ld/emultempl/nds32elf.em

   1 # This shell script emits a C file. -*- C -*-
   2 # Copyright (C) 2012-2021 Free Software Foundation, Inc.
   3 # Contributed by Andes Technology Corporation.
   4 #
   5 # This file is part of the GNU Binutils.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20 # MA 02110-1301, USA.
  21 #
  22
  23 fragment <<EOF
  24
  25 #include "elf-bfd.h"
  26 #include "elf/nds32.h"
  27 #include "bfd_stdint.h"
  28 #include "elf32-nds32.h"
  29
  30 static int relax_fp_as_gp = 1;          /* --mrelax-omit-fp  */
  31 static int eliminate_gc_relocs = 0;     /* --meliminate-gc-relocs  */
  32 static FILE *sym_ld_script = NULL;      /* --mgen-symbol-ld-script=<file>  */
  33 static int hyper_relax = 1;             /* --mhyper-relax  */
  34 static int tls_desc_trampoline = 0;     /* --m[no]tlsdesc-trampoline.  */
  35 /* Disable if linking a dynamically linked executable.  */
  36 static int load_store_relax = 1;
  37
  38 /* Save the target options into output bfd to avoid using to many global
  39    variables. Do this after the output has been created, but before
  40    inputs are read.  */
  41 static void
  42 nds32_elf_create_output_section_statements (void)
  43 {
  44   if (strstr (bfd_get_target (link_info.output_bfd), "nds32") == NULL)
  45     {
  46       /* Check the output target is nds32.  */
  47       einfo (_("%F%P: error: cannot change output format whilst "
  48                "linking %s binaries\n"), "NDS32");
  49       return;
  50     }
  51
  52   bfd_elf32_nds32_set_target_option (&link_info,
  53                                      relax_fp_as_gp,
  54                                      eliminate_gc_relocs,
  55                                      sym_ld_script,
  56                                      hyper_relax,
  57                                      tls_desc_trampoline,
  58                                      load_store_relax);
  59 }
  60
  61 static void
  62 nds32_elf_after_parse (void)
  63 {
  64   if (bfd_link_relocatable (&link_info)
  65       || bfd_link_pic (&link_info))
  66     DISABLE_RELAXATION;
  67
  68   if (!RELAXATION_ENABLED)
  69     relax_fp_as_gp = 0;
  70
  71   ldelf_after_parse ();
  72 }
  73
  74 static void
  75 nds32_elf_after_open (void)
  76 {
  77   unsigned int arch_ver = (unsigned int)-1;
  78   unsigned int abi_ver = (unsigned int)-1;
  79   bfd *abfd;
  80
  81   /* For now, make sure all object files are of the same architecture.
  82      We may try to merge object files with different architecture together.  */
  83   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
  84     {
  85       if (arch_ver == (unsigned int)-1 && E_N1_ARCH != (elf_elfheader (abfd)->e_flags & EF_NDS_ARCH))
  86         arch_ver = elf_elfheader (abfd)->e_flags & EF_NDS_ARCH ;
  87
  88       if (abi_ver == (unsigned int)-1)
  89         {
  90           /* Initialize ABI version, if not ABI0.
  91              (OS uses empty file to create empty ELF with ABI0).  */
  92           if ((elf_elfheader (abfd)->e_flags & EF_NDS_ABI) != 0)
  93             abi_ver = elf_elfheader (abfd)->e_flags & EF_NDS_ABI ;
  94         }
  95       else if ((elf_elfheader (abfd)->e_flags & EF_NDS_ABI) != 0
  96                && abi_ver != (elf_elfheader (abfd)->e_flags & EF_NDS_ABI))
  97         {
  98           /* Incompatible objects.  */
  99           einfo (_("%F%P: %pB: ABI version of object files mismatched\n"),
 100                  abfd);
 101         }
 102     }
 103
 104   /* Check object files if the target is dynamic linked executable
 105      or shared object.  */
 106   if (elf_hash_table (&link_info)->dynamic_sections_created
 107       || bfd_link_pic (&link_info)
 108       || bfd_link_pie (&link_info))
 109     {
 110       /* Dynamic linked executable with SDA and non-PIC.
 111          Turn off load/store relaxtion.  */
 112       /* This may support in the future.  */
 113       load_store_relax = 0 ;
 114       relax_fp_as_gp = 0;
 115     }
 116
 117   /* Call the standard elf routine.  */
 118   gld${EMULATION_NAME}_after_open ();
 119 }
 120
 121 static void
 122 nds32_elf_after_allocation (void)
 123 {
 124   /* Call default after allocation callback.
 125      1. This is where relaxation is done.
 126      2. It calls ldelf_map_segments to build ELF segment table.
 127      3. Any relaxation requires relax being done must be called after it.  */
 128   gld${EMULATION_NAME}_after_allocation ();
 129 }
 130
 131 EOF
 132 # Define some shell vars to insert bits of code into the standard elf
 133 # parse_args and list_options functions.
