src/vm/signal.c

   1 /* src/vm/signal.c - machine independent signal functions
   2
   3    Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, Institut f. Computersprachen - TU Wien
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    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, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25    $Id: signal.c 8306 2007-08-15 14:47:11Z twisti $
  26
  27 */
  28
  29
  30 #include "config.h"
  31
  32 #include <assert.h>
  33 #include <errno.h>
  34 #include <signal.h>
  35 #include <stdint.h>
  36 #include <stdlib.h>
  37
  38 #if defined(__DARWIN__)
  39 /* If we compile with -ansi on darwin, <sys/types.h> is not
  40  included. So let's do it here. */
  41 # include <sys/types.h>
  42 #endif
  43
  44 #include "arch.h"
  45
  46 #include "mm/memory.h"
  47
  48 #if defined(ENABLE_THREADS)
  49 # include "threads/threads-common.h"
  50 #else
  51 # include "threads/none/threads.h"
  52 #endif
  53
  54 #include "toolbox/logging.h"
  55
  56 #include "vm/exceptions.h"
  57 #include "vm/signallocal.h"
  58 #include "vm/vm.h"
  59
  60 #include "vm/jit/codegen-common.h"
  61 #include "vm/jit/disass.h"
  62 #include "vm/jit/patcher-common.h"
  63
  64 #include "vmcore/options.h"
  65
  66 #if defined(ENABLE_STATISTICS)
  67 # include "vmcore/statistics.h"
  68 #endif
  69
  70
  71 /* function prototypes ********************************************************/
  72
  73 void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p);
  74
  75
  76 /* signal_init *****************************************************************
  77
  78    Initializes the signal subsystem and installs the signal handler.
  79
  80 *******************************************************************************/
  81
  82 bool signal_init(void)
  83 {
  84 #if !defined(__CYGWIN__)
  85         sigset_t mask;
  86
  87 #if defined(__LINUX__) && defined(ENABLE_THREADS)
  88         /* XXX Remove for exact-GC. */
  89         if (threads_pthreads_implementation_nptl) {
  90 #endif
  91
  92         /* Block the following signals (SIGINT for <ctrl>-c, SIGQUIT for
  93            <ctrl>-\).  We enable them later in signal_thread, but only for
  94            this thread. */
  95
  96         if (sigemptyset(&mask) != 0)
  97                 vm_abort("signal_init: sigemptyset failed: %s", strerror(errno));
  98
  99         if (sigaddset(&mask, SIGINT) != 0)
 100                 vm_abort("signal_init: sigaddset failed: %s", strerror(errno));
 101
 102 #if !defined(__FREEBSD__)
 103         if (sigaddset(&mask, SIGQUIT) != 0)
 104                 vm_abort("signal_init: sigaddset failed: %s", strerror(errno));
 105 #endif
 106
 107         if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0)
 108                 vm_abort("signal_init: sigprocmask failed: %s", strerror(errno));
 109
 110 #if defined(__LINUX__) && defined(ENABLE_THREADS)
 111         /* XXX Remove for exact-GC. */
 112         }
 113 #endif
 114
 115 #if defined(ENABLE_GC_BOEHM)
 116         /* Allocate something so the garbage collector's signal handlers
 117            are installed. */
 118
 119         (void) GCNEW(int);
 120 #endif
 121
 122         /* Install signal handlers for signals we want to catch in all
 123            threads. */
 124
 125 #if defined(ENABLE_JIT)
 126 # if defined(ENABLE_INTRP)
 127         if (!opt_intrp) {
 128 # endif
 129                 /* SIGSEGV handler */
 130
 131                 signal_register_signal(SIGSEGV, (functionptr) md_signal_handler_sigsegv,
 132                                                            SA_NODEFER | SA_SIGINFO);
 133
 134 #  if defined(SIGBUS)
 135                 signal_register_signal(SIGBUS, (functionptr) md_signal_handler_sigsegv,
 136                                                            SA_NODEFER | SA_SIGINFO);
 137 #  endif
 138
 139 #  if SUPPORT_HARDWARE_DIVIDE_BY_ZERO
 140                 /* SIGFPE handler */
 141
 142                 signal_register_signal(SIGFPE, (functionptr) md_signal_handler_sigfpe,
 143                                                            SA_NODEFER | SA_SIGINFO);
 144 #  endif
 145
 146 #  if defined(__ARM__) || defined(__S390__)
 147                 /* XXX use better defines for that (in arch.h) */
 148                 /* SIGILL handler */
 149
 150                 signal_register_signal(SIGILL, (functionptr) md_signal_handler_sigill,
 151                                                            SA_NODEFER | SA_SIGINFO);
 152 #  endif
 153
 154 #  if defined(__POWERPC__)
 155                 /* XXX use better defines for that (in arch.h) */
 156                 /* SIGTRAP handler */
