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
  63 static void freebsd_init();
  64 #endif /* __FreeBSD__ */
  65
  66 void
  67 os_init(char *argv[], char *envp[])
  68 {
  69     os_vm_page_size = getpagesize();
  70
  71 #ifdef __NetBSD__
  72     netbsd_init();
  73 #elif defined(__FreeBSD__)
  74     freebsd_init();
  75 #endif
  76 }
  77
  78 sigset_t *
  79 os_context_sigmask_addr(os_context_t *context)
  80 {
  81     /* (Unlike most of the other context fields that we access, the
  82      * signal mask field is a field of the basic, outermost context
  83      * struct itself both in FreeBSD 4.0 and in OpenBSD 2.6.) */
  84 #if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(LISP_FEATURE_DARWIN)
  85     return &context->uc_sigmask;
  86 #elif defined (__OpenBSD__)
  87     return &context->sc_mask;
  88 #else
  89 #error unsupported BSD variant
  90 #endif
  91 }
  92
  93 os_vm_address_t
  94 os_validate(os_vm_address_t addr, os_vm_size_t len)
  95 {
  96     int flags = MAP_PRIVATE | MAP_ANON;
  97
  98     if (addr)
  99         flags |= MAP_FIXED;
 100
 101     addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
 102
 103     if (addr == MAP_FAILED) {
 104         perror("mmap");
 105         return NULL;
 106     }
 107
 108     return addr;
 109 }
 110
 111 void
 112 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
 113 {
 114     if (munmap(addr, len) == -1)
 115         perror("munmap");
 116 }
 117
 118 os_vm_address_t
 119 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
 120 {
 121     addr = mmap(addr, len,
 122                 OS_VM_PROT_ALL,
 123                 MAP_PRIVATE | MAP_FILE | MAP_FIXED,
 124                 fd, (off_t) offset);
 125
 126     if (addr == MAP_FAILED) {
 127         perror("mmap");
 128         lose("unexpected mmap(..) failure\n");
 129     }
 130
 131     return addr;
 132 }
 133
 134 void
 135 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
 136 {
 137     if (mprotect(address, length, prot) == -1) {
 138         perror("mprotect");
 139     }
 140 }
 141 \f
 142 static boolean
 143 in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
 144 {
 145     char* beg = (char*) sbeg;
 146     char* end = (char*) sbeg + slen;
 147     char* adr = (char*) a;
 148     return (adr >= beg && adr < end);
 149 }
 150
 151 boolean
 152 is_valid_lisp_addr(os_vm_address_t addr)
 153 {
 154     struct thread *th;
 155
 156     if (in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 157         in_range_p(addr, STATIC_SPACE_START, STATIC_SPACE_SIZE) ||
 158         in_range_p(addr, DYNAMIC_SPACE_START, dynamic_space_size))
 159         return 1;
 160     for_each_thread(th) {
 161         if (((os_vm_address_t)th->control_stack_start <= addr) &&
 162             (addr < (os_vm_address_t)th->control_stack_end))
 163             return 1;
 164         if (in_range_p(addr, (lispobj) th->binding_stack_start,
 165                        BINDING_STACK_SIZE))
 166             return 1;
 167     }
 168     return 0;
 169 }
 170 \f
 171 /*
 172  * any OS-dependent special low-level handling for signals
 173  */
 174
 175 #if defined LISP_FEATURE_GENCGC
 176
 177 /*
 178  * The GENCGC needs to be hooked into whatever signal is raised for
 179  * page fault on this OS.
