X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/89b3af67bb32e691275bf6fa803d1834b2284115..6d2010ae8f7a6078e10b361c6962983bab233e0f:/libkern/gen/OSDebug.cpp?ds=sidebyside

diff --git a/libkern/gen/OSDebug.cpp b/libkern/gen/OSDebug.cpp
index f464ad889..3e67cfff8 100644
--- a/libkern/gen/OSDebug.cpp
+++ b/libkern/gen/OSDebug.cpp
@@ -28,17 +28,22 @@
 
 // NOTE:  This file is only c++ so I can get static initialisers going
 #include <libkern/OSDebug.h>
+#include <IOKit/IOLib.h>
 
 #include <sys/cdefs.h>
 
 #include <stdarg.h>
 #include <mach/mach_types.h>
 #include <mach/kmod.h>
-#include <kern/lock.h>
+#include <kern/locks.h>
 
 #include <libkern/libkern.h>	// From bsd's libkern directory
 #include <mach/vm_param.h>
 
+#include <sys/kdebug.h>
+#include <kern/thread.h>
+
+extern int etext;
 __BEGIN_DECLS
 // From osmfk/kern/thread.h but considered to be private
 extern vm_offset_t min_valid_stack_address(void);
@@ -48,9 +53,40 @@ extern vm_offset_t max_valid_stack_address(void);
 extern void kmod_dump_log(vm_offset_t *addr, unsigned int cnt);
 
 extern addr64_t kvtophys(vm_offset_t va);
+
 __END_DECLS
 
-static mutex_t *sOSReportLock = mutex_alloc(0);
+extern lck_grp_t *IOLockGroup;
+
+static lck_mtx_t *sOSReportLock = lck_mtx_alloc_init(IOLockGroup, LCK_ATTR_NULL);
+
+/* Use kernel_debug() to log a backtrace */ 
+void
+trace_backtrace(uint32_t debugid, uint32_t debugid2, uintptr_t size, uintptr_t data) {
+	void *bt[16];
+	const unsigned cnt = sizeof(bt) / sizeof(bt[0]);
+  	unsigned i;
+	int found = 0;
+
+	OSBacktrace(bt, cnt);	
+  
+	/* find first non-kernel frame */
+  	for (i = 3; i < cnt && bt[i]; i++) {
+ 		if (bt[i] > (void*)&etext) {
+			found = 1;
+  			break;
+		}
+	}
+	/* 
+	 * if there are non-kernel frames, only log these
+	 * otherwise, log everything but the first two
+	 */
+	if (!found) i=2;
+
+#define safe_bt(a) (uintptr_t)(a<cnt ? bt[a] : 0)
+	kernel_debug(debugid, data, size, safe_bt(i), safe_bt(i+1), 0);
+	kernel_debug(debugid2, safe_bt(i+2), safe_bt(i+3), safe_bt(i+4), safe_bt(i+5), 0);
+}
 
 /* Report a message with a 4 entry backtrace - very slow */
 void
@@ -68,13 +104,13 @@ OSReportWithBacktrace(const char *str, ...)
     vsnprintf(buf, sizeof(buf), str, listp);
     va_end(listp);
 
-    mutex_lock(sOSReportLock);
+    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);
+        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);
     }
-    mutex_unlock(sOSReportLock);
+    lck_mtx_unlock(sOSReportLock);
 }
 
 static vm_offset_t minstackaddr = min_valid_stack_address();
@@ -108,46 +144,60 @@ i386_validate_stackptr(vm_offset_t stackptr)
 static unsigned int
 i386_validate_raddr(vm_offset_t raddr)
 {
-	return ((raddr > VM_MIN_KERNEL_ADDRESS) &&
+	return ((raddr > VM_MIN_KERNEL_AND_KEXT_ADDRESS) &&
 	    (raddr < VM_MAX_KERNEL_ADDRESS));
 }
 #endif
 
