/* Linker command language support.
- Copyright (C) 1991-2018 Free Software Foundation, Inc.
+ Copyright (C) 1991-2019 Free Software Foundation, Inc.
This file is part of the GNU Binutils.
static bfd_vma print_dot;
static lang_input_statement_type *first_file;
static const char *current_target;
+/* Header for list of statements corresponding to any files involved in the
+ link, either specified from the command-line or added implicitely (eg.
+ archive member used to resolved undefined symbol, wildcard statement from
+ linker script, etc.). Next pointer is in next field of a
+ lang_statement_header_type (reached via header field in a
+ lang_statement_union). */
static lang_statement_list_type statement_list;
static lang_statement_list_type *stat_save[10];
static lang_statement_list_type **stat_save_ptr = &stat_save[0];
lang_output_section_statement_type *abs_output_section;
lang_statement_list_type lang_output_section_statement;
lang_statement_list_type *stat_ptr = &statement_list;
+/* Header for list of statements corresponding to files used in the final
+ executable. This can be either object file specified on the command-line
+ or library member resolving an undefined reference. Next pointer is in next
+ field of a lang_input_statement_type (reached via input_statement field in a
+ lang_statement_union). */
lang_statement_list_type file_chain = { NULL, NULL };
+/* Header for list of statements corresponding to files specified on the
+ command-line for linking. It thus contains real object files and archive
+ but not archive members. Next pointer is in next_real_file field of a
+ lang_input_statement_type statement (reached via input_statement field in a
+ lang_statement_union). */
lang_statement_list_type input_file_chain;
struct bfd_sym_chain entry_symbol = { NULL, NULL };
const char *entry_section = ".text";
ass = &(*where)->assignment_statement;
if (ass->exp->type.node_class != etree_assert
&& ass->exp->assign.dst[0] == '.'
- && ass->exp->assign.dst[1] == 0
- && !ignore_first)
- assign = where;
+ && ass->exp->assign.dst[1] == 0)
+ {
+ if (!ignore_first)
+ assign = where;
+ ignore_first = FALSE;
+ }
}
- ignore_first = FALSE;
continue;
case lang_wild_statement_enum:
case lang_input_section_enum:
case lang_padding_statement_enum:
case lang_constructors_statement_enum:
assign = NULL;
+ ignore_first = FALSE;
continue;
case lang_output_section_statement_enum:
if (assign != NULL)
if (after != NULL && os->bfd_section != NULL)
{
asection *snew, *as;
+ bfd_boolean place_after = place->stmt == NULL;
+ bfd_boolean insert_after = TRUE;
snew = os->bfd_section;
/* Now tack it back on in the right place. */
bfd_section_list_append (link_info.output_bfd, snew);
}
+ else if ((bfd_get_flavour (link_info.output_bfd)
+ == bfd_target_elf_flavour)
+ && (bfd_get_flavour (s->owner)
+ == bfd_target_elf_flavour)
+ && ((elf_section_type (s) == SHT_NOTE
+ && (s->flags & SEC_LOAD) != 0)
+ || (elf_section_type (as) == SHT_NOTE
+ && (as->flags & SEC_LOAD) != 0)))
+ {
+ /* Make sure that output note sections are grouped and sorted
+ by alignments when inserting a note section or insert a
+ section after a note section, */
+ asection *sec;
+ /* A specific section after which the output note section
+ should be placed. */
+ asection *after_sec;
+ /* True if we need to insert the orphan section after a
+ specific section to maintain output note section order. */
+ bfd_boolean after_sec_note = FALSE;
+
+ static asection *first_orphan_note = NULL;
+
+ /* Group and sort output note section by alignments in
+ ascending order. */
+ after_sec = NULL;
+ if (elf_section_type (s) == SHT_NOTE
+ && (s->flags & SEC_LOAD) != 0)
+ {
+ /* Search from the beginning for the last output note
+ section with equal or larger alignments. NB: Don't
+ place orphan note section after non-note sections. */
+
+ first_orphan_note = NULL;
+ for (sec = link_info.output_bfd->sections;
+ (sec != NULL
+ && !bfd_is_abs_section (sec));
+ sec = sec->next)
