src/runtime/bsd-os.c

   1 /*
   2  * OS-dependent routines for BSD-ish systems
   3  *
   4  * This file (along with os.h) exports an OS-independent interface to
   5  * the operating system VM facilities. This interface looks a lot like
   6  * the Mach interface (but simpler in some places). For some operating
   7  * systems, a subset of these functions will have to be emulated.
   8  */
   9
  10 /*
  11  * This software is part of the SBCL system. See the README file for
  12  * more information.
  13  *
  14  * This software is derived from the CMU CL system, which was
  15  * written at Carnegie Mellon University and released into the
  16  * public domain. The software is in the public domain and is
  17  * provided with absolutely no warranty. See the COPYING and CREDITS
  18  * files for more information.
  19  */
  20
  21 #include <stdio.h>
  22 #include <sys/param.h>
  23 #include <sys/file.h>
  24 #include <unistd.h>
  25 #include <assert.h>
  26 #include <errno.h>
  27 #include "sbcl.h"
  28 #include "./signal.h"
  29 #include "os.h"
  30 #include "arch.h"
  31 #include "globals.h"
  32 #include "interrupt.h"
  33 #include "interr.h"
  34 #include "lispregs.h"
  35 #include "thread.h"
  36 #include "runtime.h"
  37 #include "genesis/static-symbols.h"
  38 #include "genesis/fdefn.h"
  39
  40 #include <sys/types.h>
  41 #include <signal.h>
  42 /* #include <sys/sysinfo.h> */
  43 #include "validate.h"
  44 #if defined LISP_FEATURE_GENCGC
  45 #include "gencgc-internal.h"
  46 #endif
  47 \f
  48 os_vm_size_t os_vm_page_size;
  49
  50 #ifdef __NetBSD__
  51 #include <sys/resource.h>
  52 #include <sys/sysctl.h>
  53 #include <string.h>
  54 #include <sys/stat.h> /* For the stat-family wrappers. */
  55 #include <dirent.h>   /* For the opendir()/readdir() wrappers */
  56 #include <sys/socket.h> /* For the socket() wrapper */
  57 static void netbsd_init();
  58 #endif /* __NetBSD__ */
  59
  60 #ifdef __FreeBSD__
  61 #include <sys/sysctl.h>
  62 #if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
  63 #include <sys/umtx.h>
  64 #endif
  65
  66 static void freebsd_init();
  67 #endif /* __FreeBSD__ */
  68
  69 #ifdef __OpenBSD__
  70 #include <sys/types.h>
  71 #include <sys/resource.h>
  72 #include <sys/stat.h>
  73 #include <dlfcn.h>
  74
  75 static void openbsd_init();
  76 #endif
  77
  78 void
  79 os_init(char *argv[], char *envp[])
  80 {
  81     os_vm_page_size = getpagesize();
  82
  83 #ifdef __NetBSD__
  84     netbsd_init();
  85 #elif defined(__FreeBSD__)
  86     freebsd_init();
  87 #elif defined(__OpenBSD__)
  88     openbsd_init();
  89 #endif
  90 }
  91
  92 sigset_t *
  93 os_context_sigmask_addr(os_context_t *context)
  94 {
  95     /* (Unlike most of the other context fields that we access, the
  96      * signal mask field is a field of the basic, outermost context
  97      * struct itself both in FreeBSD 4.0 and in OpenBSD 2.6.) */
  98 #if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(LISP_FEATURE_DARWIN)
  99     return &context->uc_sigmask;
 100 #elif defined (__OpenBSD__)
 101     return &context->sc_mask;
 102 #else
 103 #error unsupported BSD variant
 104 #endif
 105 }
 106
 107 os_vm_address_t
 108 os_validate(os_vm_address_t addr, os_vm_size_t len)
 109 {
 110     int flags = MAP_PRIVATE | MAP_ANON;
 111
 112     if (addr)
 113         flags |= MAP_FIXED;
 114
 115     addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
 116
 117     if (addr == MAP_FAILED) {
 118         perror("mmap");
 119         return NULL;
 120     }
 121
 122     return addr;
 123 }
 124
 125 void
 126 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
 127 {
 128     if (munmap(addr, len) == -1)
 129         perror("munmap");
 130 }
 131
 132 os_vm_address_t
 133 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
 134 {
 135     addr = mmap(addr, len,
 136                 OS_VM_PROT_ALL,
 137                 MAP_PRIVATE | MAP_FILE | MAP_FIXED,
 138                 fd, (off_t) offset);
 139
 140     if (addr == MAP_FAILED) {
 141         perror("mmap");
 142         lose("unexpected mmap(..) failure\n");
 143     }
 144
 145     return addr;
 146 }
 147
 148 void
 149 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
 150 {
 151     if (mprotect(address, length, prot) == -1) {
 152         perror("mprotect");
 153     }
 154 }
 155 \f
 156 static boolean
 157 in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
 158 {
 159     char* beg = (char*) sbeg;
 160     char* end = (char*) sbeg + slen;
 161     char* adr = (char*) a;
 162     return (adr >= beg && adr < end);
 163 }
 164
 165 boolean
 166 is_valid_lisp_addr(os_vm_address_t addr)
 167 {
 168     struct thread *th;
 169
 170     if (in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 171         in_range_p(addr, STATIC_SPACE_START, STATIC_SPACE_SIZE) ||
 172         in_range_p(addr, DYNAMIC_SPACE_START, dynamic_space_size))
 173         return 1;
 174     for_each_thread(th) {
 175         if (((os_vm_address_t)th->control_stack_start <= addr) &&
 176             (addr < (os_vm_address_t)th->control_stack_end))
 177             return 1;
 178         if (in_range_p(addr, (lispobj) th->binding_stack_start,
 179                        BINDING_STACK_SIZE))
 180             return 1;
 181     }
 182     return 0;
 183 }
 184 \f
 185 /*
 186  * any OS-dependent special low-level handling for signals
 187  */
 188
 189 #if defined LISP_FEATURE_GENCGC
 190
 191 /*
 192  * The GENCGC needs to be hooked into whatever signal is raised for
 193  * page fault on this OS.