 180  */
 181
 182 void
 183 memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context
 184 #if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
 185 /* FreeBSD/amd64 stores fault address only in undocumented 4th arg. */
 186                      ,void *fault_addr
 187 #endif
 188     )
 189 {
 190     os_context_t *context = arch_os_get_context(&void_context);
 191 #if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
 192     /* KLUDGE: Store fault address into si_addr for compatibilities. */
 193     siginfo->si_addr = fault_addr;
 194 #else
 195     void *fault_addr = arch_get_bad_addr(signal, siginfo, context);
 196 #endif
 197
 198 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
 199     FSHOW_SIGNAL((stderr, "/ TLS: restoring fs: %p in memory_fault_handler\n",
 200                   *CONTEXT_ADDR_FROM_STEM(fs)));
 201     os_restore_tls_segment_register(context);
 202 #endif
 203
 204     FSHOW((stderr, "Memory fault at: %p, PC: %p\n", fault_addr, *os_context_pc_addr(context)));
 205
 206     if (!gencgc_handle_wp_violation(fault_addr))
 207         if(!handle_guard_page_triggered(context,fault_addr)) {
 208 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 209             lisp_memory_fault_error(context, fault_addr);
 210 #else
 211             if (!maybe_gc(context)) {
 212                 interrupt_handle_now(signal, siginfo, context);
 213             }
 214 #if defined(LISP_FEATURE_DARWIN)
 215             /* Work around G5 bug; fix courtesy gbyers */
 216             DARWIN_FIX_CONTEXT(context);
 217 #endif
 218 #endif
 219         }
 220 }
 221
 222 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 223 void
 224 mach_error_memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context) {
 225     lose("Unhandled memory fault. Exiting.");
 226 }
 227 #endif
 228
 229 void
 230 os_install_interrupt_handlers(void)
 231 {
 232     SHOW("os_install_interrupt_handlers()/bsd-os/defined(GENCGC)");
 233 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 234     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 235                                                  mach_error_memory_fault_handler);
 236 #else
 237     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 238 #ifdef LISP_FEATURE_FREEBSD
 239                                                  (__siginfohandler_t *)
 240 #endif
 241                                                  memory_fault_handler);
 242 #ifdef SIG_MEMORY_FAULT2
 243     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT2,
 244 #ifdef LISP_FEATURE_FREEBSD
 245                                                  (__siginfohandler_t *)
 246 #endif
 247                                                  memory_fault_handler);
 248 #endif
 249 #endif
 250
 251 #ifdef LISP_FEATURE_SB_THREAD
 252     undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
 253                                                  interrupt_thread_handler);
 254     undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
 255                                                  sig_stop_for_gc_handler);
 256 #ifdef SIG_RESUME_FROM_GC
 257     undoably_install_low_level_interrupt_handler(SIG_RESUME_FROM_GC,
 258                                                  sig_stop_for_gc_handler);
 259 #endif
 260 #endif
 261     SHOW("leaving os_install_interrupt_handlers()");
 262 }
 263
 264 #else /* Currently PPC/Darwin/Cheney only */
 265
 266 static void
 267 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 268 {
 269     os_context_t *context = arch_os_get_context(&void_context);
 270 #if 0
 271     unsigned int pc =  (unsigned int *)(*os_context_pc_addr(context));
 272 #endif
 273     os_vm_address_t addr;
 274
 275     addr = arch_get_bad_addr(signal, info, context);
 276     if (!cheneygc_handle_wp_violation(context, addr))
 277         if (!handle_guard_page_triggered(context, addr))
 278             interrupt_handle_now(signal, info, context);
 279     /* Work around G5 bug; fix courtesy gbyers */
 280     DARWIN_FIX_CONTEXT(context);
 281 }
 282
 283 void
 284 os_install_interrupt_handlers(void)
 285 {
 286     SHOW("os_install_interrupt_handlers()/bsd-os/!defined(GENCGC)");
 287     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 288                                                  sigsegv_handler);
 289 #ifdef SIG_MEMORY_FAULT2
 290     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT2,
 291                                                  sigsegv_handler);
 292 #endif
 293 }
 294
 295 #endif /* defined GENCGC */
 296
 297 #ifdef __NetBSD__
 298 static void netbsd_init()
 299 {
 300     struct rlimit rl;
 301     int mib[2], osrev;
 302     size_t len;
 303
 304     /* Are we running on a sufficiently functional kernel? */
 305     mib[0] = CTL_KERN;
 306     mib[1] = KERN_OSREV;
 307
 308     len = sizeof(osrev);
 309     sysctl(mib, 2, &osrev, &len, NULL, 0);
 310
 311     /* If we're older than 2.0... */
 312     if (osrev < 200000000) {
 313         fprintf(stderr, "osrev = %d (needed at least 200000000).\n", osrev);
 314         lose("NetBSD kernel too old to run sbcl.\n");
 315     }
 316
 317     /* NetBSD counts mmap()ed space against the process's data size limit,
 318      * so yank it up. This might be a nasty thing to do? */
 319     getrlimit (RLIMIT_DATA, &rl);
 320     /* Amazingly for such a new port, the provenance and meaning of
 321        this number are unknown.  It might just mean REALLY_BIG_LIMIT,
 322        or possibly it should be calculated from dynamic space size.
