ld/emultempl/mipsecoff.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* Handle embedded relocs for MIPS.
   7    Copyright 1994, 95, 97, 1999 Free Software Foundation, Inc.
   8    Written by Ian Lance Taylor <ian@cygnus.com> based on generic.em.
   9
  10 This file is part of GLD, the Gnu Linker.
  11
  12 This program is free software; you can redistribute it and/or modify
  13 it under the terms of the GNU General Public License as published by
  14 the Free Software Foundation; either version 2 of the License, or
  15 (at your option) any later version.
  16
  17 This program is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with this program; if not, write to the Free Software
  24 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  25
  26 #define TARGET_IS_${EMULATION_NAME}
  27
  28 #include "bfd.h"
  29 #include "sysdep.h"
  30 #include "bfdlink.h"
  31
  32 #include "ld.h"
  33 #include "ldmain.h"
  34 #include "ldemul.h"
  35 #include "ldfile.h"
  36 #include "ldmisc.h"
  37
  38 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  39 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  40 static void check_sections PARAMS ((bfd *, asection *, PTR));
  41 static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
  42 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  43
  44 static void
  45 gld${EMULATION_NAME}_before_parse()
  46 {
  47 #ifndef TARGET_                 /* I.e., if not generic.  */
  48   ldfile_output_architecture = bfd_arch_${ARCH};
  49 #endif /* not TARGET_ */
  50 }
  51
  52 /* This function is run after all the input files have been opened.
  53    We create a .rel.sdata section for each input file with a non zero
  54    .sdata 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.  This will only do the right thing if all the input files
  57    have been compiled using -membedded-pic.  */
  58
  59 static void
  60 gld${EMULATION_NAME}_after_open ()
  61 {
  62   bfd *abfd;
  63
  64   if (! command_line.embedded_relocs
  65       || link_info.relocateable)
  66     return;
  67
  68   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  69     {
  70       asection *datasec;
  71
  72       datasec = bfd_get_section_by_name (abfd, ".sdata");
  73
  74       /* Note that we assume that the reloc_count field has already
  75          been set up.  We could call bfd_get_reloc_upper_bound, but
  76          that returns the size of a memory buffer rather than a reloc
  77          count.  We do not want to call bfd_canonicalize_reloc,
  78          because although it would always work it would force us to
  79          read in the relocs into BFD canonical form, which would waste
  80          a significant amount of time and memory.  */
  81       if (datasec != NULL && datasec->reloc_count > 0)
  82         {
  83           asection *relsec;
  84
  85           relsec = bfd_make_section (abfd, ".rel.sdata");
  86           if (relsec == NULL
  87               || ! bfd_set_section_flags (abfd, relsec,
  88                                           (SEC_ALLOC
  89                                            | SEC_LOAD
  90                                            | SEC_HAS_CONTENTS
  91                                            | SEC_IN_MEMORY))
  92               || ! bfd_set_section_alignment (abfd, relsec, 2)
  93               || ! bfd_set_section_size (abfd, relsec,
  94                                          datasec->reloc_count * 4))
  95             einfo ("%F%B: can not create .rel.sdata section: %E\n");
  96         }
  97
  98       /* Double check that all other data sections are empty, as is
  99          required for embedded PIC code.  */
 100       bfd_map_over_sections (abfd, check_sections, (PTR) datasec);
 101     }
 102 }
 103
 104 /* Check that of the data sections, only the .sdata section has
 105    relocs.  This is called via bfd_map_over_sections.  */
 106
 107 static void
 108 check_sections (abfd, sec, sdatasec)
 109      bfd *abfd;
 110      asection *sec;
 111      PTR sdatasec;
 112 {
 113   if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0
 114       && sec != (asection *) sdatasec
 115       && sec->reloc_count != 0)
 116     einfo ("%P%X: section %s has relocs; can not use --embedded-relocs\n",
 117            abfd, bfd_get_section_name (abfd, sec));
 118 }
 119
 120 /* This function is called after the section sizes and offsets have
 121    been set.  If we are generating embedded relocs, it calls a special
 122    BFD backend routine to do the work.  */
 123
 124 static void
 125 gld${EMULATION_NAME}_after_allocation ()
 126 {
 127   bfd *abfd;
 128
 129   if (! command_line.embedded_relocs
 130       || link_info.relocateable)
 131     return;
 132
 133   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 134     {
 135       asection *datasec, *relsec;
 136       char *errmsg;
 137
 138       datasec = bfd_get_section_by_name (abfd, ".sdata");
 139
 140       if (datasec == NULL || datasec->reloc_count == 0)
 141         continue;
 142
 143       relsec = bfd_get_section_by_name (abfd, ".rel.sdata");
 144       ASSERT (relsec != NULL);
 145
 146       if (! bfd_mips_ecoff_create_embedded_relocs (abfd, &link_info,
 147                                                    datasec, relsec,
 148                                                    &errmsg))
 149         {
 150           if (errmsg == NULL)
 151             einfo ("%B%X: can not create runtime reloc information: %E\n",
 152                    abfd);
 153           else
 154             einfo ("%X%B: can not create runtime reloc information: %s\n",
 155                    abfd, errmsg);
 156         }
 157     }
 158 }
 159
 160 static char *
 161 gld${EMULATION_NAME}_get_script(isfile)
 162      int *isfile;
 163 EOF
 164
 165 if test -n "$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.relocateable == true && config.build_constructors == true)
 177     return
 178 EOF
 179 sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
 180 echo '  ; else if (link_info.relocateable == true) return' >> e${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${EMULATION_NAME}.c <<EOF
 194 {
 195   *isfile = 1;
 196
 197   if (link_info.relocateable == true && config.build_constructors == true)
 198     return "ldscripts/${EMULATION_NAME}.xu";
 199   else if (link_info.relocateable == true)
 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, /* unrecognized file */
 235   NULL, /* list options */
 236   NULL  /* recognized file */
 237 };
 238 EOF