ld/emultempl/m68kcoff.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* Handle embedded relocs for m68k.
   7    Copyright 2000, 2002, 2003 Free Software Foundation, Inc.
   8    Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on generic.em
   9    by Steve Chamberlain <steve@cygnus.com>, embedded relocs code based on
  10    mipsecoff.em by Ian Lance Taylor <ian@cygnus.com>.
  11
  12 This file is part of GLD, the Gnu Linker.
  13
  14 This program is free software; you can redistribute it and/or modify
  15 it under the terms of the GNU General Public License as published by
  16 the Free Software Foundation; either version 2 of the License, or
  17 (at your option) any later version.
  18
  19 This program is distributed in the hope that it will be useful,
  20 but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 GNU General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with this program; if not, write to the Free Software
  26 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  27
  28 #define TARGET_IS_${EMULATION_NAME}
  29
  30 #include "bfd.h"
  31 #include "sysdep.h"
  32 #include "bfdlink.h"
  33
  34 #include "ld.h"
  35 #include "ldmain.h"
  36 #include "ldfile.h"
  37 #include "ldemul.h"
  38 #include "ldmisc.h"
  39
  40 static void check_sections (bfd *, asection *, void *);
  41
  42 static void
  43 gld${EMULATION_NAME}_before_parse (void)
  44 {
  45 #ifndef TARGET_                 /* I.e., if not generic.  */
  46   ldfile_set_output_arch ("`echo ${ARCH}`");
  47 #endif /* not TARGET_ */
  48 }
  49
  50 /* This function is run after all the input files have been opened.
  51    We create a .emreloc section for each input file with a non zero
  52    .data section.  The BFD backend will fill in these sections with
  53    magic numbers which can be used to relocate the data section at run
  54    time.  */
  55
  56 static void
  57 gld${EMULATION_NAME}_after_open (void)
  58 {
  59   bfd *abfd;
  60
  61   if (! command_line.embedded_relocs
  62       || link_info.relocatable)
  63     return;
  64
  65   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  66     {
  67       asection *datasec;
  68
  69       /* As first-order business, make sure that each input BFD is COFF. It
  70          better be, as we are directly calling a COFF backend function.  */
  71       if (bfd_get_flavour (abfd) != bfd_target_coff_flavour)
  72         einfo ("%F%B: all input objects must be COFF for --embedded-relocs\n");
  73
  74       datasec = bfd_get_section_by_name (abfd, ".data");
  75
  76       /* Note that we assume that the reloc_count field has already
  77          been set up.  We could call bfd_get_reloc_upper_bound, but
  78          that returns the size of a memory buffer rather than a reloc
  79          count.  We do not want to call bfd_canonicalize_reloc,
  80          because although it would always work it would force us to
  81          read in the relocs into BFD canonical form, which would waste
  82          a significant amount of time and memory.  */
  83       if (datasec != NULL && datasec->reloc_count > 0)
  84         {
  85           asection *relsec;
  86
  87           relsec = bfd_make_section (abfd, ".emreloc");
  88           if (relsec == NULL
  89               || ! bfd_set_section_flags (abfd, relsec,
  90                                           (SEC_ALLOC
  91                                            | SEC_LOAD
  92                                            | SEC_HAS_CONTENTS
  93                                            | SEC_IN_MEMORY))
  94               || ! bfd_set_section_alignment (abfd, relsec, 2)
  95               || ! bfd_set_section_size (abfd, relsec,
  96                                          datasec->reloc_count * 12))
  97             einfo ("%F%B: can not create .emreloc section: %E\n");
  98         }
  99
 100       /* Double check that all other data sections are empty, as is
 101          required for embedded PIC code.  */
 102       bfd_map_over_sections (abfd, check_sections, datasec);
 103     }
 104 }
 105
 106 /* Check that of the data sections, only the .data section has
 107    relocs.  This is called via bfd_map_over_sections.  */
 108
 109 static void
