gdb/nto-procfs.c

   1 /* Machine independent support for QNX Neutrino /proc (process file system)
   2    for GDB.  Written by Colin Burgess at QNX Software Systems Limited.
   3
   4    Copyright (C) 2003-2022 Free Software Foundation, Inc.
   5
   6    Contributed by QNX Software Systems Ltd.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24
  25 #include <fcntl.h>
  26 #include <spawn.h>
  27 #include <sys/debug.h>
  28 #include <sys/procfs.h>
  29 #include <sys/neutrino.h>
  30 #include <sys/syspage.h>
  31 #include <dirent.h>
  32 #include <sys/netmgr.h>
  33 #include <sys/auxv.h>
  34
  35 #include "gdbcore.h"
  36 #include "inferior.h"
  37 #include "target.h"
  38 #include "objfiles.h"
  39 #include "gdbthread.h"
  40 #include "nto-tdep.h"
  41 #include "command.h"
  42 #include "regcache.h"
  43 #include "solib.h"
  44 #include "inf-child.h"
  45 #include "gdbsupport/filestuff.h"
  46 #include "gdbsupport/scoped_fd.h"
  47
  48 #define NULL_PID                0
  49 #define _DEBUG_FLAG_TRACE       (_DEBUG_FLAG_TRACE_EXEC|_DEBUG_FLAG_TRACE_RD|\
  50                 _DEBUG_FLAG_TRACE_WR|_DEBUG_FLAG_TRACE_MODIFY)
  51
  52 int ctl_fd;
  53
  54 static sighandler_t ofunc;
  55
  56 static procfs_run run;
  57
  58 /* Create the "native" and "procfs" targets.  */
  59
  60 struct nto_procfs_target : public inf_child_target
  61 {
  62   void open (const char *arg, int from_tty) override;
  63
  64   void attach (const char *, int) override = 0;
  65
  66   void post_attach (int);
  67
  68   void detach (inferior *, int) override;
  69
  70   void resume (ptid_t, int, enum gdb_signal) override;
  71
  72   ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
  73
  74   void fetch_registers (struct regcache *, int) override;
  75   void store_registers (struct regcache *, int) override;
  76
  77   enum target_xfer_status xfer_partial (enum target_object object,
  78                                         const char *annex,
  79                                         gdb_byte *readbuf,
  80                                         const gdb_byte *writebuf,
  81                                         ULONGEST offset, ULONGEST len,
  82                                         ULONGEST *xfered_len) override;
  83
  84   void files_info () override;
  85
  86   int insert_breakpoint (struct gdbarch *, struct bp_target_info *) override;
  87
  88   int remove_breakpoint (struct gdbarch *, struct bp_target_info *,
  89                          enum remove_bp_reason) override;
  90
  91   int can_use_hw_breakpoint (enum bptype, int, int) override;
  92
  93   int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
  94
  95   int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
  96
  97   int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
  98                          struct expression *) override;
  99
 100   int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
 101                          struct expression *) override;
 102
 103   bool stopped_by_watchpoint () override;
 104
 105   void kill () override;
 106
 107   void create_inferior (const char *, const std::string &,
 108                         char **, int) override;
 109
 110   void mourn_inferior () override;
 111
 112   void pass_signals (gdb::array_view<const unsigned char>) override;
 113
 114   bool thread_alive (ptid_t ptid) override;
 115
 116   void update_thread_list () override;
 117
 118   std::string pid_to_str (ptid_t) override;
 119
 120   void interrupt () override;
 121
 122   const char *extra_thread_info (struct thread_info *) override;
 123
 124   const char *pid_to_exec_file (int pid) override;
 125 };
 126
 127 /* For "target native".  */
 128
 129 static const target_info nto_native_target_info = {
 130   "native",
 131   N_("QNX Neutrino local process"),
 132   N_("QNX Neutrino local process (started by the \"run\" command).")
 133 };
 134
 135 class nto_procfs_target_native final : public nto_procfs_target
 136 {
 137   const target_info &info () const override
 138   { return nto_native_target_info; }
 139 };
 140
 141 /* For "target procfs <node>".  */
 142
 143 static const target_info nto_procfs_target_info = {
 144   "procfs",
 145   N_("QNX Neutrino local or remote process"),
 146   N_("QNX Neutrino process.  target procfs NODE")
 147 };
 148
 149 struct nto_procfs_target_procfs final : public nto_procfs_target
 150 {
 151   const target_info &info () const override
 152   { return nto_procfs_target_info; }
 153 };
 154
 155 static ptid_t do_attach (ptid_t ptid);
 156
 157 /* These two globals are only ever set in procfs_open_1, but are
 158    referenced elsewhere.  'nto_procfs_node' is a flag used to say
 159    whether we are local, or we should get the current node descriptor
 160    for the remote QNX node.  */
 161 static char *nodestr;
 162 static unsigned nto_procfs_node = ND_LOCAL_NODE;
 163
 164 /* Return the current QNX Node, or error out.  This is a simple
 165    wrapper for the netmgr_strtond() function.  The reason this
 166    is required is because QNX node descriptors are transient so
 167    we have to re-acquire them every time.  */
 168 static unsigned
 169 nto_node (void)
 170 {
 171   unsigned node;
 172
 173   if (ND_NODE_CMP (nto_procfs_node, ND_LOCAL_NODE) == 0
 174       || nodestr == NULL)
 175     return ND_LOCAL_NODE;
 176
 177   node = netmgr_strtond (nodestr, 0);
 178   if (node == -1)
 179     error (_("Lost the QNX node.  Debug session probably over."));
 180
 181   return (node);
 182 }
 183
 184 static enum gdb_osabi
 185 procfs_is_nto_target (bfd *abfd)
 186 {
 187   return GDB_OSABI_QNXNTO;
 188 }
 189
 190 /* This is called when we call 'target native' or 'target procfs
 191    <arg>' from the (gdb) prompt.  For QNX6 (nto), the only valid arg
 192    will be a QNX node string, eg: "/net/some_node".  If arg is not a
 193    valid QNX node, we will default to local.  */
 194 void
 195 nto_procfs_target::open (const char *arg, int from_tty)
 196 {
 197   char *endstr;
 198   char buffer[50];
 199   int total_size;
 200   procfs_sysinfo *sysinfo;
 201   char nto_procfs_path[PATH_MAX];
 202
 203   /* Offer to kill previous inferiors before opening this target.  */
 204   target_preopen (from_tty);
 205
 206   nto_is_nto_target = procfs_is_nto_target;
 207
 208   /* Set the default node used for spawning to this one,
 209      and only override it if there is a valid arg.  */
