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compile-object-load.c
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1/* Load module for 'compile' command.
2
3 Copyright (C) 2014-2023 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
40void
41munmap_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
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
69{
70 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. */
83
84private:
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. */
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
106void
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)
130 "module \"%s\" section \"%s\" size %s prot %u\n",
131 bfd_get_filename (m_bfd),
132 bfd_section_name (sect),
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 {
151 if (compile_debug)
153 "allocated %s bytes at %s prot %u\n",
155 paddress (target_gdbarch (), addr),
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),
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;
174 m_last_prot = prot;
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
194static void
195link_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
209static void
210link_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
221static void
222link_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
233static void
234link_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
244static void
245link_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
257static void
258link_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
270static void link_callbacks_einfo (const char *fmt, ...)
271 ATTRIBUTE_PRINTF (1, 2);
272
273static void
274link_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
289static 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
309{
310 explicit link_hash_table_cleanup_data (bfd *abfd_)
311 : abfd (abfd_),
312 link_next (abfd->link.next)
313 {
314 }
315
317 {
318 if (abfd->is_linker_output)
319 (*abfd->link.hash->hash_table_free) (abfd);
320 abfd->link.next = link_next;
321 }
322
324
325private:
326
327 bfd *abfd;
329};
330
331/* Relocate and store into inferior memory each section SECT of ABFD. */
332
333static void
334copy_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),
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
407static struct type *
408get_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,
423
424 bv = func_sym->symtab ()->compunit ()->blockvector ();
425 nblocks = bv->num_blocks ();
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 = bv->block (block_loop);
434 if (block->function () != NULL)
435 continue;
436 gdb_val_sym = block_lookup_symbol (block,
439 VAR_DOMAIN);
440 if (gdb_val_sym == NULL)
441 continue;
442
444 while (function_block != bv->static_block ()
445 && function_block != bv->global_block ())
446 {
449 if (function != NULL)
450 break;
451 }
452 if (function != NULL
453 && function_block->superblock () == bv->static_block ()
454 && symbol_matches_search_name (function, func_matcher))
455 break;
456 }
457 if (block_loop == nblocks)
458 error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_VAL);
459
460 gdb_type = gdb_val_sym->type ();
461 gdb_type = check_typedef (gdb_type);
462
465 VAR_DOMAIN);
466 if (gdb_ptr_type_sym == NULL)
467 error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_PTR_TYPE);
468 gdb_ptr_type = gdb_ptr_type_sym->type ();
469 gdb_ptr_type = check_typedef (gdb_ptr_type);
470 if (gdb_ptr_type->code () != TYPE_CODE_PTR)
471 error (_("Type of \"%s\" is not a pointer"), COMPILE_I_EXPR_PTR_TYPE);
472 gdb_type_from_ptr = check_typedef (gdb_ptr_type->target_type ());
473
474 if (types_deeply_equal (gdb_type, gdb_type_from_ptr))
475 {
477 error (_("Expected address scope in compiled module \"%s\"."),
479 return gdb_type;
480 }
481
482 if (gdb_type->code () != TYPE_CODE_PTR)
483 error (_("Invalid type code %d of symbol \"%s\" "
484 "in compiled module \"%s\"."),
485 gdb_type_from_ptr->code (), COMPILE_I_EXPR_VAL,
487
488 retval = gdb_type_from_ptr;
489 switch (gdb_type_from_ptr->code ())
490 {
491 case TYPE_CODE_ARRAY:
492 gdb_type_from_ptr = gdb_type_from_ptr->target_type ();
493 break;
494 case TYPE_CODE_FUNC:
495 break;
496 default:
497 error (_("Invalid type code %d of symbol \"%s\" "
498 "in compiled module \"%s\"."),
499 gdb_type_from_ptr->code (), COMPILE_I_EXPR_PTR_TYPE,
501 }
502 if (!types_deeply_equal (gdb_type_from_ptr,
503 gdb_type->target_type ()))
504 error (_("Referenced types do not match for symbols \"%s\" and \"%s\" "
505 "in compiled module \"%s\"."),
509 return NULL;
510 return retval;
511}
512
513/* Fetch the type of first parameter of FUNC_SYM.
