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
238
239
240
|
# This shell script emits a C file. -*- C -*-
# It does some substitutions.
cat >e${EMULATION_NAME}.c <<EOF
/* This file is is generated by a shell script. DO NOT EDIT! */
/* Handle embedded relocs for m68k.
Copyright 2000, 2002, 2003 Free Software Foundation, Inc.
Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on generic.em
by Steve Chamberlain <steve@cygnus.com>, embedded relocs code based on
mipsecoff.em by Ian Lance Taylor <ian@cygnus.com>.
This file is part of GLD, the Gnu Linker.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#define TARGET_IS_${EMULATION_NAME}
#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "ld.h"
#include "ldmain.h"
#include "ldfile.h"
#include "ldemul.h"
#include "ldmisc.h"
static void check_sections (bfd *, asection *, void *);
static void
gld${EMULATION_NAME}_before_parse (void)
{
#ifndef TARGET_ /* I.e., if not generic. */
ldfile_set_output_arch ("`echo ${ARCH}`");
#endif /* not TARGET_ */
}
/* This function is run after all the input files have been opened.
We create a .emreloc section for each input file with a non zero
.data section. The BFD backend will fill in these sections with
magic numbers which can be used to relocate the data section at run
time. */
static void
gld${EMULATION_NAME}_after_open (void)
{
bfd *abfd;
if (! command_line.embedded_relocs
|| link_info.relocatable)
return;
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
{
asection *datasec;
/* As first-order business, make sure that each input BFD is COFF. It
better be, as we are directly calling a COFF backend function. */
if (bfd_get_flavour (abfd) != bfd_target_coff_flavour)
einfo ("%F%B: all input objects must be COFF for --embedded-relocs\n");
datasec = bfd_get_section_by_name (abfd, ".data");
/* Note that we assume that the reloc_count field has already
been set up. We could call bfd_get_reloc_upper_bound, but
that returns the size of a memory buffer rather than a reloc
count. We do not want to call bfd_canonicalize_reloc,
because although it would always work it would force us to
read in the relocs into BFD canonical form, which would waste
a significant amount of time and memory. */
if (datasec != NULL && datasec->reloc_count > 0)
{
asection *relsec;
relsec = bfd_make_section (abfd, ".emreloc");
if (relsec == NULL
|| ! bfd_set_section_flags (abfd, relsec,
(SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY))
|| ! bfd_set_section_alignment (abfd, relsec, 2)
|| ! bfd_set_section_size (abfd, relsec,
datasec->reloc_count * 12))
einfo ("%F%B: can not create .emreloc section: %E\n");
}
/* Double check that all other data sections are empty, as is
required for embedded PIC code. */
bfd_map_over_sections (abfd, check_sections, (PTR) datasec);
}
}
/* Check that of the data sections, only the .data section has
relocs. This is called via bfd_map_over_sections. */
static void
check_sections (bfd *abfd, asection *sec, void *datasec)
{
if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
&& sec != datasec
&& sec->reloc_count != 0)
einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
abfd, bfd_get_section_name (abfd, sec));
}
/* This function is called after the section sizes and offsets have
been set. If we are generating embedded relocs, it calls a special
BFD backend routine to do the work. */
static void
gld${EMULATION_NAME}_after_allocation (void)
{
bfd *abfd;
if (! command_line.embedded_relocs
|| link_info.relocatable)
return;
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
{
asection *datasec, *relsec;
char *errmsg;
datasec = bfd_get_section_by_name (abfd, ".data");
if (datasec == NULL || datasec->reloc_count == 0)
continue;
relsec = bfd_get_section_by_name (abfd, ".emreloc");
ASSERT (relsec != NULL);
if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info,
datasec, relsec,
&errmsg))
{
if (errmsg == NULL)
einfo ("%B%X: can not create runtime reloc information: %E\n",
abfd);
else
einfo ("%X%B: can not create runtime reloc information: %s\n",
abfd, errmsg);
}
}
}
static char *
gld${EMULATION_NAME}_get_script (int *isfile)
EOF
if test -n "$COMPILE_IN"
then
# Scripts compiled in.
# sed commands to quote an ld script as a C string.
sc="-f stringify.sed"
cat >>e${EMULATION_NAME}.c <<EOF
{
*isfile = 0;
if (link_info.relocatable && config.build_constructors)
return
EOF
sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
echo ' ; else if (link_info.relocatable) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c
echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c
echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
echo ' ; else return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c
echo '; }' >> e${EMULATION_NAME}.c
else
# Scripts read from the filesystem.
cat >>e${EMULATION_NAME}.c <<EOF
{
*isfile = 1;
if (link_info.relocatable && config.build_constructors)
return "ldscripts/${EMULATION_NAME}.xu";
else if (link_info.relocatable)
return "ldscripts/${EMULATION_NAME}.xr";
else if (!config.text_read_only)
return "ldscripts/${EMULATION_NAME}.xbn";
else if (!config.magic_demand_paged)
return "ldscripts/${EMULATION_NAME}.xn";
else
return "ldscripts/${EMULATION_NAME}.x";
}
EOF
fi
cat >>e${EMULATION_NAME}.c <<EOF
struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
{
gld${EMULATION_NAME}_before_parse,
syslib_default,
hll_default,
after_parse_default,
gld${EMULATION_NAME}_after_open,
gld${EMULATION_NAME}_after_allocation,
set_output_arch_default,
ldemul_default_target,
before_allocation_default,
gld${EMULATION_NAME}_get_script,
"${EMULATION_NAME}",
"${OUTPUT_FORMAT}",
NULL, /* finish */
NULL, /* create output section statements */
NULL, /* open dynamic archive */
NULL, /* place orphan */
NULL, /* set symbols */
NULL, /* parse args */
NULL, /* add_options */
NULL, /* handle_option */
NULL, /* unrecognized file */
NULL, /* list options */
NULL, /* recognized file */
NULL, /* find_potential_libraries */
NULL /* new_vers_pattern */
};
EOF
|
