ld/mri.c

   1 /* mri.c -- handle MRI style linker scripts
   2    Copyright (C) 1991-2019 Free Software Foundation, Inc.
   3    Contributed by Steve Chamberlain <sac@cygnus.com>.
   4
   5    This file is part of the GNU Binutils.
   6
   7    This program 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 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program 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 this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22
  23 /* This bit does the tree decoration when MRI style link scripts
  24    are parsed.  */
  25
  26 #include "sysdep.h"
  27 #include "bfd.h"
  28 #include "bfdlink.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 etree_type *base; /* Relocation base - or null */
  49
  50 static struct section_name_struct *order;
  51 static struct section_name_struct *only_load;
  52 static struct section_name_struct *address;
  53 static struct section_name_struct *alias;
  54
  55 static struct section_name_struct *alignment;
  56 static struct section_name_struct *subalignment;
  57
  58 static struct section_name_struct **
  59 lookup (const char *name, struct section_name_struct **list)
  60 {
  61   struct section_name_struct **ptr = list;
  62
  63   while (*ptr)
  64     {
  65       if (strcmp (name, (*ptr)->name) == 0)
  66         /* If this is a match, delete it, we only keep the last instance
  67            of any name.  */
  68         *ptr = (*ptr)->next;
  69       else
  70         ptr = &((*ptr)->next);
  71     }
  72
  73   *ptr = (struct section_name_struct *)
  74       xmalloc (sizeof (struct section_name_struct));
  75   return ptr;
  76 }
  77
  78 static void
  79 mri_add_to_list (struct section_name_struct **list,
  80                  const char *name,
  81                  etree_type *vma,
  82                  const char *zalias,
  83                  etree_type *align,
  84                  etree_type *subalign)
  85 {
  86   struct section_name_struct **ptr = lookup (name, list);
  87
  88   (*ptr)->name = name;
  89   (*ptr)->vma = vma;
  90   (*ptr)->next = NULL;
  91   (*ptr)->ok_to_load = 0;
  92   (*ptr)->alias = zalias;
  93   (*ptr)->align = align;
  94   (*ptr)->subalign = subalign;
  95 }
  96
  97 void
  98 mri_output_section (const char *name, etree_type *vma)
  99 {
 100   mri_add_to_list (&address, name, vma, 0, 0, 0);
 101 }
 102
 103 /* If any ABSOLUTE <name> are in the script, only load those files
 104    marked thus.  */
 105
 106 void
 107 mri_only_load (const char *name)
 108 {
 109   mri_add_to_list (&only_load, name, 0, 0, 0, 0);
 110 }
 111
 112 void
 113 mri_base (etree_type *exp)
 114 {
 115   base = exp;
 116 }
 117
 118 static int done_tree = 0;
 119
 120 void
 121 mri_draw_tree (void)
 122 {
 123   if (done_tree)
 124     return;
 125
 126   /* Now build the statements for the ldlang machine.  */
 127
 128   /* Attach the addresses of any which have addresses,
 129      and add the ones not mentioned.  */
 130   if (address != NULL)
 131     {
 132       struct section_name_struct *alist;
 133       struct section_name_struct *olist;
 134
 135       if (order == NULL)
 136         order = address;
 137
 138       for (alist = address;
 139            alist != NULL;
 140            alist = alist->next)
 141         {
 142           int done = 0;
 143
 144           for (olist = order; done == 0 && olist != NULL; olist = olist->next)
 145             {
 146               if (strcmp (alist->name, olist->name) == 0)
 147                 {
 148                   olist->vma = alist->vma;
 149                   done = 1;
 150                 }
 151             }
 152
 153           if (!done)
 154             {
 155               /* Add this onto end of order list.  */
 156               mri_add_to_list (&order, alist->name, alist->vma, 0, 0, 0);
 157             }
 158         }
 159     }
 160
 161   /* If we're only supposed to load a subset of them in, then prune
 162      the list.  */
 163   if (only_load != NULL)
 164     {
 165       struct section_name_struct *ptr1;
 166       struct section_name_struct *ptr2;
 167
 168       if (order == NULL)
 169         order = only_load;
 170
 171       /* See if this name is in the list, if it is then we can load it.  */