 157
 158                 signal_register_signal(SIGTRAP, (functionptr) md_signal_handler_sigtrap,
 159                                                            SA_NODEFER | SA_SIGINFO);
 160 #  endif
 161 # if defined(ENABLE_INTRP)
 162         }
 163 # endif
 164 #endif /* !defined(ENABLE_INTRP) */
 165
 166 #if defined(ENABLE_THREADS)
 167         /* SIGHUP handler for threads_thread_interrupt */
 168
 169         signal_register_signal(SIGHUP, (functionptr) signal_handler_sighup, 0);
 170 #endif
 171
 172 #if defined(ENABLE_THREADS) && defined(ENABLE_PROFILING)
 173         /* SIGUSR2 handler for profiling sampling */
 174
 175         signal_register_signal(SIGUSR2, (functionptr) md_signal_handler_sigusr2,
 176                                                    SA_SIGINFO);
 177 #endif
 178
 179 #endif /* !defined(__CYGWIN__) */
 180
 181         return true;
 182 }
 183
 184
 185 /* signal_register_signal ******************************************************
 186
 187    Register the specified handler with the specified signal.
 188
 189 *******************************************************************************/
 190
 191 void signal_register_signal(int signum, functionptr handler, int flags)
 192 {
 193         struct sigaction act;
 194         void (*function)(int, siginfo_t *, void *);
 195
 196         function = (void (*)(int, siginfo_t *, void *)) handler;
 197
 198         if (sigemptyset(&act.sa_mask) != 0)
 199                 vm_abort("signal_register_signal: sigemptyset failed: %s",
 200                                  strerror(errno));
 201
 202         act.sa_sigaction = function;
 203         act.sa_flags     = flags;
 204
 205         if (sigaction(signum, &act, NULL) != 0)
 206                 vm_abort("signal_register_signal: sigaction failed: %s",
 207                                  strerror(errno));
 208 }
 209
 210
 211 /* signal_handle ***************************************************************
 212
 213    Handles the signal caught by a signal handler and calls the correct
 214    function.
 215
 216 *******************************************************************************/
 217
 218 void *signal_handle(void *xpc, int type, intptr_t val)
 219 {
 220         void          *p;
 221         int32_t        index;
 222         java_object_t *o;
 223
 224         switch (type) {
 225         case EXCEPTION_HARDWARE_NULLPOINTER:
 226                 p = exceptions_new_nullpointerexception();
 227                 break;
 228
 229         case EXCEPTION_HARDWARE_ARITHMETIC:
 230                 p = exceptions_new_arithmeticexception();
 231                 break;
 232
 233         case EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS:
 234                 index = (s4) val;
 235                 p = exceptions_new_arrayindexoutofboundsexception(index);
 236                 break;
 237
 238         case EXCEPTION_HARDWARE_CLASSCAST:
 239                 o = (java_object_t *) val;
 240                 p = exceptions_new_classcastexception(o);
 241                 break;
 242
 243         case EXCEPTION_HARDWARE_EXCEPTION:
 244                 p = exceptions_fillinstacktrace();
 245                 break;
 246
 247         case EXCEPTION_HARDWARE_PATCHER:
 248 #if defined(ENABLE_REPLACEMENT)
 249                 if (replace_me_wrapper(xpc)) {
 250                         p = NULL;
 251                         break;
 252                 }
 253 #endif
 254                 p = patcher_handler(xpc);
 255                 break;
 256
 257         default:
 258                 /* Let's try to get a backtrace. */
 259
 260                 codegen_get_pv_from_pc(xpc);
 261
 262                 /* If that does not work, print more debug info. */
 263
 264                 log_println("exceptions_new_hardware_exception: unknown exception type %d", type);
 265
 266 #if SIZEOF_VOID_P == 8
 267                 log_println("PC=0x%016lx", xpc);
 268 #else
 269                 log_println("PC=0x%08x", xpc);
 270 #endif
 271
 272 #if defined(ENABLE_DISASSEMBLER)
 273                 log_println("machine instruction at PC:");
 274                 disassinstr(xpc);
 275 #endif
 276
 277                 vm_abort("Exiting...");
 278
 279                 /* keep compiler happy */
 280
 281                 p = NULL;
 282         }
 283
 284         return p;
 285 }
 286
 287
 288 /* signal_thread ************************************************************
 289
 290    This thread sets the signal mask to catch the user input signals
 291    (SIGINT, SIGQUIT).  We use such a thread, so we don't get the
 292    signals on every single thread running.
