum ld_plugin_status
333 register_cleanup (ld_plugin_cleanup_handler handler
)
335 ASSERT (called_plugin
);
336 called_plugin
->cleanup_handler
= handler
;
340 /* Add symbols from a plugin-claimed input file. */
341 static enum ld_plugin_status
342 add_symbols (void *handle
, int nsyms
, const struct ld_plugin_symbol
*syms
)
347 ASSERT (called_plugin
);
348 symptrs
= xmalloc (nsyms
* sizeof *symptrs
);
349 for (n
= 0; n
< nsyms
; n
++)
351 enum ld_plugin_status rv
;
352 asymbol
*bfdsym
= bfd_make_empty_symbol (abfd
);
354 rv
= asymbol_from_plugin_symbol (abfd
, bfdsym
, syms
+ n
);
358 bfd_set_symtab (abfd
, symptrs
, nsyms
);
362 /* Get the input file information with an open (possibly re-opened)
364 static enum ld_plugin_status
365 get_input_file (const void *handle
, struct ld_plugin_input_file
*file
)
367 ASSERT (called_plugin
);
373 /* Release the input file. */
374 static enum ld_plugin_status
375 release_input_file (const void *handle
)
377 ASSERT (called_plugin
);
382 /* Get the symbol resolution info for a plugin-claimed input file. */
383 static enum ld_plugin_status
384 get_symbols (const void *handle
, int nsyms
, struct ld_plugin_symbol
*syms
)
386 const bfd
*abfd
= handle
;
388 ASSERT (called_plugin
);
389 for (n
= 0; n
< nsyms
; n
++)
391 struct bfd_link_hash_entry
*blhe
;
394 blhe
= bfd_link_hash_lookup (link_info
.hash
, syms
[n
].name
,
398 syms
[n
].resolution
= LDPR_UNKNOWN
;
402 /* Determine resolution from blhe type and symbol's original type. */
403 if (blhe
->type
== bfd_link_hash_undefined
404 || blhe
->type
== bfd_link_hash_undefweak
)
406 syms
[n
].resolution
= LDPR_UNDEF
;
409 if (blhe
->type
!= bfd_link_hash_defined
410 && blhe
->type
!= bfd_link_hash_defweak
411 && blhe
->type
!= bfd_link_hash_common
)
413 /* We should not have a new, indirect or warning symbol here. */
414 einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)",
415 called_plugin
->name
, blhe
->type
);
418 /* We need to know if the sym is referenced from non-IR files. */
419 ironly
= !bfd_hash_lookup (non_ironly_hash
, syms
[n
].name
, FALSE
, FALSE
);
421 /* If it was originally undefined or common, then it has been
422 resolved; determine how. */
423 if (syms
[n
].def
== LDPK_UNDEF
|| syms
[n
].def
== LDPK_WEAKUNDEF
424 || syms
[n
].def
== LDPK_COMMON
)
426 asection
*owner_sec
= (blhe
->type
== bfd_link_hash_common
)
427 ? blhe
->u
.c
.p
->section
428 : blhe
->u
.def
.section
;
429 if (owner_sec
->owner
== link_info
.output_bfd
)
430 syms
[n
].resolution
= LDPR_RESOLVED_EXEC
;
431 else if (owner_sec
->owner
== abfd
)
432 syms
[n
].resolution
= (ironly
)
433 ? LDPR_PREVAILING_DEF_IRONLY
434 : LDPR_PREVAILING_DEF
;
435 else if (is_ir_dummy_bfd (owner_sec
->owner
))
436 syms
[n
].resolution
= LDPR_RESOLVED_IR
;
437 else if (owner_sec
->owner
->flags
& DYNAMIC
)
438 syms
[n
].resolution
= LDPR_RESOLVED_DYN
;
440 syms
[n
].resolution
= LDPR_RESOLVED_EXEC
;
444 /* Was originally def, or weakdef. Does it prevail? If the
445 owner is the original dummy bfd that supplied it, then this
446 is the definition that has prevailed. */
447 if (blhe
->u
.def
.section
->owner
== link_info
.output_bfd
)
448 syms
[n
].resolution
= LDPR_PREEMPTED_REG
;
449 else if (blhe
->u
.def
.section
->owner
== abfd
)
451 syms
[n
].resolution
= (ironly
)
