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359 lines
10 KiB
Plaintext
359 lines
10 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# Copyright (C) 2003-2016 Free Software Foundation, Inc.
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#
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# This file is part of the GNU Binutils.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# This file is sourced from elf32.em, and defines extra powerpc32-elf
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# specific routines.
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#
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fragment <<EOF
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#include "libbfd.h"
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#include "elf32-ppc.h"
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#include "ldlex.h"
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#include "ldlang.h"
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#define is_ppc_elf(bfd) \
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(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
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&& elf_object_id (bfd) == PPC32_ELF_DATA)
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/* Whether to run tls optimization. */
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static int notlsopt = 0;
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/* Choose the correct place for .got. */
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static int old_got = 0;
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static bfd_vma pagesize = 0;
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static struct ppc_elf_params params = { PLT_UNSET, -1, 0, 0, 0, 0, 0 };
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static void
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ppc_after_open_output (void)
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{
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if (params.emit_stub_syms < 0)
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params.emit_stub_syms = (link_info.emitrelocations
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|| bfd_link_pic (&link_info));
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if (pagesize == 0)
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pagesize = config.commonpagesize;
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params.pagesize_p2 = bfd_log2 (pagesize);
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ppc_elf_link_params (&link_info, ¶ms);
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}
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EOF
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# No --secure-plt, --bss-plt, or --sdata-got for vxworks.
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if test -z "$VXWORKS_BASE_EM_FILE" ; then
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fragment <<EOF
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static void
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ppc_after_open (void)
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{
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if (is_ppc_elf (link_info.output_bfd))
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{
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int new_plt;
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int keep_new;
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unsigned int num_plt;
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unsigned int num_got;
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lang_output_section_statement_type *os;
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lang_output_section_statement_type *plt_os[2];
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lang_output_section_statement_type *got_os[2];
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new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info);
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if (new_plt < 0)
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einfo ("%X%P: select_plt_layout problem %E\n");
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num_got = 0;
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num_plt = 0;
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for (os = &lang_output_section_statement.head->output_section_statement;
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os != NULL;
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os = os->next)
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{
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if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
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{
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if (num_plt < 2)
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plt_os[num_plt] = os;
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++num_plt;
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}
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if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
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{
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if (num_got < 2)
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got_os[num_got] = os;
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++num_got;
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}
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}
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keep_new = new_plt == 1 ? 0 : -1;
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if (num_plt == 2)
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{
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plt_os[0]->constraint = keep_new;
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plt_os[1]->constraint = ~keep_new;
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}
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if (num_got == 2)
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{
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if (old_got)
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keep_new = -1;
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got_os[0]->constraint = keep_new;
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got_os[1]->constraint = ~keep_new;
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}
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}
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gld${EMULATION_NAME}_after_open ();
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}
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EOF
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fi
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fragment <<EOF
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static void
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ppc_before_allocation (void)
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{
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if (is_ppc_elf (link_info.output_bfd))
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{
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if (ppc_elf_tls_setup (link_info.output_bfd, &link_info)
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&& !notlsopt)
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{
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if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
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{
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einfo ("%X%P: TLS problem %E\n");
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return;
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}
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}
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}
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gld${EMULATION_NAME}_before_allocation ();
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ppc_elf_maybe_strip_sdata_syms (&link_info);
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if (RELAXATION_ENABLED)
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params.branch_trampolines = 1;
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/* Turn on relaxation if executable sections have addresses that
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might make branches overflow. */
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else if (!RELAXATION_DISABLED_BY_USER)
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{
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bfd_vma low = (bfd_vma) -1;
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bfd_vma high = 0;
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asection *o;
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/* Run lang_size_sections (if not already done). */
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if (expld.phase != lang_mark_phase_enum)
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{
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expld.phase = lang_mark_phase_enum;
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expld.dataseg.phase = exp_dataseg_none;
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one_lang_size_sections_pass (NULL, FALSE);
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lang_reset_memory_regions ();
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}
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for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
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{
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if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
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continue;
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if (o->rawsize == 0)
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continue;
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if (low > o->vma)
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low = o->vma;
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if (high < o->vma + o->rawsize - 1)
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high = o->vma + o->rawsize - 1;
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}
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if (high > low && high - low > (1 << 25) - 1)
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params.branch_trampolines = 1;
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}
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if (params.branch_trampolines
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|| params.ppc476_workaround
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|| params.pic_fixup > 0)
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ENABLE_RELAXATION;
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}
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/* Replaces default zero fill padding in executable sections with
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"ba 0" instructions. This works around the ppc476 icache bug if we
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have a function pointer tail call near the end of a page, some
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small amount of padding, then the function called at the beginning
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of the next page. If the "ba 0" is ever executed we should hit a
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segv, so it's almost as good as an illegal instruction (zero). */
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static void
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no_zero_padding (lang_statement_union_type *l)
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{
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if (l->header.type == lang_padding_statement_enum
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&& l->padding_statement.size != 0
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&& l->padding_statement.output_section != NULL
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&& (l->padding_statement.output_section->flags & SEC_CODE) != 0
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&& l->padding_statement.fill->size == 0)
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{
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struct _ppc_fill_type
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{
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size_t size;
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unsigned char data[4];
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};
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static struct _ppc_fill_type fill_be = { 4, {0x48, 0, 0, 2} };
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static struct _ppc_fill_type fill_le = { 4, {2, 0, 0, 0x48} };
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if (bfd_big_endian (link_info.output_bfd))
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l->padding_statement.fill = (struct _fill_type *) &fill_be;
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else
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l->padding_statement.fill = (struct _fill_type *) &fill_le;
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}
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}
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static void
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ppc_finish (void)
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{
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if (params.ppc476_workaround)
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lang_for_each_statement (no_zero_padding);
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finish_default ();
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}
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EOF
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if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
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fragment <<EOF
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/* Special handling for embedded SPU executables. */
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extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
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static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
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static bfd_boolean
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ppc_recognized_file (lang_input_statement_type *entry)
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{
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if (embedded_spu_file (entry, "-m32"))
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return TRUE;
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return gld${EMULATION_NAME}_load_symbols (entry);
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}
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EOF
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LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
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fi
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# Define some shell vars to insert bits of code into the standard elf
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# parse_args and list_options functions.