514 Return NULL if FUNC_SYM has no parameters. Throw an error otherwise. */
515
516static struct type *
517get_regs_type (struct symbol *func_sym, struct objfile *objfile)
518{
519 struct type *func_type = func_sym->type ();
520 struct type *regsp_type, *regs_type;
521
522 /* No register parameter present. */
523 if (func_type->num_fields () == 0)
524 return NULL;
525
526 regsp_type = check_typedef (func_type->field (0).type ());
527 if (regsp_type->code () != TYPE_CODE_PTR)
528 error (_("Invalid type code %d of first parameter of function \"%s\" "
529 "in compiled module \"%s\"."),
530 regsp_type->code (), GCC_FE_WRAPPER_FUNCTION,
532
533 regs_type = check_typedef (regsp_type->target_type ());
534 if (regs_type->code () != TYPE_CODE_STRUCT)
535 error (_("Invalid type code %d of dereferenced first parameter "
536 "of function \"%s\" in compiled module \"%s\"."),
537 regs_type->code (), GCC_FE_WRAPPER_FUNCTION,
539
540 return regs_type;
541}
542
543/* Store all inferior registers required by REGS_TYPE to inferior memory
544 starting at inferior address REGS_BASE. */
545
546static void
547store_regs (struct type *regs_type, CORE_ADDR regs_base)
548{
549 struct gdbarch *gdbarch = target_gdbarch ();
550 int fieldno;
551
552 for (fieldno = 0; fieldno < regs_type->num_fields (); fieldno++)
553 {
554 const char *reg_name = regs_type->field (fieldno).name ();
555 ULONGEST reg_bitpos = regs_type->field (fieldno).loc_bitpos ();
556 ULONGEST reg_bitsize = regs_type->field (fieldno).bitsize ();
557 ULONGEST reg_offset;
558 struct type *reg_type
559 = check_typedef (regs_type->field (fieldno).type ());
560 ULONGEST reg_size = reg_type->length ();
561 int regnum;
562 struct value *regval;
563 CORE_ADDR inferior_addr;
564
565 if (strcmp (reg_name, COMPILE_I_SIMPLE_REGISTER_DUMMY) == 0)
566 continue;
567
568 if ((reg_bitpos % 8) != 0 || reg_bitsize != 0)
569 error (_("Invalid register \"%s\" position %s bits or size %s bits"),
570 reg_name, pulongest (reg_bitpos), pulongest (reg_bitsize));
571 reg_offset = reg_bitpos / 8;
572
573 if (reg_type->code () != TYPE_CODE_INT
574 && reg_type->code () != TYPE_CODE_PTR)
575 error (_("Invalid register \"%s\" type code %d"), reg_name,
576 reg_type->code ());
577
579
580 regval = value_from_register (reg_type, regnum, get_current_frame ());
581 if (regval->optimized_out ())
582 error (_("Register \"%s\" is optimized out."), reg_name);
583 if (!regval->entirely_available ())
584 error (_("Register \"%s\" is not available."), reg_name);
585
586 inferior_addr = regs_base + reg_offset;
587 if (0 != target_write_memory (inferior_addr,
588 regval->contents ().data (),
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
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
635 for (asection *sect = abfd->sections; sect != nullptr; sect = sect->next)
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,
647 filename.get (),
648 0, NULL, 0, NULL));
649 objfile = objfile_holder.get ();
650
653 GCC_FE_WRAPPER_FUNCTION,
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 = func_sym->type ();
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,
664
665 switch (scope)
666 {
668 expect_parameters = 1;
669 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
670 break;
672 expect_parameters = 0;
673 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
674 break;
677 expect_parameters = 2;
678 expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
679 break;
680 default:
681 internal_error (_("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,
688 if (!types_deeply_equal (expect_return_type, func_type->target_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)
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 if (strcmp (sym->name, ".TOC.") == 0)
726 {
727 /* Handle the .TOC. symbol as the linker would do. Set the .TOC.
