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 gld${EMULATION_NAME}_before_parse PARAMS ((void));
  41 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  42 static void check_sections PARAMS ((bfd *, asection *, PTR));
  43 static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
  44 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  45
  46 static void
  47 gld${EMULATION_NAME}_before_parse ()
  48 {
  49 #ifndef TARGET_                 /* I.e., if not generic.  */
  50   ldfile_set_output_arch ("`echo ${ARCH}`");
  51 #endif /* not TARGET_ */
  52 }
  53
  54 /* This function is run after all the input files have been opened.
  55    We create a .emreloc section for each input file with a non zero
  56    .data section.  The BFD backend will fill in these sections with
  57    magic numbers which can be used to relocate the data section at run
  58    time.  */
  59
  60 static void
  61 gld${EMULATION_NAME}_after_open ()
  62 {
  63   bfd *abfd;
  64
  65   if (! command_line.embedded_relocs
  66       || link_info.relocateable)
  67     return;
  68
  69   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  70     {
  71       asection *datasec;
  72
  73       /* As first-order business, make sure that each input BFD is COFF. It
  74          better be, as we are directly calling a COFF backend function.  */
  75       if (bfd_get_flavour (abfd) != bfd_target_coff_flavour)
  76         einfo ("%F%B: all input objects must be COFF for --embedded-relocs\n");
  77
  78       datasec = bfd_get_section_by_name (abfd, ".data");
  79
  80       /* Note that we assume that the reloc_count field has already
  81          been set up.  We could call bfd_get_reloc_upper_bound, but
  82          that returns the size of a memory buffer rather than a reloc
  83          count.  We do not want to call bfd_canonicalize_reloc,
  84          because although it would always work it would force us to
  85          read in the relocs into BFD canonical form, which would waste
  86          a significant amount of time and memory.  */
  87       if (datasec != NULL && datasec->reloc_count > 0)
  88         {
  89           asection *relsec;
  90
  91           relsec = bfd_make_section (abfd, ".emreloc");
  92           if (relsec == NULL
  93               || ! bfd_set_section_flags (abfd, relsec,
  94                                           (SEC_ALLOC
  95                                            | SEC_LOAD
  96                                            | SEC_HAS_CONTENTS
  97                                            | SEC_IN_MEMORY))
  98               || ! bfd_set_section_alignment (abfd, relsec, 2)
  99               || ! bfd_set_section_size (abfd, relsec,
 100                                          datasec->reloc_count * 12))
 101             einfo ("%F%B: can not create .emreloc section: %E\n");
 102         }
 103
 104       /* Double check that all other data sections are empty, as is
 105          required for embedded PIC code.  */
 106       bfd_map_over_sections (abfd, check_sections, (PTR) datasec);
 107     }
 108 }
 109
 110 /* Check that of the data sections, only the .data section has
 111    relocs.  This is called via bfd_map_over_sections.  */
 112
 113 static void
 114 check_sections (abfd, sec, datasec)
 115      bfd *abfd;
 116      asection *sec;
 117      PTR datasec;
 118 {
 119   if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
 120       && sec != (asection *) datasec
 121       && sec->reloc_count != 0)
 122     einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
 123            abfd, bfd_get_section_name (abfd, sec));
 124 }
 125
 126 /* This function is called after the section sizes and offsets have
 127    been set.  If we are generating embedded relocs, it calls a special
 128    BFD backend routine to do the work.  */
 129
 130 static void
 131 gld${EMULATION_NAME}_after_allocation ()
 132 {
 133   bfd *abfd;
 134
 135   if (! command_line.embedded_relocs
 136       || link_info.relocateable)
 137     return;
 138
 139   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 140     {
 141       asection *datasec, *relsec;
 142       char *errmsg;
 143
 144       datasec = bfd_get_section_by_name (abfd, ".data");
 145
 146       if (datasec == NULL || datasec->reloc_count == 0)
 147         continue;
 148
 149       relsec = bfd_get_section_by_name (abfd, ".emreloc");
 150       ASSERT (relsec != NULL);
 151
 152       if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info,
 153                                                    datasec, relsec,
 154                                                    &errmsg))
 155         {
 156           if (errmsg == NULL)
 157             einfo ("%B%X: can not create runtime reloc information: %E\n",
 158                    abfd);
 159           else
 160             einfo ("%X%B: can not create runtime reloc information: %s\n",
 161                    abfd, errmsg);
 162         }
 163     }
 164 }
 165
 166 static char *
 167 gld${EMULATION_NAME}_get_script(isfile)
 168      int *isfile;
 169 EOF
 170
 171 if test -n "$COMPILE_IN"
 172 then
 173 # Scripts compiled in.
 174
 175 # sed commands to quote an ld script as a C string.
 176 sc="-f stringify.sed"
 177
 178 cat >>e${EMULATION_NAME}.c <<EOF
 179 {
 180   *isfile = 0;
 181
 182   if (link_info.relocateable && config.build_constructors)
 183     return
 184 EOF
 185 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 186 echo '  ; else if (link_info.relocateable) return'     >> e${EMULATION_NAME}.c
 187 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 188 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 189 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 190 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 191 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 192 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 193 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 194 echo '; }'                                             >> e${EMULATION_NAME}.c
 195
 196 else
 197 # Scripts read from the filesystem.
 198
 199 cat >>e${EMULATION_NAME}.c <<EOF
 200 {
 201   *isfile = 1;
 202
 203   if (link_info.relocateable && config.build_constructors)
 204     return "ldscripts/${EMULATION_NAME}.xu";
 205   else if (link_info.relocateable)
 206     return "ldscripts/${EMULATION_NAME}.xr";
 207   else if (!config.text_read_only)
 208     return "ldscripts/${EMULATION_NAME}.xbn";
 209   else if (!config.magic_demand_paged)
 210     return "ldscripts/${EMULATION_NAME}.xn";
 211   else
 212     return "ldscripts/${EMULATION_NAME}.x";
 213 }
 214 EOF
 215
 216 fi
 217
 218 cat >>e${EMULATION_NAME}.c <<EOF
 219
 220 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 221 {
 222   gld${EMULATION_NAME}_before_parse,
 223   syslib_default,
 224   hll_default,
 225   after_parse_default,
 226   gld${EMULATION_NAME}_after_open,
 227   gld${EMULATION_NAME}_after_allocation,
 228   set_output_arch_default,
 229   ldemul_default_target,
 230   before_allocation_default,
 231   gld${EMULATION_NAME}_get_script,
 232   "${EMULATION_NAME}",
 233   "${OUTPUT_FORMAT}",
 234   NULL, /* finish */
 235   NULL, /* create output section statements */
 236   NULL, /* open dynamic archive */
 237   NULL, /* place orphan */
 238   NULL, /* set symbols */
 239   NULL, /* parse args */
 240   NULL, /* add_options */
 241   NULL, /* handle_option */
 242   NULL, /* unrecognized file */
 243   NULL, /* list options */
 244   NULL, /* recognized file */
 245   NULL, /* find_potential_libraries */
 246   NULL  /* new_vers_pattern */
 247 };
 248 EOF