| 1 | /* nto-tdep.c - general QNX Neutrino target functionality. |
| 2 | |
| 3 | Copyright (C) 2003-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by QNX Software Systems Ltd. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include <sys/stat.h> |
| 24 | #include "nto-tdep.h" |
| 25 | #include "top.h" |
| 26 | #include "inferior.h" |
| 27 | #include "infrun.h" |
| 28 | #include "gdbarch.h" |
| 29 | #include "bfd.h" |
| 30 | #include "elf-bfd.h" |
| 31 | #include "solib-svr4.h" |
| 32 | #include "gdbcore.h" |
| 33 | #include "objfiles.h" |
| 34 | #include "source.h" |
| 35 | #include "gdbsupport/pathstuff.h" |
| 36 | |
| 37 | #define QNX_NOTE_NAME "QNX" |
| 38 | #define QNX_INFO_SECT_NAME "QNX_info" |
| 39 | |
| 40 | #ifdef __CYGWIN__ |
| 41 | #include <sys/cygwin.h> |
| 42 | #endif |
| 43 | |
| 44 | #ifdef __CYGWIN__ |
| 45 | static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6"; |
| 46 | #elif defined(__sun__) || defined(linux) |
| 47 | static char default_nto_target[] = "/opt/QNXsdk/target/qnx6"; |
| 48 | #else |
| 49 | static char default_nto_target[] = ""; |
| 50 | #endif |
| 51 | |
| 52 | struct nto_target_ops current_nto_target; |
| 53 | |
| 54 | static const struct inferior_key<struct nto_inferior_data> |
| 55 | nto_inferior_data_reg; |
| 56 | |
| 57 | static char * |
| 58 | nto_target (void) |
| 59 | { |
| 60 | char *p = getenv ("QNX_TARGET"); |
| 61 | |
| 62 | #ifdef __CYGWIN__ |
| 63 | static char buf[PATH_MAX]; |
| 64 | if (p) |
| 65 | cygwin_conv_path (CCP_WIN_A_TO_POSIX, p, buf, PATH_MAX); |
| 66 | else |
| 67 | cygwin_conv_path (CCP_WIN_A_TO_POSIX, default_nto_target, buf, PATH_MAX); |
| 68 | return buf; |
| 69 | #else |
| 70 | return p ? p : default_nto_target; |
| 71 | #endif |
| 72 | } |
| 73 | |
| 74 | /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86, |
| 75 | CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h. */ |
| 76 | int |
| 77 | nto_map_arch_to_cputype (const char *arch) |
| 78 | { |
| 79 | if (!strcmp (arch, "i386") || !strcmp (arch, "x86")) |
| 80 | return CPUTYPE_X86; |
| 81 | if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc")) |
| 82 | return CPUTYPE_PPC; |
| 83 | if (!strcmp (arch, "mips")) |
| 84 | return CPUTYPE_MIPS; |
| 85 | if (!strcmp (arch, "arm")) |
| 86 | return CPUTYPE_ARM; |
| 87 | if (!strcmp (arch, "sh")) |
| 88 | return CPUTYPE_SH; |
| 89 | return CPUTYPE_UNKNOWN; |
| 90 | } |
| 91 | |
| 92 | int |
| 93 | nto_find_and_open_solib (const char *solib, unsigned o_flags, |
| 94 | gdb::unique_xmalloc_ptr<char> *temp_pathname) |
| 95 | { |
| 96 | char *buf, *arch_path, *nto_root; |
| 97 | const char *endian; |
| 98 | const char *base; |
| 99 | const char *arch; |
| 100 | int arch_len, len, ret; |
| 101 | #define PATH_FMT \ |
| 102 | "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll" |
| 103 | |
| 104 | nto_root = nto_target (); |
| 105 | if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0) |
| 106 | { |
| 107 | arch = "x86"; |
| 108 | endian = ""; |
| 109 | } |
| 110 | else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, |
| 111 | "rs6000") == 0 |
| 112 | || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, |
| 113 | "powerpc") == 0) |
| 114 | { |
| 115 | arch = "ppc"; |
| 116 | endian = "be"; |
| 117 | } |
