gdb/nto-tdep.c

   1 /* nto-tdep.c - general QNX Neutrino target functionality.
   2
   3    Copyright (C) 2003-2023 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 registry<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   gdbarch *gdbarch = current_inferior ()->arch ();
 106   if (strcmp (gdbarch_bfd_arch_info (gdbarch)->arch_name, "i386") == 0)
 107     {
 108       arch = "x86";
 109       endian = "";
 110     }
 111   else if (strcmp (gdbarch_bfd_arch_info (gdbarch)->arch_name,
 112                    "rs6000") == 0
 113            || strcmp (gdbarch_bfd_arch_info (gdbarch)->arch_name,
 114                    "powerpc") == 0)
 115     {
 116       arch = "ppc";
 117       endian = "be";
 118     }
 119   else
 120     {
 121       arch = gdbarch_bfd_arch_info (gdbarch)->arch_name;
 122       endian = gdbarch_byte_order (gdbarch)
 123                == BFD_ENDIAN_BIG ? "be" : "le";
 124     }
 125
 126   /* In case nto_root is short, add strlen(solib)
 127      so we can reuse arch_path below.  */
 128
 129   arch_len = (strlen (nto_root) + strlen (arch) + strlen (endian) + 2
 130               + strlen (solib));
 131   arch_path = (char *) alloca (arch_len);
 132   xsnprintf (arch_path, arch_len, "%s/%s%s", nto_root, arch, endian);
 133
 134   len = strlen (PATH_FMT) + strlen (arch_path) * 5 + 1;
 135   buf = (char *) alloca (len);
 136   xsnprintf (buf, len, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
 137              arch_path);
 138
 139   base = lbasename (solib);
 140   ret = openp (buf, OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, base, o_flags,
 141                temp_pathname);
 142   if (ret < 0 && base != solib)
 143     {
 144       xsnprintf (arch_path, arch_len, "/%s", solib);
 145       ret = open (arch_path, o_flags, 0);
 146       if (temp_pathname)
 147         {
 148           if (ret >= 0)
 149             *temp_pathname = gdb_realpath (arch_path);
 150           else
 151             temp_pathname->reset (NULL);
 152         }
 153     }
 154   return ret;
 155 }
 156
 157 void
 158 nto_init_solib_absolute_prefix (void)
 159 {
 160   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 161   char *nto_root;
 162   const char *endian;
 163   const char *arch;
 164
 165   nto_root = nto_target ();
 166   gdbarch *gdbarch = current_inferior ()->arch ();
 167   if (strcmp (gdbarch_bfd_arch_info (gdbarch)->arch_name, "i386") == 0)
 168     {
 169       arch = "x86";
 170       endian = "";
 171     }
 172   else if (strcmp (gdbarch_bfd_arch_info (gdbarch)->arch_name,
 173                    "rs6000") == 0
 174            || strcmp (gdbarch_bfd_arch_info (gdbarch)->arch_name,
 175                    "powerpc") == 0)
 176     {
 177       arch = "ppc";
 178       endian = "be";
 179     }
 180   else
 181     {
 182       arch = gdbarch_bfd_arch_info (gdbarch)->arch_name;
 183       endian = gdbarch_byte_order (gdbarch)
 184                == BFD_ENDIAN_BIG ? "be" : "le";
 185     }
 186
 187   xsnprintf (arch_path, sizeof (arch_path), "%s/%s%s", nto_root, arch, endian);
 188
 189   xsnprintf (buf, sizeof (buf), "set solib-absolute-prefix %s", arch_path);
 190   execute_command (buf, 0);
 191 }
 192
 193 char **
 194 nto_parse_redirection (char *pargv[], const char **pin, const char **pout,
 195                        const char **perr)
 196 {
 197   char **argv;
 198   const char *in, *out, *err, *p;
 199   int argc, i, n;
 200
 201   for (n = 0; pargv[n]; n++);
 202   if (n == 0)
 203     return NULL;
 204   in = "";
 205   out = "";
 206   err = "";
 207
 208   argv = XCNEWVEC (char *, n + 1);
 209   argc = n;
