ld/emultempl/m68kcoff.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* Handle embedded relocs for m68k.
   7    Copyright 2000, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
   8    Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on generic.em
   9    by Steve Chamberlain <steve@cygnus.com>, embedded relocs code based on
  10    mipsecoff.em by Ian Lance Taylor <ian@cygnus.com>.
  11
  12 This file is part of GLD, the Gnu Linker.
  13
  14 This program is free software; you can redistribute it and/or modify
  15 it under the terms of the GNU General Public License as published by
  16 the Free Software Foundation; either version 2 of the License, or
  17 (at your option) any later version.
  18
  19 This program is distributed in the hope that it will be useful,
  20 but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 GNU General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with this program; if not, write to the Free Software
  26 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  27
  28 #define TARGET_IS_${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 "ldexp.h"
  37 #include "ldlang.h"
  38 #include "ldfile.h"
  39 #include "ldemul.h"
  40 #include "ldmisc.h"
  41
  42 static void check_sections (bfd *, asection *, void *);
  43
  44 static void
  45 gld${EMULATION_NAME}_before_parse (void)
  46 {
  47 #ifndef TARGET_                 /* I.e., if not generic.  */
  48   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  49 #endif /* not TARGET_ */
  50 }
  51
  52 /* This function is run after all the input files have been opened.
  53    We create a .emreloc section for each input file with a non zero
  54    .data section.  The BFD backend will fill in these sections with
  55    magic numbers which can be used to relocate the data section at run
  56    time.  */
  57
  58 static void
  59 gld${EMULATION_NAME}_after_open (void)
  60 {
  61   bfd *abfd;
  62
  63   if (! command_line.embedded_relocs
  64       || link_info.relocatable)
  65     return;
  66
  67   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  68     {
  69       asection *datasec;
  70
  71       /* As first-order business, make sure that each input BFD is COFF. It
  72          better be, as we are directly calling a COFF backend function.  */
  73       if (bfd_get_flavour (abfd) != bfd_target_coff_flavour)
  74         einfo ("%F%B: all input objects must be COFF for --embedded-relocs\n");
  75
  76       datasec = bfd_get_section_by_name (abfd, ".data");
  77
  78       /* Note that we assume that the reloc_count field has already
  79          been set up.  We could call bfd_get_reloc_upper_bound, but
  80          that returns the size of a memory buffer rather than a reloc
  81          count.  We do not want to call bfd_canonicalize_reloc,
  82          because although it would always work it would force us to
  83          read in the relocs into BFD canonical form, which would waste
  84          a significant amount of time and memory.  */
  85       if (datasec != NULL && datasec->reloc_count > 0)
  86         {
  87           asection *relsec;
  88
  89           relsec = bfd_make_section (abfd, ".emreloc");
  90           if (relsec == NULL
  91               || ! bfd_set_section_flags (abfd, relsec,
  92                                           (SEC_ALLOC
  93                                            | SEC_LOAD
  94                                            | SEC_HAS_CONTENTS
  95                                            | SEC_IN_MEMORY))
  96               || ! bfd_set_section_alignment (abfd, relsec, 2)
  97               || ! bfd_set_section_size (abfd, relsec,
  98                                          datasec->reloc_count * 12))
  99             einfo ("%F%B: can not create .emreloc section: %E\n");
 100         }
 101
 102       /* Double check that all other data sections are empty, as is
 103          required for embedded PIC code.  */
 104       bfd_map_over_sections (abfd, check_sections, datasec);
 105     }
 106 }
 107
 108 /* Check that of the data sections, only the .data section has
 109    relocs.  This is called via bfd_map_over_sections.  */
 110
 111 static void
 112 check_sections (bfd *abfd, asection *sec, void *datasec)
