gdb/nbsd-tdep.c

   1 /* Common target-dependent code for NetBSD systems.
   2
   3    Copyright (C) 2002-2020 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 "defs.h"
  23 #include "auxv.h"
  24 #include "solib-svr4.h"
  25 #include "nbsd-tdep.h"
  26 #include "gdbarch.h"
  27 #include "objfiles.h"
  28 #include "xml-syscall.h"
  29
  30 /* Flags in the 'kve_protection' field in struct kinfo_vmentry.  These
  31    match the KVME_PROT_* constants in <sys/sysctl.h>.  */
  32
  33 #define KINFO_VME_PROT_READ     0x00000001
  34 #define KINFO_VME_PROT_WRITE    0x00000002
  35 #define KINFO_VME_PROT_EXEC     0x00000004
  36
  37 /* Flags in the 'kve_flags' field in struct kinfo_vmentry.  These
  38    match the KVME_FLAG_* constants in <sys/sysctl.h>.  */
  39
  40 #define KINFO_VME_FLAG_COW              0x00000001
  41 #define KINFO_VME_FLAG_NEEDS_COPY       0x00000002
  42 #define KINFO_VME_FLAG_NOCOREDUMP       0x00000004
  43 #define KINFO_VME_FLAG_PAGEABLE         0x00000008
  44 #define KINFO_VME_FLAG_GROWS_UP         0x00000010
  45 #define KINFO_VME_FLAG_GROWS_DOWN       0x00000020
  46
  47 /* FIXME: kettenis/20060115: We should really eliminate the next two
  48    functions completely.  */
  49
  50 struct link_map_offsets *
  51 nbsd_ilp32_solib_svr4_fetch_link_map_offsets (void)
  52 {
  53   return svr4_ilp32_fetch_link_map_offsets ();
  54 }
  55
  56 struct link_map_offsets *
  57 nbsd_lp64_solib_svr4_fetch_link_map_offsets (void)
  58 {
  59   return svr4_lp64_fetch_link_map_offsets ();
  60 }
  61
  62 int
  63 nbsd_pc_in_sigtramp (CORE_ADDR pc, const char *func_name)
  64 {
  65   /* Check for libc-provided signal trampoline.  All such trampolines
  66      have function names which begin with "__sigtramp".  */
  67
  68   return (func_name != NULL
  69           && startswith (func_name, "__sigtramp"));
  70 }
  71
  72 /* This enum is derived from NETBSD's <sys/signal.h>.  */
  73
  74 enum
  75   {
  76    NBSD_SIGHUP = 1,
  77    NBSD_SIGINT = 2,
  78    NBSD_SIGQUIT = 3,
  79    NBSD_SIGILL = 4,
  80    NBSD_SIGTRAP = 5,
  81    NBSD_SIGABRT = 6,
  82    NBSD_SIGEMT = 7,
  83    NBSD_SIGFPE = 8,
  84    NBSD_SIGKILL = 9,
  85    NBSD_SIGBUS = 10,
  86    NBSD_SIGSEGV = 11,
  87    NBSD_SIGSYS = 12,
  88    NBSD_SIGPIPE = 13,
  89    NBSD_SIGALRM = 14,
  90    NBSD_SIGTERM = 15,
  91    NBSD_SIGURG = 16,
  92    NBSD_SIGSTOP = 17,
  93    NBSD_SIGTSTP = 18,
  94    NBSD_SIGCONT = 19,
  95    NBSD_SIGCHLD = 20,
  96    NBSD_SIGTTIN = 21,
  97    NBSD_SIGTTOU = 22,
  98    NBSD_SIGIO = 23,
  99    NBSD_SIGXCPU = 24,
 100    NBSD_SIGXFSZ = 25,
 101    NBSD_SIGVTALRM = 26,
 102    NBSD_SIGPROF = 27,
 103    NBSD_SIGWINCH = 28,
 104    NBSD_SIGINFO = 29,
 105    NBSD_SIGUSR1 = 30,
 106    NBSD_SIGUSR2 = 31,
 107    NBSD_SIGPWR = 32,
 108    NBSD_SIGRTMIN = 33,
 109    NBSD_SIGRTMAX = 63,
 110   };
 111
 112 /* Implement the "gdb_signal_from_target" gdbarch method.  */
 113
 114 static enum gdb_signal
 115 nbsd_gdb_signal_from_target (struct gdbarch *gdbarch, int signal)
 116 {
 117   switch (signal)
 118     {
 119     case 0:
 120       return GDB_SIGNAL_0;
 121
 122     case NBSD_SIGHUP:
 123       return GDB_SIGNAL_HUP;
 124
 125     case NBSD_SIGINT:
 126       return GDB_SIGNAL_INT;
 127
 128     case NBSD_SIGQUIT:
