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binutils-gdb/ld/emultempl/nds32elf.em
Kuan-Lin Chen 1c8f6a4d1f NDS32: Code refactoring of relaxation. 
Refactor each relaxation pattern to raise the maintainability.
In origin, all patterns is analysed in nds32_elf_relax_section,
so it is hard to debug and maintain.  Therefore, we classify all
patterns into different functions in this patch.
Moreover, we adjust all optimizations into nds32_elf_relax_section
to take these optimizations in turn.  This can promise all relaxation
being done after calling gld${EMULATION_NAME}_after_allocation.
2014-09-16 13:08:00 +08:00

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# This shell script emits a C file. -*- C -*-
# Copyright (C) 2012-2014 Free Software Foundation, Inc.
# Contributed by Andes Technology Corporation.
#
# 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.
#
fragment <<EOF
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/nds32.h"
#include "bfd_stdint.h"
#include "elf32-nds32.h"
static int relax_fp_as_gp = 1; /* --mrelax-omit-fp */
static int eliminate_gc_relocs = 0; /* --meliminate-gc-relocs */
static FILE *sym_ld_script = NULL; /* --mgen-symbol-ld-script=<file> */
/* Disable if linking a dynamically linked executable. */
static int load_store_relax = 1;
static int target_optimize = 0; /* Switch optimization. */
static int relax_status = 0; /* Finished optimization. */
static int relax_round = 0; /* Going optimization. */
static FILE *ex9_export_file = NULL; /* --mexport-ex9=<file> */
static FILE *ex9_import_file = NULL; /* --mimport-ex9=<file> */
static int update_ex9_table = 0; /* --mupdate-ex9. */
static int ex9_limit = 511;
static bfd_boolean ex9_loop_aware = FALSE; /* Ignore ex9 if inside a loop. */
static bfd_boolean ifc_loop_aware = FALSE; /* Ignore ifc if inside a loop. */
/* Save the target options into output bfd to avoid using to many global
variables. Do this after the output has been created, but before
inputs are read. */
static void
nds32_elf_create_output_section_statements (void)
{
if (strstr (bfd_get_target (link_info.output_bfd), "nds32") == NULL)
{
/* Check the output target is nds32. */
einfo ("%F%X%P: error: Cannot change output format whilst "
"linking NDS32 binaries.\n");
return;
}
bfd_elf32_nds32_set_target_option (&link_info, relax_fp_as_gp,
eliminate_gc_relocs,
sym_ld_script,
load_store_relax,
target_optimize, relax_status, relax_round,
ex9_export_file, ex9_import_file,
update_ex9_table, ex9_limit,
ex9_loop_aware, ifc_loop_aware);
}
static void
nds32_elf_after_parse (void)
{
if (link_info.relocatable)
DISABLE_RELAXATION;
if (!RELAXATION_ENABLED)
{
target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
relax_fp_as_gp = 0;
}
if (ex9_import_file != NULL)
{
ex9_export_file = NULL;
target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
}
else
update_ex9_table = 0;
if (link_info.shared)
{
target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
}
after_parse_default ();
}
static void
nds32_elf_after_open (void)
{
unsigned int arch_ver = (unsigned int)-1;
unsigned int abi_ver = (unsigned int)-1;
bfd *abfd;
/* For now, make sure all object files are of the same architecture.
We may try to merge object files with different architecture together. */
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
{
if (arch_ver == (unsigned int)-1 && E_N1_ARCH != (elf_elfheader (abfd)->e_flags & EF_NDS_ARCH))
arch_ver = elf_elfheader (abfd)->e_flags & EF_NDS_ARCH ;
if (abi_ver == (unsigned int)-1)
{
/* Initialize ABI version, if not ABI0.
(OS uses empty file to create empty ELF with ABI0). */
if ((elf_elfheader (abfd)->e_flags & EF_NDS_ABI) != 0)
abi_ver = elf_elfheader (abfd)->e_flags & EF_NDS_ABI ;
}
else if ((elf_elfheader (abfd)->e_flags & EF_NDS_ABI) != 0
&& abi_ver != (elf_elfheader (abfd)->e_flags & EF_NDS_ABI))
{
/* Incompatible objects. */
einfo (_("%F%B: ABI version of object files mismatched\n"), abfd);
}
#if defined NDS32_EX9_EXT
/* Append .ex9.itable section in the last input object file. */
if (abfd->link_next == NULL && (target_optimize & NDS32_RELAX_EX9_ON))
{
asection *itable;
struct bfd_link_hash_entry *h;
itable = bfd_make_section_with_flags (abfd, ".ex9.itable",
SEC_CODE | SEC_ALLOC | SEC_LOAD
| SEC_HAS_CONTENTS | SEC_READONLY
| SEC_IN_MEMORY | SEC_KEEP);
if (itable)
{
itable->gc_mark = 1;
itable->alignment_power = 2;
itable->size = 0x1000;
itable->contents = bfd_zalloc (abfd, itable->size);
/* Add a symbol in the head of ex9.itable to objdump clearly. */
h = bfd_link_hash_lookup (link_info.hash, "_EX9_BASE_",
FALSE, FALSE, FALSE);
_bfd_generic_link_add_one_symbol
(&link_info, link_info.output_bfd, "_EX9_BASE_",
BSF_GLOBAL | BSF_WEAK, itable, 0, (const char *) NULL, FALSE,
get_elf_backend_data (link_info.output_bfd)->collect, &h);
}
}
#endif
}
/* Check object files if the target is dynamic linked executable
or shared object. */
if (elf_hash_table (&link_info)->dynamic_sections_created
|| link_info.shared || link_info.pie)
{
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
{
if (!(elf_elfheader (abfd)->e_flags & E_NDS32_HAS_PIC))
{
/* Non-PIC object file is used. */
if (link_info.shared || link_info.pie)
{
/* For PIE or shared object, all input must be PIC. */
einfo (_("%B: must use -fpic to compile this file "
"for shared object or PIE\n"), abfd);
}
else
{
/* Dynamic linked executable with SDA and non-PIC.
