ld/emultempl/mipsecoff.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* Handle embedded relocs for MIPS.
   7    Copyright 1994, 95, 97, 99, 2000 Free Software Foundation, Inc.
   8    Written by Ian Lance Taylor <ian@cygnus.com> based on generic.em.
   9
  10 This file is part of GLD, the Gnu Linker.
  11
  12 This program is free software; you can redistribute it and/or modify
  13 it under the terms of the GNU General Public License as published by
  14 the Free Software Foundation; either version 2 of the License, or
  15 (at your option) any later version.
  16
  17 This program is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with this program; if not, write to the Free Software
  24 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  25
  26 #define TARGET_IS_${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 "ldmisc.h"
  35
  36 #include "ldexp.h"
  37 #include "ldlang.h"
  38 #include "ldfile.h"
  39 #include "ldemul.h"
  40
  41 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  42 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  43 static void check_sections PARAMS ((bfd *, asection *, PTR));
  44 static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
  45 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  46
  47 static void
  48 gld${EMULATION_NAME}_before_parse()
  49 {
  50 #ifndef TARGET_                 /* I.e., if not generic.  */
  51   ldfile_output_architecture = bfd_arch_${ARCH};
  52 #endif /* not TARGET_ */
  53 }
  54
  55 /* This function is run after all the input files have been opened.
  56    We create a .rel.sdata section for each input file with a non zero
  57    .sdata section.  The BFD backend will fill in these sections with
  58    magic numbers which can be used to relocate the data section at run
  59    time.  This will only do the right thing if all the input files
  60    have been compiled using -membedded-pic.  */
  61
  62 static void
  63 gld${EMULATION_NAME}_after_open ()
  64 {
  65   bfd *abfd;
  66
  67   if (! command_line.embedded_relocs
  68       || link_info.relocateable)
  69     return;
  70
  71   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  72     {
  73       asection *datasec;
  74
  75       /* As first-order business, make sure that each input BFD is ECOFF. It
  76          better be, as we are directly calling an ECOFF backend function.  */
  77       if (bfd_get_flavour (abfd) != bfd_target_ecoff_flavour)
  78         einfo ("%F%B: all input objects must be ECOFF for --embedded-relocs\n");
  79
  80       datasec = bfd_get_section_by_name (abfd, ".sdata");
  81
  82       /* Note that we assume that the reloc_count field has already
  83          been set up.  We could call bfd_get_reloc_upper_bound, but
  84          that returns the size of a memory buffer rather than a reloc
  85          count.  We do not want to call bfd_canonicalize_reloc,
  86          because although it would always work it would force us to
  87          read in the relocs into BFD canonical form, which would waste
  88          a significant amount of time and memory.  */
  89       if (datasec != NULL && datasec->reloc_count > 0)
  90         {
  91           asection *relsec;
  92
  93           relsec = bfd_make_section (abfd, ".rel.sdata");
  94           if (relsec == NULL
  95               || ! bfd_set_section_flags (abfd, relsec,
  96                                           (SEC_ALLOC
  97                                            | SEC_LOAD
  98                                            | SEC_HAS_CONTENTS
  99                                            | SEC_IN_MEMORY))
 100               || ! bfd_set_section_alignment (abfd, relsec, 2)
 101               || ! bfd_set_section_size (abfd, relsec,
 102                                          datasec->reloc_count * 4))
 103             einfo ("%F%B: can not create .rel.sdata section: %E\n");
 104         }
 105
 106       /* Double check that all other data sections are empty, as is
 107          required for embedded PIC code.  */
 108       bfd_map_over_sections (abfd, check_sections, (PTR) datasec);
 109     }
 110 }
 111
 112 /* Check that of the data sections, only the .sdata section has
 113    relocs.  This is called via bfd_map_over_sections.  */
 114
 115 static void
 116 check_sections (abfd, sec, sdatasec)
