1 /* Load module for 'compile' command.
2
3 Copyright (C) 2014-2021 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 /* A data structure that is used to lay out sections of our objfile in
66 inferior memory. */
67
68 struct setup_sections_data
69 {
setup_sections_datasetup_sections_data70 explicit setup_sections_data (bfd *abfd)
71 : m_bfd (abfd),
72 m_last_section_first (abfd->sections)
73 {
74 }
75
76 /* Place all ABFD sections next to each other obeying all
77 constraints. */
78 void setup_one_section (asection *sect);
79
80 /* List of inferior mmap ranges where setup_sections should add its
81 next range. */
82 struct munmap_list munmap_list;
83
84 private:
85
86 /* The BFD. */
87 bfd *m_bfd;
88
89 /* Size of all recent sections with matching LAST_PROT. */
90 CORE_ADDR m_last_size = 0;
91
92 /* First section matching LAST_PROT. */
93 asection *m_last_section_first;
94
95 /* Memory protection like the prot parameter of gdbarch_infcall_mmap. */
96 unsigned m_last_prot = -1;
97
98 /* Maximum of alignments of all sections matching LAST_PROT.
99 This value is always at least 1. This value is always a power of 2. */
100 CORE_ADDR m_last_max_alignment = -1;
101
102 };
103
104 /* See setup_sections_data. */
105
106 void
setup_one_section(asection * sect)107 setup_sections_data::setup_one_section (asection *sect)
108 {
109 CORE_ADDR alignment;
110 unsigned prot;
111
112 if (sect != NULL)
113 {
114 /* It is required by later bfd_get_relocated_section_contents. */
115 if (sect->output_section == NULL)
116 sect->output_section = sect;
117
118 if ((bfd_section_flags (sect) & SEC_ALLOC) == 0)
119 return;
120
121 /* Make the memory always readable. */
122 prot = GDB_MMAP_PROT_READ;
123 if ((bfd_section_flags (sect) & SEC_READONLY) == 0)
124 prot |= GDB_MMAP_PROT_WRITE;
125 if ((bfd_section_flags (sect) & SEC_CODE) != 0)
126 prot |= GDB_MMAP_PROT_EXEC;
127
128 if (compile_debug)
129 fprintf_unfiltered (gdb_stdlog,
130 "module \"%s\" section \"%s\" size %s prot %u\n",
131 bfd_get_filename (m_bfd),
132 bfd_section_name (sect),
133 paddress (target_gdbarch (),
134 bfd_section_size (sect)),
135 prot);
136 }
137 else
138 prot = -1;
139
140 if (sect == NULL
141 || (m_last_prot != prot && bfd_section_size (sect) != 0))
142 {
143 CORE_ADDR addr;
144 asection *sect_iter;
145
146 if (m_last_size != 0)
147 {
148 addr = gdbarch_infcall_mmap (target_gdbarch (), m_last_size,
149 m_last_prot);
150 munmap_list.add (addr, m_last_size);
151 if (compile_debug)
152 fprintf_unfiltered (gdb_stdlog,
153 "allocated %s bytes at %s prot %u\n",
154 paddress (target_gdbarch (), m_last_size),
155 paddress (target_gdbarch (), addr),
156 m_last_prot);
157 }
158 else
159 addr = 0;
160
161 if ((addr & (m_last_max_alignment - 1)) != 0)
162 error (_("Inferior compiled module address %s "
163 "is not aligned to BFD required %s."),
164 paddress (target_gdbarch (), addr),
165 paddress (target_gdbarch (), m_last_max_alignment));
166
167 for (sect_iter = m_last_section_first; sect_iter != sect;
168 sect_iter = sect_iter->next)
169 if ((bfd_section_flags (sect_iter) & SEC_ALLOC) != 0)
170 bfd_set_section_vma (sect_iter, addr + bfd_section_vma (sect_iter));
171
172 m_last_size = 0;
173 m_last_section_first = sect;
174 m_last_prot = prot;
175 m_last_max_alignment = 1;
176 }
177
178 if (sect == NULL)
179 return;
180
181 alignment = ((CORE_ADDR) 1) << bfd_section_alignment (sect);
182 m_last_max_alignment = std::max (m_last_max_alignment, alignment);