 129       return GDB_SIGNAL_QUIT;
 130
 131     case NBSD_SIGILL:
 132       return GDB_SIGNAL_ILL;
 133
 134     case NBSD_SIGTRAP:
 135       return GDB_SIGNAL_TRAP;
 136
 137     case NBSD_SIGABRT:
 138       return GDB_SIGNAL_ABRT;
 139
 140     case NBSD_SIGEMT:
 141       return GDB_SIGNAL_EMT;
 142
 143     case NBSD_SIGFPE:
 144       return GDB_SIGNAL_FPE;
 145
 146     case NBSD_SIGKILL:
 147       return GDB_SIGNAL_KILL;
 148
 149     case NBSD_SIGBUS:
 150       return GDB_SIGNAL_BUS;
 151
 152     case NBSD_SIGSEGV:
 153       return GDB_SIGNAL_SEGV;
 154
 155     case NBSD_SIGSYS:
 156       return GDB_SIGNAL_SYS;
 157
 158     case NBSD_SIGPIPE:
 159       return GDB_SIGNAL_PIPE;
 160
 161     case NBSD_SIGALRM:
 162       return GDB_SIGNAL_ALRM;
 163
 164     case NBSD_SIGTERM:
 165       return GDB_SIGNAL_TERM;
 166
 167     case NBSD_SIGURG:
 168       return GDB_SIGNAL_URG;
 169
 170     case NBSD_SIGSTOP:
 171       return GDB_SIGNAL_STOP;
 172
 173     case NBSD_SIGTSTP:
 174       return GDB_SIGNAL_TSTP;
 175
 176     case NBSD_SIGCONT:
 177       return GDB_SIGNAL_CONT;
 178
 179     case NBSD_SIGCHLD:
 180       return GDB_SIGNAL_CHLD;
 181
 182     case NBSD_SIGTTIN:
 183       return GDB_SIGNAL_TTIN;
 184
 185     case NBSD_SIGTTOU:
 186       return GDB_SIGNAL_TTOU;
 187
 188     case NBSD_SIGIO:
 189       return GDB_SIGNAL_IO;
 190
 191     case NBSD_SIGXCPU:
 192       return GDB_SIGNAL_XCPU;
 193
 194     case NBSD_SIGXFSZ:
 195       return GDB_SIGNAL_XFSZ;
 196
 197     case NBSD_SIGVTALRM:
 198       return GDB_SIGNAL_VTALRM;
 199
 200     case NBSD_SIGPROF:
 201       return GDB_SIGNAL_PROF;
 202
 203     case NBSD_SIGWINCH:
 204       return GDB_SIGNAL_WINCH;
 205
 206     case NBSD_SIGINFO:
 207       return GDB_SIGNAL_INFO;
 208
 209     case NBSD_SIGUSR1:
 210       return GDB_SIGNAL_USR1;
 211
 212     case NBSD_SIGUSR2:
 213       return GDB_SIGNAL_USR2;
 214
 215     case NBSD_SIGPWR:
 216       return GDB_SIGNAL_PWR;
 217
 218     /* SIGRTMIN and SIGRTMAX are not continuous in <gdb/signals.def>,
 219        therefore we have to handle them here.  */
 220     case NBSD_SIGRTMIN:
 221       return GDB_SIGNAL_REALTIME_33;
 222
 223     case NBSD_SIGRTMAX:
 224       return GDB_SIGNAL_REALTIME_63;
 225     }
 226
 227   if (signal >= NBSD_SIGRTMIN + 1 && signal <= NBSD_SIGRTMAX - 1)
 228     {
 229       int offset = signal - NBSD_SIGRTMIN + 1;
 230
 231       return (enum gdb_signal) ((int) GDB_SIGNAL_REALTIME_34 + offset);
 232     }
 233
 234   return GDB_SIGNAL_UNKNOWN;
 235 }
 236
 237 /* Implement the "gdb_signal_to_target" gdbarch method.  */
 238
 239 static int
 240 nbsd_gdb_signal_to_target (struct gdbarch *gdbarch,
 241                 enum gdb_signal signal)
 242 {
 243   switch (signal)
 244     {
 245     case GDB_SIGNAL_0:
 246       return 0;
 247
 248     case GDB_SIGNAL_HUP:
 249       return NBSD_SIGHUP;
 250
 251     case GDB_SIGNAL_INT:
 252       return NBSD_SIGINT;
 253
 254     case GDB_SIGNAL_QUIT:
 255       return NBSD_SIGQUIT;
 256
 257     case GDB_SIGNAL_ILL:
 258       return NBSD_SIGILL;
 259
 260     case GDB_SIGNAL_TRAP:
 261       return NBSD_SIGTRAP;
 262
 263     case GDB_SIGNAL_ABRT:
 264       return NBSD_SIGABRT;
 265
 266     case GDB_SIGNAL_EMT:
 267       return NBSD_SIGEMT;
 268
