gdb/nto-tdep.c

   1 /* nto-tdep.c - general QNX Neutrino target functionality.
   2
   3    Copyright (C) 2003-2021 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 * const 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 }