gdb/nto-tdep.c

   1 /* nto-tdep.c - general QNX Neutrino target functionality.
   2
   3    Copyright (C) 2003-2018 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
  36 #define QNX_NOTE_NAME   "QNX"
  37 #define QNX_INFO_SECT_NAME "QNX_info"
  38
  39 #ifdef __CYGWIN__
  40 #include <sys/cygwin.h>
  41 #endif
  42
  43 #ifdef __CYGWIN__
  44 static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";
  45 #elif defined(__sun__) || defined(linux)
  46 static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";
  47 #else
  48 static char default_nto_target[] = "";
  49 #endif
  50
  51 struct nto_target_ops current_nto_target;
  52
  53 static const struct inferior_data *nto_inferior_data_reg;
  54
  55 static char *
  56 nto_target (void)
  57 {
  58   char *p = getenv ("QNX_TARGET");
  59
  60 #ifdef __CYGWIN__
  61   static char buf[PATH_MAX];
  62   if (p)
  63     cygwin_conv_path (CCP_WIN_A_TO_POSIX, p, buf, PATH_MAX);
  64   else
  65     cygwin_conv_path (CCP_WIN_A_TO_POSIX, default_nto_target, buf, PATH_MAX);
  66   return buf;
  67 #else
  68   return p ? p : default_nto_target;
  69 #endif
  70 }
  71
  72 /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
  73    CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
  74 int
  75 nto_map_arch_to_cputype (const char *arch)
  76 {
  77   if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
  78     return CPUTYPE_X86;
  79   if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))
  80     return CPUTYPE_PPC;
  81   if (!strcmp (arch, "mips"))
  82     return CPUTYPE_MIPS;
  83   if (!strcmp (arch, "arm"))
  84     return CPUTYPE_ARM;
  85   if (!strcmp (arch, "sh"))
  86     return CPUTYPE_SH;
  87   return CPUTYPE_UNKNOWN;
  88 }
  89
  90 int
  91 nto_find_and_open_solib (const char *solib, unsigned o_flags,
  92                          char **temp_pathname)
  93 {
  94   char *buf, *arch_path, *nto_root;
  95   const char *endian;
  96   const char *base;
  97   const char *arch;
  98   int arch_len, len, ret;
  99 #define PATH_FMT \
 100   "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"
 101
 102   nto_root = nto_target ();
 103   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
 104     {
 105       arch = "x86";
 106       endian = "";
 107     }
 108   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 109                    "rs6000") == 0
 110            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 111                    "powerpc") == 0)
 112     {
 113       arch = "ppc";
 114       endian = "be";
 115     }
 116   else
 117     {
 118       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
 119       endian = gdbarch_byte_order (target_gdbarch ())
 120                == BFD_ENDIAN_BIG ? "be" : "le";
 121     }
 122
 123   /* In case nto_root is short, add strlen(solib)
 124      so we can reuse arch_path below.  */
 125
 126   arch_len = (strlen (nto_root) + strlen (arch) + strlen (endian) + 2
 127               + strlen (solib));
 128   arch_path = (char *) alloca (arch_len);
 129   xsnprintf (arch_path, arch_len, "%s/%s%s", nto_root, arch, endian);
 130
 131   len = strlen (PATH_FMT) + strlen (arch_path) * 5 + 1;
 132   buf = (char *) alloca (len);
 133   xsnprintf (buf, len, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
 134              arch_path);
 135
 136   base = lbasename (solib);
 137   ret = openp (buf, OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, base, o_flags,
 138                temp_pathname);
 139   if (ret < 0 && base != solib)
 140     {
 141       xsnprintf (arch_path, arch_len, "/%s", solib);
 142       ret = open (arch_path, o_flags, 0);
 143       if (temp_pathname)
 144         {
 145           if (ret >= 0)
 146             *temp_pathname = gdb_realpath (arch_path).release ();
 147           else
 148             *temp_pathname = NULL;
 149         }
 150     }
 151   return ret;
 152 }
 153
 154 void
 155 nto_init_solib_absolute_prefix (void)
 156 {
 157   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 158   char *nto_root;
 159   const char *endian;
 160   const char *arch;
 161
 162   nto_root = nto_target ();
 163   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
 164     {
