m68knommu: m68knommu: add old stack trace method

The old method is used when frame pointers are not available.
Also fix formating with CONFIG_KALLSYMS=n which eliminates \n.

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

diff --git a/arch/m68knommu/kernel/traps.c b/arch/m68knommu/kernel/traps.c
index ec9aea652e79d0665adcb36fe5e9cd49d9625a51..46f8f9d0c4089085c2c3888e0c63afa2cbbb0e09 100644 (file)
--- a/arch/m68knommu/kernel/traps.c
+++ b/arch/m68knommu/kernel/traps.c
@@ -103,12 +103,28 @@ asmlinkage void buserr_c(struct frame *fp)
        force_sig(SIGSEGV, current);
 }
 
+static void print_this_address(unsigned long addr, int i)
+{
+#ifdef CONFIG_KALLSYMS
+       printk(KERN_EMERG " [%08lx] ", addr);
+       print_symbol(KERN_CONT "%s\n", addr);
+#else
+       if (i % 5)
+               printk(KERN_CONT " [%08lx] ", addr);
+       else
+               printk(KERN_CONT "\n" KERN_EMERG " [%08lx] ", addr);
+       i++;
+#endif
+}
+
 int kstack_depth_to_print = 48;
 
 static void __show_stack(struct task_struct *task, unsigned long *stack)
 {
        unsigned long *endstack, addr;
+#ifdef CONFIG_FRAME_POINTER
        unsigned long *last_stack;
+#endif
        int i;
 
        if (!stack)
@@ -126,6 +142,7 @@ static void __show_stack(struct task_struct *task, unsigned long *stack)
                printk(" %08lx", *(stack + i));
        }
        printk("\n");
+       i = 0;
 
 #ifdef CONFIG_FRAME_POINTER
        printk(KERN_EMERG "Call Trace:\n");
@@ -134,15 +151,30 @@ static void __show_stack(struct task_struct *task, unsigned long *stack)
        while (stack <= endstack && stack > last_stack) {
 
                addr = *(stack + 1);
-               printk(KERN_EMERG " [%08lx] ", addr);
-               print_symbol(KERN_CONT "%s\n", addr);
+               print_this_address(addr, i);
+               i++;
 
                last_stack = stack;
                stack = (unsigned long *)*stack;
        }
        printk("\n");
 #else
-       printk(KERN_EMERG "CONFIG_FRAME_POINTER disabled, no symbolic call trace\n");
+       printk(KERN_EMERG "Call Trace with CONFIG_FRAME_POINTER disabled:\n");
+       while (stack <= endstack) {
+               addr = *stack++;
+               /*
+                * If the address is either in the text segment of the kernel,
+                * or in a region which is occupied by a module then it *may*
+                * be the address of a calling routine; if so, print it so that
+                * someone tracing down the cause of the crash will be able to
+                * figure out the call path that was taken.
+                */
+               if (__kernel_text_address(addr)) {
+                       print_this_address(addr, i);
+                       i++;
+               }
+       }
+       printk(KERN_CONT "\n");
 #endif
 }