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 void
  70 os_init(char *argv[], char *envp[])
  71 {
  72     os_vm_page_size = getpagesize();
  73
  74 #ifdef __NetBSD__
  75     netbsd_init();
  76 #elif defined(__FreeBSD__)
  77     freebsd_init();
  78 #endif
  79 }
  80
  81 sigset_t *
  82 os_context_sigmask_addr(os_context_t *context)
  83 {
  84     /* (Unlike most of the other context fields that we access, the
  85      * signal mask field is a field of the basic, outermost context
  86      * struct itself both in FreeBSD 4.0 and in OpenBSD 2.6.) */
  87 #if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(LISP_FEATURE_DARWIN)
  88     return &context->uc_sigmask;
  89 #elif defined (__OpenBSD__)
  90     return &context->sc_mask;
  91 #else
  92 #error unsupported BSD variant
  93 #endif
  94 }
  95
  96 os_vm_address_t
  97 os_validate(os_vm_address_t addr, os_vm_size_t len)
  98 {
  99     int flags = MAP_PRIVATE | MAP_ANON;
 100
 101     if (addr)
 102         flags |= MAP_FIXED;
 103
 104     addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
 105
 106     if (addr == MAP_FAILED) {
 107         perror("mmap");
 108         return NULL;
 109     }
 110
 111     return addr;
 112 }
 113
 114 void
 115 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
 116 {
 117     if (munmap(addr, len) == -1)
 118         perror("munmap");
 119 }
 120
 121 os_vm_address_t
 122 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
 123 {
 124     addr = mmap(addr, len,
 125                 OS_VM_PROT_ALL,
 126                 MAP_PRIVATE | MAP_FILE | MAP_FIXED,
 127                 fd, (off_t) offset);
 128
 129     if (addr == MAP_FAILED) {
 130         perror("mmap");
 131         lose("unexpected mmap(..) failure\n");
 132     }
 133
 134     return addr;
 135 }
 136
 137 void
 138 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
 139 {
 140     if (mprotect(address, length, prot) == -1) {
 141         perror("mprotect");
 142     }
 143 }
 144 \f
 145 static boolean
 146 in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
 147 {
 148     char* beg = (char*) sbeg;
 149     char* end = (char*) sbeg + slen;
 150     char* adr = (char*) a;
 151     return (adr >= beg && adr < end);
 152 }
 153
 154 boolean
 155 is_valid_lisp_addr(os_vm_address_t addr)
 156 {
 157     struct thread *th;
 158
 159     if (in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 160         in_range_p(addr, STATIC_SPACE_START, STATIC_SPACE_SIZE) ||
 161         in_range_p(addr, DYNAMIC_SPACE_START, dynamic_space_size))
 162         return 1;
 163     for_each_thread(th) {
 164         if (((os_vm_address_t)th->control_stack_start <= addr) &&
 165             (addr < (os_vm_address_t)th->control_stack_end))
 166             return 1;
 167         if (in_range_p(addr, (lispobj) th->binding_stack_start,
 168                        BINDING_STACK_SIZE))
 169             return 1;
 170     }
 171     return 0;
 172 }
 173 \f
 174 /*
 175  * any OS-dependent special low-level handling for signals
 176  */
 177
 178 #if defined LISP_FEATURE_GENCGC
 179
 180 /*
 181  * The GENCGC needs to be hooked into whatever signal is raised for
 182  * page fault on this OS.
