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 "os.h"
  12 #include "arch.h"
  13 #include "interr.h"
  14 #include "interrupt.h"
  15 #include "globals.h"
  16 #include "validate.h"
  17 #include "sbcl.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) || (minor_version == 9)) {
  54         KLUDGE_MAYBE_MAP_ANON = 0x100;
  55     } else if (minor_version > 9) {
  56         FSHOW((stderr, "os_init: Solaris version greater than 9?\nUnknown MAP_ANON behaviour.\n"));
  57         lose("Unknown mmap() interaction with MAP_ANON");
  58     } else { /* minor_version < 8 */
  59         kludge_mmap_fd = open("/dev/zero",O_RDONLY);
  60         if (kludge_mmap_fd < 0) {
  61             perror("open");
  62             lose("Error in open(..)");
  63         }
  64     }
  65
  66     /* I do not understand this at all. FIXME. */
  67     os_vm_page_size = os_real_page_size = sysconf(_SC_PAGESIZE);
  68
  69     if(os_vm_page_size>OS_VM_DEFAULT_PAGESIZE){
  70         fprintf(stderr,"os_init: Pagesize too large (%d > %d)\n",
  71                 os_vm_page_size,OS_VM_DEFAULT_PAGESIZE);
  72         exit(1);
  73     } else {
  74         /*
  75          * we do this because there are apparently dependencies on
  76          * the pagesize being OS_VM_DEFAULT_PAGESIZE somewhere...
  77          * but since the OS doesn't know we're using this restriction,
  78          * we have to grovel around a bit to enforce it, thus anything
  79          * that uses real_page_size_difference.
  80          */
  81         /* FIXME: Is this still true? */
  82         real_page_size_difference=OS_VM_DEFAULT_PAGESIZE-os_vm_page_size;
  83         os_vm_page_size=OS_VM_DEFAULT_PAGESIZE;
  84     }
  85 }
  86
  87 os_vm_address_t os_validate(os_vm_address_t addr, os_vm_size_t len)
  88 {
  89     int flags = MAP_PRIVATE | MAP_NORESERVE | KLUDGE_MAYBE_MAP_ANON;
  90     if (addr)
  91         flags |= MAP_FIXED;
  92
  93     addr = mmap(addr, len,
  94                 OS_VM_PROT_ALL,
  95                 flags,
  96                 kludge_mmap_fd, 0);
  97
  98     if (addr == MAP_FAILED) {
  99         perror("mmap");
 100         lose ("Error in mmap(..)");
 101     }
 102
 103     return addr;
 104 }
 105
 106 void os_invalidate(os_vm_address_t addr, os_vm_size_t len)
 107 {
 108     if(munmap((void*) addr, len) == -1)
 109         perror("munmap");
 110 }
 111
 112 \f
 113
 114 os_vm_address_t
 115 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
 116 {
 117
 118     addr = mmap(addr, len,
 119                 OS_VM_PROT_ALL,
 120                 MAP_PRIVATE | MAP_FIXED,
 121                 fd, (off_t) offset);
 122
 123     if (addr == MAP_FAILED) {
 124         perror("mmap");
 125         lose("Unexpedted mmap(..) failure");
 126     }
 127
 128     return addr;
 129 }
 130
 131 void
 132 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
 133 {
 134     if(mprotect((void*)address, length, prot) == -1) {
 135         perror("mprotect");
 136     }
 137 }
 138
 139 static boolean in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
 140 {
 141     char* beg = (char*) sbeg;
 142     char* end = (char*) sbeg + slen;
 143     char* adr = (char*) a;
 144     return (adr >= beg && adr < end);
 145 }
 146
 147 boolean is_valid_lisp_addr(os_vm_address_t addr)
 148 {
 149     /* Old CMUCL comment:
 150
 151        Just assume address is valid if it lies within one of the known
 152        spaces.  (Unlike sunos-os which keeps track of every valid page.) */
 153
 154     /* FIXME: this looks like a valid definition for all targets with
 155        cheney-gc; it may not be impressively smart (witness the
 156        comment above) but maybe associating these functions with the
 157        GC rather than the OS would be a maintainability win.  -- CSR,
 158        2003-04-04 */
 159     struct thread *th;
 160     if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 161        in_range_p(addr, STATIC_SPACE_START   , STATIC_SPACE_SIZE) ||
 162        in_range_p(addr, DYNAMIC_0_SPACE_START, DYNAMIC_SPACE_SIZE) ||
 163        in_range_p(addr, DYNAMIC_1_SPACE_START, DYNAMIC_SPACE_SIZE))
 164         return 1;
 165     for_each_thread(th) {
 166         if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
 167             return 1;
 168         if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
 169             return 1;
 170     }
 171     return 0;
 172 }
 173 \f
 174
 175
 176 static void
 177 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 178 {
 179     os_context_t *context = arch_os_get_context(&void_context);
 180     os_vm_address_t addr;
 181
 182     addr = arch_get_bad_addr(signal, info, context);
 183     if(!interrupt_maybe_gc(signal, info, context)) {
 184         if(!handle_control_stack_guard_triggered(context,addr))
 185             interrupt_handle_now(signal, info, context);
 186     }
 187 }
 188
 189 void
 190 os_install_interrupt_handlers()
 191 {
 192     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 193                                                  sigsegv_handler);
 194 }