gdb/nto-tdep.c

   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 "common/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_data *nto_inferior_data_reg;
  55
  56 static char *
  57 nto_target (void)
  58 {
  59   char *p = getenv ("QNX_TARGET");
  60
  61 #ifdef __CYGWIN__
  62   static char buf[PATH_MAX];
  63   if (p)
  64     cygwin_conv_path (CCP_WIN_A_TO_POSIX, p, buf, PATH_MAX);
  65   else
  66     cygwin_conv_path (CCP_WIN_A_TO_POSIX, default_nto_target, buf, PATH_MAX);
  67   return buf;
  68 #else
  69   return p ? p : default_nto_target;
  70 #endif
  71 }
  72
  73 /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
  74    CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
  75 int
  76 nto_map_arch_to_cputype (const char *arch)
  77 {
  78   if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
  79     return CPUTYPE_X86;
  80   if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))
  81     return CPUTYPE_PPC;
  82   if (!strcmp (arch, "mips"))
  83     return CPUTYPE_MIPS;
  84   if (!strcmp (arch, "arm"))
  85     return CPUTYPE_ARM;
  86   if (!strcmp (arch, "sh"))
  87     return CPUTYPE_SH;
  88   return CPUTYPE_UNKNOWN;
  89 }
  90
  91 int
  92 nto_find_and_open_solib (const char *solib, unsigned o_flags,
  93                          gdb::unique_xmalloc_ptr<char> *temp_pathname)
  94 {
  95   char *buf, *arch_path, *nto_root;
  96   const char *endian;
  97   const char *base;
  98   const char *arch;
  99   int arch_len, len, ret;
 100 #define PATH_FMT \
 101   "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"
 102
 103   nto_root = nto_target ();
 104   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
 105     {
 106       arch = "x86";
 107       endian = "";
 108     }
 109   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 110                    "rs6000") == 0
 111            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 112                    "powerpc") == 0)
 113     {
 114       arch = "ppc";
 115       endian = "be";
 116     }
 117   else
 118     {
 119       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
 120       endian = gdbarch_byte_order (target_gdbarch ())
 121                == BFD_ENDIAN_BIG ? "be" : "le";
 122     }
 123
 124   /* In case nto_root is short, add strlen(solib)
 125      so we can reuse arch_path below.  */
 126
 127   arch_len = (strlen (nto_root) + strlen (arch) + strlen (endian) + 2
 128               + strlen (solib));
 129   arch_path = (char *) alloca (arch_len);
 130   xsnprintf (arch_path, arch_len, "%s/%s%s", nto_root, arch, endian);
 131
 132   len = strlen (PATH_FMT) + strlen (arch_path) * 5 + 1;
 133   buf = (char *) alloca (len);
 134   xsnprintf (buf, len, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
 135              arch_path);
 136
 137   base = lbasename (solib);
 138   ret = openp (buf, OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, base, o_flags,
 139                temp_pathname);
 140   if (ret < 0 && base != solib)
 141     {
 142       xsnprintf (arch_path, arch_len, "/%s", solib);
 143       ret = open (arch_path, o_flags, 0);
 144       if (temp_pathname)
 145         {
 146           if (ret >= 0)
 147             *temp_pathname = gdb_realpath (arch_path);
 148           else
 149             temp_pathname->reset (NULL);
 150         }
 151     }
 152   return ret;
 153 }
 154
 155 void
 156 nto_init_solib_absolute_prefix (void)
 157 {
 158   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 159   char *nto_root;
 160   const char *endian;
 161   const char *arch;
 162
 163   nto_root = nto_target ();
 164   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
 165     {
 166       arch = "x86";
 167       endian = "";
 168     }
 169   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 170                    "rs6000") == 0
 171            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 172                    "powerpc") == 0)
 173     {
 174       arch = "ppc";
 175       endian = "be";
 176     }
 177   else
