gdb/compile/compile-object-load.c

   1 /* Load module for 'compile' command.
   2
   3    Copyright (C) 2014-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "compile-object-load.h"
  22 #include "compile-internal.h"
  23 #include "command.h"
  24 #include "objfiles.h"
  25 #include "gdbcore.h"
  26 #include "readline/tilde.h"
  27 #include "bfdlink.h"
  28 #include "gdbcmd.h"
  29 #include "regcache.h"
  30 #include "inferior.h"
  31 #include "compile.h"
  32 #include "arch-utils.h"
  33
  34 /* Helper data for setup_sections.  */
  35
  36 struct setup_sections_data
  37 {
  38   /* Size of all recent sections with matching LAST_PROT.  */
  39   CORE_ADDR last_size;
  40
  41   /* First section matching LAST_PROT.  */
  42   asection *last_section_first;
  43
  44   /* Memory protection like the prot parameter of gdbarch_infcall_mmap. */
  45   unsigned last_prot;
  46
  47   /* Maximum of alignments of all sections matching LAST_PROT.
  48      This value is always at least 1.  This value is always a power of 2.  */
  49   CORE_ADDR last_max_alignment;
  50 };
  51
  52 /* Place all ABFD sections next to each other obeying all constraints.  */
  53
  54 static void
  55 setup_sections (bfd *abfd, asection *sect, void *data_voidp)
  56 {
  57   struct setup_sections_data *data = data_voidp;
  58   CORE_ADDR alignment;
  59   unsigned prot;
  60
  61   if (sect != NULL)
  62     {
  63       /* It is required by later bfd_get_relocated_section_contents.  */
  64       if (sect->output_section == NULL)
  65         sect->output_section = sect;
  66
  67       if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
  68         return;
  69
  70       /* Make the memory always readable.  */
  71       prot = GDB_MMAP_PROT_READ;
  72       if ((bfd_get_section_flags (abfd, sect) & SEC_READONLY) == 0)
  73         prot |= GDB_MMAP_PROT_WRITE;
  74       if ((bfd_get_section_flags (abfd, sect) & SEC_CODE) != 0)
  75         prot |= GDB_MMAP_PROT_EXEC;
  76
  77       if (compile_debug)
  78         fprintf_unfiltered (gdb_stdout,
  79                             "module \"%s\" section \"%s\" size %s prot %u\n",
  80                             bfd_get_filename (abfd),
  81                             bfd_get_section_name (abfd, sect),
  82                             paddress (target_gdbarch (),
  83                                       bfd_get_section_size (sect)),
  84                             prot);
  85     }
  86   else
  87     prot = -1;
  88
  89   if (sect == NULL
  90       || (data->last_prot != prot && bfd_get_section_size (sect) != 0))
  91     {
  92       CORE_ADDR addr;
  93       asection *sect_iter;
  94
  95       if (data->last_size != 0)
  96         {
  97           addr = gdbarch_infcall_mmap (target_gdbarch (), data->last_size,
  98                                        data->last_prot);
  99           if (compile_debug)
 100             fprintf_unfiltered (gdb_stdout,
 101                                 "allocated %s bytes at %s prot %u\n",
 102                                 paddress (target_gdbarch (), data->last_size),
 103                                 paddress (target_gdbarch (), addr),
 104                                 data->last_prot);
 105         }
 106       else
 107         addr = 0;
 108
 109       if ((addr & (data->last_max_alignment - 1)) != 0)
 110         error (_("Inferior compiled module address %s "
 111                  "is not aligned to BFD required %s."),
 112                paddress (target_gdbarch (), addr),
 113                paddress (target_gdbarch (), data->last_max_alignment));
 114
 115       for (sect_iter = data->last_section_first; sect_iter != sect;
 116            sect_iter = sect_iter->next)
 117         if ((bfd_get_section_flags (abfd, sect_iter) & SEC_ALLOC) != 0)
 118           bfd_set_section_vma (abfd, sect_iter,
 119                                addr + bfd_get_section_vma (abfd, sect_iter));
 120
 121       data->last_size = 0;
 122       data->last_section_first = sect;
 123       data->last_prot = prot;
 124       data->last_max_alignment = 1;
