| 1 | /* Handle TIC6X (DSBT) shared libraries for GDB, the GNU Debugger. |
| 2 | Copyright (C) 2010-2019 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "inferior.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "solib.h" |
| 24 | #include "solist.h" |
| 25 | #include "objfiles.h" |
| 26 | #include "symtab.h" |
| 27 | #include "language.h" |
| 28 | #include "command.h" |
| 29 | #include "gdbcmd.h" |
| 30 | #include "elf-bfd.h" |
| 31 | #include "gdb_bfd.h" |
| 32 | |
| 33 | #define GOT_MODULE_OFFSET 4 |
| 34 | |
| 35 | /* Flag which indicates whether internal debug messages should be printed. */ |
| 36 | static unsigned int solib_dsbt_debug = 0; |
| 37 | |
| 38 | /* TIC6X pointers are four bytes wide. */ |
| 39 | enum { TIC6X_PTR_SIZE = 4 }; |
| 40 | |
| 41 | /* Representation of loadmap and related structs for the TIC6X DSBT. */ |
| 42 | |
| 43 | /* External versions; the size and alignment of the fields should be |
| 44 | the same as those on the target. When loaded, the placement of |
| 45 | the bits in each field will be the same as on the target. */ |
| 46 | typedef gdb_byte ext_Elf32_Half[2]; |
| 47 | typedef gdb_byte ext_Elf32_Addr[4]; |
| 48 | typedef gdb_byte ext_Elf32_Word[4]; |
| 49 | |
| 50 | struct ext_elf32_dsbt_loadseg |
| 51 | { |
| 52 | /* Core address to which the segment is mapped. */ |
| 53 | ext_Elf32_Addr addr; |
| 54 | /* VMA recorded in the program header. */ |
| 55 | ext_Elf32_Addr p_vaddr; |
| 56 | /* Size of this segment in memory. */ |
| 57 | ext_Elf32_Word p_memsz; |
| 58 | }; |
| 59 | |
| 60 | struct ext_elf32_dsbt_loadmap { |
| 61 | /* Protocol version number, must be zero. */ |
| 62 | ext_Elf32_Word version; |
| 63 | /* A pointer to the DSBT table; the DSBT size and the index of this |
| 64 | module. */ |
| 65 | ext_Elf32_Word dsbt_table_ptr; |
| 66 | ext_Elf32_Word dsbt_size; |
| 67 | ext_Elf32_Word dsbt_index; |
| 68 | /* Number of segments in this map. */ |
| 69 | ext_Elf32_Word nsegs; |
| 70 | /* The actual memory map. */ |
| 71 | struct ext_elf32_dsbt_loadseg segs[1 /* nsegs, actually */]; |
| 72 | }; |
| 73 | |
| 74 | /* Internal versions; the types are GDB types and the data in each |
| 75 | of the fields is (or will be) decoded from the external struct |
| 76 | for ease of consumption. */ |
| 77 | struct int_elf32_dsbt_loadseg |
| 78 | { |
| 79 | /* Core address to which the segment is mapped. */ |
| 80 | CORE_ADDR addr; |
| 81 | /* VMA recorded in the program header. */ |
| 82 | CORE_ADDR p_vaddr; |
| 83 | /* Size of this segment in memory. */ |
| 84 | long p_memsz; |
| 85 | }; |
| 86 | |
| 87 | struct int_elf32_dsbt_loadmap |
| 88 | { |
| 89 | /* Protocol version number, must be zero. */ |
| 90 | int version; |
| 91 | CORE_ADDR dsbt_table_ptr; |
| 92 | /* A pointer to the DSBT table; the DSBT size and the index of this |
| 93 | module. */ |
| 94 | int dsbt_size, dsbt_index; |
| 95 | /* Number of segments in this map. */ |
| 96 | int nsegs; |
| 97 | /* The actual memory map. */ |
| 98 | struct int_elf32_dsbt_loadseg segs[1 /* nsegs, actually */]; |
| 99 | }; |
| 100 | |
| 101 | /* External link_map and elf32_dsbt_loadaddr struct definitions. */ |
| 102 | |
| 103 | typedef gdb_byte ext_ptr[4]; |
| 104 | |
| 105 | struct ext_elf32_dsbt_loadaddr |
| 106 | { |
| 107 | ext_ptr map; /* struct elf32_dsbt_loadmap *map; */ |
| 108 | }; |
| 109 | |
| 110 | struct ext_link_map |
| 111 | { |
| 112 | struct ext_elf32_dsbt_loadaddr l_addr; |
| 113 | |
| 114 | /* Absolute file name object was found in. */ |
| 115 | ext_ptr l_name; /* char *l_name; */ |
| 116 | |
| 117 | /* Dynamic section of the shared object. */ |
| 118 | ext_ptr l_ld; /* ElfW(Dyn) *l_ld; */ |
| 119 | |
| 120 | /* Chain of loaded objects. */ |
| 121 | ext_ptr l_next, l_prev; /* struct link_map *l_next, *l_prev; */ |
| 122 | }; |
| 123 | |
| 124 | /* Link map info to include in an allocated so_list entry */ |
| 125 | |
| 126 | struct lm_info_dsbt : public lm_info_base |
| 127 | { |
| 128 | ~lm_info_dsbt () |
| 129 | { |
| 130 | xfree (this->map); |
| 131 | } |
| 132 | |
| 133 | /* The loadmap, digested into an easier to use form. */ |
| 134 | int_elf32_dsbt_loadmap *map = NULL; |
| 135 | }; |
| 136 | |
| 137 | /* Per pspace dsbt specific data. */ |
| 138 | |
| 139 | struct dsbt_info |
| 140 | { |
| 141 | /* The load map, got value, etc. are not available from the chain |
| 142 | of loaded shared objects. ``main_executable_lm_info'' provides |
| 143 | a way to get at this information so that it doesn't need to be |
| 144 | frequently recomputed. Initialized by dsbt_relocate_main_executable. */ |
| 145 | struct lm_info_dsbt *main_executable_lm_info; |
| 146 | |
| 147 | /* Load maps for the main executable and the interpreter. These are obtained |
| 148 | from ptrace. They are the starting point for getting into the program, |
