1 files changed, 90 insertions, 1 deletions

diff --git a/arch/mips/include/asm/ftrace.h b/arch/mips/include/asm/ftrace.h
index 40a8c178f10d..3986cd8704f3 100644
--- a/arch/mips/include/asm/ftrace.h
+++ b/arch/mips/include/asm/ftrace.h
@@ -1 +1,90 @@
-/* empty */
+/*
+ * 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.
+ *
+ * Copyright (C) 2009 DSLab, Lanzhou University, China
+ * Author: Wu Zhangjin <wuzj@lemote.com>
+ */
+
+#ifndef _ASM_MIPS_FTRACE_H
+#define _ASM_MIPS_FTRACE_H
+
+#ifdef CONFIG_FUNCTION_TRACER
+
+#define MCOUNT_ADDR ((unsigned long)(_mcount))
+#define MCOUNT_INSN_SIZE 4              /* sizeof mcount call */
+
+#ifndef __ASSEMBLY__
+extern void _mcount(void);
+#define mcount _mcount
+
+#define safe_load(load, src, dst, error)                \
+do {                                                    \
+        asm volatile (                                  \
+                "1: " load " %[" STR(dst) "], 0(%[" STR(src) "])\n"\
+                "   li %[" STR(error) "], 0\n"          \
+                "2:\n"                                  \
+                                                        \
+                ".section .fixup, \"ax\"\n"             \
+                "3: li %[" STR(error) "], 1\n"          \
+                "   j 2b\n"                             \
+                ".previous\n"                           \
+                                                        \
+                ".section\t__ex_table,\"a\"\n\t"        \
+                STR(PTR) "\t1b, 3b\n\t"                 \
+                ".previous\n"                           \
+                                                        \
+                : [dst] "=&r" (dst), [error] "=r" (error)\
+                : [src] "r" (src)                       \
+                : "memory"                              \
+        );                                              \
+} while (0)
+
+#define safe_store(store, src, dst, error)      \
+do {                                            \
+        asm volatile (                          \
+                "1: " store " %[" STR(src) "], 0(%[" STR(dst) "])\n"\
+                "   li %[" STR(error) "], 0\n"  \
+                "2:\n"                          \
+                                                \
+                ".section .fixup, \"ax\"\n"     \
+                "3: li %[" STR(error) "], 1\n"  \
+                "   j 2b\n"                     \
+                ".previous\n"                   \
+                                                \
+                ".section\t__ex_table,\"a\"\n\t"\
+                STR(PTR) "\t1b, 3b\n\t"         \
+                ".previous\n"                   \
+                                                \
+                : [error] "=r" (error)          \
+                : [dst] "r" (dst), [src] "r" (src)\
+                : "memory"                      \
+        );                                      \
+} while (0)
+
+#define safe_load_code(dst, src, error) \
+        safe_load(STR(lw), src, dst, error)
+#define safe_store_code(src, dst, error) \
+        safe_store(STR(sw), src, dst, error)
+
+#define safe_load_stack(dst, src, error) \
+        safe_load(STR(PTR_L), src, dst, error)
+
+#define safe_store_stack(src, dst, error) \
+        safe_store(STR(PTR_S), src, dst, error)
+
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+static inline unsigned long ftrace_call_adjust(unsigned long addr)
+{
+        return addr;
+}
+
+struct dyn_arch_ftrace {
+};
+
+#endif /*  CONFIG_DYNAMIC_FTRACE */
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_FUNCTION_TRACER */
+#endif /* _ASM_MIPS_FTRACE_H */