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 "ld.h"
  29 #include "ldexp.h"
  30 #include "ldlang.h"
  31 #include "ldmisc.h"
  32 #include "mri.h"
  33 #include <ldgram.h>
  34 #include "libiberty.h"
  35
  36 struct section_name_struct {
  37   struct section_name_struct *next;
  38   const char *name;
  39   const char *alias;
  40   etree_type *vma;
  41   etree_type *align;
  42   etree_type *subalign;
  43   int ok_to_load;
  44 };
  45
  46 static unsigned int symbol_truncate = 10000;
  47 static etree_type *base; /* Relocation base - or null */
  48
  49 static struct section_name_struct *order;
  50 static struct section_name_struct *only_load;
  51 static struct section_name_struct *address;
  52 static struct section_name_struct *alias;
  53
  54 static struct section_name_struct *alignment;
  55 static struct section_name_struct *subalignment;
  56
  57 static struct section_name_struct **
  58 lookup (const char *name, struct section_name_struct **list)
  59 {
  60   struct section_name_struct **ptr = list;
  61
  62   while (*ptr)
  63     {
  64       if (strcmp (name, (*ptr)->name) == 0)
  65         /* If this is a match, delete it, we only keep the last instance
  66            of any name.  */
  67         *ptr = (*ptr)->next;
  68       else
  69         ptr = &((*ptr)->next);
  70     }
  71
  72   *ptr = (struct section_name_struct *)
  73       xmalloc (sizeof (struct section_name_struct));
  74   return ptr;
  75 }
  76
  77 static void
  78 mri_add_to_list (struct section_name_struct **list,
  79                  const char *name,
  80                  etree_type *vma,
  81                  const char *zalias,
  82                  etree_type *align,
  83                  etree_type *subalign)
  84 {
  85   struct section_name_struct **ptr = lookup (name, list);
  86
  87   (*ptr)->name = name;
  88   (*ptr)->vma = vma;
  89   (*ptr)->next = NULL;
  90   (*ptr)->ok_to_load = 0;
  91   (*ptr)->alias = zalias;
  92   (*ptr)->align = align;
  93   (*ptr)->subalign = subalign;
  94 }
  95
  96 void
  97 mri_output_section (const char *name, etree_type *vma)
  98 {
  99   mri_add_to_list (&address, name, vma, 0, 0, 0);
 100 }
 101
 102 /* If any ABSOLUTE <name> are in the script, only load those files
 103    marked thus.  */
 104
 105 void
 106 mri_only_load (const char *name)
 107 {
 108   mri_add_to_list (&only_load, name, 0, 0, 0, 0);
 109 }
 110
 111 void
 112 mri_base (etree_type *exp)
 113 {
 114   base = exp;
 115 }
 116
 117 static int done_tree = 0;
 118
 119 void
 120 mri_draw_tree (void)
 121 {
 122   if (done_tree)
 123     return;
 124
 125   /* Now build the statements for the ldlang machine.  */
 126
 127   /* Attach the addresses of any which have addresses,
 128      and add the ones not mentioned.  */
 129   if (address != NULL)
 130     {
 131       struct section_name_struct *alist;
 132       struct section_name_struct *olist;
 133
 134       if (order == NULL)
 135         order = address;
 136
 137       for (alist = address;
 138            alist != NULL;
 139            alist = alist->next)
 140         {
 141           int done = 0;
 142
 143           for (olist = order; done == 0 && olist != NULL; olist = olist->next)
 144             {
 145               if (strcmp (alist->name, olist->name) == 0)
 146                 {
 147                   olist->vma = alist->vma;
 148                   done = 1;
 149                 }
 150             }
 151
 152           if (!done)
 153             {
 154               /* Add this onto end of order list.  */
 155               mri_add_to_list (&order, alist->name, alist->vma, 0, 0, 0);
 156             }
 157         }
 158     }
 159
 160   /* If we're only supposed to load a subset of them in, then prune
 161      the list.  */
 162   if (only_load != NULL)
 163     {
 164       struct section_name_struct *ptr1;
 165       struct section_name_struct *ptr2;
 166
 167       if (order == NULL)
 168         order = only_load;
 169
 170       /* See if this name is in the list, if it is then we can load it.  */
 171       for (ptr1 = only_load; ptr1; ptr1 = ptr1->next)
 172         for (ptr2 = order; ptr2; ptr2 = ptr2->next)