452 ? LDPR_PREVAILING_DEF_IRONLY
453 : LDPR_PREVAILING_DEF
;
457 /* Was originally def, weakdef, or common, but has been pre-empted. */
458 syms
[n
].resolution
= is_ir_dummy_bfd (blhe
->u
.def
.section
->owner
)
460 : LDPR_PREEMPTED_REG
;
465 /* Add a new (real) input file generated by a plugin. */
466 static enum ld_plugin_status
467 add_input_file (const char *pathname
)
469 ASSERT (called_plugin
);
470 if (!lang_add_input_file (xstrdup (pathname
), lang_input_file_is_file_enum
,
476 /* Add a new (real) library required by a plugin. */
477 static enum ld_plugin_status
478 add_input_library (const char *pathname
)
480 ASSERT (called_plugin
);
481 if (!lang_add_input_file (xstrdup (pathname
), lang_input_file_is_l_enum
,
487 /* Set the extra library path to be used by libraries added via
488 add_input_library. */
489 static enum ld_plugin_status
490 set_extra_library_path (const char *path
)
492 ASSERT (called_plugin
);
493 ldfile_add_library_path (xstrdup (path
), FALSE
);
497 /* Issue a diagnostic message from a plugin. */
498 static enum ld_plugin_status
499 message (int level
, const char *format
, ...)
502 va_start (args
, format
);
507 vfinfo (stdout
, format
, args
, FALSE
);
510 vfinfo (stdout
, format
, args
, TRUE
);
516 char *newfmt
= ACONCAT ((level
== LDPL_FATAL
? "%F" : "%X",
518 vfinfo (stderr
, newfmt
, args
, TRUE
);
527 /* Helper to size leading part of tv array and set it up. */
529 set_tv_header (struct ld_plugin_tv
*tv
)
534 static const unsigned int major
= (unsigned)(BFD_VERSION
/ 100000000UL);
535 static const unsigned int minor
= (unsigned)(BFD_VERSION
/ 1000000UL) % 100;
538 return tv_header_size
;
540 for (i
= 0; i
< tv_header_size
; i
++)
542 tv
[i
].tv_tag
= tv_header_tags
[i
];
543 #define TVU(x) tv[i].tv_u.tv_ ## x
544 switch (tv
[i
].tv_tag
)
547 TVU(message
) = message
;
549 case LDPT_API_VERSION
:
550 TVU(val
) = LD_PLUGIN_API_VERSION
;
552 case LDPT_GNU_LD_VERSION
:
553 TVU(val
) = major
* 100 + minor
;
555 case LDPT_LINKER_OUTPUT
:
556 TVU(val
) = link_info
.relocatable
? LDPO_REL
557 : (link_info
.shared
? LDPO_DYN
: LDPO_EXEC
);
559 case LDPT_OUTPUT_NAME
:
560 TVU(string
) = output_filename
;
562 case LDPT_REGISTER_CLAIM_FILE_HOOK
:
563 TVU(register_claim_file
) = register_claim_file
;
565 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK
:
566 TVU(register_all_symbols_read
) = register_all_symbols_read
;
568 case LDPT_REGISTER_CLEANUP_HOOK
:
569 TVU(register_cleanup
) = register_cleanup
;
571 case LDPT_ADD_SYMBOLS
:
572 TVU(add_symbols
) = add_symbols
;
574 case LDPT_GET_INPUT_FILE
:
575 TVU(get_input_file
) = get_input_file
;
577 case LDPT_RELEASE_INPUT_FILE
:
578 TVU(release_input_file
) = release_input_file
;
580 case LDPT_GET_SYMBOLS
:
581 TVU(get_symbols
) = get_symbols
;
583 case LDPT_ADD_INPUT_FILE
:
584 TVU(add_input_file
) = add_input_file
;
586 case LDPT_ADD_INPUT_LIBRARY
:
587 TVU(add_input_library
) = add_input_library
;
589 case LDPT_SET_EXTRA_LIBRARY_PATH
:
590 TVU(set_extra_library_path
) = set_extra_library_path
;
593 /* Added a new entry to the array without adding
594 a new case to set up its value is a bug. */
599 return tv_header_size
;
602 /* Append the per-plugin args list and trailing LDPT_NULL to tv. */
604 set_tv_plugin_args (plugin_t
*plugin
, struct ld_plugin_tv
*tv
)
606 plugin_arg_t