 210
 211   xfree (nodestr);
 212   nodestr = NULL;
 213
 214   nto_procfs_node = ND_LOCAL_NODE;
 215   nodestr = (arg != NULL) ? xstrdup (arg) : NULL;
 216
 217   if (nodestr)
 218     {
 219       nto_procfs_node = netmgr_strtond (nodestr, &endstr);
 220       if (nto_procfs_node == -1)
 221         {
 222           if (errno == ENOTSUP)
 223             gdb_printf ("QNX Net Manager not found.\n");
 224           gdb_printf ("Invalid QNX node %s: error %d (%s).\n", nodestr,
 225                       errno, safe_strerror (errno));
 226           xfree (nodestr);
 227           nodestr = NULL;
 228           nto_procfs_node = ND_LOCAL_NODE;
 229         }
 230       else if (*endstr)
 231         {
 232           if (*(endstr - 1) == '/')
 233             *(endstr - 1) = 0;
 234           else
 235             *endstr = 0;
 236         }
 237     }
 238   snprintf (nto_procfs_path, PATH_MAX - 1, "%s%s",
 239             (nodestr != NULL) ? nodestr : "", "/proc");
 240
 241   scoped_fd fd (open (nto_procfs_path, O_RDONLY));
 242   if (fd.get () == -1)
 243     {
 244       gdb_printf ("Error opening %s : %d (%s)\n", nto_procfs_path, errno,
 245                   safe_strerror (errno));
 246       error (_("Invalid procfs arg"));
 247     }
 248
 249   sysinfo = (void *) buffer;
 250   if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, sizeof buffer, 0) != EOK)
 251     {
 252       gdb_printf ("Error getting size: %d (%s)\n", errno,
 253                   safe_strerror (errno));
 254       error (_("Devctl failed."));
 255     }
 256   else
 257     {
 258       total_size = sysinfo->total_size;
 259       sysinfo = alloca (total_size);
 260       if (sysinfo == NULL)
 261         {
 262           gdb_printf ("Memory error: %d (%s)\n", errno,
 263                       safe_strerror (errno));
 264           error (_("alloca failed."));
 265         }
 266       else
 267         {
 268           if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, total_size, 0)
 269               != EOK)
 270             {
 271               gdb_printf ("Error getting sysinfo: %d (%s)\n", errno,
 272                           safe_strerror (errno));
 273               error (_("Devctl failed."));
 274             }
 275           else
 276             {
 277               if (sysinfo->type !=
 278                   nto_map_arch_to_cputype (gdbarch_bfd_arch_info
 279                                            (target_gdbarch ())->arch_name))
 280                 error (_("Invalid target CPU."));
 281             }
 282         }
 283     }
 284
 285   inf_child_target::open (arg, from_tty);
 286   gdb_printf ("Debugging using %s\n", nto_procfs_path);
 287 }
 288
 289 static void
 290 procfs_set_thread (ptid_t ptid)
 291 {
 292   pid_t tid;
 293
 294   tid = ptid.tid ();
 295   devctl (ctl_fd, DCMD_PROC_CURTHREAD, &tid, sizeof (tid), 0);
 296 }
 297
 298 /*  Return true if the thread TH is still alive.  */
 299
 300 bool
 301 nto_procfs_target::thread_alive (ptid_t ptid)
 302 {
 303   pid_t tid;
 304   pid_t pid;
 305   procfs_status status;
 306   int err;
 307
 308   tid = ptid.tid ();
 309   pid = ptid.pid ();
 310
 311   if (kill (pid, 0) == -1)
 312     return false;
 313
 314   status.tid = tid;
 315   if ((err = devctl (ctl_fd, DCMD_PROC_TIDSTATUS,
 316                      &status, sizeof (status), 0)) != EOK)
 317     return false;
 318
 319   /* Thread is alive or dead but not yet joined,
 320      or dead and there is an alive (or dead unjoined) thread with
 321      higher tid.
 322
 323      If the tid is not the same as requested, requested tid is dead.  */
 324   return (status.tid == tid) && (status.state != STATE_DEAD);
 325 }
 326
 327 static void
 328 update_thread_private_data_name (struct thread_info *new_thread,
 329                                  const char *newname)
 330 {
 331   nto_thread_info *pti = get_nto_thread_info (new_thread);
 332
 333   gdb_assert (newname != NULL);
 334   gdb_assert (new_thread != NULL);
 335
 336   if (pti)
 337     {
 338       pti = new nto_thread_info;
 339       new_thread->priv.reset (pti);
 340     }
 341
 342   pti->name = newname;
 343 }
 344
 345 static void
 346 update_thread_private_data (struct thread_info *new_thread,
 347                             pthread_t tid, int state, int flags)
 348 {
 349   procfs_info pidinfo;
 350   struct _thread_name *tn;
 351   procfs_threadctl tctl;
 352
 353 #if _NTO_VERSION > 630
 354   gdb_assert (new_thread != NULL);
 355
 356   if (devctl (ctl_fd, DCMD_PROC_INFO, &pidinfo,
 357               sizeof(pidinfo), 0) != EOK)
 358     return;
 359
 360   memset (&tctl, 0, sizeof (tctl));
 361   tctl.cmd = _NTO_TCTL_NAME;
 362   tn = (struct _thread_name *) (&tctl.data);
 363
 364   /* Fetch name for the given thread.  */
 365   tctl.tid = tid;
 366   tn->name_buf_len = sizeof (tctl.data) - sizeof (*tn);
 367   tn->new_name_len = -1; /* Getting, not setting.  */
 368   if (devctl (ctl_fd, DCMD_PROC_THREADCTL, &tctl, sizeof (tctl), NULL) != EOK)
 369     tn->name_buf[0] = '\0';
 370
 371   tn->name_buf[_NTO_THREAD_NAME_MAX] = '\0';
 372
 373   update_thread_private_data_name (new_thread, tn->name_buf);
 374
 375   nto_thread_info *pti = get_nto_thread_info (new_thread);
 376   pti->tid = tid;
 377   pti->state = state;
 378   pti->flags = flags;
 379 #endif /* _NTO_VERSION */
 380 }
 381
 382 void
 383 nto_procfs_target::update_thread_list ()
 384 {
 385   procfs_status status;
 386   pid_t pid;
 387   ptid_t ptid;
 388   pthread_t tid;
 389   struct thread_info *new_thread;
 390
 391   if (ctl_fd == -1)
 392     return;
 393
 394   prune_threads ();
 395
 396   pid = current_inferior ()->pid;
 397
 398   status.tid = 1;
 399
 400   for (tid = 1;; ++tid)
 401     {
 402       if (status.tid == tid
 403           && (devctl (ctl_fd, DCMD_PROC_TIDSTATUS, &status, sizeof (status), 0)
 404               != EOK))
 405         break;
 406       if (status.tid != tid)
 407         /* The reason why this would not be equal is that devctl might have
 408            returned different tid, meaning the requested tid no longer exists
 409            (e.g. thread exited).  */
 410         continue;
 411       ptid = ptid_t (pid, 0, tid);
 412       new_thread = find_thread_ptid (this, ptid);
 413       if (!new_thread)
 414         new_thread = add_thread (ptid);
