1 files changed, 58 insertions, 0 deletions

diff --git a/arch/sh/kernel/dumpstack.c b/arch/sh/kernel/dumpstack.c
index 694158b9a50f..7617dc4129ac 100644
--- a/arch/sh/kernel/dumpstack.c
+++ b/arch/sh/kernel/dumpstack.c
@@ -2,13 +2,48 @@
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
  *  Copyright (C) 2009  Matt Fleming
+ *  Copyright (C) 2002 - 2012  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
  */
 #include <linux/kallsyms.h>
 #include <linux/ftrace.h>
 #include <linux/debug_locks.h>
+#include <linux/kdebug.h>
+#include <linux/export.h>
+#include <linux/uaccess.h>
 #include <asm/unwinder.h>
 #include <asm/stacktrace.h>
 
+void dump_mem(const char *str, unsigned long bottom, unsigned long top)
+{
+        unsigned long p;
+        int i;
+
+        printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
+
+        for (p = bottom & ~31; p < top; ) {
+                printk("%04lx: ", p & 0xffff);
+
+                for (i = 0; i < 8; i++, p += 4) {
+                        unsigned int val;
+
+                        if (p < bottom || p >= top)
+                                printk("         ");
+                        else {
+                                if (__get_user(val, (unsigned int __user *)p)) {
+                                        printk("\n");
+                                        return;
+                                }
+                                printk("%08x ", val);
+                        }
+                }
+                printk("\n");
+        }
+}
+
 void printk_address(unsigned long address, int reliable)
 {
         printk(" [<%p>] %s%pS\n", (void *) address,
@@ -106,3 +141,26 @@ void show_trace(struct task_struct *tsk, unsigned long *sp,
 
         debug_show_held_locks(tsk);
 }
+
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+        unsigned long stack;
+
+        if (!tsk)
+                tsk = current;
+        if (tsk == current)
+                sp = (unsigned long *)current_stack_pointer;
+        else
+                sp = (unsigned long *)tsk->thread.sp;
+
+        stack = (unsigned long)sp;
+        dump_mem("Stack: ", stack, THREAD_SIZE +
+                 (unsigned long)task_stack_page(tsk));
+        show_trace(tsk, sp, NULL);
+}
+
+void dump_stack(void)
+{
+        show_stack(NULL, NULL);
+}
+EXPORT_SYMBOL(dump_stack);