1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2003-2018 Free Software Foundation, Inc.
4 # This file is part of the GNU Binutils.
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 3 of the License, or
9 # (at your option) any later version.
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.
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,
22 # This file is sourced from elf32.em, and defines extra powerpc32-elf
27 #include "elf32-ppc.h"
31 #define is_ppc_elf(bfd) \
32 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
33 && elf_object_id (bfd) == PPC32_ELF_DATA)
35 /* Whether to run tls optimization. */
36 static int notlsopt = 0;
38 /* Choose the correct place for .got. */
39 static int old_got = 0;
41 static struct ppc_elf_params params = { PLT_UNSET, 0, -1,
42 0, 0, 0, 0, 0, 0, 0 };
45 ppc_after_open_output (void)
47 if (params.emit_stub_syms < 0)
48 params.emit_stub_syms = (link_info.emitrelocations
49 || bfd_link_pic (&link_info));
50 if (params.pagesize == 0)
51 params.pagesize = config.commonpagesize;
52 ppc_elf_link_params (&link_info, ¶ms);
57 # No --secure-plt, --bss-plt, or --sdata-got for vxworks.
58 if test -z "$VXWORKS_BASE_EM_FILE" ; then
61 ppc_after_check_relocs (void)
63 if (is_ppc_elf (link_info.output_bfd))
69 lang_output_section_statement_type *os;
70 lang_output_section_statement_type *plt_os[2];
71 lang_output_section_statement_type *got_os[2];
73 new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info);
75 einfo (_("%X%P: select_plt_layout problem %E\n"));
79 for (os = &lang_output_section_statement.head->output_section_statement;
83 if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
89 if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
97 keep_new = new_plt == 1 ? 0 : -1;
100 plt_os[0]->constraint = keep_new;
101 plt_os[1]->constraint = ~keep_new;
107 got_os[0]->constraint = keep_new;
108 got_os[1]->constraint = ~keep_new;
112 after_check_relocs_default ();
119 ppc_before_allocation (void)
121 if (is_ppc_elf (link_info.output_bfd))
123 if (ppc_elf_tls_setup (link_info.output_bfd, &link_info)
126 if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
128 einfo (_("%X%P: TLS problem %E\n"));
134 gld${EMULATION_NAME}_before_allocation ();
136 ppc_elf_maybe_strip_sdata_syms (&link_info);
138 if (RELAXATION_ENABLED)
139 params.branch_trampolines = 1;
141 /* Turn on relaxation if executable sections have addresses that
142 might make branches overflow. */
143 else if (!RELAXATION_DISABLED_BY_USER)
145 bfd_vma low = (bfd_vma) -1;
149 /* Run lang_size_sections (if not already done). */
150 if (expld.phase != lang_mark_phase_enum)
152 expld.phase = lang_mark_phase_enum;
153 expld.dataseg.phase = exp_seg_none;
154 one_lang_size_sections_pass (NULL, FALSE);
155 lang_reset_memory_regions ();
158 for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
160 if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
166 if (high < o->vma + o->rawsize - 1)
167 high = o->vma + o->rawsize - 1;
169 if (high > low && high - low > (1 << 25) - 1)
170 params.branch_trampolines = 1;
173 if (params.branch_trampolines
174 || params.ppc476_workaround
175 || params.pic_fixup > 0)
179 /* Replaces default zero fill padding in executable sections with
180 "ba 0" instructions. This works around the ppc476 icache bug if we
181 have a function pointer tail call near the end of a page, some
182 small amount of padding, then the function called at the beginning
183 of the next page. If the "ba 0" is ever executed we should hit a
184 segv, so it's almost as good as an illegal instruction (zero). */
187 no_zero_padding (lang_statement_union_type *l)
189 if (l->header.type == lang_padding_statement_enum
190 && l->padding_statement.size != 0
191 && l->padding_statement.output_section != NULL
192 && (l->padding_statement.output_section->flags & SEC_CODE) != 0
193 && l->padding_statement.fill->size == 0)
195 struct _ppc_fill_type
198 unsigned char data[4];
200 static struct _ppc_fill_type fill_be = { 4, {0x48, 0, 0, 2} };
201 static struct _ppc_fill_type fill_le = { 4, {2, 0, 0, 0x48} };
203 if (bfd_big_endian (link_info.output_bfd))
204 l->padding_statement.fill = (struct _fill_type *) &fill_be;
206 l->padding_statement.fill = (struct _fill_type *) &fill_le;
213 if (params.ppc476_workaround)
214 lang_for_each_statement (no_zero_padding);
215 if (!ppc_finish_symbols (&link_info))
216 einfo (_("%X%P: ppc_finish_symbols problem %E\n"));
222 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
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${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
229 ppc_recognized_file (lang_input_statement_type *entry)
231 if (embedded_spu_file (entry, "-m32"))
234 return gld${EMULATION_NAME}_load_symbols (entry);
238 LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
241 # Define some shell vars to insert bits of code into the standard elf
242 # parse_args and list_options functions.