| 149 | and are required to find the solib list with the individual load maps for |
| 150 | each module. */ |
| 151 | struct int_elf32_dsbt_loadmap *exec_loadmap; |
| 152 | struct int_elf32_dsbt_loadmap *interp_loadmap; |
| 153 | |
| 154 | /* Cached value for lm_base, below. */ |
| 155 | CORE_ADDR lm_base_cache; |
| 156 | |
| 157 | /* Link map address for main module. */ |
| 158 | CORE_ADDR main_lm_addr; |
| 159 | |
| 160 | CORE_ADDR interp_text_sect_low; |
| 161 | CORE_ADDR interp_text_sect_high; |
| 162 | CORE_ADDR interp_plt_sect_low; |
| 163 | CORE_ADDR interp_plt_sect_high; |
| 164 | }; |
| 165 | |
| 166 | /* Per-program-space data key. */ |
| 167 | static const struct program_space_data *solib_dsbt_pspace_data; |
| 168 | |
| 169 | static void |
| 170 | dsbt_pspace_data_cleanup (struct program_space *pspace, void *arg) |
| 171 | { |
| 172 | xfree (arg); |
| 173 | } |
| 174 | |
| 175 | /* Get the current dsbt data. If none is found yet, add it now. This |
| 176 | function always returns a valid object. */ |
| 177 | |
| 178 | static struct dsbt_info * |
| 179 | get_dsbt_info (void) |
| 180 | { |
| 181 | struct dsbt_info *info; |
| 182 | |
| 183 | info = (struct dsbt_info *) program_space_data (current_program_space, |
| 184 | solib_dsbt_pspace_data); |
| 185 | if (info != NULL) |
| 186 | return info; |
| 187 | |
| 188 | info = XCNEW (struct dsbt_info); |
| 189 | set_program_space_data (current_program_space, solib_dsbt_pspace_data, info); |
| 190 | |
| 191 | info->lm_base_cache = 0; |
| 192 | info->main_lm_addr = 0; |
| 193 | |
| 194 | return info; |
| 195 | } |
| 196 | |
| 197 | |
| 198 | static void |
| 199 | dsbt_print_loadmap (struct int_elf32_dsbt_loadmap *map) |
| 200 | { |
| 201 | int i; |
| 202 | |
| 203 | if (map == NULL) |
| 204 | printf_filtered ("(null)\n"); |
| 205 | else if (map->version != 0) |
| 206 | printf_filtered (_("Unsupported map version: %d\n"), map->version); |
| 207 | else |
| 208 | { |
| 209 | printf_filtered ("version %d\n", map->version); |
| 210 | |
| 211 | for (i = 0; i < map->nsegs; i++) |
| 212 | printf_filtered ("%s:%s -> %s:%s\n", |
| 213 | print_core_address (target_gdbarch (), |
| 214 | map->segs[i].p_vaddr), |
| 215 | print_core_address (target_gdbarch (), |
| 216 | map->segs[i].p_vaddr |
| 217 | + map->segs[i].p_memsz), |
| 218 | print_core_address (target_gdbarch (), map->segs[i].addr), |
| 219 | print_core_address (target_gdbarch (), map->segs[i].addr |
| 220 | + map->segs[i].p_memsz)); |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /* Decode int_elf32_dsbt_loadmap from BUF. */ |
| 225 | |
| 226 | static struct int_elf32_dsbt_loadmap * |
| 227 | decode_loadmap (const gdb_byte *buf) |
| 228 | { |
| 229 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 230 | const struct ext_elf32_dsbt_loadmap *ext_ldmbuf; |
| 231 | struct int_elf32_dsbt_loadmap *int_ldmbuf; |
| 232 | |
| 233 | int version, seg, nsegs; |
| 234 | int int_ldmbuf_size; |
| 235 | |
| 236 | ext_ldmbuf = (struct ext_elf32_dsbt_loadmap *) buf; |
| 237 | |
| 238 | /* Extract the version. */ |
| 239 | version = extract_unsigned_integer (ext_ldmbuf->version, |
| 240 | sizeof ext_ldmbuf->version, |
| 241 | byte_order); |
| 242 | if (version != 0) |
| 243 | { |
| 244 | /* We only handle version 0. */ |
| 245 | return NULL; |
| 246 | } |
| 247 | |
| 248 | /* Extract the number of segments. */ |
| 249 | nsegs = extract_unsigned_integer (ext_ldmbuf->nsegs, |
| 250 | sizeof ext_ldmbuf->nsegs, |
| 251 | byte_order); |
| 252 | |
| 253 | if (nsegs <= 0) |
| 254 | return NULL; |
| 255 | |
| 256 | /* Allocate space into which to put information extract from the |
| 257 | external loadsegs. I.e, allocate the internal loadsegs. */ |
| 258 | int_ldmbuf_size = (sizeof (struct int_elf32_dsbt_loadmap) |
| 259 | + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg)); |
| 260 | int_ldmbuf = (struct int_elf32_dsbt_loadmap *) xmalloc (int_ldmbuf_size); |
| 261 | |
| 262 | /* Place extracted information in internal structs. */ |
| 263 | int_ldmbuf->version = version; |
| 264 | int_ldmbuf->nsegs = nsegs; |
| 265 | for (seg = 0; seg < nsegs; seg++) |
| 266 | { |
| 267 | int_ldmbuf->segs[seg].addr |
| 268 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, |
| 269 | sizeof (ext_ldmbuf->segs[seg].addr), |
| 270 | byte_order); |
| 271 | int_ldmbuf->segs[seg].p_vaddr |
| 272 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, |
| 273 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), |
| 274 | byte_order); |
| 275 | int_ldmbuf->segs[seg].p_memsz |
| 276 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, |
| 277 | sizeof (ext_ldmbuf->segs[seg].p_memsz), |
| 278 | byte_order); |
| 279 | } |
| 280 | |
| 281 | return int_ldmbuf; |
| 282 | } |
| 283 | |
| 284 | |
| 285 | static struct dsbt_info *get_dsbt_info (void); |
