xtensa: add stacktrace support

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / xtensa / kernel / traps.c

diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 923db5c..cf065e1 100644 (file)
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -11,7 +11,7 @@
  *
  * Essentially rewritten for the Xtensa architecture port.
  *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2001 - 2013 Tensilica Inc.
  *
  * Joe Taylor  <joe@tensilica.com, joetylr@yahoo.com>
  * Chris Zankel        <chris@zankel.net>
@@ -32,6 +32,7 @@
 #include <linux/delay.h>
 #include <linux/hardirq.h>
 
+#include <asm/stacktrace.h>
 #include <asm/ptrace.h>
 #include <asm/timex.h>
 #include <asm/uaccess.h>
@@ -402,53 +403,25 @@ void show_regs(struct pt_regs * regs)
                       regs->syscall);
 }
 
-static __always_inline unsigned long *stack_pointer(struct task_struct *task)
+static int show_trace_cb(struct stackframe *frame, void *data)
 {
-       unsigned long *sp;
-
-       if (!task || task == current)
-               __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
-       else
-               sp = (unsigned long *)task->thread.sp;
-
-       return sp;
+       if (kernel_text_address(frame->pc)) {
+               printk(" [<%08lx>] ", frame->pc);
+               print_symbol("%s\n", frame->pc);
+       }
+       return 0;
 }
 
 void show_trace(struct task_struct *task, unsigned long *sp)
 {
-       unsigned long a0, a1, pc;
-       unsigned long sp_start, sp_end;
-
-       if (sp)
-               a1 = (unsigned long)sp;
-       else
-               a1 = (unsigned long)stack_pointer(task);
-
-       sp_start = a1 & ~(THREAD_SIZE-1);
-       sp_end = sp_start + THREAD_SIZE;
+       if (!sp)
+               sp = stack_pointer(task);
 
        printk("Call Trace:");
 #ifdef CONFIG_KALLSYMS
        printk("\n");
 #endif
-       spill_registers();
-
-       while (a1 > sp_start && a1 < sp_end) {
-               sp = (unsigned long*)a1;
-
-               a0 = *(sp - 4);
-               a1 = *(sp - 3);
-
-               if (a1 <= (unsigned long) sp)
-                       break;
-
-               pc = MAKE_PC_FROM_RA(a0, a1);
-
-               if (kernel_text_address(pc)) {
-                       printk(" [<%08lx>] ", pc);
-                       print_symbol("%s\n", pc);
-               }
-       }
+       walk_stackframe(sp, show_trace_cb, NULL);
        printk("\n");
 }