183
184 m_last_size = (m_last_size + alignment - 1) & -alignment;
185
186 bfd_set_section_vma (sect, m_last_size);
187
188 m_last_size += bfd_section_size (sect);
189 m_last_size = (m_last_size + alignment - 1) & -alignment;
190 }
191
192 /* Helper for link_callbacks callbacks vector. */
193
194 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)195 link_callbacks_multiple_definition (struct bfd_link_info *link_info,
196 struct bfd_link_hash_entry *h, bfd *nbfd,
197 asection *nsec, bfd_vma nval)
198 {
199 bfd *abfd = link_info->input_bfds;
200
201 if (link_info->allow_multiple_definition)
202 return;
203 warning (_("Compiled module \"%s\": multiple symbol definitions: %s"),
204 bfd_get_filename (abfd), h->root.string);
205 }
206
207 /* Helper for link_callbacks callbacks vector. */
208
209 static void
link_callbacks_warning(struct bfd_link_info * link_info,const char * xwarning,const char * symbol,bfd * abfd,asection * section,bfd_vma address)210 link_callbacks_warning (struct bfd_link_info *link_info, const char *xwarning,
211 const char *symbol, bfd *abfd, asection *section,
212 bfd_vma address)
213 {
214 warning (_("Compiled module \"%s\" section \"%s\": warning: %s"),
215 bfd_get_filename (abfd), bfd_section_name (section),
216 xwarning);
217 }
218
219 /* Helper for link_callbacks callbacks vector. */
220
221 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)222 link_callbacks_undefined_symbol (struct bfd_link_info *link_info,
223 const char *name, bfd *abfd, asection *section,
224 bfd_vma address, bfd_boolean is_fatal)
225 {
226 warning (_("Cannot resolve relocation to \"%s\" "
227 "from compiled module \"%s\" section \"%s\"."),
228 name, bfd_get_filename (abfd), bfd_section_name (section));
229 }
230
231 /* Helper for link_callbacks callbacks vector. */
232
233 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)234 link_callbacks_reloc_overflow (struct bfd_link_info *link_info,
235 struct bfd_link_hash_entry *entry,
236 const char *name, const char *reloc_name,
237 bfd_vma addend, bfd *abfd, asection *section,
238 bfd_vma address)
239 {
240 }
241
242 /* Helper for link_callbacks callbacks vector. */
243
244 static void
link_callbacks_reloc_dangerous(struct bfd_link_info * link_info,const char * message,bfd * abfd,asection * section,bfd_vma address)245 link_callbacks_reloc_dangerous (struct bfd_link_info *link_info,
246 const char *message, bfd *abfd,
247 asection *section, bfd_vma address)
248 {
249 warning (_("Compiled module \"%s\" section \"%s\": dangerous "
250 "relocation: %s\n"),
251 bfd_get_filename (abfd), bfd_section_name (section),
252 message);
253 }
254
255 /* Helper for link_callbacks callbacks vector. */
256
257 static void
link_callbacks_unattached_reloc(struct bfd_link_info * link_info,const char * name,bfd * abfd,asection * section,bfd_vma address)258 link_callbacks_unattached_reloc (struct bfd_link_info *link_info,
259 const char *name, bfd *abfd, asection *section,
260 bfd_vma address)
261 {
262 warning (_("Compiled module \"%s\" section \"%s\": unattached "
263 "relocation: %s\n"),
264 bfd_get_filename (abfd), bfd_section_name (section),
265 name);
266 }
267
268 /* Helper for link_callbacks callbacks vector. */
269
270 static void link_callbacks_einfo (const char *fmt, ...)
271 ATTRIBUTE_PRINTF (1, 2);
272
273 static void
link_callbacks_einfo(const char * fmt,...)274 link_callbacks_einfo (const char *fmt, ...)
