X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fvalidate.c;h=e11b0bf0ddb21d33c2eead11192e6e7b79c91fff;hb=be7adb92bf0012ab07adac2943e73772dfad7911;hp=a7e9a3dfd3fff8fc1b4029eb374d0a2e4f71fe54;hpb=75b52379bdc2269961af6a1308eca63610f38ac3;p=sbcl.git

diff --git a/src/runtime/validate.c b/src/runtime/validate.c
index a7e9a3d..e11b0bf 100644
--- a/src/runtime/validate.c
+++ b/src/runtime/validate.c
@@ -20,19 +20,33 @@
 #include "runtime.h"
 #include "os.h"
 #include "globals.h"
+#include "interr.h"
 #include "validate.h"
 
 static void
 ensure_space(lispobj *start, unsigned long size)
 {
     if (os_validate((os_vm_address_t)start,(os_vm_size_t)size)==NULL) {
-	fprintf(stderr,
-		"ensure_space: failed to validate %ld bytes at 0x%08lx\n",
-		size,
-		(unsigned long)start);
-	fprintf(stderr,
-		"(hint: Try \"ulimit -a\"; maybe you should increase memory limits.)\n");
-	exit(1);
+        fprintf(stderr,
+                "ensure_space: failed to validate %ld bytes at 0x%08lx\n",
+                size,
+                (unsigned long)start);
+        fprintf(stderr,
+                "(hint: Try \"ulimit -a\"; maybe you should increase memory limits.)\n");
+        exit(1);
+    }
+}
+
+os_vm_address_t undefined_alien_address = 0;
+
+static void
+ensure_undefined_alien(void) {
+    os_vm_address_t start = os_validate(NULL, os_vm_page_size);
+    if (start) {
+        os_protect(start, os_vm_page_size, OS_VM_PROT_NONE);
+        undefined_alien_address = start;
+    } else {
+        lose("could not allocate guard page for undefined alien");
     }
 }
 
@@ -43,7 +57,7 @@ validate(void)
     printf("validating memory ...");
     fflush(stdout);
 #endif
-    
+
     ensure_space( (lispobj *)READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE);
     ensure_space( (lispobj *)STATIC_SPACE_START   , STATIC_SPACE_SIZE);
 #ifdef LISP_FEATURE_GENCGC
@@ -56,16 +70,26 @@ validate(void)
 #ifdef LISP_FEATURE_LINKAGE_TABLE
     ensure_space( (lispobj *)LINKAGE_TABLE_SPACE_START, LINKAGE_TABLE_SPACE_SIZE);
 #endif
- 
+
+#ifdef LISP_FEATURE_OS_PROVIDES_DLOPEN
+    ensure_undefined_alien();
+#endif
+
 #ifdef PRINTNOISE
     printf(" done.\n");
 #endif
 }
 
-void protect_control_stack_guard_page(pid_t t_id, int protect_p) {
-    struct thread *th = find_thread_by_pid(t_id);
+void
+protect_control_stack_guard_page(struct thread *th, int protect_p) {
     os_protect(CONTROL_STACK_GUARD_PAGE(th),
-	       os_vm_page_size,protect_p ?
-	       (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
+               os_vm_page_size,protect_p ?
+               (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
 }
 
+void
+protect_control_stack_return_guard_page(struct thread *th, int protect_p) {
+    os_protect(CONTROL_STACK_RETURN_GUARD_PAGE(th),
+               os_vm_page_size,protect_p ?
+               (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
+}