ld/mri.c

   1 /* mri.c -- handle MRI style linker scripts
   2    Copyright 1991, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001,
   3    2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
   4
   5 This file is part of GLD, the Gnu Linker.
   6
   7 GLD is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GLD is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GLD; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20 02110-1301, USA.
  21
  22    This bit does the tree decoration when MRI style link scripts
  23    are parsed.
  24
  25    Contributed by Steve Chamberlain <sac@cygnus.com>.  */
  26
  27 #include "sysdep.h"
  28 #include "bfd.h"
  29 #include "ld.h"
  30 #include "ldexp.h"
  31 #include "ldlang.h"
  32 #include "ldmisc.h"
  33 #include "mri.h"
  34 #include <ldgram.h>
  35 #include "libiberty.h"
  36
  37 struct section_name_struct {
  38   struct section_name_struct *next;
  39   const char *name;
  40   const char *alias;
  41   etree_type *vma;
  42   etree_type *align;
  43   etree_type *subalign;
  44   int ok_to_load;
  45 };
  46
  47 static unsigned int symbol_truncate = 10000;
  48 static struct section_name_struct *order;
  49 static struct section_name_struct *only_load;
  50 static struct section_name_struct *address;
  51 static struct section_name_struct *alias;
  52
  53 static struct section_name_struct *alignment;
  54 static struct section_name_struct *subalignment;
  55
  56 static struct section_name_struct **
  57 lookup (const char *name, struct section_name_struct **list)
  58 {
  59   struct section_name_struct **ptr = list;
  60
  61   while (*ptr)
  62     {
  63       if (strcmp (name, (*ptr)->name) == 0)
  64         /* If this is a match, delete it, we only keep the last instance
  65            of any name.  */
  66         *ptr = (*ptr)->next;
  67       else
  68         ptr = &((*ptr)->next);
  69     }
  70
  71   *ptr = xmalloc (sizeof (struct section_name_struct));
  72   return ptr;
  73 }
  74
  75 static void
  76 mri_add_to_list (struct section_name_struct **list,
  77                  const char *name,
  78                  etree_type *vma,
  79                  const char *zalias,
  80                  etree_type *align,
  81                  etree_type *subalign)
  82 {
  83   struct section_name_struct **ptr = lookup (name, list);
  84
  85   (*ptr)->name = name;
  86   (*ptr)->vma = vma;
  87   (*ptr)->next = NULL;
  88   (*ptr)->ok_to_load = 0;
  89   (*ptr)->alias = zalias;
  90   (*ptr)->align = align;
  91   (*ptr)->subalign = subalign;
  92 }
  93
  94 void
  95 mri_output_section (const char *name, etree_type *vma)
  96 {
  97   mri_add_to_list (&address, name, vma, 0, 0, 0);
  98 }
  99
 100 /* If any ABSOLUTE <name> are in the script, only load those files
 101    marked thus.  */
 102
 103 void
 104 mri_only_load (const char *name)
 105 {
 106   mri_add_to_list (&only_load, name, 0, 0, 0, 0);
 107 }
 108
 109 void
 110 mri_base (etree_type *exp)
 111 {
 112   base = exp;
 113 }
 114
 115 static int done_tree = 0;
 116
 117 void
 118 mri_draw_tree (void)
 119 {
 120   if (done_tree)
 121     return;
 122
 123   /* Now build the statements for the ldlang machine.  */
 124
 125   /* Attach the addresses of any which have addresses,
 126      and add the ones not mentioned.  */
 127   if (address != NULL)
 128     {
 129       struct section_name_struct *alist;
 130       struct section_name_struct *olist;
 131
 132       if (order == NULL)
 133         order = address;
 134
 135       for (alist = address;
 136            alist != NULL;
 137            alist = alist->next)
 138         {
 139           int done = 0;
 140
 141           for (olist = order; done == 0 && olist != NULL; olist = olist->next)
 142             {
 143               if (strcmp (alist->name, olist->name) == 0)
 144                 {
 145                   olist->vma = alist->vma;
 146                   done = 1;
 147                 }
 148             }
 149
 150           if (!done)
 151             {
 152               /* Add this onto end of order list.  */
 153               mri_add_to_list (&order, alist->name, alist->vma, 0, 0, 0);
 154             }
 155         }
 156     }
 157
 158   /* If we're only supposed to load a subset of them in, then prune
 159      the list.  */
 160   if (only_load != NULL)
 161     {
 162       struct section_name_struct *ptr1;
 163       struct section_name_struct *ptr2;
 164
