[SPARC64]: Detect trap frames in stack backtraces.

Now that we have a magic cookie in the pt_regs, we can
properly detect trap frames in stack bactraces.

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

1 files changed, 13 insertions, 3 deletions

diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
index 84d39e873e88..01b52f561af4 100644
--- a/arch/sparc64/kernel/stacktrace.c
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -20,6 +20,8 @@ void save_stack_trace(struct stack_trace *trace)
         thread_base = (unsigned long) tp;
         do {
                 struct reg_window *rw;
+                struct pt_regs *regs;
+                unsigned long pc;
 
                 /* Bogus frame pointer? */
                 if (fp < (thread_base + sizeof(struct thread_info)) ||
@@ -27,11 +29,19 @@ void save_stack_trace(struct stack_trace *trace)
                         break;
 
                 rw = (struct reg_window *) fp;
+                regs = (struct pt_regs *) (rw + 1);
+
+                if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
+                        pc = regs->tpc;
+                        fp = regs->u_regs[UREG_I6] + STACK_BIAS;
+                } else {
+                        pc = rw->ins[7];
+                        fp = rw->ins[6] + STACK_BIAS;
+                }
+
                 if (trace->skip > 0)
                         trace->skip--;
                 else
-                        trace->entries[trace->nr_entries++] = rw->ins[7];
-
-                fp = rw->ins[6] + STACK_BIAS;
+                        trace->entries[trace->nr_entries++] = pc;
         } while (trace->nr_entries < trace->max_entries);
 }