ld/emultempl/mipsecoff.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* Handle embedded relocs for MIPS.
   7    Copyright 1994 Free Software Foundation, Inc.
   8    Written by Ian Lance Taylor <ian@cygnus.com> based on generic.em.
   9
  10 This file is part of GLD, the Gnu Linker.
  11
  12 This program is free software; you can redistribute it and/or modify
  13 it under the terms of the GNU General Public License as published by
  14 the Free Software Foundation; either version 2 of the License, or
  15 (at your option) any later version.
  16
  17 This program is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with this program; if not, write to the Free Software
  24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  25
  26 #define TARGET_IS_${EMULATION_NAME}
  27
  28 #include "bfd.h"
  29 #include "sysdep.h"
  30 #include "bfdlink.h"
  31
  32 #include "ld.h"
  33 #include "config.h"
  34 #include "ldmain.h"
  35 #include "ldemul.h"
  36 #include "ldfile.h"
  37 #include "ldmisc.h"
  38
  39 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  40 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  41 static void check_sections PARAMS ((bfd *, asection *, PTR));
  42 static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
  43 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  44
  45 static void
  46 gld${EMULATION_NAME}_before_parse()
  47 {
  48 #ifndef TARGET_                 /* I.e., if not generic.  */
  49   ldfile_output_architecture = bfd_arch_${ARCH};
  50 #endif /* not TARGET_ */
  51 }
  52
  53 /* This function is run after all the input files have been opened.
  54    We create a .rel.sdata section for each input file with a non zero
  55    .sdata section.  The BFD backend will fill in these sections with
  56    magic numbers which can be used to relocate the data section at run
  57    time.  This will only do the right thing if all the input files
  58    have been compiled using -membedded-pic.  */
  59
  60 static void
  61 gld${EMULATION_NAME}_after_open ()
  62 {
  63   bfd *abfd;
  64
  65   if (! command_line.embedded_relocs
  66       || link_info.relocateable)
  67     return;
  68
  69   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
  70     {
  71       asection *datasec;
  72
  73       datasec = bfd_get_section_by_name (abfd, ".sdata");
  74
  75       /* Note that we assume that the reloc_count field has already
  76          been set up.  We could call bfd_get_reloc_upper_bound, but
  77          that returns the size of a memory buffer rather than a reloc
  78          count.  We do not want to call bfd_canonicalize_reloc,
  79          because although it would always work it would force us to
  80          read in the relocs into BFD canonical form, which would waste
  81          a significant amount of time and memory.  */
  82       if (datasec != NULL && datasec->reloc_count > 0)
  83         {
  84           asection *relsec;
  85
  86           relsec = bfd_make_section (abfd, ".rel.sdata");
  87           if (relsec == NULL
  88               || ! bfd_set_section_flags (abfd, relsec,
  89                                           (SEC_ALLOC
  90                                            | SEC_LOAD
  91                                            | SEC_HAS_CONTENTS
  92                                            | SEC_IN_MEMORY))
  93               || ! bfd_set_section_alignment (abfd, relsec, 2)
  94               || ! bfd_set_section_size (abfd, relsec,
  95                                          datasec->reloc_count * 4))
  96             einfo ("%F%B: can not create .rel.sdata section: %E");
  97         }
  98
  99       /* Double check that all other data sections are empty, as is
 100          required for embedded PIC code.  */
 101       bfd_map_over_sections (abfd, check_sections, (PTR) datasec);
 102     }
 103 }
 104
 105 /* Check that of the data sections, only the .sdata section has
 106    relocs.  This is called via bfd_map_over_sections.  */
 107
 108 static void
 109 check_sections (abfd, sec, sdatasec)
 110      bfd *abfd;
 111      asection *sec;
 112      PTR sdatasec;
 113 {
 114   if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0
 115       && sec != (asection *) sdatasec
 116       && sec->reloc_count != 0)
 117     einfo ("%F%X: section %s has relocs; can not use --embedded-relocs",
 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 ()
 127 {
 128   bfd *abfd;
 129
 130   if (! command_line.embedded_relocs
 131       || link_info.relocateable)
 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, ".sdata");
 140
 141       if (datasec == NULL || datasec->reloc_count == 0)
 142         continue;
 143
 144       relsec = bfd_get_section_by_name (abfd, ".rel.sdata");
 145       ASSERT (relsec != NULL);
 146
 147       if (! bfd_mips_ecoff_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",
 153                    abfd);
 154           else
 155             einfo ("%X%B: can not create runtime reloc information: %s",
 156                    abfd, errmsg);
 157         }
 158     }
 159 }
 160
 161 static char *
 162 gld${EMULATION_NAME}_get_script(isfile)
 163      int *isfile;
 164 EOF
 165
 166 if test -n "$COMPILE_IN"
 167 then
 168 # Scripts compiled in.
 169
 170 # sed commands to quote an ld script as a C string.
 171 sc="-f ${srcdir}/emultempl/stringify.sed"
 172
 173 cat >>e${EMULATION_NAME}.c <<EOF
 174 {
 175   *isfile = 0;
 176
 177   if (link_info.relocateable == true && config.build_constructors == true)
 178     return
 179 EOF
 180 sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
 181 echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
 182 sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
 183 echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
 184 sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
 185 echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
 186 sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
 187 echo '  ; else return'                                     >> e${EMULATION_NAME}.c
 188 sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
 189 echo '; }'                                                 >> e${EMULATION_NAME}.c
 190
 191 else
 192 # Scripts read from the filesystem.
 193
 194 cat >>e${EMULATION_NAME}.c <<EOF
 195 {
 196   *isfile = 1;
 197
 198   if (link_info.relocateable == true && config.build_constructors == true)
 199     return "ldscripts/${EMULATION_NAME}.xu";
 200   else if (link_info.relocateable == true)
 201     return "ldscripts/${EMULATION_NAME}.xr";
 202   else if (!config.text_read_only)
 203     return "ldscripts/${EMULATION_NAME}.xbn";
 204   else if (!config.magic_demand_paged)
 205     return "ldscripts/${EMULATION_NAME}.xn";
 206   else
 207     return "ldscripts/${EMULATION_NAME}.x";
 208 }
 209 EOF
 210
 211 fi
 212
 213 cat >>e${EMULATION_NAME}.c <<EOF
 214
 215 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 216 {
 217   gld${EMULATION_NAME}_before_parse,
 218   syslib_default,
 219   hll_default,
 220   after_parse_default,
 221   gld${EMULATION_NAME}_after_open,
 222   gld${EMULATION_NAME}_after_allocation,
 223   set_output_arch_default,
 224   ldemul_default_target,
 225   before_allocation_default,
 226   gld${EMULATION_NAME}_get_script,
 227   "${EMULATION_NAME}",
 228   "${OUTPUT_FORMAT}"
 229 };
 230 EOF