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 <sys/sysctl.h>
  74 #include <dlfcn.h>
  75 #ifdef LISP_FEATURE_X86
  76 #include <machine/cpu.h>
  77 #endif
  78
  79 static void openbsd_init();
  80 #endif
  81
  82 void
  83 os_init(char *argv[], char *envp[])
  84 {
  85     os_vm_page_size = getpagesize();
  86
  87 #ifdef __NetBSD__
  88     netbsd_init();
  89 #elif defined(__FreeBSD__)
  90     freebsd_init();
  91 #elif defined(__OpenBSD__)
  92     openbsd_init();
  93 #endif
  94 }
  95
  96 sigset_t *
  97 os_context_sigmask_addr(os_context_t *context)
  98 {
  99     /* (Unlike most of the other context fields that we access, the
 100      * signal mask field is a field of the basic, outermost context
 101      * struct itself both in FreeBSD 4.0 and in OpenBSD 2.6.) */
 102 #if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(LISP_FEATURE_DARWIN)
 103     return &context->uc_sigmask;
 104 #elif defined (__OpenBSD__)
 105     return &context->sc_mask;
 106 #else
 107 #error unsupported BSD variant
 108 #endif
 109 }
 110
 111 os_vm_address_t
 112 os_validate(os_vm_address_t addr, os_vm_size_t len)
 113 {
 114     int flags = MAP_PRIVATE | MAP_ANON;
 115
 116     if (addr)
 117         flags |= MAP_FIXED;
 118
 119     addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
 120
 121     if (addr == MAP_FAILED) {
 122         perror("mmap");
 123         return NULL;
 124     }
 125
 126     return addr;
 127 }
 128
 129 void
 130 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
 131 {
 132     if (munmap(addr, len) == -1)
 133         perror("munmap");
 134 }
 135
 136 os_vm_address_t
 137 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
 138 {
 139     addr = mmap(addr, len,
 140                 OS_VM_PROT_ALL,
 141                 MAP_PRIVATE | MAP_FILE | MAP_FIXED,
 142                 fd, (off_t) offset);
 143
 144     if (addr == MAP_FAILED) {
 145         perror("mmap");
 146         lose("unexpected mmap(..) failure\n");
 147     }
 148
 149     return addr;
 150 }
 151
 152 void
 153 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
 154 {
 155     if (mprotect(address, length, prot) == -1) {
 156         perror("mprotect");
 157     }
 158 }
 159 \f
 160 static boolean
 161 in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
 162 {
 163     char* beg = (char*) sbeg;
 164     char* end = (char*) sbeg + slen;
 165     char* adr = (char*) a;
 166     return (adr >= beg && adr < end);
 167 }
 168
 169 boolean
 170 is_valid_lisp_addr(os_vm_address_t addr)
 171 {
 172     struct thread *th;
 173
 174     if (in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 175         in_range_p(addr, STATIC_SPACE_START, STATIC_SPACE_SIZE) ||
 176         in_range_p(addr, DYNAMIC_SPACE_START, dynamic_space_size))
 177         return 1;
 178     for_each_thread(th) {
 179         if (((os_vm_address_t)th->control_stack_start <= addr) &&
 180             (addr < (os_vm_address_t)th->control_stack_end))
 181             return 1;
 182         if (in_range_p(addr, (lispobj) th->binding_stack_start,
 183                        BINDING_STACK_SIZE))
 184             return 1;
 185     }
 186     return 0;
 187 }
 188 \f
 189 /*
 190  * any OS-dependent special low-level handling for signals
 191  */
 192
 193 #if defined LISP_FEATURE_GENCGC
 194
 195 /*
 196  * The GENCGC needs to be hooked into whatever signal is raised for
 197  * page fault on this OS.