 172       for (ptr1 = only_load; ptr1; ptr1 = ptr1->next)
 173         for (ptr2 = order; ptr2; ptr2 = ptr2->next)
 174           if (strcmp (ptr2->name, ptr1->name) == 0)
 175             ptr2->ok_to_load = 1;
 176     }
 177   else
 178     {
 179       /* No only load list, so everything is ok to load.  */
 180       struct section_name_struct *ptr;
 181
 182       for (ptr = order; ptr; ptr = ptr->next)
 183         ptr->ok_to_load = 1;
 184     }
 185
 186   /* Create the order of sections to load.  */
 187   if (order != NULL)
 188     {
 189       /* Been told to output the sections in a certain order.  */
 190       struct section_name_struct *p = order;
 191
 192       while (p)
 193         {
 194           struct section_name_struct *aptr;
 195           etree_type *align = 0;
 196           etree_type *subalign = 0;
 197           struct wildcard_list *tmp;
 198
 199           /* See if an alignment has been specified.  */
 200           for (aptr = alignment; aptr; aptr = aptr->next)
 201             if (strcmp (aptr->name, p->name) == 0)
 202               align = aptr->align;
 203
 204           for (aptr = subalignment; aptr; aptr = aptr->next)
 205             if (strcmp (aptr->name, p->name) == 0)
 206               subalign = aptr->subalign;
 207
 208           if (base == 0)
 209             base = p->vma ? p->vma : exp_nameop (NAME, ".");
 210
 211           lang_enter_output_section_statement (p->name, base,
 212                                                p->ok_to_load ? normal_section : noload_section,
 213                                                align, subalign, NULL, 0, 0);
 214           base = 0;
 215           tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 216           tmp->next = NULL;
 217           tmp->spec.name = p->name;
 218           tmp->spec.exclude_name_list = NULL;
 219           tmp->spec.sorted = none;
 220           tmp->spec.section_flag_list = NULL;
 221           lang_add_wild (NULL, tmp, FALSE);
 222
 223           /* If there is an alias for this section, add it too.  */
 224           for (aptr = alias; aptr; aptr = aptr->next)
 225             if (strcmp (aptr->alias, p->name) == 0)
 226               {
 227                 tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 228                 tmp->next = NULL;
 229                 tmp->spec.name = aptr->name;
 230                 tmp->spec.exclude_name_list = NULL;
 231                 tmp->spec.sorted = none;
 232                 tmp->spec.section_flag_list = NULL;
 233                 lang_add_wild (NULL, tmp, FALSE);
 234               }
 235
 236           lang_leave_output_section_statement (0, "*default*", NULL, NULL);
 237
 238           p = p->next;
 239         }
 240     }
 241
 242   done_tree = 1;
 243 }
 244
 245 void
 246 mri_load (const char *name)
 247 {
 248   base = 0;
 249   lang_add_input_file (name, lang_input_file_is_file_enum, NULL);
 250 }
 251
 252 void
 253 mri_order (const char *name)
 254 {
 255   mri_add_to_list (&order, name, 0, 0, 0, 0);
 256 }
 257
 258 void
 259 mri_alias (const char *want, const char *is, int isn)
 260 {
 261   if (!is)
 262     {
 263       char buf[20];
 264
 265       /* Some sections are digits.  */
 266       sprintf (buf, "%d", isn);
 267
 268       is = xstrdup (buf);
 269
 270       if (is == NULL)
 271         abort ();
 272     }
 273
 274   mri_add_to_list (&alias, is, 0, want, 0, 0);
 275 }
 276
 277 void
 278 mri_name (const char *name)
 279 {
 280   lang_add_output (name, 1);
 281 }
 282
 283 void
 284 mri_format (const char *name)
 285 {
 286   if (strcmp (name, "S") == 0)
 287     lang_add_output_format ("srec", NULL, NULL, 1);
 288
 289   else
 290     einfo (_("%F%P: unknown format type %s\n"), name);
 291 }
 292
 293 void
 294 mri_public (const char *name, etree_type *exp)
 295 {
 296   lang_add_assignment (exp_assign (name, exp, FALSE));
 297 }
 298
 299 void
 300 mri_align (const char *name, etree_type *exp)
 301 {
 302   mri_add_to_list (&alignment, name, 0, 0, exp, 0);
 303 }
 304
 305 void
 306 mri_alignmod (const char *name, etree_type *exp)
 307 {
 308   mri_add_to_list (&subalignment, name, 0, 0, 0, exp);
 309 }
 310
 311 void
 312 mri_truncate (unsigned int exp)
 313 {
 314   symbol_truncate = exp;
 315 }