 178     {
 179       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
 180       endian = gdbarch_byte_order (target_gdbarch ())
 181                == BFD_ENDIAN_BIG ? "be" : "le";
 182     }
 183
 184   xsnprintf (arch_path, sizeof (arch_path), "%s/%s%s", nto_root, arch, endian);
 185
 186   xsnprintf (buf, sizeof (buf), "set solib-absolute-prefix %s", arch_path);
 187   execute_command (buf, 0);
 188 }
 189
 190 char **
 191 nto_parse_redirection (char *pargv[], const char **pin, const char **pout,
 192                        const char **perr)
 193 {
 194   char **argv;
 195   const char *in, *out, *err, *p;
 196   int argc, i, n;
 197
 198   for (n = 0; pargv[n]; n++);
 199   if (n == 0)
 200     return NULL;
 201   in = "";
 202   out = "";
 203   err = "";
 204
 205   argv = XCNEWVEC (char *, n + 1);
 206   argc = n;
 207   for (i = 0, n = 0; n < argc; n++)
 208     {
 209       p = pargv[n];
 210       if (*p == '>')
 211         {
 212           p++;
 213           if (*p)
 214             out = p;
 215           else
 216             out = pargv[++n];
 217         }
 218       else if (*p == '<')
 219         {
 220           p++;
 221           if (*p)
 222             in = p;
 223           else
 224             in = pargv[++n];
 225         }
 226       else if (*p++ == '2' && *p++ == '>')
 227         {
 228           if (*p == '&' && *(p + 1) == '1')
 229             err = out;
 230           else if (*p)
 231             err = p;
 232           else
 233             err = pargv[++n];
 234         }
 235       else
 236         argv[i++] = pargv[n];
 237     }
 238   *pin = in;
 239   *pout = out;
 240   *perr = err;
 241   return argv;
 242 }
 243
 244 static CORE_ADDR
 245 lm_addr (struct so_list *so)
 246 {
 247   lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info;
 248
 249   return li->l_addr;
 250 }
 251
 252 static CORE_ADDR
 253 nto_truncate_ptr (CORE_ADDR addr)
 254 {
 255   if (gdbarch_ptr_bit (target_gdbarch ()) == sizeof (CORE_ADDR) * 8)
 256     /* We don't need to truncate anything, and the bit twiddling below
 257        will fail due to overflow problems.  */
 258     return addr;
 259   else
 260     return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch ())) - 1);
 261 }
 262
 263 static Elf_Internal_Phdr *
 264 find_load_phdr (bfd *abfd)
 265 {
 266   Elf_Internal_Phdr *phdr;
 267   unsigned int i;
 268
 269   if (!elf_tdata (abfd))
 270     return NULL;
 271
 272   phdr = elf_tdata (abfd)->phdr;
 273   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 274     {
 275       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 276         return phdr;
 277     }
 278   return NULL;
 279 }
 280
 281 void
 282 nto_relocate_section_addresses (struct so_list *so, struct target_section *sec)
 283 {
 284   /* Neutrino treats the l_addr base address field in link.h as different than
 285      the base address in the System V ABI and so the offset needs to be
 286      calculated and applied to relocations.  */
 287   Elf_Internal_Phdr *phdr = find_load_phdr (sec->the_bfd_section->owner);
 288   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 289
 290   sec->addr = nto_truncate_ptr (sec->addr + lm_addr (so) - vaddr);
 291   sec->endaddr = nto_truncate_ptr (sec->endaddr + lm_addr (so) - vaddr);
 292 }
 293
 294 /* This is cheating a bit because our linker code is in libc.so.  If we
 295    ever implement lazy linking, this may need to be re-examined.  */
 296 int
 297 nto_in_dynsym_resolve_code (CORE_ADDR pc)
 298 {
 299   if (in_plt_section (pc))
 300     return 1;
 301   return 0;
 302 }
 303
 304 void
 305 nto_dummy_supply_regset (struct regcache *regcache, char *regs)
 306 {
 307   /* Do nothing.  */
 308 }
 309
 310 static void
 311 nto_sniff_abi_note_section (bfd *abfd, asection *sect, void *obj)
 312 {
 313   const char *sectname;
 314   unsigned int sectsize;
 315   /* Buffer holding the section contents.  */
 316   char *note;
 317   unsigned int namelen;
 318   const char *name;
 319   const unsigned sizeof_Elf_Nhdr = 12;