| 286 | |
| 287 | /* Interrogate the Linux kernel to find out where the program was loaded. |
| 288 | There are two load maps; one for the executable and one for the |
| 289 | interpreter (only in the case of a dynamically linked executable). */ |
| 290 | |
| 291 | static void |
| 292 | dsbt_get_initial_loadmaps (void) |
| 293 | { |
| 294 | struct dsbt_info *info = get_dsbt_info (); |
| 295 | gdb::optional<gdb::byte_vector> buf |
| 296 | = target_read_alloc (current_top_target (), TARGET_OBJECT_FDPIC, "exec"); |
| 297 | |
| 298 | if (!buf || buf->empty ()) |
| 299 | { |
| 300 | info->exec_loadmap = NULL; |
| 301 | error (_("Error reading DSBT exec loadmap")); |
| 302 | } |
| 303 | info->exec_loadmap = decode_loadmap (buf->data ()); |
| 304 | if (solib_dsbt_debug) |
| 305 | dsbt_print_loadmap (info->exec_loadmap); |
| 306 | |
| 307 | buf = target_read_alloc (current_top_target (), TARGET_OBJECT_FDPIC, "exec"); |
| 308 | if (!buf || buf->empty ()) |
| 309 | { |
| 310 | info->interp_loadmap = NULL; |
| 311 | error (_("Error reading DSBT interp loadmap")); |
| 312 | } |
| 313 | info->interp_loadmap = decode_loadmap (buf->data ()); |
| 314 | if (solib_dsbt_debug) |
| 315 | dsbt_print_loadmap (info->interp_loadmap); |
| 316 | } |
| 317 | |
| 318 | /* Given address LDMADDR, fetch and decode the loadmap at that address. |
| 319 | Return NULL if there is a problem reading the target memory or if |
| 320 | there doesn't appear to be a loadmap at the given address. The |
| 321 | allocated space (representing the loadmap) returned by this |
| 322 | function may be freed via a single call to xfree. */ |
| 323 | |
| 324 | static struct int_elf32_dsbt_loadmap * |
| 325 | fetch_loadmap (CORE_ADDR ldmaddr) |
| 326 | { |
| 327 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 328 | struct ext_elf32_dsbt_loadmap ext_ldmbuf_partial; |
| 329 | struct ext_elf32_dsbt_loadmap *ext_ldmbuf; |
| 330 | struct int_elf32_dsbt_loadmap *int_ldmbuf; |
| 331 | int ext_ldmbuf_size, int_ldmbuf_size; |
| 332 | int version, seg, nsegs; |
| 333 | |
| 334 | /* Fetch initial portion of the loadmap. */ |
| 335 | if (target_read_memory (ldmaddr, (gdb_byte *) &ext_ldmbuf_partial, |
| 336 | sizeof ext_ldmbuf_partial)) |
| 337 | { |
| 338 | /* Problem reading the target's memory. */ |
| 339 | return NULL; |
| 340 | } |
| 341 | |
| 342 | /* Extract the version. */ |
| 343 | version = extract_unsigned_integer (ext_ldmbuf_partial.version, |
| 344 | sizeof ext_ldmbuf_partial.version, |
| 345 | byte_order); |
| 346 | if (version != 0) |
| 347 | { |
| 348 | /* We only handle version 0. */ |
| 349 | return NULL; |
| 350 | } |
| 351 | |
| 352 | /* Extract the number of segments. */ |
| 353 | nsegs = extract_unsigned_integer (ext_ldmbuf_partial.nsegs, |
| 354 | sizeof ext_ldmbuf_partial.nsegs, |
| 355 | byte_order); |
| 356 | |
| 357 | if (nsegs <= 0) |
| 358 | return NULL; |
| 359 | |
| 360 | /* Allocate space for the complete (external) loadmap. */ |
| 361 | ext_ldmbuf_size = sizeof (struct ext_elf32_dsbt_loadmap) |
| 362 | + (nsegs - 1) * sizeof (struct ext_elf32_dsbt_loadseg); |
| 363 | ext_ldmbuf = (struct ext_elf32_dsbt_loadmap *) xmalloc (ext_ldmbuf_size); |
| 364 | |
| 365 | /* Copy over the portion of the loadmap that's already been read. */ |
| 366 | memcpy (ext_ldmbuf, &ext_ldmbuf_partial, sizeof ext_ldmbuf_partial); |
| 367 | |
| 368 | /* Read the rest of the loadmap from the target. */ |
| 369 | if (target_read_memory (ldmaddr + sizeof ext_ldmbuf_partial, |
| 370 | (gdb_byte *) ext_ldmbuf + sizeof ext_ldmbuf_partial, |
| 371 | ext_ldmbuf_size - sizeof ext_ldmbuf_partial)) |
| 372 | { |
| 373 | /* Couldn't read rest of the loadmap. */ |
| 374 | xfree (ext_ldmbuf); |
| 375 | return NULL; |
| 376 | } |
| 377 | |
| 378 | /* Allocate space into which to put information extract from the |
| 379 | external loadsegs. I.e, allocate the internal loadsegs. */ |
| 380 | int_ldmbuf_size = sizeof (struct int_elf32_dsbt_loadmap) |
| 381 | + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg); |
| 382 | int_ldmbuf = (struct int_elf32_dsbt_loadmap *) xmalloc (int_ldmbuf_size); |
| 383 | |
| 384 | /* Place extracted information in internal structs. */ |
| 385 | int_ldmbuf->version = version; |
| 386 | int_ldmbuf->nsegs = nsegs; |
| 387 | for (seg = 0; seg < nsegs; seg++) |
| 388 | { |
| 389 | int_ldmbuf->segs[seg].addr |
| 390 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, |
| 391 | sizeof (ext_ldmbuf->segs[seg].addr), |
| 392 | byte_order); |
| 393 | int_ldmbuf->segs[seg].p_vaddr |
| 394 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, |
| 395 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), |
| 396 | byte_order); |
| 397 | int_ldmbuf->segs[seg].p_memsz |
| 398 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, |
