1# This shell script emits a C file. -*- C -*-
2#   Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
3#
4# This file is part of GLD, the Gnu Linker.
5#
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 2 of the License, or
9# (at your option) any later version.
10#
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.
15#
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, MA 02110-1301, USA.
19#
20
21# This file is sourced from elf32.em and mmo.em, used to define
22# linker MMIX-specifics common to ELF and MMO.
23
24cat >>e${EMULATION_NAME}.c <<EOF
25/* Need to have this define before mmix-elfnmmo, which includes
26   needrelax.em which uses this name for the before_allocation function,
27   normally defined in elf32.em.  */
28#define gldmmo_before_allocation before_allocation_default
29EOF
30
31. ${srcdir}/emultempl/mmix-elfnmmo.em
32
33cat >>e${EMULATION_NAME}.c <<EOF
34
35/* Place an orphan section.  We use this to put random SEC_CODE or
36   SEC_READONLY sections right after MMO_TEXT_SECTION_NAME.  Much borrowed
37   from elf32.em.  */
38
39static bfd_boolean
40mmo_place_orphan (asection *s)
41{
42  static struct orphan_save hold_text =
43    {
44      MMO_TEXT_SECTION_NAME,
45      SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
46      0, 0, 0, 0
47    };
48  struct orphan_save *place;
49  const char *secname;
50  lang_output_section_statement_type *after;
51  lang_output_section_statement_type *os;
52
53  /* We have nothing to say for anything other than a final link.  */
54  if (link_info.relocatable
55      || (s->flags & (SEC_EXCLUDE | SEC_LOAD)) != SEC_LOAD)
56    return FALSE;
57
58  /* Only care for sections we're going to load.  */
59  secname = s->name;
60  os = lang_output_section_find (secname);
61
62  /* We have an output section by this name.  Place the section inside it
63     (regardless of whether the linker script lists it as input).  */
64  if (os != NULL)
65    {
66      lang_add_section (&os->children, s, os);
67      return TRUE;
68    }
69
70  /* If this section does not have .text-type section flags or there's no
71     MMO_TEXT_SECTION_NAME, we don't have anything to say.  */
72  if ((s->flags & (SEC_CODE | SEC_READONLY)) == 0)
73    return FALSE;
74
75  if (hold_text.os == NULL)
76    hold_text.os = lang_output_section_find (hold_text.name);
77
78  place = &hold_text;
79  if (hold_text.os != NULL)
80    after = hold_text.os;
81  else
82    after = &lang_output_section_statement.head->output_section_statement;
83
84  /* If there's an output section by this name, we'll use it, regardless
85     of section flags, in contrast to what's done in elf32.em.  */
86  os = lang_insert_orphan (s, secname, after, place, NULL, NULL);
87
88  /* We need an output section for .text as a root, so if there was none
89     (might happen with a peculiar linker script such as in "map
90     addresses", map-address.exp), we grab the output section created
91     above.  */
92  if (hold_text.os == NULL)
93    hold_text.os = os;
94
95  return TRUE;
96}
97
98/* Remove the spurious settings of SEC_RELOC that make it to the output at
99   link time.  We are as confused as elflink.h:elf_bfd_final_link, and
100   paper over the bug similarly.  */
101
102static void
103mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED)
104{
105  bfd_set_section_flags (abfd, sec,
106			 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
107}
108
109/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
110
111static void
112mmo_finish (void)
113{
114  bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL);
115  finish_default ();
116}
117
118/* To get on-demand global register allocation right, we need to parse the
119   relocs, like what happens when linking to ELF.  It needs to be done
120   before all input sections are supposed to be present.  When linking to
121   ELF, it's done when reading symbols.  When linking to mmo, we do it
122   when all input files are seen, which is equivalent.  */
123
124static void
125mmo_after_open (void)
126{
127  /* When there's a mismatch between the output format and the emulation
128     (using weird combinations like "-m mmo --oformat elf64-mmix" for
129     example), we'd count relocs twice because they'd also be counted
130     along the usual route for ELF-only linking, which would lead to an
131     internal accounting error.  */
132  if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
133    {
134      LANG_FOR_EACH_INPUT_STATEMENT (is)
135	{
136	  if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
137	      && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
138	    einfo ("%X%P: Internal problems scanning %B after opening it",
139		   is->the_bfd);
140	}
141    }
142}
143EOF
144
145LDEMUL_PLACE_ORPHAN=mmo_place_orphan
146LDEMUL_FINISH=mmo_finish
147LDEMUL_AFTER_OPEN=mmo_after_open
148