 165       if (order == NULL)
 166         order = only_load;
 167
 168       /* See if this name is in the list, if it is then we can load it.  */
 169       for (ptr1 = only_load; ptr1; ptr1 = ptr1->next)
 170         for (ptr2 = order; ptr2; ptr2 = ptr2->next)
 171           if (strcmp (ptr2->name, ptr1->name) == 0)
 172             ptr2->ok_to_load = 1;
 173     }
 174   else
 175     {
 176       /* No only load list, so everything is ok to load.  */
 177       struct section_name_struct *ptr;
 178
 179       for (ptr = order; ptr; ptr = ptr->next)
 180         ptr->ok_to_load = 1;
 181     }
 182
 183   /* Create the order of sections to load.  */
 184   if (order != NULL)
 185     {
 186       /* Been told to output the sections in a certain order.  */
 187       struct section_name_struct *p = order;
 188
 189       while (p)
 190         {
 191           struct section_name_struct *aptr;
 192           etree_type *align = 0;
 193           etree_type *subalign = 0;
 194           struct wildcard_list *tmp;
 195
 196           /* See if an alignment has been specified.  */
 197           for (aptr = alignment; aptr; aptr = aptr->next)
 198             if (strcmp (aptr->name, p->name) == 0)
 199               align = aptr->align;
 200
 201           for (aptr = subalignment; aptr; aptr = aptr->next)
 202             if (strcmp (aptr->name, p->name) == 0)
 203               subalign = aptr->subalign;
 204
 205           if (base == 0)
 206             base = p->vma ? p->vma : exp_nameop (NAME, ".");
 207
 208           lang_enter_output_section_statement (p->name, base,
 209                                                p->ok_to_load ? 0 : noload_section,
 210                                                align, subalign, NULL, 0);
 211           base = 0;
 212           tmp = xmalloc (sizeof *tmp);
 213           tmp->next = NULL;
 214           tmp->spec.name = p->name;
 215           tmp->spec.exclude_name_list = NULL;
 216           tmp->spec.sorted = none;
 217           lang_add_wild (NULL, tmp, FALSE);
 218
 219           /* If there is an alias for this section, add it too.  */
 220           for (aptr = alias; aptr; aptr = aptr->next)
 221             if (strcmp (aptr->alias, p->name) == 0)
 222               {
 223                 tmp = xmalloc (sizeof *tmp);
 224                 tmp->next = NULL;
 225                 tmp->spec.name = aptr->name;
 226                 tmp->spec.exclude_name_list = NULL;
 227                 tmp->spec.sorted = none;
 228                 lang_add_wild (NULL, tmp, FALSE);
 229               }
 230
 231           lang_leave_output_section_statement (0, "*default*", NULL, NULL);
 232
 233           p = p->next;
 234         }
 235     }
 236
 237   done_tree = 1;
 238 }
 239
 240 void
 241 mri_load (const char *name)
 242 {
 243   base = 0;
 244   lang_add_input_file (name, lang_input_file_is_file_enum, NULL);
 245 }
 246
 247 void
 248 mri_order (const char *name)
 249 {
 250   mri_add_to_list (&order, name, 0, 0, 0, 0);
 251 }
 252
 253 void
 254 mri_alias (const char *want, const char *is, int isn)
 255 {
 256   if (!is)
 257     {
 258       char buf[20];
 259
 260       /* Some sections are digits.  */
 261       sprintf (buf, "%d", isn);
 262
 263       is = xstrdup (buf);
 264
 265       if (is == NULL)
 266         abort ();
 267     }
 268
 269   mri_add_to_list (&alias, is, 0, want, 0, 0);
 270 }
 271
 272 void
 273 mri_name (const char *name)
 274 {
 275   lang_add_output (name, 1);
 276 }
 277
 278 void
 279 mri_format (const char *name)
 280 {
 281   if (strcmp (name, "S") == 0)
 282     lang_add_output_format ("srec", NULL, NULL, 1);
 283
 284   else if (strcmp (name, "IEEE") == 0)
 285     lang_add_output_format ("ieee", NULL, NULL, 1);
 286
 287   else if (strcmp (name, "COFF") == 0)
 288     lang_add_output_format ("coff-m68k", NULL, NULL, 1);
 289
 290   else
 291     einfo (_("%P%F: unknown format type %s\n"), name);
 292 }
 293
 294 void
 295 mri_public (const char *name, etree_type *exp)
 296 {
 297   lang_add_assignment (exp_assop ('=', name, exp));
 298 }
 299
 300 void
 301 mri_align (const char *name, etree_type *exp)
 302 {
 303   mri_add_to_list (&alignment, name, 0, 0, exp, 0);
 304 }
 305
 306 void
 307 mri_alignmod (const char *name, etree_type *exp)
 308 {
 309   mri_add_to_list (&subalignment, name, 0, 0, 0, exp);
 310 }
 311
 312 void
 313 mri_truncate (unsigned int exp)
 314 {
 315   symbol_truncate = exp;
 316 }