| 399 | sizeof (ext_ldmbuf->segs[seg].p_memsz), |
| 400 | byte_order); |
| 401 | } |
| 402 | |
| 403 | xfree (ext_ldmbuf); |
| 404 | return int_ldmbuf; |
| 405 | } |
| 406 | |
| 407 | static void dsbt_relocate_main_executable (void); |
| 408 | static int enable_break (void); |
| 409 | |
| 410 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
| 411 | returned and the corresponding PTR is set. */ |
| 412 | |
| 413 | static int |
| 414 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) |
| 415 | { |
| 416 | int arch_size, step, sect_size; |
| 417 | long dyn_tag; |
| 418 | CORE_ADDR dyn_ptr, dyn_addr; |
| 419 | gdb_byte *bufend, *bufstart, *buf; |
| 420 | Elf32_External_Dyn *x_dynp_32; |
| 421 | Elf64_External_Dyn *x_dynp_64; |
| 422 | struct bfd_section *sect; |
| 423 | struct target_section *target_section; |
| 424 | |
| 425 | if (abfd == NULL) |
| 426 | return 0; |
| 427 | |
| 428 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 429 | return 0; |
| 430 | |
| 431 | arch_size = bfd_get_arch_size (abfd); |
| 432 | if (arch_size == -1) |
| 433 | return 0; |
| 434 | |
| 435 | /* Find the start address of the .dynamic section. */ |
| 436 | sect = bfd_get_section_by_name (abfd, ".dynamic"); |
| 437 | if (sect == NULL) |
| 438 | return 0; |
| 439 | |
| 440 | for (target_section = current_target_sections->sections; |
| 441 | target_section < current_target_sections->sections_end; |
| 442 | target_section++) |
| 443 | if (sect == target_section->the_bfd_section) |
| 444 | break; |
| 445 | if (target_section < current_target_sections->sections_end) |
| 446 | dyn_addr = target_section->addr; |
| 447 | else |
| 448 | { |
| 449 | /* ABFD may come from OBJFILE acting only as a symbol file without being |
| 450 | loaded into the target (see add_symbol_file_command). This case is |
| 451 | such fallback to the file VMA address without the possibility of |
| 452 | having the section relocated to its actual in-memory address. */ |
| 453 | |
| 454 | dyn_addr = bfd_section_vma (abfd, sect); |
| 455 | } |
| 456 | |
| 457 | /* Read in .dynamic from the BFD. We will get the actual value |
| 458 | from memory later. */ |
| 459 | sect_size = bfd_section_size (abfd, sect); |
| 460 | buf = bufstart = (gdb_byte *) alloca (sect_size); |
| 461 | if (!bfd_get_section_contents (abfd, sect, |
| 462 | buf, 0, sect_size)) |
| 463 | return 0; |
| 464 | |
| 465 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ |
| 466 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) |
| 467 | : sizeof (Elf64_External_Dyn); |
| 468 | for (bufend = buf + sect_size; |
| 469 | buf < bufend; |
| 470 | buf += step) |
| 471 | { |
| 472 | if (arch_size == 32) |
| 473 | { |
| 474 | x_dynp_32 = (Elf32_External_Dyn *) buf; |
| 475 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); |
| 476 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); |
| 477 | } |
| 478 | else |
| 479 | { |
| 480 | x_dynp_64 = (Elf64_External_Dyn *) buf; |
| 481 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); |
| 482 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); |
| 483 | } |
| 484 | if (dyn_tag == DT_NULL) |
| 485 | return 0; |
| 486 | if (dyn_tag == dyntag) |
| 487 | { |
| 488 | /* If requested, try to read the runtime value of this .dynamic |
| 489 | entry. */ |
| 490 | if (ptr) |
| 491 | { |
| 492 | struct type *ptr_type; |
| 493 | gdb_byte ptr_buf[8]; |
| 494 | CORE_ADDR ptr_addr; |
| 495 | |
| 496 | ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
| 497 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
| 498 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) |
| 499 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
| 500 | *ptr = dyn_ptr; |
| 501 | } |
| 502 | return 1; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | /* See solist.h. */ |
| 510 | |
| 511 | static int |
| 512 | open_symbol_file_object (int from_tty) |
| 513 | { |
| 514 | /* Unimplemented. */ |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | /* Given a loadmap and an address, return the displacement needed |
| 519 | to relocate the address. */ |
| 520 | |
| 521 | static CORE_ADDR |
| 522 | displacement_from_map (struct int_elf32_dsbt_loadmap *map, |
| 523 | CORE_ADDR addr) |
| 524 | { |
| 525 | int seg; |
| 526 | |
| 527 | for (seg = 0; seg < map->nsegs; seg++) |
| 528 | if (map->segs[seg].p_vaddr <= addr |
| 529 | && addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) |
| 530 | return map->segs[seg].addr - map->segs[seg].p_vaddr; |
| 531 | |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | /* Return the address from which the link map chain may be found. On |
| 536 | DSBT, a pointer to the start of the link map will be located at the |
| 537 | word found at base of GOT + GOT_MODULE_OFFSET. |
| 538 | |
| 539 | The base of GOT may be found in a number of ways. Assuming that the |
