ld/emultempl/msp430.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 fragment <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* Emulate the original gld for the given ${EMULATION_NAME}
   7    Copyright (C) 2014-2016 Free Software Foundation, Inc.
   8    Written by Steve Chamberlain steve@cygnus.com
   9    Extended for the MSP430 by Nick Clifton  nickc@redhat.com
  10
  11    This file is part of the GNU Binutils.
  12
  13    This program is free software; you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation; either version 3 of the License, or
  16    (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program; if not, write to the Free Software
  25    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  26    MA 02110-1301, USA.  */
  27
  28 #define TARGET_IS_${EMULATION_NAME}
  29
  30 #include "sysdep.h"
  31 #include "bfd.h"
  32 #include "bfdlink.h"
  33
  34 #include "ld.h"
  35 #include "ldmain.h"
  36 #include "ldmisc.h"
  37 #include "ldexp.h"
  38 #include "ldlang.h"
  39 #include "ldfile.h"
  40 #include "ldemul.h"
  41 #include "libiberty.h"
  42
  43 EOF
  44
  45 # Import any needed special functions and/or overrides.
  46 #
  47 if test -n "$EXTRA_EM_FILE" ; then
  48   source_em ${srcdir}/emultempl/${EXTRA_EM_FILE}.em
  49 fi
  50
  51 if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then
  52 fragment <<EOF
  53
  54 static void
  55 gld${EMULATION_NAME}_before_parse (void)
  56 {
  57 #ifndef TARGET_                 /* I.e., if not generic.  */
  58   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  59 #endif /* not TARGET_ */
  60
  61   /* The MSP430 port *needs* linker relaxtion in order to cope with large
  62      functions where conditional branches do not fit into a +/- 1024 byte range.  */
  63   if (!bfd_link_relocatable (&link_info))
  64     TARGET_ENABLE_RELAXATION;
  65 }
  66
  67 EOF
  68 fi
  69
  70 if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then
  71 fragment <<EOF
  72
  73 static char *
  74 gld${EMULATION_NAME}_get_script (int *isfile)
  75 EOF
  76
  77 if test x"$COMPILE_IN" = xyes
  78 then
  79 # Scripts compiled in.
  80
  81 # sed commands to quote an ld script as a C string.
  82 sc="-f stringify.sed"
  83
  84 fragment <<EOF
  85 {
  86   *isfile = 0;
  87
  88   if (bfd_link_relocatable (&link_info) && config.build_constructors)
  89     return
  90 EOF
  91 sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
  92 echo '  ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
  93 sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
  94 echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
  95 sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
  96 echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
  97 sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
  98 echo '  ; else return'                                 >> e${EMULATION_NAME}.c
  99 sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
 100 echo '; }'                                             >> e${EMULATION_NAME}.c
 101
 102 else
 103 # Scripts read from the filesystem.
 104
 105 fragment <<EOF
 106 {
 107   *isfile = 1;
 108
 109   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 110     return "ldscripts/${EMULATION_NAME}.xu";
 111   else if (bfd_link_relocatable (&link_info))
 112     return "ldscripts/${EMULATION_NAME}.xr";
 113   else if (!config.text_read_only)
 114     return "ldscripts/${EMULATION_NAME}.xbn";
 115   else if (!config.magic_demand_paged)
 116     return "ldscripts/${EMULATION_NAME}.xn";
 117   else
 118     return "ldscripts/${EMULATION_NAME}.x";
 119 }
 120 EOF
 121 fi
 122 fi
 123
 124 if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then
 125 fragment <<EOF
 126
 127 /* Helper function for place_orphan that computes the size
 128    of sections already mapped to the given statement.  */
 129
 130 static bfd_size_type
 131 scan_children (lang_statement_union_type * l)
 132 {
 133   bfd_size_type amount = 0;
 134
 135   while (l != NULL)
 136     {
 137       switch (l->header.type)
 138         {
 139         case lang_input_section_enum:
 140           if (l->input_section.section->flags & SEC_ALLOC)
 141             amount += l->input_section.section->size;
 142           break;
 143
 144         case lang_constructors_statement_enum:
 145         case lang_assignment_statement_enum:
 146           break;
 147
 148         case lang_wild_statement_enum:
 149           amount += scan_children (l->wild_statement.children.head);
 150           break;
 151
 152         default:
 153           fprintf (stderr, "msp430 orphan placer: unhandled lang type %d\n", l->header.type);
 154           break;
 155         }
 156
 157       l = l->header.next;
 158     }
 159
 160   return amount;
 161 }
 162
 163 /* Place an orphan section.  We use this to put .either sections