 269     case GDB_SIGNAL_FPE:
 270       return NBSD_SIGFPE;
 271
 272     case GDB_SIGNAL_KILL:
 273       return NBSD_SIGKILL;
 274
 275     case GDB_SIGNAL_BUS:
 276       return NBSD_SIGBUS;
 277
 278     case GDB_SIGNAL_SEGV:
 279       return NBSD_SIGSEGV;
 280
 281     case GDB_SIGNAL_SYS:
 282       return NBSD_SIGSYS;
 283
 284     case GDB_SIGNAL_PIPE:
 285       return NBSD_SIGPIPE;
 286
 287     case GDB_SIGNAL_ALRM:
 288       return NBSD_SIGALRM;
 289
 290     case GDB_SIGNAL_TERM:
 291       return NBSD_SIGTERM;
 292
 293     case GDB_SIGNAL_URG:
 294       return NBSD_SIGSTOP;
 295
 296     case GDB_SIGNAL_TSTP:
 297       return NBSD_SIGTSTP;
 298
 299     case GDB_SIGNAL_CONT:
 300       return NBSD_SIGCONT;
 301
 302     case GDB_SIGNAL_CHLD:
 303       return NBSD_SIGCHLD;
 304
 305     case GDB_SIGNAL_TTIN:
 306       return NBSD_SIGTTIN;
 307
 308     case GDB_SIGNAL_TTOU:
 309       return NBSD_SIGTTOU;
 310
 311     case GDB_SIGNAL_IO:
 312       return NBSD_SIGIO;
 313
 314     case GDB_SIGNAL_XCPU:
 315       return NBSD_SIGXCPU;
 316
 317     case GDB_SIGNAL_XFSZ:
 318       return NBSD_SIGXFSZ;
 319
 320     case GDB_SIGNAL_VTALRM:
 321       return NBSD_SIGVTALRM;
 322
 323     case GDB_SIGNAL_PROF:
 324       return NBSD_SIGPROF;
 325
 326     case GDB_SIGNAL_WINCH:
 327       return NBSD_SIGWINCH;
 328
 329     case GDB_SIGNAL_INFO:
 330       return NBSD_SIGINFO;
 331
 332     case GDB_SIGNAL_USR1:
 333       return NBSD_SIGUSR1;
 334
 335     case GDB_SIGNAL_USR2:
 336       return NBSD_SIGUSR2;
 337
 338     case GDB_SIGNAL_PWR:
 339       return NBSD_SIGPWR;
 340
 341     /* GDB_SIGNAL_REALTIME_33 is not continuous in <gdb/signals.def>,
 342        therefore we have to handle it here.  */
 343     case GDB_SIGNAL_REALTIME_33:
 344       return NBSD_SIGRTMIN;
 345
 346     /* Same comment applies to _64.  */
 347     case GDB_SIGNAL_REALTIME_63:
 348       return NBSD_SIGRTMAX;
 349     }
 350
 351   if (signal >= GDB_SIGNAL_REALTIME_34
 352       && signal <= GDB_SIGNAL_REALTIME_62)
 353     {
 354       int offset = signal - GDB_SIGNAL_REALTIME_32;
 355
 356       return NBSD_SIGRTMIN + 1 + offset;
 357     }
 358
 359   return -1;
 360 }
 361
 362 /* Shared library resolver handling.  */
 363
 364 static CORE_ADDR
 365 nbsd_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
 366 {
 367   struct bound_minimal_symbol msym;
 368
 369   msym = lookup_minimal_symbol ("_rtld_bind_start", NULL, NULL);
 370   if (msym.minsym && BMSYMBOL_VALUE_ADDRESS (msym) == pc)
 371     return frame_unwind_caller_pc (get_current_frame ());
 372   else
 373     return find_solib_trampoline_target (get_current_frame (), pc);
 374 }
 375
 376 /* See nbsd-tdep.h.  */
 377
 378 void
 379 nbsd_info_proc_mappings_header (int addr_bit)
 380 {
 381   printf_filtered (_("Mapped address spaces:\n\n"));
 382   if (addr_bit == 64)
 383     {
 384       printf_filtered ("  %18s %18s %10s %10s %9s %s\n",
 385                        "Start Addr",
 386                        "  End Addr",
 387                        "      Size", "    Offset", "Flags  ", "File");
 388     }
 389   else
 390     {
 391       printf_filtered ("\t%10s %10s %10s %10s %9s %s\n",
 392                        "Start Addr",
 393                        "  End Addr",
