[SPARC64]: Add irqtrace/stacktrace/lockdep support.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
new file mode 100644
index 000000000000..c4d15f2762b9
--- /dev/null
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -0,0 +1,41 @@
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/thread_info.h>
+#include <asm/ptrace.h>
+
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
+{
+        unsigned long ksp, fp, thread_base;
+        struct thread_info *tp;
+
+        if (!task)
+                task = current;
+        tp = task_thread_info(task);
+        if (task == current) {
+                flushw_all();
+                __asm__ __volatile__(
+                        "mov    %%fp, %0"
+                        : "=r" (ksp)
+                );
+        } else
+                ksp = tp->ksp;
+
+        fp = ksp + STACK_BIAS;
+        thread_base = (unsigned long) tp;
+        do {
+                struct reg_window *rw;
+
+                /* Bogus frame pointer? */
+                if (fp < (thread_base + sizeof(struct thread_info)) ||
+                    fp >= (thread_base + THREAD_SIZE))
+                        break;
+
+                rw = (struct reg_window *) fp;
+                if (trace->skip > 0)
+                        trace->skip--;
+                else
+                        trace->entries[trace->nr_entries++] = rw->ins[7];
+
+                fp = rw->ins[6] + STACK_BIAS;
+        } while (trace->nr_entries < trace->max_entries);
+}