1 files changed, 37 insertions, 47 deletions

diff --git a/arch/sh/oprofile/backtrace.c b/arch/sh/oprofile/backtrace.c
index 9499a2914f89..2bc74de23f08 100644
--- a/arch/sh/oprofile/backtrace.c
+++ b/arch/sh/oprofile/backtrace.c
@@ -17,9 +17,43 @@
 #include <linux/sched.h>
 #include <linux/kallsyms.h>
 #include <linux/mm.h>
+#include <asm/unwinder.h>
 #include <asm/ptrace.h>
 #include <asm/uaccess.h>
 #include <asm/sections.h>
+#include <asm/stacktrace.h>
+
+static void backtrace_warning_symbol(void *data, char *msg,
+                                     unsigned long symbol)
+{
+        /* Ignore warnings */
+}
+
+static void backtrace_warning(void *data, char *msg)
+{
+        /* Ignore warnings */
+}
+
+static int backtrace_stack(void *data, char *name)
+{
+        /* Yes, we want all stacks */
+        return 0;
+}
+
+static void backtrace_address(void *data, unsigned long addr, int reliable)
+{
+        unsigned int *depth = data;
+
+        if ((*depth)--)
+                oprofile_add_trace(addr);
+}
+
+static struct stacktrace_ops backtrace_ops = {
+        .warning = backtrace_warning,
+        .warning_symbol = backtrace_warning_symbol,
+        .stack = backtrace_stack,
+        .address = backtrace_address,
+};
 
 /* Limit to stop backtracing too far. */
 static int backtrace_limit = 20;
@@ -47,50 +81,6 @@ user_backtrace(unsigned long *stackaddr, struct pt_regs *regs)
         return stackaddr;
 }
 
-/*
- * |             | /\ Higher addresses
- * |             |
- * --------------- stack base (address of current_thread_info)
- * | thread info |
- * .             .
- * |    stack    |
- * --------------- saved regs->regs[15] value if valid
- * .             .
- * --------------- struct pt_regs stored on stack (struct pt_regs *)
- * |             |
- * .             .
- * |             |
- * --------------- ???
- * |             |
- * |             | \/ Lower addresses
- *
- * Thus, &pt_regs <-> stack base restricts the valid(ish) fp values
- */
-static int valid_kernel_stack(unsigned long *stackaddr, struct pt_regs *regs)
-{
-        unsigned long stack = (unsigned long)regs;
-        unsigned long stack_base = (stack & ~(THREAD_SIZE - 1)) + THREAD_SIZE;
-
-        return ((unsigned long)stackaddr > stack) && ((unsigned long)stackaddr < stack_base);
-}
-
-static unsigned long *
-kernel_backtrace(unsigned long *stackaddr, struct pt_regs *regs)
-{
-        unsigned long addr;
-
-        /*
-         * If not a valid kernel address, keep going till we find one
-         * or the SP stops being a valid address.
-         */
-        do {
-                addr = *stackaddr++;
-                oprofile_add_trace(addr);
-        } while (valid_kernel_stack(stackaddr, regs));
-
-        return stackaddr;
-}
-
 void sh_backtrace(struct pt_regs * const regs, unsigned int depth)
 {
         unsigned long *stackaddr;
@@ -103,9 +93,9 @@ void sh_backtrace(struct pt_regs * const regs, unsigned int depth)
 
         stackaddr = (unsigned long *)regs->regs[15];
         if (!user_mode(regs)) {
-                while (depth-- && valid_kernel_stack(stackaddr, regs))
-                        stackaddr = kernel_backtrace(stackaddr, regs);
-
+                if (depth)
+                        unwind_stack(NULL, regs, stackaddr,
+                                     &backtrace_ops, &depth);
                 return;
         }