1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2003-2014 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
28 #include "elf32-ppc.h"
32 #define is_ppc_elf(bfd) \
33 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
34 && elf_object_id (bfd) == PPC32_ELF_DATA)
36 /* Whether to run tls optimization. */
37 static int notlsopt = 0;
39 /* Choose the correct place for .got. */
40 static int old_got = 0;
42 static bfd_vma pagesize = 0;
44 static struct ppc_elf_params params = { PLT_UNSET, -1, 0, 0, 0, 0 };
47 ppc_after_open_output (void)
49 if (params.emit_stub_syms < 0)
50 params.emit_stub_syms = link_info.emitrelocations || link_info.shared;
52 pagesize = config.commonpagesize;
53 params.pagesize_p2 = bfd_log2 (pagesize);
54 ppc_elf_link_params (&link_info, ¶ms);
59 # No --secure-plt, --bss-plt, or --sdata-got for vxworks.
60 if test -z "$VXWORKS_BASE_EM_FILE" ; then
65 if (is_ppc_elf (link_info.output_bfd))
71 lang_output_section_statement_type *os;
72 lang_output_section_statement_type *plt_os[2];
73 lang_output_section_statement_type *got_os[2];
75 new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info);
77 einfo ("%X%P: select_plt_layout problem %E\n");
81 for (os = &lang_output_section_statement.head->output_section_statement;
85 if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
91 if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
99 keep_new = new_plt == 1 ? 0 : -1;
102 plt_os[0]->constraint = keep_new;
103 plt_os[1]->constraint = ~keep_new;
109 got_os[0]->constraint = keep_new;
110 got_os[1]->constraint = ~keep_new;
114 gld${EMULATION_NAME}_after_open ();
121 ppc_before_allocation (void)
123 if (is_ppc_elf (link_info.output_bfd))
125 if (ppc_elf_tls_setup (link_info.output_bfd, &link_info)
128 if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
130 einfo ("%X%P: TLS problem %E\n");
136 gld${EMULATION_NAME}_before_allocation ();
138 ppc_elf_maybe_strip_sdata_syms (&link_info);
140 if (RELAXATION_ENABLED)
141 params.branch_trampolines = 1;
143 /* Turn on relaxation if executable sections have addresses that
144 might make branches overflow. */
145 else if (!RELAXATION_DISABLED_BY_USER)
147 bfd_vma low = (bfd_vma) -1;
151 /* Run lang_size_sections (if not already done). */
152 if (expld.phase != lang_mark_phase_enum)
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 ();
160 for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
162 if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
168 if (high < o->vma + o->rawsize - 1)
169 high = o->vma + o->rawsize - 1;
171 if (high > low && high - low > (1 << 25) - 1)
172 params.branch_trampolines = 1;
175 if (params.ppc476_workaround || params.branch_trampolines)
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);
220 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
222 /* Special handling for embedded SPU executables. */
223 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
224 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
227 ppc_recognized_file (lang_input_statement_type *entry)
229 if (embedded_spu_file (entry, "-m32"))
232 return gld${EMULATION_NAME}_load_symbols (entry);
236 LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
239 # Define some shell vars to insert bits of code into the standard elf
240 # parse_args and list_options functions.
242 PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
243 #define OPTION_NO_TLS_OPT 321
244 #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
245 #define OPTION_NEW_PLT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
246 #define OPTION_OLD_PLT (OPTION_NEW_PLT + 1)
247 #define OPTION_OLD_GOT (OPTION_OLD_PLT + 1)
248 #define OPTION_STUBSYMS (OPTION_OLD_GOT + 1)
249 #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
250 #define OPTION_PPC476_WORKAROUND (OPTION_NO_STUBSYMS + 1)
251 #define OPTION_NO_PPC476_WORKAROUND (OPTION_PPC476_WORKAROUND + 1)
254 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
255 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
256 { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
257 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
258 { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },'
259 if test -z "$VXWORKS_BASE_EM_FILE" ; then
260 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
261 { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
262 { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
263 { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },'
265 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
266 { "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND },
267 { "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND },
270 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
272 --emit-stub-syms Label linker stubs with a symbol.\n\
273 --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n\
274 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n\
275 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n'
276 if test -z "$VXWORKS_BASE_EM_FILE" ; then
277 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
278 --secure-plt Use new-style PLT if possible.\n\
279 --bss-plt Force old-style BSS PLT.\n\
280 --sdata-got Force GOT location just before .sdata.\n'
282 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
283 --ppc476-workaround [=pagesize]\n\
284 Avoid a cache bug on ppc476.\n\
285 --no-ppc476-workaround Disable workaround.\n"
289 PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
290 case OPTION_STUBSYMS:
291 params.emit_stub_syms = 1;
294 case OPTION_NO_STUBSYMS:
295 params.emit_stub_syms = 0;
298 case OPTION_NO_TLS_OPT:
302 case OPTION_NO_TLS_GET_ADDR_OPT:
303 params.no_tls_get_addr_opt = 1;
307 params.plt_style = PLT_NEW;
311 params.plt_style = PLT_OLD;
318 case OPTION_TRADITIONAL_FORMAT:
320 params.no_tls_get_addr_opt = 1;
323 case OPTION_PPC476_WORKAROUND:
324 params.ppc476_workaround = 1;
328 pagesize = strtoul (optarg, &end, 0);
330 || (pagesize < 4096 && pagesize != 0)
331 || pagesize != (pagesize & -pagesize))
332 einfo (_("%P%F: invalid pagesize `%s'\''\n"), optarg);
336 case OPTION_NO_PPC476_WORKAROUND:
337 params.ppc476_workaround = 0;
341 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
343 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output
344 if test -z "$VXWORKS_BASE_EM_FILE" ; then
345 LDEMUL_AFTER_OPEN=ppc_after_open
347 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
348 LDEMUL_FINISH=ppc_finish