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 "solib-svr4.h"
  24 #include "nbsd-tdep.h"
  25 #include "gdbarch.h"
  26 #include "objfiles.h"
  27
  28 /* FIXME: kettenis/20060115: We should really eliminate the next two
  29    functions completely.  */
  30
  31 struct link_map_offsets *
  32 nbsd_ilp32_solib_svr4_fetch_link_map_offsets (void)
  33 {
  34   return svr4_ilp32_fetch_link_map_offsets ();
  35 }
  36
  37 struct link_map_offsets *
  38 nbsd_lp64_solib_svr4_fetch_link_map_offsets (void)
  39 {
  40   return svr4_lp64_fetch_link_map_offsets ();
  41 }
  42
  43 int
  44 nbsd_pc_in_sigtramp (CORE_ADDR pc, const char *func_name)
  45 {
  46   /* Check for libc-provided signal trampoline.  All such trampolines
  47      have function names which begin with "__sigtramp".  */
  48
  49   return (func_name != NULL
  50           && startswith (func_name, "__sigtramp"));
  51 }
  52
  53 /* This enum is derived from NETBSD's <sys/signal.h>.  */
  54
  55 enum
  56   {
  57    NBSD_SIGHUP = 1,
  58    NBSD_SIGINT = 2,
  59    NBSD_SIGQUIT = 3,
  60    NBSD_SIGILL = 4,
  61    NBSD_SIGTRAP = 5,
  62    NBSD_SIGABRT = 6,
  63    NBSD_SIGEMT = 7,
  64    NBSD_SIGFPE = 8,
  65    NBSD_SIGKILL = 9,
  66    NBSD_SIGBUS = 10,
  67    NBSD_SIGSEGV = 11,
  68    NBSD_SIGSYS = 12,
  69    NBSD_SIGPIPE = 13,
  70    NBSD_SIGALRM = 14,
  71    NBSD_SIGTERM = 15,
  72    NBSD_SIGURG = 16,
  73    NBSD_SIGSTOP = 17,
  74    NBSD_SIGTSTP = 18,
  75    NBSD_SIGCONT = 19,
  76    NBSD_SIGCHLD = 20,
  77    NBSD_SIGTTIN = 21,
  78    NBSD_SIGTTOU = 22,
  79    NBSD_SIGIO = 23,
  80    NBSD_SIGXCPU = 24,
  81    NBSD_SIGXFSZ = 25,
  82    NBSD_SIGVTALRM = 26,
  83    NBSD_SIGPROF = 27,
  84    NBSD_SIGWINCH = 28,
  85    NBSD_SIGINFO = 29,
  86    NBSD_SIGUSR1 = 30,
  87    NBSD_SIGUSR2 = 31,
  88    NBSD_SIGPWR = 32,
  89    NBSD_SIGRTMIN = 33,
  90    NBSD_SIGRTMAX = 63,
  91   };
  92
  93 /* Implement the "gdb_signal_from_target" gdbarch method.  */
  94
  95 static enum gdb_signal
  96 nbsd_gdb_signal_from_target (struct gdbarch *gdbarch, int signal)
  97 {
  98   switch (signal)
  99     {
 100     case 0:
 101       return GDB_SIGNAL_0;
 102
 103     case NBSD_SIGHUP:
 104       return GDB_SIGNAL_HUP;
 105
 106     case NBSD_SIGINT:
 107       return GDB_SIGNAL_INT;
 108
 109     case NBSD_SIGQUIT:
 110       return GDB_SIGNAL_QUIT;
 111
 112     case NBSD_SIGILL:
 113       return GDB_SIGNAL_ILL;
 114
 115     case NBSD_SIGTRAP:
 116       return GDB_SIGNAL_TRAP;
 117
 118     case NBSD_SIGABRT:
 119       return GDB_SIGNAL_ABRT;
 120
 121     case NBSD_SIGEMT:
 122       return GDB_SIGNAL_EMT;
 123
 124     case NBSD_SIGFPE:
 125       return GDB_SIGNAL_FPE;
 126
 127     case NBSD_SIGKILL:
 128       return GDB_SIGNAL_KILL;
 129
 130     case NBSD_SIGBUS:
 131       return GDB_SIGNAL_BUS;
 132
 133     case NBSD_SIGSEGV:
 134       return GDB_SIGNAL_SEGV;