 125     }
 126
 127   if (sect == NULL)
 128     return;
 129
 130   alignment = ((CORE_ADDR) 1) << bfd_get_section_alignment (abfd, sect);
 131   data->last_max_alignment = max (data->last_max_alignment, alignment);
 132
 133   data->last_size = (data->last_size + alignment - 1) & -alignment;
 134
 135   bfd_set_section_vma (abfd, sect, data->last_size);
 136
 137   data->last_size += bfd_get_section_size (sect);
 138   data->last_size = (data->last_size + alignment - 1) & -alignment;
 139 }
 140
 141 /* Helper for link_callbacks callbacks vector.  */
 142
 143 static bfd_boolean
 144 link_callbacks_multiple_definition (struct bfd_link_info *link_info,
 145                                     struct bfd_link_hash_entry *h, bfd *nbfd,
 146                                     asection *nsec, bfd_vma nval)
 147 {
 148   bfd *abfd = link_info->input_bfds;
 149
 150   if (link_info->allow_multiple_definition)
 151     return TRUE;
 152   warning (_("Compiled module \"%s\": multiple symbol definitions: %s"),
 153            bfd_get_filename (abfd), h->root.string);
 154   return FALSE;
 155 }
 156
 157 /* Helper for link_callbacks callbacks vector.  */
 158
 159 static bfd_boolean
 160 link_callbacks_warning (struct bfd_link_info *link_info, const char *xwarning,
 161                         const char *symbol, bfd *abfd, asection *section,
 162                         bfd_vma address)
 163 {
 164   warning (_("Compiled module \"%s\" section \"%s\": warning: %s"),
 165            bfd_get_filename (abfd), bfd_get_section_name (abfd, section),
 166            xwarning);
 167   /* Maybe permit running as a module?  */
 168   return FALSE;
 169 }
 170
 171 /* Helper for link_callbacks callbacks vector.  */
 172
 173 static bfd_boolean
 174 link_callbacks_undefined_symbol (struct bfd_link_info *link_info,
 175                                  const char *name, bfd *abfd, asection *section,
 176                                  bfd_vma address, bfd_boolean is_fatal)
 177 {
 178   warning (_("Cannot resolve relocation to \"%s\" "
 179              "from compiled module \"%s\" section \"%s\"."),
 180            name, bfd_get_filename (abfd), bfd_get_section_name (abfd, section));
 181   return FALSE;
 182 }
 183
 184 /* Helper for link_callbacks callbacks vector.  */
 185
 186 static bfd_boolean
 187 link_callbacks_reloc_overflow (struct bfd_link_info *link_info,
 188                                struct bfd_link_hash_entry *entry,
 189                                const char *name, const char *reloc_name,
 190                                bfd_vma addend, bfd *abfd, asection *section,
 191                                bfd_vma address)
 192 {
 193   /* TRUE is required for intra-module relocations.  */
 194   return TRUE;
 195 }
 196
 197 /* Helper for link_callbacks callbacks vector.  */
 198
 199 static bfd_boolean
 200 link_callbacks_reloc_dangerous (struct bfd_link_info *link_info,
 201                                 const char *message, bfd *abfd,
 202                                 asection *section, bfd_vma address)
 203 {
 204   warning (_("Compiled module \"%s\" section \"%s\": dangerous "
 205              "relocation: %s\n"),
 206            bfd_get_filename (abfd), bfd_get_section_name (abfd, section),
 207            message);
 208   return FALSE;
 209 }
 210
 211 /* Helper for link_callbacks callbacks vector.  */
 212
 213 static bfd_boolean
 214 link_callbacks_unattached_reloc (struct bfd_link_info *link_info,
 215                                  const char *name, bfd *abfd, asection *section,
 216                                  bfd_vma address)
 217 {
 218   warning (_("Compiled module \"%s\" section \"%s\": unattached "
 219              "relocation: %s\n"),
 220            bfd_get_filename (abfd), bfd_get_section_name (abfd, section),
 221            name);
 222   return FALSE;
 223 }
 224
 225 /* Helper for link_callbacks callbacks vector.  */
 226
 227 static void link_callbacks_einfo (const char *fmt, ...)
 228   ATTRIBUTE_PRINTF (1, 2);
 229
 230 static void
 231 link_callbacks_einfo (const char *fmt, ...)
