1 /* Load module for 'compile' command.
2
3 Copyright (C) 2014-2020 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 "gdbthread.h"
32 #include "compile.h"
33 #include "block.h"
34 #include "arch-utils.h"
35 #include <algorithm>
36
37 /* Add inferior mmap memory range ADDR..ADDR+SIZE (exclusive) to the
38 list. */
39
40 void
add(CORE_ADDR addr,CORE_ADDR size)41 munmap_list::add (CORE_ADDR addr, CORE_ADDR size)
42 {
43 struct munmap_item item = { addr, size };
44 items.push_back (item);
45 }
46
47 /* Destroy an munmap_list. */
48
~munmap_list()49 munmap_list::~munmap_list ()
50 {
51 for (auto &item : items)
52 {
53 try
54 {
55 gdbarch_infcall_munmap (target_gdbarch (), item.addr, item.size);
56 }
57 catch (const gdb_exception_error &ex)
58 {
59 /* There's not much the user can do, so just ignore
60 this. */
61 }
62 }
63 }
64
65 /* Helper data for setup_sections. */
66
67 struct setup_sections_data
68 {
69 /* Size of all recent sections with matching LAST_PROT. */
70 CORE_ADDR last_size;
71
72 /* First section matching LAST_PROT. */
73 asection *last_section_first;
74
75 /* Memory protection like the prot parameter of gdbarch_infcall_mmap. */
76 unsigned last_prot;
77
78 /* Maximum of alignments of all sections matching LAST_PROT.
79 This value is always at least 1. This value is always a power of 2. */
80 CORE_ADDR last_max_alignment;
81
82 /* List of inferior mmap ranges where setup_sections should add its
83 next range. */
84 std::unique_ptr<struct munmap_list> munmap_list;
85 };
86
87 /* Place all ABFD sections next to each other obeying all constraints. */
88
89 static void
setup_sections(bfd * abfd,asection * sect,void * data_voidp)90 setup_sections (bfd *abfd, asection *sect, void *data_voidp)
91 {
92 struct setup_sections_data *data = (struct setup_sections_data *) data_voidp;
93 CORE_ADDR alignment;
94 unsigned prot;
95
96 if (sect != NULL)
97 {
98 /* It is required by later bfd_get_relocated_section_contents. */
99 if (sect->output_section == NULL)
100 sect->output_section = sect;
101
102 if ((bfd_section_flags (sect) & SEC_ALLOC) == 0)
103 return;
104
105 /* Make the memory always readable. */
106 prot = GDB_MMAP_PROT_READ;
107 if ((bfd_section_flags (sect) & SEC_READONLY) == 0)
108 prot |= GDB_MMAP_PROT_WRITE;
109 if ((bfd_section_flags (sect) & SEC_CODE) != 0)
110 prot |= GDB_MMAP_PROT_EXEC;
111
112 if (compile_debug)
113 fprintf_unfiltered (gdb_stdlog,
114 "module \"%s\" section \"%s\" size %s prot %u\n",
115 bfd_get_filename (abfd),
116 bfd_section_name (sect),
117 paddress (target_gdbarch (),
118 bfd_section_size (sect)),
119 prot);
120 }
121 else
122 prot = -1;
123
124 if (sect == NULL
125 || (data->last_prot != prot && bfd_section_size (sect) != 0))
126 {
127 CORE_ADDR addr;
128 asection *sect_iter;
129
130 if (data->last_size != 0)
131 {
132 addr = gdbarch_infcall_mmap (target_gdbarch (), data->last_size,
133 data->last_prot);
134 data->munmap_list->add (addr, data->last_size);
135 if (compile_debug)
136 fprintf_unfiltered (gdb_stdlog,
137 "allocated %s bytes at %s prot %u\n",
138 paddress (target_gdbarch (), data->last_size),
139 paddress (target_gdbarch (), addr),
140 data->last_prot);
141 }
142 else
143 addr = 0;
144
145 if ((addr & (data->last_max_alignment - 1)) != 0)
146 error (_("Inferior compiled module address %s "
147 "is not aligned to BFD required %s."),
148 paddress (target_gdbarch (), addr),
149 paddress (target_gdbarch (), data->last_max_alignment));
150
151 for (sect_iter = data->last_section_first; sect_iter != sect;
152 sect_iter = sect_iter->next)
153 if ((bfd_section_flags (sect_iter) & SEC_ALLOC) != 0)
154 bfd_set_section_vma (sect_iter, addr + bfd_section_vma (sect_iter));
155
156 data->last_size = 0;
157 data->last_section_first = sect;
158 data->last_prot = prot;
159 data->last_max_alignment = 1;
160 }
161