275 {
276 va_list ap;
277
278 va_start (ap, fmt);
279 std::string str = string_vprintf (fmt, ap);
280 va_end (ap);
281
282 warning (_("Compile module: warning: %s"), str.c_str ());
283 }
284
285 /* Helper for bfd_get_relocated_section_contents.
286 Only these symbols are set by bfd_simple_get_relocated_section_contents
287 but bfd/ seems to use even the NULL ones without checking them first. */
288
289 static const struct bfd_link_callbacks link_callbacks =
290 {
291 NULL, /* add_archive_element */
292 link_callbacks_multiple_definition, /* multiple_definition */
293 NULL, /* multiple_common */
294 NULL, /* add_to_set */
295 NULL, /* constructor */
296 link_callbacks_warning, /* warning */
297 link_callbacks_undefined_symbol, /* undefined_symbol */
298 link_callbacks_reloc_overflow, /* reloc_overflow */
299 link_callbacks_reloc_dangerous, /* reloc_dangerous */
300 link_callbacks_unattached_reloc, /* unattached_reloc */
301 NULL, /* notice */
302 link_callbacks_einfo, /* einfo */
303 NULL, /* info */
304 NULL, /* minfo */
305 NULL, /* override_segment_assignment */
306 };
307
308 struct link_hash_table_cleanup_data
309 {
link_hash_table_cleanup_datalink_hash_table_cleanup_data310 explicit link_hash_table_cleanup_data (bfd *abfd_)
311 : abfd (abfd_),
312 link_next (abfd->link.next)
313 {
314 }
315
~link_hash_table_cleanup_datalink_hash_table_cleanup_data316 ~link_hash_table_cleanup_data ()
317 {
318 if (abfd->is_linker_output)
319 (*abfd->link.hash->hash_table_free) (abfd);
320 abfd->link.next = link_next;
321 }
322
323 DISABLE_COPY_AND_ASSIGN (link_hash_table_cleanup_data);
324
325 private:
326
327 bfd *abfd;
328 bfd *link_next;
329 };
330
331 /* Relocate and store into inferior memory each section SECT of ABFD. */
332
333 static void
copy_sections(bfd * abfd,asection * sect,void * data)334 copy_sections (bfd *abfd, asection *sect, void *data)
335 {
336 asymbol **symbol_table = (asymbol **) data;
337 bfd_byte *sect_data_got;
338 struct bfd_link_info link_info;
339 struct bfd_link_order link_order;
340 CORE_ADDR inferior_addr;
341
342 if ((bfd_section_flags (sect) & (SEC_ALLOC | SEC_LOAD))
343 != (SEC_ALLOC | SEC_LOAD))
344 return;
345
346 if (bfd_section_size (sect) == 0)
347 return;
348
349 /* Mostly a copy of bfd_simple_get_relocated_section_contents which GDB
350 cannot use as it does not report relocations to undefined symbols. */
351 memset (&link_info, 0, sizeof (link_info));
352 link_info.output_bfd = abfd;
353 link_info.input_bfds = abfd;
354 link_info.input_bfds_tail = &abfd->link.next;
355
356 struct link_hash_table_cleanup_data cleanup_data (abfd);
357
358 abfd->link.next = NULL;
359 link_info.hash = bfd_link_hash_table_create (abfd);
360
361 link_info.callbacks = &link_callbacks;
362
363 memset (&link_order, 0, sizeof (link_order));
364 link_order.next = NULL;
365 link_order.type = bfd_indirect_link_order;
366 link_order.offset = 0;
367 link_order.size = bfd_section_size (sect);
368 link_order.u.indirect.section = sect;
369
370 gdb::unique_xmalloc_ptr<gdb_byte> sect_data
371 ((bfd_byte *) xmalloc (bfd_section_size (sect)));
372
373 sect_data_got = bfd_get_relocated_section_contents (abfd, &link_info,
374 &link_order,
375 sect_data.get (),
376 FALSE, symbol_table);
377
378 if (sect_data_got == NULL)
379 error (_("Cannot map compiled module \"%s\" section \"%s\": %s"),
380 bfd_get_filename (abfd), bfd_section_name (sect),
381 bfd_errmsg (bfd_get_error ()));
382 gdb_assert (sect_data_got == sect_data.get ());
383
384 inferior_addr = bfd_section_vma (sect);
385 if (0 != target_write_memory (inferior_addr, sect_data.get (),
386 bfd_section_size (sect)))
387 error (_("Cannot write compiled module \"%s\" section \"%s\" "
388 "to inferior memory range %s-%s."),
389 bfd_get_filename (abfd), bfd_section_name (sect),
390 paddress (target_gdbarch (), inferior_addr),
391 paddress (target_gdbarch (),
392 inferior_addr + bfd_section_size (sect)));
393 }
394
395 /* Fetch the type of COMPILE_I_EXPR_PTR_TYPE and COMPILE_I_EXPR_VAL
396 symbols in OBJFILE so we can calculate how much memory to allocate
397 for the out parameter. This avoids needing a malloc in the generated
398 code. Throw an error if anything fails.
