X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/89b3af67bb32e691275bf6fa803d1834b2284115..e2fac8b15b12a7979f72090454d850e612fc5b13:/libkern/gen/OSDebug.cpp?ds=inline

diff --git a/libkern/gen/OSDebug.cpp b/libkern/gen/OSDebug.cpp
index f464ad889..3690714e8 100644
--- a/libkern/gen/OSDebug.cpp
+++ b/libkern/gen/OSDebug.cpp
@@ -39,6 +39,8 @@
 #include <libkern/libkern.h>	// From bsd's libkern directory
 #include <mach/vm_param.h>
 
+#include <sys/kdebug.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);
@@ -48,10 +50,39 @@ 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);
 
+/* Use kernel_debug() to log a backtrace */ 
+void
+trace_backtrace(unsigned int debugid, unsigned int debugid2, int size, int 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) (int)(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
 OSReportWithBacktrace(const char *str, ...)