| 1 | /* Load module for 'compile' command. |
| 2 | |
| 3 | Copyright (C) 2014-2019 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 |
| 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 | |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 | { |
| 294 | explicit link_hash_table_cleanup_data (bfd *abfd_) |
| 295 | : abfd (abfd_), |
| 296 | link_next (abfd->link.next) |
| 297 | { |
| 298 | } |
| 299 | |
| 300 | ~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 |
| 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 * |
| 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 | bv = SYMTAB_BLOCKVECTOR (func_sym->owner.symtab); |
| 406 | nblocks = BLOCKVECTOR_NBLOCKS (bv); |
| 407 | |
| 408 | gdb_ptr_type_sym = NULL; |
| 409 | for (block_loop = 0; block_loop < nblocks; block_loop++) |
| 410 | { |
| 411 | struct symbol *function = NULL; |
| 412 | const struct block *function_block; |
| 413 | |
| 414 | block = BLOCKVECTOR_BLOCK (bv, block_loop); |
| 415 | if (BLOCK_FUNCTION (block) != NULL) |
| 416 | continue; |
| 417 | gdb_val_sym = block_lookup_symbol (block, |
| 418 | COMPILE_I_EXPR_VAL, |
| 419 | symbol_name_match_type::SEARCH_NAME, |
| 420 | VAR_DOMAIN); |
| 421 | if (gdb_val_sym == NULL) |
| 422 | continue; |
| 423 | |
| 424 | function_block = block; |
| 425 | while (function_block != BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) |
| 426 | && function_block != BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK)) |
| 427 | { |
| 428 | function_block = BLOCK_SUPERBLOCK (function_block); |
| 429 | function = BLOCK_FUNCTION (function_block); |
| 430 | if (function != NULL) |
| 431 | break; |
| 432 | } |
| 433 | if (function != NULL |
| 434 | && (BLOCK_SUPERBLOCK (function_block) |
| 435 | == BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)) |
| 436 | && (strcmp_iw (SYMBOL_LINKAGE_NAME (function), |
| 437 | GCC_FE_WRAPPER_FUNCTION) |
| 438 | == 0)) |
| 439 | break; |
| 440 | } |
| 441 | if (block_loop == nblocks) |
| 442 | error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_PTR_TYPE); |
| 443 | |
| 444 | gdb_type = SYMBOL_TYPE (gdb_val_sym); |
| 445 | gdb_type = check_typedef (gdb_type); |
| 446 | |
| 447 | gdb_ptr_type_sym = block_lookup_symbol (block, COMPILE_I_EXPR_PTR_TYPE, |
| 448 | symbol_name_match_type::SEARCH_NAME, |
| 449 | VAR_DOMAIN); |
| 450 | if (gdb_ptr_type_sym == NULL) |
| 451 | error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_PTR_TYPE); |
| 452 | gdb_ptr_type = SYMBOL_TYPE (gdb_ptr_type_sym); |
| 453 | gdb_ptr_type = check_typedef (gdb_ptr_type); |
| 454 | if (TYPE_CODE (gdb_ptr_type) != TYPE_CODE_PTR) |
| 455 | error (_("Type of \"%s\" is not a pointer"), COMPILE_I_EXPR_PTR_TYPE); |
| 456 | gdb_type_from_ptr = check_typedef (TYPE_TARGET_TYPE (gdb_ptr_type)); |
| 457 | |
| 458 | if (types_deeply_equal (gdb_type, gdb_type_from_ptr)) |
| 459 | { |
| 460 | if (scope != COMPILE_I_PRINT_ADDRESS_SCOPE) |
| 461 | error (_("Expected address scope in compiled module \"%s\"."), |
| 462 | objfile_name (objfile)); |
| 463 | return gdb_type; |
| 464 | } |
| 465 | |
| 466 | if (TYPE_CODE (gdb_type) != TYPE_CODE_PTR) |
| 467 | error (_("Invalid type code %d of symbol \"%s\" " |
| 468 | "in compiled module \"%s\"."), |
| 469 | TYPE_CODE (gdb_type_from_ptr), COMPILE_I_EXPR_VAL, |
| 470 | objfile_name (objfile)); |
| 471 | |
| 472 | retval = gdb_type_from_ptr; |
| 473 | switch (TYPE_CODE (gdb_type_from_ptr)) |
| 474 | { |
| 475 | case TYPE_CODE_ARRAY: |
| 476 | gdb_type_from_ptr = TYPE_TARGET_TYPE (gdb_type_from_ptr); |