| 118 | else |
| 119 | { |
| 120 | arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name; |
| 121 | endian = gdbarch_byte_order (target_gdbarch ()) |
| 122 | == BFD_ENDIAN_BIG ? "be" : "le"; |
| 123 | } |
| 124 | |
| 125 | /* In case nto_root is short, add strlen(solib) |
| 126 | so we can reuse arch_path below. */ |
| 127 | |
| 128 | arch_len = (strlen (nto_root) + strlen (arch) + strlen (endian) + 2 |
| 129 | + strlen (solib)); |
| 130 | arch_path = (char *) alloca (arch_len); |
| 131 | xsnprintf (arch_path, arch_len, "%s/%s%s", nto_root, arch, endian); |
| 132 | |
| 133 | len = strlen (PATH_FMT) + strlen (arch_path) * 5 + 1; |
| 134 | buf = (char *) alloca (len); |
| 135 | xsnprintf (buf, len, PATH_FMT, arch_path, arch_path, arch_path, arch_path, |
| 136 | arch_path); |
| 137 | |
| 138 | base = lbasename (solib); |
| 139 | ret = openp (buf, OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, base, o_flags, |
| 140 | temp_pathname); |
| 141 | if (ret < 0 && base != solib) |
| 142 | { |
| 143 | xsnprintf (arch_path, arch_len, "/%s", solib); |
| 144 | ret = open (arch_path, o_flags, 0); |
| 145 | if (temp_pathname) |
| 146 | { |
| 147 | if (ret >= 0) |
| 148 | *temp_pathname = gdb_realpath (arch_path); |
| 149 | else |
| 150 | temp_pathname->reset (NULL); |
| 151 | } |
| 152 | } |
| 153 | return ret; |
| 154 | } |
| 155 | |
| 156 | void |
| 157 | nto_init_solib_absolute_prefix (void) |
| 158 | { |
| 159 | char buf[PATH_MAX * 2], arch_path[PATH_MAX]; |
| 160 | char *nto_root; |
| 161 | const char *endian; |
| 162 | const char *arch; |
| 163 | |
| 164 | nto_root = nto_target (); |
| 165 | if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0) |
| 166 | { |
| 167 | arch = "x86"; |
| 168 | endian = ""; |
| 169 | } |
| 170 | else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, |
| 171 | "rs6000") == 0 |
| 172 | || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, |
| 173 | "powerpc") == 0) |
| 174 | { |
| 175 | arch = "ppc"; |
| 176 | endian = "be"; |
| 177 | } |
| 178 | else |
| 179 | { |
| 180 | arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name; |
| 181 | endian = gdbarch_byte_order (target_gdbarch ()) |
| 182 | == BFD_ENDIAN_BIG ? "be" : "le"; |
| 183 | } |
| 184 | |
| 185 | xsnprintf (arch_path, sizeof (arch_path), "%s/%s%s", nto_root, arch, endian); |
| 186 | |
| 187 | xsnprintf (buf, sizeof (buf), "set solib-absolute-prefix %s", arch_path); |
| 188 | execute_command (buf, 0); |
| 189 | } |
| 190 | |
| 191 | char ** |
| 192 | nto_parse_redirection (char *pargv[], const char **pin, const char **pout, |
| 193 | const char **perr) |
| 194 | { |
| 195 | char **argv; |
| 196 | const char *in, *out, *err, *p; |
| 197 | int argc, i, n; |
| 198 | |
| 199 | for (n = 0; pargv[n]; n++); |
| 200 | if (n == 0) |
| 201 | return NULL; |
| 202 | in = ""; |
| 203 | out = ""; |
| 204 | err = ""; |
| 205 | |
| 206 | argv = XCNEWVEC (char *, n + 1); |
| 207 | argc = n; |
| 208 | for (i = 0, n = 0; n < argc; n++) |
| 209 | { |
| 210 | p = pargv[n]; |
| 211 | if (*p == '>') |
| 212 | { |
| 213 | p++; |
| 214 | if (*p) |
| 215 | out = p; |
| 216 | else |
| 217 | out = pargv[++n]; |
| 218 | } |
| 219 | else if (*p == '<') |
| 220 | { |
| 221 | p++; |
| 222 | if (*p) |
| 223 | in = p; |
| 224 | else |
