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f9e6bfa8 | 1 | # This shell script emits a C file. -*- C -*- |
b90efa5b | 2 | # Copyright (C) 2003-2015 Free Software Foundation, Inc. |
f9e6bfa8 | 3 | # |
f96b4a7b | 4 | # This file is part of the GNU Binutils. |
f9e6bfa8 AM |
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 | |
f96b4a7b | 8 | # the Free Software Foundation; either version 3 of the License, or |
f9e6bfa8 AM |
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 | |
f96b4a7b NC |
18 | # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
19 | # MA 02110-1301, USA. | |
f9e6bfa8 AM |
20 | # |
21 | ||
c9a2f333 | 22 | # This file is sourced from elf32.em, and defines extra powerpc32-elf |
f9e6bfa8 AM |
23 | # specific routines. |
24 | # | |
92b93329 | 25 | fragment <<EOF |
f9e6bfa8 AM |
26 | |
27 | #include "libbfd.h" | |
28 | #include "elf32-ppc.h" | |
f05eb3b7 | 29 | #include "ldlex.h" |
b4ab4364 | 30 | #include "ldlang.h" |
f9e6bfa8 | 31 | |
5503fea1 AM |
32 | #define is_ppc_elf(bfd) \ |
33 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
4dfe6ac6 | 34 | && elf_object_id (bfd) == PPC32_ELF_DATA) |
c9a2f333 | 35 | |
f9e6bfa8 AM |
36 | /* Whether to run tls optimization. */ |
37 | static int notlsopt = 0; | |
38 | ||
5446cbdf | 39 | /* Choose the correct place for .got. */ |
0cf7d72c AM |
40 | static int old_got = 0; |
41 | ||
795bc6b3 AM |
42 | static bfd_vma pagesize = 0; |
43 | ||
d3e454b9 | 44 | static struct ppc_elf_params params = { PLT_UNSET, -1, 0, 0, 0, 0, 0 }; |
5446cbdf AM |
45 | |
46 | static void | |
47 | ppc_after_open_output (void) | |
48 | { | |
49 | if (params.emit_stub_syms < 0) | |
50 | params.emit_stub_syms = link_info.emitrelocations || link_info.shared; | |
795bc6b3 AM |
51 | if (pagesize == 0) |
52 | pagesize = config.commonpagesize; | |
53 | params.pagesize_p2 = bfd_log2 (pagesize); | |
5446cbdf AM |
54 | ppc_elf_link_params (&link_info, ¶ms); |
55 | } | |
56 | ||
db434ba0 AM |
57 | EOF |
58 | ||
59 | # No --secure-plt, --bss-plt, or --sdata-got for vxworks. | |
60 | if test -z "$VXWORKS_BASE_EM_FILE" ; then | |
61 | fragment <<EOF | |
0cf7d72c AM |
62 | static void |
63 | ppc_after_open (void) | |
64 | { | |
5503fea1 | 65 | if (is_ppc_elf (link_info.output_bfd)) |
0cf7d72c AM |
66 | { |
67 | int new_plt; | |
68 | int keep_new; | |
69 | unsigned int num_plt; | |
70 | unsigned int num_got; | |
71 | lang_output_section_statement_type *os; | |
72 | lang_output_section_statement_type *plt_os[2]; | |
73 | lang_output_section_statement_type *got_os[2]; | |
74 | ||
5446cbdf | 75 | new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info); |
0cf7d72c AM |
76 | if (new_plt < 0) |
77 | einfo ("%X%P: select_plt_layout problem %E\n"); | |
78 | ||
79 | num_got = 0; | |
80 | num_plt = 0; | |
81 | for (os = &lang_output_section_statement.head->output_section_statement; | |
82 | os != NULL; | |
83 | os = os->next) | |
84 | { | |
85 | if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0) | |
86 | { | |
87 | if (num_plt < 2) | |
88 | plt_os[num_plt] = os; | |
89 | ++num_plt; | |
90 | } | |
91 | if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0) | |
92 | { | |
93 | if (num_got < 2) | |
94 | got_os[num_got] = os; | |
95 | ++num_got; | |
96 | } | |
97 | } | |
98 | ||
99 | keep_new = new_plt == 1 ? 0 : -1; | |
100 | if (num_plt == 2) | |
101 | { | |
102 | plt_os[0]->constraint = keep_new; | |