| 477 | break; |
| 478 | case TYPE_CODE_FUNC: |
| 479 | break; |
| 480 | default: |
| 481 | error (_("Invalid type code %d of symbol \"%s\" " |
| 482 | "in compiled module \"%s\"."), |
| 483 | TYPE_CODE (gdb_type_from_ptr), COMPILE_I_EXPR_PTR_TYPE, |
| 484 | objfile_name (objfile)); |
| 485 | } |
| 486 | if (!types_deeply_equal (gdb_type_from_ptr, |
| 487 | TYPE_TARGET_TYPE (gdb_type))) |
| 488 | error (_("Referenced types do not match for symbols \"%s\" and \"%s\" " |
| 489 | "in compiled module \"%s\"."), |
| 490 | COMPILE_I_EXPR_PTR_TYPE, COMPILE_I_EXPR_VAL, |
| 491 | objfile_name (objfile)); |
| 492 | if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE) |
| 493 | return NULL; |
| 494 | return retval; |
| 495 | } |
| 496 | |
| 497 | /* Fetch the type of first parameter of FUNC_SYM. |
| 498 | Return NULL if FUNC_SYM has no parameters. Throw an error otherwise. */ |
| 499 | |
| 500 | static struct type * |
| 501 | get_regs_type (struct symbol *func_sym, struct objfile *objfile) |
| 502 | { |
| 503 | struct type *func_type = SYMBOL_TYPE (func_sym); |
| 504 | struct type *regsp_type, *regs_type; |
| 505 | |
| 506 | /* No register parameter present. */ |
| 507 | if (TYPE_NFIELDS (func_type) == 0) |
| 508 | return NULL; |
| 509 | |
| 510 | regsp_type = check_typedef (TYPE_FIELD_TYPE (func_type, 0)); |
| 511 | if (TYPE_CODE (regsp_type) != TYPE_CODE_PTR) |
| 512 | error (_("Invalid type code %d of first parameter of function \"%s\" " |
| 513 | "in compiled module \"%s\"."), |
| 514 | TYPE_CODE (regsp_type), GCC_FE_WRAPPER_FUNCTION, |
| 515 | objfile_name (objfile)); |
| 516 | |
| 517 | regs_type = check_typedef (TYPE_TARGET_TYPE (regsp_type)); |
| 518 | if (TYPE_CODE (regs_type) != TYPE_CODE_STRUCT) |
| 519 | error (_("Invalid type code %d of dereferenced first parameter " |
| 520 | "of function \"%s\" in compiled module \"%s\"."), |
| 521 | TYPE_CODE (regs_type), GCC_FE_WRAPPER_FUNCTION, |
| 522 | objfile_name (objfile)); |
| 523 | |
| 524 | return regs_type; |
| 525 | } |
| 526 | |
| 527 | /* Store all inferior registers required by REGS_TYPE to inferior memory |
| 528 | starting at inferior address REGS_BASE. */ |
| 529 | |
| 530 | static void |
| 531 | store_regs (struct type *regs_type, CORE_ADDR regs_base) |
| 532 | { |
| 533 | struct gdbarch *gdbarch = target_gdbarch (); |
| 534 | int fieldno; |
| 535 | |
| 536 | for (fieldno = 0; fieldno < TYPE_NFIELDS (regs_type); fieldno++) |
| 537 | { |
| 538 | const char *reg_name = TYPE_FIELD_NAME (regs_type, fieldno); |
| 539 | ULONGEST reg_bitpos = TYPE_FIELD_BITPOS (regs_type, fieldno); |
| 540 | ULONGEST reg_bitsize = TYPE_FIELD_BITSIZE (regs_type, fieldno); |
| 541 | ULONGEST reg_offset; |
| 542 | struct type *reg_type = check_typedef (TYPE_FIELD_TYPE (regs_type, |
| 543 | fieldno)); |
| 544 | ULONGEST reg_size = TYPE_LENGTH (reg_type); |
| 545 | int regnum; |
| 546 | struct value *regval; |
| 547 | CORE_ADDR inferior_addr; |
| 548 | |
| 549 | if (strcmp (reg_name, COMPILE_I_SIMPLE_REGISTER_DUMMY) == 0) |
| 550 | continue; |
| 551 | |
| 552 | if ((reg_bitpos % 8) != 0 || reg_bitsize != 0) |
| 553 | error (_("Invalid register \"%s\" position %s bits or size %s bits"), |
| 554 | reg_name, pulongest (reg_bitpos), pulongest (reg_bitsize)); |
| 555 | reg_offset = reg_bitpos / 8; |
| 556 | |
| 557 | if (TYPE_CODE (reg_type) != TYPE_CODE_INT |
| 558 | && TYPE_CODE (reg_type) != TYPE_CODE_PTR) |
| 559 | error (_("Invalid register \"%s\" type code %d"), reg_name, |
