gdb/netbsd-tdep.c

   1 /* Common target-dependent code for NetBSD systems.
   2
   3    Copyright (C) 2002-2024 Free Software Foundation, Inc.
   4
   5    Contributed by Wasabi Systems, Inc.
   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 "auxv.h"
  23 #include "solib-svr4.h"
  24 #include "netbsd-tdep.h"
  25 #include "gdbarch.h"
  26 #include "objfiles.h"
  27 #include "xml-syscall.h"
  28
  29 /* Flags in the 'kve_protection' field in struct kinfo_vmentry.  These
  30    match the KVME_PROT_* constants in <sys/sysctl.h>.  */
  31
  32 #define KINFO_VME_PROT_READ     0x00000001
  33 #define KINFO_VME_PROT_WRITE    0x00000002
  34 #define KINFO_VME_PROT_EXEC     0x00000004
  35
  36 /* Flags in the 'kve_flags' field in struct kinfo_vmentry.  These
  37    match the KVME_FLAG_* constants in <sys/sysctl.h>.  */
  38
  39 #define KINFO_VME_FLAG_COW              0x00000001
  40 #define KINFO_VME_FLAG_NEEDS_COPY       0x00000002
  41 #define KINFO_VME_FLAG_NOCOREDUMP       0x00000004
  42 #define KINFO_VME_FLAG_PAGEABLE         0x00000008
  43 #define KINFO_VME_FLAG_GROWS_UP         0x00000010
  44 #define KINFO_VME_FLAG_GROWS_DOWN       0x00000020
  45
  46 int
  47 nbsd_pc_in_sigtramp (CORE_ADDR pc, const char *func_name)
  48 {
  49   /* Check for libc-provided signal trampoline.  All such trampolines
  50      have function names which begin with "__sigtramp".  */
  51
  52   return (func_name != NULL
  53           && startswith (func_name, "__sigtramp"));
  54 }
  55
  56 /* This enum is derived from NETBSD's <sys/signal.h>.  */
  57
  58 enum
  59   {
  60    NBSD_SIGHUP = 1,
  61    NBSD_SIGINT = 2,
  62    NBSD_SIGQUIT = 3,
  63    NBSD_SIGILL = 4,
  64    NBSD_SIGTRAP = 5,
  65    NBSD_SIGABRT = 6,
  66    NBSD_SIGEMT = 7,
  67    NBSD_SIGFPE = 8,
  68    NBSD_SIGKILL = 9,
  69    NBSD_SIGBUS = 10,
  70    NBSD_SIGSEGV = 11,
  71    NBSD_SIGSYS = 12,
  72    NBSD_SIGPIPE = 13,
  73    NBSD_SIGALRM = 14,
  74    NBSD_SIGTERM = 15,
  75    NBSD_SIGURG = 16,
  76    NBSD_SIGSTOP = 17,
  77    NBSD_SIGTSTP = 18,
  78    NBSD_SIGCONT = 19,
  79    NBSD_SIGCHLD = 20,
  80    NBSD_SIGTTIN = 21,
  81    NBSD_SIGTTOU = 22,
  82    NBSD_SIGIO = 23,
  83    NBSD_SIGXCPU = 24,
  84    NBSD_SIGXFSZ = 25,
  85    NBSD_SIGVTALRM = 26,
  86    NBSD_SIGPROF = 27,
  87    NBSD_SIGWINCH = 28,
  88    NBSD_SIGINFO = 29,
  89    NBSD_SIGUSR1 = 30,
  90    NBSD_SIGUSR2 = 31,
  91    NBSD_SIGPWR = 32,
  92    NBSD_SIGRTMIN = 33,
  93    NBSD_SIGRTMAX = 63,
  94   };
  95
  96 /* Implement the "gdb_signal_from_target" gdbarch method.  */
  97
  98 static enum gdb_signal
  99 nbsd_gdb_signal_from_target (struct gdbarch *gdbarch, int signal)
 100 {
 101   switch (signal)
 102     {
 103     case 0:
 104       return GDB_SIGNAL_0;
 105
 106     case NBSD_SIGHUP:
 107       return GDB_SIGNAL_HUP;
 108
 109     case NBSD_SIGINT:
 110       return GDB_SIGNAL_INT;
 111
 112     case NBSD_SIGQUIT:
 113       return GDB_SIGNAL_QUIT;
 114
 115     case NBSD_SIGILL:
 116       return GDB_SIGNAL_ILL;
 117
 118     case NBSD_SIGTRAP:
 119       return GDB_SIGNAL_TRAP;
 120
 121     case NBSD_SIGABRT:
 122       return GDB_SIGNAL_ABRT;
 123
 124     case NBSD_SIGEMT:
 125       return GDB_SIGNAL_EMT;