399 GDB first tries to compile the code with COMPILE_I_PRINT_ADDRESS_SCOPE.
400 If it finds user tries to print an array type this function returns
401 NULL. Caller will then regenerate the code with
402 COMPILE_I_PRINT_VALUE_SCOPE, recompiles it again and finally runs it.
403 This is because __auto_type array-to-pointer type conversion of
404 COMPILE_I_EXPR_VAL which gets detected by COMPILE_I_EXPR_PTR_TYPE
405 preserving the array type. */
406
407 static struct type *
get_out_value_type(struct symbol * func_sym,struct objfile * objfile,enum compile_i_scope_types scope)408 get_out_value_type (struct symbol *func_sym, struct objfile *objfile,
409 enum compile_i_scope_types scope)
410 {
411 struct symbol *gdb_ptr_type_sym;
412 /* Initialize it just to avoid a GCC false warning. */
413 struct symbol *gdb_val_sym = NULL;
414 struct type *gdb_ptr_type, *gdb_type_from_ptr, *gdb_type, *retval;
415 /* Initialize it just to avoid a GCC false warning. */
416 const struct block *block = NULL;
417 const struct blockvector *bv;
418 int nblocks = 0;
419 int block_loop = 0;
420
421 lookup_name_info func_matcher (GCC_FE_WRAPPER_FUNCTION,
422 symbol_name_match_type::SEARCH_NAME);
423
424 bv = SYMTAB_BLOCKVECTOR (func_sym->owner.symtab);
425 nblocks = BLOCKVECTOR_NBLOCKS (bv);
426
427 gdb_ptr_type_sym = NULL;
428 for (block_loop = 0; block_loop < nblocks; block_loop++)
429 {
430 struct symbol *function = NULL;
431 const struct block *function_block;
432
433 block = BLOCKVECTOR_BLOCK (bv, block_loop);
434 if (BLOCK_FUNCTION (block) != NULL)
435 continue;
436 gdb_val_sym = block_lookup_symbol (block,
437 COMPILE_I_EXPR_VAL,
438 symbol_name_match_type::SEARCH_NAME,
439 VAR_DOMAIN);
440 if (gdb_val_sym == NULL)
441 continue;
442
443 function_block = block;
444 while (function_block != BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)
445 && function_block != BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
446 {
447 function_block = BLOCK_SUPERBLOCK (function_block);
448 function = BLOCK_FUNCTION (function_block);
449 if (function != NULL)
450 break;
451 }
452 if (function != NULL
453 && (BLOCK_SUPERBLOCK (function_block)
454 == BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK))
455 && symbol_matches_search_name (function, func_matcher))
456 break;
457 }
458 if (block_loop == nblocks)
459 error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_VAL);
460
461 gdb_type = SYMBOL_TYPE (gdb_val_sym);
462 gdb_type = check_typedef (gdb_type);
463
464 gdb_ptr_type_sym = block_lookup_symbol (block, COMPILE_I_EXPR_PTR_TYPE,
465 symbol_name_match_type::SEARCH_NAME,
466 VAR_DOMAIN);
467 if (gdb_ptr_type_sym == NULL)
468 error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_PTR_TYPE);
469 gdb_ptr_type = SYMBOL_TYPE (gdb_ptr_type_sym);
470 gdb_ptr_type = check_typedef (gdb_ptr_type);
471 if (gdb_ptr_type->code () != TYPE_CODE_PTR)
472 error (_("Type of \"%s\" is not a pointer"), COMPILE_I_EXPR_PTR_TYPE);
473 gdb_type_from_ptr = check_typedef (TYPE_TARGET_TYPE (gdb_ptr_type));
474
475 if (types_deeply_equal (gdb_type, gdb_type_from_ptr))
476 {