| 225 | in = pargv[++n]; |
| 226 | } |
| 227 | else if (*p++ == '2' && *p++ == '>') |
| 228 | { |
| 229 | if (*p == '&' && *(p + 1) == '1') |
| 230 | err = out; |
| 231 | else if (*p) |
| 232 | err = p; |
| 233 | else |
| 234 | err = pargv[++n]; |
| 235 | } |
| 236 | else |
| 237 | argv[i++] = pargv[n]; |
| 238 | } |
| 239 | *pin = in; |
| 240 | *pout = out; |
| 241 | *perr = err; |
| 242 | return argv; |
| 243 | } |
| 244 | |
| 245 | static CORE_ADDR |
| 246 | lm_addr (struct so_list *so) |
| 247 | { |
| 248 | lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info; |
| 249 | |
| 250 | return li->l_addr; |
| 251 | } |
| 252 | |
| 253 | static CORE_ADDR |
| 254 | nto_truncate_ptr (CORE_ADDR addr) |
| 255 | { |
| 256 | if (gdbarch_ptr_bit (target_gdbarch ()) == sizeof (CORE_ADDR) * 8) |
| 257 | /* We don't need to truncate anything, and the bit twiddling below |
| 258 | will fail due to overflow problems. */ |
| 259 | return addr; |
| 260 | else |
| 261 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch ())) - 1); |
| 262 | } |
| 263 | |
| 264 | static Elf_Internal_Phdr * |
| 265 | find_load_phdr (bfd *abfd) |
| 266 | { |
| 267 | Elf_Internal_Phdr *phdr; |
| 268 | unsigned int i; |
| 269 | |
| 270 | if (!elf_tdata (abfd)) |
| 271 | return NULL; |
| 272 | |
| 273 | phdr = elf_tdata (abfd)->phdr; |
| 274 | for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++) |
| 275 | { |
| 276 | if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X)) |
| 277 | return phdr; |
| 278 | } |
| 279 | return NULL; |
| 280 | } |
| 281 | |
| 282 | void |
| 283 | nto_relocate_section_addresses (struct so_list *so, struct target_section *sec) |
| 284 | { |
| 285 | /* Neutrino treats the l_addr base address field in link.h as different than |
| 286 | the base address in the System V ABI and so the offset needs to be |
| 287 | calculated and applied to relocations. */ |
| 288 | Elf_Internal_Phdr *phdr = find_load_phdr (sec->the_bfd_section->owner); |
| 289 | unsigned vaddr = phdr ? phdr->p_vaddr : 0; |
| 290 | |
| 291 | sec->addr = nto_truncate_ptr (sec->addr + lm_addr (so) - vaddr); |
| 292 | sec->endaddr = nto_truncate_ptr (sec->endaddr + lm_addr (so) - vaddr); |
| 293 | } |
| 294 | |
| 295 | /* This is cheating a bit because our linker code is in libc.so. If we |
| 296 | ever implement lazy linking, this may need to be re-examined. */ |
| 297 | int |
| 298 | nto_in_dynsym_resolve_code (CORE_ADDR pc) |
| 299 | { |
| 300 | if (in_plt_section (pc)) |
| 301 | return 1; |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | void |
| 306 | nto_dummy_supply_regset (struct regcache *regcache, char *regs) |
| 307 | { |
| 308 | /* Do nothing. */ |
| 309 | } |
| 310 | |
| 311 | static void |
| 312 | nto_sniff_abi_note_section (bfd *abfd, asection *sect, void *obj) |
| 313 | { |
| 314 | const char *sectname; |
| 315 | unsigned int sectsize; |
| 316 | /* Buffer holding the section contents. */ |
| 317 | char *note; |
| 318 | unsigned int namelen; |
| 319 | const char *name; |
| 320 | const unsigned sizeof_Elf_Nhdr = 12; |
| 321 | |
| 322 | sectname = bfd_section_name (sect); |
| 323 | sectsize = bfd_section_size (sect); |
| 324 | |
| 325 | if (sectsize > 128) |
| 326 | sectsize = 128; |
| 327 | |