 320
 321   sectname = bfd_get_section_name (abfd, sect);
 322   sectsize = bfd_section_size (abfd, sect);
 323
 324   if (sectsize > 128)
 325     sectsize = 128;
 326
 327   if (sectname != NULL && strstr (sectname, QNX_INFO_SECT_NAME) != NULL)
 328     *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO;
 329   else if (sectname != NULL && strstr (sectname, "note") != NULL
 330            && sectsize > sizeof_Elf_Nhdr)
 331     {
 332       note = XNEWVEC (char, sectsize);
 333       bfd_get_section_contents (abfd, sect, note, 0, sectsize);
 334       namelen = (unsigned int) bfd_h_get_32 (abfd, note);
 335       name = note + sizeof_Elf_Nhdr;
 336       if (sectsize >= namelen + sizeof_Elf_Nhdr
 337           && namelen == sizeof (QNX_NOTE_NAME)
 338           && 0 == strcmp (name, QNX_NOTE_NAME))
 339         *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO;
 340
 341       XDELETEVEC (note);
 342     }
 343 }
 344
 345 enum gdb_osabi
 346 nto_elf_osabi_sniffer (bfd *abfd)
 347 {
 348   enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
 349
 350   bfd_map_over_sections (abfd,
 351                          nto_sniff_abi_note_section,
 352                          &osabi);
 353
 354   return osabi;
 355 }
 356
 357 static const char *nto_thread_state_str[] =
 358 {
 359   "DEAD",               /* 0  0x00 */
 360   "RUNNING",    /* 1  0x01 */
 361   "READY",      /* 2  0x02 */
 362   "STOPPED",    /* 3  0x03 */
 363   "SEND",               /* 4  0x04 */
 364   "RECEIVE",    /* 5  0x05 */
 365   "REPLY",      /* 6  0x06 */
 366   "STACK",      /* 7  0x07 */
 367   "WAITTHREAD", /* 8  0x08 */
 368   "WAITPAGE",   /* 9  0x09 */
 369   "SIGSUSPEND", /* 10 0x0a */
 370   "SIGWAITINFO",        /* 11 0x0b */
 371   "NANOSLEEP",  /* 12 0x0c */
 372   "MUTEX",      /* 13 0x0d */
 373   "CONDVAR",    /* 14 0x0e */
 374   "JOIN",               /* 15 0x0f */
 375   "INTR",               /* 16 0x10 */
 376   "SEM",                /* 17 0x11 */
 377   "WAITCTX",    /* 18 0x12 */
 378   "NET_SEND",   /* 19 0x13 */
 379   "NET_REPLY"   /* 20 0x14 */
 380 };
 381
 382 const char *
 383 nto_extra_thread_info (struct target_ops *self, struct thread_info *ti)
 384 {
 385   if (ti != NULL && ti->priv != NULL)
 386     {
 387       nto_thread_info *priv = get_nto_thread_info (ti);
 388
 389       if (priv->state < ARRAY_SIZE (nto_thread_state_str))
 390         return nto_thread_state_str [priv->state];
 391     }
 392   return "";
 393 }
 394
 395 void
 396 nto_initialize_signals (void)
 397 {
 398   /* We use SIG45 for pulses, or something, so nostop, noprint
 399      and pass them.  */
 400   signal_stop_update (gdb_signal_from_name ("SIG45"), 0);
 401   signal_print_update (gdb_signal_from_name ("SIG45"), 0);
 402   signal_pass_update (gdb_signal_from_name ("SIG45"), 1);
 403
 404   /* By default we don't want to stop on these two, but we do want to pass.  */
 405 #if defined(SIGSELECT)
 406   signal_stop_update (SIGSELECT, 0);
 407   signal_print_update (SIGSELECT, 0);
 408   signal_pass_update (SIGSELECT, 1);
 409 #endif
 410
 411 #if defined(SIGPHOTON)
 412   signal_stop_update (SIGPHOTON, 0);
 413   signal_print_update (SIGPHOTON, 0);
 414   signal_pass_update (SIGPHOTON, 1);
 415 #endif
 416 }
 417
 418 /* Read AUXV from initial_stack.  */
 419 LONGEST
 420 nto_read_auxv_from_initial_stack (CORE_ADDR initial_stack, gdb_byte *readbuf,
 421                                   LONGEST len, size_t sizeof_auxv_t)
 422 {
 423   gdb_byte targ32[4]; /* For 32 bit target values.  */
 424   gdb_byte targ64[8]; /* For 64 bit target values.  */
 425   CORE_ADDR data_ofs = 0;
 426   ULONGEST anint;
 427   LONGEST len_read = 0;
 428   gdb_byte *buff;
 429   enum bfd_endian byte_order;
 430   int ptr_size;
 431
 432   if (sizeof_auxv_t == 16)
 433     ptr_size = 8;
 434   else
 435     ptr_size = 4;
 436
 437   /* Skip over argc, argv and envp... Comment from ldd.c:
 438
 439      The startup frame is set-up so that we have:
 440      auxv
 441      NULL
 442      ...