162 if (sect == NULL)
163 return;
164
165 alignment = ((CORE_ADDR) 1) << bfd_section_alignment (sect);
166 data->last_max_alignment = std::max (data->last_max_alignment, alignment);
167
168 data->last_size = (data->last_size + alignment - 1) & -alignment;
169
170 bfd_set_section_vma (sect, data->last_size);
171
172 data->last_size += bfd_section_size (sect);
173 data->last_size = (data->last_size + alignment - 1) & -alignment;
174 }
175
176 /* Helper for link_callbacks callbacks vector. */
177
178 static void
link_callbacks_multiple_definition(struct bfd_link_info * link_info,struct bfd_link_hash_entry * h,bfd * nbfd,asection * nsec,bfd_vma nval)179 link_callbacks_multiple_definition (struct bfd_link_info *link_info,
180 struct bfd_link_hash_entry *h, bfd *nbfd,
181 asection *nsec, bfd_vma nval)
182 {
183 bfd *abfd = link_info->input_bfds;
184
185 if (link_info->allow_multiple_definition)
186 return;
187 warning (_("Compiled module \"%s\": multiple symbol definitions: %s"),
188 bfd_get_filename (abfd), h->root.string);
189 }
190
191 /* Helper for link_callbacks callbacks vector. */
192
193 static void
link_callbacks_warning(struct bfd_link_info * link_info,const char * xwarning,const char * symbol,bfd * abfd,asection * section,bfd_vma address)194 link_callbacks_warning (struct bfd_link_info *link_info, const char *xwarning,
195 const char *symbol, bfd *abfd, asection *section,
196 bfd_vma address)
197 {
198 warning (_("Compiled module \"%s\" section \"%s\": warning: %s"),
199 bfd_get_filename (abfd), bfd_section_name (section),
200 xwarning);
201 }
202
203 /* Helper for link_callbacks callbacks vector. */
204
205 static void
link_callbacks_undefined_symbol(struct bfd_link_info * link_info,const char * name,bfd * abfd,asection * section,bfd_vma address,bfd_boolean is_fatal)206 link_callbacks_undefined_symbol (struct bfd_link_info *link_info,
207 const char *name, bfd *abfd, asection *section,
208 bfd_vma address, bfd_boolean is_fatal)
209 {
210 warning (_("Cannot resolve relocation to \"%s\" "
211 "from compiled module \"%s\" section \"%s\"."),
212 name, bfd_get_filename (abfd), bfd_section_name (section));
213 }
214
215 /* Helper for link_callbacks callbacks vector. */
216
217 static void
link_callbacks_reloc_overflow(struct bfd_link_info * link_info,struct bfd_link_hash_entry * entry,const char * name,const char * reloc_name,bfd_vma addend,bfd * abfd,asection * section,bfd_vma address)218 link_callbacks_reloc_overflow (struct bfd_link_info *link_info,
219 struct bfd_link_hash_entry *entry,
220 const char *name, const char *reloc_name,
221 bfd_vma addend, bfd *abfd, asection *section,
222 bfd_vma address)
223 {
224 }
225
226 /* Helper for link_callbacks callbacks vector. */
227
228 static void
link_callbacks_reloc_dangerous(struct bfd_link_info * link_info,const char * message,bfd * abfd,asection * section,bfd_vma address)229 link_callbacks_reloc_dangerous (struct bfd_link_info *link_info,
230 const char *message, bfd *abfd,
231 asection *section, bfd_vma address)
232 {
233 warning (_("Compiled module \"%s\" section \"%s\": dangerous "
234 "relocation: %s\n"),
235 bfd_get_filename (abfd), bfd_section_name (section),
236 message);
237 }
238
239 /* Helper for link_callbacks callbacks vector. */
240
241 static void
link_callbacks_unattached_reloc(struct bfd_link_info * link_info,const char * name,bfd * abfd,asection * section,bfd_vma address)242 link_callbacks_unattached_reloc (struct bfd_link_info *link_info,
243 const char *name, bfd *abfd, asection *section,
244 bfd_vma address)
245 {
246 warning (_("Compiled module \"%s\" section \"%s\": unattached "
247 "relocation: %s\n"),
248 bfd_get_filename (abfd), bfd_section_name (section),
249 name);
250 }
251
252 /* Helper for link_callbacks callbacks vector. */
253
254 static void link_callbacks_einfo (const char *fmt, ...)