477 if (scope != COMPILE_I_PRINT_ADDRESS_SCOPE)
478 error (_("Expected address scope in compiled module \"%s\"."),
479 objfile_name (objfile));
480 return gdb_type;
481 }
482
483 if (gdb_type->code () != TYPE_CODE_PTR)
484 error (_("Invalid type code %d of symbol \"%s\" "
485 "in compiled module \"%s\"."),
486 gdb_type_from_ptr->code (), COMPILE_I_EXPR_VAL,
487 objfile_name (objfile));
488
489 retval = gdb_type_from_ptr;
490 switch (gdb_type_from_ptr->code ())
491 {
492 case TYPE_CODE_ARRAY:
493 gdb_type_from_ptr = TYPE_TARGET_TYPE (gdb_type_from_ptr);
494 break;
495 case TYPE_CODE_FUNC:
496 break;
497 default:
498 error (_("Invalid type code %d of symbol \"%s\" "
499 "in compiled module \"%s\"."),
500 gdb_type_from_ptr->code (), COMPILE_I_EXPR_PTR_TYPE,
501 objfile_name (objfile));
502 }
503 if (!types_deeply_equal (gdb_type_from_ptr,
504 TYPE_TARGET_TYPE (gdb_type)))
505 error (_("Referenced types do not match for symbols \"%s\" and \"%s\" "
506 "in compiled module \"%s\"."),
507 COMPILE_I_EXPR_PTR_TYPE, COMPILE_I_EXPR_VAL,
508 objfile_name (objfile));
509 if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE)
510 return NULL;
511 return retval;
512 }
513
514 /* Fetch the type of first parameter of FUNC_SYM.
515 Return NULL if FUNC_SYM has no parameters. Throw an error otherwise. */
516
517 static struct type *
get_regs_type(struct symbol * func_sym,struct objfile * objfile)518 get_regs_type (struct symbol *func_sym, struct objfile *objfile)
519 {
520 struct type *func_type = SYMBOL_TYPE (func_sym);
521 struct type *regsp_type, *regs_type;
522
523 /* No register parameter present. */
524 if (func_type->num_fields () == 0)
525 return NULL;
526
527 regsp_type = check_typedef (func_type->field (0).type ());
528 if (regsp_type->code () != TYPE_CODE_PTR)
529 error (_("Invalid type code %d of first parameter of function \"%s\" "
530 "in compiled module \"%s\"."),
531 regsp_type->code (), GCC_FE_WRAPPER_FUNCTION,
532 objfile_name (objfile));
533
534 regs_type = check_typedef (TYPE_TARGET_TYPE (regsp_type));
535 if (regs_type->code () != TYPE_CODE_STRUCT)
536 error (_("Invalid type code %d of dereferenced first parameter "
537 "of function \"%s\" in compiled module \"%s\"."),
538 regs_type->code (), GCC_FE_WRAPPER_FUNCTION,
539 objfile_name (objfile));
540
541 return regs_type;
542 }
543
544 /* Store all inferior registers required by REGS_TYPE to inferior memory
545 starting at inferior address REGS_BASE. */
546
547 static void
store_regs(struct type * regs_type,CORE_ADDR regs_base)548 store_regs (struct type *regs_type, CORE_ADDR regs_base)
549 {
550 struct gdbarch *gdbarch = target_gdbarch ();
551 int fieldno;
552
553 for (fieldno = 0; fieldno < regs_type->num_fields (); fieldno++)
554 {
555 const char *reg_name = TYPE_FIELD_NAME (regs_type, fieldno);
556 ULONGEST reg_bitpos = TYPE_FIELD_BITPOS (regs_type, fieldno);
557 ULONGEST reg_bitsize = TYPE_FIELD_BITSIZE (regs_type, fieldno);
558 ULONGEST reg_offset;
559 struct type *reg_type
560 = check_typedef (regs_type->field (fieldno).type ());
561 ULONGEST reg_size = TYPE_LENGTH (reg_type);
562 int regnum;