| 540 | main executable has already been relocated, |
| 541 | 1 The easiest way to find this value is to look up the address of |
| 542 | _GLOBAL_OFFSET_TABLE_. |
| 543 | 2 The other way is to look for tag DT_PLTGOT, which contains the virtual |
| 544 | address of Global Offset Table. .*/ |
| 545 | |
| 546 | static CORE_ADDR |
| 547 | lm_base (void) |
| 548 | { |
| 549 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 550 | struct bound_minimal_symbol got_sym; |
| 551 | CORE_ADDR addr; |
| 552 | gdb_byte buf[TIC6X_PTR_SIZE]; |
| 553 | struct dsbt_info *info = get_dsbt_info (); |
| 554 | |
| 555 | /* One of our assumptions is that the main executable has been relocated. |
| 556 | Bail out if this has not happened. (Note that post_create_inferior |
| 557 | in infcmd.c will call solib_add prior to solib_create_inferior_hook. |
| 558 | If we allow this to happen, lm_base_cache will be initialized with |
| 559 | a bogus value. */ |
| 560 | if (info->main_executable_lm_info == 0) |
| 561 | return 0; |
| 562 | |
| 563 | /* If we already have a cached value, return it. */ |
| 564 | if (info->lm_base_cache) |
| 565 | return info->lm_base_cache; |
| 566 | |
| 567 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", NULL, |
| 568 | symfile_objfile); |
| 569 | |
| 570 | if (got_sym.minsym != 0) |
| 571 | { |
| 572 | addr = BMSYMBOL_VALUE_ADDRESS (got_sym); |
| 573 | if (solib_dsbt_debug) |
| 574 | fprintf_unfiltered (gdb_stdlog, |
| 575 | "lm_base: get addr %x by _GLOBAL_OFFSET_TABLE_.\n", |
| 576 | (unsigned int) addr); |
| 577 | } |
| 578 | else if (scan_dyntag (DT_PLTGOT, exec_bfd, &addr)) |
| 579 | { |
| 580 | struct int_elf32_dsbt_loadmap *ldm; |
| 581 | |
| 582 | dsbt_get_initial_loadmaps (); |
| 583 | ldm = info->exec_loadmap; |
| 584 | addr += displacement_from_map (ldm, addr); |
| 585 | if (solib_dsbt_debug) |
| 586 | fprintf_unfiltered (gdb_stdlog, |
| 587 | "lm_base: get addr %x by DT_PLTGOT.\n", |
| 588 | (unsigned int) addr); |
| 589 | } |
| 590 | else |
| 591 | { |
| 592 | if (solib_dsbt_debug) |
| 593 | fprintf_unfiltered (gdb_stdlog, |
| 594 | "lm_base: _GLOBAL_OFFSET_TABLE_ not found.\n"); |
| 595 | return 0; |
| 596 | } |
| 597 | addr += GOT_MODULE_OFFSET; |
| 598 | |
| 599 | if (solib_dsbt_debug) |
| 600 | fprintf_unfiltered (gdb_stdlog, |
| 601 | "lm_base: _GLOBAL_OFFSET_TABLE_ + %d = %s\n", |
| 602 | GOT_MODULE_OFFSET, hex_string_custom (addr, 8)); |
| 603 | |
| 604 | if (target_read_memory (addr, buf, sizeof buf) != 0) |
| 605 | return 0; |
| 606 | info->lm_base_cache = extract_unsigned_integer (buf, sizeof buf, byte_order); |
| 607 | |
| 608 | if (solib_dsbt_debug) |
| 609 | fprintf_unfiltered (gdb_stdlog, |
| 610 | "lm_base: lm_base_cache = %s\n", |
| 611 | hex_string_custom (info->lm_base_cache, 8)); |
| 612 | |
| 613 | return info->lm_base_cache; |
| 614 | } |
| 615 | |
| 616 | |
| 617 | /* Build a list of `struct so_list' objects describing the shared |
| 618 | objects currently loaded in the inferior. This list does not |
| 619 | include an entry for the main executable file. |
| 620 | |
| 621 | Note that we only gather information directly available from the |
| 622 | inferior --- we don't examine any of the shared library files |
| 623 | themselves. The declaration of `struct so_list' says which fields |
| 624 | we provide values for. */ |
| 625 | |
| 626 | static struct so_list * |
| 627 | dsbt_current_sos (void) |
| 628 | { |
| 629 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 630 | CORE_ADDR lm_addr; |
| 631 | struct so_list *sos_head = NULL; |
| 632 | struct so_list **sos_next_ptr = &sos_head; |
| 633 | struct dsbt_info *info = get_dsbt_info (); |
| 634 | |
| 635 | /* Make sure that the main executable has been relocated. This is |
| 636 | required in order to find the address of the global offset table, |
| 637 | which in turn is used to find the link map info. (See lm_base |
| 638 | for details.) |
| 639 | |
| 640 | Note that the relocation of the main executable is also performed |
| 641 | by solib_create_inferior_hook, however, in the case of core |
| 642 | files, this hook is called too late in order to be of benefit to |
| 643 | solib_add. solib_add eventually calls this function, |
| 644 | dsbt_current_sos, and also precedes the call to |
| 645 | solib_create_inferior_hook. (See post_create_inferior in |
| 646 | infcmd.c.) */ |
| 647 | if (info->main_executable_lm_info == 0 && core_bfd != NULL) |
| 648 | dsbt_relocate_main_executable (); |
| 649 | |
| 650 | /* Locate the address of the first link map struct. */ |
| 651 | lm_addr = lm_base (); |
| 652 | |
| 653 | /* We have at least one link map entry. Fetch the lot of them, |
| 654 | building the solist chain. */ |
| 655 | while (lm_addr) |
| 656 | { |
| 657 | struct ext_link_map lm_buf; |