255 ATTRIBUTE_PRINTF (1, 2);
256
257 static void
link_callbacks_einfo(const char * fmt,...)258 link_callbacks_einfo (const char *fmt, ...)
259 {
260 va_list ap;
261
262 va_start (ap, fmt);
263 std::string str = string_vprintf (fmt, ap);
264 va_end (ap);
265
266 warning (_("Compile module: warning: %s"), str.c_str ());
267 }
268
269 /* Helper for bfd_get_relocated_section_contents.
270 Only these symbols are set by bfd_simple_get_relocated_section_contents
271 but bfd/ seems to use even the NULL ones without checking them first. */
272
273 static const struct bfd_link_callbacks link_callbacks =
274 {
275 NULL, /* add_archive_element */
276 link_callbacks_multiple_definition, /* multiple_definition */
277 NULL, /* multiple_common */
278 NULL, /* add_to_set */
279 NULL, /* constructor */
280 link_callbacks_warning, /* warning */
281 link_callbacks_undefined_symbol, /* undefined_symbol */
282 link_callbacks_reloc_overflow, /* reloc_overflow */
283 link_callbacks_reloc_dangerous, /* reloc_dangerous */
284 link_callbacks_unattached_reloc, /* unattached_reloc */
285 NULL, /* notice */
286 link_callbacks_einfo, /* einfo */
287 NULL, /* info */
288 NULL, /* minfo */
289 NULL, /* override_segment_assignment */
290 };
291
292 struct link_hash_table_cleanup_data
293 {
link_hash_table_cleanup_datalink_hash_table_cleanup_data294 explicit link_hash_table_cleanup_data (bfd *abfd_)
295 : abfd (abfd_),
296 link_next (abfd->link.next)
297 {
298 }
299
~link_hash_table_cleanup_datalink_hash_table_cleanup_data300 ~link_hash_table_cleanup_data ()
301 {
302 if (abfd->is_linker_output)
303 (*abfd->link.hash->hash_table_free) (abfd);
304 abfd->link.next = link_next;
305 }
306
307 DISABLE_COPY_AND_ASSIGN (link_hash_table_cleanup_data);
308
309 private:
310
311 bfd *abfd;
312 bfd *link_next;
313 };
314
315 /* Relocate and store into inferior memory each section SECT of ABFD. */
316
317 static void
copy_sections(bfd * abfd,asection * sect,void * data)318 copy_sections (bfd *abfd, asection *sect, void *data)
319 {
320 asymbol **symbol_table = (asymbol **) data;
321 bfd_byte *sect_data_got;
322 struct bfd_link_info link_info;
323 struct bfd_link_order link_order;
324 CORE_ADDR inferior_addr;
325
326 if ((bfd_section_flags (sect) & (SEC_ALLOC | SEC_LOAD))
327 != (SEC_ALLOC | SEC_LOAD))
328 return;
329
330 if (bfd_section_size (sect) == 0)
331 return;
332
333 /* Mostly a copy of bfd_simple_get_relocated_section_contents which GDB
334 cannot use as it does not report relocations to undefined symbols. */
335 memset (&link_info, 0, sizeof (link_info));
336 link_info.output_bfd = abfd;
337 link_info.input_bfds = abfd;
338 link_info.input_bfds_tail = &abfd->link.next;
339
340 struct link_hash_table_cleanup_data cleanup_data (abfd);
341
342 abfd->link.next = NULL;
343 link_info.hash = bfd_link_hash_table_create (abfd);
344
345 link_info.callbacks = &link_callbacks;
346
347 memset (&link_order, 0, sizeof (link_order));
348 link_order.next = NULL;
349 link_order.type = bfd_indirect_link_order;
350 link_order.offset = 0;
351 link_order.size = bfd_section_size (sect);
352 link_order.u.indirect.section = sect;
353
354 gdb::unique_xmalloc_ptr<gdb_byte> sect_data
355 ((bfd_byte *) xmalloc (bfd_section_size (sect)));
356
357 sect_data_got = bfd_get_relocated_section_contents (abfd, &link_info,
358 &link_order,
359 sect_data.get (),