 415       update_thread_private_data (new_thread, tid, status.state, 0);
 416       status.tid++;
 417     }
 418   return;
 419 }
 420
 421 static void
 422 procfs_pidlist (const char *args, int from_tty)
 423 {
 424   struct dirent *dirp = NULL;
 425   char buf[PATH_MAX];
 426   procfs_info *pidinfo = NULL;
 427   procfs_debuginfo *info = NULL;
 428   procfs_status *status = NULL;
 429   pid_t num_threads = 0;
 430   pid_t pid;
 431   char name[512];
 432   char procfs_dir[PATH_MAX];
 433
 434   snprintf (procfs_dir, sizeof (procfs_dir), "%s%s",
 435             (nodestr != NULL) ? nodestr : "", "/proc");
 436
 437   gdb_dir_up dp (opendir (procfs_dir));
 438   if (dp == NULL)
 439     {
 440       gdb_printf (gdb_stderr, "failed to opendir \"%s\" - %d (%s)",
 441                   procfs_dir, errno, safe_strerror (errno));
 442       return;
 443     }
 444
 445   /* Start scan at first pid.  */
 446   rewinddir (dp.get ());
 447
 448   do
 449     {
 450       /* Get the right pid and procfs path for the pid.  */
 451       do
 452         {
 453           dirp = readdir (dp.get ());
 454           if (dirp == NULL)
 455             return;
 456           snprintf (buf, sizeof (buf), "%s%s/%s/as",
 457                     (nodestr != NULL) ? nodestr : "",
 458                     "/proc", dirp->d_name);
 459           pid = atoi (dirp->d_name);
 460         }
 461       while (pid == 0);
 462
 463       /* Open the procfs path.  */
 464       scoped_fd fd (open (buf, O_RDONLY));
 465       if (fd.get () == -1)
 466         {
 467           gdb_printf (gdb_stderr, "failed to open %s - %d (%s)\n",
 468                       buf, errno, safe_strerror (errno));
 469           continue;
 470         }
 471
 472       pidinfo = (procfs_info *) buf;
 473       if (devctl (fd.get (), DCMD_PROC_INFO, pidinfo, sizeof (buf), 0) != EOK)
 474         {
 475           gdb_printf (gdb_stderr,
 476                       "devctl DCMD_PROC_INFO failed - %d (%s)\n",
 477                       errno, safe_strerror (errno));
 478           break;
 479         }
 480       num_threads = pidinfo->num_threads;
 481
 482       info = (procfs_debuginfo *) buf;
 483       if (devctl (fd.get (), DCMD_PROC_MAPDEBUG_BASE, info, sizeof (buf), 0)
 484           != EOK)
 485         strcpy (name, "unavailable");
 486       else
 487         strcpy (name, info->path);
 488
 489       /* Collect state info on all the threads.  */
 490       status = (procfs_status *) buf;
 491       for (status->tid = 1; status->tid <= num_threads; status->tid++)
 492         {
 493           const int err
 494             = devctl (fd.get (), DCMD_PROC_TIDSTATUS, status, sizeof (buf), 0);
 495           gdb_printf ("%s - %d", name, pid);
 496           if (err == EOK && status->tid != 0)
 497             gdb_printf ("/%d\n", status->tid);
 498           else
 499             {
 500               gdb_printf ("\n");
 501               break;
 502             }
 503         }
 504     }
 505   while (dirp != NULL);
 506 }
 507
 508 static void
 509 procfs_meminfo (const char *args, int from_tty)
 510 {
 511   procfs_mapinfo *mapinfos = NULL;
 512   static int num_mapinfos = 0;
 513   procfs_mapinfo *mapinfo_p, *mapinfo_p2;
 514   int flags = ~0, err, num, i, j;
 515
 516   struct
 517   {
 518     procfs_debuginfo info;
 519     char buff[_POSIX_PATH_MAX];
 520   } map;
 521
 522   struct info
 523   {
 524     unsigned addr;
 525     unsigned size;
 526     unsigned flags;
 527     unsigned debug_vaddr;
 528     unsigned long long offset;
 529   };
 530
 531   struct printinfo
 532   {
 533     unsigned long long ino;
 534     unsigned dev;
 535     struct info text;
 536     struct info data;
 537     char name[256];
 538   } printme;
 539
 540   /* Get the number of map entrys.  */
 541   err = devctl (ctl_fd, DCMD_PROC_MAPINFO, NULL, 0, &num);
 542   if (err != EOK)
 543     {
 544       printf ("failed devctl num mapinfos - %d (%s)\n", err,
 545               safe_strerror (err));
 546       return;
 547     }
 548
 549   mapinfos = XNEWVEC (procfs_mapinfo, num);
 550
 551   num_mapinfos = num;
 552   mapinfo_p = mapinfos;
 553
 554   /* Fill the map entrys.  */
 555   err = devctl (ctl_fd, DCMD_PROC_MAPINFO, mapinfo_p, num
 556                 * sizeof (procfs_mapinfo), &num);
 557   if (err != EOK)
 558     {
 559       printf ("failed devctl mapinfos - %d (%s)\n", err, safe_strerror (err));
 560       xfree (mapinfos);
 561       return;
 562     }
 563
 564   num = std::min (num, num_mapinfos);
 565
 566   /* Run through the list of mapinfos, and store the data and text info
 567      so we can print it at the bottom of the loop.  */
 568   for (mapinfo_p = mapinfos, i = 0; i < num; i++, mapinfo_p++)
 569     {
 570       if (!(mapinfo_p->flags & flags))
 571         mapinfo_p->ino = 0;
 572
 573       if (mapinfo_p->ino == 0)  /* Already visited.  */
 574         continue;
 575
 576       map.info.vaddr = mapinfo_p->vaddr;
 577
 578       err = devctl (ctl_fd, DCMD_PROC_MAPDEBUG, &map, sizeof (map), 0);
 579       if (err != EOK)
 580         continue;
 581
 582       memset (&printme, 0, sizeof printme);
 583       printme.dev = mapinfo_p->dev;
 584       printme.ino = mapinfo_p->ino;
 585       printme.text.addr = mapinfo_p->vaddr;
 586       printme.text.size = mapinfo_p->size;
 587       printme.text.flags = mapinfo_p->flags;
 588       printme.text.offset = mapinfo_p->offset;
 589       printme.text.debug_vaddr = map.info.vaddr;
 590       strcpy (printme.name, map.info.path);
 591
 592       /* Check for matching data.  */
 593       for (mapinfo_p2 = mapinfos, j = 0; j < num; j++, mapinfo_p2++)
 594         {
 595           if (mapinfo_p2->vaddr != mapinfo_p->vaddr
 596               && mapinfo_p2->ino == mapinfo_p->ino
 597               && mapinfo_p2->dev == mapinfo_p->dev)
 598             {
 599               map.info.vaddr = mapinfo_p2->vaddr;
 600               err =
 601                 devctl (ctl_fd, DCMD_PROC_MAPDEBUG, &map, sizeof (map), 0);
 602               if (err != EOK)
 603                 continue;
 604
 605               if (strcmp (map.info.path, printme.name))
 606                 continue;
 607
 608               /* Lower debug_vaddr is always text, if necessary, swap.  */
 609               if ((int) map.info.vaddr < (int) printme.text.debug_vaddr)
 610                 {
 611                   memcpy (&(printme.data), &(printme.text),
