443 lines
12 KiB
Plaintext
443 lines
12 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
|
|
# Copyright (C) 2003-2019 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 "elf32-ppc.h"
|
|
#include "ldlex.h"
|
|
#include "ldlang.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;
|
|
|
|
/* Whether to convert inline PLT calls to direct. */
|
|
static int no_inline_opt = 0;
|
|
|
|
/* Choose the correct place for .got. */
|
|
static int old_got = 0;
|
|
|
|
static struct ppc_elf_params params = { PLT_UNSET, 0, -1,
|
|
0, 0, 0, 0, 0, 0, 0 };
|
|
|
|
static void
|
|
ppc_after_open_output (void)
|
|
{
|
|
if (params.emit_stub_syms < 0)
|
|
params.emit_stub_syms = (link_info.emitrelocations
|
|
|| bfd_link_pic (&link_info));
|
|
if (params.pagesize == 0)
|
|
params.pagesize = config.commonpagesize;
|
|
ppc_elf_link_params (&link_info, ¶ms);
|
|
}
|
|
|
|
EOF
|
|
|
|
# No --secure-plt, --bss-plt, or --sdata-got for vxworks.
|
|
if test -z "$VXWORKS_BASE_EM_FILE" ; then
|
|
fragment <<EOF
|
|
static void
|
|
ppc_after_check_relocs (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];
|
|
|
|
new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info);
|
|
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;
|
|
}
|
|
}
|
|
|
|
after_check_relocs_default ();
|
|
}
|
|
|
|
EOF
|
|
fi
|
|
fragment <<EOF
|
|
static void
|
|
prelim_size_sections (void)
|
|
{
|
|
if (expld.phase != lang_mark_phase_enum)
|
|
{
|
|
expld.phase = lang_mark_phase_enum;
|
|
expld.dataseg.phase = exp_seg_none;
|
|
one_lang_size_sections_pass (NULL, FALSE);
|
|
/* We must not cache anything from the preliminary sizing. */
|
|
lang_reset_memory_regions ();
|
|
}
|
|
}
|
|
|
|
static void
|
|
ppc_before_allocation (void)
|
|
{
|
|
if (is_ppc_elf (link_info.output_bfd))
|
|
{
|
|
if (!no_inline_opt
|
|
&& !bfd_link_relocatable (&link_info))
|
|
{
|
|
prelim_size_sections ();
|
|
|
|
if (!ppc_elf_inline_plt (&link_info))
|
|
einfo (_("%X%P: inline PLT: %E\n"));
|
|
}
|
|
|
|
if (ppc_elf_tls_setup (link_info.output_bfd, &link_info)
|
|
&& !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 ();
|
|
|
|
ppc_elf_maybe_strip_sdata_syms (&link_info);
|
|
|
|
if (RELAXATION_ENABLED)
|
|
params.branch_trampolines = 1;
|
|
|
|
/* Turn on relaxation if executable sections have addresses that
|
|
might make branches overflow. */
|
|
else if (!RELAXATION_DISABLED_BY_USER)
|
|
{
|
|
bfd_vma low = (bfd_vma) -1;
|
|
bfd_vma high = 0;
|
|
asection *o;
|
|
|
|
/* Run lang_size_sections (if not already done). */
|
|
prelim_size_sections ();
|
|
|
|
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)
|
|
params.branch_trampolines = 1;
|
|
}
|
|
|
|
if (params.branch_trampolines
|
|
|| params.ppc476_workaround
|
|
|| params.pic_fixup > 0)
|
|
ENABLE_RELAXATION;
|
|
}
|
|
|
|
/* Replaces default zero fill padding in executable sections with
|
|
"ba 0" instructions. This works around the ppc476 icache bug if we
|
|
have a function pointer tail call near the end of a page, some
|
|
small amount of padding, then the function called at the beginning
|
|
of the next page. If the "ba 0" is ever executed we should hit a
