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 "sbcl.h"
  20 #include "runtime.h"
  21 #include "os.h"
  22 #include "globals.h"
  23 #include "interr.h"
  24 #include "validate.h"
  25 #include "interr.h"                     /* for declaration of lose */
  26
  27
  28 static void
  29 ensure_space(lispobj *start, uword_t size)
  30 {
  31     if (os_validate((os_vm_address_t)start,(os_vm_size_t)size)==NULL) {
  32         fprintf(stderr,
  33                 "ensure_space: failed to validate %lu bytes at 0x%08lx\n",
  34                 size,
  35                 (uword_t)start);
  36         fprintf(stderr,
  37                 "(hint: Try \"ulimit -a\"; maybe you should increase memory limits.)\n");
  38         exit(1);
  39     }
  40 }
  41
  42 os_vm_address_t undefined_alien_address = 0;
  43
  44 static void
  45 ensure_undefined_alien(void) {
  46     os_vm_address_t start = os_validate(NULL, os_vm_page_size);
  47     if (start) {
  48         os_protect(start, os_vm_page_size, OS_VM_PROT_NONE);
  49         undefined_alien_address = start;
  50     } else {
  51         lose("could not allocate guard page for undefined alien\n");
  52     }
  53 }
  54
  55 /* what a vague name! Something like create_all_spaces() would be more clear */
  56 void
  57 validate(void)
  58 {
  59 #ifdef PRINTNOISE
  60     printf("validating memory ...");
  61     fflush(stdout);
  62 #endif
  63
  64     ensure_space( (lispobj *)READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE);
  65     ensure_space( (lispobj *)STATIC_SPACE_START   , STATIC_SPACE_SIZE);
  66 #ifdef LISP_FEATURE_GENCGC
  67     ensure_space( (lispobj *)DYNAMIC_SPACE_START  , dynamic_space_size);
  68 #else
  69     ensure_space( (lispobj *)DYNAMIC_0_SPACE_START, dynamic_space_size);
  70     ensure_space( (lispobj *)DYNAMIC_1_SPACE_START, dynamic_space_size);
  71 #endif
  72
  73 #ifdef LISP_FEATURE_LINKAGE_TABLE
  74     ensure_space( (lispobj *)LINKAGE_TABLE_SPACE_START,
  75                   LINKAGE_TABLE_SPACE_SIZE);
  76 #endif
  77
  78 #ifdef LISP_FEATURE_OS_PROVIDES_DLOPEN
  79     ensure_undefined_alien();
  80 #endif
  81
  82 #ifdef PRINTNOISE
  83     printf(" done.\n");
  84 #endif
  85 }
  86
  87 static inline void
  88 protect_page(void *page, int protect_p, os_vm_prot_t flags) {
  89     os_protect(page, os_vm_page_size, protect_p ?
  90                flags : OS_VM_PROT_ALL);
  91 }
  92
  93 #define DEF_PROTECT_PAGE(name,page_name,flags)                          \
  94     void                                                                \
  95     protect_##name(int protect_p, struct thread *thread) {              \
  96         if (!thread)                                                    \
  97             thread = arch_os_get_current_thread();                      \
  98         protect_page(page_name(thread), protect_p, flags);              \
  99     }
 100
 101 DEF_PROTECT_PAGE(control_stack_hard_guard_page,
 102                  CONTROL_STACK_HARD_GUARD_PAGE,
 103                  OS_VM_PROT_NONE)
 104 DEF_PROTECT_PAGE(control_stack_guard_page,
 105                  CONTROL_STACK_GUARD_PAGE,
 106                  OS_VM_PROT_READ|OS_VM_PROT_EXECUTE)
 107 DEF_PROTECT_PAGE(control_stack_return_guard_page,
 108                  CONTROL_STACK_RETURN_GUARD_PAGE,
 109                  OS_VM_PROT_READ|OS_VM_PROT_EXECUTE)
 110
 111 DEF_PROTECT_PAGE(binding_stack_hard_guard_page,
 112                  BINDING_STACK_HARD_GUARD_PAGE,
 113                  OS_VM_PROT_NONE)
 114 DEF_PROTECT_PAGE(binding_stack_guard_page,
 115                  BINDING_STACK_GUARD_PAGE,
 116                  OS_VM_PROT_NONE)
 117 DEF_PROTECT_PAGE(binding_stack_return_guard_page,
 118                  BINDING_STACK_RETURN_GUARD_PAGE,
 119                  OS_VM_PROT_NONE)
 120
 121 DEF_PROTECT_PAGE(alien_stack_hard_guard_page,
 122                  ALIEN_STACK_HARD_GUARD_PAGE,
 123                  OS_VM_PROT_NONE)
 124 DEF_PROTECT_PAGE(alien_stack_guard_page,
 125                  ALIEN_STACK_GUARD_PAGE,
 126                  OS_VM_PROT_NONE)
 127 DEF_PROTECT_PAGE(alien_stack_return_guard_page,
 128                  ALIEN_STACK_RETURN_GUARD_PAGE,
 129                  OS_VM_PROT_NONE)