 612                           sizeof (printme.data));
 613                   printme.text.addr = mapinfo_p2->vaddr;
 614                   printme.text.size = mapinfo_p2->size;
 615                   printme.text.flags = mapinfo_p2->flags;
 616                   printme.text.offset = mapinfo_p2->offset;
 617                   printme.text.debug_vaddr = map.info.vaddr;
 618                 }
 619               else
 620                 {
 621                   printme.data.addr = mapinfo_p2->vaddr;
 622                   printme.data.size = mapinfo_p2->size;
 623                   printme.data.flags = mapinfo_p2->flags;
 624                   printme.data.offset = mapinfo_p2->offset;
 625                   printme.data.debug_vaddr = map.info.vaddr;
 626                 }
 627               mapinfo_p2->ino = 0;
 628             }
 629         }
 630       mapinfo_p->ino = 0;
 631
 632       gdb_printf ("%s\n", printme.name);
 633       gdb_printf ("\ttext=%08x bytes @ 0x%08x\n", printme.text.size,
 634                   printme.text.addr);
 635       gdb_printf ("\t\tflags=%08x\n", printme.text.flags);
 636       gdb_printf ("\t\tdebug=%08x\n", printme.text.debug_vaddr);
 637       gdb_printf ("\t\toffset=%s\n", phex (printme.text.offset, 8));
 638       if (printme.data.size)
 639         {
 640           gdb_printf ("\tdata=%08x bytes @ 0x%08x\n", printme.data.size,
 641                       printme.data.addr);
 642           gdb_printf ("\t\tflags=%08x\n", printme.data.flags);
 643           gdb_printf ("\t\tdebug=%08x\n", printme.data.debug_vaddr);
 644           gdb_printf ("\t\toffset=%s\n", phex (printme.data.offset, 8));
 645         }
 646       gdb_printf ("\tdev=0x%x\n", printme.dev);
 647       gdb_printf ("\tino=0x%x\n", (unsigned int) printme.ino);
 648     }
 649   xfree (mapinfos);
 650   return;
 651 }
 652
 653 /* Print status information about what we're accessing.  */
 654 void
 655 nto_procfs_target::files_info ()
 656 {
 657   struct inferior *inf = current_inferior ();
 658
 659   gdb_printf ("\tUsing the running image of %s %s via %s.\n",
 660               inf->attach_flag ? "attached" : "child",
 661               target_pid_to_str (inferior_ptid).c_str (),
 662               (nodestr != NULL) ? nodestr : "local node");
 663 }
 664
 665 /* Target to_pid_to_exec_file implementation.  */
 666
 667 const char *
 668 nto_procfs_target::pid_to_exec_file (const int pid)
 669 {
 670   int proc_fd;
 671   static char proc_path[PATH_MAX];
 672   ssize_t rd;
 673
 674   /* Read exe file name.  */
 675   snprintf (proc_path, sizeof (proc_path), "%s/proc/%d/exefile",
 676             (nodestr != NULL) ? nodestr : "", pid);
 677   proc_fd = open (proc_path, O_RDONLY);
 678   if (proc_fd == -1)
 679     return NULL;
 680
 681   rd = read (proc_fd, proc_path, sizeof (proc_path) - 1);
 682   close (proc_fd);
 683   if (rd <= 0)
 684     {
 685       proc_path[0] = '\0';
 686       return NULL;
 687     }
 688   proc_path[rd] = '\0';
 689   return proc_path;
 690 }
 691
 692 /* Attach to process PID, then initialize for debugging it.  */
 693 void
 694 nto_procfs_target::attach (const char *args, int from_tty)
 695 {
 696   int pid;
 697   struct inferior *inf;
 698
 699   pid = parse_pid_to_attach (args);
 700
 701   if (pid == getpid ())
 702     error (_("Attaching GDB to itself is not a good idea..."));
 703
 704   target_announce_attach (from_tty, pid);
 705
 706   ptid_t ptid = do_attach (ptid_t (pid));
 707   inf = current_inferior ();
 708   inferior_appeared (inf, pid);
 709   inf->attach_flag = 1;
 710
 711   if (!inf->target_is_pushed (ops))
 712     inf->push_target (ops);
 713
 714   update_thread_list ();
 715
 716   switch_to_thread (find_thread_ptid (this, ptid));
 717 }
 718
 719 void
 720 nto_procfs_target::post_attach (pid_t pid)
 721 {
 722   if (current_program_space->exec_bfd ())
 723     solib_create_inferior_hook (0);
 724 }
 725
 726 static ptid_t
 727 do_attach (ptid_t ptid)
 728 {
 729   procfs_status status;
 730   struct sigevent event;
 731   char path[PATH_MAX];
 732
 733   snprintf (path, PATH_MAX - 1, "%s%s/%d/as",
 734             (nodestr != NULL) ? nodestr : "", "/proc", ptid.pid ());
 735   ctl_fd = open (path, O_RDWR);
 736   if (ctl_fd == -1)
 737     error (_("Couldn't open proc file %s, error %d (%s)"), path, errno,
 738            safe_strerror (errno));
 739   if (devctl (ctl_fd, DCMD_PROC_STOP, &status, sizeof (status), 0) != EOK)
 740     error (_("Couldn't stop process"));
 741
 742   /* Define a sigevent for process stopped notification.  */
 743   event.sigev_notify = SIGEV_SIGNAL_THREAD;
 744   event.sigev_signo = SIGUSR1;
 745   event.sigev_code = 0;
 746   event.sigev_value.sival_ptr = NULL;
 747   event.sigev_priority = -1;
 748   devctl (ctl_fd, DCMD_PROC_EVENT, &event, sizeof (event), 0);
 749
 750   if (devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0) == EOK
 751       && status.flags & _DEBUG_FLAG_STOPPED)
 752     SignalKill (nto_node (), ptid.pid (), 0, SIGCONT, 0, 0);
 753   nto_init_solib_absolute_prefix ();
 754   return ptid_t (ptid.pid (), 0, status.tid);
 755 }
 756
 757 /* Ask the user what to do when an interrupt is received.  */
 758 static void
 759 interrupt_query (void)
 760 {
 761   if (query (_("Interrupted while waiting for the program.\n\
 762 Give up (and stop debugging it)? ")))
 763     {
 764       target_mourn_inferior (inferior_ptid);
 765       quit ();
 766     }
 767 }
 768
 769 /* The user typed ^C twice.  */
 770 static void
 771 nto_handle_sigint_twice (int signo)
 772 {
 773   signal (signo, ofunc);
 774   interrupt_query ();
 775   signal (signo, nto_handle_sigint_twice);
 776 }
 777
 778 static void
 779 nto_handle_sigint (int signo)
 780 {
 781   /* If this doesn't work, try more severe steps.  */
 782   signal (signo, nto_handle_sigint_twice);
 783
 784   target_interrupt ();
 785 }
 786
 787 sptid_t
 788 nto_procfs_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
 789                          target_wait_flags options)
 790 {
 791   sigset_t set;
 792   siginfo_t info;
 793   procfs_status status;
 794   static int exit_signo = 0;    /* To track signals that cause termination.  */
 795
 796   ourstatus->set_spurious ();
 797
 798   if (inferior_ptid == null_ptid)
 799     {
 800       ourstatus->set_stopped (GDB_SIGNAL_0);
 801       exit_signo = 0;
 802       return null_ptid;