728 sections value to 0x8000 (see bfd/elf64-ppc.c TOC_BASE_OFF);
729 point the symbol section at the ".toc" section;
730 and pass the toc->vma value into bfd_set_gp_value().
731 If the .toc section is not found, use the first section
732 with the SEC_ALLOC flag set. In the unlikely case that
733 we still do not have a section identified, fall back to using
734 the "*ABS*" section. */
735 asection *toc_fallback = bfd_get_section_by_name(abfd.get(), ".toc");
736 if (toc_fallback == NULL)
737 {
738 for (asection *tsect = abfd->sections; tsect != nullptr;
739 tsect = tsect->next)
740 {
741 if (bfd_section_flags (tsect) & SEC_ALLOC)
742 {
743 toc_fallback = tsect;
744 break;
745 }
746 }
747 }
748
749 if (toc_fallback == NULL)
750 /* If we've gotten here, we have not found a section usable
751 as a backup for the .toc section. In this case, use the
752 absolute (*ABS*) section. */
753 toc_fallback = bfd_abs_section_ptr;
754
755 sym->section = toc_fallback;
756 sym->value = 0x8000;
757 bfd_set_gp_value(abfd.get(), toc_fallback->vma);
758 if (compile_debug)
760 "Connecting ELF symbol \"%s\" to the .toc section (%s)\n",
761 sym->name,
762 paddress (target_gdbarch (), sym->value));
763 continue;
764 }
765
766 bmsym = lookup_minimal_symbol (sym->name, NULL, NULL);
767 switch (bmsym.minsym == NULL
768 ? mst_unknown : bmsym.minsym->type ())
769 {
770 case mst_text:
771 case mst_bss:
772 case mst_data:
773 sym->value = bmsym.value_address ();
774 if (compile_debug)
776 "ELF mst_text symbol \"%s\" relocated to %s\n",
777 sym->name,
778 paddress (target_gdbarch (), sym->value));
779 break;
781 sym->value = gnu_ifunc_resolve_addr (target_gdbarch (),
782 bmsym.value_address ());
783 if (compile_debug)
785 "ELF mst_text_gnu_ifunc symbol \"%s\" "
786 "relocated to %s\n",
787 sym->name,
788 paddress (target_gdbarch (), sym->value));
789 break;
790 default:
791 warning (_("Could not find symbol \"%s\" "
792 "for compiled module \"%s\"."),
793 sym->name, filename.get ());
794 missing_symbols++;
795 }
796 }
797 if (missing_symbols)
798 error (_("%ld symbols were missing, cannot continue."), missing_symbols);
799
800 bfd_map_over_sections (abfd.get (), copy_sections, symbol_table);
801
802 regs_type = get_regs_type (func_sym, objfile);
803 if (regs_type == NULL)
804 regs_addr = 0;
805 else
806 {
807 /* Use read-only non-executable memory protection. */
808 regs_addr = gdbarch_infcall_mmap (target_gdbarch (),
809 regs_type->length (),
811 gdb_assert (regs_addr != 0);
812 setup_sections_data.munmap_list.add (regs_addr, regs_type->length ());
813 if (compile_debug)
815 "allocated %s bytes at %s for registers\n",
817 regs_type->length ()),
818 paddress (target_gdbarch (), regs_addr));
819 store_regs (regs_type, regs_addr);
820 }
821
823 || scope == COMPILE_I_PRINT_VALUE_SCOPE)
824 {
825 out_value_type = get_out_value_type (func_sym, objfile, scope);
826 if (out_value_type == NULL)
827 return NULL;
828 check_typedef (out_value_type);
829 out_value_addr = gdbarch_infcall_mmap (target_gdbarch (),
830 out_value_type->length (),
833 gdb_assert (out_value_addr != 0);
834 setup_sections_data.munmap_list.add (out_value_addr,
835 out_value_type->length ());
836 if (compile_debug)
838 "allocated %s bytes at %s for printed value\n",
840 out_value_type->length ()),
841 paddress (target_gdbarch (), out_value_addr));
842 }
843
844 compile_module_up retval (new struct compile_module);
845 retval->objfile = objfile_holder.release ();
846 retval->source_file = file_names.source_file ();
847 retval->func_sym = func_sym;
848 retval->regs_addr = regs_addr;
849 retval->scope = scope;
850 retval->scope_data = scope_data;
851 retval->out_value_type = out_value_type;
852 retval->out_value_addr = out_value_addr;
853 retval->munmap_list = std::move (setup_sections_data.munmap_list);
854
855 return retval;
856}
constexpr string_view get()
Definition 70483.cc:49
int regnum
const char *const name
void * xmalloc(YYSIZE_T)
struct gdbarch * target_gdbarch(void)
#define GDB_MMAP_PROT_WRITE
Definition arch-utils.h:267
#define GDB_MMAP_PROT_EXEC
Definition arch-utils.h:268
#define GDB_MMAP_PROT_READ
Definition arch-utils.h:266
struct symbol * block_lookup_symbol(const struct block *block, const char *name, symbol_name_match_type match_type, const domain_enum domain)
Definition block.c:676
const char * source_file() const
const char * object_file() const
#define COMPILE_I_SIMPLE_REGISTER_DUMMY
bool compile_debug
Definition compile.c:61
int compile_register_name_demangle(struct gdbarch *gdbarch, const char *reg_name)
Definition compile.c:857
#define COMPILE_I_EXPR_VAL
#define COMPILE_I_EXPR_PTR_TYPE
static void copy_sections(bfd *abfd, asection *sect, void *data)
static void store_regs(struct type *regs_type, CORE_ADDR regs_base)
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)
static void link_callbacks_einfo(const char *fmt,...) ATTRIBUTE_PRINTF(1
static const struct bfd_link_callbacks link_callbacks
static void link_callbacks_reloc_dangerous(struct bfd_link_info *link_info, const char *message, bfd *abfd, asection *section, bfd_vma address)
compile_module_up compile_object_load(const compile_file_names &file_names, enum compile_i_scope_types scope, void *scope_data)
static void link_callbacks_warning(struct bfd_link_info *link_info, const char *xwarning, const char *symbol, bfd *abfd, asection *section, bfd_vma address)
static struct type * get_out_value_type(struct symbol *func_sym, struct objfile *objfile, enum compile_i_scope_types scope)
static void link_callbacks_unattached_reloc(struct bfd_link_info *link_info, const char *name, bfd *abfd, asection *section, bfd_vma address)
static struct type * get_regs_type(struct symbol *func_sym, struct objfile *objfile)
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)
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)
std::unique_ptr< compile_module > compile_module_up
const char * gnutarget
Definition corefile.c:405
compile_i_scope_types
Definition defs.h:70
@ COMPILE_I_PRINT_ADDRESS_SCOPE
Definition defs.h:89
@ COMPILE_I_PRINT_VALUE_SCOPE
Definition defs.h:90
@ COMPILE_I_SIMPLE_SCOPE
Definition defs.h:77
@ COMPILE_I_RAW_SCOPE
Definition defs.h:81
@ GLOBAL_BLOCK
Definition defs.h:585
struct value * value_from_register(struct type *type, int regnum, frame_info_ptr frame)
Definition findvar.c:833
frame_info_ptr get_current_frame(void)
Definition frame.c:1670
static void ATTRIBUTE_PRINTF(1, 0)
Definition gdb_bfd.c:1154
std::string gdb_bfd_errmsg(bfd_error_type error_tag, char **matching)
Definition gdb_bfd.c:1052
gdb_bfd_ref_ptr gdb_bfd_open(const char *name, const char *target, int fd, bool warn_if_slow)
Definition gdb_bfd.c:473
gdb::ref_ptr< struct bfd, gdb_bfd_ref_policy > gdb_bfd_ref_ptr
Definition gdb_bfd.h:79
CORE_ADDR gdbarch_infcall_mmap(struct gdbarch *gdbarch, CORE_ADDR size, unsigned prot)
Definition gdbarch.c:5232
void gdbarch_infcall_munmap(struct gdbarch *gdbarch, CORE_ADDR addr, CORE_ADDR size)
Definition gdbarch.c:5249
const struct builtin_type * builtin_type(struct gdbarch *gdbarch)
Definition gdbtypes.c:6168