*arg
= plugin
->args
;
609 tv
->tv_tag
= LDPT_OPTION
;
610 tv
->tv_u
.tv_string
= arg
->arg
;
614 tv
->tv_tag
= LDPT_NULL
;
618 /* Load up and initialise all plugins after argument parsing. */
619 int plugin_load_plugins (void)
621 struct ld_plugin_tv
*my_tv
;
622 unsigned int max_args
= 0;
623 plugin_t
*curplug
= plugins_list
;
625 /* If there are no plugins, we need do nothing this run. */
629 /* First pass over plugins to find max # args needed so that we
630 can size and allocate the tv array. */
633 if (curplug
->n_args
> max_args
)
634 max_args
= curplug
->n_args
;
635 curplug
= curplug
->next
;
638 /* Allocate tv array and initialise constant part. */
639 my_tv
= xmalloc ((max_args
+ 1 + tv_header_size
) * sizeof *my_tv
);
640 set_tv_header (my_tv
);
642 /* Pass over plugins again, activating them. */
643 curplug
= plugins_list
;
646 enum ld_plugin_status rv
;
647 ld_plugin_onload onloadfn
= dlsym (curplug
->dlhandle
, "onload");
649 onloadfn
= dlsym (curplug
->dlhandle
, "_onload");
651 return set_plugin_error (curplug
->name
);
652 set_tv_plugin_args (curplug
, &my_tv
[tv_header_size
]);
653 called_plugin
= curplug
;
654 rv
= (*onloadfn
) (my_tv
);
655 called_plugin
= NULL
;
657 return set_plugin_error (curplug
->name
);
658 curplug
= curplug
->next
;
661 /* Since plugin(s) inited ok, assume they're going to want symbol
662 resolutions, which needs us to track which symbols are referenced
663 by non-IR files using the linker's notice callback. */
664 link_info
.notice_all
= TRUE
;
669 /* Call 'claim file' hook for all plugins. */
671 plugin_call_claim_file (const struct ld_plugin_input_file
*file
, int *claimed
)
673 plugin_t
*curplug
= plugins_list
;
675 if (no_more_claiming
)
677 while (curplug
&& !*claimed
)
679 if (curplug
->claim_file_handler
)
681 enum ld_plugin_status rv
;
682 called_plugin
= curplug
;
683 rv
= (*curplug
->claim_file_handler
) (file
, claimed
);
684 called_plugin
= NULL
;
686 set_plugin_error (curplug
->name
);
688 curplug
= curplug
->next
;
690 return plugin_error_p () ? -1 : 0;
693 /* Call 'all symbols read' hook for all plugins. */
695 plugin_call_all_symbols_read (void)
697 plugin_t
*curplug
= plugins_list
;
699 /* Disable any further file-claiming. */
700 no_more_claiming
= TRUE
;
702 /* If --allow-multiple-definition is in effect, we need to disable it,
703 as the plugin infrastructure relies on the multiple_definition
704 callback to swap out the dummy IR-only BFDs for new real ones
705 when it starts opening the files added during this callback. */
706 plugin_cached_allow_multiple_defs
= link_info
.allow_multiple_definition
;
707 link_info
.allow_multiple_definition
= FALSE
;
711 if (curplug
->all_symbols_read_handler
)
713 enum ld_plugin_status rv
;
714 called_plugin
= curplug
;
715 rv
= (*curplug
->all_symbols_read_handler
) ();
716 called_plugin
= NULL
;
718 set_plugin_error (curplug
->name
);
720 curplug
= curplug
->next
;
722 return plugin_error_p () ? -1 : 0;
725 /* Call 'cleanup' hook for all plugins. */
727 plugin_call_cleanup (void)
729 plugin_t
*curplug
= plugins_list
;
732 if (curplug
->cleanup_handler
&& !curplug
->cleanup_done
)
734 enum ld_plugin_status rv
;
735 curplug
->cleanup_done
= TRUE
;
736 called_plugin
= curplug
;
737 rv
= (*curplug
->cleanup_handler
) ();
738 called_plugin