| 658 | ext_Elf32_Word indexword; |
| 659 | CORE_ADDR map_addr; |
| 660 | int dsbt_index; |
| 661 | int ret; |
| 662 | |
| 663 | if (solib_dsbt_debug) |
| 664 | fprintf_unfiltered (gdb_stdlog, |
| 665 | "current_sos: reading link_map entry at %s\n", |
| 666 | hex_string_custom (lm_addr, 8)); |
| 667 | |
| 668 | ret = target_read_memory (lm_addr, (gdb_byte *) &lm_buf, sizeof (lm_buf)); |
| 669 | if (ret) |
| 670 | { |
| 671 | warning (_("dsbt_current_sos: Unable to read link map entry." |
| 672 | " Shared object chain may be incomplete.")); |
| 673 | break; |
| 674 | } |
| 675 | |
| 676 | /* Fetch the load map address. */ |
| 677 | map_addr = extract_unsigned_integer (lm_buf.l_addr.map, |
| 678 | sizeof lm_buf.l_addr.map, |
| 679 | byte_order); |
| 680 | |
| 681 | ret = target_read_memory (map_addr + 12, (gdb_byte *) &indexword, |
| 682 | sizeof indexword); |
| 683 | if (ret) |
| 684 | { |
| 685 | warning (_("dsbt_current_sos: Unable to read dsbt index." |
| 686 | " Shared object chain may be incomplete.")); |
| 687 | break; |
| 688 | } |
| 689 | dsbt_index = extract_unsigned_integer (indexword, sizeof indexword, |
| 690 | byte_order); |
| 691 | |
| 692 | /* If the DSBT index is zero, then we're looking at the entry |
| 693 | for the main executable. By convention, we don't include |
| 694 | this in the list of shared objects. */ |
| 695 | if (dsbt_index != 0) |
| 696 | { |
| 697 | int errcode; |
| 698 | gdb::unique_xmalloc_ptr<char> name_buf; |
| 699 | struct int_elf32_dsbt_loadmap *loadmap; |
| 700 | struct so_list *sop; |
| 701 | CORE_ADDR addr; |
| 702 | |
| 703 | loadmap = fetch_loadmap (map_addr); |
| 704 | if (loadmap == NULL) |
| 705 | { |
| 706 | warning (_("dsbt_current_sos: Unable to fetch load map." |
| 707 | " Shared object chain may be incomplete.")); |
| 708 | break; |
| 709 | } |
| 710 | |
| 711 | sop = XCNEW (struct so_list); |
| 712 | lm_info_dsbt *li = new lm_info_dsbt; |
| 713 | sop->lm_info = li; |
| 714 | li->map = loadmap; |
| 715 | /* Fetch the name. */ |
| 716 | addr = extract_unsigned_integer (lm_buf.l_name, |
| 717 | sizeof (lm_buf.l_name), |
| 718 | byte_order); |
| 719 | target_read_string (addr, &name_buf, SO_NAME_MAX_PATH_SIZE - 1, |
| 720 | &errcode); |
| 721 | |
| 722 | if (errcode != 0) |
| 723 | warning (_("Can't read pathname for link map entry: %s."), |
| 724 | safe_strerror (errcode)); |
| 725 | else |
| 726 | { |
| 727 | if (solib_dsbt_debug) |
| 728 | fprintf_unfiltered (gdb_stdlog, "current_sos: name = %s\n", |
| 729 | name_buf.get ()); |
| 730 | |
| 731 | strncpy (sop->so_name, name_buf.get (), SO_NAME_MAX_PATH_SIZE - 1); |
| 732 | sop->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| 733 | strcpy (sop->so_original_name, sop->so_name); |
| 734 | } |
| 735 | |
| 736 | *sos_next_ptr = sop; |
| 737 | sos_next_ptr = &sop->next; |
| 738 | } |
| 739 | else |
| 740 | { |
| 741 | info->main_lm_addr = lm_addr; |
| 742 | } |
| 743 | |
| 744 | lm_addr = extract_unsigned_integer (lm_buf.l_next, |
| 745 | sizeof (lm_buf.l_next), byte_order); |
| 746 | } |
| 747 | |
| 748 | return sos_head; |
| 749 | } |
| 750 | |
| 751 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
| 752 | run time loader. */ |
| 753 | |
| 754 | static int |
| 755 | dsbt_in_dynsym_resolve_code (CORE_ADDR pc) |
| 756 | { |
| 757 | struct dsbt_info *info = get_dsbt_info (); |
| 758 | |
| 759 | return ((pc >= info->interp_text_sect_low && pc < info->interp_text_sect_high) |
| 760 | || (pc >= info->interp_plt_sect_low && pc < info->interp_plt_sect_high) |
| 761 | || in_plt_section (pc)); |
| 762 | } |
| 763 | |
| 764 | /* Print a warning about being unable to set the dynamic linker |
| 765 | breakpoint. */ |
| 766 | |
| 767 | static void |
| 768 | enable_break_failure_warning (void) |
| 769 | { |
| 770 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
| 771 | "GDB will be unable to debug shared library initializers\n" |
| 772 | "and track explicitly loaded dynamic code.")); |
| 773 | } |
| 774 | |
| 775 | /* Helper function for gdb_bfd_lookup_symbol. */ |
| 776 | |
| 777 | static int |
| 778 | cmp_name (const asymbol *sym, const void *data) |
| 779 | { |
| 780 | return (strcmp (sym->name, (const char *) data) == 0); |
| 781 | } |
| 782 | |
| 783 | /* The dynamic linkers has, as part of its debugger interface, support |
| 784 | for arranging for the inferior to hit a breakpoint after mapping in |
| 785 | the shared libraries. This function enables that breakpoint. |
| 786 | |
| 787 | On the TIC6X, using the shared library (DSBT), GDB can try to place |
| 788 | a breakpoint on '_dl_debug_state' to monitor the shared library |
| 789 | event. */ |
| 790 | |
| 791 | static int |
| 792 | enable_break (void) |
| 793 | { |
| 794 | asection *interp_sect; |
| 795 | struct dsbt_info *info; |
| 796 | |
| 797 | if (exec_bfd == NULL) |
| 798 | return 0; |
| 799 | |
| 800 | if (!target_has_execution) |
| 801 | return 0; |
| 802 | |
| 803 | info = get_dsbt_info (); |
| 804 | |
| 805 | info->interp_text_sect_low = 0; |
| 806 | info->interp_text_sect_high = 0; |
| 807 | info->interp_plt_sect_low = 0; |
| 808 | info->interp_plt_sect_high = 0; |
| 809 | |
| 810 | /* Find the .interp section; if not found, warn the user and drop |
| 811 | into the old breakpoint at symbol code. */ |
| 812 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); |
| 813 | if (interp_sect) |
| 814 | { |
| 815 | unsigned int interp_sect_size; |
| 816 | char *buf; |
| 817 | CORE_ADDR addr; |
| 818 | struct int_elf32_dsbt_loadmap *ldm; |
| 819 | int ret; |
| 820 | |
| 821 | /* Read the contents of the .interp section into a local buffer; |
| 822 | the contents specify the dynamic linker this program uses. */ |
| 823 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
| 824 | buf = (char *) alloca (interp_sect_size); |
| 825 | bfd_get_section_contents (exec_bfd, interp_sect, |
| 826 | buf, 0, interp_sect_size); |
| 827 | |
| 828 | /* Now we need to figure out where the dynamic linker was |
| 829 | loaded so that we can load its symbols and place a breakpoint |
| 830 | in the dynamic linker itself. */ |
| 831 | |
| 832 | gdb_bfd_ref_ptr tmp_bfd; |
| 833 | TRY |
| 834 | { |
| 835 | tmp_bfd = solib_bfd_open (buf); |
| 836 | } |
| 837 | CATCH (ex, RETURN_MASK_ALL) |
| 838 | { |
| 839 | } |
| 840 | END_CATCH |
| 841 | |
| 842 | if (tmp_bfd == NULL) |
| 843 | { |
| 844 | enable_break_failure_warning (); |
| 845 | return 0; |
| 846 | } |
| 847 | |
| 848 | dsbt_get_initial_loadmaps (); |
| 849 | ldm = info->interp_loadmap; |
| 850 | |
| 851 | /* Record the relocated start and end address of the dynamic linker |
| 852 | text and plt section for dsbt_in_dynsym_resolve_code. */ |
| 853 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".text"); |
| 854 | if (interp_sect) |
| 855 | { |
| 856 | info->interp_text_sect_low |
| 857 | = bfd_section_vma (tmp_bfd.get (), interp_sect); |
| 858 | info->interp_text_sect_low |
| 859 | += displacement_from_map (ldm, info->interp_text_sect_low); |
| 860 | info->interp_text_sect_high |
| 861 | = info->interp_text_sect_low |
| 862 | + bfd_section_size (tmp_bfd.get (), interp_sect); |
| 863 | } |
| 864 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".plt"); |
| 865 | if (interp_sect) |
| 866 | { |
| 867 | info->interp_plt_sect_low = |
| 868 | bfd_section_vma (tmp_bfd.get (), interp_sect); |
| 869 | info->interp_plt_sect_low |
| 870 | += displacement_from_map (ldm, info->interp_plt_sect_low); |
| 871 | info->interp_plt_sect_high = |
| 872 | info->interp_plt_sect_low + bfd_section_size (tmp_bfd.get (), |
| 873 | interp_sect); |
| 874 | } |
| 875 | |
| 876 | addr = gdb_bfd_lookup_symbol (tmp_bfd.get (), cmp_name, |
| 877 | "_dl_debug_state"); |
| 878 | if (addr != 0) |
| 879 | { |
| 880 | if (solib_dsbt_debug) |
| 881 | fprintf_unfiltered (gdb_stdlog, |
| 882 | "enable_break: _dl_debug_state (prior to relocation) = %s\n", |
| 883 | hex_string_custom (addr, 8)); |
| 884 | addr += displacement_from_map (ldm, addr); |
| 885 | |
| 886 | if (solib_dsbt_debug) |
| 887 | fprintf_unfiltered (gdb_stdlog, |
| 888 | "enable_break: _dl_debug_state (after relocation) = %s\n", |
| 889 | hex_string_custom (addr, 8)); |
| 890 | |
| 891 | /* Now (finally!) create the solib breakpoint. */ |
| 892 | create_solib_event_breakpoint (target_gdbarch (), addr); |
| 893 | |
| 894 | ret = 1; |
| 895 | } |
| 896 | else |
| 897 | { |
| 898 | if (solib_dsbt_debug) |
| 899 | fprintf_unfiltered (gdb_stdlog, |
| 900 | "enable_break: _dl_debug_state is not found\n"); |
| 901 | ret = 0; |
| 902 | } |
| 903 | |
| 904 | /* We're done with the loadmap. */ |
| 905 | xfree (ldm); |
| 906 | |
| 907 | return ret; |
| 908 | } |
| 909 | |
| 910 | /* Tell the user we couldn't set a dynamic linker breakpoint. */ |
| 911 | enable_break_failure_warning (); |
| 912 | |
| 913 | /* Failure return. */ |
| 914 | return 0; |
| 915 | } |
| 916 | |
| 917 | static void |
| 918 | dsbt_relocate_main_executable (void) |
| 919 | { |
| 920 | struct int_elf32_dsbt_loadmap *ldm; |
| 921 | int changed; |
| 922 | struct obj_section *osect; |
| 923 | struct dsbt_info *info = get_dsbt_info (); |
| 924 | |
| 925 | dsbt_get_initial_loadmaps (); |
| 926 | ldm = info->exec_loadmap; |
| 927 | |
| 928 | delete info->main_executable_lm_info; |
| 929 | info->main_executable_lm_info = new lm_info_dsbt; |
| 930 | info->main_executable_lm_info->map = ldm; |
| 931 | |
| 932 | gdb::unique_xmalloc_ptr<struct section_offsets> new_offsets |
| 933 | (XCNEWVEC (struct section_offsets, symfile_objfile->num_sections)); |
| 934 | changed = 0; |
| 935 | |
| 936 | ALL_OBJFILE_OSECTIONS (symfile_objfile, osect) |