 293
 294 *******************************************************************************/
 295
 296 static void signal_thread(void)
 297 {
 298         threadobject *t;
 299         sigset_t      mask;
 300         int           sig;
 301
 302         t = THREADOBJECT;
 303
 304         if (sigemptyset(&mask) != 0)
 305                 vm_abort("signal_thread: sigemptyset failed: %s", strerror(errno));
 306
 307         if (sigaddset(&mask, SIGINT) != 0)
 308                 vm_abort("signal_thread: sigaddset failed: %s", strerror(errno));
 309
 310 #if !defined(__FREEBSD__)
 311         if (sigaddset(&mask, SIGQUIT) != 0)
 312                 vm_abort("signal_thread: sigaddset failed: %s", strerror(errno));
 313 #endif
 314
 315         while (true) {
 316                 /* just wait for a signal */
 317
 318                 /* XXX We don't check for an error here, although the man-page
 319                    states sigwait does not return an error (which is wrong!),
 320                    but it seems to make problems with Boehm-GC.  We should
 321                    revisit this code with our new exact-GC. */
 322
 323 #if defined(ENABLE_THREADS)
 324                 threads_thread_state_waiting(t);
 325 #endif
 326
 327 /*              if (sigwait(&mask, &sig) != 0) */
 328 /*                      vm_abort("signal_thread: sigwait failed: %s", strerror(errno)); */
 329                 (void) sigwait(&mask, &sig);
 330
 331 #if defined(ENABLE_THREADS)
 332                 threads_thread_state_runnable(t);
 333 #endif
 334
 335                 switch (sig) {
 336                 case SIGINT:
 337                         /* exit the vm properly */
 338
 339                         vm_exit(0);
 340                         break;
 341
 342                 case SIGQUIT:
 343                         /* print a thread dump */
 344 #if defined(ENABLE_THREADS)
 345                         threads_dump();
 346 #endif
 347
 348 #if defined(ENABLE_STATISTICS)
 349                         if (opt_stat)
 350                                 statistics_print_memory_usage();
 351 #endif
 352                         break;
 353                 }
 354         }
 355
 356         /* this should not happen */
 357
 358         vm_abort("signal_thread: this thread should not exit!");
 359 }
 360
 361
 362 /* signal_start_thread *********************************************************
 363
 364    Starts the signal handler thread.
 365
 366 *******************************************************************************/
 367
 368 bool signal_start_thread(void)
 369 {
 370 #if defined(ENABLE_THREADS)
 371         utf *name;
 372
 373         name = utf_new_char("Signal Handler");
 374
 375         if (!threads_thread_start_internal(name, signal_thread))
 376                 return false;
 377
 378         /* everything's ok */
 379
 380         return true;
 381 #else
 382 #warning FIX ME!
 383 #endif
 384 }
 385
 386
 387 /* signal_handler_sighup *******************************************************
 388
 389    This handler is required by threads_thread_interrupt and does
 390    nothing.
 391
 392 *******************************************************************************/
 393
 394 #if defined(ENABLE_THREADS)
 395 void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p)
 396 {
 397         /* do nothing */
 398 }
 399 #endif
 400
 401
 402 /*
 403  * These are local overrides for various environment variables in Emacs.
 404  * Please do not remove this and leave it at the end of the file, where
 405  * Emacs will automagically detect them.
 406  * ---------------------------------------------------------------------
 407  * Local variables:
 408  * mode: c
 409  * indent-tabs-mode: t
 410  * c-basic-offset: 4
 411  * tab-width: 4
 412  * End:
 413  */