 183  */
 184
 185 void
 186 memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context
 187 #if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
 188 /* FreeBSD/amd64 stores fault address only in undocumented 4th arg. */
 189                      ,void *fault_addr
 190 #endif
 191     )
 192 {
 193     os_context_t *context = arch_os_get_context(&void_context);
 194 #if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
 195     /* KLUDGE: Store fault address into si_addr for compatibilities. */
 196     siginfo->si_addr = fault_addr;
 197 #else
 198     void *fault_addr = arch_get_bad_addr(signal, siginfo, context);
 199 #endif
 200
 201 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
 202     FSHOW_SIGNAL((stderr, "/ TLS: restoring fs: %p in memory_fault_handler\n",
 203                   *CONTEXT_ADDR_FROM_STEM(fs)));
 204     os_restore_tls_segment_register(context);
 205 #endif
 206
 207     FSHOW((stderr, "Memory fault at: %p, PC: %p\n", fault_addr, *os_context_pc_addr(context)));
 208
 209     if (!gencgc_handle_wp_violation(fault_addr))
 210         if(!handle_guard_page_triggered(context,fault_addr)) {
 211 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 212             lisp_memory_fault_error(context, fault_addr);
 213 #else
 214             if (!maybe_gc(context)) {
 215                 interrupt_handle_now(signal, siginfo, context);
 216             }
 217 #if defined(LISP_FEATURE_DARWIN)
 218             /* Work around G5 bug; fix courtesy gbyers */
 219             DARWIN_FIX_CONTEXT(context);
 220 #endif
 221 #endif
 222         }
 223 }
 224
 225 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 226 void
 227 mach_error_memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context) {
 228     lose("Unhandled memory fault. Exiting.");
 229 }
 230 #endif
 231
 232 void
 233 os_install_interrupt_handlers(void)
 234 {
 235     SHOW("os_install_interrupt_handlers()/bsd-os/defined(GENCGC)");
 236 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 237     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 238                                                  mach_error_memory_fault_handler);
 239 #else
 240     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 241 #ifdef LISP_FEATURE_FREEBSD
 242                                                  (__siginfohandler_t *)
 243 #endif
 244                                                  memory_fault_handler);
 245 #endif
 246
 247 #ifdef LISP_FEATURE_SB_THREAD
 248     undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
 249                                                  interrupt_thread_handler);
 250     undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
 251                                                  sig_stop_for_gc_handler);
 252 #ifdef SIG_RESUME_FROM_GC
 253     undoably_install_low_level_interrupt_handler(SIG_RESUME_FROM_GC,
 254                                                  sig_stop_for_gc_handler);
 255 #endif
 256 #endif
 257     SHOW("leaving os_install_interrupt_handlers()");
 258 }
 259
 260 #else /* Currently PPC/Darwin/Cheney only */
 261
 262 static void
 263 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 264 {
 265     os_context_t *context = arch_os_get_context(&void_context);
 266 #if 0
 267     unsigned int pc =  (unsigned int *)(*os_context_pc_addr(context));
 268 #endif
 269     os_vm_address_t addr;
 270
 271     addr = arch_get_bad_addr(signal, info, context);
 272     if (!cheneygc_handle_wp_violation(context, addr))
 273         if (!handle_guard_page_triggered(context, addr))
 274             interrupt_handle_now(signal, info, context);
 275     /* Work around G5 bug; fix courtesy gbyers */
 276     DARWIN_FIX_CONTEXT(context);
 277 }
 278
 279 void
 280 os_install_interrupt_handlers(void)
 281 {
 282     SHOW("os_install_interrupt_handlers()/bsd-os/!defined(GENCGC)");
 283     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 284                                                  sigsegv_handler);
 285 }
 286
 287 #endif /* defined GENCGC */
 288
 289 #ifdef __NetBSD__
 290 static void netbsd_init()
 291 {
 292     struct rlimit rl;
 293     int mib[2], osrev;
 294     size_t len;
 295
 296     /* Are we running on a sufficiently functional kernel? */
 297     mib[0] = CTL_KERN;
 298     mib[1] = KERN_OSREV;
 299
 300     len = sizeof(osrev);
 301     sysctl(mib, 2, &osrev, &len, NULL, 0);
 302
 303     /* If we're older than 2.0... */
 304     if (osrev < 200000000) {
 305         fprintf(stderr, "osrev = %d (needed at least 200000000).\n", osrev);
 306         lose("NetBSD kernel too old to run sbcl.\n");
 307     }
 308
 309     /* NetBSD counts mmap()ed space against the process's data size limit,
 310      * so yank it up. This might be a nasty thing to do? */
 311     getrlimit (RLIMIT_DATA, &rl);
 312     /* Amazingly for such a new port, the provenance and meaning of
 313        this number are unknown.  It might just mean REALLY_BIG_LIMIT,
 314        or possibly it should be calculated from dynamic space size.
