src/runtime/sunos-os.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <signal.h>
   4 #include <sys/file.h>
   5
   6 #include <unistd.h>
   7 #include <errno.h>
   8 #include <sys/param.h>
   9 #include <sys/utsname.h>
  10
  11 #include "sbcl.h"
  12 #include "os.h"
  13 #include "arch.h"
  14 #include "interr.h"
  15 #include "interrupt.h"
  16 #include "globals.h"
  17 #include "validate.h"
  18 #include "target-arch-os.h"
  19
  20 #ifdef LISP_FEATURE_X86
  21 #include "genesis/static-symbols.h"
  22 #include "genesis/fdefn.h"
  23 #endif
  24
  25 #ifdef LISP_FEATURE_GENCGC
  26 #include "gencgc-internal.h"
  27 #endif
  28
  29 #if defined LISP_FEATURE_SPARC
  30 #define OS_VM_DEFAULT_PAGESIZE 8192
  31 #elif defined LISP_FEATURE_X86
  32 #define OS_VM_DEFAULT_PAGESIZE 4096
  33 #else
  34 #error "Don't know OS_VM_DEFAULT_PAGESIZE"
  35 #endif
  36
  37 long os_vm_page_size=(-1);
  38 static long os_real_page_size=(-1);
  39
  40 static os_vm_size_t real_page_size_difference=0;
  41
  42 /* So, this sucks. Versions of Solaris prior to 8 (SunOS releases
  43    earlier than 5.8) do not support MAP_ANON passed as a flag to
  44    mmap(). However, we would like SBCL compiled on SunOS 5.7 but
  45    running on 5.8 to use MAP_ANON, but because of C's lack of
  46    introspection at runtime, we can't grab the right value because
  47    it's stuffed in a header file somewhere. We can, however, hardcode
  48    it, and test at runtime for whether to use it... -- CSR, 2002-05-06
  49
  50    And, in fact, it sucks slightly more, as if you don't use MAP_ANON
  51    you need to have /dev/zero open and pass the file descriptor to
  52    mmap().  So overall, this counts as a KLUDGE. -- CSR, 2002-05-20 */
  53 int KLUDGE_MAYBE_MAP_ANON = 0x0;
  54 int kludge_mmap_fd = -1; /* default for MAP_ANON */
  55
  56 void
  57 os_init(char *argv[], char *envp[])
  58 {
  59     struct utsname name;
  60     int major_version;
  61     int minor_version;
  62
  63     uname(&name);
  64     major_version = atoi(name.release);
  65     if (major_version != 5) {
  66         lose("sunos major version=%d (which isn't 5!)\n", major_version);
  67     }
  68     minor_version = atoi(name.release+2);
  69     if ((minor_version < 8)) {
  70         kludge_mmap_fd = open("/dev/zero",O_RDONLY);
  71         if (kludge_mmap_fd < 0) {
  72             perror("open");
  73             lose("Error in open(..)\n");
  74         }
  75     } else if (minor_version > 11) {
  76         FSHOW((stderr, "os_init: Solaris version greater than 11?\nUnknown MAP_ANON behaviour.\n"));
  77         lose("Unknown mmap() interaction with MAP_ANON\n");
  78     } else {
  79         /* Versions 8-11*/
  80         KLUDGE_MAYBE_MAP_ANON = 0x100;
  81     }
  82
  83     /* I do not understand this at all. FIXME. */
  84     os_vm_page_size = os_real_page_size = sysconf(_SC_PAGESIZE);
  85
  86     if(os_vm_page_size>OS_VM_DEFAULT_PAGESIZE){
  87         fprintf(stderr,"os_init: Pagesize too large (%d > %d)\n",
  88                 os_vm_page_size,OS_VM_DEFAULT_PAGESIZE);
  89         exit(1);
  90     } else {
  91         /*
  92          * we do this because there are apparently dependencies on
  93          * the pagesize being OS_VM_DEFAULT_PAGESIZE somewhere...
  94          * but since the OS doesn't know we're using this restriction,
  95          * we have to grovel around a bit to enforce it, thus anything
  96          * that uses real_page_size_difference.