244 PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
247 OPTION_NO_TLS_OPT = 321,
248 OPTION_NO_TLS_GET_ADDR_OPT,
256 OPTION_PPC476_WORKAROUND,
257 OPTION_NO_PPC476_WORKAROUND,
259 OPTION_VLE_RELOC_FIXUP
263 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
264 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
265 { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
266 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
267 { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },'
268 if test -z "$VXWORKS_BASE_EM_FILE" ; then
269 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
270 { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
271 { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
272 { "plt-align", optional_argument, NULL, OPTION_PLT_ALIGN },
273 { "no-plt-align", no_argument, NULL, OPTION_NO_PLT_ALIGN },
274 { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },'
276 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
277 { "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND },
278 { "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND },
279 { "no-pic-fixup", no_argument, NULL, OPTION_NO_PICFIXUP },
280 { "vle-reloc-fixup", no_argument, NULL, OPTION_VLE_RELOC_FIXUP },
283 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
285 --emit-stub-syms Label linker stubs with a symbol\n"
288 --no-emit-stub-syms Don'\''t label linker stubs with a symbol\n"
291 --no-tls-optimize Don'\''t try to optimize TLS accesses\n"
294 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call\n"
296 if test -z "$VXWORKS_BASE_EM_FILE" ; then
297 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
299 --secure-plt Use new-style PLT if possible\n"
302 --bss-plt Force old-style BSS PLT\n"
305 --plt-align Align PLT call stubs to fit cache lines\n"
308 --no-plt-align Dont'\''t align individual PLT call stubs\n"
311 --sdata-got Force GOT location just before .sdata\n"
314 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
316 --ppc476-workaround [=pagesize]\n\
317 Avoid a cache bug on ppc476\n"
320 --no-ppc476-workaround Disable workaround\n"
323 --no-pic-fixup Don'\''t edit non-pic to pic\n"
326 --vle-reloc-fixup Correct old object file 16A/16D relocation\n"
330 PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
331 case OPTION_STUBSYMS:
332 params.emit_stub_syms = 1;
335 case OPTION_NO_STUBSYMS:
336 params.emit_stub_syms = 0;
339 case OPTION_NO_TLS_OPT:
343 case OPTION_NO_TLS_GET_ADDR_OPT:
344 params.no_tls_get_addr_opt = 1;
348 params.plt_style = PLT_NEW;
352 params.plt_style = PLT_OLD;
355 case OPTION_PLT_ALIGN:
359 unsigned long val = strtoul (optarg, &end, 0);
361 einfo (_("%F%P: invalid --plt-align `%s'\''\n"), optarg);
362 params.plt_stub_align = val;
365 params.plt_stub_align = 5;
368 case OPTION_NO_PLT_ALIGN:
369 params.plt_stub_align = 0;
376 case OPTION_TRADITIONAL_FORMAT:
378 params.no_tls_get_addr_opt = 1;
381 case OPTION_PPC476_WORKAROUND:
382 params.ppc476_workaround = 1;
386 params.pagesize = strtoul (optarg, &end, 0);
388 || (params.pagesize < 4096 && params.pagesize != 0)
389 || params.pagesize != (params.pagesize & -params.pagesize))
390 einfo (_("%F%P: invalid pagesize `%s'\''\n"), optarg);
394 case OPTION_NO_PPC476_WORKAROUND:
395 params.ppc476_workaround = 0;
398 case OPTION_NO_PICFIXUP:
399 params.pic_fixup = -1;
402 case OPTION_VLE_RELOC_FIXUP:
403 params.vle_reloc_fixup = 1;
407 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
409 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output
410 if test -z "$VXWORKS_BASE_EM_FILE" ; then
411 LDEMUL_AFTER_CHECK_RELOCS=ppc_after_check_relocs
413 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
414 LDEMUL_FINISH=ppc_finish