 232 {
 233   struct cleanup *cleanups;
 234   va_list ap;
 235   char *str;
 236
 237   va_start (ap, fmt);
 238   str = xstrvprintf (fmt, ap);
 239   va_end (ap);
 240   cleanups = make_cleanup (xfree, str);
 241
 242   warning (_("Compile module: warning: %s"), str);
 243
 244   do_cleanups (cleanups);
 245 }
 246
 247 /* Helper for bfd_get_relocated_section_contents.
 248    Only these symbols are set by bfd_simple_get_relocated_section_contents
 249    but bfd/ seems to use even the NULL ones without checking them first.  */
 250
 251 static const struct bfd_link_callbacks link_callbacks =
 252 {
 253   NULL, /* add_archive_element */
 254   link_callbacks_multiple_definition, /* multiple_definition */
 255   NULL, /* multiple_common */
 256   NULL, /* add_to_set */
 257   NULL, /* constructor */
 258   link_callbacks_warning, /* warning */
 259   link_callbacks_undefined_symbol, /* undefined_symbol */
 260   link_callbacks_reloc_overflow, /* reloc_overflow */
 261   link_callbacks_reloc_dangerous, /* reloc_dangerous */
 262   link_callbacks_unattached_reloc, /* unattached_reloc */
 263   NULL, /* notice */
 264   link_callbacks_einfo, /* einfo */
 265   NULL, /* info */
 266   NULL, /* minfo */
 267   NULL, /* override_segment_assignment */
 268 };
 269
 270 struct link_hash_table_cleanup_data
 271 {
 272   bfd *abfd;
 273   bfd *link_next;
 274 };
 275
 276 /* Cleanup callback for struct bfd_link_info.  */
 277
 278 static void
 279 link_hash_table_free (void *d)
 280 {
 281   struct link_hash_table_cleanup_data *data = d;
 282
 283   if (data->abfd->is_linker_output)
 284     (*data->abfd->link.hash->hash_table_free) (data->abfd);
 285   data->abfd->link.next = data->link_next;
 286 }
 287
 288 /* Relocate and store into inferior memory each section SECT of ABFD.  */
 289
 290 static void
 291 copy_sections (bfd *abfd, asection *sect, void *data)
 292 {
 293   asymbol **symbol_table = data;
 294   bfd_byte *sect_data, *sect_data_got;
 295   struct cleanup *cleanups;
 296   struct bfd_link_info link_info;
 297   struct bfd_link_order link_order;
 298   CORE_ADDR inferior_addr;
 299   struct link_hash_table_cleanup_data cleanup_data;
 300
 301   if ((bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD))
 302       != (SEC_ALLOC | SEC_LOAD))
 303     return;
 304
 305   if (bfd_get_section_size (sect) == 0)
 306     return;
 307
 308   /* Mostly a copy of bfd_simple_get_relocated_section_contents which GDB
 309      cannot use as it does not report relocations to undefined symbols.  */
 310   memset (&link_info, 0, sizeof (link_info));
 311   link_info.output_bfd = abfd;
 312   link_info.input_bfds = abfd;
 313   link_info.input_bfds_tail = &abfd->link.next;
 314
 315   cleanup_data.abfd = abfd;
 316   cleanup_data.link_next = abfd->link.next;
 317
 318   abfd->link.next = NULL;
 319   link_info.hash = bfd_link_hash_table_create (abfd);
 320
 321   cleanups = make_cleanup (link_hash_table_free, &cleanup_data);
 322   link_info.callbacks = &link_callbacks;
 323
 324   memset (&link_order, 0, sizeof (link_order));
 325   link_order.next = NULL;
 326   link_order.type = bfd_indirect_link_order;
 327   link_order.offset = 0;
 328   link_order.size = bfd_get_section_size (sect);
 329   link_order.u.indirect.section = sect;
 330
 331   sect_data = xmalloc (bfd_get_section_size (sect));
 332   make_cleanup (xfree, sect_data);
 333
 334   sect_data_got = bfd_get_relocated_section_contents (abfd, &link_info,
 335                                                       &link_order, sect_data,
 336                                                       FALSE, symbol_table);
 337
 338   if (sect_data_got == NULL)
 339     error (_("Cannot map compiled module \"%s\" section \"%s\": %s"),
 340            bfd_get_filename (abfd), bfd_get_section_name (abfd, sect),
 341            bfd_errmsg (bfd_get_error ()));
 342   gdb_assert (sect_data_got == sect_data);
 343
 344   inferior_addr = bfd_get_section_vma (abfd, sect);
 345   if (0 != target_write_memory (inferior_addr, sect_data,
 346                                 bfd_get_section_size (sect)))
 347     error (_("Cannot write compiled module \"%s\" section \"%s\" "
 348              "to inferior memory range %s-%s."),
 349            bfd_get_filename (abfd), bfd_get_section_name (abfd, sect),
 350            paddress (target_gdbarch (), inferior_addr),
 351            paddress (target_gdbarch (),
 352                      inferior_addr + bfd_get_section_size (sect)));
 353
 354   do_cleanups (cleanups);
 355 }
 356
 357 /* Fetch the type of first parameter of FUNC_SYM.