= NULL
;
740 set_plugin_error (curplug
->name
);
741 dlclose (curplug
->dlhandle
);
743 curplug
= curplug
->next
;
745 return plugin_error_p () ? -1 : 0;
748 /* Lazily init the non_ironly hash table. */
750 init_non_ironly_hash (void)
752 if (non_ironly_hash
== NULL
)
755 (struct bfd_hash_table
*) xmalloc (sizeof (struct bfd_hash_table
));
756 if (!bfd_hash_table_init_n (non_ironly_hash
,
758 sizeof (struct bfd_hash_entry
),
760 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
764 /* To determine which symbols should be resolved LDPR_PREVAILING_DEF
765 and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as
766 the linker adds them to the linker hash table. If we see a symbol
767 being referenced from a non-IR file, we add it to the non_ironly hash
768 table. If we can't find it there at get_symbols time, we know that
769 it was referenced only by IR files. We have to notice_all symbols,
770 because we won't necessarily know until later which ones will be
771 contributed by IR files. */
773 plugin_notice (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
774 const char *name
, bfd
*abfd
,
775 asection
*section
, bfd_vma value ATTRIBUTE_UNUSED
)
777 bfd_boolean is_ref
= bfd_is_und_section (section
);
778 bfd_boolean is_dummy
= is_ir_dummy_bfd (abfd
);
779 init_non_ironly_hash ();
780 /* We only care about refs, not defs, indicated by section pointing
781 to the undefined section (according to the bfd linker notice callback
782 interface definition). */
783 if (is_ref
&& !is_dummy
)
785 /* This is a ref from a non-IR file, so note the ref'd symbol
786 in the non-IR-only hash. */
787 if (!bfd_hash_lookup (non_ironly_hash
, name
, TRUE
, TRUE
))
788 einfo (_("%P%X: %s: hash table failure adding symbol %s"),
789 abfd
->filename
, name
);
791 else if (!is_ref
&& is_dummy
)
793 /* No further processing since this is a def from an IR dummy BFD. */
797 /* Continue with cref/nocrossref/trace-sym processing. */
801 /* When we add new object files to the link at all symbols read time,
802 these contain the real code and symbols generated from the IR files,
803 and so duplicate all the definitions already supplied by the dummy
804 IR-only BFDs that we created at claim files time. We use the linker's
805 multiple-definitions callback hook to fix up the clash, discarding
806 the symbol from the IR-only BFD in favour of the symbol from the
807 real BFD. We return true if this was not-really-a-clash because
808 we've fixed it up, or anyway if --allow-multiple-definition was in
809 effect (before we disabled it to ensure we got called back). */
811 plugin_multiple_definition (struct bfd_link_info
*info
, const char *name
,
812 bfd
*obfd
, asection
*osec ATTRIBUTE_UNUSED
,
813 bfd_vma oval ATTRIBUTE_UNUSED
,
814 bfd
*nbfd
, asection
*nsec
, bfd_vma nval
)
816 if (is_ir_dummy_bfd (obfd
))
818 struct bfd_link_hash_entry
*blhe
= bfd_link_hash_lookup (info
->hash
,
819 name
, FALSE
, FALSE
, FALSE
);
821 einfo (_("%P%X: %s: can't find IR symbol '%s'"), nbfd
->filename
,
823 else if (blhe
->type
!= bfd_link_hash_defined
)
824 einfo (_("%P%x: %s: bad IR symbol type %d"), name
, blhe
->type
);
825 /* Replace it with new details. */
826 blhe
->u
.def
.section
= nsec
;
827 blhe
->u
.def
.value
= nval
;
830 return plugin_cached_allow_multiple_defs
;