 135
 136     case NBSD_SIGSYS:
 137       return GDB_SIGNAL_SYS;
 138
 139     case NBSD_SIGPIPE:
 140       return GDB_SIGNAL_PIPE;
 141
 142     case NBSD_SIGALRM:
 143       return GDB_SIGNAL_ALRM;
 144
 145     case NBSD_SIGTERM:
 146       return GDB_SIGNAL_TERM;
 147
 148     case NBSD_SIGURG:
 149       return GDB_SIGNAL_URG;
 150
 151     case NBSD_SIGSTOP:
 152       return GDB_SIGNAL_STOP;
 153
 154     case NBSD_SIGTSTP:
 155       return GDB_SIGNAL_TSTP;
 156
 157     case NBSD_SIGCONT:
 158       return GDB_SIGNAL_CONT;
 159
 160     case NBSD_SIGCHLD:
 161       return GDB_SIGNAL_CHLD;
 162
 163     case NBSD_SIGTTIN:
 164       return GDB_SIGNAL_TTIN;
 165
 166     case NBSD_SIGTTOU:
 167       return GDB_SIGNAL_TTOU;
 168
 169     case NBSD_SIGIO:
 170       return GDB_SIGNAL_IO;
 171
 172     case NBSD_SIGXCPU:
 173       return GDB_SIGNAL_XCPU;
 174
 175     case NBSD_SIGXFSZ:
 176       return GDB_SIGNAL_XFSZ;
 177
 178     case NBSD_SIGVTALRM:
 179       return GDB_SIGNAL_VTALRM;
 180
 181     case NBSD_SIGPROF:
 182       return GDB_SIGNAL_PROF;
 183
 184     case NBSD_SIGWINCH:
 185       return GDB_SIGNAL_WINCH;
 186
 187     case NBSD_SIGINFO:
 188       return GDB_SIGNAL_INFO;
 189
 190     case NBSD_SIGUSR1:
 191       return GDB_SIGNAL_USR1;
 192
 193     case NBSD_SIGUSR2:
 194       return GDB_SIGNAL_USR2;
 195
 196     case NBSD_SIGPWR:
 197       return GDB_SIGNAL_PWR;
 198
 199     /* SIGRTMIN and SIGRTMAX are not continuous in <gdb/signals.def>,
 200        therefore we have to handle them here.  */
 201     case NBSD_SIGRTMIN:
 202       return GDB_SIGNAL_REALTIME_33;
 203
 204     case NBSD_SIGRTMAX:
 205       return GDB_SIGNAL_REALTIME_63;
 206     }
 207
 208   if (signal >= NBSD_SIGRTMIN + 1 && signal <= NBSD_SIGRTMAX - 1)
 209     {
 210       int offset = signal - NBSD_SIGRTMIN + 1;
 211
 212       return (enum gdb_signal) ((int) GDB_SIGNAL_REALTIME_34 + offset);
 213     }
 214
 215   return GDB_SIGNAL_UNKNOWN;
 216 }
 217
 218 /* Implement the "gdb_signal_to_target" gdbarch method.  */
 219
 220 static int
 221 nbsd_gdb_signal_to_target (struct gdbarch *gdbarch,
 222                 enum gdb_signal signal)
 223 {
 224   switch (signal)
 225     {
 226     case GDB_SIGNAL_0:
 227       return 0;
 228
 229     case GDB_SIGNAL_HUP:
 230       return NBSD_SIGHUP;
 231
 232     case GDB_SIGNAL_INT:
 233       return NBSD_SIGINT;
 234
 235     case GDB_SIGNAL_QUIT:
 236       return NBSD_SIGQUIT;
 237
 238     case GDB_SIGNAL_ILL:
 239       return NBSD_SIGILL;
 240
 241     case GDB_SIGNAL_TRAP:
 242       return NBSD_SIGTRAP;
 243
 244     case GDB_SIGNAL_ABRT:
 245       return NBSD_SIGABRT;
 246
 247     case GDB_SIGNAL_EMT:
 248       return NBSD_SIGEMT;
 249
 250     case GDB_SIGNAL_FPE:
 251       return NBSD_SIGFPE;
 252
 253     case GDB_SIGNAL_KILL:
 254       return NBSD_SIGKILL;
 255
