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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [ld/] [emultempl/] [open8elf.em] - Rev 328
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# This shell script emits a C file. -*- C -*-
# Copyright 2006, 2007, 2008, 2009, 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 open8-elf specific
# routines.
fragment <<EOF
#include "elf32-open8.h"
#include "ldctor.h"
/* The fake file and it's corresponding section meant to hold
the linker stubs if needed. */
static lang_input_statement_type *stub_file;
static asection *open8_stub_section;
/* Variables set by the command-line parameters and transfered
to the bfd without use of global shared variables. */
static bfd_boolean open8_no_stubs = FALSE;
static bfd_boolean open8_debug_relax = FALSE;
static bfd_boolean open8_debug_stubs = FALSE;
static bfd_boolean open8_replace_call_ret_sequences = TRUE;
static bfd_vma open8_pc_wrap_around = 0x10000000;
/* Transfers information to the bfd frontend. */
static void
open8_elf_set_global_bfd_parameters (void)
{
elf32_open8_setup_params (& link_info,
stub_file->the_bfd,
open8_stub_section,
open8_no_stubs,
open8_debug_stubs,
open8_debug_relax,
open8_pc_wrap_around,
open8_replace_call_ret_sequences);
}
/* Makes a conservative estimate of the trampoline section size that could
be corrected later on. */
static void
open8_elf_${EMULATION_NAME}_before_allocation (void)
{
int ret;
gld${EMULATION_NAME}_before_allocation ();
/* No stubs support for the Open8 at this time. */
open8_no_stubs = TRUE;
open8_elf_set_global_bfd_parameters ();
/* If generating a relocatable output file, then
we don't have to generate the trampolines. */
if (link_info.relocatable)
open8_no_stubs = TRUE;
if (open8_no_stubs)
return;
ret = elf32_open8_setup_section_lists (link_info.output_bfd, &link_info);
if (ret < 0)
einfo ("%X%P: can not setup the input section list: %E\n");
if (ret <= 0)
return;
/* Call into the BFD backend to do the real "stub"-work. */
if (! elf32_open8_size_stubs (link_info.output_bfd, &link_info, TRUE))
einfo ("%X%P: can not size stub section: %E\n");
}
/* This is called before the input files are opened. We create a new
fake input file to hold the stub section and generate the section itself. */
static void
open8_elf_create_output_section_statements (void)
{
flagword flags;
stub_file = lang_add_input_file ("linker stubs",
lang_input_file_is_fake_enum,
NULL);
stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
if (stub_file->the_bfd == NULL
|| !bfd_set_arch_mach (stub_file->the_bfd,
bfd_get_arch (link_info.output_bfd),
bfd_get_mach (link_info.output_bfd)))
{
einfo ("%X%P: can not create stub BFD %E\n");
return;
}
/* Now we add the stub section. */
flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
| SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
open8_stub_section = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
".trampolines",
flags);
if (open8_stub_section == NULL)
goto err_ret;
open8_stub_section->alignment_power = 1;
ldlang_add_file (stub_file);
return;
err_ret:
einfo ("%X%P: can not make stub section: %E\n");
return;
}
/* Re-calculates the size of the stubs so that we won't waste space. */
static void
open8_elf_after_allocation (void)
{
if (!open8_no_stubs && ! RELAXATION_ENABLED)
{
/* If relaxing, elf32_open8_size_stubs will be called from
elf32_open8_relax_section. */
if (!elf32_open8_size_stubs (link_info.output_bfd, &link_info, FALSE))
einfo ("%X%P: can not size stub section: %E\n");
}
gld${EMULATION_NAME}_after_allocation ();
/* Now build the linker stubs. */
if (!open8_no_stubs)
{
if (!elf32_open8_build_stubs (&link_info))
einfo ("%X%P: can not build stubs: %E\n");
}
}
EOF
PARSE_AND_LIST_PROLOGUE='
#define OPTION_NO_CALL_RET_REPLACEMENT 301
#define OPTION_PMEM_WRAP_AROUND 302
#define OPTION_NO_STUBS 303
#define OPTION_DEBUG_STUBS 304
#define OPTION_DEBUG_RELAX 305
'
PARSE_AND_LIST_LONGOPTS='
{ "no-call-ret-replacement", no_argument,
NULL, OPTION_NO_CALL_RET_REPLACEMENT},
{ "pmem-wrap-around", required_argument,
NULL, OPTION_PMEM_WRAP_AROUND},
{ "no-stubs", no_argument,
NULL, OPTION_NO_STUBS},
{ "debug-stubs", no_argument,
NULL, OPTION_DEBUG_STUBS},
{ "debug-relax", no_argument,
NULL, OPTION_DEBUG_RELAX},
'
PARSE_AND_LIST_OPTIONS='
fprintf (file, _(" --no-call-ret-replacement "
"The relaxation machine normally will\n"
" "
" substitute two immediately following call/ret\n"
" "
" instructions by a single jump instruction.\n"
" "
" This option disables this optimization.\n"));
fprintf (file, _(" --debug-stubs "
"Used for debugging open8-ld.\n"));
fprintf (file, _(" --debug-relax "
"Used for debugging open8-ld.\n"));
'
PARSE_AND_LIST_ARGS_CASES='
case OPTION_PMEM_WRAP_AROUND:
{
/* This variable is defined in the bfd library. */
if ((!strcmp (optarg,"32k")) || (!strcmp (optarg,"32K")))
open8_pc_wrap_around = 32768;
else if ((!strcmp (optarg,"8k")) || (!strcmp (optarg,"8K")))
open8_pc_wrap_around = 8192;
else if ((!strcmp (optarg,"16k")) || (!strcmp (optarg,"16K")))
open8_pc_wrap_around = 16384;
else if ((!strcmp (optarg,"64k")) || (!strcmp (optarg,"64K")))
open8_pc_wrap_around = 0x10000;
else
return FALSE;
}
break;
case OPTION_DEBUG_STUBS:
open8_debug_stubs = TRUE;
break;
case OPTION_DEBUG_RELAX:
open8_debug_relax = TRUE;
break;
case OPTION_NO_STUBS:
open8_no_stubs = TRUE;
break;
case OPTION_NO_CALL_RET_REPLACEMENT:
{
/* This variable is defined in the bfd library. */
open8_replace_call_ret_sequences = FALSE;
}
break;
'
#
# Put these extra open8-elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_BEFORE_ALLOCATION=open8_elf_${EMULATION_NAME}_before_allocation
LDEMUL_AFTER_ALLOCATION=open8_elf_after_allocation
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=\
open8_elf_create_output_section_statements
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