 173           if (strcmp (ptr2->name, ptr1->name) == 0)
 174             ptr2->ok_to_load = 1;
 175     }
 176   else
 177     {
 178       /* No only load list, so everything is ok to load.  */
 179       struct section_name_struct *ptr;
 180
 181       for (ptr = order; ptr; ptr = ptr->next)
 182         ptr->ok_to_load = 1;
 183     }
 184
 185   /* Create the order of sections to load.  */
 186   if (order != NULL)
 187     {
 188       /* Been told to output the sections in a certain order.  */
 189       struct section_name_struct *p = order;
 190
 191       while (p)
 192         {
 193           struct section_name_struct *aptr;
 194           etree_type *align = 0;
 195           etree_type *subalign = 0;
 196           struct wildcard_list *tmp;
 197
 198           /* See if an alignment has been specified.  */
 199           for (aptr = alignment; aptr; aptr = aptr->next)
 200             if (strcmp (aptr->name, p->name) == 0)
 201               align = aptr->align;
 202
 203           for (aptr = subalignment; aptr; aptr = aptr->next)
 204             if (strcmp (aptr->name, p->name) == 0)
 205               subalign = aptr->subalign;
 206
 207           if (base == 0)
 208             base = p->vma ? p->vma : exp_nameop (NAME, ".");
 209
 210           lang_enter_output_section_statement (p->name, base,
 211                                                p->ok_to_load ? normal_section : noload_section,
 212                                                align, subalign, NULL, 0, 0);
 213           base = 0;
 214           tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 215           tmp->next = NULL;
 216           tmp->spec.name = p->name;
 217           tmp->spec.exclude_name_list = NULL;
 218           tmp->spec.sorted = none;
 219           tmp->spec.section_flag_list = NULL;
 220           lang_add_wild (NULL, tmp, FALSE);
 221
 222           /* If there is an alias for this section, add it too.  */
 223           for (aptr = alias; aptr; aptr = aptr->next)
 224             if (strcmp (aptr->alias, p->name) == 0)
 225               {
 226                 tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 227                 tmp->next = NULL;
 228                 tmp->spec.name = aptr->name;
 229                 tmp->spec.exclude_name_list = NULL;
 230                 tmp->spec.sorted = none;
 231                 tmp->spec.section_flag_list = NULL;
 232                 lang_add_wild (NULL, tmp, FALSE);
 233               }
 234
 235           lang_leave_output_section_statement (0, "*default*", NULL, NULL);
 236
 237           p = p->next;
 238         }
 239     }
 240
 241   done_tree = 1;
 242 }
 243
 244 void
 245 mri_load (const char *name)
 246 {
 247   base = 0;
 248   lang_add_input_file (name, lang_input_file_is_file_enum, NULL);
 249 }
 250
 251 void
 252 mri_order (const char *name)
 253 {
 254   mri_add_to_list (&order, name, 0, 0, 0, 0);
 255 }
 256
 257 void
 258 mri_alias (const char *want, const char *is, int isn)
 259 {
 260   if (!is)
 261     {
 262       char buf[20];
 263
 264       /* Some sections are digits.  */
 265       sprintf (buf, "%d", isn);
 266
 267       is = xstrdup (buf);
 268
 269       if (is == NULL)
 270         abort ();
 271     }
 272
 273   mri_add_to_list (&alias, is, 0, want, 0, 0);
 274 }
 275
 276 void
 277 mri_name (const char *name)
 278 {
 279   lang_add_output (name, 1);
 280 }
 281
 282 void
 283 mri_format (const char *name)
 284 {
 285   if (strcmp (name, "S") == 0)
 286     lang_add_output_format ("srec", NULL, NULL, 1);
 287
 288   else
 289     einfo (_("%F%P: unknown format type %s\n"), name);
 290 }
 291
 292 void
 293 mri_public (const char *name, etree_type *exp)
 294 {
 295   lang_add_assignment (exp_assign (name, exp, FALSE));
 296 }
 297
 298 void
 299 mri_align (const char *name, etree_type *exp)
 300 {
 301   mri_add_to_list (&alignment, name, 0, 0, exp, 0);
 302 }
 303
 304 void
 305 mri_alignmod (const char *name, etree_type *exp)
 306 {
 307   mri_add_to_list (&subalignment, name, 0, 0, 0, exp);
 308 }
 309
 310 void
 311 mri_truncate (unsigned int exp)
 312 {
 313   symbol_truncate = exp;
 314 }