 803     }
 804
 805   sigemptyset (&set);
 806   sigaddset (&set, SIGUSR1);
 807
 808   devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
 809   while (!(status.flags & _DEBUG_FLAG_ISTOP))
 810     {
 811       ofunc = signal (SIGINT, nto_handle_sigint);
 812       sigwaitinfo (&set, &info);
 813       signal (SIGINT, ofunc);
 814       devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
 815     }
 816
 817   nto_inferior_data (NULL)->stopped_flags = status.flags;
 818   nto_inferior_data (NULL)->stopped_pc = status.ip;
 819
 820   if (status.flags & _DEBUG_FLAG_SSTEP)
 821     ourstatus->set_stopped (GDB_SIGNAL_TRAP);
 822   /* Was it a breakpoint?  */
 823   else if (status.flags & _DEBUG_FLAG_TRACE)
 824     ourstatus->set_stopped (GDB_SIGNAL_TRAP);
 825   else if (status.flags & _DEBUG_FLAG_ISTOP)
 826     {
 827       switch (status.why)
 828         {
 829         case _DEBUG_WHY_SIGNALLED:
 830           ourstatus->set_stopped (gdb_signal_from_host (status.info.si_signo));
 831           exit_signo = 0;
 832           break;
 833         case _DEBUG_WHY_FAULTED:
 834           if (status.info.si_signo == SIGTRAP)
 835             {
 836               ourstatus->set_stopped (0);
 837               exit_signo = 0;
 838             }
 839           else
 840             {
 841               ourstatus->set_stopped
 842                 (gdb_signal_from_host (status.info.si_signo));
 843               exit_signo = ourstatus->sig ();
 844             }
 845           break;
 846
 847         case _DEBUG_WHY_TERMINATED:
 848           {
 849             int waitval = 0;
 850
 851             waitpid (inferior_ptid.pid (), &waitval, WNOHANG);
 852             if (exit_signo)
 853               {
 854                 /* Abnormal death.  */
 855                 ourstatus->set_signalled (exit_signo);
 856               }
 857             else
 858               {
 859                 /* Normal death.  */
 860                 ourstatus->set_exited (WEXITSTATUS (waitval));
 861               }
 862             exit_signo = 0;
 863             break;
 864           }
 865
 866         case _DEBUG_WHY_REQUESTED:
 867           /* We are assuming a requested stop is due to a SIGINT.  */
 868           ourstatus->set_stopped (GDB_SIGNAL_INT);
 869           exit_signo = 0;
 870           break;
 871         }
 872     }
 873
 874   return ptid_t (status.pid, 0, status.tid);
 875 }
 876
 877 /* Read the current values of the inferior's registers, both the
 878    general register set and floating point registers (if supported)
 879    and update gdb's idea of their current values.  */
 880 void
 881 nto_procfs_target::fetch_registers (struct regcache *regcache, int regno)
 882 {
 883   union
 884   {
 885     procfs_greg greg;
 886     procfs_fpreg fpreg;
 887     procfs_altreg altreg;
 888   }
 889   reg;
 890   int regsize;
 891
 892   procfs_set_thread (regcache->ptid ());
 893   if (devctl (ctl_fd, DCMD_PROC_GETGREG, &reg, sizeof (reg), &regsize) == EOK)
 894     nto_supply_gregset (regcache, (char *) &reg.greg);
 895   if (devctl (ctl_fd, DCMD_PROC_GETFPREG, &reg, sizeof (reg), &regsize)
 896       == EOK)
 897     nto_supply_fpregset (regcache, (char *) &reg.fpreg);
 898   if (devctl (ctl_fd, DCMD_PROC_GETALTREG, &reg, sizeof (reg), &regsize)
 899       == EOK)
 900     nto_supply_altregset (regcache, (char *) &reg.altreg);
 901 }
 902
 903 /* Helper for procfs_xfer_partial that handles memory transfers.
 904    Arguments are like target_xfer_partial.  */
 905
 906 static enum target_xfer_status
 907 procfs_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,
 908                     ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)
 909 {
 910   int nbytes;
 911
 912   if (lseek (ctl_fd, (off_t) memaddr, SEEK_SET) != (off_t) memaddr)
 913     return TARGET_XFER_E_IO;
 914
 915   if (writebuf != NULL)
 916     nbytes = write (ctl_fd, writebuf, len);
 917   else
 918     nbytes = read (ctl_fd, readbuf, len);
 919   if (nbytes <= 0)
 920     return TARGET_XFER_E_IO;
 921   *xfered_len = nbytes;
 922   return TARGET_XFER_OK;
 923 }
 924
 925 /* Target to_xfer_partial implementation.  */
 926
 927 enum target_xfer_status
 928 nto_procfs_target::xfer_partial (enum target_object object,
 929                                  const char *annex, gdb_byte *readbuf,
 930                                  const gdb_byte *writebuf, ULONGEST offset,
 931                                  ULONGEST len, ULONGEST *xfered_len)
 932 {
 933   switch (object)
 934     {
 935     case TARGET_OBJECT_MEMORY:
 936       return procfs_xfer_memory (readbuf, writebuf, offset, len, xfered_len);
 937     case TARGET_OBJECT_AUXV:
 938       if (readbuf != NULL)
 939         {
 940           int err;
 941           CORE_ADDR initial_stack;
 942           debug_process_t procinfo;
 943           /* For 32-bit architecture, size of auxv_t is 8 bytes.  */
 944           const unsigned int sizeof_auxv_t = sizeof (auxv_t);
 945           const unsigned int sizeof_tempbuf = 20 * sizeof_auxv_t;
 946           int tempread;
 947           gdb_byte *const tempbuf = alloca (sizeof_tempbuf);
 948
 949           if (tempbuf == NULL)
 950             return TARGET_XFER_E_IO;
 951
 952           err = devctl (ctl_fd, DCMD_PROC_INFO, &procinfo,
 953                         sizeof procinfo, 0);
 954           if (err != EOK)
 955             return TARGET_XFER_E_IO;
 956
 957           initial_stack = procinfo.initial_stack;
 958
 959           /* procfs is always 'self-hosted', no byte-order manipulation.  */
 960           tempread = nto_read_auxv_from_initial_stack (initial_stack, tempbuf,
 961                                                        sizeof_tempbuf,
 962                                                        sizeof (auxv_t));
 963           tempread = std::min (tempread, len) - offset;
 964           memcpy (readbuf, tempbuf + offset, tempread);
 965           *xfered_len = tempread;
 966           return tempread ? TARGET_XFER_OK : TARGET_XFER_EOF;
 967         }
 968         /* Fallthru */
 969     default:
 970       return this->beneath ()->xfer_partial (object, annex,
 971                                              readbuf, writebuf, offset, len,
 972                                              xfered_len);
 973     }
 974 }
 975
 976 /* Take a program previously attached to and detaches it.