| 560 | TYPE_CODE (reg_type)); |
| 561 | |
| 562 | regnum = compile_register_name_demangle (gdbarch, reg_name); |
| 563 | |
| 564 | regval = value_from_register (reg_type, regnum, get_current_frame ()); |
| 565 | if (value_optimized_out (regval)) |
| 566 | error (_("Register \"%s\" is optimized out."), reg_name); |
| 567 | if (!value_entirely_available (regval)) |
| 568 | error (_("Register \"%s\" is not available."), reg_name); |
| 569 | |
| 570 | inferior_addr = regs_base + reg_offset; |
| 571 | if (0 != target_write_memory (inferior_addr, value_contents (regval), |
| 572 | reg_size)) |
| 573 | error (_("Cannot write register \"%s\" to inferior memory at %s."), |
| 574 | reg_name, paddress (gdbarch, inferior_addr)); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | /* Load the object file specified in FILE_NAMES into inferior memory. |
| 579 | Throw an error otherwise. Caller must fully dispose the return |
| 580 | value by calling compile_object_run. Returns NULL only for |
| 581 | COMPILE_I_PRINT_ADDRESS_SCOPE when COMPILE_I_PRINT_VALUE_SCOPE |
| 582 | should have been used instead. */ |
| 583 | |
| 584 | struct compile_module * |
| 585 | compile_object_load (const compile_file_names &file_names, |
| 586 | enum compile_i_scope_types scope, void *scope_data) |
| 587 | { |
| 588 | struct setup_sections_data setup_sections_data; |
| 589 | CORE_ADDR regs_addr, out_value_addr = 0; |
| 590 | struct symbol *func_sym; |
| 591 | struct type *func_type; |
| 592 | struct bound_minimal_symbol bmsym; |
| 593 | long storage_needed; |
| 594 | asymbol **symbol_table, **symp; |
| 595 | long number_of_symbols, missing_symbols; |
| 596 | struct compile_module *retval; |
| 597 | struct type *regs_type, *out_value_type = NULL; |
| 598 | char **matching; |
| 599 | struct objfile *objfile; |
| 600 | int expect_parameters; |
| 601 | struct type *expect_return_type; |
| 602 | |
| 603 | gdb::unique_xmalloc_ptr<char> filename |
| 604 | (tilde_expand (file_names.object_file ())); |
| 605 | |
| 606 | gdb_bfd_ref_ptr abfd (gdb_bfd_open (filename.get (), gnutarget, -1)); |
| 607 | if (abfd == NULL) |
| 608 | error (_("\"%s\": could not open as compiled module: %s"), |
| 609 | filename.get (), bfd_errmsg (bfd_get_error ())); |
| 610 | |
| 611 | if (!bfd_check_format_matches (abfd.get (), bfd_object, &matching)) |
| 612 | error (_("\"%s\": not in loadable format: %s"), |
| 613 | filename.get (), |
| 614 | gdb_bfd_errmsg (bfd_get_error (), matching).c_str ()); |
| 615 | |
| 616 | if ((bfd_get_file_flags (abfd.get ()) & (EXEC_P | DYNAMIC)) != 0) |
| 617 | error (_("\"%s\": not in object format."), filename.get ()); |
| 618 | |
| 619 | setup_sections_data.last_size = 0; |
| 620 | setup_sections_data.last_section_first = abfd->sections; |
| 621 | setup_sections_data.last_prot = -1; |
| 622 | setup_sections_data.last_max_alignment = 1; |
| 623 | setup_sections_data.munmap_list.reset (new struct munmap_list); |
| 624 | |
| 625 | bfd_map_over_sections (abfd.get (), setup_sections, &setup_sections_data); |
| 626 | setup_sections (abfd.get (), NULL, &setup_sections_data); |
| 627 | |
| 628 | storage_needed = bfd_get_symtab_upper_bound (abfd.get ()); |
| 629 | if (storage_needed < 0) |
| 630 | error (_("Cannot read symbols of compiled module \"%s\": %s"), |
| 631 | filename.get (), bfd_errmsg (bfd_get_error ())); |
| 632 | |
| 633 | /* SYMFILE_VERBOSE is not passed even if FROM_TTY, user is not interested in |
| 634 | "Reading symbols from ..." message for automatically generated file. */ |