 358    Return NULL if FUNC_SYM has no parameters.  Throw an error otherwise.  */
 359
 360 static struct type *
 361 get_regs_type (struct symbol *func_sym, struct objfile *objfile)
 362 {
 363   struct type *func_type = SYMBOL_TYPE (func_sym);
 364   struct type *regsp_type, *regs_type;
 365
 366   /* No register parameter present.  */
 367   if (TYPE_NFIELDS (func_type) == 0)
 368     return NULL;
 369
 370   regsp_type = check_typedef (TYPE_FIELD_TYPE (func_type, 0));
 371   if (TYPE_CODE (regsp_type) != TYPE_CODE_PTR)
 372     error (_("Invalid type code %d of first parameter of function \"%s\" "
 373              "in compiled module \"%s\"."),
 374            TYPE_CODE (regsp_type), GCC_FE_WRAPPER_FUNCTION,
 375            objfile_name (objfile));
 376
 377   regs_type = check_typedef (TYPE_TARGET_TYPE (regsp_type));
 378   if (TYPE_CODE (regs_type) != TYPE_CODE_STRUCT)
 379     error (_("Invalid type code %d of dereferenced first parameter "
 380              "of function \"%s\" in compiled module \"%s\"."),
 381            TYPE_CODE (regs_type), GCC_FE_WRAPPER_FUNCTION,
 382            objfile_name (objfile));
 383
 384   return regs_type;
 385 }
 386
 387 /* Store all inferior registers required by REGS_TYPE to inferior memory
 388    starting at inferior address REGS_BASE.  */
 389
 390 static void
 391 store_regs (struct type *regs_type, CORE_ADDR regs_base)
 392 {
 393   struct gdbarch *gdbarch = target_gdbarch ();
 394   struct regcache *regcache = get_thread_regcache (inferior_ptid);
 395   int fieldno;
 396
 397   for (fieldno = 0; fieldno < TYPE_NFIELDS (regs_type); fieldno++)
 398     {
 399       const char *reg_name = TYPE_FIELD_NAME (regs_type, fieldno);
 400       ULONGEST reg_bitpos = TYPE_FIELD_BITPOS (regs_type, fieldno);
 401       ULONGEST reg_bitsize = TYPE_FIELD_BITSIZE (regs_type, fieldno);
 402       ULONGEST reg_offset;
 403       struct type *reg_type = check_typedef (TYPE_FIELD_TYPE (regs_type,
 404                                                               fieldno));
 405       ULONGEST reg_size = TYPE_LENGTH (reg_type);
 406       int regnum;
 407       struct value *regval;
 408       CORE_ADDR inferior_addr;
 409
 410       if (strcmp (reg_name, COMPILE_I_SIMPLE_REGISTER_DUMMY) == 0)
 411         continue;
 412
 413       if ((reg_bitpos % 8) != 0 || reg_bitsize != 0)
 414         error (_("Invalid register \"%s\" position %s bits or size %s bits"),
 415                reg_name, pulongest (reg_bitpos), pulongest (reg_bitsize));
 416       reg_offset = reg_bitpos / 8;
 417
 418       if (TYPE_CODE (reg_type) != TYPE_CODE_INT
 419           && TYPE_CODE (reg_type) != TYPE_CODE_PTR)
 420         error (_("Invalid register \"%s\" type code %d"), reg_name,
 421                TYPE_CODE (reg_type));
 422
 423       regnum = compile_register_name_demangle (gdbarch, reg_name);
 424
 425       regval = value_from_register (reg_type, regnum, get_current_frame ());
 426       if (value_optimized_out (regval))
 427         error (_("Register \"%s\" is optimized out."), reg_name);
 428       if (!value_entirely_available (regval))
 429         error (_("Register \"%s\" is not available."), reg_name);
 430
 431       inferior_addr = regs_base + reg_offset;
 432       if (0 != target_write_memory (inferior_addr, value_contents (regval),
 433                                     reg_size))
 434         error (_("Cannot write register \"%s\" to inferior memory at %s."),
 435                reg_name, paddress (gdbarch, inferior_addr));
 436     }
 437 }
 438
 439 /* Load OBJECT_FILE into inferior memory.  Throw an error otherwise.