  97          */
  98         /* FIXME: Is this still true? */
  99         real_page_size_difference=OS_VM_DEFAULT_PAGESIZE-os_vm_page_size;
 100         os_vm_page_size=OS_VM_DEFAULT_PAGESIZE;
 101     }
 102 }
 103
 104 os_vm_address_t os_validate(os_vm_address_t addr, os_vm_size_t len)
 105 {
 106     int flags = MAP_PRIVATE | MAP_NORESERVE | KLUDGE_MAYBE_MAP_ANON;
 107     if (addr)
 108         flags |= MAP_FIXED;
 109
 110     addr = mmap(addr, len,
 111                 OS_VM_PROT_ALL,
 112                 flags,
 113                 kludge_mmap_fd, 0);
 114
 115     if (addr == MAP_FAILED) {
 116         perror("mmap");
 117         lose ("Error in mmap(..)\n");
 118     }
 119
 120     return addr;
 121 }
 122
 123 void os_invalidate(os_vm_address_t addr, os_vm_size_t len)
 124 {
 125     if(munmap((void*) addr, len) == -1)
 126         perror("munmap");
 127 }
 128
 129 \f
 130
 131 os_vm_address_t
 132 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
 133 {
 134
 135     addr = mmap(addr, len,
 136                 OS_VM_PROT_ALL,
 137                 MAP_PRIVATE | MAP_FIXED,
 138                 fd, (off_t) offset);
 139
 140     if (addr == MAP_FAILED) {
 141         perror("mmap");
 142         lose("Unexpedted 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((void*)address, length, prot) == -1) {
 152         perror("mprotect");
 153     }
 154 }
 155
 156 static boolean in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
 157 {
 158     char* beg = (char*) sbeg;
 159     char* end = (char*) sbeg + slen;
 160     char* adr = (char*) a;
 161     return (adr >= beg && adr < end);
 162 }
 163
 164 boolean is_valid_lisp_addr(os_vm_address_t addr)
 165 {
 166     /* Old CMUCL comment:
 167
 168        Just assume address is valid if it lies within one of the known
 169        spaces.  (Unlike sunos-os which keeps track of every valid page.) */
 170
 171     /* FIXME: this looks like a valid definition for all targets with
 172        cheney-gc; it may not be impressively smart (witness the
 173        comment above) but maybe associating these functions with the
 174        GC rather than the OS would be a maintainability win.  -- CSR,
 175        2003-04-04 */
 176     struct thread *th;
 177     if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 178        in_range_p(addr, STATIC_SPACE_START   , STATIC_SPACE_SIZE) ||
 179 #ifdef LISP_FEATURE_GENCGC
 180        in_range_p(addr, DYNAMIC_SPACE_START  , dynamic_space_size)
 181 #else
 182        in_range_p(addr, DYNAMIC_0_SPACE_START, dynamic_space_size) ||
 183        in_range_p(addr, DYNAMIC_1_SPACE_START, dynamic_space_size)
 184 #endif
 185        )
 186         return 1;
 187     for_each_thread(th) {
 188         if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
 189             return 1;
 190         if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
 191             return 1;
 192     }
 193     return 0;
 194 }
 195 \f
 196
 197 #if defined LISP_FEATURE_GENCGC
 198
 199 void
 200 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 201 {
 202     os_context_t *context = arch_os_get_context(&void_context);
 203     void* fault_addr = (void*)info->si_addr;
 204
 205     if (!gencgc_handle_wp_violation(fault_addr))
 206          if(!handle_guard_page_triggered(context, fault_addr))
 207 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 208              lisp_memory_fault_error(context, fault_addr);
 209 #else
 210             interrupt_handle_now(signal, info, context);
 211 #endif
 212 }
 213
 214 #else
 215
 216 static void
 217 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 218 {
 219     os_context_t *context = arch_os_get_context(&void_context);
 220     os_vm_address_t addr = arch_get_bad_addr(signal, info, context);
 221
 222     if (!cheneygc_handle_wp_violation(context, addr)) {
 223         if (!handle_guard_page_triggered(context,addr))
 224             interrupt_handle_now(signal, info, context);
 225     }
 226 }
 227
 228 #endif
 229
 230 void
 231 os_install_interrupt_handlers()
 232 {
 233     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 234                                                  sigsegv_handler);
 235
 236 #ifdef LISP_FEATURE_SB_THREAD
 237     undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
 238                                                  interrupt_thread_handler);
 239     undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
 240                                                  sig_stop_for_gc_handler);
 241 #endif
 242 }
 243
 244 char *
 245 os_get_runtime_executable_path()
 246 {
 247     int ret;
 248     char path[] = "/proc/self/object/a.out";
 249
 250     ret = access(path, R_OK);
 251     if (ret == -1)
 252         return NULL;
 253
 254     return copied_string(path);
 255 }
 256