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 #define OS_VM_DEFAULT_PAGESIZE 8192
  21
  22 long os_vm_page_size=(-1);
  23 static long os_real_page_size=(-1);
  24
  25 static os_vm_size_t real_page_size_difference=0;
  26
  27 /* So, this sucks. Versions of Solaris prior to 8 (SunOS releases
  28    earlier than 5.8) do not support MAP_ANON passed as a flag to
  29    mmap(). However, we would like SBCL compiled on SunOS 5.7 but
  30    running on 5.8 to use MAP_ANON, but because of C's lack of
  31    introspection at runtime, we can't grab the right value because
  32    it's stuffed in a header file somewhere. We can, however, hardcode
  33    it, and test at runtime for whether to use it... -- CSR, 2002-05-06
  34
  35    And, in fact, it sucks slightly more, as if you don't use MAP_ANON
  36    you need to have /dev/zero open and pass the file descriptor to
  37    mmap().  So overall, this counts as a KLUDGE. -- CSR, 2002-05-20 */
  38 int KLUDGE_MAYBE_MAP_ANON = 0x0;
  39 int kludge_mmap_fd = -1; /* default for MAP_ANON */
  40
  41 void os_init(void)
  42 {
  43     struct utsname name;
  44     int major_version;
  45     int minor_version;
  46
  47     uname(&name);
  48     major_version = atoi(name.release);
  49     if (major_version != 5) {
  50         lose("sunos major version=%d (which isn't 5!)", major_version);
  51     }
  52     minor_version = atoi(name.release+2);
  53     if ((minor_version == 8) ||
  54         (minor_version == 9) ||
  55         (minor_version == 10)) {
  56         KLUDGE_MAYBE_MAP_ANON = 0x100;
  57     } else if (minor_version > 10) {
  58         FSHOW((stderr, "os_init: Solaris version greater than 9?\nUnknown MAP_ANON behaviour.\n"));
  59         lose("Unknown mmap() interaction with MAP_ANON");
  60     } else { /* minor_version < 8 */
  61         kludge_mmap_fd = open("/dev/zero",O_RDONLY);
  62         if (kludge_mmap_fd < 0) {
  63             perror("open");
  64             lose("Error in open(..)");
  65         }
  66     }
  67
  68     /* I do not understand this at all. FIXME. */
  69     os_vm_page_size = os_real_page_size = sysconf(_SC_PAGESIZE);
  70
  71     if(os_vm_page_size>OS_VM_DEFAULT_PAGESIZE){
  72         fprintf(stderr,"os_init: Pagesize too large (%d > %d)\n",
  73                 os_vm_page_size,OS_VM_DEFAULT_PAGESIZE);
  74         exit(1);
  75     } else {
  76         /*
  77          * we do this because there are apparently dependencies on
  78          * the pagesize being OS_VM_DEFAULT_PAGESIZE somewhere...
  79          * but since the OS doesn't know we're using this restriction,
  80          * we have to grovel around a bit to enforce it, thus anything
  81          * that uses real_page_size_difference.
  82          */
  83         /* FIXME: Is this still true? */
  84         real_page_size_difference=OS_VM_DEFAULT_PAGESIZE-os_vm_page_size;
  85         os_vm_page_size=OS_VM_DEFAULT_PAGESIZE;
  86     }
  87 }
  88
  89 os_vm_address_t os_validate(os_vm_address_t addr, os_vm_size_t len)
  90 {
  91     int flags = MAP_PRIVATE | MAP_NORESERVE | KLUDGE_MAYBE_MAP_ANON;
  92     if (addr)
  93         flags |= MAP_FIXED;
  94
  95     addr = mmap(addr, len,
  96                 OS_VM_PROT_ALL,
  97                 flags,
  98                 kludge_mmap_fd, 0);
  99
 100     if (addr == MAP_FAILED) {
 101         perror("mmap");
 102         lose ("Error in mmap(..)");
 103     }
 104
 105     return addr;
 106 }
 107
 108 void os_invalidate(os_vm_address_t addr, os_vm_size_t len)
 109 {
 110     if(munmap((void*) addr, len) == -1)
 111         perror("munmap");
 112 }
 113
 114 \f
 115
 116 os_vm_address_t
 117 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
 118 {
 119
 120     addr = mmap(addr, len,
 121                 OS_VM_PROT_ALL,
 122                 MAP_PRIVATE | MAP_FIXED,
 123                 fd, (off_t) offset);
 124
 125     if (addr == MAP_FAILED) {
 126         perror("mmap");
 127         lose("Unexpedted mmap(..) failure");
 128     }
 129
 130     return addr;
 131 }
 132
 133 void
 134 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
 135 {
 136     if(mprotect((void*)address, length, prot) == -1) {
 137         perror("mprotect");
 138     }
 139 }
 140
 141 static boolean in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
 142 {
 143     char* beg = (char*) sbeg;
 144     char* end = (char*) sbeg + slen;
 145     char* adr = (char*) a;
 146     return (adr >= beg && adr < end);
 147 }
 148
 149 boolean is_valid_lisp_addr(os_vm_address_t addr)
 150 {
 151     /* Old CMUCL comment:
 152
 153        Just assume address is valid if it lies within one of the known
 154        spaces.  (Unlike sunos-os which keeps track of every valid page.) */
 155
 156     /* FIXME: this looks like a valid definition for all targets with
 157        cheney-gc; it may not be impressively smart (witness the
 158        comment above) but maybe associating these functions with the
 159        GC rather than the OS would be a maintainability win.  -- CSR,
 160        2003-04-04 */
 161     struct thread *th;
 162     if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 163        in_range_p(addr, STATIC_SPACE_START   , STATIC_SPACE_SIZE) ||
 164        in_range_p(addr, DYNAMIC_0_SPACE_START, DYNAMIC_SPACE_SIZE) ||
 165        in_range_p(addr, DYNAMIC_1_SPACE_START, DYNAMIC_SPACE_SIZE))
 166         return 1;
 167     for_each_thread(th) {
 168         if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
 169             return 1;
 170         if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
 171             return 1;
 172     }
 173     return 0;
 174 }
 175 \f
 176
 177
 178 static void
 179 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 180 {
 181     os_context_t *context = arch_os_get_context(&void_context);
 182     os_vm_address_t addr;
 183
 184     addr = arch_get_bad_addr(signal, info, context);
 185     if(!interrupt_maybe_gc(signal, info, context)) {
 186         if(!handle_guard_page_triggered(context,addr))
 187             interrupt_handle_now(signal, info, context);
 188     }
 189 }
 190
 191 void
 192 os_install_interrupt_handlers()
 193 {
 194     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 195                                                  sigsegv_handler);
 196 }