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${EMULATION_NAME}.c <<EOF
   9 /* This file is is generated by a shell script.  DO NOT EDIT! */
  10
  11 /* Handle embedded relocs for MIPS.
  12    Copyright 1994, 1995, 1997, 2000, 2002, 2003
  13    Free Software Foundation, Inc.
  14    Written by Ian Lance Taylor <ian@cygnus.com> based on generic.em.
  15
  16 This file is part of GLD, the Gnu Linker.
  17
  18 This program is free software; you can redistribute it and/or modify
  19 it under the terms of the GNU General Public License as published by
  20 the Free Software Foundation; either version 2 of the License, or
  21 (at your option) any later version.
  22
  23 This program is distributed in the hope that it will be useful,
  24 but WITHOUT ANY WARRANTY; without even the implied warranty of
  25 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26 GNU General Public License for more details.
  27
  28 You should have received a copy of the GNU General Public License
  29 along with this program; if not, write to the Free Software
  30 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  31
  32 #define TARGET_IS_${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${EMULATION_NAME}_before_parse (void)
  51 {
  52 #ifndef TARGET_                 /* I.e., if not generic.  */
  53   const bfd_arch_info_type *arch = bfd_scan_arch ("${OUTPUT_ARCH}");
  54   if (arch)
  55     {
  56       ldfile_output_architecture = arch->arch;
  57       ldfile_output_machine = arch->mach;
  58       ldfile_output_machine_name = arch->printable_name;
  59     }
  60   else
  61     ldfile_output_architecture = bfd_arch_${ARCH};
  62 #endif /* not TARGET_ */
  63 }
  64
  65 /* This function is run after all the input files have been opened.
  66    We create a .rel.sdata section for each input file with a non zero
  67    .sdata section.  The BFD backend will fill in these sections with
  68    magic numbers which can be used to relocate the data section at run
  69    time.  This will only do the right thing if all the input files
  70    have been compiled using -membedded-pic.  */
  71
  72 static void
  73 gld${EMULATION_NAME}_after_open (void)
  74 {
  75   bfd *abfd;
  76
  77   if (! command_line.embedded_relocs
  78       || link_info.relocatable)
  79     return;
  80
  81   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  82     {
  83       asection *datasec;
  84
  85       /* As first-order business, make sure that each input BFD is ECOFF. It
  86          better be, as we are directly calling an ECOFF backend function.  */
  87       if (bfd_get_flavour (abfd) != bfd_target_ecoff_flavour)
  88         einfo ("%F%B: all input objects must be ECOFF for --embedded-relocs\n");
  89
  90       datasec = bfd_get_section_by_name (abfd, ".sdata");
  91
  92       /* Note that we assume that the reloc_count field has already
  93          been set up.  We could call bfd_get_reloc_upper_bound, but
  94          that returns the size of a memory buffer rather than a reloc
  95          count.  We do not want to call bfd_canonicalize_reloc,
  96          because although it would always work it would force us to
  97          read in the relocs into BFD canonical form, which would waste
  98          a significant amount of time and memory.  */
  99       if (datasec != NULL && datasec->reloc_count > 0)
 100         {
 101           asection *relsec;
 102
 103           relsec = bfd_make_section (abfd, ".rel.sdata");
 104           if (relsec == NULL
 105               || ! bfd_set_section_flags (abfd, relsec,
 106                                           (SEC_ALLOC
 107                                            | SEC_LOAD
 108                                            | SEC_HAS_CONTENTS
 109                                            | SEC_IN_MEMORY))
 110               || ! bfd_set_section_alignment (abfd, relsec, 2)
 111               || ! bfd_set_section_size (abfd, relsec,
 112                                          datasec->reloc_count * 4))
 113             einfo ("%F%B: can not create .rel.sdata section: %E\n");
 114         }
 115
 116       /* Double check that all other data sections are empty, as is
 117          required for embedded PIC code.  */
 118       bfd_map_over_sections (abfd, check_sections, datasec);
 119     }
 120 }
 121
 122 /* Check that of the data sections, only the .sdata section has
