src/runtime/validate.c

   1 /*
   2  * memory validation
   3  */
   4
   5 /*
   6  * This software is part of the SBCL system. See the README file for
   7  * more information.
   8  *
   9  * This software is derived from the CMU CL system, which was
  10  * written at Carnegie Mellon University and released into the
  11  * public domain. The software is in the public domain and is
  12  * provided with absolutely no warranty. See the COPYING and CREDITS
  13  * files for more information.
  14  */
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18
  19 #include "runtime.h"
  20 #include "os.h"
  21 #include "globals.h"
  22 #include "sbcl.h"
  23 #include "validate.h"
  24
  25 static void
  26 ensure_space(lispobj *start, unsigned long size)
  27 {
  28     if (os_validate((os_vm_address_t)start,(os_vm_size_t)size)==NULL) {
  29         fprintf(stderr,
  30                 "ensure_space: failed to validate %ld bytes at 0x%08lx\n",
  31                 size,
  32                 (unsigned long)start);
  33         exit(1);
  34     }
  35 }
  36
  37 #ifdef HOLES
  38
  39 static os_vm_address_t holes[] = HOLES;
  40
  41 static void
  42 make_holes(void)
  43 {
  44     int i;
  45
  46     for (i = 0; i < sizeof(holes)/sizeof(holes[0]); i++) {
  47         if (os_validate(holes[i], HOLE_SIZE) == NULL) {
  48             fprintf(stderr,
  49                     "make_holes: failed to validate %ld bytes at 0x%08X\n",
  50                     HOLE_SIZE,
  51                     (unsigned long)holes[i]);
  52             exit(1);
  53         }
  54         os_protect(holes[i], HOLE_SIZE, 0);
  55     }
  56 }
  57 #endif
  58
  59 void
  60 validate(void)
  61 {
  62 #ifdef PRINTNOISE
  63     printf("validating memory ...");
  64     fflush(stdout);
  65 #endif
  66
  67     ensure_space( (lispobj *)READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE);
  68     ensure_space( (lispobj *)STATIC_SPACE_START   , STATIC_SPACE_SIZE);
  69 #ifdef LISP_FEATURE_GENCGC
  70     ensure_space( (lispobj *)DYNAMIC_SPACE_START  , DYNAMIC_SPACE_SIZE);
  71 #else
  72     ensure_space( (lispobj *)DYNAMIC_0_SPACE_START  , DYNAMIC_SPACE_SIZE);
  73     ensure_space( (lispobj *)DYNAMIC_1_SPACE_START  , DYNAMIC_SPACE_SIZE);
  74 #endif
  75 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
  76     ensure_space( (lispobj *) ALTERNATE_SIGNAL_STACK_START, SIGSTKSZ);
  77 #endif
  78
  79 #ifdef HOLES
  80     make_holes();
  81 #endif
  82
  83 #ifdef PRINTNOISE
  84     printf(" done.\n");
  85 #endif
  86 }
  87
  88 void protect_control_stack_guard_page(pid_t t_id, int protect_p) {
  89     struct thread *th= find_thread_by_pid(t_id);
  90     os_protect(CONTROL_STACK_GUARD_PAGE(th),
  91                os_vm_page_size,protect_p ?
  92                (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
  93 }
  94