+ if (sec != snew
+ && elf_section_type (sec) == SHT_NOTE
+ && (sec->flags & SEC_LOAD) != 0)
+ {
+ if (!first_orphan_note)
+ first_orphan_note = sec;
+ if (sec->alignment_power >= s->alignment_power)
+ after_sec = sec;
+ }
+ else if (first_orphan_note)
+ {
+ /* Stop if there is non-note section after the first
+ orphan note section. */
+ break;
+ }
+
+ /* If this will be the first orphan note section, it can
+ be placed at the default location. */
+ after_sec_note = first_orphan_note != NULL;
+ if (after_sec == NULL && after_sec_note)
+ {
+ /* If all output note sections have smaller
+ alignments, place the section before all
+ output orphan note sections. */
+ after_sec = first_orphan_note;
+ insert_after = FALSE;
+ }
+ }
+ else if (first_orphan_note)
+ {
+ /* Don't place non-note sections in the middle of orphan
+ note sections. */
+ after_sec_note = TRUE;
+ after_sec = as;
+ for (sec = as->next;
+ (sec != NULL
+ && !bfd_is_abs_section (sec));
+ sec = sec->next)
+ if (elf_section_type (sec) == SHT_NOTE
+ && (sec->flags & SEC_LOAD) != 0)
+ after_sec = sec;
+ }
+
+ if (after_sec_note)
+ {
+ if (after_sec)
+ {
+ /* Search forward to insert OS after AFTER_SEC output
+ statement. */
+ lang_output_section_statement_type *stmt, *next;
+ bfd_boolean found = FALSE;
+ for (stmt = after; stmt != NULL; stmt = next)
+ {
+ next = stmt->next;
+ if (insert_after)
+ {
+ if (stmt->bfd_section == after_sec)
+ {
+ place_after = TRUE;
+ found = TRUE;
+ after = stmt;
+ break;
+ }
+ }
+ else
+ {
+ /* If INSERT_AFTER is FALSE, place OS before
+ AFTER_SEC output statement. */
+ if (next && next->bfd_section == after_sec)
+ {
+ place_after = TRUE;
+ found = TRUE;
+ after = stmt;
+ break;
+ }
+ }
+ }
+
+ /* Search backward to insert OS after AFTER_SEC output
+ statement. */
+ if (!found)
+ for (stmt = after; stmt != NULL; stmt = stmt->prev)
+ {
+ if (insert_after)
+ {
+ if (stmt->bfd_section == after_sec)
+ {
+ place_after = TRUE;
+ after = stmt;
+ break;
+ }
+ }
+ else
+ {
+ /* If INSERT_AFTER is FALSE, place OS before
+ AFTER_SEC output statement. */
+ if (stmt->next->bfd_section == after_sec)
+ {
+ place_after = TRUE;
+ after = stmt;
+ break;
+ }
+ }
+ }
+ }
+
+ if (after_sec == NULL
+ || (insert_after && after_sec->next != snew)
+ || (!insert_after && after_sec->prev != snew))
+ {
+ /* Unlink the section. */
+ bfd_section_list_remove (link_info.output_bfd, snew);
+
+ /* Place SNEW after AFTER_SEC. If AFTER_SEC is NULL,
+ prepend SNEW. */
+ if (after_sec)
+ {
+ if (insert_after)
+ bfd_section_list_insert_after (link_info.output_bfd,
+ after_sec, snew);
+ else
+ bfd_section_list_insert_before (link_info.output_bfd,
+ after_sec, snew);
+ }
+ else
+ bfd_section_list_prepend (link_info.output_bfd, snew);
+ }
+ }
+ else if (as != snew && as->prev != snew)
+ {
+ /* Unlink the section. */
+ bfd_section_list_remove (link_info.output_bfd, snew);
+
+ /* Now tack it back on in the right place. */
+ bfd_section_list_insert_before (link_info.output_bfd,
+ as, snew);
+ }
+ }
else if (as != snew && as->prev != snew)
{
/* Unlink the section. */
{
lang_output_section_statement_type *newly_added_os;
- if (place->stmt == NULL)
+ /* Place OS after AFTER if AFTER_NOTE is TRUE. */
+ if (place_after)
{
lang_statement_union_type **where = insert_os_after (after);
|| file->flags.just_syms)
continue;
- for (s = file->the_bfd->sections; s != NULL; s = s->next)
- if ((s->output_section == NULL
- || s->output_section->owner != link_info.output_bfd)
- && (s->flags & (SEC_LINKER_CREATED | SEC_KEEP)) == 0)
- {
- if (!dis_header_printed)
- {
- fprintf (config.map_file, _("\nDiscarded input sections\n\n"));
- dis_header_printed = TRUE;
- }
+ if (config.print_map_discarded)
+ for (s = file->the_bfd->sections; s != NULL; s = s->next)
+ if ((s->output_section == NULL
+ || s->output_section->owner != link_info.output_bfd)
+ && (s->flags & (SEC_LINKER_CREATED | SEC_KEEP)) == 0)
+ {
+ if (! dis_header_printed)
+ {
+ fprintf (config.map_file, _("\nDiscarded input sections\n\n"));