 126
 127     case NBSD_SIGFPE:
 128       return GDB_SIGNAL_FPE;
 129
 130     case NBSD_SIGKILL:
 131       return GDB_SIGNAL_KILL;
 132
 133     case NBSD_SIGBUS:
 134       return GDB_SIGNAL_BUS;
 135
 136     case NBSD_SIGSEGV:
 137       return GDB_SIGNAL_SEGV;
 138
 139     case NBSD_SIGSYS:
 140       return GDB_SIGNAL_SYS;
 141
 142     case NBSD_SIGPIPE:
 143       return GDB_SIGNAL_PIPE;
 144
 145     case NBSD_SIGALRM:
 146       return GDB_SIGNAL_ALRM;
 147
 148     case NBSD_SIGTERM:
 149       return GDB_SIGNAL_TERM;
 150
 151     case NBSD_SIGURG:
 152       return GDB_SIGNAL_URG;
 153
 154     case NBSD_SIGSTOP:
 155       return GDB_SIGNAL_STOP;
 156
 157     case NBSD_SIGTSTP:
 158       return GDB_SIGNAL_TSTP;
 159
 160     case NBSD_SIGCONT:
 161       return GDB_SIGNAL_CONT;
 162
 163     case NBSD_SIGCHLD:
 164       return GDB_SIGNAL_CHLD;
 165
 166     case NBSD_SIGTTIN:
 167       return GDB_SIGNAL_TTIN;
 168
 169     case NBSD_SIGTTOU:
 170       return GDB_SIGNAL_TTOU;
 171
 172     case NBSD_SIGIO:
 173       return GDB_SIGNAL_IO;
 174
 175     case NBSD_SIGXCPU:
 176       return GDB_SIGNAL_XCPU;
 177
 178     case NBSD_SIGXFSZ:
 179       return GDB_SIGNAL_XFSZ;
 180
 181     case NBSD_SIGVTALRM:
 182       return GDB_SIGNAL_VTALRM;
 183
 184     case NBSD_SIGPROF:
 185       return GDB_SIGNAL_PROF;
 186
 187     case NBSD_SIGWINCH:
 188       return GDB_SIGNAL_WINCH;
 189
 190     case NBSD_SIGINFO:
 191       return GDB_SIGNAL_INFO;
 192
 193     case NBSD_SIGUSR1:
 194       return GDB_SIGNAL_USR1;
 195
 196     case NBSD_SIGUSR2:
 197       return GDB_SIGNAL_USR2;
 198
 199     case NBSD_SIGPWR:
 200       return GDB_SIGNAL_PWR;
 201
 202     /* SIGRTMIN and SIGRTMAX are not continuous in <gdb/signals.def>,
 203        therefore we have to handle them here.  */
 204     case NBSD_SIGRTMIN:
 205       return GDB_SIGNAL_REALTIME_33;
 206
 207     case NBSD_SIGRTMAX:
 208       return GDB_SIGNAL_REALTIME_63;
 209     }
 210
 211   if (signal >= NBSD_SIGRTMIN + 1 && signal <= NBSD_SIGRTMAX - 1)
 212     {
 213       int offset = signal - NBSD_SIGRTMIN + 1;
 214
 215       return (enum gdb_signal) ((int) GDB_SIGNAL_REALTIME_34 + offset);
 216     }
 217
 218   return GDB_SIGNAL_UNKNOWN;
 219 }
 220
 221 /* Implement the "gdb_signal_to_target" gdbarch method.  */
 222
 223 static int
 224 nbsd_gdb_signal_to_target (struct gdbarch *gdbarch,
 225                 enum gdb_signal signal)
 226 {
 227   switch (signal)
 228     {
 229     case GDB_SIGNAL_0:
 230       return 0;
 231
 232     case GDB_SIGNAL_HUP:
 233       return NBSD_SIGHUP;
 234
 235     case GDB_SIGNAL_INT:
 236       return NBSD_SIGINT;
 237
 238     case GDB_SIGNAL_QUIT:
 239       return NBSD_SIGQUIT;
 240
 241     case GDB_SIGNAL_ILL:
 242       return NBSD_SIGILL;
 243
 244     case GDB_SIGNAL_TRAP:
 245       return NBSD_SIGTRAP;
 246
 247     case GDB_SIGNAL_ABRT:
 248       return NBSD_SIGABRT;
 249
 250     case GDB_SIGNAL_EMT:
 251       return NBSD_SIGEMT;
 252
 253     case GDB_SIGNAL_FPE:
 254       return NBSD_SIGFPE;
 255
 256     case GDB_SIGNAL_KILL:
 257       return NBSD_SIGKILL;
 258
 259     case GDB_SIGNAL_BUS:
 260       return NBSD_SIGBUS;
 261
 262     case GDB_SIGNAL_SEGV:
 263       return NBSD_SIGSEGV;
 264
 265     case GDB_SIGNAL_SYS:
 266       return NBSD_SIGSYS;
 267
 268     case GDB_SIGNAL_PIPE:
 269       return NBSD_SIGPIPE;
 270
 271     case GDB_SIGNAL_ALRM:
 272       return NBSD_SIGALRM;
 273
 274     case GDB_SIGNAL_TERM:
 275       return NBSD_SIGTERM;
 276
 277     case GDB_SIGNAL_URG:
 278       return NBSD_SIGSTOP;
 279
 280     case GDB_SIGNAL_TSTP:
 281       return NBSD_SIGTSTP;
 282
 283     case GDB_SIGNAL_CONT:
 284       return NBSD_SIGCONT;
 285
 286     case GDB_SIGNAL_CHLD:
 287       return NBSD_SIGCHLD;
 288
 289     case GDB_SIGNAL_TTIN:
 290       return NBSD_SIGTTIN;
 291
 292     case GDB_SIGNAL_TTOU:
 293       return NBSD_SIGTTOU;
 294
 295     case GDB_SIGNAL_IO:
 296       return NBSD_SIGIO;
 297
 298     case GDB_SIGNAL_XCPU:
 299       return NBSD_SIGXCPU;
 300
 301     case GDB_SIGNAL_XFSZ:
 302       return NBSD_SIGXFSZ;
 303
 304     case GDB_SIGNAL_VTALRM:
 305       return NBSD_SIGVTALRM;
 306
 307     case GDB_SIGNAL_PROF:
 308       return NBSD_SIGPROF;
 309
 310     case GDB_SIGNAL_WINCH:
 311       return NBSD_SIGWINCH;
 312
 313     case GDB_SIGNAL_INFO:
 314       return NBSD_SIGINFO;
 315
 316     case GDB_SIGNAL_USR1:
 317       return NBSD_SIGUSR1;
 318
 319     case GDB_SIGNAL_USR2:
 320       return NBSD_SIGUSR2;
 321
 322     case GDB_SIGNAL_PWR:
 323       return NBSD_SIGPWR;
 324
 325     /* GDB_SIGNAL_REALTIME_33 is not continuous in <gdb/signals.def>,
 326        therefore we have to handle it here.  */
 327     case GDB_SIGNAL_REALTIME_33:
 328       return NBSD_SIGRTMIN;
 329
 330     /* Same comment applies to _64.  */
 331     case GDB_SIGNAL_REALTIME_63:
 332       return NBSD_SIGRTMAX;
 333     }
 334
 335   if (signal >= GDB_SIGNAL_REALTIME_34
 336       && signal <= GDB_SIGNAL_REALTIME_62)
 337     {
 338       int offset = signal - GDB_SIGNAL_REALTIME_32;
 339
 340       return NBSD_SIGRTMIN + 1 + offset;
 341     }
 342
 343   return -1;
 344 }
 345
 346 /* Shared library resolver handling.  */
 347
 348 static CORE_ADDR
 349 nbsd_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
 350 {
 351   struct bound_minimal_symbol msym;
 352
 353   msym = lookup_minimal_symbol ("_rtld_bind_start", NULL, NULL);
 354   if (msym.minsym && msym.value_address () == pc)
 355     return frame_unwind_caller_pc (get_current_frame ());
 356   else
 357     return find_solib_trampoline_target (get_current_frame (), pc);
 358 }
 359
 360 struct nbsd_gdbarch_data
 361 {
 362   struct type *siginfo_type = nullptr;
 363 };
 364
 365 static const registry<gdbarch>::key<nbsd_gdbarch_data>
 366      nbsd_gdbarch_data_handle;
 367
 368 static struct nbsd_gdbarch_data *
 369 get_nbsd_gdbarch_data (struct gdbarch *gdbarch)
 370 {
 371   struct nbsd_gdbarch_data *result = nbsd_gdbarch_data_handle.get (gdbarch);
 372   if (result == nullptr)
 373     result = nbsd_gdbarch_data_handle.emplace (gdbarch);
 374   return result;
 375 }
 376
 377 /* Implement the "get_siginfo_type" gdbarch method.  */
 378
 379 static struct type *
 380 nbsd_get_siginfo_type (struct gdbarch *gdbarch)
 381 {
 382   nbsd_gdbarch_data *nbsd_gdbarch_data = get_nbsd_gdbarch_data (gdbarch);
 383   if (nbsd_gdbarch_data->siginfo_type != NULL)
