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 ${EMULATION_NAME}
  12    Copyright (C) 1991-2019 Free Software Foundation, Inc.
  13    Written by Steve Chamberlain <sac@cygnus.com>
  14    Linux support by Eric Youngdale <ericy@cais.cais.com>
  15
  16    This file is part of the GNU Binutils.
  17
  18    This program is free software; you can redistribute it and/or modify
  19    it under the terms of the GNU General Public License as published by
  20    the Free Software Foundation; either version 3 of the License, or
  21    (at your option) any later version.
  22
  23    This program is distributed in the hope that it will be useful,
  24    but WITHOUT ANY WARRANTY; without even the implied warranty of
  25    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26    GNU General Public License for more details.
  27
  28    You should have received a copy of the GNU General Public License
  29    along with this program; if not, write to the Free Software
  30    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  31    MA 02110-1301, USA.  */
  32
  33 #define TARGET_IS_${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 ${ARCH} | sed -e 's/:.*//'`);
  52   input_flags.dynamic = TRUE;
  53   config.has_shared = TRUE;
  54   link_info.check_relocs_after_open_input = TRUE;
  55   link_info.relro = DEFAULT_LD_Z_RELRO;
  56 }
  57
  58 /* Try to open a dynamic archive.  This is where we know that Linux
  59    dynamic libraries have an extension of .sa.  */
  60
  61 static bfd_boolean
  62 gld${EMULATION_NAME}_open_dynamic_archive
  63   (const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
  64 {
  65   char *string;
  66
  67   if (! entry->flags.maybe_archive || entry->flags.full_name_provided)
  68     return FALSE;
  69
  70   string = (char *) xmalloc (strlen (search->name)
  71                              + strlen (entry->filename)
  72                              + strlen (arch)
  73                              + sizeof "/lib.sa");
  74
  75   sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch);
  76
  77   if (! ldfile_try_open_bfd (string, entry))
  78     {
  79       free (string);
  80       return FALSE;
  81     }
  82
  83   entry->filename = string;
  84
  85   return TRUE;
  86 }
  87
  88 /* This is called by the create_output_section_statements routine via
  89    lang_for_each_statement.  It locates any address assignment to
  90    .text, and modifies it to include the size of the headers.  This
  91    causes -Ttext to mean the starting address of the header, rather
  92    than the starting address of .text, which is compatible with other
  93    Linux tools.  */
  94
  95 static void
  96 gld${EMULATION_NAME}_find_address_statement (lang_statement_union_type *s)
  97 {
  98   if (s->header.type == lang_address_statement_enum
  99       && strcmp (s->address_statement.section_name, ".text") == 0)
 100     {
 101       ASSERT (s->address_statement.address->type.node_class == etree_value);
 102       s->address_statement.address->value.value += 0x20;
 103     }
 104 }
 105
 106 /* This is called before opening the input BFD's.  */
 107
 108 static void
 109 gld${EMULATION_NAME}_create_output_section_statements (void)
 110 {
 111   lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement);
 112 }
 113
 114 /* This is called after the sections have been attached to output
 115    sections, but before any sizes or addresses have been set.  */
 116
 117 static void
 118 gld${EMULATION_NAME}_before_allocation (void)
 119 {
 120   if (bfd_link_relocatable (&link_info))
 121     return;
 122
 123   /* Let the backend work out the sizes of any sections required by
 124      dynamic linking.  */
 125   if (! bfd_${EMULATION_NAME}_size_dynamic_sections (link_info.output_bfd,
 126                                                      &link_info))
 127     einfo (_("%F%P: failed to set dynamic section sizes: %E\n"));
 128
 129   before_allocation_default ();
 130 }
 131
 132 static char *
 133 gld${EMULATION_NAME}_get_script (int *isfile)
 134 EOF
 135
 136 if test x"$COMPILE_IN" = xyes
 137 then
 138 # Scripts compiled in.
 139
 140 # sed commands to quote an ld script as a C string.
 141 sc="-f stringify.sed"
 142
 143 fragment <<EOF
 144 {
 145   *isfile = 0;
 146
 147   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 148     return
 149 EOF
 150 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 151 echo '  ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
 152 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 153 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 154 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 155 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 156 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 157 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 158 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 159 echo '; }'                                             >> e${EMULATION_NAME}.c
 160
 161 else
 162 # Scripts read from the filesystem.
 163
 164 fragment <<EOF
 165 {
 166   *isfile = 1;
 167
 168   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 169     return "ldscripts/${EMULATION_NAME}.xu";
 170   else if (bfd_link_relocatable (&link_info))
 171     return "ldscripts/${EMULATION_NAME}.xr";
 172   else if (!config.text_read_only)
 173     return "ldscripts/${EMULATION_NAME}.xbn";
 174   else if (!config.magic_demand_paged)
 175     return "ldscripts/${EMULATION_NAME}.xn";
 176   else
 177     return "ldscripts/${EMULATION_NAME}.x";
 178 }
 179 EOF
 180
 181 fi
 182
 183 fragment <<EOF
 184
 185 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 186 {
 187   gld${EMULATION_NAME}_before_parse,
 188   syslib_default,
 189   hll_default,
 190   after_parse_default,
 191   after_open_default,
 192   after_check_relocs_default,
 193   after_allocation_default,
 194   set_output_arch_default,
 195   ldemul_default_target,
 196   gld${EMULATION_NAME}_before_allocation,
 197   gld${EMULATION_NAME}_get_script,
 198   "${EMULATION_NAME}",
 199   "${OUTPUT_FORMAT}",
 200   finish_default,
 201   gld${EMULATION_NAME}_create_output_section_statements,
 202   gld${EMULATION_NAME}_open_dynamic_archive,
 203   NULL, /* place orphan */
 204   NULL, /* set symbols */
 205   NULL, /* parse args */
 206   NULL, /* add_options */
 207   NULL, /* handle_option */
 208   NULL, /* unrecognized file */
 209   NULL, /* list options */
 210   NULL, /* recognized file */
 211   NULL, /* find_potential_libraries */
 212   NULL, /* new_vers_pattern */
 213   NULL, /* extra_map_file_text */
 214   ${LDEMUL_EMIT_CTF_EARLY-NULL},
 215   ${LDEMUL_EXAMINE_STRTAB_FOR_CTF-NULL}
 216 };
 217 EOF