360 FALSE, symbol_table);
361
362 if (sect_data_got == NULL)
363 error (_("Cannot map compiled module \"%s\" section \"%s\": %s"),
364 bfd_get_filename (abfd), bfd_section_name (sect),
365 bfd_errmsg (bfd_get_error ()));
366 gdb_assert (sect_data_got == sect_data.get ());
367
368 inferior_addr = bfd_section_vma (sect);
369 if (0 != target_write_memory (inferior_addr, sect_data.get (),
370 bfd_section_size (sect)))
371 error (_("Cannot write compiled module \"%s\" section \"%s\" "
372 "to inferior memory range %s-%s."),
373 bfd_get_filename (abfd), bfd_section_name (sect),
374 paddress (target_gdbarch (), inferior_addr),
375 paddress (target_gdbarch (),
376 inferior_addr + bfd_section_size (sect)));
377 }
378
379 /* Fetch the type of COMPILE_I_EXPR_PTR_TYPE and COMPILE_I_EXPR_VAL
380 symbols in OBJFILE so we can calculate how much memory to allocate
381 for the out parameter. This avoids needing a malloc in the generated
382 code. Throw an error if anything fails.
383 GDB first tries to compile the code with COMPILE_I_PRINT_ADDRESS_SCOPE.
384 If it finds user tries to print an array type this function returns
385 NULL. Caller will then regenerate the code with
386 COMPILE_I_PRINT_VALUE_SCOPE, recompiles it again and finally runs it.
387 This is because __auto_type array-to-pointer type conversion of
388 COMPILE_I_EXPR_VAL which gets detected by COMPILE_I_EXPR_PTR_TYPE
389 preserving the array type. */
390
391 static struct type *
get_out_value_type(struct symbol * func_sym,struct objfile * objfile,enum compile_i_scope_types scope)392 get_out_value_type (struct symbol *func_sym, struct objfile *objfile,
393 enum compile_i_scope_types scope)
394 {
395 struct symbol *gdb_ptr_type_sym;
396 /* Initialize it just to avoid a GCC false warning. */
397 struct symbol *gdb_val_sym = NULL;
398 struct type *gdb_ptr_type, *gdb_type_from_ptr, *gdb_type, *retval;
399 /* Initialize it just to avoid a GCC false warning. */
400 const struct block *block = NULL;
401 const struct blockvector *bv;
402 int nblocks = 0;
403 int block_loop = 0;
404
405 lookup_name_info func_matcher (GCC_FE_WRAPPER_FUNCTION,
406 symbol_name_match_type::SEARCH_NAME);
407
408 bv = SYMTAB_BLOCKVECTOR (func_sym->owner.symtab);
409 nblocks = BLOCKVECTOR_NBLOCKS (bv);
410
411 gdb_ptr_type_sym = NULL;
412 for (block_loop = 0; block_loop < nblocks; block_loop++)
413 {
414 struct symbol *function = NULL;
415 const struct block *function_block;
416
417 block = BLOCKVECTOR_BLOCK (bv, block_loop);
418 if (BLOCK_FUNCTION (block) != NULL)
419 continue;
420 gdb_val_sym = block_lookup_symbol (block,
421 COMPILE_I_EXPR_VAL,
422 symbol_name_match_type::SEARCH_NAME,
423 VAR_DOMAIN);
424 if (gdb_val_sym == NULL)
425 continue;
426
427 function_block = block;
428 while (function_block != BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)
429 && function_block != BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
430 {
431 function_block = BLOCK_SUPERBLOCK (function_block);
432 function = BLOCK_FUNCTION (function_block);
433 if (function != NULL)
434 break;
435 }
436 if (function != NULL
437 && (BLOCK_SUPERBLOCK (function_block)
438 == BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK))
439 && symbol_matches_search_name (function, func_matcher))
440 break;
441 }
442 if (block_loop == nblocks)
443 error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_VAL);