 977    The program resumes execution and will no longer stop
 978    on signals, etc.  We'd better not have left any breakpoints
 979    in the program or it'll die when it hits one.  */
 980 void
 981 nto_procfs_target::detach (inferior *inf, int from_tty)
 982 {
 983   target_announce_detach ();
 984
 985   if (siggnal)
 986     SignalKill (nto_node (), inf->pid, 0, 0, 0, 0);
 987
 988   close (ctl_fd);
 989   ctl_fd = -1;
 990
 991   switch_to_no_thread ();
 992   detach_inferior (inf->pid);
 993   init_thread_list ();
 994   inf_child_maybe_unpush_target (ops);
 995 }
 996
 997 static int
 998 procfs_breakpoint (CORE_ADDR addr, int type, int size)
 999 {
1000   procfs_break brk;
1001
1002   brk.type = type;
1003   brk.addr = addr;
1004   brk.size = size;
1005   errno = devctl (ctl_fd, DCMD_PROC_BREAK, &brk, sizeof (brk), 0);
1006   if (errno != EOK)
1007     return 1;
1008   return 0;
1009 }
1010
1011 int
1012 nto_procfs_target::insert_breakpoint (struct gdbarch *gdbarch,
1013                                       struct bp_target_info *bp_tgt)
1014 {
1015   bp_tgt->placed_address = bp_tgt->reqstd_address;
1016   return procfs_breakpoint (bp_tgt->placed_address, _DEBUG_BREAK_EXEC, 0);
1017 }
1018
1019 int
1020 nto_procfs_target::remove_breakpoint (struct gdbarch *gdbarch,
1021                                       struct bp_target_info *bp_tgt,
1022                                       enum remove_bp_reason reason)
1023 {
1024   return procfs_breakpoint (bp_tgt->placed_address, _DEBUG_BREAK_EXEC, -1);
1025 }
1026
1027 int
1028 nto_procfs_target::insert_hw_breakpoint (struct gdbarch *gdbarch,
1029                                          struct bp_target_info *bp_tgt)
1030 {
1031   bp_tgt->placed_address = bp_tgt->reqstd_address;
1032   return procfs_breakpoint (bp_tgt->placed_address,
1033                             _DEBUG_BREAK_EXEC | _DEBUG_BREAK_HW, 0);
1034 }
1035
1036 int
1037 nto_procfs_target::remove_hw_breakpoint (struct gdbarch *gdbarch,
1038                                          struct bp_target_info *bp_tgt)
1039 {
1040   return procfs_breakpoint (bp_tgt->placed_address,
1041                             _DEBUG_BREAK_EXEC | _DEBUG_BREAK_HW, -1);
1042 }
1043
1044 void
1045 nto_procfs_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
1046 {
1047   int signal_to_pass;
1048   procfs_status status;
1049   sigset_t *run_fault = (sigset_t *) (void *) &run.fault;
1050
1051   if (inferior_ptid == null_ptid)
1052     return;
1053
1054   procfs_set_thread (ptid == minus_one_ptid ? inferior_ptid :
1055                      ptid);
1056
1057   run.flags = _DEBUG_RUN_FAULT | _DEBUG_RUN_TRACE;
1058   if (step)
1059     run.flags |= _DEBUG_RUN_STEP;
1060
1061   sigemptyset (run_fault);
1062   sigaddset (run_fault, FLTBPT);
1063   sigaddset (run_fault, FLTTRACE);
1064   sigaddset (run_fault, FLTILL);
1065   sigaddset (run_fault, FLTPRIV);
1066   sigaddset (run_fault, FLTBOUNDS);
1067   sigaddset (run_fault, FLTIOVF);
1068   sigaddset (run_fault, FLTIZDIV);
1069   sigaddset (run_fault, FLTFPE);
1070   /* Peter V will be changing this at some point.  */
1071   sigaddset (run_fault, FLTPAGE);
1072
1073   run.flags |= _DEBUG_RUN_ARM;
1074
1075   signal_to_pass = gdb_signal_to_host (signo);
1076
1077   if (signal_to_pass)
1078     {
1079       devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
1080       signal_to_pass = gdb_signal_to_host (signo);
1081       if (status.why & (_DEBUG_WHY_SIGNALLED | _DEBUG_WHY_FAULTED))
1082         {
1083           if (signal_to_pass != status.info.si_signo)
1084             {
1085               SignalKill (nto_node (), inferior_ptid.pid (), 0,
1086                           signal_to_pass, 0, 0);
1087               run.flags |= _DEBUG_RUN_CLRFLT | _DEBUG_RUN_CLRSIG;
1088             }
1089           else          /* Let it kill the program without telling us.  */
1090             sigdelset (&run.trace, signal_to_pass);
1091         }
1092     }
1093   else
1094     run.flags |= _DEBUG_RUN_CLRSIG | _DEBUG_RUN_CLRFLT;
1095
1096   errno = devctl (ctl_fd, DCMD_PROC_RUN, &run, sizeof (run), 0);
1097   if (errno != EOK)
1098     {
1099       perror (_("run error!\n"));
1100       return;
1101     }
1102 }
1103
1104 void
1105 nto_procfs_target::mourn_inferior ()
1106 {
1107   if (inferior_ptid != null_ptid)
1108     {
1109       SignalKill (nto_node (), inferior_ptid.pid (), 0, SIGKILL, 0, 0);
1110       close (ctl_fd);
1111     }
1112   switch_to_no_thread ();
1113   init_thread_list ();
1114   inf_child_mourn_inferior (ops);
1115 }
1116
1117 /* This function breaks up an argument string into an argument
1118    vector suitable for passing to execvp().