 384     return nbsd_gdbarch_data->siginfo_type;
 385
 386   type *char_type = builtin_type (gdbarch)->builtin_char;
 387   type *int_type = builtin_type (gdbarch)->builtin_int;
 388   type *long_type = builtin_type (gdbarch)->builtin_long;
 389
 390   type *void_ptr_type
 391     = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);
 392
 393   type *int32_type = builtin_type (gdbarch)->builtin_int32;
 394   type *uint32_type = builtin_type (gdbarch)->builtin_uint32;
 395   type *uint64_type = builtin_type (gdbarch)->builtin_uint64;
 396
 397   bool lp64 = void_ptr_type->length () == 8;
 398   size_t char_bits = gdbarch_addressable_memory_unit_size (gdbarch) * 8;
 399
 400   /* pid_t */
 401   type_allocator alloc (gdbarch);
 402   type *pid_type = alloc.new_type (TYPE_CODE_TYPEDEF,
 403                                    int32_type->length () * char_bits,
 404                                    "pid_t");
 405   pid_type->set_target_type (int32_type);
 406
 407   /* uid_t */
 408   type *uid_type = alloc.new_type (TYPE_CODE_TYPEDEF,
 409                                    uint32_type->length () * char_bits,
 410                                    "uid_t");
 411   uid_type->set_target_type (uint32_type);
 412
 413   /* clock_t */
 414   type *clock_type = alloc.new_type (TYPE_CODE_TYPEDEF,
 415                                      int_type->length () * char_bits,
 416                                      "clock_t");
 417   clock_type->set_target_type (int_type);
 418
 419   /* lwpid_t */
 420   type *lwpid_type = alloc.new_type (TYPE_CODE_TYPEDEF,
 421                                      int32_type->length () * char_bits,
 422                                      "lwpid_t");
 423   lwpid_type->set_target_type (int32_type);
 424
 425   /* union sigval */
 426   type *sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
 427   sigval_type->set_name (gdbarch_obstack_strdup (gdbarch, "sigval"));
 428   append_composite_type_field (sigval_type, "sival_int", int_type);
 429   append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type);
 430
 431   /* union _option */
 432   type *option_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
 433   option_type->set_name (gdbarch_obstack_strdup (gdbarch, "_option"));
 434   append_composite_type_field (option_type, "_pe_other_pid", pid_type);
 435   append_composite_type_field (option_type, "_pe_lwp", lwpid_type);
 436
 437   /* union _reason */
 438   type *reason_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
 439
 440   /* _rt */
 441   type *t = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 442   append_composite_type_field (t, "_pid", pid_type);
 443   append_composite_type_field (t, "_uid", uid_type);
 444   append_composite_type_field (t, "_value", sigval_type);
 445   append_composite_type_field (reason_type, "_rt", t);
 446
 447   /* _child */
 448   t = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 449   append_composite_type_field (t, "_pid", pid_type);
 450   append_composite_type_field (t, "_uid", uid_type);
 451   append_composite_type_field (t, "_status", int_type);
 452   append_composite_type_field (t, "_utime", clock_type);
 453   append_composite_type_field (t, "_stime", clock_type);