 113 {
 114   if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
 115       && sec != datasec
 116       && sec->reloc_count != 0)
 117     einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
 118            abfd, bfd_get_section_name (abfd, sec));
 119 }
 120
 121 /* This function is called after the section sizes and offsets have
 122    been set.  If we are generating embedded relocs, it calls a special
 123    BFD backend routine to do the work.  */
 124
 125 static void
 126 gld${EMULATION_NAME}_after_allocation (void)
 127 {
 128   bfd *abfd;
 129
 130   if (! command_line.embedded_relocs
 131       || link_info.relocatable)
 132     return;
 133
 134   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 135     {
 136       asection *datasec, *relsec;
 137       char *errmsg;
 138
 139       datasec = bfd_get_section_by_name (abfd, ".data");
 140
 141       if (datasec == NULL || datasec->reloc_count == 0)
 142         continue;
 143
 144       relsec = bfd_get_section_by_name (abfd, ".emreloc");
 145       ASSERT (relsec != NULL);
 146
 147       if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info,
 148                                                    datasec, relsec,
 149                                                    &errmsg))
 150         {
 151           if (errmsg == NULL)
 152             einfo ("%B%X: can not create runtime reloc information: %E\n",
 153                    abfd);
 154           else
 155             einfo ("%X%B: can not create runtime reloc information: %s\n",
 156                    abfd, errmsg);
 157         }
 158     }
 159 }
 160
 161 static char *
 162 gld${EMULATION_NAME}_get_script (int *isfile)
 163 EOF
 164
 165 if test -n "$COMPILE_IN"
 166 then
 167 # Scripts compiled in.
 168
 169 # sed commands to quote an ld script as a C string.
 170 sc="-f stringify.sed"
 171
 172 cat >>e${EMULATION_NAME}.c <<EOF
 173 {
 174   *isfile = 0;
 175
 176   if (link_info.relocatable && config.build_constructors)
 177     return
 178 EOF
 179 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 180 echo '  ; else if (link_info.relocatable) return'     >> e${EMULATION_NAME}.c
 181 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 182 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 183 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 184 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 185 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 186 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 187 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 188 echo '; }'                                             >> e${EMULATION_NAME}.c
 189
 190 else
 191 # Scripts read from the filesystem.
 192
 193 cat >>e${EMULATION_NAME}.c <<EOF
 194 {
 195   *isfile = 1;
 196
 197   if (link_info.relocatable && config.build_constructors)
 198     return "ldscripts/${EMULATION_NAME}.xu";
 199   else if (link_info.relocatable)
 200     return "ldscripts/${EMULATION_NAME}.xr";
 201   else if (!config.text_read_only)
 202     return "ldscripts/${EMULATION_NAME}.xbn";
 203   else if (!config.magic_demand_paged)
 204     return "ldscripts/${EMULATION_NAME}.xn";
 205   else
 206     return "ldscripts/${EMULATION_NAME}.x";
 207 }
 208 EOF
 209
 210 fi
 211
 212 cat >>e${EMULATION_NAME}.c <<EOF
 213
 214 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 215 {
 216   gld${EMULATION_NAME}_before_parse,
 217   syslib_default,
 218   hll_default,
 219   after_parse_default,
 220   gld${EMULATION_NAME}_after_open,
 221   gld${EMULATION_NAME}_after_allocation,
 222   set_output_arch_default,
 223   ldemul_default_target,
 224   before_allocation_default,
 225   gld${EMULATION_NAME}_get_script,
 226   "${EMULATION_NAME}",
 227   "${OUTPUT_FORMAT}",
 228   NULL, /* finish */
 229   NULL, /* create output section statements */
 230   NULL, /* open dynamic archive */
 231   NULL, /* place orphan */
 232   NULL, /* set symbols */
 233   NULL, /* parse args */
 234   NULL, /* add_options */
 235   NULL, /* handle_option */
 236   NULL, /* unrecognized file */
 237   NULL, /* list options */
 238   NULL, /* recognized file */
 239   NULL, /* find_potential_libraries */
 240   NULL  /* new_vers_pattern */
 241 };
 242 EOF