263 lines
8.1 KiB
Plaintext
263 lines
8.1 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
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#
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# This file is part of GLD, the Gnu Linker.
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#
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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 2 of the License, or
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# (at your option) any later version.
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#
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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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#
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# This file is sourced from elf32.em and mmo.em, used to define
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# linker MMIX-specifics common to ELF and MMO.
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cat >>e${EMULATION_NAME}.c <<EOF
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/* Need to have this define before mmix-elfnmmo, which includes
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needrelax.em which uses this name for the before_allocation function,
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normally defined in elf32.em. */
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#define gldmmo_before_allocation before_allocation_default
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EOF
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. ${srcdir}/emultempl/mmix-elfnmmo.em
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cat >>e${EMULATION_NAME}.c <<EOF
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/* Find the last output section before given output statement.
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Used by place_orphan. */
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static asection *
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output_prev_sec_find (lang_output_section_statement_type *os)
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{
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asection *s = NULL;
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lang_statement_union_type *u;
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lang_output_section_statement_type *lookup;
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for (u = lang_output_section_statement.head;
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u != (lang_statement_union_type *) NULL;
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u = lookup->next)
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{
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lookup = &u->output_section_statement;
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if (lookup == os)
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break;
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if (lookup->bfd_section != NULL
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&& lookup->bfd_section != bfd_abs_section_ptr
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&& lookup->bfd_section != bfd_com_section_ptr
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&& lookup->bfd_section != bfd_und_section_ptr)
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s = lookup->bfd_section;
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}
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if (u == NULL)
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return NULL;
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return s;
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}
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struct orphan_save {
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lang_output_section_statement_type *os;
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asection **section;
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lang_statement_union_type **stmt;
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};
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#define HAVE_SECTION(hold, name) \
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(hold.os != NULL || (hold.os = lang_output_section_find (name)) != NULL)
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/* Place an orphan section. We use this to put random SEC_CODE or
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SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed
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from elf32.em. */
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static bfd_boolean
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mmo_place_orphan (lang_input_statement_type *file, asection *s)
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{
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static struct orphan_save hold_text;
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struct orphan_save *place;
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lang_output_section_statement_type *os;
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lang_statement_list_type *old;
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lang_statement_list_type add;
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asection *snew, **pps, *bfd_section;
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/* We have nothing to say for anything other than a final link. */
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if (link_info.relocatable
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|| (bfd_get_section_flags (s->owner, s)
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& (SEC_EXCLUDE | SEC_LOAD)) != SEC_LOAD)
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return FALSE;
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/* Only care for sections we're going to load. */
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os = lang_output_section_find (bfd_get_section_name (s->owner, s));
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/* We have an output section by this name. Place the section inside it
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(regardless of whether the linker script lists it as input). */
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if (os != NULL)
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{
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lang_add_section (&os->children, s, os, file);
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return TRUE;
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}
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/* If this section does not have .text-type section flags or there's no
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MMO_TEXT_SECTION_NAME, we don't have anything to say. */
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if ((bfd_get_section_flags (s->owner, s) & (SEC_CODE | SEC_READONLY)) == 0)
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return FALSE;
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if (hold_text.os == NULL)
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hold_text.os = lang_output_section_find (MMO_TEXT_SECTION_NAME);
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place = &hold_text;
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/* If there's an output section by this name, we'll use it, regardless
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of section flags, in contrast to what's done in elf32.em. */
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/* Start building a list of statements for this section.
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First save the current statement pointer. */
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old = stat_ptr;
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/* Add the output section statements for this orphan to our own private
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list, inserting them later into the global statement list. */
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stat_ptr = &add;
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lang_list_init (stat_ptr);
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os = lang_enter_output_section_statement (bfd_get_section_name (s->owner,
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s),
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NULL, 0,
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(bfd_vma) 0,
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(etree_type *) NULL,
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(etree_type *) NULL,
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(etree_type *) NULL);
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lang_add_section (&os->children, s, os, file);
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lang_leave_output_section_statement
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((bfd_vma) 0, "*default*",
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(struct lang_output_section_phdr_list *) NULL, NULL);
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/* Restore the global list pointer. */
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stat_ptr = old;
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snew = os->bfd_section;
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if (snew == NULL)
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/* /DISCARD/ section. */
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return TRUE;
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/* We need an output section for .text as a root, so if there was none
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(might happen with a peculiar linker script such as in "map
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addresses", map-address.exp), we grab the output section created
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above. */
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if (hold_text.os == NULL)
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{
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if (os == NULL)
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return FALSE;
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hold_text.os = os;
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}
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bfd_section = place->os->bfd_section;
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if (place->section == NULL && bfd_section == NULL)
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bfd_section = output_prev_sec_find (place->os);
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if (place->section != NULL
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|| (bfd_section != NULL
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&& bfd_section != snew))
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{
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/* Shuffle the section to make the output file look neater. This is
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really only cosmetic. */
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if (place->section == NULL)
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/* Put orphans after the first section on the list. */
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place->section = &bfd_section->next;
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/* Unlink the section. */
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for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
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;
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bfd_section_list_remove (output_bfd, pps);
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/* Now tack it on to the "place->os" section list. */
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bfd_section_list_insert (output_bfd, place->section, snew);
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}
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place->section = &snew->next; /* Save the end of this list. */
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if (add.head != NULL)
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{
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/* We try to put the output statements in some sort of reasonable
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order here, because they determine the final load addresses of
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the orphan sections. */
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if (place->stmt == NULL)
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{
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/* Put the new statement list right at the head. */
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*add.tail = place->os->header.next;
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place->os->header.next = add.head;
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}
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else
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{
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/* Put it after the last orphan statement we added. */
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*add.tail = *place->stmt;
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*place->stmt = add.head;
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}
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/* Fix the global list pointer if we happened to tack our new list
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at the tail. */
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if (*old->tail == add.head)
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old->tail = add.tail;
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/* Save the end of this list. */
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place->stmt = add.tail;
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}
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return TRUE;
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}
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/* Remove the spurious settings of SEC_RELOC that make it to the output at
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link time. We are as confused as elflink.h:elf_bfd_final_link, and
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paper over the bug similarly. */
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static void
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mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED)
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{
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bfd_set_section_flags (abfd, sec,
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bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
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}
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/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
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static void
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mmo_finish (void)
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{
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bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL);
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}
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/* To get on-demand global register allocation right, we need to parse the
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relocs, like what happens when linking to ELF. It needs to be done
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before all input sections are supposed to be present. When linking to
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ELF, it's done when reading symbols. When linking to mmo, we do it
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when all input files are seen, which is equivalent. */
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static void
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mmo_after_open (void)
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{
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/* When there's a mismatch between the output format and the emulation
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(using weird combinations like "-m mmo --oformat elf64-mmix" for
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example), we'd count relocs twice because they'd also be counted
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along the usual route for ELF-only linking, which would lead to an
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internal accounting error. */
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if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
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{
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
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&& !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
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einfo ("%X%P: Internal problems scanning %B after opening it",
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is->the_bfd);
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}
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}
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}
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EOF
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LDEMUL_PLACE_ORPHAN=mmo_place_orphan
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LDEMUL_FINISH=mmo_finish
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LDEMUL_AFTER_OPEN=mmo_after_open
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