563 struct value *regval;
564 CORE_ADDR inferior_addr;
565
566 if (strcmp (reg_name, COMPILE_I_SIMPLE_REGISTER_DUMMY) == 0)
567 continue;
568
569 if ((reg_bitpos % 8) != 0 || reg_bitsize != 0)
570 error (_("Invalid register \"%s\" position %s bits or size %s bits"),
571 reg_name, pulongest (reg_bitpos), pulongest (reg_bitsize));
572 reg_offset = reg_bitpos / 8;
573
574 if (reg_type->code () != TYPE_CODE_INT
575 && reg_type->code () != TYPE_CODE_PTR)
576 error (_("Invalid register \"%s\" type code %d"), reg_name,
577 reg_type->code ());
578
579 regnum = compile_register_name_demangle (gdbarch, reg_name);
580
581 regval = value_from_register (reg_type, regnum, get_current_frame ());
582 if (value_optimized_out (regval))
583 error (_("Register \"%s\" is optimized out."), reg_name);
584 if (!value_entirely_available (regval))
585 error (_("Register \"%s\" is not available."), reg_name);
586
587 inferior_addr = regs_base + reg_offset;
588 if (0 != target_write_memory (inferior_addr, value_contents (regval),
589 reg_size))
590 error (_("Cannot write register \"%s\" to inferior memory at %s."),
591 reg_name, paddress (gdbarch, inferior_addr));
592 }
593 }
594
595 /* Load the object file specified in FILE_NAMES into inferior memory.
596 Throw an error otherwise. Caller must fully dispose the return
597 value by calling compile_object_run. Returns NULL only for
598 COMPILE_I_PRINT_ADDRESS_SCOPE when COMPILE_I_PRINT_VALUE_SCOPE
599 should have been used instead. */
600
601 compile_module_up
compile_object_load(const compile_file_names & file_names,enum compile_i_scope_types scope,void * scope_data)602 compile_object_load (const compile_file_names &file_names,
603 enum compile_i_scope_types scope, void *scope_data)
604 {
605 CORE_ADDR regs_addr, out_value_addr = 0;
606 struct symbol *func_sym;
607 struct type *func_type;
608 struct bound_minimal_symbol bmsym;
609 long storage_needed;
610 asymbol **symbol_table, **symp;
611 long number_of_symbols, missing_symbols;
612 struct type *regs_type, *out_value_type = NULL;
613 char **matching;
614 struct objfile *objfile;
615 int expect_parameters;
616 struct type *expect_return_type;
617
618 gdb::unique_xmalloc_ptr<char> filename
619 (tilde_expand (file_names.object_file ()));
620
621 gdb_bfd_ref_ptr abfd (gdb_bfd_open (filename.get (), gnutarget));
622 if (abfd == NULL)
623 error (_("\"%s\": could not open as compiled module: %s"),
624 filename.get (), bfd_errmsg (bfd_get_error ()));
625
626 if (!bfd_check_format_matches (abfd.get (), bfd_object, &matching))
627 error (_("\"%s\": not in loadable format: %s"),
628 filename.get (),
629 gdb_bfd_errmsg (bfd_get_error (), matching).c_str ());
630
631 if ((bfd_get_file_flags (abfd.get ()) & (EXEC_P | DYNAMIC)) != 0)
632 error (_("\"%s\": not in object format."), filename.get ());
633
634 struct setup_sections_data setup_sections_data (abfd.get ());
635 for (asection *sect = abfd->sections; sect != nullptr; sect = sect->next)
636 setup_sections_data.setup_one_section (sect);
637 setup_sections_data.setup_one_section (nullptr);
638
639 storage_needed = bfd_get_symtab_upper_bound (abfd.get ());