 165       arch = "x86";
 166       endian = "";
 167     }
 168   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 169                    "rs6000") == 0
 170            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 171                    "powerpc") == 0)
 172     {
 173       arch = "ppc";
 174       endian = "be";
 175     }
 176   else
 177     {
 178       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
 179       endian = gdbarch_byte_order (target_gdbarch ())
 180                == BFD_ENDIAN_BIG ? "be" : "le";
 181     }
 182
 183   xsnprintf (arch_path, sizeof (arch_path), "%s/%s%s", nto_root, arch, endian);
 184
 185   xsnprintf (buf, sizeof (buf), "set solib-absolute-prefix %s", arch_path);
 186   execute_command (buf, 0);
 187 }
 188
 189 char **
 190 nto_parse_redirection (char *pargv[], const char **pin, const char **pout,
 191                        const char **perr)
 192 {
 193   char **argv;
 194   const char *in, *out, *err, *p;
 195   int argc, i, n;
 196
 197   for (n = 0; pargv[n]; n++);
 198   if (n == 0)
 199     return NULL;
 200   in = "";
 201   out = "";
 202   err = "";
 203
 204   argv = XCNEWVEC (char *, n + 1);
 205   argc = n;
 206   for (i = 0, n = 0; n < argc; n++)
 207     {
 208       p = pargv[n];
 209       if (*p == '>')
 210         {
 211           p++;
 212           if (*p)
 213             out = p;
 214           else
 215             out = pargv[++n];
 216         }
 217       else if (*p == '<')
 218         {
 219           p++;
 220           if (*p)
 221             in = p;
 222           else
 223             in = pargv[++n];
 224         }
 225       else if (*p++ == '2' && *p++ == '>')
 226         {
 227           if (*p == '&' && *(p + 1) == '1')
 228             err = out;
 229           else if (*p)
 230             err = p;
 231           else
 232             err = pargv[++n];
 233         }
 234       else
 235         argv[i++] = pargv[n];
 236     }
 237   *pin = in;
 238   *pout = out;
 239   *perr = err;
 240   return argv;
 241 }
 242
 243 static CORE_ADDR
 244 lm_addr (struct so_list *so)
 245 {
 246   lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info;
 247
 248   return li->l_addr;
 249 }
 250
 251 static CORE_ADDR
 252 nto_truncate_ptr (CORE_ADDR addr)
 253 {
 254   if (gdbarch_ptr_bit (target_gdbarch ()) == sizeof (CORE_ADDR) * 8)
 255     /* We don't need to truncate anything, and the bit twiddling below
 256        will fail due to overflow problems.  */
 257     return addr;
 258   else
 259     return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch ())) - 1);
 260 }
 261
 262 static Elf_Internal_Phdr *
 263 find_load_phdr (bfd *abfd)
 264 {
 265   Elf_Internal_Phdr *phdr;
 266   unsigned int i;
 267
 268   if (!elf_tdata (abfd))
 269     return NULL;
 270
 271   phdr = elf_tdata (abfd)->phdr;
 272   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 273     {
 274       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 275         return phdr;
 276     }
 277   return NULL;
 278 }
 279
 280 void
 281 nto_relocate_section_addresses (struct so_list *so, struct target_section *sec)
 282 {
 283   /* Neutrino treats the l_addr base address field in link.h as different than
 284      the base address in the System V ABI and so the offset needs to be
 285      calculated and applied to relocations.  */
 286   Elf_Internal_Phdr *phdr = find_load_phdr (sec->the_bfd_section->owner);
 287   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 288
 289   sec->addr = nto_truncate_ptr (sec->addr + lm_addr (so) - vaddr);
 290   sec->endaddr = nto_truncate_ptr (sec->endaddr + lm_addr (so) - vaddr);
 291 }
 292
 293 /* This is cheating a bit because our linker code is in libc.so.  If we
 294    ever implement lazy linking, this may need to be re-examined.  */
 295 int
 296 nto_in_dynsym_resolve_code (CORE_ADDR pc)
 297 {
 298   if (in_plt_section (pc))
 299     return 1;
 300   return 0;
 301 }
 302
 303 void
 304 nto_dummy_supply_regset (struct regcache *regcache, char *regs)
 305 {
 306   /* Do nothing.  */
 307 }
 308
 309 static void
 310 nto_sniff_abi_note_section (bfd *abfd, asection *sect, void *obj)
 311 {
 312   const char *sectname;