 440    Caller must fully dispose the return value by calling compile_object_run.
 441    SOURCE_FILE's copy is stored into the returned object.
 442    Caller should free both OBJECT_FILE and SOURCE_FILE immediatelly after this
 443    function returns.  */
 444
 445 struct compile_module *
 446 compile_object_load (const char *object_file, const char *source_file,
 447                      enum compile_i_scope_types scope, void *scope_data)
 448 {
 449   struct cleanup *cleanups, *cleanups_free_objfile;
 450   bfd *abfd;
 451   struct setup_sections_data setup_sections_data;
 452   CORE_ADDR addr, regs_addr;
 453   struct symbol *func_sym;
 454   struct type *func_type;
 455   struct bound_minimal_symbol bmsym;
 456   long storage_needed;
 457   asymbol **symbol_table, **symp;
 458   long number_of_symbols, missing_symbols;
 459   struct type *dptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
 460   unsigned dptr_type_len = TYPE_LENGTH (dptr_type);
 461   struct compile_module *retval;
 462   struct type *regs_type;
 463   char *filename, **matching;
 464   struct objfile *objfile;
 465   int expect_parameters;
 466   struct type *expect_return_type;
 467
 468   filename = tilde_expand (object_file);
 469   cleanups = make_cleanup (xfree, filename);
 470
 471   abfd = gdb_bfd_open (filename, gnutarget, -1);
 472   if (abfd == NULL)
 473     error (_("\"%s\": could not open as compiled module: %s"),
 474           filename, bfd_errmsg (bfd_get_error ()));
 475   make_cleanup_bfd_unref (abfd);
 476
 477   if (!bfd_check_format_matches (abfd, bfd_object, &matching))
 478     error (_("\"%s\": not in loadable format: %s"),
 479           filename, gdb_bfd_errmsg (bfd_get_error (), matching));
 480
 481   if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) != 0)
 482     error (_("\"%s\": not in object format."), filename);
 483
 484   setup_sections_data.last_size = 0;
 485   setup_sections_data.last_section_first = abfd->sections;
 486   setup_sections_data.last_prot = -1;
 487   setup_sections_data.last_max_alignment = 1;
 488   bfd_map_over_sections (abfd, setup_sections, &setup_sections_data);
 489   setup_sections (abfd, NULL, &setup_sections_data);
 490
 491   storage_needed = bfd_get_symtab_upper_bound (abfd);
 492   if (storage_needed < 0)
 493     error (_("Cannot read symbols of compiled module \"%s\": %s"),
 494           filename, bfd_errmsg (bfd_get_error ()));
 495
 496   /* SYMFILE_VERBOSE is not passed even if FROM_TTY, user is not interested in
 497      "Reading symbols from ..." message for automatically generated file.  */
 498   objfile = symbol_file_add_from_bfd (abfd, filename, 0, NULL, 0, NULL);
 499   cleanups_free_objfile = make_cleanup_free_objfile (objfile);
 500
 501   func_sym = lookup_global_symbol_from_objfile (objfile,
 502                                                 GCC_FE_WRAPPER_FUNCTION,
 503                                                 VAR_DOMAIN);
 504   if (func_sym == NULL)
 505     error (_("Cannot find function \"%s\" in compiled module \"%s\"."),
 506            GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
 507   func_type = SYMBOL_TYPE (func_sym);
 508   if (TYPE_CODE (func_type) != TYPE_CODE_FUNC)
 509     error (_("Invalid type code %d of function \"%s\" in compiled "
 510              "module \"%s\"."),
 511            TYPE_CODE (func_type), GCC_FE_WRAPPER_FUNCTION,
 512            objfile_name (objfile));
 513
 514   switch (scope)
 515     {
 516     case COMPILE_I_SIMPLE_SCOPE:
 517       expect_parameters = 1;
 518       expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
 519       break;
 520     case COMPILE_I_RAW_SCOPE:
 521       expect_parameters = 0;
 522       expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
 523       break;
 524     default:
 525       internal_error (__FILE__, __LINE__, _("invalid scope %d"), scope);