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#
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PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
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#define OPTION_NO_TLS_OPT 321
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#define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
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#define OPTION_NEW_PLT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
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#define OPTION_OLD_PLT (OPTION_NEW_PLT + 1)
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#define OPTION_OLD_GOT (OPTION_OLD_PLT + 1)
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#define OPTION_STUBSYMS (OPTION_OLD_GOT + 1)
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#define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
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#define OPTION_PPC476_WORKAROUND (OPTION_NO_STUBSYMS + 1)
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#define OPTION_NO_PPC476_WORKAROUND (OPTION_PPC476_WORKAROUND + 1)
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#define OPTION_NO_PICFIXUP (OPTION_NO_PPC476_WORKAROUND + 1)
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'
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PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
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{ "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
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{ "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
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{ "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
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{ "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },'
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if test -z "$VXWORKS_BASE_EM_FILE" ; then
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PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
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{ "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
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{ "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
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{ "sdata-got", no_argument, NULL, OPTION_OLD_GOT },'
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fi
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PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
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{ "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND },
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{ "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND },
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{ "no-pic-fixup", no_argument, NULL, OPTION_NO_PICFIXUP },
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'
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PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
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fprintf (file, _("\
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--emit-stub-syms Label linker stubs with a symbol.\n\
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--no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n\
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--no-tls-optimize Don'\''t try to optimize TLS accesses.\n\
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--no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n'
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if test -z "$VXWORKS_BASE_EM_FILE" ; then
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PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
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--secure-plt Use new-style PLT if possible.\n\
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--bss-plt Force old-style BSS PLT.\n\
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--sdata-got Force GOT location just before .sdata.\n'
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fi
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PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
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--ppc476-workaround [=pagesize]\n\
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Avoid a cache bug on ppc476.\n\
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--no-ppc476-workaround Disable workaround.\n\
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--no-pic-fixup Don'\''t edit non-pic to pic.\n"
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));
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'
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PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
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case OPTION_STUBSYMS:
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params.emit_stub_syms = 1;
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break;
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case OPTION_NO_STUBSYMS:
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params.emit_stub_syms = 0;
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break;
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case OPTION_NO_TLS_OPT:
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notlsopt = 1;
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break;
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case OPTION_NO_TLS_GET_ADDR_OPT:
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params.no_tls_get_addr_opt = 1;
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break;
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case OPTION_NEW_PLT:
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params.plt_style = PLT_NEW;
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break;
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case OPTION_OLD_PLT:
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params.plt_style = PLT_OLD;
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break;
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case OPTION_OLD_GOT:
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old_got = 1;
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break;
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case OPTION_TRADITIONAL_FORMAT:
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notlsopt = 1;
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params.no_tls_get_addr_opt = 1;
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return FALSE;
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case OPTION_PPC476_WORKAROUND:
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params.ppc476_workaround = 1;
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if (optarg != NULL)
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{
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char *end;
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pagesize = strtoul (optarg, &end, 0);
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if (*end
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|| (pagesize < 4096 && pagesize != 0)
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|| pagesize != (pagesize & -pagesize))
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einfo (_("%P%F: invalid pagesize `%s'\''\n"), optarg);
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}
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break;
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case OPTION_NO_PPC476_WORKAROUND:
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params.ppc476_workaround = 0;
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break;
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case OPTION_NO_PICFIXUP:
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params.pic_fixup = -1;
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break;
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'
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# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
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#
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LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output
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if test -z "$VXWORKS_BASE_EM_FILE" ; then
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LDEMUL_AFTER_OPEN=ppc_after_open
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fi
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LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
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LDEMUL_FINISH=ppc_finish
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