ld/mri.c

   1 /* mri.c -- handle MRI style linker scripts
   2    Copyright (C) 1991-2023 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 "ctf-api.h"
  30 #include "ld.h"
  31 #include "ldexp.h"
  32 #include "ldlang.h"
  33 #include "ldmisc.h"
  34 #include "mri.h"
  35 #include <ldgram.h>
  36 #include "libiberty.h"
  37
  38 struct section_name_struct {
  39   struct section_name_struct *next;
  40   const char *name;
  41   const char *alias;
  42   etree_type *vma;
  43   etree_type *align;
  44   etree_type *subalign;
  45   int ok_to_load;
  46 };
  47
  48 static unsigned int symbol_truncate = 10000;
  49 static etree_type *base; /* Relocation base - or null */
  50
  51 static struct section_name_struct *order;
  52 static struct section_name_struct *only_load;
  53 static struct section_name_struct *address;
  54 static struct section_name_struct *alias;
  55
  56 static struct section_name_struct *alignment;
  57 static struct section_name_struct *subalignment;
  58
  59 static struct section_name_struct **
  60 lookup (const char *name, struct section_name_struct **list)
  61 {
  62   struct section_name_struct **ptr = list;
  63
  64   while (*ptr)
  65     {
  66       if (strcmp (name, (*ptr)->name) == 0)
  67         /* If this is a match, delete it, we only keep the last instance
  68            of any name.  */
  69         *ptr = (*ptr)->next;
  70       else
  71         ptr = &((*ptr)->next);
  72     }
  73
  74   *ptr = (struct section_name_struct *)
  75       xmalloc (sizeof (struct section_name_struct));
  76   return ptr;
  77 }
  78
  79 static void
  80 mri_add_to_list (struct section_name_struct **list,
  81                  const char *name,
  82                  etree_type *vma,
  83                  const char *zalias,
  84                  etree_type *align,
  85                  etree_type *subalign)
  86 {
  87   struct section_name_struct **ptr = lookup (name, list);
  88
  89   (*ptr)->name = name;
  90   (*ptr)->vma = vma;
  91   (*ptr)->next = NULL;
  92   (*ptr)->ok_to_load = 0;
  93   (*ptr)->alias = zalias;
  94   (*ptr)->align = align;
  95   (*ptr)->subalign = subalign;
  96 }
  97
  98 void
  99 mri_output_section (const char *name, etree_type *vma)
 100 {
 101   mri_add_to_list (&address, name, vma, 0, 0, 0);
 102 }
 103
 104 /* If any ABSOLUTE <name> are in the script, only load those files
 105    marked thus.  */
 106
 107 void
 108 mri_only_load (const char *name)
 109 {
 110   mri_add_to_list (&only_load, name, 0, 0, 0, 0);
 111 }
 112
 113 void
 114 mri_base (etree_type *exp)
 115 {
 116   base = exp;
 117 }
 118
 119 static int done_tree = 0;
 120
 121 void
 122 mri_draw_tree (void)
 123 {
 124   if (done_tree)
 125     return;
 126
 127   /* Now build the statements for the ldlang machine.  */
 128
 129   /* Attach the addresses of any which have addresses,
 130      and add the ones not mentioned.  */
 131   if (address != NULL)
 132     {
 133       struct section_name_struct *alist;
 134       struct section_name_struct *olist;
 135
 136       if (order == NULL)
 137         order = address;
 138
 139       for (alist = address;
 140            alist != NULL;
 141            alist = alist->next)
 142         {
 143           int done = 0;
 144
 145           for (olist = order; done == 0 && olist != NULL; olist = olist->next)
 146             {
 147               if (strcmp (alist->name, olist->name) == 0)
 148                 {
 149                   olist->vma = alist->vma;
 150                   done = 1;
 151                 }
 152             }
 153
 154           if (!done)
 155             {
 156               /* Add this onto end of order list.  */
 157               mri_add_to_list (&order, alist->name, alist->vma, 0, 0, 0);
 158             }
 159         }
 160     }
 161
 162   /* If we're only supposed to load a subset of them in, then prune
 163      the list.  */
 164   if (only_load != NULL)
 165     {
 166       struct section_name_struct *ptr1;