640 if (storage_needed < 0)
641 error (_("Cannot read symbols of compiled module \"%s\": %s"),
642 filename.get (), bfd_errmsg (bfd_get_error ()));
643
644 /* SYMFILE_VERBOSE is not passed even if FROM_TTY, user is not interested in
645 "Reading symbols from ..." message for automatically generated file. */
646 objfile_up objfile_holder (symbol_file_add_from_bfd (abfd.get (),
647 filename.get (),
648 0, NULL, 0, NULL));
649 objfile = objfile_holder.get ();
650
651 func_sym = lookup_global_symbol_from_objfile (objfile,
652 GLOBAL_BLOCK,
653 GCC_FE_WRAPPER_FUNCTION,
654 VAR_DOMAIN).symbol;
655 if (func_sym == NULL)
656 error (_("Cannot find function \"%s\" in compiled module \"%s\"."),
657 GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
658 func_type = SYMBOL_TYPE (func_sym);
659 if (func_type->code () != TYPE_CODE_FUNC)
660 error (_("Invalid type code %d of function \"%s\" in compiled "
661 "module \"%s\"."),
662 func_type->code (), GCC_FE_WRAPPER_FUNCTION,
663 objfile_name (objfile));
664
665 switch (scope)
666 {
667 case COMPILE_I_SIMPLE_SCOPE:
668 expect_parameters = 1;
669 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
670 break;
671 case COMPILE_I_RAW_SCOPE:
672 expect_parameters = 0;
673 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
674 break;
675 case COMPILE_I_PRINT_ADDRESS_SCOPE:
676 case COMPILE_I_PRINT_VALUE_SCOPE:
677 expect_parameters = 2;
678 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
679 break;
680 default:
681 internal_error (__FILE__, __LINE__, _("invalid scope %d"), scope);
682 }
683 if (func_type->num_fields () != expect_parameters)
684 error (_("Invalid %d parameters of function \"%s\" in compiled "
685 "module \"%s\"."),
686 func_type->num_fields (), GCC_FE_WRAPPER_FUNCTION,
687 objfile_name (objfile));
688 if (!types_deeply_equal (expect_return_type, TYPE_TARGET_TYPE (func_type)))
689 error (_("Invalid return type of function \"%s\" in compiled "
690 "module \"%s\"."),
691 GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
692
693 /* The memory may be later needed
694 by bfd_generic_get_relocated_section_contents
695 called from default_symfile_relocate. */
696 symbol_table = (asymbol **) obstack_alloc (&objfile->objfile_obstack,
697 storage_needed);
698 number_of_symbols = bfd_canonicalize_symtab (abfd.get (), symbol_table);
699 if (number_of_symbols < 0)
700 error (_("Cannot parse symbols of compiled module \"%s\": %s"),
701 filename.get (), bfd_errmsg (bfd_get_error ()));
702
703 missing_symbols = 0;
704 for (symp = symbol_table; symp < symbol_table + number_of_symbols; symp++)
705 {
706 asymbol *sym = *symp;
707
708 if (sym->flags != 0)
709 continue;
710 sym->flags = BSF_GLOBAL;
711 sym->section = bfd_abs_section_ptr;
712 if (strcmp (sym->name, "_GLOBAL_OFFSET_TABLE_") == 0)
713 {
714 if (compile_debug)
715 fprintf_unfiltered (gdb_stdlog,
716 "ELF symbol \"%s\" relocated to zero\n",
717 sym->name);
718
719 /* It seems to be a GCC bug, with -mcmodel=large there should be no
720 need for _GLOBAL_OFFSET_TABLE_. Together with -fPIE the data
721 remain PC-relative even with _GLOBAL_OFFSET_TABLE_ as zero. */
