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, unsigned long 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 %ld bytes at 0x%08lx\n",
  34                 size,
  35                 (unsigned long)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 void
  56 validate(void)
  57 {
  58 #ifdef PRINTNOISE
  59     printf("validating memory ...");
  60     fflush(stdout);
  61 #endif
  62
  63     ensure_space( (lispobj *)READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE);
  64     ensure_space( (lispobj *)STATIC_SPACE_START   , STATIC_SPACE_SIZE);
  65 #ifdef LISP_FEATURE_GENCGC
  66     ensure_space( (lispobj *)DYNAMIC_SPACE_START  , dynamic_space_size);
  67 #else
  68     ensure_space( (lispobj *)DYNAMIC_0_SPACE_START, dynamic_space_size);
  69     ensure_space( (lispobj *)DYNAMIC_1_SPACE_START, dynamic_space_size);
  70 #endif
  71
  72 #ifdef LISP_FEATURE_LINKAGE_TABLE
  73     ensure_space( (lispobj *)LINKAGE_TABLE_SPACE_START, LINKAGE_TABLE_SPACE_SIZE);
  74 #endif
  75
  76 #ifdef LISP_FEATURE_OS_PROVIDES_DLOPEN
  77     ensure_undefined_alien();
  78 #endif
  79
  80 #ifdef PRINTNOISE
  81     printf(" done.\n");
  82 #endif
  83 }
  84
  85 void
  86 protect_control_stack_guard_page(int protect_p) {
  87     struct thread *th = arch_os_get_current_thread();
  88     os_protect(CONTROL_STACK_GUARD_PAGE(th),
  89                os_vm_page_size,protect_p ?
  90                (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
  91 }
  92
  93 void
  94 protect_control_stack_return_guard_page(int protect_p) {
  95     struct thread *th = arch_os_get_current_thread();
  96     os_protect(CONTROL_STACK_RETURN_GUARD_PAGE(th),
  97                os_vm_page_size,protect_p ?
  98                (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
  99 }
 100
 101 /* these OOAO violations are here because with mach exception handlers
 102  * we need to protect the stack guard pages from the mach exception
 103  * handlers which run on a different thread, so we take a thread
 104  * argument here. Too bad we don't have keywords args in C. */
 105 void
 106 protect_control_stack_guard_page_thread(int protect_p, struct thread *th) {
 107     os_protect(CONTROL_STACK_GUARD_PAGE(th),
 108                os_vm_page_size,protect_p ?
 109                (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
 110 }
 111
 112 void
 113 protect_control_stack_return_guard_page_thread(int protect_p, struct thread* th) {
 114     os_protect(CONTROL_STACK_RETURN_GUARD_PAGE(th),
 115                os_vm_page_size,protect_p ?
 116                (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
 117 }