 210   for (i = 0, n = 0; n < argc; n++)
 211     {
 212       p = pargv[n];
 213       if (*p == '>')
 214         {
 215           p++;
 216           if (*p)
 217             out = p;
 218           else
 219             out = pargv[++n];
 220         }
 221       else if (*p == '<')
 222         {
 223           p++;
 224           if (*p)
 225             in = p;
 226           else
 227             in = pargv[++n];
 228         }
 229       else if (*p++ == '2' && *p++ == '>')
 230         {
 231           if (*p == '&' && *(p + 1) == '1')
 232             err = out;
 233           else if (*p)
 234             err = p;
 235           else
 236             err = pargv[++n];
 237         }
 238       else
 239         argv[i++] = pargv[n];
 240     }
 241   *pin = in;
 242   *pout = out;
 243   *perr = err;
 244   return argv;
 245 }
 246
 247 static CORE_ADDR
 248 lm_addr (const shobj &so)
 249 {
 250   auto *li = gdb::checked_static_cast<const lm_info_svr4 *> (so.lm_info.get ());
 251
 252   return li->l_addr;
 253 }
 254
 255 static CORE_ADDR
 256 nto_truncate_ptr (CORE_ADDR addr)
 257 {
 258   gdbarch *gdbarch = current_inferior ()->arch ();
 259   if (gdbarch_ptr_bit (gdbarch) == sizeof (CORE_ADDR) * 8)
 260     /* We don't need to truncate anything, and the bit twiddling below
 261        will fail due to overflow problems.  */
 262     return addr;
 263   else
 264     return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (gdbarch)) - 1);
 265 }
 266
 267 static Elf_Internal_Phdr *
 268 find_load_phdr (bfd *abfd)
 269 {
 270   Elf_Internal_Phdr *phdr;
 271   unsigned int i;
 272
 273   if (!elf_tdata (abfd))
 274     return NULL;
 275
 276   phdr = elf_tdata (abfd)->phdr;
 277   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 278     {
 279       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 280         return phdr;
 281     }
 282   return NULL;
 283 }
 284
 285 void
 286 nto_relocate_section_addresses (shobj &so, target_section *sec)
 287 {
 288   /* Neutrino treats the l_addr base address field in link.h as different than
 289      the base address in the System V ABI and so the offset needs to be
 290      calculated and applied to relocations.  */
 291   Elf_Internal_Phdr *phdr = find_load_phdr (sec->the_bfd_section->owner);
 292   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 293
 294   sec->addr = nto_truncate_ptr (sec->addr + lm_addr (so) - vaddr);
 295   sec->endaddr = nto_truncate_ptr (sec->endaddr + lm_addr (so) - vaddr);
 296 }
 297
 298 /* This is cheating a bit because our linker code is in libc.so.  If we
 299    ever implement lazy linking, this may need to be re-examined.  */
 300 int
 301 nto_in_dynsym_resolve_code (CORE_ADDR pc)
 302 {
 303   if (in_plt_section (pc))
 304     return 1;
 305   return 0;
 306 }
 307
 308 void
 309 nto_dummy_supply_regset (struct regcache *regcache, char *regs)
 310 {
 311   /* Do nothing.  */
 312 }
 313
 314 static void
 315 nto_sniff_abi_note_section (bfd *abfd, asection *sect, void *obj)
 316 {
 317   const char *sectname;
 318   unsigned int sectsize;
 319   /* Buffer holding the section contents.  */
 320   char *note;
 321   unsigned int namelen;
 322   const char *name;
 323   const unsigned sizeof_Elf_Nhdr = 12;
 324
 325   sectname = bfd_section_name (sect);
 326   sectsize = bfd_section_size (sect);
 327
 328   if (sectsize > 128)
 329     sectsize = 128;
 330
 331   if (sectname != NULL && strstr (sectname, QNX_INFO_SECT_NAME) != NULL)
 332     *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO;
 333   else if (sectname != NULL && strstr (sectname, "note") != NULL
