1 files changed, 29 insertions, 15 deletions

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 79abc4ddc0cf..57eb0f6f6005 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -27,6 +27,7 @@
 #include <asm/system.h>
 #include <asm/unistd.h>
 #include <asm/traps.h>
+#include <asm/unwind.h>
 
 #include "ptrace.h"
 #include "signal.h"
@@ -61,6 +62,7 @@ void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long
                 dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
 }
 
+#ifndef CONFIG_ARM_UNWIND
 /*
  * Stack pointers should always be within the kernels view of
  * physical memory.  If it is not there, then we can't dump
@@ -74,6 +76,7 @@ static int verify_stack(unsigned long sp)
 
         return 0;
 }
+#endif
 
 /*
  * Dump out the contents of some memory nicely...
@@ -150,13 +153,33 @@ static void dump_instr(struct pt_regs *regs)
         set_fs(fs);
 }
 
+#ifdef CONFIG_ARM_UNWIND
+static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+{
+        unwind_backtrace(regs, tsk);
+}
+#else
 static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 {
-        unsigned int fp;
+        unsigned int fp, mode;
         int ok = 1;
 
         printk("Backtrace: ");
-        fp = regs->ARM_fp;
+
+        if (!tsk)
+                tsk = current;
+
+        if (regs) {
+                fp = regs->ARM_fp;
+                mode = processor_mode(regs);
+        } else if (tsk != current) {
+                fp = thread_saved_fp(tsk);
+                mode = 0x10;
+        } else {
+                asm("mov %0, fp" : "=r" (fp) : : "cc");
+                mode = 0x10;
+        }
+
         if (!fp) {
                 printk("no frame pointer");
                 ok = 0;
@@ -168,29 +191,20 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
         printk("\n");
 
         if (ok)
-                c_backtrace(fp, processor_mode(regs));
+                c_backtrace(fp, mode);
 }
+#endif
 
 void dump_stack(void)
 {
-        __backtrace();
+        dump_backtrace(NULL, NULL);
 }
 
 EXPORT_SYMBOL(dump_stack);
 
 void show_stack(struct task_struct *tsk, unsigned long *sp)
 {
-        unsigned long fp;
-
-        if (!tsk)
-                tsk = current;
-
-        if (tsk != current)
-                fp = thread_saved_fp(tsk);
-        else
-                asm("mov %0, fp" : "=r" (fp) : : "cc");
-
-        c_backtrace(fp, 0x10);
+        dump_backtrace(NULL, tsk);
         barrier();
 }