444
445 gdb_type = SYMBOL_TYPE (gdb_val_sym);
446 gdb_type = check_typedef (gdb_type);
447
448 gdb_ptr_type_sym = block_lookup_symbol (block, COMPILE_I_EXPR_PTR_TYPE,
449 symbol_name_match_type::SEARCH_NAME,
450 VAR_DOMAIN);
451 if (gdb_ptr_type_sym == NULL)
452 error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_PTR_TYPE);
453 gdb_ptr_type = SYMBOL_TYPE (gdb_ptr_type_sym);
454 gdb_ptr_type = check_typedef (gdb_ptr_type);
455 if (gdb_ptr_type->code () != TYPE_CODE_PTR)
456 error (_("Type of \"%s\" is not a pointer"), COMPILE_I_EXPR_PTR_TYPE);
457 gdb_type_from_ptr = check_typedef (TYPE_TARGET_TYPE (gdb_ptr_type));
458
459 if (types_deeply_equal (gdb_type, gdb_type_from_ptr))
460 {
461 if (scope != COMPILE_I_PRINT_ADDRESS_SCOPE)
462 error (_("Expected address scope in compiled module \"%s\"."),
463 objfile_name (objfile));
464 return gdb_type;
465 }
466
467 if (gdb_type->code () != TYPE_CODE_PTR)
468 error (_("Invalid type code %d of symbol \"%s\" "
469 "in compiled module \"%s\"."),
470 gdb_type_from_ptr->code (), COMPILE_I_EXPR_VAL,
471 objfile_name (objfile));
472
473 retval = gdb_type_from_ptr;
474 switch (gdb_type_from_ptr->code ())
475 {
476 case TYPE_CODE_ARRAY:
477 gdb_type_from_ptr = TYPE_TARGET_TYPE (gdb_type_from_ptr);
478 break;
479 case TYPE_CODE_FUNC:
480 break;
481 default:
482 error (_("Invalid type code %d of symbol \"%s\" "
483 "in compiled module \"%s\"."),
484 gdb_type_from_ptr->code (), COMPILE_I_EXPR_PTR_TYPE,
485 objfile_name (objfile));
486 }
487 if (!types_deeply_equal (gdb_type_from_ptr,
488 TYPE_TARGET_TYPE (gdb_type)))
489 error (_("Referenced types do not match for symbols \"%s\" and \"%s\" "
490 "in compiled module \"%s\"."),
491 COMPILE_I_EXPR_PTR_TYPE, COMPILE_I_EXPR_VAL,
492 objfile_name (objfile));
493 if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE)
494 return NULL;
495 return retval;
496 }
497
498 /* Fetch the type of first parameter of FUNC_SYM.
499 Return NULL if FUNC_SYM has no parameters. Throw an error otherwise. */
500
501 static struct type *
get_regs_type(struct symbol * func_sym,struct objfile * objfile)502 get_regs_type (struct symbol *func_sym, struct objfile *objfile)
503 {
504 struct type *func_type = SYMBOL_TYPE (func_sym);
505 struct type *regsp_type, *regs_type;
506
507 /* No register parameter present. */
508 if (func_type->num_fields () == 0)
509 return NULL;
510
511 regsp_type = check_typedef (func_type->field (0).type ());
512 if (regsp_type->code () != TYPE_CODE_PTR)
513 error (_("Invalid type code %d of first parameter of function \"%s\" "
514 "in compiled module \"%s\"."),
515 regsp_type->code (), GCC_FE_WRAPPER_FUNCTION,
516 objfile_name (objfile));
517
518 regs_type = check_typedef (TYPE_TARGET_TYPE (regsp_type));
519 if (regs_type->code () != TYPE_CODE_STRUCT)
520 error (_("Invalid type code %d of dereferenced first parameter "
521 "of function \"%s\" in compiled module \"%s\"."),
522 regs_type->code (), GCC_FE_WRAPPER_FUNCTION,
523 objfile_name (objfile));
524
525 return regs_type;
526 }
527
528 /* Store all inferior registers required by REGS_TYPE to inferior memory
529 starting at inferior address REGS_BASE. */
530
531 static void
store_regs(struct type * regs_type,CORE_ADDR regs_base)532 store_regs (struct type *regs_type, CORE_ADDR regs_base)
533 {
534 struct gdbarch *gdbarch = target_gdbarch ();