 315        -- CSR, 2004-04-08 */
 316     rl.rlim_cur = 1073741824;
 317     if (setrlimit (RLIMIT_DATA, &rl) < 0) {
 318         fprintf (stderr,
 319                  "RUNTIME WARNING: unable to raise process data size limit:\n\
 320   %s.\n\
 321 The system may fail to start.\n",
 322                  strerror(errno));
 323     }
 324 }
 325
 326 /* Various routines in NetBSD's C library are compatibility wrappers
 327    for old versions. Programs must be processed by the C toolchain in
 328    order to get up-to-date definitions of such routines. */
 329 /* The stat-family, opendir, and readdir are used only in sb-posix, as
 330    of 2007-01-16. -- RMK */
 331 int
 332 _stat(const char *path, struct stat *sb)
 333 {
 334     return stat(path, sb);
 335 }
 336 int
 337 _lstat(const char *path, struct stat *sb)
 338 {
 339     return lstat(path, sb);
 340 }
 341 int
 342 _fstat(int fd, struct stat *sb)
 343 {
 344     return fstat(fd, sb);
 345 }
 346
 347 DIR *
 348 _opendir(const char *filename)
 349 {
 350     return opendir(filename);
 351 }
 352 struct dirent *
 353 _readdir(DIR *dirp)
 354 {
 355     return readdir(dirp);
 356 }
 357
 358 /* Used in sb-bsd-sockets. */
 359 int
 360 _socket(int domain, int type, int protocol)
 361 {
 362     return socket(domain, type, protocol);
 363 }
 364 #endif /* __NetBSD__ */
 365
 366 #ifdef __FreeBSD__
 367 extern int getosreldate(void);
 368
 369 int sig_memory_fault;
 370
 371 static void freebsd_init()
 372 {
 373     /* Memory fault signal on FreeBSD was changed from SIGBUS to
 374      * SIGSEGV. */
 375     if (getosreldate() < 700004)
 376         sig_memory_fault = SIGBUS;
 377     else
 378         sig_memory_fault = SIGSEGV;
 379
 380     /* Quote from sbcl-devel (NIIMI Satoshi): "Some OSes, like FreeBSD
 381      * 4.x with GENERIC kernel, does not enable SSE support even on
 382      * SSE capable CPUs". Detect this situation and skip the
 383      * fast_bzero sse/base selection logic that's normally done in
 384      * x86-assem.S.
 385      */
 386 #ifdef LISP_FEATURE_X86
 387     size_t len;
 388     int instruction_sse;
 389
 390     len = sizeof(instruction_sse);
 391     if (sysctlbyname("hw.instruction_sse", &instruction_sse, &len, NULL, 0) == 0
 392         && instruction_sse != 0) {
 393         /* Use the SSE detector */
 394         fast_bzero_pointer = fast_bzero_detect;
 395     }
 396 #endif /* LISP_FEATURE_X86 */
 397 }
 398
 399 #if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
 400 int
 401 futex_wait(int *lock_word, long oldval, long sec, unsigned long usec)
 402 {
 403     struct timespec timeout;
 404     int ret;
 405
 406 again:
 407     if (sec < 0)
 408         ret = umtx_wait((void *)lock_word, oldval, NULL);
 409     else {
 410         timeout.tv_sec = sec;
 411         timeout.tv_nsec = usec * 1000;
 412         ret = umtx_wait((void *)lock_word, oldval, &timeout);
 413     }
 414
 415     switch (ret) {
 416     case 0:
 417         return 0;
 418     case ETIMEDOUT:
 419         return 1;
 420     case EINTR:
 421         /* spurious wakeup from interrupt */
 422         goto again;
 423     default:
 424         /* EWOULDBLOCK and others, need to check the lock */
 425         return -1;
 426     }
 427 }
 428
 429 int
 430 futex_wake(int *lock_word, int n)
 431 {
 432     return umtx_wake((void *)lock_word, n);
 433 }
 434 #endif
 435 #endif /* __FreeBSD__ */
 436
 437 #ifdef LISP_FEATURE_DARWIN
 438 /* defined in ppc-darwin-os.c instead */
 439 #elif defined(LISP_FEATURE_FREEBSD)
 440 #ifndef KERN_PROC_PATHNAME
 441 #define KERN_PROC_PATHNAME 12
 442 #endif
 443
 444 char *
 445 os_get_runtime_executable_path()
 446 {
 447     char path[PATH_MAX + 1];
 448
 449     if (getosreldate() >= 600024) {
 450         /* KERN_PROC_PATHNAME is available */
 451         size_t len = PATH_MAX + 1;
 452         int mib[4];
 453
 454         mib[0] = CTL_KERN;
 455         mib[1] = KERN_PROC;
 456         mib[2] = KERN_PROC_PATHNAME;
 457         mib[3] = -1;
 458         if (sysctl(mib, 4, &path, &len, NULL, 0) != 0)
 459             return NULL;
 460     } else {
 461         int size;
 462         size = readlink("/proc/curproc/file", path, sizeof(path) - 1);
 463         if (size < 0)
 464             return NULL;
 465         path[size] = '\0';
 466     }
 467     if (strcmp(path, "unknown") == 0)
 468         return NULL;
 469     return copied_string(path);
 470 }
 471 #elif defined(LISP_FEATURE_NETBSD)
 472 char *
 473 os_get_runtime_executable_path()
 474 {
 475     struct stat sb;
 476     char *path = strdup("/proc/curproc/file");
 477     if (path && ((stat(path, &sb)) == 0))
 478         return path;
 479     else {
 480         fprintf(stderr, "Couldn't stat /proc/curproc/file; is /proc mounted?\n");
 481         return NULL;
 482     }
 483 }
 484 #else /* Not DARWIN or FREEBSD or NETBSD */
 485 char *
 486 os_get_runtime_executable_path()
 487 {
 488     return NULL;
 489 }
 490 #endif