 454   append_composite_type_field (reason_type, "_child", t);
 455
 456   /* _fault */
 457   t = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 458   append_composite_type_field (t, "_addr", void_ptr_type);
 459   append_composite_type_field (t, "_trap", int_type);
 460   append_composite_type_field (t, "_trap2", int_type);
 461   append_composite_type_field (t, "_trap3", int_type);
 462   append_composite_type_field (reason_type, "_fault", t);
 463
 464   /* _poll */
 465   t = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 466   append_composite_type_field (t, "_band", long_type);
 467   append_composite_type_field (t, "_fd", int_type);
 468   append_composite_type_field (reason_type, "_poll", t);
 469
 470   /* _syscall */
 471   t = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 472   append_composite_type_field (t, "_sysnum", int_type);
 473   append_composite_type_field (t, "_retval",
 474                                init_vector_type (int_type, 2));
 475   append_composite_type_field (t, "_error", int_type);
 476   append_composite_type_field (t, "_args",
 477                                init_vector_type (uint64_type, 8));
 478   append_composite_type_field (reason_type, "_syscall", t);
 479
 480   /* _ptrace_state */
 481   t = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 482   append_composite_type_field (t, "_pe_report_event", int_type);
 483   append_composite_type_field (t, "_option", option_type);
 484   append_composite_type_field (reason_type, "_ptrace_state", t);
 485
 486   /* struct _ksiginfo */
 487   type *ksiginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 488   ksiginfo_type->set_name (gdbarch_obstack_strdup (gdbarch, "_ksiginfo"));
 489   append_composite_type_field (ksiginfo_type, "_signo", int_type);
 490   append_composite_type_field (ksiginfo_type, "_code", int_type);
 491   append_composite_type_field (ksiginfo_type, "_errno", int_type);
 492   if (lp64)
 493     append_composite_type_field (ksiginfo_type, "_pad", int_type);
 494   append_composite_type_field (ksiginfo_type, "_reason", reason_type);
 495
 496   /* union siginfo */
 497   type *siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
 498   siginfo_type->set_name (gdbarch_obstack_strdup (gdbarch, "siginfo"));
 499   append_composite_type_field (siginfo_type, "si_pad",
 500                                init_vector_type (char_type, 128));
 501   append_composite_type_field (siginfo_type, "_info", ksiginfo_type);
 502
 503   nbsd_gdbarch_data->siginfo_type = siginfo_type;
 504
 505   return siginfo_type;
 506 }
 507
 508 /* See netbsd-tdep.h.  */
 509
 510 void
 511 nbsd_info_proc_mappings_header (int addr_bit)
 512 {
 513   gdb_printf (_("Mapped address spaces:\n\n"));
 514   if (addr_bit == 64)
 515     {
 516       gdb_printf ("  %18s %18s %10s %10s %9s %s\n",
 517                   "Start Addr",
 518                   "  End Addr",
 519                   "      Size", "    Offset", "Flags  ", "File");
 520     }
 521   else
 522     {
 523       gdb_printf ("\t%10s %10s %10s %10s %9s %s\n",
 524                   "Start Addr",
 525                   "  End Addr",
 526                   "      Size", "    Offset", "Flags  ", "File");
