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# This shell script emits a C file. -*- C -*-
# Copyright 2003, 2005, 2007, 2008, 2009, 2010, 2011
# Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# This file is sourced from elf32.em, and defines extra powerpc32-elf
# specific routines.
#
fragment <<EOF
#include "libbfd.h"
#include "elf32-ppc.h"
#define is_ppc_elf(bfd) \
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
&& elf_object_id (bfd) == PPC32_ELF_DATA)
/* Whether to run tls optimization. */
static int notlsopt = 0;
static int no_tls_get_addr_opt = 0;
/* Whether to emit symbols for stubs. */
static int emit_stub_syms = -1;
/* Chooses the correct place for .plt and .got. */
static enum ppc_elf_plt_type plt_style = PLT_UNSET;
static int old_got = 0;
static void
ppc_after_open (void)
{
if (is_ppc_elf (link_info.output_bfd))
{
int new_plt;
int keep_new;
unsigned int num_plt;
unsigned int num_got;
lang_output_section_statement_type *os;
lang_output_section_statement_type *plt_os[2];
lang_output_section_statement_type *got_os[2];
if (emit_stub_syms < 0)
emit_stub_syms = link_info.emitrelocations || link_info.shared;
new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info,
plt_style, emit_stub_syms);
if (new_plt < 0)
einfo ("%X%P: select_plt_layout problem %E\n");
num_got = 0;
num_plt = 0;
for (os = &lang_output_section_statement.head->output_section_statement;
os != NULL;
os = os->next)
{
if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
{
if (num_plt < 2)
plt_os[num_plt] = os;
++num_plt;
}
if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
{
if (num_got < 2)
got_os[num_got] = os;
++num_got;
}
}
keep_new = new_plt == 1 ? 0 : -1;
if (num_plt == 2)
{
plt_os[0]->constraint = keep_new;
plt_os[1]->constraint = ~keep_new;
}
if (num_got == 2)
{
if (old_got)
keep_new = -1;
got_os[0]->constraint = keep_new;
got_os[1]->constraint = ~keep_new;
}
}
gld${EMULATION_NAME}_after_open ();
}
static void
ppc_before_allocation (void)
{
if (is_ppc_elf (link_info.output_bfd))
{
if (ppc_elf_tls_setup (link_info.output_bfd, &link_info,
no_tls_get_addr_opt)
&& !notlsopt)
{
if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
{
einfo ("%X%P: TLS problem %E\n");
return;
}
}
}
gld${EMULATION_NAME}_before_allocation ();
/* Turn on relaxation if executable sections have addresses that
might make branches overflow. */
if (RELAXATION_DISABLED_BY_DEFAULT)
{
bfd_vma low = (bfd_vma) -1;
bfd_vma high = 0;
asection *o;
/* Run lang_size_sections (if not already done). */
if (expld.phase != lang_mark_phase_enum)
{
expld.phase = lang_mark_phase_enum;
expld.dataseg.phase = exp_dataseg_none;
one_lang_size_sections_pass (NULL, FALSE);
lang_reset_memory_regions ();
}
for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
{
if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
continue;
if (o->rawsize == 0)
continue;
if (low > o->vma)
low = o->vma;
if (high < o->vma + o->rawsize - 1)
high = o->vma + o->rawsize - 1;
}
if (high > low && high - low > (1 << 25) - 1)
ENABLE_RELAXATION;
}
}
EOF
if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
fragment <<EOF
/* Special handling for embedded SPU executables. */
extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
static bfd_boolean
ppc_recognized_file (lang_input_statement_type *entry)
{
if (embedded_spu_file (entry, "-m32"))
return TRUE;
return gld${EMULATION_NAME}_load_symbols (entry);
}
EOF
LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
fi
# Define some shell vars to insert bits of code into the standard elf
# parse_args and list_options functions.
#
PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
#define OPTION_NO_TLS_OPT 321
#define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
#define OPTION_NEW_PLT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
#define OPTION_OLD_PLT (OPTION_NEW_PLT + 1)
#define OPTION_OLD_GOT (OPTION_OLD_PLT + 1)
#define OPTION_STUBSYMS (OPTION_OLD_GOT + 1)
#define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
'
PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
{ "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
{ "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
{ "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
{ "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
{ "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
{ "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
{ "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
'
PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
fprintf (file, _("\
--emit-stub-syms Label linker stubs with a symbol.\n\
--no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n\
--no-tls-optimize Don'\''t try to optimize TLS accesses.\n\
--no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n\
--secure-plt Use new-style PLT if possible.\n\
--bss-plt Force old-style BSS PLT.\n\
--sdata-got Force GOT location just before .sdata.\n"
));
'
PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
case OPTION_STUBSYMS:
emit_stub_syms = 1;
break;
case OPTION_NO_STUBSYMS:
emit_stub_syms = 0;
break;
case OPTION_NO_TLS_OPT:
notlsopt = 1;
break;
case OPTION_NO_TLS_GET_ADDR_OPT:
no_tls_get_addr_opt = 1;
break;
case OPTION_NEW_PLT:
plt_style = PLT_NEW;
break;
case OPTION_OLD_PLT:
plt_style = PLT_OLD;
break;
case OPTION_OLD_GOT:
old_got = 1;
break;
'
# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_AFTER_OPEN=ppc_after_open
LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
|