|
|
segv, so it's almost as good as an illegal instruction (zero). */
|
|
|
|
static void
|
|
no_zero_padding (lang_statement_union_type *l)
|
|
{
|
|
if (l->header.type == lang_padding_statement_enum
|
|
&& l->padding_statement.size != 0
|
|
&& l->padding_statement.output_section != NULL
|
|
&& (l->padding_statement.output_section->flags & SEC_CODE) != 0
|
|
&& l->padding_statement.fill->size == 0)
|
|
{
|
|
struct _ppc_fill_type
|
|
{
|
|
size_t size;
|
|
unsigned char data[4];
|
|
};
|
|
static struct _ppc_fill_type fill_be = { 4, {0x48, 0, 0, 2} };
|
|
static struct _ppc_fill_type fill_le = { 4, {2, 0, 0, 0x48} };
|
|
|
|
if (bfd_big_endian (link_info.output_bfd))
|
|
l->padding_statement.fill = (struct _fill_type *) &fill_be;
|
|
else
|
|
l->padding_statement.fill = (struct _fill_type *) &fill_le;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ppc_finish (void)
|
|
{
|
|
if (params.ppc476_workaround)
|
|
lang_for_each_statement (no_zero_padding);
|
|
if (!ppc_finish_symbols (&link_info))
|
|
einfo (_("%X%P: ppc_finish_symbols problem %E\n"));
|
|
finish_default ();
|
|
}
|
|
|
|
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=${PARSE_AND_LIST_PROLOGUE}'
|
|
enum ppc32_opt
|
|
{
|
|
OPTION_NO_TLS_OPT = 321,
|
|
OPTION_NO_TLS_GET_ADDR_OPT,
|
|
OPTION_NEW_PLT,
|
|
OPTION_OLD_PLT,
|
|
OPTION_PLT_ALIGN,
|
|
OPTION_NO_PLT_ALIGN,
|
|
OPTION_NO_INLINE_OPT,
|
|
OPTION_OLD_GOT,
|
|
OPTION_STUBSYMS,
|
|
OPTION_NO_STUBSYMS,
|
|
OPTION_PPC476_WORKAROUND,
|
|
OPTION_NO_PPC476_WORKAROUND,
|
|
OPTION_NO_PICFIXUP,
|
|
OPTION_VLE_RELOC_FIXUP
|
|
};
|
|
'
|
|
|
|
PARSE_AND_LIST_LONGOPTS=${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 },'
|
|
if test -z "$VXWORKS_BASE_EM_FILE" ; then
|
|
PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
|
|
{ "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
|
|
{ "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
|
|
{ "plt-align", optional_argument, NULL, OPTION_PLT_ALIGN },
|
|
{ "no-plt-align", no_argument, NULL, OPTION_NO_PLT_ALIGN },
|
|
{ "no-inline-optimize", no_argument, NULL, OPTION_NO_INLINE_OPT },
|
|
{ "sdata-got", no_argument, NULL, OPTION_OLD_GOT },'
|
|
fi
|
|
PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
|
|
{ "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND },
|
|
{ "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND },
|
|
{ "no-pic-fixup", no_argument, NULL, OPTION_NO_PICFIXUP },
|
|
{ "vle-reloc-fixup", no_argument, NULL, OPTION_VLE_RELOC_FIXUP },
|
|
'
|
|
|
|
PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
|
|
fprintf (file, _("\
|
|
--emit-stub-syms Label linker stubs with a symbol\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--no-emit-stub-syms Don'\''t label linker stubs with a symbol\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--no-tls-optimize Don'\''t try to optimize TLS accesses\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call\n"
|
|
));'
|
|
if test -z "$VXWORKS_BASE_EM_FILE" ; then
|
|
PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
|
|
fprintf (file, _("\
|
|