 313   unsigned int sectsize;
 314   /* Buffer holding the section contents.  */
 315   char *note;
 316   unsigned int namelen;
 317   const char *name;
 318   const unsigned sizeof_Elf_Nhdr = 12;
 319
 320   sectname = bfd_get_section_name (abfd, sect);
 321   sectsize = bfd_section_size (abfd, sect);
 322
 323   if (sectsize > 128)
 324     sectsize = 128;
 325
 326   if (sectname != NULL && strstr (sectname, QNX_INFO_SECT_NAME) != NULL)
 327     *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO;
 328   else if (sectname != NULL && strstr (sectname, "note") != NULL
 329            && sectsize > sizeof_Elf_Nhdr)
 330     {
 331       note = XNEWVEC (char, sectsize);
 332       bfd_get_section_contents (abfd, sect, note, 0, sectsize);
 333       namelen = (unsigned int) bfd_h_get_32 (abfd, note);
 334       name = note + sizeof_Elf_Nhdr;
 335       if (sectsize >= namelen + sizeof_Elf_Nhdr
 336           && namelen == sizeof (QNX_NOTE_NAME)
 337           && 0 == strcmp (name, QNX_NOTE_NAME))
 338         *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO;
 339
 340       XDELETEVEC (note);
 341     }
 342 }
 343
 344 enum gdb_osabi
 345 nto_elf_osabi_sniffer (bfd *abfd)
 346 {
 347   enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
 348
 349   bfd_map_over_sections (abfd,
 350                          nto_sniff_abi_note_section,
 351                          &osabi);
 352
 353   return osabi;
 354 }
 355
 356 static const char *nto_thread_state_str[] =
 357 {
 358   "DEAD",               /* 0  0x00 */
 359   "RUNNING",    /* 1  0x01 */
 360   "READY",      /* 2  0x02 */
 361   "STOPPED",    /* 3  0x03 */
 362   "SEND",               /* 4  0x04 */
 363   "RECEIVE",    /* 5  0x05 */
 364   "REPLY",      /* 6  0x06 */
 365   "STACK",      /* 7  0x07 */
 366   "WAITTHREAD", /* 8  0x08 */
 367   "WAITPAGE",   /* 9  0x09 */
 368   "SIGSUSPEND", /* 10 0x0a */
 369   "SIGWAITINFO",        /* 11 0x0b */
 370   "NANOSLEEP",  /* 12 0x0c */
 371   "MUTEX",      /* 13 0x0d */
 372   "CONDVAR",    /* 14 0x0e */
 373   "JOIN",               /* 15 0x0f */
 374   "INTR",               /* 16 0x10 */
 375   "SEM",                /* 17 0x11 */
 376   "WAITCTX",    /* 18 0x12 */
 377   "NET_SEND",   /* 19 0x13 */
 378   "NET_REPLY"   /* 20 0x14 */
 379 };
 380
 381 const char *
 382 nto_extra_thread_info (struct target_ops *self, struct thread_info *ti)
 383 {
 384   if (ti != NULL && ti->priv != NULL)
 385     {
 386       nto_thread_info *priv = get_nto_thread_info (ti);
 387
 388       if (priv->state < ARRAY_SIZE (nto_thread_state_str))
 389         return nto_thread_state_str [priv->state];
 390     }
 391   return "";
 392 }
 393
 394 void
 395 nto_initialize_signals (void)
 396 {
 397   /* We use SIG45 for pulses, or something, so nostop, noprint
 398      and pass them.  */
 399   signal_stop_update (gdb_signal_from_name ("SIG45"), 0);
 400   signal_print_update (gdb_signal_from_name ("SIG45"), 0);
 401   signal_pass_update (gdb_signal_from_name ("SIG45"), 1);
 402
 403   /* By default we don't want to stop on these two, but we do want to pass.  */
 404 #if defined(SIGSELECT)
 405   signal_stop_update (SIGSELECT, 0);
 406   signal_print_update (SIGSELECT, 0);
 407   signal_pass_update (SIGSELECT, 1);
 408 #endif
 409
 410 #if defined(SIGPHOTON)
 411   signal_stop_update (SIGPHOTON, 0);
 412   signal_print_update (SIGPHOTON, 0);
 413   signal_pass_update (SIGPHOTON, 1);
 414 #endif
 415 }
 416
 417 /* Read AUXV from initial_stack.  */
 418 LONGEST
 419 nto_read_auxv_from_initial_stack (CORE_ADDR initial_stack, gdb_byte *readbuf,
 420                                   LONGEST len, size_t sizeof_auxv_t)
 421 {
 422   gdb_byte targ32[4]; /* For 32 bit target values.  */
 423   gdb_byte targ64[8]; /* For 64 bit target values.  */
 424   CORE_ADDR data_ofs = 0;
 425   ULONGEST anint;
 426   LONGEST len_read = 0;
 427   gdb_byte *buff;
 428   enum bfd_endian byte_order;
 429   int ptr_size;
 430
 431   if (sizeof_auxv_t == 16)
 432     ptr_size = 8;
 433   else
 434     ptr_size = 4;
 435
 436   /* Skip over argc, argv and envp... Comment from ldd.c:
 437
 438      The startup frame is set-up so that we have:
 439      auxv
 440      NULL
 441      ...