| 635 | std::unique_ptr<struct objfile> objfile_holder |
| 636 | (symbol_file_add_from_bfd (abfd.get (), filename.get (), |
| 637 | 0, NULL, 0, NULL)); |
| 638 | objfile = objfile_holder.get (); |
| 639 | |
| 640 | func_sym = lookup_global_symbol_from_objfile (objfile, |
| 641 | GLOBAL_BLOCK, |
| 642 | GCC_FE_WRAPPER_FUNCTION, |
| 643 | VAR_DOMAIN).symbol; |
| 644 | if (func_sym == NULL) |
| 645 | error (_("Cannot find function \"%s\" in compiled module \"%s\"."), |
| 646 | GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile)); |
| 647 | func_type = SYMBOL_TYPE (func_sym); |
| 648 | if (TYPE_CODE (func_type) != TYPE_CODE_FUNC) |
| 649 | error (_("Invalid type code %d of function \"%s\" in compiled " |
| 650 | "module \"%s\"."), |
| 651 | TYPE_CODE (func_type), GCC_FE_WRAPPER_FUNCTION, |
| 652 | objfile_name (objfile)); |
| 653 | |
| 654 | switch (scope) |
| 655 | { |
| 656 | case COMPILE_I_SIMPLE_SCOPE: |
| 657 | expect_parameters = 1; |
| 658 | expect_return_type = builtin_type (target_gdbarch ())->builtin_void; |
| 659 | break; |
| 660 | case COMPILE_I_RAW_SCOPE: |
| 661 | expect_parameters = 0; |
| 662 | expect_return_type = builtin_type (target_gdbarch ())->builtin_void; |
| 663 | break; |
| 664 | case COMPILE_I_PRINT_ADDRESS_SCOPE: |
| 665 | case COMPILE_I_PRINT_VALUE_SCOPE: |
| 666 | expect_parameters = 2; |
| 667 | expect_return_type = builtin_type (target_gdbarch ())->builtin_void; |
| 668 | break; |
| 669 | default: |
| 670 | internal_error (__FILE__, __LINE__, _("invalid scope %d"), scope); |
| 671 | } |
| 672 | if (TYPE_NFIELDS (func_type) != expect_parameters) |
| 673 | error (_("Invalid %d parameters of function \"%s\" in compiled " |
| 674 | "module \"%s\"."), |
| 675 | TYPE_NFIELDS (func_type), GCC_FE_WRAPPER_FUNCTION, |
| 676 | objfile_name (objfile)); |
| 677 | if (!types_deeply_equal (expect_return_type, TYPE_TARGET_TYPE (func_type))) |
| 678 | error (_("Invalid return type of function \"%s\" in compiled " |
| 679 | "module \"%s\"."), |
| 680 | GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile)); |
| 681 | |
| 682 | /* The memory may be later needed |
| 683 | by bfd_generic_get_relocated_section_contents |
| 684 | called from default_symfile_relocate. */ |
| 685 | symbol_table = (asymbol **) obstack_alloc (&objfile->objfile_obstack, |
| 686 | storage_needed); |
| 687 | number_of_symbols = bfd_canonicalize_symtab (abfd.get (), symbol_table); |
| 688 | if (number_of_symbols < 0) |
| 689 | error (_("Cannot parse symbols of compiled module \"%s\": %s"), |
| 690 | filename.get (), bfd_errmsg (bfd_get_error ())); |
| 691 | |
| 692 | missing_symbols = 0; |
| 693 | for (symp = symbol_table; symp < symbol_table + number_of_symbols; symp++) |
| 694 | { |
| 695 | asymbol *sym = *symp; |
| 696 | |
| 697 | if (sym->flags != 0) |
| 698 | continue; |
| 699 | sym->flags = BSF_GLOBAL; |
| 700 | sym->section = bfd_abs_section_ptr; |
| 701 | if (strcmp (sym->name, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 702 | { |
| 703 | if (compile_debug) |
| 704 | fprintf_unfiltered (gdb_stdlog, |
| 705 | "ELF symbol \"%s\" relocated to zero\n", |
| 706 | sym->name); |
| 707 | |
| 708 | /* It seems to be a GCC bug, with -mcmodel=large there should be no |
| 709 | need for _GLOBAL_OFFSET_TABLE_. Together with -fPIE the data |
| 710 | remain PC-relative even with _GLOBAL_OFFSET_TABLE_ as zero. */ |
| 711 | sym->value = 0; |
| 712 | continue; |
| 713 | } |
| 714 | bmsym = lookup_minimal_symbol (sym->name, NULL, NULL); |