 164    into either their lower or their upper equivalents.  */
 165
 166 static lang_output_section_statement_type *
 167 gld${EMULATION_NAME}_place_orphan (asection * s,
 168                                    const char * secname,
 169                                    int constraint)
 170 {
 171   char * lower_name;
 172   char * upper_name;
 173   char * name;
 174   char * buf = NULL;
 175   lang_output_section_statement_type * lower;
 176   lang_output_section_statement_type * upper;
 177   lang_output_section_statement_type * os;
 178
 179   if ((s->flags & SEC_ALLOC) == 0)
 180     return NULL;
 181
 182   if (bfd_link_relocatable (&link_info))
 183     return NULL;
 184
 185   /* If constraints are involved let the linker handle the placement normally.  */
 186   if (constraint != 0)
 187     return NULL;
 188
 189   /* We only need special handling for .either sections.  */
 190   if (strncmp (secname, ".either.", 8) != 0)
 191     return NULL;
 192
 193   /* Skip the .either prefix.  */
 194   secname += 7;
 195
 196   /* Compute the names of the corresponding upper and lower
 197      sections.  If the input section name contains another period,
 198      only use the part of the name before the second dot.  */
 199   if (strchr (secname + 1, '.') != NULL)
 200     {
 201       buf = name = xstrdup (secname);
 202
 203       * strchr (name + 1, '.') = 0;
 204     }
 205   else
 206     name = (char *) secname;
 207
 208   lower_name = concat (".lower", name, NULL);
 209   upper_name = concat (".upper", name, NULL);
 210
 211   /* Find the corresponding lower and upper sections.  */
 212   lower = lang_output_section_find (lower_name);
 213   upper = lang_output_section_find (upper_name);
 214   /* If the upper section does not exist, try again without the suffix.  */
 215   if (upper == NULL)
 216     upper = lang_output_section_find (name);
 217
 218   if (lower == NULL)
 219     {
 220       os = upper;
 221       if (upper == NULL)
 222         {
 223           einfo ("%P: error: no section named %s or %s in linker script\n", lower_name, upper_name);
 224           goto end;
 225         }
 226     }
 227   else if (upper == NULL)
 228     os = lower;
 229   else if (lower->region == NULL)
 230     os = lower;
 231   /* If the section is too big for the region containing
 232      the lower section then do not even try to use it.  */
 233   else if (lower->region->length < s->size)
 234     os = upper;
 235   else
 236     {
 237       bfd_size_type amount = 0;
 238       struct lang_output_section_statement_struct * p;
 239
 240       amount += scan_children (lower->children.head);
 241
 242       /* Also check forwards for other statements assigned to the same region.  */
 243       for (p = lower->next; p != NULL; p = p->next)
 244         if (p->region == lower->region)
 245           amount += scan_children (p->children.head);
 246
 247       /* Scan backwards as well.  */
 248       for (p = lower->prev; p != NULL; p = p->prev)
 249         if (p->region == lower->region)
 250           amount += scan_children (p->children.head);
 251
 252       if (amount + s->size >= lower->region->length)
 253         os = upper;
 254       else
 255         os = lower;
 256     }
 257
 258   lang_add_section (& os->children, s, NULL, os);
 259  end:
 260   free (upper_name);
 261   free (lower_name);
 262   if (buf)
 263     free (buf);
 264   return os;
 265 }
 266 EOF
 267 fi
 268
 269 fragment <<EOF
 270
 271 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 272 {
 273   ${LDEMUL_BEFORE_PARSE-gld${EMULATION_NAME}_before_parse},
 274   ${LDEMUL_SYSLIB-syslib_default},
 275   ${LDEMUL_HLL-hll_default},
 276   ${LDEMUL_AFTER_PARSE-after_parse_default},
 277   ${LDEMUL_AFTER_OPEN-after_open_default},
 278   ${LDEMUL_AFTER_ALLOCATION-after_allocation_default},
 279   ${LDEMUL_SET_OUTPUT_ARCH-set_output_arch_default},
 280   ${LDEMUL_CHOOSE_TARGET-ldemul_default_target},
 281   ${LDEMUL_BEFORE_ALLOCATION-before_allocation_default},
 282   ${LDEMUL_GET_SCRIPT-gld${EMULATION_NAME}_get_script},
 283   "${EMULATION_NAME}",
 284   "${OUTPUT_FORMAT}",
 285   ${LDEMUL_FINISH-finish_default},
 286   ${LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS-NULL},
 287   ${LDEMUL_OPEN_DYNAMIC_ARCHIVE-NULL},
 288   ${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan},
 289   ${LDEMUL_SET_SYMBOLS-NULL},
 290   ${LDEMUL_PARSE_ARGS-NULL},
 291   ${LDEMUL_ADD_OPTIONS-NULL},
 292   ${LDEMUL_HANDLE_OPTION-NULL},
 293   ${LDEMUL_UNRECOGNIZED_FILE-NULL},
 294   ${LDEMUL_LIST_OPTIONS-NULL},
 295   ${LDEMUL_RECOGNIZED_FILE-NULL},
 296   ${LDEMUL_FIND_POTENTIAL_LIBRARIES-NULL},
 297   ${LDEMUL_NEW_VERS_PATTERN-NULL},
 298   ${LDEMUL_EXTRA_MAP_FILE_TEXT-NULL}
 299 };
 300 EOF
 301 # \f
 302 # Local Variables:
 303 # mode: c
 304 # End: