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 ${EMULATION_NAME}
  12    Copyright 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2002, 2003
  13    Free Software Foundation, Inc.
  14    Written by Steve Chamberlain <sac@cygnus.com>
  15    Linux support by Eric Youngdale <ericy@cais.cais.com>
  16
  17 This file is part of GLD, the Gnu Linker.
  18
  19 This program is free software; you can redistribute it and/or modify
  20 it under the terms of the GNU General Public License as published by
  21 the Free Software Foundation; either version 2 of the License, or
  22 (at your option) any later version.
  23
  24 This program is distributed in the hope that it will be useful,
  25 but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 GNU General Public License for more details.
  28
  29 You should have received a copy of the GNU General Public License
  30 along with this program; if not, write to the Free Software
  31 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  32
  33 #define TARGET_IS_${EMULATION_NAME}
  34
  35 #include "bfd.h"
  36 #include "sysdep.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${EMULATION_NAME}_before_parse (void)
  49 {
  50   const bfd_arch_info_type *arch = bfd_scan_arch ("${OUTPUT_ARCH}");
  51   if (arch)
  52     {
  53       ldfile_output_architecture = arch->arch;
  54       ldfile_output_machine = arch->mach;
  55       ldfile_output_machine_name = arch->printable_name;
  56     }
  57   else
  58     ldfile_output_architecture = bfd_arch_${ARCH};
  59   config.dynamic_link = TRUE;
  60   config.has_shared = TRUE;
  61 }
  62
  63 /* Try to open a dynamic archive.  This is where we know that Linux
  64    dynamic libraries have an extension of .sa.  */
  65
  66 static bfd_boolean
  67 gld${EMULATION_NAME}_open_dynamic_archive
  68   (const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
  69 {
  70   char *string;
  71
  72   if (! entry->is_archive)
  73     return FALSE;
  74
  75   string = (char *) xmalloc (strlen (search->name)
  76                              + strlen (entry->filename)
  77                              + strlen (arch)
  78                              + sizeof "/lib.sa");
  79
  80   sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch);
  81
  82   if (! ldfile_try_open_bfd (string, entry))
  83     {
  84       free (string);
  85       return FALSE;
  86     }
  87
  88   entry->filename = string;
  89
  90   return TRUE;
  91 }
  92
  93 /* This is called by the create_output_section_statements routine via
  94    lang_for_each_statement.  It locates any address assignment to
  95    .text, and modifies it to include the size of the headers.  This
  96    causes -Ttext to mean the starting address of the header, rather
  97    than the starting address of .text, which is compatible with other
  98    Linux tools.  */
  99
 100 static void
 101 gld${EMULATION_NAME}_find_address_statement (lang_statement_union_type *s)
 102 {
 103   if (s->header.type == lang_address_statement_enum
 104       && strcmp (s->address_statement.section_name, ".text") == 0)
 105     {
 106       ASSERT (s->address_statement.address->type.node_class == etree_value);
 107       s->address_statement.address->value.value += 0x20;
 108     }
 109 }
 110
 111 /* This is called before opening the input BFD's.  */
 112
 113 static void
 114 gld${EMULATION_NAME}_create_output_section_statements (void)
 115 {
 116   lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement);
 117 }
 118
 119 /* This is called after the sections have been attached to output
 120    sections, but before any sizes or addresses have been set.  */
 121
 122 static void
 123 gld${EMULATION_NAME}_before_allocation (void)
 124 {
 125   if (link_info.relocatable)
 126     return;
 127
 128   /* Let the backend work out the sizes of any sections required by
 129      dynamic linking.  */
 130   if (! bfd_${EMULATION_NAME}_size_dynamic_sections (output_bfd, &link_info))
 131     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
 132 }
 133
 134 static char *
 135 gld${EMULATION_NAME}_get_script (int *isfile)
 136 EOF
 137
 138 if test -n "$COMPILE_IN"
 139 then
 140 # Scripts compiled in.
 141
 142 # sed commands to quote an ld script as a C string.
 143 sc="-f stringify.sed"
 144
 145 cat >>e${EMULATION_NAME}.c <<EOF
 146 {
 147   *isfile = 0;
 148
 149   if (link_info.relocatable && config.build_constructors)
 150     return
 151 EOF
 152 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
 153 echo '  ; else if (link_info.relocatable) return'     >> e${EMULATION_NAME}.c
 154 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
 155 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
 156 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
 157 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
 158 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
 159 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
 160 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 161 echo '; }'                                             >> e${EMULATION_NAME}.c
 162
 163 else
 164 # Scripts read from the filesystem.
 165
 166 cat >>e${EMULATION_NAME}.c <<EOF
 167 {
 168   *isfile = 1;
 169
 170   if (link_info.relocatable && config.build_constructors)
 171     return "ldscripts/${EMULATION_NAME}.xu";
 172   else if (link_info.relocatable)
 173     return "ldscripts/${EMULATION_NAME}.xr";
 174   else if (!config.text_read_only)
 175     return "ldscripts/${EMULATION_NAME}.xbn";
 176   else if (!config.magic_demand_paged)
 177     return "ldscripts/${EMULATION_NAME}.xn";
 178   else
 179     return "ldscripts/${EMULATION_NAME}.x";
 180 }
 181 EOF
 182
 183 fi
 184
 185 cat >>e${EMULATION_NAME}.c <<EOF
 186
 187 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 188 {
 189   gld${EMULATION_NAME}_before_parse,
 190   syslib_default,
 191   hll_default,
 192   after_parse_default,
 193   after_open_default,
 194   after_allocation_default,
 195   set_output_arch_default,
 196   ldemul_default_target,
 197   gld${EMULATION_NAME}_before_allocation,
 198   gld${EMULATION_NAME}_get_script,
 199   "${EMULATION_NAME}",
 200   "${OUTPUT_FORMAT}",
 201   NULL, /* finish */
 202   gld${EMULATION_NAME}_create_output_section_statements,
 203   gld${EMULATION_NAME}_open_dynamic_archive,
 204   NULL, /* place orphan */
 205   NULL, /* set symbols */
 206   NULL, /* parse args */
 207   NULL, /* add_options */
 208   NULL, /* handle_option */
 209   NULL, /* unrecognized file */
 210   NULL, /* list options */
 211   NULL, /* recognized file */
 212   NULL, /* find_potential_libraries */
 213   NULL  /* new_vers_pattern */
 214 };
 215 EOF