contrib/binutils/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 cat >e${EMULATION_NAME}.c <<EOF
   9 /* This file is is generated by a shell script.  DO NOT EDIT! */
  10
  11 /* Linux a.out emulation code for ${EMULATION_NAME}
  12    Copyright 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
  13    2003, 2004, 2005, 2007 Free Software Foundation, Inc.
  14    Written by Steve Chamberlain <sac@cygnus.com>
  15    Linux support by Eric Youngdale <ericy@cais.cais.com>
  16
  17 This file is part of GLD, the Gnu Linker.
  18
  19 This program is free software; you can redistribute it and/or modify
  20 it under the terms of the GNU General Public License as published by
  21 the Free Software Foundation; either version 2 of the License, or
  22 (at your option) any later version.
  23
  24 This program is distributed in the hope that it will be useful,
  25 but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 GNU General Public License for more details.
  28
  29 You should have received a copy of the GNU General Public License
  30 along with this program; if not, write to the Free Software
  31 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  32
  33 #define TARGET_IS_${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 ${ARCH} | sed -e 's/:.*//'`);
  51   config.dynamic_link = TRUE;
  52   config.has_shared = TRUE;
  53 }
  54
  55 /* Try to open a dynamic archive.  This is where we know that Linux
  56    dynamic libraries have an extension of .sa.  */
  57
  58 static bfd_boolean
  59 gld${EMULATION_NAME}_open_dynamic_archive
  60   (const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
  61 {
  62   char *string;
  63
  64   if (! entry->is_archive)
  65     return FALSE;
  66
  67   string = (char *) xmalloc (strlen (search->name)
  68                              + strlen (entry->filename)
  69                              + strlen (arch)
  70                              + sizeof "/lib.sa");
  71
  72   sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch);
  73
  74   if (! ldfile_try_open_bfd (string, entry))
  75     {
  76       free (string);
  77       return FALSE;
  78     }
  79
  80   entry->filename = string;
  81
  82   return TRUE;
  83 }
  84
  85 /* This is called by the create_output_section_statements routine via
  86    lang_for_each_statement.  It locates any address assignment to
  87    .text, and modifies it to include the size of the headers.  This
  88    causes -Ttext to mean the starting address of the header, rather
  89    than the starting address of .text, which is compatible with other
  90    Linux tools.  */
  91
  92 static void
  93 gld${EMULATION_NAME}_find_address_statement (lang_statement_union_type *s)
  94 {
  95   if (s->header.type == lang_address_statement_enum
  96       && strcmp (s->address_statement.section_name, ".text") == 0)
  97     {
  98       ASSERT (s->address_statement.address->type.node_class == etree_value);
  99       s->address_statement.address->value.value += 0x20;
 100     }
 101 }
 102
 103 /* This is called before opening the input BFD's.  */
 104
 105 static void
 106 gld${EMULATION_NAME}_create_output_section_statements (void)
 107 {
 108   lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement);
 109 }
 110
 111 /* This is called after the sections have been attached to output
 112    sections, but before any sizes or addresses have been set.  */
 113
 114 static void
 115 gld${EMULATION_NAME}_before_allocation (void)
 116 {
 117   if (link_info.relocatable)
 118     return;
 119
 120   /* Let the backend work out the sizes of any sections required by
 121      dynamic linking.  */
 122   if (! bfd_${EMULATION_NAME}_size_dynamic_sections (output_bfd, &link_info))
 123     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
 124
 125   before_allocation_default ();
 126 }
 127
 128 static char *
 129 gld${EMULATION_NAME}_get_script (int *isfile)
 130 EOF
 131
 132 if test -n "$COMPILE_IN"
 133 then
 134 # Scripts compiled in.
 135
 136 # sed commands to quote an ld script as a C string.
 137 sc="-f stringify.sed"
 138
 139 cat >>e${EMULATION_NAME}.c <<EOF
 140 {
 141   *isfile = 0;
 142
 143   if (link_info.relocatable && config.build_constructors)
 144     return
 145 EOF
 146 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 147 echo '  ; else if (link_info.relocatable) return'     >> e${EMULATION_NAME}.c
 148 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 149 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 150 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 151 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 152 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 153 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 154 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 155 echo '; }'                                             >> e${EMULATION_NAME}.c
 156
 157 else
 158 # Scripts read from the filesystem.
 159
 160 cat >>e${EMULATION_NAME}.c <<EOF
 161 {
 162   *isfile = 1;
 163
 164   if (link_info.relocatable && config.build_constructors)
 165     return "ldscripts/${EMULATION_NAME}.xu";
 166   else if (link_info.relocatable)
 167     return "ldscripts/${EMULATION_NAME}.xr";
 168   else if (!config.text_read_only)
 169     return "ldscripts/${EMULATION_NAME}.xbn";
 170   else if (!config.magic_demand_paged)
 171     return "ldscripts/${EMULATION_NAME}.xn";
 172   else
 173     return "ldscripts/${EMULATION_NAME}.x";
 174 }
 175 EOF
 176
 177 fi
 178
 179 cat >>e${EMULATION_NAME}.c <<EOF
 180
 181 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 182 {
 183   gld${EMULATION_NAME}_before_parse,
 184   syslib_default,
 185   hll_default,
 186   after_parse_default,
 187   after_open_default,
 188   after_allocation_default,
 189   set_output_arch_default,
 190   ldemul_default_target,
 191   gld${EMULATION_NAME}_before_allocation,
 192   gld${EMULATION_NAME}_get_script,
 193   "${EMULATION_NAME}",
 194   "${OUTPUT_FORMAT}",
 195   finish_default,
 196   gld${EMULATION_NAME}_create_output_section_statements,
 197   gld${EMULATION_NAME}_open_dynamic_archive,
 198   NULL, /* place orphan */
 199   NULL, /* set symbols */
 200   NULL, /* parse args */
 201   NULL, /* add_options */
 202   NULL, /* handle_option */
 203   NULL, /* unrecognized file */
 204   NULL, /* list options */
 205   NULL, /* recognized file */
 206   NULL, /* find_potential_libraries */
 207   NULL  /* new_vers_pattern */
 208 };
 209 EOF