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 "sbcl.h"
  27 #include "./signal.h"
  28 #include "os.h"
  29 #include "arch.h"
  30 #include "globals.h"
  31 #include "interrupt.h"
  32 #include "interr.h"
  33 #include "lispregs.h"
  34 #include "thread.h"
  35 #include "runtime.h"
  36 #include "genesis/static-symbols.h"
  37 #include "genesis/fdefn.h"
  38
  39 #include <sys/types.h>
  40 #include <signal.h>
  41 /* #include <sys/sysinfo.h> */
  42 #include "validate.h"
  43 \f
  44 os_vm_size_t os_vm_page_size;
  45
  46 #ifdef __NetBSD__
  47 #include <sys/resource.h>
  48 #include <sys/sysctl.h>
  49 #include <string.h>
  50
  51 static void netbsd_init();
  52 #endif /* __NetBSD__ */
  53
  54 void os_init(void)
  55 {
  56     os_vm_page_size = getpagesize();
  57
  58 #ifdef __NetBSD__
  59     netbsd_init();
  60 #endif /* __NetBSD__ */
  61 }
  62
  63 int *os_context_pc_addr(os_context_t *context)
  64 {
  65 #if defined __FreeBSD__
  66     return CONTEXT_ADDR_FROM_STEM(eip);
  67 #elif defined __OpenBSD__
  68     return CONTEXT_ADDR_FROM_STEM(pc);
  69 #elif defined __NetBSD__
  70     return CONTEXT_ADDR_FROM_STEM(EIP);
  71 #elif defined LISP_FEATURE_DARWIN
  72     return &context->uc_mcontext->ss.srr0;
  73 #else
  74 #error unsupported BSD variant
  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__  || __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");
 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     if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 156        in_range_p(addr, STATIC_SPACE_START   , STATIC_SPACE_SIZE) ||
 157        in_range_p(addr, DYNAMIC_SPACE_START  , DYNAMIC_SPACE_SIZE))
 158         return 1;
 159     for_each_thread(th) {
 160         if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
 161             return 1;
 162         if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
 163             return 1;
 164     }
 165     return 0;
 166 }
 167 \f
 168 /*
 169  * any OS-dependent special low-level handling for signals
 170  */
 171
 172 #if defined LISP_FEATURE_GENCGC
 173
 174 /*
 175  * The GENCGC needs to be hooked into whatever signal is raised for
 176  * page fault on this OS.
 177  */
 178 static void
 179 memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context)
 180 {
 181     /* The way that we extract low level information like the fault
 182      * address is not specified by POSIX. */
 183 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
 184     void *fault_addr = siginfo->si_addr;
 185 #elif defined LISP_FEATURE_DARWIN
 186     void *fault_addr = siginfo->si_addr;
 187 #else
 188 #error unsupported BSD variant
 189 #endif
 190
 191     os_context_t *context = arch_os_get_context(&void_context);
 192     if (!gencgc_handle_wp_violation(fault_addr))
 193         if(!handle_guard_page_triggered(context,fault_addr))
 194 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 195             arrange_return_to_lisp_function(context, SymbolFunction(MEMORY_FAULT_ERROR));
 196 #else
 197             interrupt_handle_now(signal, siginfo, context);
 198 #endif
 199 }
 200 void
 201 os_install_interrupt_handlers(void)
 202 {
 203     SHOW("os_install_interrupt_handlers()/bsd-os/defined(GENCGC)");
 204     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 205                                                  memory_fault_handler);
 206     SHOW("leaving os_install_interrupt_handlers()");
 207 }
 208
 209 #else /* Currently Darwin only */
 210
 211 static void
 212 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 213 {
 214     os_context_t *context = arch_os_get_context(&void_context);
 215     unsigned int pc =  (unsigned int *)(*os_context_pc_addr(context));
 216     os_vm_address_t addr;
 217
 218     addr = arch_get_bad_addr(signal,info,context);
 219     if(!interrupt_maybe_gc(signal, info, context))
 220         if(!handle_guard_page_triggered(context,addr))
 221             interrupt_handle_now(signal, info, context);
 222     /* Work around G5 bug; fix courtesy gbyers */
 223     DARWIN_FIX_CONTEXT(context);
 224 }
 225
 226 void
 227 os_install_interrupt_handlers(void)
 228 {
 229     SHOW("os_install_interrupt_handlers()/bsd-os/!defined(GENCGC)");
 230     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 231                                                  sigsegv_handler);
 232 }
 233
 234 #endif /* defined GENCGC */
 235
 236 #ifdef __NetBSD__
 237 static void netbsd_init()
 238 {
 239     struct rlimit rl;
 240     int mib[2], osrev;
 241     size_t len;
 242
 243     /* Are we running on a sufficiently functional kernel? */
 244     mib[0] = CTL_KERN;
 245     mib[1] = KERN_OSREV;
 246
 247     len = sizeof(osrev);
 248     sysctl(mib, 2, &osrev, &len, NULL, 0);
 249
 250     /* If we're older than 2.0... */
 251     if (osrev < 200000000) {
 252         fprintf(stderr, "osrev = %d (needed at least 200000000).\n", osrev);
 253         lose("NetBSD kernel too old to run sbcl.\n");
 254     }
 255
 256     /* NetBSD counts mmap()ed space against the process's data size limit,
 257      * so yank it up. This might be a nasty thing to do? */
 258     getrlimit (RLIMIT_DATA, &rl);
 259     /* Amazingly for such a new port, the provenance and meaning of
 260        this number are unknown.  It might just mean REALLY_BIG_LIMIT,
 261        or possibly it should be calculated from dynamic space size.
 262        -- CSR, 2004-04-08 */
 263     rl.rlim_cur = 1073741824;
 264     if (setrlimit (RLIMIT_DATA, &rl) < 0) {
 265         fprintf (stderr,
 266                  "RUNTIME WARNING: unable to raise process data size limit:\n\
 267   %s.\n\
 268 The system may fail to start.\n",
 269                  strerror(errno));
 270     }
 271 }
 272 #endif /* __NetBSD__ */
 273 \f
 274 /* threads */
 275
 276 /* no threading in any *BSD variant on any CPU (yet? in sbcl-0.8.0 anyway) */
 277 #ifdef LISP_FEATURE_SB_THREAD
 278 #error "Define threading support functions"
 279 #else
 280 int arch_os_thread_init(struct thread *thread) {
 281   stack_t sigstack;
 282 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 283     /* Signal handlers are run on the control stack, so if it is exhausted
 284      * we had better use an alternate stack for whatever signal tells us
 285      * we've exhausted it */
 286     sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
 287     sigstack.ss_flags=0;
 288     sigstack.ss_size = 32*SIGSTKSZ;
 289     sigaltstack(&sigstack,0);
 290 #endif
 291     return 1;                  /* success */
 292 }
 293 int arch_os_thread_cleanup(struct thread *thread) {
 294     return 1;                  /* success */
 295 }
 296 #endif