535 int fieldno;
536
537 for (fieldno = 0; fieldno < regs_type->num_fields (); fieldno++)
538 {
539 const char *reg_name = TYPE_FIELD_NAME (regs_type, fieldno);
540 ULONGEST reg_bitpos = TYPE_FIELD_BITPOS (regs_type, fieldno);
541 ULONGEST reg_bitsize = TYPE_FIELD_BITSIZE (regs_type, fieldno);
542 ULONGEST reg_offset;
543 struct type *reg_type
544 = check_typedef (regs_type->field (fieldno).type ());
545 ULONGEST reg_size = TYPE_LENGTH (reg_type);
546 int regnum;
547 struct value *regval;
548 CORE_ADDR inferior_addr;
549
550 if (strcmp (reg_name, COMPILE_I_SIMPLE_REGISTER_DUMMY) == 0)
551 continue;
552
553 if ((reg_bitpos % 8) != 0 || reg_bitsize != 0)
554 error (_("Invalid register \"%s\" position %s bits or size %s bits"),
555 reg_name, pulongest (reg_bitpos), pulongest (reg_bitsize));
556 reg_offset = reg_bitpos / 8;
557
558 if (reg_type->code () != TYPE_CODE_INT
559 && reg_type->code () != TYPE_CODE_PTR)
560 error (_("Invalid register \"%s\" type code %d"), reg_name,
561 reg_type->code ());
562
563 regnum = compile_register_name_demangle (gdbarch, reg_name);
564
565 regval = value_from_register (reg_type, regnum, get_current_frame ());
566 if (value_optimized_out (regval))
567 error (_("Register \"%s\" is optimized out."), reg_name);
568 if (!value_entirely_available (regval))
569 error (_("Register \"%s\" is not available."), reg_name);
570
571 inferior_addr = regs_base + reg_offset;
572 if (0 != target_write_memory (inferior_addr, value_contents (regval),
573 reg_size))
574 error (_("Cannot write register \"%s\" to inferior memory at %s."),
575 reg_name, paddress (gdbarch, inferior_addr));
576 }
577 }
578
579 /* Load the object file specified in FILE_NAMES into inferior memory.
580 Throw an error otherwise. Caller must fully dispose the return
581 value by calling compile_object_run. Returns NULL only for
582 COMPILE_I_PRINT_ADDRESS_SCOPE when COMPILE_I_PRINT_VALUE_SCOPE
583 should have been used instead. */
584
585 struct compile_module *
compile_object_load(const compile_file_names & file_names,enum compile_i_scope_types scope,void * scope_data)586 compile_object_load (const compile_file_names &file_names,
587 enum compile_i_scope_types scope, void *scope_data)
588 {
589 struct setup_sections_data setup_sections_data;
590 CORE_ADDR regs_addr, out_value_addr = 0;
591 struct symbol *func_sym;
592 struct type *func_type;
593 struct bound_minimal_symbol bmsym;
594 long storage_needed;
595 asymbol **symbol_table, **symp;
596 long number_of_symbols, missing_symbols;
597 struct compile_module *retval;
598 struct type *regs_type, *out_value_type = NULL;
599 char **matching;
600 struct objfile *objfile;
601 int expect_parameters;
602 struct type *expect_return_type;
603
604 gdb::unique_xmalloc_ptr<char> filename
605 (tilde_expand (file_names.object_file ()));
606
607 gdb_bfd_ref_ptr abfd (gdb_bfd_open (filename.get (), gnutarget));
608 if (abfd == NULL)
609 error (_("\"%s\": could not open as compiled module: %s"),
610 filename.get (), bfd_errmsg (bfd_get_error ()));
611
612 if (!bfd_check_format_matches (abfd.get (), bfd_object, &matching))
613 error (_("\"%s\": not in loadable format: %s"),
614 filename.get (),
615 gdb_bfd_errmsg (bfd_get_error (), matching).c_str ());
616
617 if ((bfd_get_file_flags (abfd.get ()) & (EXEC_P | DYNAMIC)) != 0)
618 error (_("\"%s\": not in object format."), filename.get ());