 394                        "      Size", "    Offset", "Flags  ", "File");
 395     }
 396 }
 397
 398 /* Helper function to generate mappings flags for a single VM map
 399    entry in 'info proc mappings'.  */
 400
 401 static const char *
 402 nbsd_vm_map_entry_flags (int kve_flags, int kve_protection)
 403 {
 404   static char vm_flags[9];
 405
 406   vm_flags[0] = (kve_protection & KINFO_VME_PROT_READ) ? 'r' : '-';
 407   vm_flags[1] = (kve_protection & KINFO_VME_PROT_WRITE) ? 'w' : '-';
 408   vm_flags[2] = (kve_protection & KINFO_VME_PROT_EXEC) ? 'x' : '-';
 409   vm_flags[3] = ' ';
 410   vm_flags[4] = (kve_flags & KINFO_VME_FLAG_COW) ? 'C' : '-';
 411   vm_flags[5] = (kve_flags & KINFO_VME_FLAG_NEEDS_COPY) ? 'N' : '-';
 412   vm_flags[6] = (kve_flags & KINFO_VME_FLAG_PAGEABLE) ? 'P' : '-';
 413   vm_flags[7] = (kve_flags & KINFO_VME_FLAG_GROWS_UP) ? 'U'
 414     : (kve_flags & KINFO_VME_FLAG_GROWS_DOWN) ? 'D' : '-';
 415   vm_flags[8] = '\0';
 416
 417   return vm_flags;
 418 }
 419
 420 void
 421 nbsd_info_proc_mappings_entry (int addr_bit, ULONGEST kve_start,
 422                                ULONGEST kve_end, ULONGEST kve_offset,
 423                                int kve_flags, int kve_protection,
 424                                const char *kve_path)
 425 {
 426   if (addr_bit == 64)
 427     {
 428       printf_filtered ("  %18s %18s %10s %10s %9s %s\n",
 429                        hex_string (kve_start),
 430                        hex_string (kve_end),
 431                        hex_string (kve_end - kve_start),
 432                        hex_string (kve_offset),
 433                        nbsd_vm_map_entry_flags (kve_flags, kve_protection),
 434                        kve_path);
 435     }
 436   else
 437     {
 438       printf_filtered ("\t%10s %10s %10s %10s %9s %s\n",
 439                        hex_string (kve_start),
 440                        hex_string (kve_end),
 441                        hex_string (kve_end - kve_start),
 442                        hex_string (kve_offset),
 443                        nbsd_vm_map_entry_flags (kve_flags, kve_protection),
 444                        kve_path);
 445     }
 446 }
 447
 448 /* Implement the "get_syscall_number" gdbarch method.  */
 449
 450 static LONGEST
 451 nbsd_get_syscall_number (struct gdbarch *gdbarch, thread_info *thread)
 452 {
 453
 454   /* NetBSD doesn't use gdbarch_get_syscall_number since NetBSD
 455      native targets fetch the system call number from the
 456      'si_sysnum' member of siginfo_t in nbsd_nat_target::wait.
 457      However, system call catching requires this function to be
 458      set.  */
 459
 460   internal_error (__FILE__, __LINE__, _("nbsd_get_sycall_number called"));
 461 }
 462
 463 /* See nbsd-tdep.h.  */
 464
 465 void
 466 nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 467 {
 468   set_gdbarch_gdb_signal_from_target (gdbarch, nbsd_gdb_signal_from_target);
 469   set_gdbarch_gdb_signal_to_target (gdbarch, nbsd_gdb_signal_to_target);
 470   set_gdbarch_skip_solib_resolver (gdbarch, nbsd_skip_solib_resolver);
 471   set_gdbarch_auxv_parse (gdbarch, svr4_auxv_parse);
 472
 473   /* `catch syscall' */
 474   set_xml_syscall_file_name (gdbarch, "syscalls/netbsd.xml");
 475   set_gdbarch_get_syscall_number (gdbarch, nbsd_get_syscall_number);
 476 }