 198  */
 199
 200 void
 201 memory_fault_handler(int signal, siginfo_t *siginfo, os_context_t *context)
 202 {
 203     void *fault_addr = arch_get_bad_addr(signal, siginfo, context);
 204
 205 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
 206     FSHOW_SIGNAL((stderr, "/ TLS: restoring fs: %p in memory_fault_handler\n",
 207                   *CONTEXT_ADDR_FROM_STEM(fs)));
 208     os_restore_tls_segment_register(context);
 209 #endif
 210
 211     FSHOW((stderr, "Memory fault at: %p, PC: %p\n", fault_addr, *os_context_pc_addr(context)));
 212
 213     if (!gencgc_handle_wp_violation(fault_addr))
 214         if(!handle_guard_page_triggered(context,fault_addr))
 215             lisp_memory_fault_error(context, fault_addr);
 216 }
 217
 218 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 219 void
 220 mach_error_memory_fault_handler(int signal, siginfo_t *siginfo,
 221                                 os_context_t *context) {
 222     lose("Unhandled memory fault. Exiting.");
 223 }
 224 #endif
 225
 226 void
 227 os_install_interrupt_handlers(void)
 228 {
 229     SHOW("os_install_interrupt_handlers()/bsd-os/defined(GENCGC)");
 230 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 231     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 232                                                  mach_error_memory_fault_handler);
 233 #else
 234     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 235 #ifdef LISP_FEATURE_FREEBSD
 236                                                  (__siginfohandler_t *)
 237 #endif
 238                                                  memory_fault_handler);
 239 #endif
 240
 241 #ifdef LISP_FEATURE_SB_THREAD
 242     undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
 243                                                  sig_stop_for_gc_handler);
 244 #endif
 245     SHOW("leaving os_install_interrupt_handlers()");
 246 }
 247
 248 #else /* Currently PPC/Darwin/Cheney only */
 249
 250 static void
 251 sigsegv_handler(int signal, siginfo_t *info, os_context_t *context)
 252 {
 253 #if 0
 254     unsigned int pc =  (unsigned int *)(*os_context_pc_addr(context));
 255 #endif
 256     os_vm_address_t addr;
 257
 258     addr = arch_get_bad_addr(signal, info, context);
 259     if (!cheneygc_handle_wp_violation(context, addr))
 260         if (!handle_guard_page_triggered(context, addr))
 261             interrupt_handle_now(signal, info, context);
 262 }
 263
 264 void
 265 os_install_interrupt_handlers(void)
 266 {
 267     SHOW("os_install_interrupt_handlers()/bsd-os/!defined(GENCGC)");
 268     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 269                                                  sigsegv_handler);
 270 }
 271
 272 #endif /* defined GENCGC */
 273
 274 #ifdef __NetBSD__
 275 static void netbsd_init()
 276 {
 277     struct rlimit rl;
 278     int mib[2], osrev;
 279     size_t len;
 280
 281     /* Are we running on a sufficiently functional kernel? */
 282     mib[0] = CTL_KERN;
 283     mib[1] = KERN_OSREV;
 284
 285     len = sizeof(osrev);
 286     sysctl(mib, 2, &osrev, &len, NULL, 0);
 287
 288     /* If we're older than 2.0... */
 289     if (osrev < 200000000) {
 290         fprintf(stderr, "osrev = %d (needed at least 200000000).\n", osrev);
 291         lose("NetBSD kernel too old to run sbcl.\n");
 292     }
 293
 294     /* NetBSD counts mmap()ed space against the process's data size limit,
 295      * so yank it up. This might be a nasty thing to do? */
 296     getrlimit (RLIMIT_DATA, &rl);
 297     /* Amazingly for such a new port, the provenance and meaning of
 298        this number are unknown.  It might just mean REALLY_BIG_LIMIT,
 299        or possibly it should be calculated from dynamic space size.
