1 files changed, 41 insertions, 0 deletions
diff --git a/core/backtrace.c b/core/backtrace.c
new file mode 100644
index 00000000..3439db01
--- /dev/null
+++ b/core/backtrace.c
@@ -0,0 +1,41 @@
+/* Copyright 2013-2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include <skiboot.h>
+#include <processor.h>
+#include <cpu.h>
+
+void backtrace(void)
+{
+	unsigned int pir = mfspr(SPR_PIR);
+	unsigned long *sp;
+	unsigned long *bottom, *top;
+
+	/* Check if there's a __builtin_something instead */
+	asm("mr %0,1" : "=r" (sp));
+
+	bottom = cpu_stack_bottom(pir);
+	top = cpu_stack_top(pir);
+
+	/* XXX Handle SMP */
+	fprintf(stderr, "CPU %08x Backtrace:\n", pir);
+	while(sp > bottom && sp < top) {
+		fprintf(stderr, " S: %016lx R: %016lx\n",
+			(unsigned long)sp, sp[2]);
+		sp = (unsigned long *)sp[0];
+	}
+}