1119    E.g., on "run a b c d" this routine would get as input
1120    the string "a b c d", and as output it would fill in argv with
1121    the four arguments "a", "b", "c", "d".  The only additional
1122    functionality is simple quoting.  The gdb command:
1123         run a "b c d" f
1124    will fill in argv with the three args "a", "b c d", "e".  */
1125 static void
1126 breakup_args (char *scratch, char **argv)
1127 {
1128   char *pp, *cp = scratch;
1129   char quoting = 0;
1130
1131   for (;;)
1132     {
1133       /* Scan past leading separators.  */
1134       quoting = 0;
1135       while (*cp == ' ' || *cp == '\t' || *cp == '\n')
1136         cp++;
1137
1138       /* Break if at end of string.  */
1139       if (*cp == '\0')
1140         break;
1141
1142       /* Take an arg.  */
1143       if (*cp == '"')
1144         {
1145           cp++;
1146           quoting = strchr (cp, '"') ? 1 : 0;
1147         }
1148
1149       *argv++ = cp;
1150
1151       /* Scan for next arg separator.  */
1152       pp = cp;
1153       if (quoting)
1154         cp = strchr (pp, '"');
1155       if ((cp == NULL) || (!quoting))
1156         cp = strchr (pp, ' ');
1157       if (cp == NULL)
1158         cp = strchr (pp, '\t');
1159       if (cp == NULL)
1160         cp = strchr (pp, '\n');
1161
1162       /* No separators => end of string => break.  */
1163       if (cp == NULL)
1164         {
1165           pp = cp;
1166           break;
1167         }
1168
1169       /* Replace the separator with a terminator.  */
1170       *cp++ = '\0';
1171     }
1172
1173   /* Execv requires a null-terminated arg vector.  */
1174   *argv = NULL;
1175 }
1176
1177 void
1178 nto_procfs_target::create_inferior (const char *exec_file,
1179                                     const std::string &allargs,
1180                                     char **env, int from_tty)
1181 {
1182   struct inheritance inherit;
1183   pid_t pid;
1184   int flags, errn;
1185   char **argv, *args;
1186   const char *in = "", *out = "", *err = "";
1187   int fd, fds[3];
1188   sigset_t set;
1189   struct inferior *inf;
1190
1191   argv = xmalloc ((allargs.size () / (unsigned) 2 + 2) *
1192                   sizeof (*argv));
1193   argv[0] = const_cast<char *> (get_exec_file (1));
1194   if (!argv[0])
1195     {
1196       if (exec_file)
1197         argv[0] = exec_file;
1198       else
1199         return;
1200     }
1201
1202   args = xstrdup (allargs.c_str ());
1203   breakup_args (args, (exec_file != NULL) ? &argv[1] : &argv[0]);
1204
1205   argv = nto_parse_redirection (argv, &in, &out, &err);
1206
1207   fds[0] = STDIN_FILENO;
1208   fds[1] = STDOUT_FILENO;
1209   fds[2] = STDERR_FILENO;
1210
1211   /* If the user specified I/O via gdb's --tty= arg, use it, but only
1212      if the i/o is not also being specified via redirection.  */
1213   const char *inferior_tty = current_inferior ()->tty ();
1214   if (inferior_tty != nullptr)
1215     {
1216       if (!in[0])
1217         in = inferior_tty;
1218       if (!out[0])
1219         out = inferior_tty;
1220       if (!err[0])
1221         err = inferior_tty;
1222     }
1223
1224   if (in[0])
1225     {
1226       fd = open (in, O_RDONLY);
1227       if (fd == -1)
1228         perror (in);
1229       else
1230         fds[0] = fd;
1231     }
1232   if (out[0])
1233     {
1234       fd = open (out, O_WRONLY);
1235       if (fd == -1)
1236         perror (out);
1237       else
1238         fds[1] = fd;
1239     }
1240   if (err[0])
1241     {
1242       fd = open (err, O_WRONLY);
1243       if (fd == -1)
1244         perror (err);
1245       else
1246         fds[2] = fd;
1247     }
1248
1249   /* Clear any pending SIGUSR1's but keep the behavior the same.  */
1250   signal (SIGUSR1, signal (SIGUSR1, SIG_IGN));
1251
1252   sigemptyset (&set);
1253   sigaddset (&set, SIGUSR1);
1254   sigprocmask (SIG_UNBLOCK, &set, NULL);
1255
1256   memset (&inherit, 0, sizeof (inherit));
1257
1258   if (ND_NODE_CMP (nto_procfs_node, ND_LOCAL_NODE) != 0)
1259     {
1260       inherit.nd = nto_node ();
1261       inherit.flags |= SPAWN_SETND;
1262       inherit.flags &= ~SPAWN_EXEC;
1263     }
1264   inherit.flags |= SPAWN_SETGROUP | SPAWN_HOLD;
1265   inherit.pgroup = SPAWN_NEWPGROUP;
1266   pid = spawnp (argv[0], 3, fds, &inherit, argv,
1267                 ND_NODE_CMP (nto_procfs_node, ND_LOCAL_NODE) == 0 ? env : 0);
1268   xfree (args);
1269
1270   sigprocmask (SIG_BLOCK, &set, NULL);
1271
1272   if (pid == -1)
1273     error (_("Error spawning %s: %d (%s)"), argv[0], errno,
1274            safe_strerror (errno));
1275
1276   if (fds[0] != STDIN_FILENO)
1277     close (fds[0]);
1278   if (fds[1] != STDOUT_FILENO)
1279     close (fds[1]);
1280   if (fds[2] != STDERR_FILENO)
1281     close (fds[2]);
1282
1283   ptid_t ptid = do_attach (ptid_t (pid));
1284   update_thread_list ();
1285   switch_to_thread (find_thread_ptid (this, ptid));
1286
1287   inf = current_inferior ();
1288   inferior_appeared (inf, pid);
1289   inf->attach_flag = 0;
1290
1291   flags = _DEBUG_FLAG_KLC;      /* Kill-on-Last-Close flag.  */
1292   errn = devctl (ctl_fd, DCMD_PROC_SET_FLAG, &flags, sizeof (flags), 0);
1293   if (errn != EOK)
1294     {
1295       /* FIXME: expected warning?  */
1296       /* warning( "Failed to set Kill-on-Last-Close flag: errno = %d(%s)\n",
1297          errn, safe_strerror(errn) ); */
1298     }
1299   if (!inf->target_is_pushed (ops))
1300     inf->push_target (ops);
1301   target_terminal::init ();
1302
1303   if (current_program_space->exec_bfd () != NULL
1304       || (current_program_space->symfile_object_file != NULL
1305           && current_program_space->symfile_object_file->obfd != NULL))
1306     solib_create_inferior_hook (0);
1307 }
1308
1309 void
1310 nto_procfs_target::interrupt ()
1311 {
1312   devctl (ctl_fd, DCMD_PROC_STOP, NULL, 0, 0);
1313 }
1314
1315 void
1316 nto_procfs_target::kill ()
1317 {
1318   target_mourn_inferior (inferior_ptid);
1319 }
1320
1321 /* Fill buf with regset and return devctl cmd to do the setting.  Return
1322    -1 if we fail to get the regset.  Store size of regset in regsize.  */
1323 static int
1324 get_regset (int regset, char *buf, int bufsize, int *regsize)
1325 {
1326   int dev_get, dev_set;
1327   switch (regset)
1328     {
1329     case NTO_REG_GENERAL:
1330       dev_get = DCMD_PROC_GETGREG;
1331       dev_set = DCMD_PROC_SETGREG;
1332       break;
1333
1334     case NTO_REG_FLOAT:
1335       dev_get = DCMD_PROC_GETFPREG;
1336       dev_set = DCMD_PROC_SETFPREG;
1337       break;
1338
1339     case NTO_REG_ALT:
1340       dev_get = DCMD_PROC_GETALTREG;
1341       dev_set = DCMD_PROC_SETALTREG;
1342       break;
1343
1344     case NTO_REG_SYSTEM:
1345     default:
1346       return -1;
1347     }
1348   if (devctl (ctl_fd, dev_get, buf, bufsize, regsize) != EOK)
1349     return -1;
1350
1351   return dev_set;
1352 }
1353
1354 void
1355 nto_procfs_target::store_registers (struct regcache *regcache, int regno)
1356 {
1357   union