+#if __x86_64__
+#define x86_64_RETURN_OFFSET 8
+static unsigned int
+x86_64_validate_raddr(vm_offset_t raddr)
+{
+	return ((raddr > VM_MIN_KERNEL_AND_KEXT_ADDRESS) &&
+	    (raddr < VM_MAX_KERNEL_ADDRESS));
+}
+static unsigned int
+x86_64_validate_stackptr(vm_offset_t stackptr)
+{
+	/* Existence and alignment check
+	 */
+	if (!stackptr || (stackptr & 0x7) || !x86_64_validate_raddr(stackptr))
+		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)) < x86_64_RETURN_OFFSET) &&
+	    !kvtophys(stackptr + x86_64_RETURN_OFFSET))
+		return 0;
+	return 1;
+}
+#endif
+
+void
+OSPrintBacktrace(void)
+{
+	void * btbuf[20];
+	int tmp = OSBacktrace(btbuf, 20);
+	int i;
+	for(i=0;i<tmp;i++)
+	{
+		kprintf("bt[%.2d] = %p\n", i, btbuf[i]);
+	}
+}
+
 unsigned OSBacktrace(void **bt, unsigned maxAddrs)
 {
     unsigned frame;
 
-#if __ppc__
-    vm_offset_t stackptr, stackptr_prev;
-    const vm_offset_t * const mem = (vm_offset_t *) 0;
-    unsigned i = 0;
-
-    __asm__ volatile("mflr %0" : "=r" (stackptr)); 
-    bt[i++] = (void *) stackptr;
-
-    __asm__ volatile("mr %0,r1" : "=r" (stackptr)); 
-    for ( ; i < maxAddrs; i++) {
-	// Validate we have a reasonable stackptr
-	if ( !(minstackaddr <= stackptr && stackptr < maxstackaddr)
-	|| (stackptr & 3))
-	    break;
-
-	stackptr_prev = stackptr;
-	stackptr = mem[stackptr_prev >> 2];
-	if ((stackptr_prev ^ stackptr) > 8 * 1024)	// Sanity check
-	    break;
-
-	vm_offset_t addr = mem[(stackptr >> 2) + 2]; 
-	if ((addr & 3) || (addr < 0x8000))	// More sanity checks
-	    break;
-	bt[i] = (void *) addr;
-    }
-    frame = i;
-
-    for ( ; i < maxAddrs; i++)
-	    bt[i] = (void *) 0;
-#elif __i386__
-#define SANE_i386_FRAME_SIZE 8*1024
+#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 */
@@ -173,7 +223,7 @@ unsigned OSBacktrace(void **bt, unsigned maxAddrs)
 	    if (stackptr < stackptr_prev)
 		    break;
 
-	    if ((stackptr_prev ^ stackptr) > SANE_i386_FRAME_SIZE)
+	    if ((stackptr - stackptr_prev) > SANE_i386_FRAME_SIZE)
 		    break;
 
 	    raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
@@ -186,6 +236,49 @@ unsigned OSBacktrace(void **bt, unsigned maxAddrs)
 pad:
     frame = frame_index;
 
+    for ( ; frame_index < maxAddrs; frame_index++)
+	    bt[frame_index] = (void *) 0;
+#elif __x86_64__
+#define SANE_x86_64_FRAME_SIZE (kernel_stack_size >> 1)
+    vm_offset_t stackptr, stackptr_prev, raddr;
+    unsigned frame_index = 0;
+/* Obtain current frame pointer */
+
+    __asm__ volatile("movq %%rbp, %0" : "=m" (stackptr)); 
+
+    if (!x86_64_validate_stackptr(stackptr))
+	    goto pad;
+
+    raddr = *((vm_offset_t *) (stackptr + x86_64_RETURN_OFFSET));
+
+    if (!x86_64_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 (!x86_64_validate_stackptr(stackptr))
+		    break;
+	/* Stack grows downwards */
+	    if (stackptr < stackptr_prev)
+		    break;
+
+	    if ((stackptr - stackptr_prev) > SANE_x86_64_FRAME_SIZE)
+		    break;
+
+	    raddr = *((vm_offset_t *) (stackptr + x86_64_RETURN_OFFSET));
+
+	    if (!x86_64_validate_raddr(raddr))
+		    break;
+
+	    bt[frame_index] = (void *) raddr;
+    }
+pad:
+    frame = frame_index;
+
     for ( ; frame_index < maxAddrs; frame_index++)
 	    bt[frame_index] = (void *) 0;
 #else
@@ -193,3 +286,4 @@ pad:
 #endif
     return frame;
 }
+