 117      bfd *abfd;
 118      asection *sec;
 119      PTR sdatasec;
 120 {
 121   if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0
 122       && sec != (asection *) sdatasec
 123       && sec->reloc_count != 0)
 124     einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
 125            abfd, bfd_get_section_name (abfd, sec));
 126 }
 127
 128 /* This function is called after the section sizes and offsets have
 129    been set.  If we are generating embedded relocs, it calls a special
 130    BFD backend routine to do the work.  */
 131
 132 static void
 133 gld${EMULATION_NAME}_after_allocation ()
 134 {
 135   bfd *abfd;
 136
 137   if (! command_line.embedded_relocs
 138       || link_info.relocateable)
 139     return;
 140
 141   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 142     {
 143       asection *datasec, *relsec;
 144       char *errmsg;
 145
 146       datasec = bfd_get_section_by_name (abfd, ".sdata");
 147
 148       if (datasec == NULL || datasec->reloc_count == 0)
 149         continue;
 150
 151       relsec = bfd_get_section_by_name (abfd, ".rel.sdata");
 152       ASSERT (relsec != NULL);
 153
 154       if (! bfd_mips_ecoff_create_embedded_relocs (abfd, &link_info,
 155                                                    datasec, relsec,
 156                                                    &errmsg))
 157         {
 158           if (errmsg == NULL)
 159             einfo ("%B%X: can not create runtime reloc information: %E\n",
 160                    abfd);
 161           else
 162             einfo ("%X%B: can not create runtime reloc information: %s\n",
 163                    abfd, errmsg);
 164         }
 165     }
 166 }
 167
 168 static char *
 169 gld${EMULATION_NAME}_get_script(isfile)
 170      int *isfile;
 171 EOF
 172
 173 if test -n "$COMPILE_IN"
 174 then
 175 # Scripts compiled in.
 176
 177 # sed commands to quote an ld script as a C string.
 178 sc="-f stringify.sed"
 179
 180 cat >>e${EMULATION_NAME}.c <<EOF
 181 {
 182   *isfile = 0;
 183
 184   if (link_info.relocateable == true && config.build_constructors == true)
 185     return
 186 EOF
 187 sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
 188 echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
 189 sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
 190 echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
 191 sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
 192 echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
 193 sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
 194 echo '  ; else return'                                     >> e${EMULATION_NAME}.c
 195 sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
 196 echo '; }'                                                 >> e${EMULATION_NAME}.c
 197
 198 else
 199 # Scripts read from the filesystem.
 200
 201 cat >>e${EMULATION_NAME}.c <<EOF
 202 {
 203   *isfile = 1;
 204
 205   if (link_info.relocateable == true && config.build_constructors == true)
 206     return "ldscripts/${EMULATION_NAME}.xu";
 207   else if (link_info.relocateable == true)
 208     return "ldscripts/${EMULATION_NAME}.xr";
 209   else if (!config.text_read_only)
 210     return "ldscripts/${EMULATION_NAME}.xbn";
 211   else if (!config.magic_demand_paged)
 212     return "ldscripts/${EMULATION_NAME}.xn";
 213   else
 214     return "ldscripts/${EMULATION_NAME}.x";
 215 }
 216 EOF
 217
 218 fi
 219
 220 cat >>e${EMULATION_NAME}.c <<EOF
 221
 222 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 223 {
 224   gld${EMULATION_NAME}_before_parse,
 225   syslib_default,
 226   hll_default,
 227   after_parse_default,
 228   gld${EMULATION_NAME}_after_open,
 229   gld${EMULATION_NAME}_after_allocation,
 230   set_output_arch_default,
 231   ldemul_default_target,
 232   before_allocation_default,
 233   gld${EMULATION_NAME}_get_script,
 234   "${EMULATION_NAME}",
 235   "${OUTPUT_FORMAT}",
 236   NULL, /* finish */
 237   NULL, /* create output section statements */
 238   NULL, /* open dynamic archive */
 239   NULL, /* place orphan */
 240   NULL, /* set symbols */
 241   NULL, /* parse args */
 242   NULL, /* unrecognized file */
 243   NULL, /* list options */
 244   NULL, /* recognized file */
 245   NULL  /* find_potential_libraries */
 246 };
 247 EOF