103 | plt_os[1]->constraint = ~keep_new; | |
104 | } | |
105 | if (num_got == 2) | |
106 | { | |
107 | if (old_got) | |
108 | keep_new = -1; | |
109 | got_os[0]->constraint = keep_new; | |
110 | got_os[1]->constraint = ~keep_new; | |
111 | } | |
112 | } | |
113 | ||
114 | gld${EMULATION_NAME}_after_open (); | |
115 | } | |
116 | ||
db434ba0 AM |
117 | EOF |
118 | fi | |
119 | fragment <<EOF | |
f9e6bfa8 | 120 | static void |
7e5d8d48 | 121 | ppc_before_allocation (void) |
f9e6bfa8 | 122 | { |
5503fea1 | 123 | if (is_ppc_elf (link_info.output_bfd)) |
f9e6bfa8 | 124 | { |
5446cbdf | 125 | if (ppc_elf_tls_setup (link_info.output_bfd, &link_info) |
a7f2871e | 126 | && !notlsopt) |
f9e6bfa8 | 127 | { |
f13a99db | 128 | if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info)) |
f9e6bfa8 AM |
129 | { |
130 | einfo ("%X%P: TLS problem %E\n"); | |
131 | return; | |
132 | } | |
133 | } | |
134 | } | |
4135c73b | 135 | |
f9e6bfa8 | 136 | gld${EMULATION_NAME}_before_allocation (); |
4135c73b | 137 | |
93d1b056 AM |
138 | ppc_elf_maybe_strip_sdata_syms (&link_info); |
139 | ||
5446cbdf AM |
140 | if (RELAXATION_ENABLED) |
141 | params.branch_trampolines = 1; | |
142 | ||
4135c73b AM |
143 | /* Turn on relaxation if executable sections have addresses that |
144 | might make branches overflow. */ | |
5446cbdf | 145 | else if (!RELAXATION_DISABLED_BY_USER) |
4135c73b AM |
146 | { |
147 | bfd_vma low = (bfd_vma) -1; | |
148 | bfd_vma high = 0; | |
149 | asection *o; | |
150 | ||
151 | /* Run lang_size_sections (if not already done). */ | |
152 | if (expld.phase != lang_mark_phase_enum) | |
153 | { | |
154 | expld.phase = lang_mark_phase_enum; | |
155 | expld.dataseg.phase = exp_dataseg_none; | |
156 | one_lang_size_sections_pass (NULL, FALSE); | |
157 | lang_reset_memory_regions (); | |
158 | } | |
159 | ||
160 | for (o = link_info.output_bfd->sections; o != NULL; o = o->next) | |
161 | { | |
162 | if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE)) | |
163 | continue; | |
07088e95 | 164 | if (o->rawsize == 0) |
4135c73b AM |
165 | continue; |
166 | if (low > o->vma) | |
167 | low = o->vma; | |
07088e95 AM |
168 | if (high < o->vma + o->rawsize - 1) |
169 | high = o->vma + o->rawsize - 1; | |
4135c73b AM |
170 | } |
171 | if (high > low && high - low > (1 << 25) - 1) | |
5446cbdf | 172 | params.branch_trampolines = 1; |
4135c73b | 173 | } |
5446cbdf | 174 | |
d3e454b9 AM |
175 | if (params.branch_trampolines |
176 | || params.ppc476_workaround | |
177 | || params.pic_fixup > 0) | |
5446cbdf | 178 | ENABLE_RELAXATION; |
f9e6bfa8 AM |
179 | } |
180 | ||
b4ab4364 AM |
181 | /* Replaces default zero fill padding in executable sections with |
182 | "ba 0" instructions. This works around the ppc476 icache bug if we | |
183 | have a function pointer tail call near the end of a page, some | |
184 | small amount of padding, then the function called at the beginning | |
185 | of the next page. If the "ba 0" is ever executed we should hit a | |
186 | segv, so it's almost as good as an illegal instruction (zero). */ | |
187 | ||
188 | static void | |
189 | no_zero_padding (lang_statement_union_type *l) | |
190 | { | |
191 | if (l->header.type == lang_padding_statement_enum | |
192 | && l->padding_statement.size != 0 | |
193 | && l->padding_statement.output_section != NULL | |
194 | && (l->padding_statement.output_section->flags & SEC_CODE) != 0 | |