| 328 | if (sectname != NULL && strstr (sectname, QNX_INFO_SECT_NAME) != NULL) |
| 329 | *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO; |
| 330 | else if (sectname != NULL && strstr (sectname, "note") != NULL |
| 331 | && sectsize > sizeof_Elf_Nhdr) |
| 332 | { |
| 333 | note = XNEWVEC (char, sectsize); |
| 334 | bfd_get_section_contents (abfd, sect, note, 0, sectsize); |
| 335 | namelen = (unsigned int) bfd_h_get_32 (abfd, note); |
| 336 | name = note + sizeof_Elf_Nhdr; |
| 337 | if (sectsize >= namelen + sizeof_Elf_Nhdr |
| 338 | && namelen == sizeof (QNX_NOTE_NAME) |
| 339 | && 0 == strcmp (name, QNX_NOTE_NAME)) |
| 340 | *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO; |
| 341 | |
| 342 | XDELETEVEC (note); |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | enum gdb_osabi |
| 347 | nto_elf_osabi_sniffer (bfd *abfd) |
| 348 | { |
| 349 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
| 350 | |
| 351 | bfd_map_over_sections (abfd, |
| 352 | nto_sniff_abi_note_section, |
| 353 | &osabi); |
| 354 | |
| 355 | return osabi; |
| 356 | } |
| 357 | |
| 358 | static const char *nto_thread_state_str[] = |
| 359 | { |
| 360 | "DEAD", /* 0 0x00 */ |
| 361 | "RUNNING", /* 1 0x01 */ |
| 362 | "READY", /* 2 0x02 */ |
| 363 | "STOPPED", /* 3 0x03 */ |
| 364 | "SEND", /* 4 0x04 */ |
| 365 | "RECEIVE", /* 5 0x05 */ |
| 366 | "REPLY", /* 6 0x06 */ |
| 367 | "STACK", /* 7 0x07 */ |
| 368 | "WAITTHREAD", /* 8 0x08 */ |
| 369 | "WAITPAGE", /* 9 0x09 */ |
| 370 | "SIGSUSPEND", /* 10 0x0a */ |
| 371 | "SIGWAITINFO", /* 11 0x0b */ |
| 372 | "NANOSLEEP", /* 12 0x0c */ |
| 373 | "MUTEX", /* 13 0x0d */ |
| 374 | "CONDVAR", /* 14 0x0e */ |
| 375 | "JOIN", /* 15 0x0f */ |
| 376 | "INTR", /* 16 0x10 */ |
| 377 | "SEM", /* 17 0x11 */ |
| 378 | "WAITCTX", /* 18 0x12 */ |
| 379 | "NET_SEND", /* 19 0x13 */ |
| 380 | "NET_REPLY" /* 20 0x14 */ |
| 381 | }; |
| 382 | |
| 383 | const char * |
| 384 | nto_extra_thread_info (struct target_ops *self, struct thread_info *ti) |
| 385 | { |
| 386 | if (ti != NULL && ti->priv != NULL) |
| 387 | { |
| 388 | nto_thread_info *priv = get_nto_thread_info (ti); |
| 389 | |
| 390 | if (priv->state < ARRAY_SIZE (nto_thread_state_str)) |
| 391 | return nto_thread_state_str [priv->state]; |
| 392 | } |
| 393 | return ""; |
| 394 | } |
| 395 | |
| 396 | void |
| 397 | nto_initialize_signals (void) |
| 398 | { |
| 399 | /* We use SIG45 for pulses, or something, so nostop, noprint |
| 400 | and pass them. */ |
| 401 | signal_stop_update (gdb_signal_from_name ("SIG45"), 0); |
| 402 | signal_print_update (gdb_signal_from_name ("SIG45"), 0); |
| 403 | signal_pass_update (gdb_signal_from_name ("SIG45"), 1); |
| 404 | |
| 405 | /* By default we don't want to stop on these two, but we do want to pass. */ |
| 406 | #if defined(SIGSELECT) |
| 407 | signal_stop_update (SIGSELECT, 0); |
| 408 | signal_print_update (SIGSELECT, 0); |
| 409 | signal_pass_update (SIGSELECT, 1); |
| 410 | #endif |
| 411 | |
| 412 | #if defined(SIGPHOTON) |
| 413 | signal_stop_update (SIGPHOTON, 0); |
| 414 | signal_print_update (SIGPHOTON, 0); |
| 415 | signal_pass_update (SIGPHOTON, 1); |
| 416 | #endif |
| 417 | } |
| 418 | |
| 419 | /* Read AUXV from initial_stack. */ |
| 420 | LONGEST |
| 421 | nto_read_auxv_from_initial_stack (CORE_ADDR initial_stack, gdb_byte *readbuf, |
