[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, 15 insertions, 4 deletions

diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 96da847023f3..d9b8d46707d1 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -2091,9 +2091,8 @@ static void user_instruction_dump(unsigned int __user *pc)
 
 void show_stack(struct task_struct *tsk, unsigned long *_ksp)
 {
-        unsigned long pc, fp, thread_base, ksp;
+        unsigned long fp, thread_base, ksp;
         struct thread_info *tp;
-        struct reg_window *rw;
         int count = 0;
 
         ksp = (unsigned long) _ksp;
@@ -2117,15 +2116,27 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
         printk("\n");
 #endif
         do {
+                struct reg_window *rw;
+                struct pt_regs *regs;
+                unsigned long pc;
+
                 /* Bogus frame pointer? */
                 if (fp < (thread_base + sizeof(struct thread_info)) ||
                     fp >= (thread_base + THREAD_SIZE))
                         break;
                 rw = (struct reg_window *)fp;
-                pc = rw->ins[7];
+                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;
+                }
+
                 printk(" [%016lx] ", pc);
                 print_symbol("%s\n", pc);
-                fp = rw->ins[6] + STACK_BIAS;
         } while (++count < 16);
 #ifndef CONFIG_KALLSYMS
         printk("\n");