 443      envp2
 444      envp1 <----- void *frame + (argc + 2) * sizeof(char *)
 445      NULL
 446      ...
 447      argv2
 448      argv1
 449      argc  <------ void * frame
 450
 451      On entry to ldd, frame gives the address of argc on the stack.  */
 452   /* Read argc. 4 bytes on both 64 and 32 bit arches and luckily little
 453    * endian. So we just read first 4 bytes.  */
 454   if (target_read_memory (initial_stack + data_ofs, targ32, 4) != 0)
 455     return 0;
 456
 457   byte_order = gdbarch_byte_order (target_gdbarch ());
 458
 459   anint = extract_unsigned_integer (targ32, sizeof (targ32), byte_order);
 460
 461   /* Size of pointer is assumed to be 4 bytes (32 bit arch.) */
 462   data_ofs += (anint + 2) * ptr_size; /* + 2 comes from argc itself and
 463                                                 NULL terminating pointer in
 464                                                 argv.  */
 465
 466   /* Now loop over env table:  */
 467   anint = 0;
 468   while (target_read_memory (initial_stack + data_ofs, targ64, ptr_size)
 469          == 0)
 470     {
 471       if (extract_unsigned_integer (targ64, ptr_size, byte_order) == 0)
 472         anint = 1; /* Keep looping until non-null entry is found.  */
 473       else if (anint)
 474         break;
 475       data_ofs += ptr_size;
 476     }
 477   initial_stack += data_ofs;
 478
 479   memset (readbuf, 0, len);
 480   buff = readbuf;
 481   while (len_read <= len-sizeof_auxv_t)
 482     {
 483       if (target_read_memory (initial_stack + len_read, buff, sizeof_auxv_t)
 484           == 0)
 485         {
 486           /* Both 32 and 64 bit structures have int as the first field.  */
 487           const ULONGEST a_type
 488             = extract_unsigned_integer (buff, sizeof (targ32), byte_order);
 489
 490           if (a_type == AT_NULL)
 491             break;
 492           buff += sizeof_auxv_t;
 493           len_read += sizeof_auxv_t;
 494         }
 495       else
 496         break;
 497     }
 498   return len_read;
 499 }
 500
 501 /* Allocate new nto_inferior_data object.  */
 502
 503 static struct nto_inferior_data *
 504 nto_new_inferior_data (void)
 505 {
 506   struct nto_inferior_data *const inf_data
 507     = XCNEW (struct nto_inferior_data);
 508
 509   return inf_data;
 510 }
 511
 512 /* Free inferior data.  */
 513
 514 static void
 515 nto_inferior_data_cleanup (struct inferior *const inf, void *const dat)
 516 {
 517   xfree (dat);
 518 }
 519
 520 /* Return nto_inferior_data for the given INFERIOR.  If not yet created,
 521    construct it.  */
 522
 523 struct nto_inferior_data *
 524 nto_inferior_data (struct inferior *const inferior)
 525 {
 526   struct inferior *const inf = inferior ? inferior : current_inferior ();
 527   struct nto_inferior_data *inf_data;
 528
 529   gdb_assert (inf != NULL);
 530
 531   inf_data
 532     = (struct nto_inferior_data *) inferior_data (inf, nto_inferior_data_reg);
 533   if (inf_data == NULL)
 534     {
 535       set_inferior_data (inf, nto_inferior_data_reg,
 536                          (inf_data = nto_new_inferior_data ()));
 537     }
 538
 539   return inf_data;
 540 }
 541
 542 void
 543 _initialize_nto_tdep (void)
 544 {
 545   nto_inferior_data_reg
 546     = register_inferior_data_with_cleanup (NULL, nto_inferior_data_cleanup);
 547 }