bool types_deeply_equal(struct type *type1, struct type *type2)
Definition gdbtypes.c:4342
struct type * check_typedef(struct type *type)
Definition gdbtypes.c:2966
size_t size
Definition go32-nat.c:239
static int reg_offset[]
struct bound_minimal_symbol lookup_minimal_symbol(const char *name, const char *sfile, struct objfile *objf)
Definition minsyms.c:363
const char * objfile_name(const struct objfile *objfile)
Definition objfiles.c:1259
std::unique_ptr< objfile, objfile_deleter > objfile_up
Definition objfiles.h:899
struct symbol * symbol
Definition symtab.h:1533
Definition block.h:109
const block * superblock() const
Definition block.h:135
const struct block * function_block() const
Definition block.c:382
symbol * function() const
Definition block.h:127
const char * scope() const
Definition block.c:287
struct block * block(size_t i)
Definition block.h:374
struct block * static_block()
Definition block.h:405
int num_blocks() const
Definition block.h:393
struct block * global_block()
Definition block.h:397
CORE_ADDR value_address() const
Definition minsyms.h:41
struct minimal_symbol * minsym
Definition minsyms.h:49
struct type * builtin_void
Definition gdbtypes.h:2077
struct blockvector * blockvector()
Definition symtab.h:1847
LONGEST loc_bitpos() const
Definition gdbtypes.h:611
const char * name() const
Definition gdbtypes.h:557
unsigned int bitsize() const
Definition gdbtypes.h:577
struct type * type() const
Definition gdbtypes.h:547
minimal_symbol_type type() const
Definition symtab.h:770
void add(CORE_ADDR addr, CORE_ADDR size)
std::vector< munmap_item > items
objfile(gdb_bfd_ref_ptr, const char *, objfile_flags)
Definition objfiles.c:313
auto_obstack objfile_obstack
Definition objfiles.h:760
struct munmap_list munmap_list
void setup_one_section(asection *sect)
struct type * type() const
Definition symtab.h:1331
struct symtab * symtab
Definition symtab.h:1457
struct compunit_symtab * compunit() const
Definition symtab.h:1677
struct type * target_type() const
Definition gdbtypes.h:1037
type_code code() const
Definition gdbtypes.h:956
ULONGEST length() const
Definition gdbtypes.h:983
struct field & field(int idx) const
Definition gdbtypes.h:1012
unsigned int num_fields() const
Definition gdbtypes.h:994
Definition value.h:130
gdb::array_view< const gdb_byte > contents()
Definition value.c:1262
bool entirely_available()
Definition value.c:209
bool optimized_out()
Definition value.c:1279
struct objfile * symbol_file_add_from_bfd(const gdb_bfd_ref_ptr &abfd, const char *name, symfile_add_flags add_flags, section_addr_info *addrs, objfile_flags flags, struct objfile *parent)
Definition symfile.c:1155
bool symbol_matches_search_name(const struct general_symbol_info *gsymbol, const lookup_name_info &name)
Definition symtab.c:1127
struct block_symbol lookup_global_symbol_from_objfile(struct objfile *main_objfile, enum block_enum block_index, const char *name, const domain_enum domain)
Definition symtab.c:2252
@ mst_bss
Definition symtab.h:695
@ mst_data
Definition symtab.h:694
@ mst_unknown
Definition symtab.h:671
@ mst_text
Definition symtab.h:672
@ mst_text_gnu_ifunc
Definition symtab.h:681
@ VAR_DOMAIN
Definition symtab.h:910
#define gnu_ifunc_resolve_addr
Definition symtab.h:2313
int target_write_memory(CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
Definition target.c:1861
const char * paddress(struct gdbarch *gdbarch, CORE_ADDR addr)
Definition utils.c:3166
void gdb_printf(struct ui_file *stream, const char *format,...)
Definition utils.c:1886
#define gdb_stdlog
Definition utils.h:190