266 lines
8.0 KiB
Plaintext
266 lines
8.0 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
|
|
# Copyright 2006, 2007, 2008, 2009
|
|
# 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 avr-elf specific
|
|
# routines. It is used to generate the trampolines for the avr6 family
|
|
# of devices where one needs to address the issue that it is not possible
|
|
# to reach the whole program memory by using 16 bit pointers.
|
|
|
|
fragment <<EOF
|
|
|
|
#include "elf32-avr.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 *avr_stub_section;
|
|
|
|
/* Variables set by the command-line parameters and transfered
|
|
to the bfd without use of global shared variables. */
|
|
|
|
static bfd_boolean avr_no_stubs = FALSE;
|
|
static bfd_boolean avr_debug_relax = FALSE;
|
|
static bfd_boolean avr_debug_stubs = FALSE;
|
|
static bfd_boolean avr_replace_call_ret_sequences = TRUE;
|
|
static bfd_vma avr_pc_wrap_around = 0x10000000;
|
|
|
|
/* Transfers information to the bfd frontend. */
|
|
|
|
static void
|
|
avr_elf_set_global_bfd_parameters (void)
|
|
{
|
|
elf32_avr_setup_params (& link_info,
|
|
stub_file->the_bfd,
|
|
avr_stub_section,
|
|
avr_no_stubs,
|
|
avr_debug_stubs,
|
|
avr_debug_relax,
|
|
avr_pc_wrap_around,
|
|
avr_replace_call_ret_sequences);
|
|
}
|
|
|
|
|
|
/* Makes a conservative estimate of the trampoline section size that could
|
|
be corrected later on. */
|
|
|
|
static void
|
|
avr_elf_${EMULATION_NAME}_before_allocation (void)
|
|
{
|
|
int ret;
|
|
|
|
gld${EMULATION_NAME}_before_allocation ();
|
|
|
|
/* We only need stubs for the avr6 family. */
|
|
if (strcmp ("${EMULATION_NAME}","avr6"))
|
|
avr_no_stubs = TRUE;
|
|
|
|
avr_elf_set_global_bfd_parameters ();
|
|
|
|
/* If generating a relocatable output file, then
|
|
we don't have to generate the trampolines. */
|
|
if (link_info.relocatable)
|
|
avr_no_stubs = TRUE;
|
|
|
|
if (avr_no_stubs)
|
|
return;
|
|
|
|
ret = elf32_avr_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_avr_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
|
|
avr_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);
|
|
avr_stub_section = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
|
|
".trampolines",
|
|
flags);
|
|
if (avr_stub_section == NULL)
|
|
goto err_ret;
|
|
|
|
avr_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
|
|
avr_elf_after_allocation (void)
|
|
{
|
|
if (!avr_no_stubs && ! RELAXATION_ENABLED)
|
|
{
|
|
/* If relaxing, elf32_avr_size_stubs will be called from
|
|
elf32_avr_relax_section. */
|
|
if (!elf32_avr_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 (!avr_no_stubs)
|
|
{
|
|
if (!elf32_avr_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, _(" --pmem-wrap-around=<val> "
|
|
"Make the linker relaxation machine assume that a\n"
|
|
" "
|
|
" program counter wrap-around occures at address\n"
|
|
" "
|
|
" <val>. Supported values: 8k, 16k, 32k and 64k.\n"));
|
|
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, _(" --no-stubs "
|
|
"If the linker detects to attempt to access\n"
|
|
" "
|
|
" an instruction beyond 128k by a reloc that\n"
|
|
" "
|
|
" is limited to 128k max, it inserts a jump\n"
|
|
" "
|
|
" stub. You can de-active this with this switch.\n"));
|
|
fprintf (file, _(" --debug-stubs "
|
|
"Used for debugging avr-ld.\n"));
|
|
fprintf (file, _(" --debug-relax "
|
|
"Used for debugging avr-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")))
|
|
avr_pc_wrap_around = 32768;
|
|
else if ((!strcmp (optarg,"8k")) || (!strcmp (optarg,"8K")))
|
|
avr_pc_wrap_around = 8192;
|
|
else if ((!strcmp (optarg,"16k")) || (!strcmp (optarg,"16K")))
|
|
avr_pc_wrap_around = 16384;
|
|
else if ((!strcmp (optarg,"64k")) || (!strcmp (optarg,"64K")))
|
|
avr_pc_wrap_around = 0x10000;
|
|
else
|
|
return FALSE;
|
|
}
|
|
break;
|
|
|
|
case OPTION_DEBUG_STUBS:
|
|
avr_debug_stubs = TRUE;
|
|
break;
|
|
|
|
case OPTION_DEBUG_RELAX:
|
|
avr_debug_relax = TRUE;
|
|
break;
|
|
|
|
case OPTION_NO_STUBS:
|
|
avr_no_stubs = TRUE;
|
|
break;
|
|
|
|
case OPTION_NO_CALL_RET_REPLACEMENT:
|
|
{
|
|
/* This variable is defined in the bfd library. */
|
|
avr_replace_call_ret_sequences = FALSE;
|
|
}
|
|
break;
|
|
'
|
|
|
|
#
|
|
# Put these extra avr-elf routines in ld_${EMULATION_NAME}_emulation
|
|
#
|
|
LDEMUL_BEFORE_ALLOCATION=avr_elf_${EMULATION_NAME}_before_allocation
|
|
LDEMUL_AFTER_ALLOCATION=avr_elf_after_allocation
|
|
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=avr_elf_create_output_section_statements
|