| 937 | { |
| 938 | CORE_ADDR orig_addr, addr, offset; |
| 939 | int osect_idx; |
| 940 | int seg; |
| 941 | |
| 942 | osect_idx = osect - symfile_objfile->sections; |
| 943 | |
| 944 | /* Current address of section. */ |
| 945 | addr = obj_section_addr (osect); |
| 946 | /* Offset from where this section started. */ |
| 947 | offset = ANOFFSET (symfile_objfile->section_offsets, osect_idx); |
| 948 | /* Original address prior to any past relocations. */ |
| 949 | orig_addr = addr - offset; |
| 950 | |
| 951 | for (seg = 0; seg < ldm->nsegs; seg++) |
| 952 | { |
| 953 | if (ldm->segs[seg].p_vaddr <= orig_addr |
| 954 | && orig_addr < ldm->segs[seg].p_vaddr + ldm->segs[seg].p_memsz) |
| 955 | { |
| 956 | new_offsets->offsets[osect_idx] |
| 957 | = ldm->segs[seg].addr - ldm->segs[seg].p_vaddr; |
| 958 | |
| 959 | if (new_offsets->offsets[osect_idx] != offset) |
| 960 | changed = 1; |
| 961 | break; |
| 962 | } |
| 963 | } |
| 964 | } |
| 965 | |
| 966 | if (changed) |
| 967 | objfile_relocate (symfile_objfile, new_offsets.get ()); |
| 968 | |
| 969 | /* Now that symfile_objfile has been relocated, we can compute the |
| 970 | GOT value and stash it away. */ |
| 971 | } |
| 972 | |
| 973 | /* When gdb starts up the inferior, it nurses it along (through the |
| 974 | shell) until it is ready to execute it's first instruction. At this |
| 975 | point, this function gets called via solib_create_inferior_hook. |
| 976 | |
| 977 | For the DSBT shared library, the main executable needs to be relocated. |
| 978 | The shared library breakpoints also need to be enabled. */ |
| 979 | |
| 980 | static void |
| 981 | dsbt_solib_create_inferior_hook (int from_tty) |
| 982 | { |
| 983 | /* Relocate main executable. */ |
| 984 | dsbt_relocate_main_executable (); |
| 985 | |
| 986 | /* Enable shared library breakpoints. */ |
| 987 | if (!enable_break ()) |
| 988 | { |
| 989 | warning (_("shared library handler failed to enable breakpoint")); |
| 990 | return; |
| 991 | } |
| 992 | } |
| 993 | |
| 994 | static void |
| 995 | dsbt_clear_solib (void) |
| 996 | { |
| 997 | struct dsbt_info *info = get_dsbt_info (); |
| 998 | |
| 999 | info->lm_base_cache = 0; |
| 1000 | info->main_lm_addr = 0; |
| 1001 | |
| 1002 | delete info->main_executable_lm_info; |
| 1003 | info->main_executable_lm_info = NULL; |
| 1004 | } |
| 1005 | |
| 1006 | static void |
| 1007 | dsbt_free_so (struct so_list *so) |
| 1008 | { |
| 1009 | lm_info_dsbt *li = (lm_info_dsbt *) so->lm_info; |
| 1010 | |
| 1011 | delete li; |
| 1012 | } |
| 1013 | |
| 1014 | static void |
| 1015 | dsbt_relocate_section_addresses (struct so_list *so, |
| 1016 | struct target_section *sec) |
| 1017 | { |
| 1018 | int seg; |
| 1019 | lm_info_dsbt *li = (lm_info_dsbt *) so->lm_info; |
| 1020 | int_elf32_dsbt_loadmap *map = li->map; |
| 1021 | |
| 1022 | for (seg = 0; seg < map->nsegs; seg++) |
| 1023 | { |
| 1024 | if (map->segs[seg].p_vaddr <= sec->addr |
| 1025 | && sec->addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) |
| 1026 | { |
| 1027 | CORE_ADDR displ = map->segs[seg].addr - map->segs[seg].p_vaddr; |
| 1028 | |
| 1029 | sec->addr += displ; |
| 1030 | sec->endaddr += displ; |
| 1031 | break; |
| 1032 | } |
| 1033 | } |
| 1034 | } |
| 1035 | static void |
| 1036 | show_dsbt_debug (struct ui_file *file, int from_tty, |
| 1037 | struct cmd_list_element *c, const char *value) |
| 1038 | { |
| 1039 | fprintf_filtered (file, _("solib-dsbt debugging is %s.\n"), value); |
| 1040 | } |
| 1041 | |
| 1042 | struct target_so_ops dsbt_so_ops; |
| 1043 | |
| 1044 | void |
| 1045 | _initialize_dsbt_solib (void) |
| 1046 | { |
| 1047 | solib_dsbt_pspace_data |
| 1048 | = register_program_space_data_with_cleanup (NULL, dsbt_pspace_data_cleanup); |
| 1049 | |
| 1050 | dsbt_so_ops.relocate_section_addresses = dsbt_relocate_section_addresses; |
| 1051 | dsbt_so_ops.free_so = dsbt_free_so; |
| 1052 | dsbt_so_ops.clear_solib = dsbt_clear_solib; |
| 1053 | dsbt_so_ops.solib_create_inferior_hook = dsbt_solib_create_inferior_hook; |
| 1054 | dsbt_so_ops.current_sos = dsbt_current_sos; |
| 1055 | dsbt_so_ops.open_symbol_file_object = open_symbol_file_object; |
| 1056 | dsbt_so_ops.in_dynsym_resolve_code = dsbt_in_dynsym_resolve_code; |
| 1057 | dsbt_so_ops.bfd_open = solib_bfd_open; |
| 1058 | |
| 1059 | /* Debug this file's internals. */ |
| 1060 | add_setshow_zuinteger_cmd ("solib-dsbt", class_maintenance, |
| 1061 | &solib_dsbt_debug, _("\ |
| 1062 | Set internal debugging of shared library code for DSBT ELF."), _("\ |
| 1063 | Show internal debugging of shared library code for DSBT ELF."), _("\ |
| 1064 | When non-zero, DSBT solib specific internal debugging is enabled."), |
| 1065 | NULL, |
| 1066 | show_dsbt_debug, |
| 1067 | &setdebuglist, &showdebuglist); |
| 1068 | } |