Turn off load/store relaxtion. */
/* TODO: This may support in the future. */
load_store_relax = 0 ;
relax_fp_as_gp = 0;
}
}
}
/* Turn off relax when building shared object or PIE
until we can support their relaxation. */
}
/* Call the standard elf routine. */
gld${EMULATION_NAME}_after_open ();
}
static void
nds32_elf_after_allocation (void)
{
if (target_optimize & NDS32_RELAX_EX9_ON
|| (ex9_import_file != NULL && update_ex9_table == 1))
{
/* Initialize ex9 hash table. */
if (!nds32_elf_ex9_init ())
return;
}
/* Call default after allocation callback.
1. This is where relaxation is done.
2. It calls gld${EMULATION_NAME}_map_segments to build ELF segment table.
3. Any relaxation requires relax being done must be called after it. */
gld${EMULATION_NAME}_after_allocation ();
}
EOF
# Define some shell vars to insert bits of code into the standard elf
# parse_args and list_options functions.
#
PARSE_AND_LIST_PROLOGUE='
#define OPTION_BASELINE 301
#define OPTION_ELIM_GC_RELOCS (OPTION_BASELINE + 1)
#define OPTION_FP_AS_GP (OPTION_BASELINE + 2)
#define OPTION_NO_FP_AS_GP (OPTION_BASELINE + 3)
#define OPTION_REDUCE_FP_UPDATE (OPTION_BASELINE + 4)
#define OPTION_NO_REDUCE_FP_UPDATE (OPTION_BASELINE + 5)
#define OPTION_EXPORT_SYMBOLS (OPTION_BASELINE + 6)
/* These are only available to ex9. */
#if defined NDS32_EX9_EXT
#define OPTION_EX9_BASELINE 320
#define OPTION_EX9_TABLE (OPTION_EX9_BASELINE + 1)
#define OPTION_NO_EX9_TABLE (OPTION_EX9_BASELINE + 2)
#define OPTION_EXPORT_EX9 (OPTION_EX9_BASELINE + 3)
#define OPTION_IMPORT_EX9 (OPTION_EX9_BASELINE + 4)
#define OPTION_UPDATE_EX9 (OPTION_EX9_BASELINE + 5)
#define OPTION_EX9_LIMIT (OPTION_EX9_BASELINE + 6)
#define OPTION_EX9_LOOP (OPTION_EX9_BASELINE + 7)
#endif
/* These are only available to link-time ifc. */
#if defined NDS32_IFC_EXT
#define OPTION_IFC_BASELINE 340
#define OPTION_JUMP_IFC (OPTION_IFC_BASELINE + 1)
#define OPTION_NO_JUMP_IFC (OPTION_IFC_BASELINE + 2)
#define OPTION_IFC_LOOP (OPTION_IFC_BASELINE + 3)
#endif
'
PARSE_AND_LIST_LONGOPTS='
{ "mfp-as-gp", no_argument, NULL, OPTION_FP_AS_GP},
{ "mno-fp-as-gp", no_argument, NULL, OPTION_NO_FP_AS_GP},
{ "mexport-symbols", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
/* These are deprecated options. Remove them in the future. */
{ "mrelax-reduce-fp-update", no_argument, NULL, OPTION_REDUCE_FP_UPDATE},
{ "mrelax-no-reduce-fp-update", no_argument, NULL, OPTION_NO_REDUCE_FP_UPDATE},
{ "mbaseline", required_argument, NULL, OPTION_BASELINE},
{ "meliminate-gc-relocs", no_argument, NULL, OPTION_ELIM_GC_RELOCS},
{ "mrelax-omit-fp", no_argument, NULL, OPTION_FP_AS_GP},
{ "mrelax-no-omit-fp", no_argument, NULL, OPTION_NO_FP_AS_GP},
{ "mgen-symbol-ld-script", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
/* These are specific optioins for ex9-ext support. */
#if defined NDS32_EX9_EXT
{ "mex9", no_argument, NULL, OPTION_EX9_TABLE},
{ "mno-ex9", no_argument, NULL, OPTION_NO_EX9_TABLE},
{ "mexport-ex9", required_argument, NULL, OPTION_EXPORT_EX9},
{ "mimport-ex9", required_argument, NULL, OPTION_IMPORT_EX9},
{ "mupdate-ex9", no_argument, NULL, OPTION_UPDATE_EX9},
{ "mex9-limit", required_argument, NULL, OPTION_EX9_LIMIT},
{ "mex9-loop-aware", no_argument, NULL, OPTION_EX9_LOOP},
#endif
/* These are specific optioins for ifc-ext support. */
#if defined NDS32_IFC_EXT