| 715 | switch (bmsym.minsym == NULL |
| 716 | ? mst_unknown : MSYMBOL_TYPE (bmsym.minsym)) |
| 717 | { |
| 718 | case mst_text: |
| 719 | case mst_bss: |
| 720 | case mst_data: |
| 721 | sym->value = BMSYMBOL_VALUE_ADDRESS (bmsym); |
| 722 | if (compile_debug) |
| 723 | fprintf_unfiltered (gdb_stdlog, |
| 724 | "ELF mst_text symbol \"%s\" relocated to %s\n", |
| 725 | sym->name, |
| 726 | paddress (target_gdbarch (), sym->value)); |
| 727 | break; |
| 728 | case mst_text_gnu_ifunc: |
| 729 | sym->value = gnu_ifunc_resolve_addr (target_gdbarch (), |
| 730 | BMSYMBOL_VALUE_ADDRESS (bmsym)); |
| 731 | if (compile_debug) |
| 732 | fprintf_unfiltered (gdb_stdlog, |
| 733 | "ELF mst_text_gnu_ifunc symbol \"%s\" " |
| 734 | "relocated to %s\n", |
| 735 | sym->name, |
| 736 | paddress (target_gdbarch (), sym->value)); |
| 737 | break; |
| 738 | default: |
| 739 | warning (_("Could not find symbol \"%s\" " |
| 740 | "for compiled module \"%s\"."), |
| 741 | sym->name, filename.get ()); |
| 742 | missing_symbols++; |
| 743 | } |
| 744 | } |
| 745 | if (missing_symbols) |
| 746 | error (_("%ld symbols were missing, cannot continue."), missing_symbols); |
| 747 | |
| 748 | bfd_map_over_sections (abfd.get (), copy_sections, symbol_table); |
| 749 | |
| 750 | regs_type = get_regs_type (func_sym, objfile); |
| 751 | if (regs_type == NULL) |
| 752 | regs_addr = 0; |
| 753 | else |
| 754 | { |
| 755 | /* Use read-only non-executable memory protection. */ |
| 756 | regs_addr = gdbarch_infcall_mmap (target_gdbarch (), |
| 757 | TYPE_LENGTH (regs_type), |
| 758 | GDB_MMAP_PROT_READ); |
| 759 | gdb_assert (regs_addr != 0); |
| 760 | setup_sections_data.munmap_list->add (regs_addr, TYPE_LENGTH (regs_type)); |
| 761 | if (compile_debug) |
| 762 | fprintf_unfiltered (gdb_stdlog, |
| 763 | "allocated %s bytes at %s for registers\n", |
| 764 | paddress (target_gdbarch (), |
| 765 | TYPE_LENGTH (regs_type)), |
| 766 | paddress (target_gdbarch (), regs_addr)); |
| 767 | store_regs (regs_type, regs_addr); |
| 768 | } |
| 769 | |
| 770 | if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE |
| 771 | || scope == COMPILE_I_PRINT_VALUE_SCOPE) |
| 772 | { |
| 773 | out_value_type = get_out_value_type (func_sym, objfile, scope); |
| 774 | if (out_value_type == NULL) |
| 775 | return NULL; |
| 776 | check_typedef (out_value_type); |
| 777 | out_value_addr = gdbarch_infcall_mmap (target_gdbarch (), |
| 778 | TYPE_LENGTH (out_value_type), |
| 779 | (GDB_MMAP_PROT_READ |
| 780 | | GDB_MMAP_PROT_WRITE)); |
| 781 | gdb_assert (out_value_addr != 0); |
| 782 | setup_sections_data.munmap_list->add (out_value_addr, |
| 783 | TYPE_LENGTH (out_value_type)); |
| 784 | if (compile_debug) |
| 785 | fprintf_unfiltered (gdb_stdlog, |
| 786 | "allocated %s bytes at %s for printed value\n", |
| 787 | paddress (target_gdbarch (), |
| 788 | TYPE_LENGTH (out_value_type)), |
| 789 | paddress (target_gdbarch (), out_value_addr)); |
| 790 | } |
| 791 | |
| 792 | retval = XNEW (struct compile_module); |
| 793 | retval->objfile = objfile_holder.release (); |
| 794 | retval->source_file = xstrdup (file_names.source_file ()); |
| 795 | retval->func_sym = func_sym; |
| 796 | retval->regs_addr = regs_addr; |
| 797 | retval->scope = scope; |
| 798 | retval->scope_data = scope_data; |
| 799 | retval->out_value_type = out_value_type; |
| 800 | retval->out_value_addr = out_value_addr; |
| 801 | retval->munmap_list_head = setup_sections_data.munmap_list.release (); |
| 802 | |
| 803 | return retval; |
| 804 | } |