| 422 | LONGEST len, size_t sizeof_auxv_t) |
| 423 | { |
| 424 | gdb_byte targ32[4]; /* For 32 bit target values. */ |
| 425 | gdb_byte targ64[8]; /* For 64 bit target values. */ |
| 426 | CORE_ADDR data_ofs = 0; |
| 427 | ULONGEST anint; |
| 428 | LONGEST len_read = 0; |
| 429 | gdb_byte *buff; |
| 430 | enum bfd_endian byte_order; |
| 431 | int ptr_size; |
| 432 | |
| 433 | if (sizeof_auxv_t == 16) |
| 434 | ptr_size = 8; |
| 435 | else |
| 436 | ptr_size = 4; |
| 437 | |
| 438 | /* Skip over argc, argv and envp... Comment from ldd.c: |
| 439 | |
| 440 | The startup frame is set-up so that we have: |
| 441 | auxv |
| 442 | NULL |
| 443 | ... |
| 444 | envp2 |
| 445 | envp1 <----- void *frame + (argc + 2) * sizeof(char *) |
| 446 | NULL |
| 447 | ... |
| 448 | argv2 |
| 449 | argv1 |
| 450 | argc <------ void * frame |
| 451 | |
| 452 | On entry to ldd, frame gives the address of argc on the stack. */ |
| 453 | /* Read argc. 4 bytes on both 64 and 32 bit arches and luckily little |
| 454 | * endian. So we just read first 4 bytes. */ |
| 455 | if (target_read_memory (initial_stack + data_ofs, targ32, 4) != 0) |
| 456 | return 0; |
| 457 | |
| 458 | byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 459 | |
| 460 | anint = extract_unsigned_integer (targ32, sizeof (targ32), byte_order); |
| 461 | |
| 462 | /* Size of pointer is assumed to be 4 bytes (32 bit arch.) */ |
| 463 | data_ofs += (anint + 2) * ptr_size; /* + 2 comes from argc itself and |
| 464 | NULL terminating pointer in |
| 465 | argv. */ |
| 466 | |
| 467 | /* Now loop over env table: */ |
| 468 | anint = 0; |
| 469 | while (target_read_memory (initial_stack + data_ofs, targ64, ptr_size) |
| 470 | == 0) |
| 471 | { |
| 472 | if (extract_unsigned_integer (targ64, ptr_size, byte_order) == 0) |
| 473 | anint = 1; /* Keep looping until non-null entry is found. */ |
| 474 | else if (anint) |
| 475 | break; |
| 476 | data_ofs += ptr_size; |
| 477 | } |
| 478 | initial_stack += data_ofs; |
| 479 | |
| 480 | memset (readbuf, 0, len); |
| 481 | buff = readbuf; |
| 482 | while (len_read <= len-sizeof_auxv_t) |
| 483 | { |
| 484 | if (target_read_memory (initial_stack + len_read, buff, sizeof_auxv_t) |
| 485 | == 0) |
| 486 | { |
| 487 | /* Both 32 and 64 bit structures have int as the first field. */ |
| 488 | const ULONGEST a_type |
| 489 | = extract_unsigned_integer (buff, sizeof (targ32), byte_order); |
| 490 | |
| 491 | if (a_type == AT_NULL) |
| 492 | break; |
| 493 | buff += sizeof_auxv_t; |
| 494 | len_read += sizeof_auxv_t; |
| 495 | } |
| 496 | else |
| 497 | break; |
| 498 | } |
| 499 | return len_read; |
| 500 | } |
| 501 | |
| 502 | /* Return nto_inferior_data for the given INFERIOR. If not yet created, |
| 503 | construct it. */ |
| 504 | |
| 505 | struct nto_inferior_data * |
| 506 | nto_inferior_data (struct inferior *const inferior) |
| 507 | { |
| 508 | struct inferior *const inf = inferior ? inferior : current_inferior (); |
| 509 | struct nto_inferior_data *inf_data; |
| 510 | |
| 511 | gdb_assert (inf != NULL); |
| 512 | |
| 513 | inf_data = nto_inferior_data_reg.get (inf); |
| 514 | if (inf_data == NULL) |
| 515 | inf_data = nto_inferior_data_reg.emplace (inf); |
| 516 | |
| 517 | return inf_data; |
| 518 | } |