1358   {
1359     procfs_greg greg;
1360     procfs_fpreg fpreg;
1361     procfs_altreg altreg;
1362   }
1363   reg;
1364   unsigned off;
1365   int len, regset, regsize, dev_set, err;
1366   char *data;
1367   ptid_t ptid = regcache->ptid ();
1368
1369   if (ptid == null_ptid)
1370     return;
1371   procfs_set_thread (ptid);
1372
1373   if (regno == -1)
1374     {
1375       for (regset = NTO_REG_GENERAL; regset < NTO_REG_END; regset++)
1376         {
1377           dev_set = get_regset (regset, (char *) &reg,
1378                                 sizeof (reg), &regsize);
1379           if (dev_set == -1)
1380             continue;
1381
1382           if (nto_regset_fill (regcache, regset, (char *) &reg) == -1)
1383             continue;
1384
1385           err = devctl (ctl_fd, dev_set, &reg, regsize, 0);
1386           if (err != EOK)
1387             gdb_printf (gdb_stderr,
1388                         "Warning unable to write regset %d: %s\n",
1389                         regno, safe_strerror (err));
1390         }
1391     }
1392   else
1393     {
1394       regset = nto_regset_id (regno);
1395       if (regset == -1)
1396         return;
1397
1398       dev_set = get_regset (regset, (char *) &reg, sizeof (reg), &regsize);
1399       if (dev_set == -1)
1400         return;
1401
1402       len = nto_register_area (regcache->arch (),
1403                                regno, regset, &off);
1404
1405       if (len < 1)
1406         return;
1407
1408       regcache->raw_collect (regno, (char *) &reg + off);
1409
1410       err = devctl (ctl_fd, dev_set, &reg, regsize, 0);
1411       if (err != EOK)
1412         gdb_printf (gdb_stderr,
1413                     "Warning unable to write regset %d: %s\n", regno,
1414                     safe_strerror (err));
1415     }
1416 }
1417
1418 /* Set list of signals to be handled in the target.  */
1419
1420 void
1421 nto_procfs_target::pass_signals
1422   (gdb::array_view<const unsigned char> pass_signals)
1423 {
1424   int signo;
1425
1426   sigfillset (&run.trace);
1427
1428   for (signo = 1; signo < NSIG; signo++)
1429     {
1430       int target_signo = gdb_signal_from_host (signo);
1431       if (target_signo < pass_signals.size () && pass_signals[target_signo])
1432         sigdelset (&run.trace, signo);
1433     }
1434 }
1435
1436 std::string
1437 nto_procfs_target::pid_to_str (ptid_t ptid)
1438 {
1439   int pid, tid;
1440   struct tidinfo *tip;
1441
1442   pid = ptid.pid ();
1443   tid = ptid.tid ();
1444
1445 #if 0                           /* NYI */
1446   tip = procfs_thread_info (pid, tid);
1447   if (tip != NULL)
1448     snprintf (&buf[n], 1023, " (state = 0x%02x)", tip->state);
1449 #endif
1450
1451   return string_printf ("process %d", pid);
1452 }
1453
1454 /* to_can_run implementation for "target procfs".  Note this really
1455   means "can this target be the default run target", which there can
1456   be only one, and we make it be "target native" like other ports.
1457   "target procfs <node>" wouldn't make sense as default run target, as
1458   it needs <node>.  */
1459
1460 int
1461 nto_procfs_target::can_run ()
1462 {
1463   return 0;
1464 }
1465
1466 /* "target procfs".  */
1467 static nto_procfs_target_procfs nto_procfs_ops;
1468
1469 /* "target native".  */
1470 static nto_procfs_target_native nto_native_ops;
1471
1472 /* Create the "native" and "procfs" targets.  */
1473
1474 static void
1475 init_procfs_targets (void)
1476 {
1477   /* Register "target native".  This is the default run target.  */
1478   add_target (nto_native_target_info, inf_child_open_target);
1479   set_native_target (&nto_native_ops);
1480
1481   /* Register "target procfs <node>".  */
1482   add_target (nto_procfs_target_info, inf_child_open_target);
1483 }
1484
1485 #define OSTYPE_NTO 1
1486
1487 void _initialize_procfs ();
1488 void
1489 _initialize_procfs ()
1490 {
1491   sigset_t set;
1492
1493   init_procfs_targets ();
1494
1495   /* We use SIGUSR1 to gain control after we block waiting for a process.
1496      We use sigwaitevent to wait.  */
1497   sigemptyset (&set);
1498   sigaddset (&set, SIGUSR1);
1499   sigprocmask (SIG_BLOCK, &set, NULL);
1500
1501   /* Initially, make sure all signals are reported.  */
1502   sigfillset (&run.trace);
1503
1504   /* Stuff some information.  */
1505   nto_cpuinfo_flags = SYSPAGE_ENTRY (cpuinfo)->flags;
1506   nto_cpuinfo_valid = 1;
1507
1508   add_info ("pidlist", procfs_pidlist, _("pidlist"));
1509   add_info ("meminfo", procfs_meminfo, _("memory information"));
1510
1511   nto_is_nto_target = procfs_is_nto_target;
1512 }
1513
1514
1515 static int
1516 procfs_hw_watchpoint (int addr, int len, enum target_hw_bp_type type)
1517 {
1518   procfs_break brk;
1519
1520   switch (type)
1521     {
1522     case hw_read:
1523       brk.type = _DEBUG_BREAK_RD;
1524       break;
1525     case hw_access:
1526       brk.type = _DEBUG_BREAK_RW;
1527       break;
1528     default:                    /* Modify.  */
1529 /* FIXME: brk.type = _DEBUG_BREAK_RWM gives EINVAL for some reason.  */
1530       brk.type = _DEBUG_BREAK_RW;
1531     }
1532   brk.type |= _DEBUG_BREAK_HW;  /* Always ask for HW.  */
1533   brk.addr = addr;
1534   brk.size = len;
1535
1536   errno = devctl (ctl_fd, DCMD_PROC_BREAK, &brk, sizeof (brk), 0);
1537   if (errno != EOK)
1538     {
1539       perror (_("Failed to set hardware watchpoint"));
1540       return -1;
1541     }
1542   return 0;
1543 }
1544
1545 bool
1546 nto_procfs_target::can_use_hw_breakpoint (enum bptype type,
1547                                           int cnt, int othertype)
1548 {
1549   return 1;
1550 }
1551
1552 int
1553 nto_procfs_target::remove_hw_watchpoint (CORE_ADDR addr, int len,
1554                                          enum target_hw_bp_type type,
1555                                          struct expression *cond)
1556 {
1557   return procfs_hw_watchpoint (addr, -1, type);
1558 }
1559
1560 int
1561 nto_procfs_target::insert_hw_watchpoint (CORE_ADDR addr, int len,
1562                                          enum target_hw_bp_type type,
1563                                          struct expression *cond)
1564 {
1565   return procfs_hw_watchpoint (addr, len, type);
1566 }
1567
1568 bool
1569 nto_procfs_target::stopped_by_watchpoint ()
1570 {
1571   /* NOTE: nto_stopped_by_watchpoint will be called ONLY while we are
1572      stopped due to a SIGTRAP.  This assumes gdb works in 'all-stop' mode;
1573      future gdb versions will likely run in 'non-stop' mode in which case
1574      we will have to store/examine statuses per thread in question.
1575      Until then, this will work fine.  */
1576
1577   struct inferior *inf = current_inferior ();
1578   struct nto_inferior_data *inf_data;
1579
1580   gdb_assert (inf != NULL);
1581
1582   inf_data = nto_inferior_data (inf);
1583
1584   return inf_data->stopped_flags
1585          & (_DEBUG_FLAG_TRACE_RD
1586             | _DEBUG_FLAG_TRACE_WR
1587             | _DEBUG_FLAG_TRACE_MODIFY);
1588 }