 300        -- CSR, 2004-04-08 */
 301     rl.rlim_cur = 1073741824;
 302     if (setrlimit (RLIMIT_DATA, &rl) < 0) {
 303         fprintf (stderr,
 304                  "RUNTIME WARNING: unable to raise process data size limit:\n\
 305   %s.\n\
 306 The system may fail to start.\n",
 307                  strerror(errno));
 308     }
 309 }
 310
 311 /* Various routines in NetBSD's C library are compatibility wrappers
 312    for old versions. Programs must be processed by the C toolchain in
 313    order to get up-to-date definitions of such routines. */
 314 /* The stat-family, opendir, and readdir are used only in sb-posix, as
 315    of 2007-01-16. -- RMK */
 316 int
 317 _stat(const char *path, struct stat *sb)
 318 {
 319     return stat(path, sb);
 320 }
 321 int
 322 _lstat(const char *path, struct stat *sb)
 323 {
 324     return lstat(path, sb);
 325 }
 326 int
 327 _fstat(int fd, struct stat *sb)
 328 {
 329     return fstat(fd, sb);
 330 }
 331
 332 DIR *
 333 _opendir(const char *filename)
 334 {
 335     return opendir(filename);
 336 }
 337 struct dirent *
 338 _readdir(DIR *dirp)
 339 {
 340     return readdir(dirp);
 341 }
 342
 343 /* Used in sb-bsd-sockets. */
 344 int
 345 _socket(int domain, int type, int protocol)
 346 {
 347     return socket(domain, type, protocol);
 348 }
 349 #endif /* __NetBSD__ */
 350
 351 #ifdef __FreeBSD__
 352 extern int getosreldate(void);
 353
 354 int sig_memory_fault;
 355
 356 static void freebsd_init()
 357 {
 358     /* Memory fault signal on FreeBSD was changed from SIGBUS to
 359      * SIGSEGV. */
 360     if (getosreldate() < 700004)
 361         sig_memory_fault = SIGBUS;
 362     else
 363         sig_memory_fault = SIGSEGV;
 364
 365     /* Quote from sbcl-devel (NIIMI Satoshi): "Some OSes, like FreeBSD
 366      * 4.x with GENERIC kernel, does not enable SSE support even on
 367      * SSE capable CPUs". Detect this situation and skip the
 368      * fast_bzero sse/base selection logic that's normally done in
 369      * x86-assem.S.
 370      */
 371 #ifdef LISP_FEATURE_X86
 372     {
 373         size_t len;
 374         int instruction_sse;
 375
 376         len = sizeof(instruction_sse);
 377         if (sysctlbyname("hw.instruction_sse", &instruction_sse, &len,
 378                          NULL, 0) == 0 && instruction_sse != 0) {
 379             /* Use the SSE detector */
 380             fast_bzero_pointer = fast_bzero_detect;
 381         }
 382     }
 383 #endif /* LISP_FEATURE_X86 */
 384 }
 385
 386 #if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX) \
 387     && !defined(LISP_FEATURE_SB_LUTEX)
 388 int
 389 futex_wait(int *lock_word, long oldval, long sec, unsigned long usec)
 390 {
 391     struct timespec timeout;
 392     int ret;
 393
 394     if (sec < 0)
 395         ret = umtx_wait((void *)lock_word, oldval, NULL);
 396     else {
 397         timeout.tv_sec = sec;
 398         timeout.tv_nsec = usec * 1000;
 399         ret = umtx_wait((void *)lock_word, oldval, &timeout);
 400     }
 401
 402     switch (ret) {
 403     case 0:
 404         return 0;
 405     case ETIMEDOUT:
 406         return 1;
 407     case EINTR:
 408         return 2;
 409     default:
 410         /* EWOULDBLOCK and others, need to check the lock */
 411         return -1;
 412     }
 413 }
 414
 415 int
 416 futex_wake(int *lock_word, int n)
 417 {
 418     return umtx_wake((void *)lock_word, n);
 419 }
 420 #endif
 421 #endif /* __FreeBSD__ */
 422
 423 #ifdef LISP_FEATURE_DARWIN
 424 /* defined in ppc-darwin-os.c instead */
 425 #elif defined(LISP_FEATURE_FREEBSD)
 426 #ifndef KERN_PROC_PATHNAME
 427 #define KERN_PROC_PATHNAME 12
 428 #endif
 429
 430 char *
 431 os_get_runtime_executable_path()
 432 {
 433     char path[PATH_MAX + 1];
 434
 435     if (getosreldate() >= 600024) {
 436         /* KERN_PROC_PATHNAME is available */
 437         size_t len = PATH_MAX + 1;
 438         int mib[4];
 439