 442      envp2
 443      envp1 <----- void *frame + (argc + 2) * sizeof(char *)
 444      NULL
 445      ...
 446      argv2
 447      argv1
 448      argc  <------ void * frame
 449
 450      On entry to ldd, frame gives the address of argc on the stack.  */
 451   /* Read argc. 4 bytes on both 64 and 32 bit arches and luckily little
 452    * endian. So we just read first 4 bytes.  */
 453   if (target_read_memory (initial_stack + data_ofs, targ32, 4) != 0)
 454     return 0;
 455
 456   byte_order = gdbarch_byte_order (target_gdbarch ());
 457
 458   anint = extract_unsigned_integer (targ32, sizeof (targ32), byte_order);
 459
 460   /* Size of pointer is assumed to be 4 bytes (32 bit arch.) */
 461   data_ofs += (anint + 2) * ptr_size; /* + 2 comes from argc itself and
 462                                                 NULL terminating pointer in
 463                                                 argv.  */
 464
 465   /* Now loop over env table:  */
 466   anint = 0;
 467   while (target_read_memory (initial_stack + data_ofs, targ64, ptr_size)
 468          == 0)
 469     {
 470       if (extract_unsigned_integer (targ64, ptr_size, byte_order) == 0)
 471         anint = 1; /* Keep looping until non-null entry is found.  */
 472       else if (anint)
 473         break;
 474       data_ofs += ptr_size;
 475     }
 476   initial_stack += data_ofs;
 477
 478   memset (readbuf, 0, len);
 479   buff = readbuf;
 480   while (len_read <= len-sizeof_auxv_t)
 481     {
 482       if (target_read_memory (initial_stack + len_read, buff, sizeof_auxv_t)
 483           == 0)
 484         {
 485           /* Both 32 and 64 bit structures have int as the first field.  */
 486           const ULONGEST a_type
 487             = extract_unsigned_integer (buff, sizeof (targ32), byte_order);
 488
 489           if (a_type == AT_NULL)
 490             break;
 491           buff += sizeof_auxv_t;
 492           len_read += sizeof_auxv_t;
 493         }
 494       else
 495         break;
 496     }
 497   return len_read;
 498 }
 499
 500 /* Allocate new nto_inferior_data object.  */
 501
 502 static struct nto_inferior_data *
 503 nto_new_inferior_data (void)
 504 {
 505   struct nto_inferior_data *const inf_data
 506     = XCNEW (struct nto_inferior_data);
 507
 508   return inf_data;
 509 }
 510
 511 /* Free inferior data.  */
 512
 513 static void
 514 nto_inferior_data_cleanup (struct inferior *const inf, void *const dat)
 515 {
 516   xfree (dat);
 517 }
 518
 519 /* Return nto_inferior_data for the given INFERIOR.  If not yet created,
 520    construct it.  */
 521
 522 struct nto_inferior_data *
 523 nto_inferior_data (struct inferior *const inferior)
 524 {
 525   struct inferior *const inf = inferior ? inferior : current_inferior ();
 526   struct nto_inferior_data *inf_data;
 527
 528   gdb_assert (inf != NULL);
 529
 530   inf_data
 531     = (struct nto_inferior_data *) inferior_data (inf, nto_inferior_data_reg);
 532   if (inf_data == NULL)
 533     {
 534       set_inferior_data (inf, nto_inferior_data_reg,
 535                          (inf_data = nto_new_inferior_data ()));
 536     }
 537
 538   return inf_data;
 539 }
 540
 541 void
 542 _initialize_nto_tdep (void)
 543 {
 544   nto_inferior_data_reg
 545     = register_inferior_data_with_cleanup (NULL, nto_inferior_data_cleanup);
 546 }