619
620 setup_sections_data.last_size = 0;
621 setup_sections_data.last_section_first = abfd->sections;
622 setup_sections_data.last_prot = -1;
623 setup_sections_data.last_max_alignment = 1;
624 setup_sections_data.munmap_list.reset (new struct munmap_list);
625
626 bfd_map_over_sections (abfd.get (), setup_sections, &setup_sections_data);
627 setup_sections (abfd.get (), NULL, &setup_sections_data);
628
629 storage_needed = bfd_get_symtab_upper_bound (abfd.get ());
630 if (storage_needed < 0)
631 error (_("Cannot read symbols of compiled module \"%s\": %s"),
632 filename.get (), bfd_errmsg (bfd_get_error ()));
633
634 /* SYMFILE_VERBOSE is not passed even if FROM_TTY, user is not interested in
635 "Reading symbols from ..." message for automatically generated file. */
636 objfile_up objfile_holder (symbol_file_add_from_bfd (abfd.get (),
637 filename.get (),
638 0, NULL, 0, NULL));
639 objfile = objfile_holder.get ();
640
641 func_sym = lookup_global_symbol_from_objfile (objfile,
642 GLOBAL_BLOCK,
643 GCC_FE_WRAPPER_FUNCTION,
644 VAR_DOMAIN).symbol;
645 if (func_sym == NULL)
646 error (_("Cannot find function \"%s\" in compiled module \"%s\"."),
647 GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
648 func_type = SYMBOL_TYPE (func_sym);
649 if (func_type->code () != TYPE_CODE_FUNC)
650 error (_("Invalid type code %d of function \"%s\" in compiled "
651 "module \"%s\"."),
652 func_type->code (), GCC_FE_WRAPPER_FUNCTION,
653 objfile_name (objfile));
654
655 switch (scope)
656 {
657 case COMPILE_I_SIMPLE_SCOPE:
658 expect_parameters = 1;
659 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
660 break;
661 case COMPILE_I_RAW_SCOPE:
662 expect_parameters = 0;
663 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
664 break;
665 case COMPILE_I_PRINT_ADDRESS_SCOPE:
666 case COMPILE_I_PRINT_VALUE_SCOPE:
667 expect_parameters = 2;
668 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
669 break;
670 default:
671 internal_error (__FILE__, __LINE__, _("invalid scope %d"), scope);
672 }
673 if (func_type->num_fields () != expect_parameters)
674 error (_("Invalid %d parameters of function \"%s\" in compiled "
675 "module \"%s\"."),
676 func_type->num_fields (), GCC_FE_WRAPPER_FUNCTION,
677 objfile_name (objfile));
678 if (!types_deeply_equal (expect_return_type, TYPE_TARGET_TYPE (func_type)))
679 error (_("Invalid return type of function \"%s\" in compiled "
680 "module \"%s\"."),
681 GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
682
683 /* The memory may be later needed
684 by bfd_generic_get_relocated_section_contents
685 called from default_symfile_relocate. */
686 symbol_table = (asymbol **) obstack_alloc (&objfile->objfile_obstack,
687 storage_needed);
688 number_of_symbols = bfd_canonicalize_symtab (abfd.get (), symbol_table);
689 if (number_of_symbols < 0)
690 error (_("Cannot parse symbols of compiled module \"%s\": %s"),
691 filename.get (), bfd_errmsg (bfd_get_error ()));
692
693 missing_symbols = 0;
694 for (symp = symbol_table; symp < symbol_table + number_of_symbols; symp++)
695 {
696 asymbol *sym = *symp;
697
698 if (sym->flags != 0)
699 continue;
700 sym->flags = BSF_GLOBAL;
701 sym->section = bfd_abs_section_ptr;
702 if (strcmp (sym->name, "_GLOBAL_OFFSET_TABLE_") == 0)
703 {
704 if (compile_debug)
705 fprintf_unfiltered (gdb_stdlog,
