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 os_vm_size_t os_vm_page_size=0;
  30
  31 void
  32 os_init(char *argv[], char *envp[])
  33 {
  34     /*
  35      * historically, this used sysconf to select the runtime page size
  36      * per recent changes on other arches and discussion on sbcl-devel,
  37      * however, this is not necessary -- the VM page size need not match
  38      * the OS page size (and the default backend page size has been
  39      * ramped up accordingly for efficiency reasons).
  40      */
  41     os_vm_page_size = BACKEND_PAGE_BYTES;
  42 }
  43
  44 os_vm_address_t os_validate(os_vm_address_t addr, os_vm_size_t len)
  45 {
  46     int flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANON;
  47     if (addr)
  48         flags |= MAP_FIXED;
  49
  50     addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
  51
  52     if (addr == MAP_FAILED) {
  53         perror("mmap");
  54         lose ("Error in mmap(..)\n");
  55     }
  56
  57     return addr;
  58 }
  59
  60 void os_invalidate(os_vm_address_t addr, os_vm_size_t len)
  61 {
  62     if(munmap((void*) addr, len) == -1)
  63         perror("munmap");
  64 }
  65
  66 \f
  67
  68 os_vm_address_t
  69 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
  70 {
  71
  72     addr = mmap(addr, len,
  73                 OS_VM_PROT_ALL,
  74                 MAP_PRIVATE | MAP_FIXED,
  75                 fd, (off_t) offset);
  76
  77     if (addr == MAP_FAILED) {
  78         perror("mmap");
  79         lose("Unexpedted mmap(..) failure\n");
  80     }
  81
  82     return addr;
  83 }
  84
  85 void
  86 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
  87 {
  88     if(mprotect((void*)address, length, prot) == -1) {
  89         perror("mprotect");
  90     }
  91 }
  92
  93 static boolean in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
  94 {
  95     char* beg = (char*) sbeg;
  96     char* end = (char*) sbeg + slen;
  97     char* adr = (char*) a;
  98     return (adr >= beg && adr < end);
  99 }
 100
 101 boolean is_valid_lisp_addr(os_vm_address_t addr)
 102 {
 103     /* Old CMUCL comment:
 104
 105        Just assume address is valid if it lies within one of the known
 106        spaces.  (Unlike sunos-os which keeps track of every valid page.) */
 107
 108     /* FIXME: this looks like a valid definition for all targets with
 109        cheney-gc; it may not be impressively smart (witness the
 110        comment above) but maybe associating these functions with the
 111        GC rather than the OS would be a maintainability win.  -- CSR,
 112        2003-04-04 */
 113     struct thread *th;
 114     if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
 115        in_range_p(addr, STATIC_SPACE_START   , STATIC_SPACE_SIZE) ||
 116 #ifdef LISP_FEATURE_GENCGC
 117        in_range_p(addr, DYNAMIC_SPACE_START  , dynamic_space_size)
 118 #else
 119        in_range_p(addr, DYNAMIC_0_SPACE_START, dynamic_space_size) ||
 120        in_range_p(addr, DYNAMIC_1_SPACE_START, dynamic_space_size)
 121 #endif
 122        )
 123         return 1;
 124     for_each_thread(th) {
 125         if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
 126             return 1;
 127         if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
 128             return 1;
 129     }
 130     return 0;
 131 }
 132 \f
 133
 134 #if defined LISP_FEATURE_GENCGC
 135
 136 void
 137 sigsegv_handler(int signal, siginfo_t *info, os_context_t *context)
 138 {
 139     void* fault_addr = (void*)info->si_addr;
 140
 141 #ifdef LISP_FEATURE_SB_SAFEPOINT
 142     if (handle_safepoint_violation(context, fault_addr))
 143             return;
 144 #endif
 145
 146     if (!gencgc_handle_wp_violation(fault_addr))
 147         if(!handle_guard_page_triggered(context, fault_addr))
 148             lisp_memory_fault_error(context, fault_addr);
 149 }
 150
 151 #else
 152
 153 static void
 154 sigsegv_handler(int signal, siginfo_t *info, os_context_t *context)
 155 {
 156     os_vm_address_t addr = arch_get_bad_addr(signal, info, context);
 157
 158     if (!cheneygc_handle_wp_violation(context, addr)) {
 159         if (!handle_guard_page_triggered(context,addr))
 160             lisp_memory_fault_error(context, addr);
 161     }
 162 }
 163
 164 #endif
 165
 166 void
 167 os_install_interrupt_handlers()
 168 {
 169     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
 170                                                  sigsegv_handler);
 171
 172 #ifdef LISP_FEATURE_SB_THREAD
 173 # ifndef LISP_FEATURE_SB_SAFEPOINT
 174     undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
 175                                                  sig_stop_for_gc_handler);
 176 # endif
 177 #endif
 178 }
 179
 180 char *
 181 os_get_runtime_executable_path(int external)
 182 {
 183     char path[] = "/proc/self/object/a.out";
 184
 185     if (external || access(path, R_OK) == -1)
 186         return NULL;
 187
 188     return copied_string(path);
 189 }
 190