1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
# This shell script emits a C file. -*- C -*-
# Copyright 2001, 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
#
# This file is part of GLD, the Gnu Linker.
#
# 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 2 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.
#
# This file is sourced from generic.em.
cat >>e${EMULATION_NAME}.c <<EOF
/* Need to have this macro defined before mmix-elfnmmo, which uses the
name for the before_allocation function, defined in ldemul.c (for
the mmo "emulation") or in elf32.em (for the elf64mmix
"emulation"). */
#define gldmmo_before_allocation before_allocation_default
/* We include this header *not* because we expect to handle ELF here
but because we re-use the map_segments function in elf-generic.em,
a file which is rightly somewhat ELF-centric. But this is only to
get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be
output from the mmo emulation: -m mmo --oformat elf64-mmix! */
#include "elf-bfd.h"
EOF
. ${srcdir}/emultempl/elf-generic.em
. ${srcdir}/emultempl/mmix-elfnmmo.em
cat >>e${EMULATION_NAME}.c <<EOF
/* Place an orphan section. We use this to put random SEC_CODE or
SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed
from elf32.em. */
static bfd_boolean
mmo_place_orphan (asection *s)
{
static struct orphan_save hold_text =
{
MMO_TEXT_SECTION_NAME,
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
0, 0, 0, 0
};
struct orphan_save *place;
const char *secname;
lang_output_section_statement_type *after;
lang_output_section_statement_type *os;
/* We have nothing to say for anything other than a final link. */
if (link_info.relocatable
|| (s->flags & (SEC_EXCLUDE | SEC_LOAD)) != SEC_LOAD)
return FALSE;
/* Only care for sections we're going to load. */
secname = s->name;
os = lang_output_section_find (secname);
/* We have an output section by this name. Place the section inside it
(regardless of whether the linker script lists it as input). */
if (os != NULL)
{
lang_add_section (&os->children, s, os);
return TRUE;
}
/* If this section does not have .text-type section flags or there's no
MMO_TEXT_SECTION_NAME, we don't have anything to say. */
if ((s->flags & (SEC_CODE | SEC_READONLY)) == 0)
return FALSE;
if (hold_text.os == NULL)
hold_text.os = lang_output_section_find (hold_text.name);
place = &hold_text;
if (hold_text.os != NULL)
after = hold_text.os;
else
after = &lang_output_section_statement.head->output_section_statement;
/* If there's an output section by this name, we'll use it, regardless
of section flags, in contrast to what's done in elf32.em. */
os = lang_insert_orphan (s, secname, after, place, NULL, NULL);
/* We need an output section for .text as a root, so if there was none
(might happen with a peculiar linker script such as in "map
addresses", map-address.exp), we grab the output section created
above. */
if (hold_text.os == NULL)
hold_text.os = os;
return TRUE;
}
/* Remove the spurious settings of SEC_RELOC that make it to the output at
link time. We are as confused as elflink.h:elf_bfd_final_link, and
paper over the bug similarly. */
static void
mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED)
{
bfd_set_section_flags (abfd, sec,
bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
}
/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
static void
mmo_finish (void)
{
bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL);
gld${EMULATION_NAME}_map_segments (FALSE);
finish_default ();
}
/* To get on-demand global register allocation right, we need to parse the
relocs, like what happens when linking to ELF. It needs to be done
before all input sections are supposed to be present. When linking to
ELF, it's done when reading symbols. When linking to mmo, we do it
when all input files are seen, which is equivalent. */
static void
mmo_after_open (void)
{
/* When there's a mismatch between the output format and the emulation
(using weird combinations like "-m mmo --oformat elf64-mmix" for
example), we'd count relocs twice because they'd also be counted
along the usual route for ELF-only linking, which would lead to an
internal accounting error. */
if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
{
LANG_FOR_EACH_INPUT_STATEMENT (is)
{
if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
&& !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
einfo ("%X%P: Internal problems scanning %B after opening it",
is->the_bfd);
}
}
}
EOF
LDEMUL_PLACE_ORPHAN=mmo_place_orphan
LDEMUL_FINISH=mmo_finish
LDEMUL_AFTER_OPEN=mmo_after_open
|