+ dis_header_printed = TRUE;
+ }
- print_input_section (s, TRUE);
- }
+ print_input_section (s, TRUE);
+ }
}
minfo (_("\nMemory Configuration\n\n"));
obstack_begin (&map_obstack, 1000);
bfd_link_hash_traverse (link_info.hash, sort_def_symbol, 0);
}
+ expld.phase = lang_fixed_phase_enum;
lang_statement_iteration++;
print_statements ();
if (entry->flags.missing_file)
return TRUE;
+ if (trace_files || verbose)
+ info_msg ("%pI\n", entry);
+
if (!bfd_check_format (entry->the_bfd, bfd_archive)
&& !bfd_check_format_matches (entry->the_bfd, bfd_object, &matching))
{
case bfd_object:
if (!entry->flags.reload)
ldlang_add_file (entry);
- if (trace_files || verbose)
- info_msg ("%pI\n", entry);
break;
case bfd_archive:
case lang_wild_statement_enum:
for (sec = s->wild_statement.section_list; sec != NULL;
sec = sec->next)
- {
+ /* Don't sort .init/.fini sections. */
+ if (strcmp (sec->spec.name, ".init") != 0
+ && strcmp (sec->spec.name, ".fini") != 0)
switch (sec->spec.sorted)
{
case none:
default:
break;
}
- }
break;
case lang_constructors_statement_enum:
break;
case lang_output_section_statement_enum:
- /* Don't sort .init/.fini sections. */
- if (strcmp (s->output_section_statement.name, ".init") != 0
- && strcmp (s->output_section_statement.name, ".fini") != 0)
- update_wild_statements
- (s->output_section_statement.children.head);
+ update_wild_statements
+ (s->output_section_statement.children.head);
break;
case lang_group_statement_enum:
const char *dst = assignment->exp->assign.dst;
is_dot = (dst[0] == '.' && dst[1] == 0);
- if (!is_dot)
- expld.assign_name = dst;
- tree = assignment->exp->assign.src;
+ tree = assignment->exp;
}
osec = output_section->bfd_section;
h = bfd_link_hash_lookup (link_info.hash, assignment->exp->assign.dst,
FALSE, FALSE, TRUE);
- if (h)
+ if (h != NULL
+ && (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_defweak))
{
value = h->u.def.value;
value += h->u.def.section->output_section->vma;
break;
case lang_object_symbols_statement_enum:
- link_info.create_object_symbols_section =
- output_section_statement->bfd_section;
+ link_info.create_object_symbols_section
+ = output_section_statement->bfd_section;
+ output_section_statement->bfd_section->flags |= SEC_KEEP;
break;
case lang_output_statement_enum:
warn = TRUE;
/* Force the user to specify a root when generating a relocatable with
- --gc-sections. */
- if (link_info.gc_sections && bfd_link_relocatable (&link_info)
+ --gc-sections, unless --gc-keep-exported was also given. */
+ if (bfd_link_relocatable (&link_info)
+ && link_info.gc_sections
+ && !link_info.gc_keep_exported
&& !(entry_from_cmdline || undef_from_cmdline))
einfo (_("%F%P: gc-sections requires either an entry or "
"an undefined symbol\n"));
current_target = default_target;
lang_statement_iteration++;
open_input_bfds (statement_list.head, OPEN_BFD_NORMAL);
+ /* open_input_bfds also handles assignments, so we can give values
+ to symbolic origin/length now. */
+ lang_do_memory_regions ();
#ifdef ENABLE_PLUGINS
if (link_info.lto_plugin_active)
/* PR 13683: We must rerun the assignments prior to running garbage
collection in order to make sure that all symbol aliases are resolved. */
lang_do_assignments (lang_mark_phase_enum);
-
- lang_do_memory_regions();
expld.phase = lang_first_phase_enum;
/* Size up the common data. */
/* Fix any __start, __stop, .startof. or .sizeof. symbols. */
lang_finalize_start_stop ();
- /* Do all the assignments, now that we know the final resting places
- of all the symbols. */
+ /* Do all the assignments again, to report errors. Assignment
+ statements are processed multiple times, updating symbols; In
+ open_input_bfds, lang_do_assignments, and lang_size_sections.
+ Since lang_relax_sections calls lang_do_assignments, symbols are
+ also updated in ldemul_after_allocation. */
lang_do_assignments (lang_final_phase_enum);
ldemul_finish ();
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