 334            && sectsize > sizeof_Elf_Nhdr)
 335     {
 336       note = XNEWVEC (char, sectsize);
 337       bfd_get_section_contents (abfd, sect, note, 0, sectsize);
 338       namelen = (unsigned int) bfd_h_get_32 (abfd, note);
 339       name = note + sizeof_Elf_Nhdr;
 340       if (sectsize >= namelen + sizeof_Elf_Nhdr
 341           && namelen == sizeof (QNX_NOTE_NAME)
 342           && 0 == strcmp (name, QNX_NOTE_NAME))
 343         *(enum gdb_osabi *) obj = GDB_OSABI_QNXNTO;
 344
 345       XDELETEVEC (note);
 346     }
 347 }
 348
 349 enum gdb_osabi
 350 nto_elf_osabi_sniffer (bfd *abfd)
 351 {
 352   enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
 353
 354   bfd_map_over_sections (abfd,
 355                          nto_sniff_abi_note_section,
 356                          &osabi);
 357
 358   return osabi;
 359 }
 360
 361 static const char * const nto_thread_state_str[] =
 362 {
 363   "DEAD",               /* 0  0x00 */
 364   "RUNNING",    /* 1  0x01 */
 365   "READY",      /* 2  0x02 */
 366   "STOPPED",    /* 3  0x03 */
 367   "SEND",               /* 4  0x04 */
 368   "RECEIVE",    /* 5  0x05 */
 369   "REPLY",      /* 6  0x06 */
 370   "STACK",      /* 7  0x07 */
 371   "WAITTHREAD", /* 8  0x08 */
 372   "WAITPAGE",   /* 9  0x09 */
 373   "SIGSUSPEND", /* 10 0x0a */
 374   "SIGWAITINFO",        /* 11 0x0b */
 375   "NANOSLEEP",  /* 12 0x0c */
 376   "MUTEX",      /* 13 0x0d */
 377   "CONDVAR",    /* 14 0x0e */
 378   "JOIN",               /* 15 0x0f */
 379   "INTR",               /* 16 0x10 */
 380   "SEM",                /* 17 0x11 */
 381   "WAITCTX",    /* 18 0x12 */
 382   "NET_SEND",   /* 19 0x13 */
 383   "NET_REPLY"   /* 20 0x14 */
 384 };
 385
 386 const char *
 387 nto_extra_thread_info (struct target_ops *self, struct thread_info *ti)
 388 {
 389   if (ti != NULL && ti->priv != NULL)
 390     {
 391       nto_thread_info *priv = get_nto_thread_info (ti);
 392
 393       if (priv->state < ARRAY_SIZE (nto_thread_state_str))
 394         return nto_thread_state_str [priv->state];
 395     }
 396   return "";
 397 }
 398
 399 void
 400 nto_initialize_signals (void)
 401 {
 402   /* We use SIG45 for pulses, or something, so nostop, noprint
 403      and pass them.  */
 404   signal_stop_update (gdb_signal_from_name ("SIG45"), 0);
 405   signal_print_update (gdb_signal_from_name ("SIG45"), 0);
 406   signal_pass_update (gdb_signal_from_name ("SIG45"), 1);
 407
 408   /* By default we don't want to stop on these two, but we do want to pass.  */
 409 #if defined(SIGSELECT)
 410   signal_stop_update (SIGSELECT, 0);
 411   signal_print_update (SIGSELECT, 0);
 412   signal_pass_update (SIGSELECT, 1);
 413 #endif
 414
 415 #if defined(SIGPHOTON)
 416   signal_stop_update (SIGPHOTON, 0);
 417   signal_print_update (SIGPHOTON, 0);
 418   signal_pass_update (SIGPHOTON, 1);
 419 #endif
 420 }
 421
 422 /* Read AUXV from initial_stack.  */
 423 LONGEST
 424 nto_read_auxv_from_initial_stack (CORE_ADDR initial_stack, gdb_byte *readbuf,
 425                                   LONGEST len, size_t sizeof_auxv_t)
 426 {
 427   gdb_byte targ32[4]; /* For 32 bit target values.  */
 428   gdb_byte targ64[8]; /* For 64 bit target values.  */
 429   CORE_ADDR data_ofs = 0;
 430   ULONGEST anint;
 431   LONGEST len_read = 0;
 432   gdb_byte *buff;
 433   enum bfd_endian byte_order;
 434   int ptr_size;
 435
 436   if (sizeof_auxv_t == 16)
 437     ptr_size = 8;
 438   else
 439     ptr_size = 4;
 440
 441   /* Skip over argc, argv and envp... Comment from ldd.c:
 442
 443      The startup frame is set-up so that we have:
 444      auxv
 445      NULL
 446      ...