 110 check_sections (bfd *abfd, asection *sec, void *datasec)
 111 {
 112   if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
 113       && sec != datasec
 114       && sec->reloc_count != 0)
 115     einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
 116            abfd, bfd_get_section_name (abfd, sec));
 117 }
 118
 119 /* This function is called after the section sizes and offsets have
 120    been set.  If we are generating embedded relocs, it calls a special
 121    BFD backend routine to do the work.  */
 122
 123 static void
 124 gld${EMULATION_NAME}_after_allocation (void)
 125 {
 126   bfd *abfd;
 127
 128   if (! command_line.embedded_relocs
 129       || link_info.relocatable)
 130     return;
 131
 132   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 133     {
 134       asection *datasec, *relsec;
 135       char *errmsg;
 136
 137       datasec = bfd_get_section_by_name (abfd, ".data");
 138
 139       if (datasec == NULL || datasec->reloc_count == 0)
 140         continue;
 141
 142       relsec = bfd_get_section_by_name (abfd, ".emreloc");
 143       ASSERT (relsec != NULL);
 144
 145       if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info,
 146                                                    datasec, relsec,
 147                                                    &errmsg))
 148         {
 149           if (errmsg == NULL)
 150             einfo ("%B%X: can not create runtime reloc information: %E\n",
 151                    abfd);
 152           else
 153             einfo ("%X%B: can not create runtime reloc information: %s\n",
 154                    abfd, errmsg);
 155         }
 156     }
 157 }
 158
 159 static char *
 160 gld${EMULATION_NAME}_get_script (int *isfile)
 161 EOF
 162
 163 if test -n "$COMPILE_IN"
 164 then
 165 # Scripts compiled in.
 166
 167 # sed commands to quote an ld script as a C string.
 168 sc="-f stringify.sed"
 169
 170 cat >>e${EMULATION_NAME}.c <<EOF
 171 {
 172   *isfile = 0;
 173
 174   if (link_info.relocatable && config.build_constructors)
 175     return
 176 EOF
 177 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 178 echo '  ; else if (link_info.relocatable) return'     >> e${EMULATION_NAME}.c
 179 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 180 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 181 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 182 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 183 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 184 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 185 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 186 echo '; }'                                             >> e${EMULATION_NAME}.c
 187
 188 else
 189 # Scripts read from the filesystem.
 190
 191 cat >>e${EMULATION_NAME}.c <<EOF
 192 {
 193   *isfile = 1;
 194
 195   if (link_info.relocatable && config.build_constructors)
 196     return "ldscripts/${EMULATION_NAME}.xu";
 197   else if (link_info.relocatable)
 198     return "ldscripts/${EMULATION_NAME}.xr";
 199   else if (!config.text_read_only)
 200     return "ldscripts/${EMULATION_NAME}.xbn";
 201   else if (!config.magic_demand_paged)
 202     return "ldscripts/${EMULATION_NAME}.xn";
 203   else
 204     return "ldscripts/${EMULATION_NAME}.x";
 205 }
 206 EOF
 207
 208 fi
 209
 210 cat >>e${EMULATION_NAME}.c <<EOF
 211
 212 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 213 {
 214   gld${EMULATION_NAME}_before_parse,
 215   syslib_default,
 216   hll_default,
 217   after_parse_default,
 218   gld${EMULATION_NAME}_after_open,
 219   gld${EMULATION_NAME}_after_allocation,
 220   set_output_arch_default,
 221   ldemul_default_target,
 222   before_allocation_default,
 223   gld${EMULATION_NAME}_get_script,
 224   "${EMULATION_NAME}",
 225   "${OUTPUT_FORMAT}",
 226   NULL, /* finish */
 227   NULL, /* create output section statements */
 228   NULL, /* open dynamic archive */
 229   NULL, /* place orphan */
 230   NULL, /* set symbols */
 231   NULL, /* parse args */
 232   NULL, /* add_options */
 233   NULL, /* handle_option */
 234   NULL, /* unrecognized file */
 235   NULL, /* list options */
 236   NULL, /* recognized file */
 237   NULL, /* find_potential_libraries */
 238   NULL  /* new_vers_pattern */
 239 };
 240 EOF