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 ${EMULATION_NAME}
  12    Copyright 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
  13    2003, 2004, 2005, 2007 Free Software Foundation, Inc.
  14    Written by Steve Chamberlain <sac@cygnus.com>
  15    Linux support by Eric Youngdale <ericy@cais.cais.com>
  16
  17    This file is part of the GNU Binutils.
  18
  19    This program is free software; you can redistribute it and/or modify
  20    it under the terms of the GNU General Public License as published by
  21    the Free Software Foundation; either version 3 of the License, or
  22    (at your option) any later version.
  23
  24    This program is distributed in the hope that it will be useful,
  25    but WITHOUT ANY WARRANTY; without even the implied warranty of
  26    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27    GNU General Public License for more details.
  28
  29    You should have received a copy of the GNU General Public License
  30    along with this program; if not, write to the Free Software
  31    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  32    MA 02110-1301, USA.  */
  33
  34 #define TARGET_IS_${EMULATION_NAME}
  35
  36 #include "sysdep.h"
  37 #include "bfd.h"
  38 #include "bfdlink.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 ${ARCH} | sed -e 's/:.*//'`);
  52   config.dynamic_link = TRUE;
  53   config.has_shared = TRUE;
  54 }
  55
  56 /* Try to open a dynamic archive.  This is where we know that Linux
  57    dynamic libraries have an extension of .sa.  */
  58
  59 static bfd_boolean
  60 gld${EMULATION_NAME}_open_dynamic_archive
  61   (const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
  62 {
  63   char *string;
  64
  65   if (! entry->is_archive)
  66     return FALSE;
  67
  68   string = (char *) xmalloc (strlen (search->name)
  69                              + strlen (entry->filename)
  70                              + strlen (arch)
  71                              + sizeof "/lib.sa");
  72
  73   sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch);
  74
  75   if (! ldfile_try_open_bfd (string, entry))
  76     {
  77       free (string);
  78       return FALSE;
  79     }
  80
  81   entry->filename = string;
  82
  83   return TRUE;
  84 }
  85
  86 /* This is called by the create_output_section_statements routine via
  87    lang_for_each_statement.  It locates any address assignment to
  88    .text, and modifies it to include the size of the headers.  This
  89    causes -Ttext to mean the starting address of the header, rather
  90    than the starting address of .text, which is compatible with other
  91    Linux tools.  */
  92
  93 static void
  94 gld${EMULATION_NAME}_find_address_statement (lang_statement_union_type *s)
  95 {
  96   if (s->header.type == lang_address_statement_enum
  97       && strcmp (s->address_statement.section_name, ".text") == 0)
  98     {
  99       ASSERT (s->address_statement.address->type.node_class == etree_value);
 100       s->address_statement.address->value.value += 0x20;
 101     }
 102 }
 103
 104 /* This is called before opening the input BFD's.  */
 105
 106 static void
 107 gld${EMULATION_NAME}_create_output_section_statements (void)
 108 {
 109   lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement);
 110 }
 111
 112 /* This is called after the sections have been attached to output
 113    sections, but before any sizes or addresses have been set.  */
 114
 115 static void
 116 gld${EMULATION_NAME}_before_allocation (void)
 117 {
 118   if (link_info.relocatable)
 119     return;
 120
 121   /* Let the backend work out the sizes of any sections required by
 122      dynamic linking.  */
 123   if (! bfd_${EMULATION_NAME}_size_dynamic_sections (output_bfd, &link_info))
 124     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
 125
 126   before_allocation_default ();
 127 }
 128
 129 static char *
 130 gld${EMULATION_NAME}_get_script (int *isfile)
 131 EOF
 132
 133 if test -n "$COMPILE_IN"
 134 then
 135 # Scripts compiled in.
 136
 137 # sed commands to quote an ld script as a C string.
 138 sc="-f stringify.sed"
 139
 140 fragment <<EOF
 141 {
 142   *isfile = 0;
 143
 144   if (link_info.relocatable && config.build_constructors)
 145     return
 146 EOF
 147 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 148 echo '  ; else if (link_info.relocatable) return'     >> e${EMULATION_NAME}.c
 149 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 150 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 151 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 152 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 153 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 154 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 155 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 156 echo '; }'                                             >> e${EMULATION_NAME}.c
 157
 158 else
 159 # Scripts read from the filesystem.
 160
 161 fragment <<EOF
 162 {
 163   *isfile = 1;
 164
 165   if (link_info.relocatable && config.build_constructors)
 166     return "ldscripts/${EMULATION_NAME}.xu";
 167   else if (link_info.relocatable)
 168     return "ldscripts/${EMULATION_NAME}.xr";
 169   else if (!config.text_read_only)
 170     return "ldscripts/${EMULATION_NAME}.xbn";
 171   else if (!config.magic_demand_paged)
 172     return "ldscripts/${EMULATION_NAME}.xn";
 173   else
 174     return "ldscripts/${EMULATION_NAME}.x";
 175 }
 176 EOF
 177
 178 fi
 179
 180 fragment <<EOF
 181
 182 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 183 {
 184   gld${EMULATION_NAME}_before_parse,
 185   syslib_default,
 186   hll_default,
 187   after_parse_default,
 188   after_open_default,
 189   after_allocation_default,
 190   set_output_arch_default,
 191   ldemul_default_target,
 192   gld${EMULATION_NAME}_before_allocation,
 193   gld${EMULATION_NAME}_get_script,
 194   "${EMULATION_NAME}",
 195   "${OUTPUT_FORMAT}",
 196   finish_default,
 197   gld${EMULATION_NAME}_create_output_section_statements,
 198   gld${EMULATION_NAME}_open_dynamic_archive,
 199   NULL, /* place orphan */
 200   NULL, /* set symbols */
 201   NULL, /* parse args */
 202   NULL, /* add_options */
 203   NULL, /* handle_option */
 204   NULL, /* unrecognized file */
 205   NULL, /* list options */
 206   NULL, /* recognized file */
 207   NULL, /* find_potential_libraries */
 208   NULL  /* new_vers_pattern */
 209 };
 210 EOF