--secure-plt Use new-style PLT if possible\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--bss-plt Force old-style BSS PLT\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--plt-align Align PLT call stubs to fit cache lines\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--no-plt-align Dont'\''t align individual PLT call stubs\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--no-inline-optimize Don'\''t convert inline PLT to direct calls\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--sdata-got Force GOT location just before .sdata\n"
|
|
));'
|
|
fi
|
|
PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
|
|
fprintf (file, _("\
|
|
--ppc476-workaround [=pagesize]\n\
|
|
Avoid a cache bug on ppc476\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--no-ppc476-workaround Disable workaround\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--no-pic-fixup Don'\''t edit non-pic to pic\n"
|
|
));
|
|
fprintf (file, _("\
|
|
--vle-reloc-fixup Correct old object file 16A/16D relocation\n"
|
|
));
|
|
'
|
|
|
|
PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
|
|
case OPTION_STUBSYMS:
|
|
params.emit_stub_syms = 1;
|
|
break;
|
|
|
|
case OPTION_NO_STUBSYMS:
|
|
params.emit_stub_syms = 0;
|
|
break;
|
|
|
|
case OPTION_NO_TLS_OPT:
|
|
notlsopt = 1;
|
|
break;
|
|
|
|
case OPTION_NO_TLS_GET_ADDR_OPT:
|
|
params.no_tls_get_addr_opt = 1;
|
|
break;
|
|
|
|
case OPTION_NEW_PLT:
|
|
params.plt_style = PLT_NEW;
|
|
break;
|
|
|
|
case OPTION_OLD_PLT:
|
|
params.plt_style = PLT_OLD;
|
|
break;
|
|
|
|
case OPTION_PLT_ALIGN:
|
|
if (optarg != NULL)
|
|
{
|
|
char *end;
|
|
unsigned long val = strtoul (optarg, &end, 0);
|
|
if (*end || val > 5)
|
|
einfo (_("%F%P: invalid --plt-align `%s'\''\n"), optarg);
|
|
params.plt_stub_align = val;
|
|
}
|
|
else
|
|
params.plt_stub_align = 5;
|
|
break;
|
|
|
|
case OPTION_NO_PLT_ALIGN:
|
|
params.plt_stub_align = 0;
|
|
break;
|
|
|
|
case OPTION_NO_INLINE_OPT:
|
|
no_inline_opt = 1;
|
|
break;
|
|
|
|
case OPTION_OLD_GOT:
|
|
old_got = 1;
|
|
break;
|
|
|
|
case OPTION_TRADITIONAL_FORMAT:
|
|
notlsopt = 1;
|
|
params.no_tls_get_addr_opt = 1;
|
|
return FALSE;
|
|
|
|
case OPTION_PPC476_WORKAROUND:
|
|
params.ppc476_workaround = 1;
|
|
if (optarg != NULL)
|
|
{
|
|
char *end;
|
|
params.pagesize = strtoul (optarg, &end, 0);
|
|
if (*end
|
|
|| (params.pagesize < 4096 && params.pagesize != 0)
|
|
|| params.pagesize != (params.pagesize & -params.pagesize))
|
|
einfo (_("%F%P: invalid pagesize `%s'\''\n"), optarg);
|
|
}
|
|
break;
|
|
|
|
case OPTION_NO_PPC476_WORKAROUND:
|
|
params.ppc476_workaround = 0;
|
|
break;
|
|
|
|
case OPTION_NO_PICFIXUP:
|
|
params.pic_fixup = -1;
|
|
break;
|
|
|
|
case OPTION_VLE_RELOC_FIXUP:
|
|
params.vle_reloc_fixup = 1;
|
|
break;
|
|
'
|
|
|
|
# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
|
|
#
|
|
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output
|
|
if test -z "$VXWORKS_BASE_EM_FILE" ; then
|
|
LDEMUL_AFTER_CHECK_RELOCS=ppc_after_check_relocs
|
|
fi
|
|
LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
|
|
LDEMUL_FINISH=ppc_finish
|