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
  39 #include "ld.h"
  40 #include "ldmain.h"
  41 #include "ldmisc.h"
  42 #include "ldexp.h"
  43 #include "ldlang.h"
  44 #include "ldfile.h"
  45 #include "ldemul.h"
  46
  47 static void
  48 gld${EMULATION_NAME}_before_parse (void)
  49 {
  50   ldfile_set_output_arch ("${OUTPUT_ARCH}", bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`);
  51   input_flags.dynamic = TRUE;
  52   config.has_shared = TRUE;
  53   link_info.check_relocs_after_open_input = TRUE;
  54   link_info.relro = DEFAULT_LD_Z_RELRO;
  55 }
  56
  57 /* Try to open a dynamic archive.  This is where we know that Linux
  58    dynamic libraries have an extension of .sa.  */
  59
  60 static bfd_boolean
  61 gld${EMULATION_NAME}_open_dynamic_archive
  62   (const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
  63 {
  64   char *string;
  65
  66   if (! entry->flags.maybe_archive || entry->flags.full_name_provided)
  67     return FALSE;
  68
  69   string = (char *) xmalloc (strlen (search->name)
  70                              + strlen (entry->filename)
  71                              + strlen (arch)
  72                              + sizeof "/lib.sa");
  73
  74   sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch);
  75
  76   if (! ldfile_try_open_bfd (string, entry))
  77     {
  78       free (string);
  79       return FALSE;
  80     }
  81
  82   entry->filename = string;
  83
  84   return TRUE;
  85 }
  86
  87 /* This is called by the create_output_section_statements routine via
  88    lang_for_each_statement.  It locates any address assignment to
  89    .text, and modifies it to include the size of the headers.  This
  90    causes -Ttext to mean the starting address of the header, rather
  91    than the starting address of .text, which is compatible with other
  92    Linux tools.  */
  93
  94 static void
  95 gld${EMULATION_NAME}_find_address_statement (lang_statement_union_type *s)
  96 {
  97   if (s->header.type == lang_address_statement_enum
  98       && strcmp (s->address_statement.section_name, ".text") == 0)
  99     {
 100       ASSERT (s->address_statement.address->type.node_class == etree_value);
 101       s->address_statement.address->value.value += 0x20;
 102     }
 103 }
 104
 105 /* This is called before opening the input BFD's.  */
 106
 107 static void
 108 gld${EMULATION_NAME}_create_output_section_statements (void)
 109 {
 110   lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement);
 111 }
 112
 113 /* This is called after the sections have been attached to output
 114    sections, but before any sizes or addresses have been set.  */
 115
 116 static void
 117 gld${EMULATION_NAME}_before_allocation (void)
 118 {
 119   if (bfd_link_relocatable (&link_info))
 120     return;
 121
 122   /* Let the backend work out the sizes of any sections required by
 123      dynamic linking.  */
 124   if (! bfd_${EMULATION_NAME}_size_dynamic_sections (link_info.output_bfd,
 125                                                      &link_info))
 126     einfo (_("%F%P: failed to set dynamic section sizes: %E\n"));
 127
 128   before_allocation_default ();
 129 }
 130
 131 static char *
 132 gld${EMULATION_NAME}_get_script (int *isfile)
 133 EOF
 134
 135 if test x"$COMPILE_IN" = xyes
 136 then
 137 # Scripts compiled in.
 138
 139 # sed commands to quote an ld script as a C string.
 140 sc="-f stringify.sed"
 141
 142 fragment <<EOF
 143 {
 144   *isfile = 0;
 145
 146   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 147     return
 148 EOF
 149 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 150 echo '  ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
 151 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 152 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 153 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 154 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 155 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 156 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 157 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 158 echo '; }'                                             >> e${EMULATION_NAME}.c
 159
 160 else
 161 # Scripts read from the filesystem.
 162
 163 fragment <<EOF
 164 {
 165   *isfile = 1;
 166
 167   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 168     return "ldscripts/${EMULATION_NAME}.xu";
 169   else if (bfd_link_relocatable (&link_info))
 170     return "ldscripts/${EMULATION_NAME}.xr";
 171   else if (!config.text_read_only)
 172     return "ldscripts/${EMULATION_NAME}.xbn";
 173   else if (!config.magic_demand_paged)
 174     return "ldscripts/${EMULATION_NAME}.xn";
 175   else
 176     return "ldscripts/${EMULATION_NAME}.x";
 177 }
 178 EOF
 179
 180 fi
 181
 182 fragment <<EOF
 183
 184 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 185 {
 186   gld${EMULATION_NAME}_before_parse,
 187   syslib_default,
 188   hll_default,
 189   after_parse_default,
 190   after_open_default,
 191   after_check_relocs_default,
 192   after_allocation_default,
 193   set_output_arch_default,
 194   ldemul_default_target,
 195   gld${EMULATION_NAME}_before_allocation,
 196   gld${EMULATION_NAME}_get_script,
 197   "${EMULATION_NAME}",
 198   "${OUTPUT_FORMAT}",
 199   finish_default,
 200   gld${EMULATION_NAME}_create_output_section_statements,
 201   gld${EMULATION_NAME}_open_dynamic_archive,
 202   NULL, /* place orphan */
 203   NULL, /* set symbols */
 204   NULL, /* parse args */
 205   NULL, /* add_options */
 206   NULL, /* handle_option */
 207   NULL, /* unrecognized file */
 208   NULL, /* list options */
 209   NULL, /* recognized file */
 210   NULL, /* find_potential_libraries */
 211   NULL, /* new_vers_pattern */
 212   NULL  /* extra_map_file_text */
 213 };
 214 EOF