{ "mifc", no_argument, NULL, OPTION_JUMP_IFC},
{ "mno-ifc", no_argument, NULL, OPTION_NO_JUMP_IFC},
{ "mifc-loop-aware", no_argument, NULL, OPTION_IFC_LOOP},
#endif
'
PARSE_AND_LIST_OPTIONS='
fprintf (file, _("\
--m[no-]fp-as-gp Disable/enable fp-as-gp relaxation\n\
--mexport-symbols=FILE Exporting symbols in linker script\n\
"));
#if defined NDS32_EX9_EXT
fprintf (file, _("\
--m[no-]ex9 Disable/enable link-time EX9 relaxation\n\
--mexport-ex9=FILE Export EX9 table after linking\n\
--mimport-ex9=FILE Import Ex9 table for EX9 relaxation\n\
--mupdate-ex9 Update existing EX9 table\n\
--mex9-limit=NUM Maximum number of entries in ex9 table\n\
--mex9-loop-aware Avoid generate EX9 instruction inside loop\n\
"));
#endif
#if defined NDS32_IFC_EXT
fprintf (file, _("\
--m[no-]ifc Disable/enable link-time IFC optimization\n\
--mifc-loop-aware Avoid generate IFC instruction inside loop\n\
"));
#endif
'
PARSE_AND_LIST_ARGS_CASES='
case OPTION_BASELINE:
einfo ("%P: --mbaseline is not used anymore.\n");
break;
case OPTION_ELIM_GC_RELOCS:
eliminate_gc_relocs = 1;
break;
case OPTION_FP_AS_GP:
case OPTION_NO_FP_AS_GP:
relax_fp_as_gp = (optc == OPTION_FP_AS_GP);
break;
case OPTION_REDUCE_FP_UPDATE:
case OPTION_NO_REDUCE_FP_UPDATE:
einfo ("%P: --relax-[no-]reduce-fp-updat is not used anymore.\n");
break;
case OPTION_EXPORT_SYMBOLS:
if (!optarg)
einfo (_("Missing file for --mexport-symbols.\n"), optarg);
if(strcmp (optarg, "-") == 0)
sym_ld_script = stdout;
else
{
sym_ld_script = fopen (optarg, FOPEN_WT);
if(sym_ld_script == NULL)
einfo (_("%P%F: cannot open map file %s: %E.\n"), optarg);
}
break;
#if defined NDS32_EX9_EXT
case OPTION_EX9_TABLE:
target_optimize = target_optimize | NDS32_RELAX_EX9_ON;
break;
case OPTION_NO_EX9_TABLE:
target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
break;
case OPTION_EXPORT_EX9:
if (!optarg)
einfo (_("Missing file for --mexport-ex9=<file>.\n"));
if(strcmp (optarg, "-") == 0)
ex9_export_file = stdout;
else
{
ex9_export_file = fopen (optarg, "wb");
if(ex9_export_file == NULL)
einfo (_("ERROR %P%F: cannot open ex9 export file %s.\n"), optarg);
}
break;
case OPTION_IMPORT_EX9:
if (!optarg)
einfo (_("Missing file for --mimport-ex9=<file>.\n"));
ex9_import_file = fopen (optarg, "rb+");
if(ex9_import_file == NULL)
einfo (_("ERROR %P%F: cannot open ex9 import file %s.\n"), optarg);
break;
case OPTION_UPDATE_EX9:
update_ex9_table = 1;
break;
case OPTION_EX9_LIMIT:
if (optarg)
{
ex9_limit = atoi (optarg);
if (ex9_limit > 511 || ex9_limit < 1)
{
einfo (_("ERROR: the range of ex9_limit must between 1 and 511\n"));
exit (1);
}
}
break;
case OPTION_EX9_LOOP:
target_optimize = target_optimize | NDS32_RELAX_EX9_ON;
ex9_loop_aware = 1;
break;
#endif
#if defined NDS32_IFC_EXT
case OPTION_JUMP_IFC:
target_optimize = target_optimize | NDS32_RELAX_JUMP_IFC_ON;
break;
case OPTION_NO_JUMP_IFC:
target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
break;
case OPTION_IFC_LOOP:
target_optimize = target_optimize | NDS32_RELAX_JUMP_IFC_ON;
ifc_loop_aware = 1;
break;
#endif
'
LDEMUL_AFTER_OPEN=nds32_elf_after_open
LDEMUL_AFTER_PARSE=nds32_elf_after_parse
LDEMUL_AFTER_ALLOCATION=nds32_elf_after_allocation
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nds32_elf_create_output_section_statements
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