 194  */
 195
 196 void
 197 memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context
 198 #if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
 199 /* FreeBSD/amd64 stores fault address only in undocumented 4th arg. */
 200                      ,void *fault_addr
 201 #endif
 202     )
 203 {
 204     os_context_t *context = arch_os_get_context(&void_context);
 205 #if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
 206     /* KLUDGE: Store fault address into si_addr for compatibilities. */
 207     siginfo->si_addr = fault_addr;
 208 #else
 209     void *fault_addr = arch_get_bad_addr(signal, siginfo, context);
 210 #endif
 211
 212 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
 213     FSHOW_SIGNAL((stderr, "/ TLS: restoring fs: %p in memory_fault_handler\n",
 214                   *CONTEXT_ADDR_FROM_STEM(fs)));
 215     os_restore_tls_segment_register(context);
 216 #endif
 217
 218     FSHOW((stderr, "Memory fault at: %p, PC: %p\n", fault_addr, *os_context_pc_addr(context)));
 219
 220     if (!gencgc_handle_wp_violation(fault_addr))
 221         if(!handle_guard_page_triggered(context,fault_addr)) {
 222 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 223             lisp_memory_fault_error(context, fault_addr);
 224 #else
 225             if (!maybe_gc(context)) {
 226                 interrupt_handle_now(signal, siginfo, context);
 227             }
 228 #endif
 229         }
 230 }
 231
 232 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 233 void
 234 mach_error_memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context) {
 235     lose("Unhandled memory fault. Exiting.");
 236 }
 237 #endif
 238
 239 void
 240 os_install_interrupt_handlers(void)
 241 {
 242     SHOW("os_install_interrupt_handlers()/bsd-os/defined(GENCGC)");
 243 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 244     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 245                                                  mach_error_memory_fault_handler);
 246 #else
 247     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 248 #ifdef LISP_FEATURE_FREEBSD
 249                                                  (__siginfohandler_t *)
 250 #endif
 251                                                  memory_fault_handler);
 252 #endif
 253
 254 #ifdef LISP_FEATURE_SB_THREAD
 255     undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
 256                                                  interrupt_thread_handler);
 257     undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
 258                                                  sig_stop_for_gc_handler);
 259 #ifdef SIG_RESUME_FROM_GC
 260     undoably_install_low_level_interrupt_handler(SIG_RESUME_FROM_GC,
 261                                                  sig_stop_for_gc_handler);
 262 #endif
 263 #endif
 264     SHOW("leaving os_install_interrupt_handlers()");
 265 }
 266
 267 #else /* Currently PPC/Darwin/Cheney only */
 268
 269 static void
 270 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 271 {
 272     os_context_t *context = arch_os_get_context(&void_context);
 273 #if 0
 274     unsigned int pc =  (unsigned int *)(*os_context_pc_addr(context));
 275 #endif
 276     os_vm_address_t addr;
 277
 278     addr = arch_get_bad_addr(signal, info, context);
 279     if (!cheneygc_handle_wp_violation(context, addr))
 280         if (!handle_guard_page_triggered(context, addr))
 281             interrupt_handle_now(signal, info, context);
 282 }
 283
 284 void
 285 os_install_interrupt_handlers(void)
 286 {
 287     SHOW("os_install_interrupt_handlers()/bsd-os/!defined(GENCGC)");
 288     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 289                                                  sigsegv_handler);
 290 }
 291
 292 #endif /* defined GENCGC */
 293
 294 #ifdef __NetBSD__
 295 static void netbsd_init()
 296 {
 297     struct rlimit rl;
 298     int mib[2], osrev;
 299     size_t len;
 300
 301     /* Are we running on a sufficiently functional kernel? */
 302     mib[0] = CTL_KERN;
 303     mib[1] = KERN_OSREV;
 304
 305     len = sizeof(osrev);
 306     sysctl(mib, 2, &osrev, &len, NULL, 0);
 307
 308     /* If we're older than 2.0... */
 309     if (osrev < 200000000) {
 310         fprintf(stderr, "osrev = %d (needed at least 200000000).\n", osrev);
 311         lose("NetBSD kernel too old to run sbcl.\n");
 312     }
 313
 314     /* NetBSD counts mmap()ed space against the process's data size limit,
 315      * so yank it up. This might be a nasty thing to do? */
 316     getrlimit (RLIMIT_DATA, &rl);
 317     /* Amazingly for such a new port, the provenance and meaning of
 318        this number are unknown.  It might just mean REALLY_BIG_LIMIT,
 319        or possibly it should be calculated from dynamic space size.