195 | && l->padding_statement.fill->size == 0) | |
196 | { | |
197 | struct _ppc_fill_type | |
198 | { | |
199 | size_t size; | |
200 | unsigned char data[4]; | |
201 | }; | |
202 | static struct _ppc_fill_type fill_be = { 4, {0x48, 0, 0, 2} }; | |
203 | static struct _ppc_fill_type fill_le = { 4, {2, 0, 0, 0x48} }; | |
204 | ||
205 | if (bfd_big_endian (link_info.output_bfd)) | |
206 | l->padding_statement.fill = (struct _fill_type *) &fill_be; | |
207 | else | |
208 | l->padding_statement.fill = (struct _fill_type *) &fill_le; | |
209 | } | |
210 | } | |
211 | ||
212 | static void | |
213 | ppc_finish (void) | |
214 | { | |
215 | if (params.ppc476_workaround) | |
216 | lang_for_each_statement (no_zero_padding); | |
217 | finish_default (); | |
218 | } | |
219 | ||
f9e6bfa8 AM |
220 | EOF |
221 | ||
dc27aea4 | 222 | if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then |
92b93329 | 223 | fragment <<EOF |
dc27aea4 AM |
224 | /* Special handling for embedded SPU executables. */ |
225 | extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *); | |
226 | static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *); | |
227 | ||
228 | static bfd_boolean | |
229 | ppc_recognized_file (lang_input_statement_type *entry) | |
230 | { | |
231 | if (embedded_spu_file (entry, "-m32")) | |
232 | return TRUE; | |
233 | ||
234 | return gld${EMULATION_NAME}_load_symbols (entry); | |
235 | } | |
236 | ||
237 | EOF | |
238 | LDEMUL_RECOGNIZED_FILE=ppc_recognized_file | |
239 | fi | |
240 | ||
f9e6bfa8 AM |
241 | # Define some shell vars to insert bits of code into the standard elf |
242 | # parse_args and list_options functions. | |
243 | # | |
58d180e8 AM |
244 | PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}' |
245 | #define OPTION_NO_TLS_OPT 321 | |
a7f2871e AM |
246 | #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1) |
247 | #define OPTION_NEW_PLT (OPTION_NO_TLS_GET_ADDR_OPT + 1) | |
248 | #define OPTION_OLD_PLT (OPTION_NEW_PLT + 1) | |
249 | #define OPTION_OLD_GOT (OPTION_OLD_PLT + 1) | |
250 | #define OPTION_STUBSYMS (OPTION_OLD_GOT + 1) | |
b02c4cfa | 251 | #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1) |
5446cbdf AM |
252 | #define OPTION_PPC476_WORKAROUND (OPTION_NO_STUBSYMS + 1) |
253 | #define OPTION_NO_PPC476_WORKAROUND (OPTION_PPC476_WORKAROUND + 1) | |
d3e454b9 | 254 | #define OPTION_NO_PICFIXUP (OPTION_NO_PPC476_WORKAROUND + 1) |
f9e6bfa8 AM |
255 | ' |
256 | ||
58d180e8 | 257 | PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}' |
0ba07910 | 258 | { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS }, |
b02c4cfa | 259 | { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS }, |
f9e6bfa8 | 260 | { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT }, |
db434ba0 AM |
261 | { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },' |
262 | if test -z "$VXWORKS_BASE_EM_FILE" ; then | |
263 | PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}' | |
016687f8 | 264 | { "secure-plt", no_argument, NULL, OPTION_NEW_PLT }, |
0cf7d72c | 265 | { "bss-plt", no_argument, NULL, OPTION_OLD_PLT }, |
db434ba0 AM |
266 | { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },' |
267 | fi | |
268 | PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}' | |
5446cbdf AM |
269 | { "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND }, |
270 | { "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND }, | |