 526     }
 527   if (TYPE_NFIELDS (func_type) != expect_parameters)
 528     error (_("Invalid %d parameters of function \"%s\" in compiled "
 529              "module \"%s\"."),
 530            TYPE_NFIELDS (func_type), GCC_FE_WRAPPER_FUNCTION,
 531            objfile_name (objfile));
 532   if (!types_deeply_equal (expect_return_type, TYPE_TARGET_TYPE (func_type)))
 533     error (_("Invalid return type of function \"%s\" in compiled "
 534             "module \"%s\"."),
 535           GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
 536
 537   /* The memory may be later needed
 538      by bfd_generic_get_relocated_section_contents
 539      called from default_symfile_relocate.  */
 540   symbol_table = obstack_alloc (&objfile->objfile_obstack, storage_needed);
 541   number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
 542   if (number_of_symbols < 0)
 543     error (_("Cannot parse symbols of compiled module \"%s\": %s"),
 544           filename, bfd_errmsg (bfd_get_error ()));
 545
 546   missing_symbols = 0;
 547   for (symp = symbol_table; symp < symbol_table + number_of_symbols; symp++)
 548     {
 549       asymbol *sym = *symp;
 550
 551       if (sym->flags != 0)
 552         continue;
 553       if (compile_debug)
 554         fprintf_unfiltered (gdb_stdout,
 555                             "lookup undefined ELF symbol \"%s\"\n",
 556                             sym->name);
 557       sym->flags = BSF_GLOBAL;
 558       sym->section = bfd_abs_section_ptr;
 559       if (strcmp (sym->name, "_GLOBAL_OFFSET_TABLE_") == 0)
 560         {
 561           sym->value = 0;
 562           continue;
 563         }
 564       bmsym = lookup_minimal_symbol (sym->name, NULL, NULL);
 565       switch (bmsym.minsym == NULL
 566               ? mst_unknown : MSYMBOL_TYPE (bmsym.minsym))
 567         {
 568         case mst_text:
 569           sym->value = BMSYMBOL_VALUE_ADDRESS (bmsym);
 570           break;
 571         case mst_text_gnu_ifunc:
 572           sym->value = gnu_ifunc_resolve_addr (target_gdbarch (),
 573                                                BMSYMBOL_VALUE_ADDRESS (bmsym));
 574           break;
 575         default:
 576           warning (_("Could not find symbol \"%s\" "
 577                      "for compiled module \"%s\"."),
 578                    sym->name, filename);
 579           missing_symbols++;
 580         }
 581     }
 582   if (missing_symbols)
 583     error (_("%ld symbols were missing, cannot continue."), missing_symbols);
 584
 585   bfd_map_over_sections (abfd, copy_sections, symbol_table);
 586
 587   regs_type = get_regs_type (func_sym, objfile);
 588   if (regs_type == NULL)
 589     regs_addr = 0;
 590   else
 591     {
 592       /* Use read-only non-executable memory protection.  */
 593       regs_addr = gdbarch_infcall_mmap (target_gdbarch (),
 594                                         TYPE_LENGTH (regs_type),
 595                                         GDB_MMAP_PROT_READ);
 596       gdb_assert (regs_addr != 0);
 597       if (compile_debug)
 598         fprintf_unfiltered (gdb_stdout,
 599                             "allocated %s bytes at %s for registers\n",
 600                             paddress (target_gdbarch (),
 601                                       TYPE_LENGTH (regs_type)),
 602                             paddress (target_gdbarch (), regs_addr));
 603       store_regs (regs_type, regs_addr);
 604     }
 605
 606   discard_cleanups (cleanups_free_objfile);
 607   do_cleanups (cleanups);
 608
 609   retval = xmalloc (sizeof (*retval));
 610   retval->objfile = objfile;
 611   retval->source_file = xstrdup (source_file);
 612   retval->func_sym = func_sym;
 613   retval->regs_addr = regs_addr;
 614   retval->scope = scope;
 615   retval->scope_data = scope_data;
 616   return retval;
 617 }