706 "ELF symbol \"%s\" relocated to zero\n",
707 sym->name);
708
709 /* It seems to be a GCC bug, with -mcmodel=large there should be no
710 need for _GLOBAL_OFFSET_TABLE_. Together with -fPIE the data
711 remain PC-relative even with _GLOBAL_OFFSET_TABLE_ as zero. */
712 sym->value = 0;
713 continue;
714 }
715 bmsym = lookup_minimal_symbol (sym->name, NULL, NULL);
716 switch (bmsym.minsym == NULL
717 ? mst_unknown : MSYMBOL_TYPE (bmsym.minsym))
718 {
719 case mst_text:
720 case mst_bss:
721 case mst_data:
722 sym->value = BMSYMBOL_VALUE_ADDRESS (bmsym);
723 if (compile_debug)
724 fprintf_unfiltered (gdb_stdlog,
725 "ELF mst_text symbol \"%s\" relocated to %s\n",
726 sym->name,
727 paddress (target_gdbarch (), sym->value));
728 break;
729 case mst_text_gnu_ifunc:
730 sym->value = gnu_ifunc_resolve_addr (target_gdbarch (),
731 BMSYMBOL_VALUE_ADDRESS (bmsym));
732 if (compile_debug)
733 fprintf_unfiltered (gdb_stdlog,
734 "ELF mst_text_gnu_ifunc symbol \"%s\" "
735 "relocated to %s\n",
736 sym->name,
737 paddress (target_gdbarch (), sym->value));
738 break;
739 default:
740 warning (_("Could not find symbol \"%s\" "
741 "for compiled module \"%s\"."),
742 sym->name, filename.get ());
743 missing_symbols++;
744 }
745 }
746 if (missing_symbols)
747 error (_("%ld symbols were missing, cannot continue."), missing_symbols);
748
749 bfd_map_over_sections (abfd.get (), copy_sections, symbol_table);
750
751 regs_type = get_regs_type (func_sym, objfile);
752 if (regs_type == NULL)
753 regs_addr = 0;
754 else
755 {
756 /* Use read-only non-executable memory protection. */
757 regs_addr = gdbarch_infcall_mmap (target_gdbarch (),
758 TYPE_LENGTH (regs_type),
759 GDB_MMAP_PROT_READ);
760 gdb_assert (regs_addr != 0);
761 setup_sections_data.munmap_list->add (regs_addr, TYPE_LENGTH (regs_type));
762 if (compile_debug)
763 fprintf_unfiltered (gdb_stdlog,
764 "allocated %s bytes at %s for registers\n",
765 paddress (target_gdbarch (),
766 TYPE_LENGTH (regs_type)),
767 paddress (target_gdbarch (), regs_addr));
768 store_regs (regs_type, regs_addr);
769 }
770
771 if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE
772 || scope == COMPILE_I_PRINT_VALUE_SCOPE)
773 {
774 out_value_type = get_out_value_type (func_sym, objfile, scope);
775 if (out_value_type == NULL)
776 return NULL;
777 check_typedef (out_value_type);
778 out_value_addr = gdbarch_infcall_mmap (target_gdbarch (),
779 TYPE_LENGTH (out_value_type),
780 (GDB_MMAP_PROT_READ
781 | GDB_MMAP_PROT_WRITE));
782 gdb_assert (out_value_addr != 0);
783 setup_sections_data.munmap_list->add (out_value_addr,
784 TYPE_LENGTH (out_value_type));
785 if (compile_debug)
786 fprintf_unfiltered (gdb_stdlog,
787 "allocated %s bytes at %s for printed value\n",
788 paddress (target_gdbarch (),
789 TYPE_LENGTH (out_value_type)),
790 paddress (target_gdbarch (), out_value_addr));
791 }
792
793 retval = XNEW (struct compile_module);
794 retval->objfile = objfile_holder.release ();
795 retval->source_file = xstrdup (file_names.source_file ());
796 retval->func_sym = func_sym;
797 retval->regs_addr = regs_addr;
798 retval->scope = scope;
799 retval->scope_data = scope_data;
800 retval->out_value_type = out_value_type;
801 retval->out_value_addr = out_value_addr;
802 retval->munmap_list_head = setup_sections_data.munmap_list.release ();
803
804 return retval;
805 }
806