xnu-3789.70.16.tar.gz

[apple/xnu.git] / libkern / gen / OSDebug.cpp

diff --git a/libkern/gen/OSDebug.cpp b/libkern/gen/OSDebug.cpp
index 14ee32621ed62352c30e288120140f5fc84b9c5e..305cfc3cb94d9cd3b224d91b727389bd6f327149 100644 (file)
--- a/libkern/gen/OSDebug.cpp
+++ b/libkern/gen/OSDebug.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2005-2012 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -49,8 +49,11 @@ __BEGIN_DECLS
 extern vm_offset_t min_valid_stack_address(void);
 extern vm_offset_t max_valid_stack_address(void);
 
+// From osfmk/kern/printf.c
+extern boolean_t doprnt_hide_pointers;
+
 // From osfmk/kmod.c
-extern void kmod_dump_log(vm_offset_t *addr, unsigned int cnt);
+extern void kmod_dump_log(vm_offset_t *addr, unsigned int cnt, boolean_t doUnslide);
 
 extern addr64_t kvtophys(vm_offset_t va);
 
@@ -106,9 +109,15 @@ OSReportWithBacktrace(const char *str, ...)
 
     lck_mtx_lock(sOSReportLock);
     {
-        printf("%s\nBacktrace %p %p %p %p %p %p %p\n",
-            buf, bt[2], bt[3], bt[4], bt[5], bt[6], bt[7], bt[8]);
-        kmod_dump_log((vm_offset_t *) &bt[2], cnt - 2);
+        boolean_t old_doprnt_hide_pointers = doprnt_hide_pointers;
+        doprnt_hide_pointers = FALSE;
+        printf("%s\nBacktrace 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", buf, 
+            (unsigned long) VM_KERNEL_UNSLIDE(bt[2]), (unsigned long) VM_KERNEL_UNSLIDE(bt[3]), 
+            (unsigned long) VM_KERNEL_UNSLIDE(bt[4]), (unsigned long) VM_KERNEL_UNSLIDE(bt[5]), 
+            (unsigned long) VM_KERNEL_UNSLIDE(bt[6]), (unsigned long) VM_KERNEL_UNSLIDE(bt[7]), 
+            (unsigned long) VM_KERNEL_UNSLIDE(bt[8]));
+        kmod_dump_log((vm_offset_t *) &bt[2], cnt - 2, TRUE);
+        doprnt_hide_pointers = old_doprnt_hide_pointers;
     }
     lck_mtx_unlock(sOSReportLock);
 }
@@ -116,38 +125,6 @@ OSReportWithBacktrace(const char *str, ...)
 static vm_offset_t minstackaddr = min_valid_stack_address();
 static vm_offset_t maxstackaddr = max_valid_stack_address();
 
-#if __i386__
-#define i386_RETURN_OFFSET 4
-
-static unsigned int
-i386_validate_stackptr(vm_offset_t stackptr)
-{
-       /* Existence and alignment check
-        */
-       if (!stackptr || (stackptr & 0x3))
-               return 0;
-  
-       /* Is a virtual->physical translation present?
-        */
-       if (!kvtophys(stackptr))
-               return 0;
-  
-       /* Check if the return address lies on the same page;
-        * If not, verify that a translation exists.
-        */
-       if (((PAGE_SIZE - (stackptr & PAGE_MASK)) < i386_RETURN_OFFSET) &&
-           !kvtophys(stackptr + i386_RETURN_OFFSET))
-               return 0;
-       return 1;
-}
-
-static unsigned int
-i386_validate_raddr(vm_offset_t raddr)
-{
-       return ((raddr > VM_MIN_KERNEL_AND_KEXT_ADDRESS) &&
-           (raddr < VM_MAX_KERNEL_ADDRESS));
-}
-#endif
 
 #if __x86_64__
 #define x86_64_RETURN_OFFSET 8
@@ -195,50 +172,9 @@ OSPrintBacktrace(void)
 unsigned OSBacktrace(void **bt, unsigned maxAddrs)
 {
     unsigned frame;
+    if (!current_thread()) return 0;
 
-#if __i386__
-#define SANE_i386_FRAME_SIZE (kernel_stack_size >> 1)
-    vm_offset_t stackptr, stackptr_prev, raddr;
-    unsigned frame_index = 0;
-/* Obtain current frame pointer */
-    __asm__ volatile("movl %%ebp, %0" : "=m" (stackptr)); 
-
-    if (!i386_validate_stackptr(stackptr))
-           goto pad;
-
-    raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
-
-    if (!i386_validate_raddr(raddr))
-           goto pad;
-
-    bt[frame_index++] = (void *) raddr;
-
-    for ( ; frame_index < maxAddrs; frame_index++) {
-           stackptr_prev = stackptr;
-           stackptr = *((vm_offset_t *) stackptr_prev);
-
-           if (!i386_validate_stackptr(stackptr))
-                   break;
-       /* Stack grows downwards */
-           if (stackptr < stackptr_prev)
-                   break;
-
-           if ((stackptr - stackptr_prev) > SANE_i386_FRAME_SIZE)
-                   break;
-
-           raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
-
-           if (!i386_validate_raddr(raddr))
-                   break;
-
-           bt[frame_index] = (void *) raddr;
-    }
-pad:
-    frame = frame_index;
-
-    for ( ; frame_index < maxAddrs; frame_index++)
-           bt[frame_index] = (void *) 0;
-#elif __x86_64__
+#if   __x86_64__
 #define SANE_x86_64_FRAME_SIZE (kernel_stack_size >> 1)
     vm_offset_t stackptr, stackptr_prev, raddr;
     unsigned frame_index = 0;