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-rw-r--r--arch/powerpc/kernel/stacktrace.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
new file mode 100644
index 000000000..ea43a347a
--- /dev/null
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -0,0 +1,63 @@
+/*
+ * Stack trace utility
+ *
+ * Copyright 2008 Christoph Hellwig, IBM Corp.
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ */
+static void save_context_stack(struct stack_trace *trace, unsigned long sp,
+ struct task_struct *tsk, int savesched)
+{
+ for (;;) {
+ unsigned long *stack = (unsigned long *) sp;
+ unsigned long newsp, ip;
+
+ if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD))
+ return;
+
+ newsp = stack[0];
+ ip = stack[STACK_FRAME_LR_SAVE];
+
+ if (savesched || !in_sched_functions(ip)) {
+ if (!trace->skip)
+ trace->entries[trace->nr_entries++] = ip;
+ else
+ trace->skip--;
+ }
+
+ if (trace->nr_entries >= trace->max_entries)
+ return;
+
+ sp = newsp;
+ }
+}
+
+void save_stack_trace(struct stack_trace *trace)
+{
+ unsigned long sp;
+
+ sp = current_stack_pointer();
+
+ save_context_stack(trace, sp, current, 1);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+ save_context_stack(trace, tsk->thread.ksp, tsk, 0);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);