gdb/obsd-tdep.c

   1 /* Target-dependent code for OpenBSD.
   2
   3    Copyright (C) 2005-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "symtab.h"
  23 #include "objfiles.h"
  24
  25 #include "obsd-tdep.h"
  26
  27 CORE_ADDR
  28 obsd_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
  29 {
  30   struct bound_minimal_symbol msym;
  31
  32   msym = lookup_minimal_symbol("_dl_bind", NULL, NULL);
  33   if (msym.minsym && BMSYMBOL_VALUE_ADDRESS (msym) == pc)
  34     return frame_unwind_caller_pc (get_current_frame ());
  35   else
  36     return find_solib_trampoline_target (get_current_frame (), pc);
  37 }
  38
  39 /* OpenBSD signal numbers.  From <sys/signal.h>. */
  40
  41 enum
  42   {
  43     OBSD_SIGHUP = 1,
  44     OBSD_SIGINT = 2,
  45     OBSD_SIGQUIT = 3,
  46     OBSD_SIGILL = 4,
  47     OBSD_SIGTRAP = 5,
  48     OBSD_SIGABRT = 6,
  49     OBSD_SIGEMT = 7,
  50     OBSD_SIGFPE = 8,
  51     OBSD_SIGKILL = 9,
  52     OBSD_SIGBUS = 10,
  53     OBSD_SIGSEGV = 11,
  54     OBSD_SIGSYS = 12,
  55     OBSD_SIGPIPE = 13,
  56     OBSD_SIGALRM = 14,
  57     OBSD_SIGTERM = 15,
  58     OBSD_SIGURG = 16,
  59     OBSD_SIGSTOP = 17,
  60     OBSD_SIGTSTP = 18,
  61     OBSD_SIGCONT = 19,
  62     OBSD_SIGCHLD = 20,
  63     OBSD_SIGTTIN = 21,
  64     OBSD_SIGTTOU = 22,
  65     OBSD_SIGIO = 23,
  66     OBSD_SIGXCPU = 24,
  67     OBSD_SIGXFSZ = 25,
  68     OBSD_SIGVTALRM = 26,
  69     OBSD_SIGPROF = 27,
  70     OBSD_SIGWINCH = 28,
  71     OBSD_SIGINFO = 29,
  72     OBSD_SIGUSR1 = 30,
  73     OBSD_SIGUSR2 = 31,
  74     OBSD_SIGTHR = 32,
  75   };
  76
  77 /* Implement the "gdb_signal_from_target" gdbarch method.  */
  78
  79 static enum gdb_signal
  80 obsd_gdb_signal_from_target (struct gdbarch *gdbarch, int signal)
  81 {
  82   switch (signal)
  83     {
  84     case 0:
  85       return GDB_SIGNAL_0;
  86
  87     case OBSD_SIGHUP:
  88       return GDB_SIGNAL_HUP;
  89
  90     case OBSD_SIGINT:
  91       return GDB_SIGNAL_INT;
  92
  93     case OBSD_SIGQUIT:
  94       return GDB_SIGNAL_QUIT;
  95
  96     case OBSD_SIGILL:
  97       return GDB_SIGNAL_ILL;
  98
  99     case OBSD_SIGTRAP:
 100       return GDB_SIGNAL_TRAP;
 101
 102     case OBSD_SIGABRT:
 103       return GDB_SIGNAL_ABRT;
 104
 105     case OBSD_SIGEMT:
 106       return GDB_SIGNAL_EMT;
 107
 108     case OBSD_SIGFPE:
 109       return GDB_SIGNAL_FPE;
 110
 111     case OBSD_SIGKILL:
 112       return GDB_SIGNAL_KILL;
 113
 114     case OBSD_SIGBUS:
 115       return GDB_SIGNAL_BUS;
 116
 117     case OBSD_SIGSEGV:
 118       return GDB_SIGNAL_SEGV;
 119
 120     case OBSD_SIGSYS:
 121       return GDB_SIGNAL_SYS;
 122
 123     case OBSD_SIGPIPE:
 124       return GDB_SIGNAL_PIPE;
 125
 126     case OBSD_SIGALRM:
 127       return GDB_SIGNAL_ALRM;
 128
 129     case OBSD_SIGTERM:
 130       return GDB_SIGNAL_TERM;
 131
 132     case OBSD_SIGURG:
 133       return GDB_SIGNAL_URG;
 134
 135     case OBSD_SIGSTOP:
 136       return GDB_SIGNAL_STOP;
 137
 138     case OBSD_SIGTSTP:
 139       return GDB_SIGNAL_TSTP;
 140
 141     case OBSD_SIGCONT:
 142       return GDB_SIGNAL_CONT;
 143
 144     case OBSD_SIGCHLD:
 145       return GDB_SIGNAL_CHLD;
 146
 147     case OBSD_SIGTTIN:
 148       return GDB_SIGNAL_TTIN;
 149
 150     case OBSD_SIGTTOU:
 151       return GDB_SIGNAL_TTOU;
 152
 153     case OBSD_SIGIO:
 154       return GDB_SIGNAL_IO;
 155
 156     case OBSD_SIGXCPU:
 157       return GDB_SIGNAL_XCPU;
 158
 159     case OBSD_SIGXFSZ:
 160       return GDB_SIGNAL_XFSZ;
 161
 162     case OBSD_SIGVTALRM:
 163       return GDB_SIGNAL_VTALRM;
 164
 165     case OBSD_SIGPROF:
 166       return GDB_SIGNAL_PROF;
 167
 168     case OBSD_SIGWINCH:
 169       return GDB_SIGNAL_WINCH;
 170
 171     case OBSD_SIGINFO:
 172       return GDB_SIGNAL_INFO;
 173
 174     case OBSD_SIGUSR1:
 175       return GDB_SIGNAL_USR1;
 176
 177     case OBSD_SIGUSR2:
 178       return GDB_SIGNAL_USR2;
 179     }
 180
 181   return GDB_SIGNAL_UNKNOWN;
 182 }
 183
 184 /* Implement the "gdb_signal_to_target" gdbarch method.  */
 185
 186 static int
 187 obsd_gdb_signal_to_target (struct gdbarch *gdbarch,
 188                            enum gdb_signal signal)
 189 {
 190   switch (signal)
 191     {
 192     case GDB_SIGNAL_0:
 193       return 0;
 194
 195     case GDB_SIGNAL_HUP:
 196       return OBSD_SIGHUP;
 197
 198     case GDB_SIGNAL_INT:
 199       return OBSD_SIGINT;
 200
 201     case GDB_SIGNAL_QUIT:
 202       return OBSD_SIGQUIT;
 203
 204     case GDB_SIGNAL_ILL:
 205       return OBSD_SIGILL;
 206
 207     case GDB_SIGNAL_TRAP:
 208       return OBSD_SIGTRAP;
 209
 210     case GDB_SIGNAL_ABRT:
 211       return OBSD_SIGABRT;
 212
 213     case GDB_SIGNAL_EMT:
 214       return OBSD_SIGEMT;
 215
 216     case GDB_SIGNAL_FPE:
 217       return OBSD_SIGFPE;
 218
 219     case GDB_SIGNAL_KILL:
 220       return OBSD_SIGKILL;
 221
 222     case GDB_SIGNAL_BUS:
 223       return OBSD_SIGBUS;
 224
 225     case GDB_SIGNAL_SEGV:
 226       return OBSD_SIGSEGV;
 227
 228     case GDB_SIGNAL_SYS:
 229       return OBSD_SIGSYS;
 230
 231     case GDB_SIGNAL_PIPE:
 232       return OBSD_SIGPIPE;
 233
 234     case GDB_SIGNAL_ALRM:
 235       return OBSD_SIGALRM;
 236
 237     case GDB_SIGNAL_TERM:
 238       return OBSD_SIGTERM;
 239
 240     case GDB_SIGNAL_URG:
 241       return OBSD_SIGURG;
 242
 243     case GDB_SIGNAL_STOP:
 244       return OBSD_SIGSTOP;
 245
 246     case GDB_SIGNAL_TSTP:
 247       return OBSD_SIGTSTP;
 248
 249     case GDB_SIGNAL_CONT:
 250       return OBSD_SIGCONT;
 251
 252     case GDB_SIGNAL_CHLD:
 253       return OBSD_SIGCHLD;
 254
 255     case GDB_SIGNAL_TTIN:
 256       return OBSD_SIGTTIN;
 257
 258     case GDB_SIGNAL_TTOU:
 259       return OBSD_SIGTTOU;
 260
 261     case GDB_SIGNAL_IO:
 262       return OBSD_SIGIO;
 263
 264     case GDB_SIGNAL_XCPU:
 265       return OBSD_SIGXCPU;
 266
 267     case GDB_SIGNAL_XFSZ:
 268       return OBSD_SIGXFSZ;
 269
 270     case GDB_SIGNAL_VTALRM:
 271       return OBSD_SIGVTALRM;
 272
 273     case GDB_SIGNAL_PROF:
 274       return OBSD_SIGPROF;
 275
 276     case GDB_SIGNAL_WINCH:
 277       return OBSD_SIGWINCH;
 278
 279     case GDB_SIGNAL_USR1:
 280       return OBSD_SIGUSR1;
 281
 282     case GDB_SIGNAL_USR2:
 283       return OBSD_SIGUSR2;
 284
 285     case GDB_SIGNAL_INFO:
 286       return OBSD_SIGINFO;
 287     }
 288
 289   return -1;
 290 }
 291
 292 static int
 293 obsd_auxv_parse (struct gdbarch *gdbarch, gdb_byte **readptr,
 294                  gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
 295 {
 296   struct type *int_type = builtin_type (gdbarch)->builtin_int;
 297   struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
 298   const int sizeof_auxv_type = TYPE_LENGTH (int_type);
 299   const int sizeof_auxv_val = TYPE_LENGTH (ptr_type);
 300   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 301   gdb_byte *ptr = *readptr;
 302
 303   if (endptr == ptr)
 304     return 0;
 305
 306   if (endptr - ptr < 2 * sizeof_auxv_val)
 307     return -1;
 308
 309   *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order);
 310   ptr += sizeof_auxv_val;       /* Alignment.  */
 311   *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order);
 312   ptr += sizeof_auxv_val;
 313
 314   *readptr = ptr;
 315   return 1;
 316 }
 317
 318 void
 319 obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 320 {
 321   set_gdbarch_gdb_signal_from_target (gdbarch,
 322                                       obsd_gdb_signal_from_target);
 323   set_gdbarch_gdb_signal_to_target (gdbarch,
 324                                     obsd_gdb_signal_to_target);
 325
 326   /* Unlike Linux, OpenBSD actually follows the ELF standard.  */
 327   set_gdbarch_auxv_parse (gdbarch, obsd_auxv_parse);
 328 }