 527     }
 528 }
 529
 530 /* Helper function to generate mappings flags for a single VM map
 531    entry in 'info proc mappings'.  */
 532
 533 static const char *
 534 nbsd_vm_map_entry_flags (int kve_flags, int kve_protection)
 535 {
 536   static char vm_flags[9];
 537
 538   vm_flags[0] = (kve_protection & KINFO_VME_PROT_READ) ? 'r' : '-';
 539   vm_flags[1] = (kve_protection & KINFO_VME_PROT_WRITE) ? 'w' : '-';
 540   vm_flags[2] = (kve_protection & KINFO_VME_PROT_EXEC) ? 'x' : '-';
 541   vm_flags[3] = ' ';
 542   vm_flags[4] = (kve_flags & KINFO_VME_FLAG_COW) ? 'C' : '-';
 543   vm_flags[5] = (kve_flags & KINFO_VME_FLAG_NEEDS_COPY) ? 'N' : '-';
 544   vm_flags[6] = (kve_flags & KINFO_VME_FLAG_PAGEABLE) ? 'P' : '-';
 545   vm_flags[7] = (kve_flags & KINFO_VME_FLAG_GROWS_UP) ? 'U'
 546     : (kve_flags & KINFO_VME_FLAG_GROWS_DOWN) ? 'D' : '-';
 547   vm_flags[8] = '\0';
 548
 549   return vm_flags;
 550 }
 551
 552 void
 553 nbsd_info_proc_mappings_entry (int addr_bit, ULONGEST kve_start,
 554                                ULONGEST kve_end, ULONGEST kve_offset,
 555                                int kve_flags, int kve_protection,
 556                                const char *kve_path)
 557 {
 558   if (addr_bit == 64)
 559     {
 560       gdb_printf ("  %18s %18s %10s %10s %9s %s\n",
 561                   hex_string (kve_start),
 562                   hex_string (kve_end),
 563                   hex_string (kve_end - kve_start),
 564                   hex_string (kve_offset),
 565                   nbsd_vm_map_entry_flags (kve_flags, kve_protection),
 566                   kve_path);
 567     }
 568   else
 569     {
 570       gdb_printf ("\t%10s %10s %10s %10s %9s %s\n",
 571                   hex_string (kve_start),
 572                   hex_string (kve_end),
 573                   hex_string (kve_end - kve_start),
 574                   hex_string (kve_offset),
 575                   nbsd_vm_map_entry_flags (kve_flags, kve_protection),
 576                   kve_path);
 577     }
 578 }
 579
 580 /* Implement the "get_syscall_number" gdbarch method.  */
 581
 582 static LONGEST
 583 nbsd_get_syscall_number (struct gdbarch *gdbarch, thread_info *thread)
 584 {
 585
 586   /* NetBSD doesn't use gdbarch_get_syscall_number since NetBSD
 587      native targets fetch the system call number from the
 588      'si_sysnum' member of siginfo_t in nbsd_nat_target::wait.
 589      However, system call catching requires this function to be
 590      set.  */
 591
 592   internal_error (_("nbsd_get_sycall_number called"));
 593 }
 594
 595 /* See netbsd-tdep.h.  */
 596
 597 void
 598 nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 599 {
 600   set_gdbarch_gdb_signal_from_target (gdbarch, nbsd_gdb_signal_from_target);
 601   set_gdbarch_gdb_signal_to_target (gdbarch, nbsd_gdb_signal_to_target);
 602   set_gdbarch_skip_solib_resolver (gdbarch, nbsd_skip_solib_resolver);
 603   set_gdbarch_auxv_parse (gdbarch, svr4_auxv_parse);
 604   set_gdbarch_get_siginfo_type (gdbarch, nbsd_get_siginfo_type);
 605
 606   /* `catch syscall' */
 607   set_xml_syscall_file_name (gdbarch, "syscalls/netbsd.xml");
 608   set_gdbarch_get_syscall_number (gdbarch, nbsd_get_syscall_number);
 609 }