 440         mib[0] = CTL_KERN;
 441         mib[1] = KERN_PROC;
 442         mib[2] = KERN_PROC_PATHNAME;
 443         mib[3] = -1;
 444         if (sysctl(mib, 4, &path, &len, NULL, 0) != 0)
 445             return NULL;
 446     } else {
 447         int size;
 448         size = readlink("/proc/curproc/file", path, sizeof(path) - 1);
 449         if (size < 0)
 450             return NULL;
 451         path[size] = '\0';
 452     }
 453     if (strcmp(path, "unknown") == 0)
 454         return NULL;
 455     return copied_string(path);
 456 }
 457 #elif defined(LISP_FEATURE_NETBSD) || defined(LISP_FEATURE_OPENBSD)
 458 char *
 459 os_get_runtime_executable_path()
 460 {
 461     struct stat sb;
 462     char *path = strdup("/proc/curproc/file");
 463     if (path && ((stat(path, &sb)) == 0))
 464         return path;
 465     else {
 466         fprintf(stderr, "Couldn't stat /proc/curproc/file; is /proc mounted?\n");
 467         return NULL;
 468     }
 469 }
 470 #else /* Not DARWIN or FREEBSD or NETBSD or OPENBSD */
 471 char *
 472 os_get_runtime_executable_path()
 473 {
 474     return NULL;
 475 }
 476 #endif
 477
 478 #ifdef __OpenBSD__
 479
 480 int openbsd_use_fxsave = 0;
 481
 482 void
 483 openbsd_init()
 484 {
 485 #ifdef LISP_FEATURE_X86
 486     int mib[2];
 487     size_t size;
 488 #endif
 489     /*
 490      * Show a warning if it looks like the memory available after
 491      * allocating the spaces won't be at least this much.
 492      */
 493 #ifdef LISP_FEATURE_X86_64
 494     const int wantfree = 64 * 1024 * 1024;
 495 #else
 496     const int wantfree = 32 * 1024 * 1024;
 497 #endif
 498     struct rlimit rl;
 499
 500 #ifdef LISP_FEATURE_X86
 501     /* Save the machdep.osfxsr sysctl for use by os_restore_fp_control() */
 502     mib[0] = CTL_MACHDEP;
 503     mib[1] = CPU_OSFXSR;
 504     size = sizeof (openbsd_use_fxsave);
 505     sysctl(mib, 2, &openbsd_use_fxsave, &size, NULL, 0);
 506 #endif
 507
 508     /* OpenBSD, like NetBSD, counts mmap()ed space against the
 509      * process's data size limit. If the soft limit is lower than the
 510      * hard limit then try to yank it up, this lets users in the
 511      * "staff" or "daemon" login classes run sbcl with larger dynamic
 512      * space sizes.
 513      */
 514     getrlimit (RLIMIT_DATA, &rl);
 515     if (rl.rlim_cur < rl.rlim_max) {
 516         rl.rlim_cur = rl.rlim_max;
 517         if (setrlimit (RLIMIT_DATA, &rl) < 0) {
 518             fprintf (stderr,
 519                      "RUNTIME WARNING: unable to raise process data size limit:\n\
 520   %s.\n\
 521 The system may fail to start.\n",
 522                      strerror(errno));
 523         }
 524     }
 525
 526     /*
 527      * Display a (hopefully) helpful warning if it looks like we won't
 528      * be able to allocate enough memory.
 529      */
 530     getrlimit (RLIMIT_DATA, &rl);
 531     if (dynamic_space_size + READ_ONLY_SPACE_SIZE + STATIC_SPACE_SIZE +
 532         LINKAGE_TABLE_SPACE_SIZE + wantfree > rl.rlim_cur)
 533         fprintf (stderr,
 534                  "RUNTIME WARNING: data size resource limit may be too low,\n"
 535                  "  try decreasing the dynamic space size with --dynamic-space-size\n"
 536                  "  or raising the datasize or datasize-max limits in /etc/login.conf\n");
 537 }
 538
 539 /* OpenBSD's dlsym() relies on the gcc bulitin
 540  * __builtin_return_address(0) returning an address in the
 541  * executable's text segment, but when called from lisp it will return
 542  * an address in the dynamic space.  Work around this by calling this
 543  * wrapper function instead. Note that tail-call optimization will
 544  * defeat this, disable it by saving the dlsym() return value in a
 545  * volatile variable.
 546 */
 547 void *
 548 os_dlsym(void *handle, const char *symbol)
 549 {
 550     void * volatile ret = dlsym(handle, symbol);
 551     return ret;
 552 }
 553
 554 #endif