 320        -- CSR, 2004-04-08 */
 321     rl.rlim_cur = 1073741824;
 322     if (setrlimit (RLIMIT_DATA, &rl) < 0) {
 323         fprintf (stderr,
 324                  "RUNTIME WARNING: unable to raise process data size limit:\n\
 325   %s.\n\
 326 The system may fail to start.\n",
 327                  strerror(errno));
 328     }
 329 }
 330
 331 /* Various routines in NetBSD's C library are compatibility wrappers
 332    for old versions. Programs must be processed by the C toolchain in
 333    order to get up-to-date definitions of such routines. */
 334 /* The stat-family, opendir, and readdir are used only in sb-posix, as
 335    of 2007-01-16. -- RMK */
 336 int
 337 _stat(const char *path, struct stat *sb)
 338 {
 339     return stat(path, sb);
 340 }
 341 int
 342 _lstat(const char *path, struct stat *sb)
 343 {
 344     return lstat(path, sb);
 345 }
 346 int
 347 _fstat(int fd, struct stat *sb)
 348 {
 349     return fstat(fd, sb);
 350 }
 351
 352 DIR *
 353 _opendir(const char *filename)
 354 {
 355     return opendir(filename);
 356 }
 357 struct dirent *
 358 _readdir(DIR *dirp)
 359 {
 360     return readdir(dirp);
 361 }
 362
 363 /* Used in sb-bsd-sockets. */
 364 int
 365 _socket(int domain, int type, int protocol)
 366 {
 367     return socket(domain, type, protocol);
 368 }
 369 #endif /* __NetBSD__ */
 370
 371 #ifdef __FreeBSD__
 372 extern int getosreldate(void);
 373
 374 int sig_memory_fault;
 375
 376 static void freebsd_init()
 377 {
 378     /* Memory fault signal on FreeBSD was changed from SIGBUS to
 379      * SIGSEGV. */
 380     if (getosreldate() < 700004)
 381         sig_memory_fault = SIGBUS;
 382     else
 383         sig_memory_fault = SIGSEGV;
 384
 385     /* Quote from sbcl-devel (NIIMI Satoshi): "Some OSes, like FreeBSD
 386      * 4.x with GENERIC kernel, does not enable SSE support even on
 387      * SSE capable CPUs". Detect this situation and skip the
 388      * fast_bzero sse/base selection logic that's normally done in
 389      * x86-assem.S.