 134 #
 135 PARSE_AND_LIST_PROLOGUE='
 136 #define OPTION_BASELINE                 301
 137 #define OPTION_ELIM_GC_RELOCS           (OPTION_BASELINE + 1)
 138 #define OPTION_FP_AS_GP                 (OPTION_BASELINE + 2)
 139 #define OPTION_NO_FP_AS_GP              (OPTION_BASELINE + 3)
 140 #define OPTION_REDUCE_FP_UPDATE         (OPTION_BASELINE + 4)
 141 #define OPTION_NO_REDUCE_FP_UPDATE      (OPTION_BASELINE + 5)
 142 #define OPTION_EXPORT_SYMBOLS           (OPTION_BASELINE + 6)
 143 #define OPTION_HYPER_RELAX              (OPTION_BASELINE + 7)
 144 #define OPTION_TLSDESC_TRAMPOLINE       (OPTION_BASELINE + 8)
 145 #define OPTION_NO_TLSDESC_TRAMPOLINE    (OPTION_BASELINE + 9)
 146 '
 147 PARSE_AND_LIST_LONGOPTS='
 148   { "mfp-as-gp", no_argument, NULL, OPTION_FP_AS_GP},
 149   { "mno-fp-as-gp", no_argument, NULL, OPTION_NO_FP_AS_GP},
 150   { "mexport-symbols", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
 151   { "mhyper-relax", required_argument, NULL, OPTION_HYPER_RELAX},
 152   { "mtlsdesc-trampoline", no_argument, NULL, OPTION_TLSDESC_TRAMPOLINE},
 153   { "mno-tlsdesc-trampoline", no_argument, NULL, OPTION_NO_TLSDESC_TRAMPOLINE},
 154   /* These are deprecated options.  Remove them in the future.  */
 155   { "mrelax-reduce-fp-update", no_argument, NULL, OPTION_REDUCE_FP_UPDATE},
 156   { "mrelax-no-reduce-fp-update", no_argument, NULL, OPTION_NO_REDUCE_FP_UPDATE},
 157   { "mbaseline", required_argument, NULL, OPTION_BASELINE},
 158   { "meliminate-gc-relocs", no_argument, NULL, OPTION_ELIM_GC_RELOCS},
 159   { "mrelax-omit-fp", no_argument, NULL, OPTION_FP_AS_GP},
 160   { "mrelax-no-omit-fp", no_argument, NULL, OPTION_NO_FP_AS_GP},
 161   { "mgen-symbol-ld-script", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
 162 '
 163 PARSE_AND_LIST_OPTIONS='
 164   fprintf (file, _("\
 165   --m[no-]fp-as-gp            Disable/enable fp-as-gp relaxation\n"));
 166   fprintf (file, _("\
 167   --mexport-symbols=FILE      Exporting symbols in linker script\n"));
 168   fprintf (file, _("\
 169   --mhyper-relax=level        Adjust relax level (low|medium|high). default: medium\n"));
 170   fprintf (file, _("\
 171   --m[no-]tlsdesc-trampoline  Disable/enable TLS DESC trampoline\n"));
 172 '
 173 PARSE_AND_LIST_ARGS_CASES='
 174   case OPTION_BASELINE:
 175     einfo (_("%P: --mbaseline is not used anymore\n"));
 176     break;
 177   case OPTION_ELIM_GC_RELOCS:
 178     eliminate_gc_relocs = 1;
 179     break;
 180   case OPTION_FP_AS_GP:
 181   case OPTION_NO_FP_AS_GP:
 182     relax_fp_as_gp = (optc == OPTION_FP_AS_GP);
 183     break;
 184   case OPTION_REDUCE_FP_UPDATE:
 185   case OPTION_NO_REDUCE_FP_UPDATE:
 186     einfo (_("%P: --relax-[no-]reduce-fp-updat is not used anymore\n"));
 187     break;
 188   case OPTION_EXPORT_SYMBOLS:
 189     if (!optarg)
 190       einfo (_("%P: missing file for --mexport-symbols\n"), optarg);
 191
 192     if(strcmp (optarg, "-") == 0)
 193       sym_ld_script = stdout;
 194     else
 195       {
 196         sym_ld_script = fopen (optarg, FOPEN_WT);
 197         if(sym_ld_script == NULL)
 198           einfo (_("%F%P: cannot open map file %s: %E\n"), optarg);
 199       }
 200     break;
 201   case OPTION_HYPER_RELAX:
 202     if (!optarg)
 203       einfo (_("%P: valid arguments to --mhyper-relax=(low|medium|high)\n"));
 204
 205     if (strcmp (optarg, "low") == 0)
 206       hyper_relax = 0;
 207     else if (strcmp (optarg, "medium") == 0)
 208       hyper_relax = 1;
 209     else if (strcmp (optarg, "high") == 0)
 210       hyper_relax = 2;
 211     else
 212       einfo (_("%P: valid arguments to --mhyper-relax=(low|medium|high)\n"));
 213
 214     break;
 215   case OPTION_TLSDESC_TRAMPOLINE:
 216     tls_desc_trampoline = 1;
 217     break;
 218   case OPTION_NO_TLSDESC_TRAMPOLINE:
 219     tls_desc_trampoline = 0;
 220      break;
 221 '
 222 LDEMUL_AFTER_OPEN=nds32_elf_after_open
 223 LDEMUL_AFTER_PARSE=nds32_elf_after_parse
 224 LDEMUL_AFTER_ALLOCATION=nds32_elf_after_allocation
 225 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nds32_elf_create_output_section_statements