 323        -- CSR, 2004-04-08 */
 324     rl.rlim_cur = 1073741824;
 325     if (setrlimit (RLIMIT_DATA, &rl) < 0) {
 326         fprintf (stderr,
 327                  "RUNTIME WARNING: unable to raise process data size limit:\n\
 328   %s.\n\
 329 The system may fail to start.\n",
 330                  strerror(errno));
 331     }
 332 }
 333
 334 /* Various routines in NetBSD's C library are compatibility wrappers
 335    for old versions. Programs must be processed by the C toolchain in
 336    order to get up-to-date definitions of such routines. */
 337 /* The stat-family, opendir, and readdir are used only in sb-posix, as
 338    of 2007-01-16. -- RMK */
 339 int
 340 _stat(const char *path, struct stat *sb)
 341 {
 342     return stat(path, sb);
 343 }
 344 int
 345 _lstat(const char *path, struct stat *sb)
 346 {
 347     return lstat(path, sb);
 348 }
 349 int
 350 _fstat(int fd, struct stat *sb)
 351 {
 352     return fstat(fd, sb);
 353 }
 354
 355 DIR *
 356 _opendir(const char *filename)
 357 {
 358     return opendir(filename);
 359 }
 360 struct dirent *
 361 _readdir(DIR *dirp)
 362 {
 363     return readdir(dirp);
 364 }
 365
 366 /* Used in sb-bsd-sockets. */
 367 int
 368 _socket(int domain, int type, int protocol)
 369 {
 370     return socket(domain, type, protocol);
 371 }
 372 #endif /* __NetBSD__ */
 373
 374 #ifdef __FreeBSD__
 375 static void freebsd_init()
 376 {
 377     /* Quote from sbcl-devel (NIIMI Satoshi): "Some OSes, like FreeBSD
 378      * 4.x with GENERIC kernel, does not enable SSE support even on
 379      * SSE capable CPUs". Detect this situation and skip the
 380      * fast_bzero sse/base selection logic that's normally done in
 381      * x86-assem.S.
 382      */
 383 #ifdef LISP_FEATURE_X86
 384     size_t len;
 385     int instruction_sse;
 386
 387     len = sizeof(instruction_sse);
 388     if (sysctlbyname("hw.instruction_sse", &instruction_sse, &len, NULL, 0) == 0
 389         && instruction_sse != 0) {
 390         /* Use the SSE detector */
 391         fast_bzero_pointer = fast_bzero_detect;
 392     }
 393 #endif /* LISP_FEATURE_X86 */
 394 }
 395 #endif /* __FreeBSD__ */
 396
 397 #ifdef LISP_FEATURE_DARWIN
 398 /* defined in ppc-darwin-os.c instead */
 399 #elif defined(LISP_FEATURE_FREEBSD)
 400 #ifndef KERN_PROC_PATHNAME
 401 #define KERN_PROC_PATHNAME 12
 402 #endif
 403
 404 extern int getosreldate(void);
 405
 406 char *
 407 os_get_runtime_executable_path()
 408 {
 409     char path[PATH_MAX + 1];
 410
 411     if (getosreldate() >= 600024) {
 412         /* KERN_PROC_PATHNAME is available */
 413         size_t len = PATH_MAX + 1;
 414         int mib[4];
 415
 416         mib[0] = CTL_KERN;
 417         mib[1] = KERN_PROC;
 418         mib[2] = KERN_PROC_PATHNAME;
 419         mib[3] = -1;
 420         if (sysctl(mib, 4, &path, &len, NULL, 0) != 0)
 421             return NULL;
 422     } else {
 423         int size;
 424         size = readlink("/proc/curproc/file", path, sizeof(path) - 1);
 425         if (size < 0)
 426             return NULL;
 427         path[size] = '\0';
 428     }
 429     if (strcmp(path, "unknown") == 0)
 430         return NULL;
 431     return copied_string(path);
 432 }
 433 #elif defined(LISP_FEATURE_NETBSD)
 434 char *
 435 os_get_runtime_executable_path()
 436 {
 437     struct stat sb;
 438     char *path = strdup("/proc/curproc/file");
 439     if (path && ((stat(path, &sb)) == 0))
 440         return path;
 441     else {
 442         fprintf(stderr, "Couldn't stat /proc/curproc/file; is /proc mounted?\n");
 443         return NULL;
 444     }
 445 }
 446 #else /* Not DARWIN or FREEBSD or NETBSD */
 447 char *
 448 os_get_runtime_executable_path()
 449 {
 450     return NULL;
 451 }
 452 #endif