 167       struct section_name_struct *ptr2;
 168
 169       if (order == NULL)
 170         order = only_load;
 171
 172       /* See if this name is in the list, if it is then we can load it.  */
 173       for (ptr1 = only_load; ptr1; ptr1 = ptr1->next)
 174         for (ptr2 = order; ptr2; ptr2 = ptr2->next)
 175           if (strcmp (ptr2->name, ptr1->name) == 0)
 176             ptr2->ok_to_load = 1;
 177     }
 178   else
 179     {
 180       /* No only load list, so everything is ok to load.  */
 181       struct section_name_struct *ptr;
 182
 183       for (ptr = order; ptr; ptr = ptr->next)
 184         ptr->ok_to_load = 1;
 185     }
 186
 187   /* Create the order of sections to load.  */
 188   if (order != NULL)
 189     {
 190       /* Been told to output the sections in a certain order.  */
 191       struct section_name_struct *p = order;
 192
 193       while (p)
 194         {
 195           struct section_name_struct *aptr;
 196           etree_type *align = 0;
 197           etree_type *subalign = 0;
 198           struct wildcard_list *tmp;
 199
 200           /* See if an alignment has been specified.  */
 201           for (aptr = alignment; aptr; aptr = aptr->next)
 202             if (strcmp (aptr->name, p->name) == 0)
 203               align = aptr->align;
 204
 205           for (aptr = subalignment; aptr; aptr = aptr->next)
 206             if (strcmp (aptr->name, p->name) == 0)
 207               subalign = aptr->subalign;
 208
 209           if (base == 0)
 210             base = p->vma ? p->vma : exp_nameop (NAME, ".");
 211
 212           lang_enter_output_section_statement (p->name, base,
 213             p->ok_to_load ? normal_section : noload_section, 0,
 214             align, subalign, NULL, 0, 0);
 215           base = 0;
 216           tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 217           tmp->next = NULL;
 218           tmp->spec.name = p->name;
 219           tmp->spec.exclude_name_list = NULL;
 220           tmp->spec.sorted = none;
 221           tmp->spec.section_flag_list = NULL;
 222           lang_add_wild (NULL, tmp, false);
 223
 224           /* If there is an alias for this section, add it too.  */
 225           for (aptr = alias; aptr; aptr = aptr->next)
 226             if (strcmp (aptr->alias, p->name) == 0)
 227               {
 228                 tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 229                 tmp->next = NULL;
 230                 tmp->spec.name = aptr->name;
 231                 tmp->spec.exclude_name_list = NULL;
 232                 tmp->spec.sorted = none;
 233                 tmp->spec.section_flag_list = NULL;
 234                 lang_add_wild (NULL, tmp, false);
 235               }
 236
 237           lang_leave_output_section_statement (0, "*default*", NULL, NULL);
 238
 239           p = p->next;
 240         }
 241     }
 242
 243   done_tree = 1;
 244 }
 245
 246 void
 247 mri_load (const char *name)
 248 {
 249   base = 0;
 250   lang_add_input_file (name, lang_input_file_is_file_enum, NULL);
 251 }
 252
 253 void
 254 mri_order (const char *name)
 255 {
 256   mri_add_to_list (&order, name, 0, 0, 0, 0);
 257 }
 258
 259 void
 260 mri_alias (const char *want, const char *is, int isn)
 261 {
 262   if (!is)
 263     {
 264       char buf[20];
 265
 266       /* Some sections are digits.  */
 267       sprintf (buf, "%d", isn);
 268
 269       is = xstrdup (buf);
 270
 271       if (is == NULL)
 272         abort ();
 273     }
 274
 275   mri_add_to_list (&alias, is, 0, want, 0, 0);
 276 }
 277
 278 void
 279 mri_name (const char *name)
 280 {
 281   lang_add_output (name, 1);
 282 }
 283
 284 void
 285 mri_format (const char *name)
 286 {
 287   if (strcmp (name, "S") == 0)
 288     lang_add_output_format ("srec", NULL, NULL, 1);
 289
 290   else
 291     einfo (_("%F%P: 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_assign (name, exp, false));
 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 }