ld/emultempl/mipsecoff.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 if [ -z "$MACHINE" ]; then
   4   OUTPUT_ARCH=${ARCH}
   5 else
   6   OUTPUT_ARCH=${ARCH}:${MACHINE}
   7 fi
   8 cat >e${EMULATION_NAME}.c <<EOF
   9 /* This file is is generated by a shell script.  DO NOT EDIT! */
  10
  11 /* Handle embedded relocs for MIPS.
  12    Copyright 1994, 1995, 1997, 2000, 2002, 2003, 2004
  13    Free Software Foundation, Inc.
  14    Written by Ian Lance Taylor <ian@cygnus.com> based on generic.em.
  15
  16 This file is part of GLD, the Gnu Linker.
  17
  18 This program is free software; you can redistribute it and/or modify
  19 it under the terms of the GNU General Public License as published by
  20 the Free Software Foundation; either version 2 of the License, or
  21 (at your option) any later version.
  22
  23 This program is distributed in the hope that it will be useful,
  24 but WITHOUT ANY WARRANTY; without even the implied warranty of
  25 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26 GNU General Public License for more details.
  27
  28 You should have received a copy of the GNU General Public License
  29 along with this program; if not, write to the Free Software
  30 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  31
  32 #define TARGET_IS_${EMULATION_NAME}
  33
  34 #include "bfd.h"
  35 #include "sysdep.h"
  36 #include "bfdlink.h"
  37
  38 #include "ld.h"
  39 #include "ldmain.h"
  40 #include "ldmisc.h"
  41
  42 #include "ldexp.h"
  43 #include "ldlang.h"
  44 #include "ldfile.h"
  45 #include "ldemul.h"
  46
  47 static void check_sections (bfd *, asection *, void *);
  48
  49 static void
  50 gld${EMULATION_NAME}_before_parse (void)
  51 {
  52 #ifndef TARGET_                 /* I.e., if not generic.  */
  53   ldfile_set_output_arch ("${OUTPUT_ARCH}", bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`);
  54 #endif /* not TARGET_ */
  55 }
  56
  57 /* This function is run after all the input files have been opened.
  58    We create a .rel.sdata section for each input file with a non zero
  59    .sdata section.  The BFD backend will fill in these sections with
  60    magic numbers which can be used to relocate the data section at run
  61    time.  This will only do the right thing if all the input files
  62    have been compiled using -membedded-pic.  */
  63
  64 static void
  65 gld${EMULATION_NAME}_after_open (void)
  66 {
  67   bfd *abfd;
  68
  69   if (! command_line.embedded_relocs
  70       || link_info.relocatable)
  71     return;
  72
  73   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  74     {
  75       asection *datasec;
  76
  77       /* As first-order business, make sure that each input BFD is ECOFF. It
  78          better be, as we are directly calling an ECOFF backend function.  */
  79       if (bfd_get_flavour (abfd) != bfd_target_ecoff_flavour)
  80         einfo ("%F%B: all input objects must be ECOFF for --embedded-relocs\n");
  81
  82       datasec = bfd_get_section_by_name (abfd, ".sdata");
  83
  84       /* Note that we assume that the reloc_count field has already
  85          been set up.  We could call bfd_get_reloc_upper_bound, but
  86          that returns the size of a memory buffer rather than a reloc
  87          count.  We do not want to call bfd_canonicalize_reloc,
  88          because although it would always work it would force us to
  89          read in the relocs into BFD canonical form, which would waste
  90          a significant amount of time and memory.  */
  91       if (datasec != NULL && datasec->reloc_count > 0)
  92         {
  93           asection *relsec;
  94
  95           relsec = bfd_make_section (abfd, ".rel.sdata");
  96           if (relsec == NULL
  97               || ! bfd_set_section_flags (abfd, relsec,
  98                                           (SEC_ALLOC
  99                                            | SEC_LOAD
 100                                            | SEC_HAS_CONTENTS
 101                                            | SEC_IN_MEMORY))
 102               || ! bfd_set_section_alignment (abfd, relsec, 2)
 103               || ! bfd_set_section_size (abfd, relsec,
 104                                          datasec->reloc_count * 4))
 105             einfo ("%F%B: can not create .rel.sdata section: %E\n");
 106         }
 107
 108       /* Double check that all other data sections are empty, as is
 109          required for embedded PIC code.  */
 110       bfd_map_over_sections (abfd, check_sections, datasec);
 111     }
 112 }
 113
 114 /* Check that of the data sections, only the .sdata section has
 115    relocs.  This is called via bfd_map_over_sections.  */
 116
 117 static void
 118 check_sections (bfd *abfd, asection *sec, void *sdatasec)
 119 {
 120   if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0
 121       && sec != sdatasec
 122       && sec->reloc_count != 0)
 123     einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
 124            abfd, bfd_get_section_name (abfd, sec));
 125 }
 126
 127 /* This function is called after the section sizes and offsets have
 128    been set.  If we are generating embedded relocs, it calls a special
 129    BFD backend routine to do the work.  */
 130
 131 static void
 132 gld${EMULATION_NAME}_after_allocation (void)
 133 {
 134   bfd *abfd;
 135
 136   if (! command_line.embedded_relocs
 137       || link_info.relocatable)
 138     return;
 139
 140   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 141     {
 142       asection *datasec, *relsec;
 143       char *errmsg;
 144
 145       datasec = bfd_get_section_by_name (abfd, ".sdata");
 146
 147       if (datasec == NULL || datasec->reloc_count == 0)
 148         continue;
 149
 150       relsec = bfd_get_section_by_name (abfd, ".rel.sdata");
 151       ASSERT (relsec != NULL);
 152
 153       if (! bfd_mips_ecoff_create_embedded_relocs (abfd, &link_info,
 154                                                    datasec, relsec,
 155                                                    &errmsg))
 156         {
 157           if (errmsg == NULL)
 158             einfo ("%B%X: can not create runtime reloc information: %E\n",
 159                    abfd);
 160           else
 161             einfo ("%X%B: can not create runtime reloc information: %s\n",
 162                    abfd, errmsg);
 163         }
 164     }
 165 }
 166
 167 static char *
 168 gld${EMULATION_NAME}_get_script (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.relocatable && config.build_constructors)
 183     return
 184 EOF
 185 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 186 echo '  ; else if (link_info.relocatable) return'     >> e${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${EMULATION_NAME}.c <<EOF
 200 {
 201   *isfile = 1;
 202
 203   if (link_info.relocatable && config.build_constructors)
 204     return "ldscripts/${EMULATION_NAME}.xu";
 205   else if (link_info.relocatable)
 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