 256     case GDB_SIGNAL_BUS:
 257       return NBSD_SIGBUS;
 258
 259     case GDB_SIGNAL_SEGV:
 260       return NBSD_SIGSEGV;
 261
 262     case GDB_SIGNAL_SYS:
 263       return NBSD_SIGSYS;
 264
 265     case GDB_SIGNAL_PIPE:
 266       return NBSD_SIGPIPE;
 267
 268     case GDB_SIGNAL_ALRM:
 269       return NBSD_SIGALRM;
 270
 271     case GDB_SIGNAL_TERM:
 272       return NBSD_SIGTERM;
 273
 274     case GDB_SIGNAL_URG:
 275       return NBSD_SIGSTOP;
 276
 277     case GDB_SIGNAL_TSTP:
 278       return NBSD_SIGTSTP;
 279
 280     case GDB_SIGNAL_CONT:
 281       return NBSD_SIGCONT;
 282
 283     case GDB_SIGNAL_CHLD:
 284       return NBSD_SIGCHLD;
 285
 286     case GDB_SIGNAL_TTIN:
 287       return NBSD_SIGTTIN;
 288
 289     case GDB_SIGNAL_TTOU:
 290       return NBSD_SIGTTOU;
 291
 292     case GDB_SIGNAL_IO:
 293       return NBSD_SIGIO;
 294
 295     case GDB_SIGNAL_XCPU:
 296       return NBSD_SIGXCPU;
 297
 298     case GDB_SIGNAL_XFSZ:
 299       return NBSD_SIGXFSZ;
 300
 301     case GDB_SIGNAL_VTALRM:
 302       return NBSD_SIGVTALRM;
 303
 304     case GDB_SIGNAL_PROF:
 305       return NBSD_SIGPROF;
 306
 307     case GDB_SIGNAL_WINCH:
 308       return NBSD_SIGWINCH;
 309
 310     case GDB_SIGNAL_INFO:
 311       return NBSD_SIGINFO;
 312
 313     case GDB_SIGNAL_USR1:
 314       return NBSD_SIGUSR1;
 315
 316     case GDB_SIGNAL_USR2:
 317       return NBSD_SIGUSR2;
 318
 319     case GDB_SIGNAL_PWR:
 320       return NBSD_SIGPWR;
 321
 322     /* GDB_SIGNAL_REALTIME_33 is not continuous in <gdb/signals.def>,
 323        therefore we have to handle it here.  */
 324     case GDB_SIGNAL_REALTIME_33:
 325       return NBSD_SIGRTMIN;
 326
 327     /* Same comment applies to _64.  */
 328     case GDB_SIGNAL_REALTIME_63:
 329       return NBSD_SIGRTMAX;
 330     }
 331
 332   if (signal >= GDB_SIGNAL_REALTIME_34
 333       && signal <= GDB_SIGNAL_REALTIME_62)
 334     {
 335       int offset = signal - GDB_SIGNAL_REALTIME_32;
 336
 337       return NBSD_SIGRTMIN + 1 + offset;
 338     }
 339
 340   return -1;
 341 }
 342
 343 /* Shared library resolver handling.  */
 344
 345 static CORE_ADDR
 346 nbsd_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
 347 {
 348   struct bound_minimal_symbol msym;
 349
 350   msym = lookup_minimal_symbol ("_rtld_bind_start", NULL, NULL);
 351   if (msym.minsym && BMSYMBOL_VALUE_ADDRESS (msym) == pc)
 352     return frame_unwind_caller_pc (get_current_frame ());
 353   else
 354     return find_solib_trampoline_target (get_current_frame (), pc);
 355 }
 356
 357 /* See nbsd-tdep.h.  */
 358
 359 void
 360 nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 361 {
 362   set_gdbarch_gdb_signal_from_target (gdbarch, nbsd_gdb_signal_from_target);
 363   set_gdbarch_gdb_signal_to_target (gdbarch, nbsd_gdb_signal_to_target);
 364   set_gdbarch_skip_solib_resolver (gdbarch, nbsd_skip_solib_resolver);
 365 }