 123    relocs.  This is called via bfd_map_over_sections.  */
 124
 125 static void
 126 check_sections (bfd *abfd, asection *sec, void *sdatasec)
 127 {
 128   if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0
 129       && sec != sdatasec
 130       && sec->reloc_count != 0)
 131     einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
 132            abfd, bfd_get_section_name (abfd, sec));
 133 }
 134
 135 /* This function is called after the section sizes and offsets have
 136    been set.  If we are generating embedded relocs, it calls a special
 137    BFD backend routine to do the work.  */
 138
 139 static void
 140 gld${EMULATION_NAME}_after_allocation (void)
 141 {
 142   bfd *abfd;
 143
 144   if (! command_line.embedded_relocs
 145       || link_info.relocatable)
 146     return;
 147
 148   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 149     {
 150       asection *datasec, *relsec;
 151       char *errmsg;
 152
 153       datasec = bfd_get_section_by_name (abfd, ".sdata");
 154
 155       if (datasec == NULL || datasec->reloc_count == 0)
 156         continue;
 157
 158       relsec = bfd_get_section_by_name (abfd, ".rel.sdata");
 159       ASSERT (relsec != NULL);
 160
 161       if (! bfd_mips_ecoff_create_embedded_relocs (abfd, &link_info,
 162                                                    datasec, relsec,
 163                                                    &errmsg))
 164         {
 165           if (errmsg == NULL)
 166             einfo ("%B%X: can not create runtime reloc information: %E\n",
 167                    abfd);
 168           else
 169             einfo ("%X%B: can not create runtime reloc information: %s\n",
 170                    abfd, errmsg);
 171         }
 172     }
 173 }
 174
 175 static char *
 176 gld${EMULATION_NAME}_get_script (int *isfile)
 177 EOF
 178
 179 if test -n "$COMPILE_IN"
 180 then
 181 # Scripts compiled in.
 182
 183 # sed commands to quote an ld script as a C string.
 184 sc="-f stringify.sed"
 185
 186 cat >>e${EMULATION_NAME}.c <<EOF
 187 {
 188   *isfile = 0;
 189
 190   if (link_info.relocatable && config.build_constructors)
 191     return
 192 EOF
 193 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 194 echo '  ; else if (link_info.relocatable) return'     >> e${EMULATION_NAME}.c
 195 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 196 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 197 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 198 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 199 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 200 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 201 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 202 echo '; }'                                             >> e${EMULATION_NAME}.c
 203
 204 else
 205 # Scripts read from the filesystem.
 206
 207 cat >>e${EMULATION_NAME}.c <<EOF
 208 {
 209   *isfile = 1;
 210
 211   if (link_info.relocatable && config.build_constructors)
 212     return "ldscripts/${EMULATION_NAME}.xu";
 213   else if (link_info.relocatable)
 214     return "ldscripts/${EMULATION_NAME}.xr";
 215   else if (!config.text_read_only)
 216     return "ldscripts/${EMULATION_NAME}.xbn";
 217   else if (!config.magic_demand_paged)
 218     return "ldscripts/${EMULATION_NAME}.xn";
 219   else
 220     return "ldscripts/${EMULATION_NAME}.x";
 221 }
 222 EOF
 223
 224 fi
 225
 226 cat >>e${EMULATION_NAME}.c <<EOF
 227
 228 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 229 {
 230   gld${EMULATION_NAME}_before_parse,
 231   syslib_default,
 232   hll_default,
 233   after_parse_default,
 234   gld${EMULATION_NAME}_after_open,
 235   gld${EMULATION_NAME}_after_allocation,
 236   set_output_arch_default,
 237   ldemul_default_target,
 238   before_allocation_default,
 239   gld${EMULATION_NAME}_get_script,
 240   "${EMULATION_NAME}",
 241   "${OUTPUT_FORMAT}",
 242   NULL, /* finish */
 243   NULL, /* create output section statements */
 244   NULL, /* open dynamic archive */
 245   NULL, /* place orphan */
 246   NULL, /* set symbols */
 247   NULL, /* parse args */
 248   NULL, /* add_options */
 249   NULL, /* handle_option */
 250   NULL, /* unrecognized file */
 251   NULL, /* list options */
 252   NULL, /* recognized file */
 253   NULL, /* find_potential_libraries */
 254   NULL  /* new_vers_pattern */
 255 };
 256 EOF