 447      envp2
 448      envp1 <----- void *frame + (argc + 2) * sizeof(char *)
 449      NULL
 450      ...
 451      argv2
 452      argv1
 453      argc  <------ void * frame
 454
 455      On entry to ldd, frame gives the address of argc on the stack.  */
 456   /* Read argc. 4 bytes on both 64 and 32 bit arches and luckily little
 457    * endian. So we just read first 4 bytes.  */
 458   if (target_read_memory (initial_stack + data_ofs, targ32, 4) != 0)
 459     return 0;
 460
 461   byte_order = gdbarch_byte_order (current_inferior ()->arch ());
 462
 463   anint = extract_unsigned_integer (targ32, sizeof (targ32), byte_order);
 464
 465   /* Size of pointer is assumed to be 4 bytes (32 bit arch.) */
 466   data_ofs += (anint + 2) * ptr_size; /* + 2 comes from argc itself and
 467                                                 NULL terminating pointer in
 468                                                 argv.  */
 469
 470   /* Now loop over env table:  */
 471   anint = 0;
 472   while (target_read_memory (initial_stack + data_ofs, targ64, ptr_size)
 473          == 0)
 474     {
 475       if (extract_unsigned_integer (targ64, ptr_size, byte_order) == 0)
 476         anint = 1; /* Keep looping until non-null entry is found.  */
 477       else if (anint)
 478         break;
 479       data_ofs += ptr_size;
 480     }
 481   initial_stack += data_ofs;
 482
 483   memset (readbuf, 0, len);
 484   buff = readbuf;
 485   while (len_read <= len-sizeof_auxv_t)
 486     {
 487       if (target_read_memory (initial_stack + len_read, buff, sizeof_auxv_t)
 488           == 0)
 489         {
 490           /* Both 32 and 64 bit structures have int as the first field.  */
 491           const ULONGEST a_type
 492             = extract_unsigned_integer (buff, sizeof (targ32), byte_order);
 493
 494           if (a_type == AT_NULL)
 495             break;
 496           buff += sizeof_auxv_t;
 497           len_read += sizeof_auxv_t;
 498         }
 499       else
 500         break;
 501     }
 502   return len_read;
 503 }
 504
 505 /* Return nto_inferior_data for the given INFERIOR.  If not yet created,
 506    construct it.  */
 507
 508 struct nto_inferior_data *
 509 nto_inferior_data (struct inferior *const inferior)
 510 {
 511   struct inferior *const inf = inferior ? inferior : current_inferior ();
 512   struct nto_inferior_data *inf_data;
 513
 514   gdb_assert (inf != NULL);
 515
 516   inf_data = nto_inferior_data_reg.get (inf);
 517   if (inf_data == NULL)
 518     inf_data = nto_inferior_data_reg.emplace (inf);
 519
 520   return inf_data;
 521 }