722 sym->value = 0;
723 continue;
724 }
725 bmsym = lookup_minimal_symbol (sym->name, NULL, NULL);
726 switch (bmsym.minsym == NULL
727 ? mst_unknown : MSYMBOL_TYPE (bmsym.minsym))
728 {
729 case mst_text:
730 case mst_bss:
731 case mst_data:
732 sym->value = BMSYMBOL_VALUE_ADDRESS (bmsym);
733 if (compile_debug)
734 fprintf_unfiltered (gdb_stdlog,
735 "ELF mst_text symbol \"%s\" relocated to %s\n",
736 sym->name,
737 paddress (target_gdbarch (), sym->value));
738 break;
739 case mst_text_gnu_ifunc:
740 sym->value = gnu_ifunc_resolve_addr (target_gdbarch (),
741 BMSYMBOL_VALUE_ADDRESS (bmsym));
742 if (compile_debug)
743 fprintf_unfiltered (gdb_stdlog,
744 "ELF mst_text_gnu_ifunc symbol \"%s\" "
745 "relocated to %s\n",
746 sym->name,
747 paddress (target_gdbarch (), sym->value));
748 break;
749 default:
750 warning (_("Could not find symbol \"%s\" "
751 "for compiled module \"%s\"."),
752 sym->name, filename.get ());
753 missing_symbols++;
754 }
755 }
756 if (missing_symbols)
757 error (_("%ld symbols were missing, cannot continue."), missing_symbols);
758
759 bfd_map_over_sections (abfd.get (), copy_sections, symbol_table);
760
761 regs_type = get_regs_type (func_sym, objfile);
762 if (regs_type == NULL)
763 regs_addr = 0;
764 else
765 {
766 /* Use read-only non-executable memory protection. */
767 regs_addr = gdbarch_infcall_mmap (target_gdbarch (),
768 TYPE_LENGTH (regs_type),
769 GDB_MMAP_PROT_READ);
770 gdb_assert (regs_addr != 0);
771 setup_sections_data.munmap_list.add (regs_addr, TYPE_LENGTH (regs_type));
772 if (compile_debug)
773 fprintf_unfiltered (gdb_stdlog,
774 "allocated %s bytes at %s for registers\n",
775 paddress (target_gdbarch (),
776 TYPE_LENGTH (regs_type)),
777 paddress (target_gdbarch (), regs_addr));
778 store_regs (regs_type, regs_addr);
779 }
780
781 if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE
782 || scope == COMPILE_I_PRINT_VALUE_SCOPE)
783 {
784 out_value_type = get_out_value_type (func_sym, objfile, scope);
785 if (out_value_type == NULL)
786 return NULL;
787 check_typedef (out_value_type);
788 out_value_addr = gdbarch_infcall_mmap (target_gdbarch (),
789 TYPE_LENGTH (out_value_type),
790 (GDB_MMAP_PROT_READ
791 | GDB_MMAP_PROT_WRITE));
792 gdb_assert (out_value_addr != 0);
793 setup_sections_data.munmap_list.add (out_value_addr,
794 TYPE_LENGTH (out_value_type));
795 if (compile_debug)
796 fprintf_unfiltered (gdb_stdlog,
797 "allocated %s bytes at %s for printed value\n",
798 paddress (target_gdbarch (),
799 TYPE_LENGTH (out_value_type)),
800 paddress (target_gdbarch (), out_value_addr));
801 }
802
803 compile_module_up retval (new struct compile_module);
804 retval->objfile = objfile_holder.release ();
805 retval->source_file = file_names.source_file ();
806 retval->func_sym = func_sym;
807 retval->regs_addr = regs_addr;
808 retval->scope = scope;
809 retval->scope_data = scope_data;
810 retval->out_value_type = out_value_type;
811 retval->out_value_addr = out_value_addr;
812 retval->munmap_list = std::move (setup_sections_data.munmap_list);
813
814 return retval;
815 }
816