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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
# This shell script emits a C file. -*- C -*-
# Copyright (C) 2001-2019 Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# 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 3 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.
fragment <<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 elf.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 use the map_segments function. 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 "ldelfgen.h"
static void gld${EMULATION_NAME}_after_allocation (void);
EOF
source_em ${srcdir}/emultempl/elf-generic.em
source_em ${srcdir}/emultempl/mmix-elfnmmo.em
fragment <<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 elf.em. */
static lang_output_section_statement_type *
mmo_place_orphan (asection *s,
const char *secname,
int constraint ATTRIBUTE_UNUSED)
{
static struct
{
flagword nonzero_flags;
struct orphan_save orphansave;
} holds[] =
{
{
SEC_CODE | SEC_READONLY,
{
MMO_TEXT_SECTION_NAME,
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
0, 0, 0, 0
}
},
{
SEC_LOAD | SEC_DATA,
{
MMO_DATA_SECTION_NAME,
SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA,
0, 0, 0, 0
}
},
{
SEC_ALLOC,
{
".bss",
SEC_ALLOC,
0, 0, 0, 0
}
}
};
struct orphan_save *place = NULL;
lang_output_section_statement_type *after;
lang_output_section_statement_type *os;
size_t i;
flagword flags;
asection *nexts;
/* We have nothing to say for anything other than a final link or
for sections that are excluded. */
if (bfd_link_relocatable (&link_info)
|| (s->flags & SEC_EXCLUDE) != 0)
return NULL;
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, NULL, os);
return os;
}
flags = s->flags;
if (!bfd_link_relocatable (&link_info))
{
nexts = s;
while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts))
!= NULL)
if (nexts->output_section == NULL
&& (nexts->flags & SEC_EXCLUDE) == 0
&& ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0
&& (nexts->owner->flags & DYNAMIC) == 0
&& !bfd_input_just_syms (nexts->owner))
flags = (((flags ^ SEC_READONLY) | (nexts->flags ^ SEC_READONLY))
^ SEC_READONLY);
}
/* Check for matching section type flags for sections we care about.
A section without contents can have SEC_LOAD == 0, but we still
want it attached to a sane section so the symbols appear as
expected. */
if ((flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY)
for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++)
if ((flags & holds[i].nonzero_flags) != 0)
{
place = &holds[i].orphansave;
if (place->os == NULL)
place->os = lang_output_section_find (place->name);
break;
}
if (place == NULL)
{
/* For other combinations, we have to give up, except we make
sure not to place the orphan section after the
linker-generated register section; that'd make it continue
the reg section and we never want that to happen for orphan
sections. */
lang_output_section_statement_type *before;
lang_output_section_statement_type *lookup;
static struct orphan_save hold_nonreg =
{
NULL,
SEC_READONLY,
0, 0, 0, 0
};
if (hold_nonreg.os == NULL)
{
before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME);
/* If we have no such section, all fine; we don't care where
it's placed. */
if (before == NULL)
return NULL;
/* We have to find the oss before this one, so we can use that as
"after". */
for (lookup = &lang_os_list.head->output_section_statement;
lookup != NULL && lookup->next != before;
lookup = lookup->next)
;
hold_nonreg.os = lookup;
}
place = &hold_nonreg;
}
after = place->os;
if (after == NULL)
return NULL;
/* If there's an output section by *this* name, we'll use it, regardless
of actual section flags, in contrast to what's done in elf.em. */
os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL);
return os;
}
/* 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 ATTRIBUTE_UNUSED, asection *sec,
void *ptr ATTRIBUTE_UNUSED)
{
bfd_set_section_flags (sec, bfd_section_flags (sec) & ~SEC_RELOC);
}
/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
static void
gld${EMULATION_NAME}_after_allocation (void)
{
bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL);
ldelf_map_segments (FALSE);
}
/* 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 (link_info.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 %pB after opening it"),
is->the_bfd);
}
}
after_open_default ();
}
EOF
LDEMUL_PLACE_ORPHAN=mmo_place_orphan
LDEMUL_AFTER_OPEN=mmo_after_open
|