d3e454b9 | 271 | { "no-pic-fixup", no_argument, NULL, OPTION_NO_PICFIXUP }, |
f9e6bfa8 AM |
272 | ' |
273 | ||
58d180e8 | 274 | PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}' |
f9e6bfa8 | 275 | fprintf (file, _("\ |
442996ee | 276 | --emit-stub-syms Label linker stubs with a symbol.\n\ |
b02c4cfa | 277 | --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n\ |
442996ee | 278 | --no-tls-optimize Don'\''t try to optimize TLS accesses.\n\ |
db434ba0 AM |
279 | --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n' |
280 | if test -z "$VXWORKS_BASE_EM_FILE" ; then | |
281 | PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\ | |
442996ee AM |
282 | --secure-plt Use new-style PLT if possible.\n\ |
283 | --bss-plt Force old-style BSS PLT.\n\ | |
db434ba0 AM |
284 | --sdata-got Force GOT location just before .sdata.\n' |
285 | fi | |
286 | PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\ | |
5446cbdf AM |
287 | --ppc476-workaround [=pagesize]\n\ |
288 | Avoid a cache bug on ppc476.\n\ | |
d3e454b9 AM |
289 | --no-ppc476-workaround Disable workaround.\n\ |
290 | --no-pic-fixup Don'\''t edit non-pic to pic.\n" | |
f9e6bfa8 AM |
291 | )); |
292 | ' | |
293 | ||
58d180e8 | 294 | PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}' |
0ba07910 | 295 | case OPTION_STUBSYMS: |
5446cbdf | 296 | params.emit_stub_syms = 1; |
0ba07910 AM |
297 | break; |
298 | ||
b02c4cfa | 299 | case OPTION_NO_STUBSYMS: |
5446cbdf | 300 | params.emit_stub_syms = 0; |
b02c4cfa AM |
301 | break; |
302 | ||
f9e6bfa8 AM |
303 | case OPTION_NO_TLS_OPT: |
304 | notlsopt = 1; | |
305 | break; | |
0cf7d72c | 306 | |
a7f2871e | 307 | case OPTION_NO_TLS_GET_ADDR_OPT: |
5446cbdf | 308 | params.no_tls_get_addr_opt = 1; |
a7f2871e AM |
309 | break; |
310 | ||
016687f8 | 311 | case OPTION_NEW_PLT: |
5446cbdf | 312 | params.plt_style = PLT_NEW; |
016687f8 AM |
313 | break; |
314 | ||
0cf7d72c | 315 | case OPTION_OLD_PLT: |
5446cbdf | 316 | params.plt_style = PLT_OLD; |
0cf7d72c AM |
317 | break; |
318 | ||
319 | case OPTION_OLD_GOT: | |
320 | old_got = 1; | |
321 | break; | |
f05eb3b7 AM |
322 | |
323 | case OPTION_TRADITIONAL_FORMAT: | |
324 | notlsopt = 1; | |
5446cbdf | 325 | params.no_tls_get_addr_opt = 1; |
f05eb3b7 | 326 | return FALSE; |
5446cbdf AM |
327 | |
328 | case OPTION_PPC476_WORKAROUND: | |
329 | params.ppc476_workaround = 1; | |
330 | if (optarg != NULL) | |
331 | { | |
332 | char *end; | |
795bc6b3 | 333 | pagesize = strtoul (optarg, &end, 0); |
5446cbdf | 334 | if (*end |
795bc6b3 AM |
335 | || (pagesize < 4096 && pagesize != 0) |
336 | || pagesize != (pagesize & -pagesize)) | |
5446cbdf AM |
337 | einfo (_("%P%F: invalid pagesize `%s'\''\n"), optarg); |
338 | } | |
339 | break; | |
340 | ||
341 | case OPTION_NO_PPC476_WORKAROUND: | |
342 | params.ppc476_workaround = 0; | |
343 | break; | |
d3e454b9 AM |
344 | |
345 | case OPTION_NO_PICFIXUP: | |
346 | params.pic_fixup = -1; | |
347 | break; | |
f9e6bfa8 AM |
348 | ' |
349 | ||
c9a2f333 | 350 | # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation |
f9e6bfa8 | 351 | # |
5446cbdf | 352 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output |
db434ba0 AM |
353 | if test -z "$VXWORKS_BASE_EM_FILE" ; then |
354 | LDEMUL_AFTER_OPEN=ppc_after_open | |
355 | fi | |
f9e6bfa8 | 356 | LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation |
b4ab4364 | 357 | LDEMUL_FINISH=ppc_finish |