ld/emultempl/linux.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 fragment <<EOF
   9 /* This file is is generated by a shell script.  DO NOT EDIT! */
  10
  11 /* Linux a.out emulation code for ${EMULATION_NAME}
  12    Copyright (C) 1991-2020 Free Software Foundation, Inc.
  13    Written by Steve Chamberlain <sac@cygnus.com>
  14    Linux support by Eric Youngdale <ericy@cais.cais.com>
  15
  16    This file is part of the GNU Binutils.
  17
  18    This program is free software; you can redistribute it and/or modify
  19    it under the terms of the GNU General Public License as published by
  20    the Free Software Foundation; either version 3 of the License, or
  21    (at your option) any later version.
  22
  23    This program is distributed in the hope that it will be useful,
  24    but WITHOUT ANY WARRANTY; without even the implied warranty of
  25    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26    GNU General Public License for more details.
  27
  28    You should have received a copy of the GNU General Public License
  29    along with this program; if not, write to the Free Software
  30    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  31    MA 02110-1301, USA.  */
  32
  33 #define TARGET_IS_${EMULATION_NAME}
  34
  35 #include "sysdep.h"
  36 #include "bfd.h"
  37 #include "bfdlink.h"
  38 #include "ctf-api.h"
  39
  40 #include "ld.h"
  41 #include "ldmain.h"
  42 #include "ldmisc.h"
  43 #include "ldexp.h"
  44 #include "ldlang.h"
  45 #include "ldfile.h"
  46 #include "ldemul.h"
  47
  48 static void
  49 gld${EMULATION_NAME}_before_parse (void)
  50 {
  51   ldfile_set_output_arch ("${OUTPUT_ARCH}", bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`);
  52   input_flags.dynamic = TRUE;
  53   config.has_shared = TRUE;
  54   link_info.check_relocs_after_open_input = TRUE;
  55 EOF
  56 if test -n "$COMMONPAGESIZE"; then
  57 fragment <<EOF
  58   link_info.relro = DEFAULT_LD_Z_RELRO;
  59 EOF
  60 fi
  61 fragment <<EOF
  62 }
  63
  64 /* Try to open a dynamic archive.  This is where we know that Linux
  65    dynamic libraries have an extension of .sa.  */
  66
  67 static bfd_boolean
  68 gld${EMULATION_NAME}_open_dynamic_archive
  69   (const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
  70 {
  71   char *string;
  72
  73   if (! entry->flags.maybe_archive || entry->flags.full_name_provided)
  74     return FALSE;
  75
  76   string = (char *) xmalloc (strlen (search->name)
  77                              + strlen (entry->filename)
  78                              + strlen (arch)
  79                              + sizeof "/lib.sa");
  80
  81   sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch);
  82
  83   if (! ldfile_try_open_bfd (string, entry))
  84     {
  85       free (string);
  86       return FALSE;
  87     }
  88
  89   entry->filename = string;
  90
  91   return TRUE;
  92 }
  93
  94 /* This is called by the create_output_section_statements routine via
  95    lang_for_each_statement.  It locates any address assignment to
  96    .text, and modifies it to include the size of the headers.  This
  97    causes -Ttext to mean the starting address of the header, rather
  98    than the starting address of .text, which is compatible with other
  99    Linux tools.  */
 100
 101 static void
 102 gld${EMULATION_NAME}_find_address_statement (lang_statement_union_type *s)
 103 {
 104   if (s->header.type == lang_address_statement_enum
 105       && strcmp (s->address_statement.section_name, ".text") == 0)
 106     {
 107       ASSERT (s->address_statement.address->type.node_class == etree_value);
 108       s->address_statement.address->value.value += 0x20;
 109     }
 110 }
 111
 112 /* This is called before opening the input BFD's.  */
 113
 114 static void
 115 gld${EMULATION_NAME}_create_output_section_statements (void)
 116 {
 117   lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement);
 118 }
 119
 120 /* This is called after the sections have been attached to output
 121    sections, but before any sizes or addresses have been set.  */
 122
 123 static void
 124 gld${EMULATION_NAME}_before_allocation (void)
 125 {
 126   if (bfd_link_relocatable (&link_info))
 127     return;
 128
 129   /* Let the backend work out the sizes of any sections required by
 130      dynamic linking.  */
 131   if (! bfd_${EMULATION_NAME}_size_dynamic_sections (link_info.output_bfd,
 132                                                      &link_info))
 133     einfo (_("%F%P: failed to set dynamic section sizes: %E\n"));
 134
 135   before_allocation_default ();
 136 }
 137
 138 static char *
 139 gld${EMULATION_NAME}_get_script (int *isfile)
 140 EOF
 141
 142 if test x"$COMPILE_IN" = xyes
 143 then
 144 # Scripts compiled in.
 145
 146 # sed commands to quote an ld script as a C string.
 147 sc="-f stringify.sed"
 148
 149 fragment <<EOF
 150 {
 151   *isfile = 0;
 152
 153   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 154     return
 155 EOF
 156 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 157 echo '  ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
 158 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 159 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 160 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 161 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 162 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 163 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 164 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 165 echo '; }'                                             >> e${EMULATION_NAME}.c
 166
 167 else
 168 # Scripts read from the filesystem.
 169
 170 fragment <<EOF
 171 {
 172   *isfile = 1;
 173
 174   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 175     return "ldscripts/${EMULATION_NAME}.xu";
 176   else if (bfd_link_relocatable (&link_info))
 177     return "ldscripts/${EMULATION_NAME}.xr";
 178   else if (!config.text_read_only)
 179     return "ldscripts/${EMULATION_NAME}.xbn";
 180   else if (!config.magic_demand_paged)
 181     return "ldscripts/${EMULATION_NAME}.xn";
 182   else
 183     return "ldscripts/${EMULATION_NAME}.x";
 184 }
 185 EOF
 186
 187 fi
 188
 189 fragment <<EOF
 190
 191 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 192 {
 193   gld${EMULATION_NAME}_before_parse,
 194   syslib_default,
 195   hll_default,
 196   after_parse_default,
 197   after_open_default,
 198   after_check_relocs_default,
 199   before_place_orphans_default,
 200   after_allocation_default,
 201   set_output_arch_default,
 202   ldemul_default_target,
 203   gld${EMULATION_NAME}_before_allocation,
 204   gld${EMULATION_NAME}_get_script,
 205   "${EMULATION_NAME}",
 206   "${OUTPUT_FORMAT}",
 207   finish_default,
 208   gld${EMULATION_NAME}_create_output_section_statements,
 209   gld${EMULATION_NAME}_open_dynamic_archive,
 210   NULL, /* place orphan */
 211   NULL, /* set symbols */
 212   NULL, /* parse args */
 213   NULL, /* add_options */
 214   NULL, /* handle_option */
 215   NULL, /* unrecognized file */
 216   NULL, /* list options */
 217   NULL, /* recognized file */
 218   NULL, /* find_potential_libraries */
 219   NULL, /* new_vers_pattern */
 220   NULL, /* extra_map_file_text */
 221   ${LDEMUL_EMIT_CTF_EARLY-NULL},
 222   ${LDEMUL_EXAMINE_STRTAB_FOR_CTF-NULL},
 223   ${LDEMUL_PRINT_SYMBOL-NULL}
 224 };
 225 EOF