 390      */
 391 #ifdef LISP_FEATURE_X86
 392     {
 393         size_t len;
 394         int instruction_sse;
 395
 396         len = sizeof(instruction_sse);
 397         if (sysctlbyname("hw.instruction_sse", &instruction_sse, &len,
 398                          NULL, 0) == 0 && instruction_sse != 0) {
 399             /* Use the SSE detector */
 400             fast_bzero_pointer = fast_bzero_detect;
 401         }
 402     }
 403 #endif /* LISP_FEATURE_X86 */
 404 }
 405
 406 #if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
 407 int
 408 futex_wait(int *lock_word, long oldval, long sec, unsigned long usec)
 409 {
 410     struct timespec timeout;
 411     int ret;
 412
 413 again:
 414     if (sec < 0)
 415         ret = umtx_wait((void *)lock_word, oldval, NULL);
 416     else {
 417         timeout.tv_sec = sec;
 418         timeout.tv_nsec = usec * 1000;
 419         ret = umtx_wait((void *)lock_word, oldval, &timeout);
 420     }
 421
 422     switch (ret) {
 423     case 0:
 424         return 0;
 425     case ETIMEDOUT:
 426         return 1;
 427     case EINTR:
 428         /* spurious wakeup from interrupt */
 429         goto again;
 430     default:
 431         /* EWOULDBLOCK and others, need to check the lock */
 432         return -1;
 433     }
 434 }
 435
 436 int
 437 futex_wake(int *lock_word, int n)
 438 {
 439     return umtx_wake((void *)lock_word, n);
 440 }
 441 #endif
 442 #endif /* __FreeBSD__ */
 443
 444 #ifdef LISP_FEATURE_DARWIN
 445 /* defined in ppc-darwin-os.c instead */
 446 #elif defined(LISP_FEATURE_FREEBSD)
 447 #ifndef KERN_PROC_PATHNAME
 448 #define KERN_PROC_PATHNAME 12
 449 #endif
 450
 451 char *
 452 os_get_runtime_executable_path()
 453 {
 454     char path[PATH_MAX + 1];
 455
 456     if (getosreldate() >= 600024) {
 457         /* KERN_PROC_PATHNAME is available */
 458         size_t len = PATH_MAX + 1;
 459         int mib[4];
 460
 461         mib[0] = CTL_KERN;
 462         mib[1] = KERN_PROC;
 463         mib[2] = KERN_PROC_PATHNAME;
 464         mib[3] = -1;
 465         if (sysctl(mib, 4, &path, &len, NULL, 0) != 0)
 466             return NULL;
 467     } else {
 468         int size;
 469         size = readlink("/proc/curproc/file", path, sizeof(path) - 1);
 470         if (size < 0)
 471             return NULL;
 472         path[size] = '\0';
 473     }
 474     if (strcmp(path, "unknown") == 0)
 475         return NULL;
 476     return copied_string(path);
 477 }
 478 #elif defined(LISP_FEATURE_NETBSD) || defined(LISP_FEATURE_OPENBSD)
 479 char *
 480 os_get_runtime_executable_path()
 481 {
 482     struct stat sb;
 483     char *path = strdup("/proc/curproc/file");
 484     if (path && ((stat(path, &sb)) == 0))
 485         return path;
 486     else {
 487         fprintf(stderr, "Couldn't stat /proc/curproc/file; is /proc mounted?\n");
 488         return NULL;
 489     }
 490 }
 491 #else /* Not DARWIN or FREEBSD or NETBSD or OPENBSD */
 492 char *
 493 os_get_runtime_executable_path()
 494 {
 495     return NULL;
 496 }
 497 #endif
 498
 499 #ifdef __OpenBSD__
 500 void
 501 openbsd_init()
 502 {
 503     struct rlimit rl;
 504
 505     /* OpenBSD, like NetBSD, counts mmap()ed space against the
 506      * process's data size limit. If the soft limit is lower than the
 507      * hard limit then try to yank it up, this lets users in the
 508      * "staff" login class run sbcl with a default /etc/login.conf
 509      */
 510     getrlimit (RLIMIT_DATA, &rl);
 511     if (rl.rlim_cur < rl.rlim_max) {
 512         rl.rlim_cur = rl.rlim_max;
 513         if (setrlimit (RLIMIT_DATA, &rl) < 0) {
 514             fprintf (stderr,
 515                      "RUNTIME WARNING: unable to raise process data size limit:\n\
 516   %s.\n\
 517 The system may fail to start.\n",
 518                      strerror(errno));
 519         }
 520     }
 521
 522     /* Display a (hopefully) helpful warning if it looks like we won't
 523      * be able to allocate enough memory. In testing I found that on
 524      * my system at least, a minimum of 25M on top of the three space
 525      * sizes was needed to start SBCL. Show a warning below 32M so as
 526      * to leave a little breathing room.
 527      */
 528     getrlimit (RLIMIT_DATA, &rl);
 529     if (dynamic_space_size + READ_ONLY_SPACE_SIZE + STATIC_SPACE_SIZE +
 530         LINKAGE_TABLE_SPACE_SIZE + (32*1024*1024) > rl.rlim_cur)
 531         fprintf (stderr,
 532                  "RUNTIME WARNING: data size resource limit may be too low,\n"
 533                  "  try decreasing the dynamic space size with --dynamic-space-size\n");
 534 }
 535
 536 /* OpenBSD's dlsym() relies on the gcc bulitin
 537  * __builtin_return_address(0) returning an address in the
 538  * executable's text segment, but when called from lisp it will return
 539  * an address in the dynamic space.  Work around this by calling this
 540  * wrapper function instead. Note that tail-call optimization will
 541  * defeat this, disable it by saving the dlsym() return value in a
 542  * volatile variable.
 543 */
 544 void *
 545 os_dlsym(void *handle, const char *symbol)
 546 {
 547     void * volatile ret = dlsym(handle, symbol);
 548     return ret;
 549 }
 550
 551 #endif