arch/mips/include/asm/ftrace.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive for
   4  * more details.
   5  *
   6  * Copyright (C) 2009 DSLab, Lanzhou University, China
   7  * Author: Wu Zhangjin <wuzhangjin@gmail.com>
   8  */
   9
  10 #ifndef _ASM_MIPS_FTRACE_H
  11 #define _ASM_MIPS_FTRACE_H
  12
  13 #ifdef CONFIG_FUNCTION_TRACER
  14
  15 #define MCOUNT_ADDR ((unsigned long)(_mcount))
  16 #define MCOUNT_INSN_SIZE 4              /* sizeof mcount call */
  17
  18 #ifndef __ASSEMBLY__
  19 extern void _mcount(void);
  20 #define mcount _mcount
  21
  22 #define safe_load(load, src, dst, error)                \
  23 do {                                                    \
  24         asm volatile (                                  \
  25                 "1: " load " %[" STR(dst) "], 0(%[" STR(src) "])\n"\
  26                 "   li %[" STR(error) "], 0\n"          \
  27                 "2:\n"                                  \
  28                                                         \
  29                 ".section .fixup, \"ax\"\n"             \
  30                 "3: li %[" STR(error) "], 1\n"          \
  31                 "   j 2b\n"                             \
  32                 ".previous\n"                           \
  33                                                         \
  34                 ".section\t__ex_table,\"a\"\n\t"        \
  35                 STR(PTR) "\t1b, 3b\n\t"                 \
  36                 ".previous\n"                           \
  37                                                         \
  38                 : [dst] "=&r" (dst), [error] "=r" (error)\
  39                 : [src] "r" (src)                       \
  40                 : "memory"                              \
  41         );                                              \
  42 } while (0)
  43
  44 #define safe_store(store, src, dst, error)      \
  45 do {                                            \
  46         asm volatile (                          \
  47                 "1: " store " %[" STR(src) "], 0(%[" STR(dst) "])\n"\
  48                 "   li %[" STR(error) "], 0\n"  \
  49                 "2:\n"                          \
  50                                                 \
  51                 ".section .fixup, \"ax\"\n"     \
  52                 "3: li %[" STR(error) "], 1\n"  \
  53                 "   j 2b\n"                     \
  54                 ".previous\n"                   \
  55                                                 \
  56                 ".section\t__ex_table,\"a\"\n\t"\
  57                 STR(PTR) "\t1b, 3b\n\t"         \
  58                 ".previous\n"                   \
  59                                                 \
  60                 : [error] "=r" (error)          \
  61                 : [dst] "r" (dst), [src] "r" (src)\
  62                 : "memory"                      \
  63         );                                      \
  64 } while (0)
  65
  66 #define safe_load_code(dst, src, error) \
  67         safe_load(STR(lw), src, dst, error)
  68 #define safe_store_code(src, dst, error) \
  69         safe_store(STR(sw), src, dst, error)
  70
  71 #define safe_load_stack(dst, src, error) \
  72         safe_load(STR(PTR_L), src, dst, error)
  73
  74 #define safe_store_stack(src, dst, error) \
  75         safe_store(STR(PTR_S), src, dst, error)
  76
  77
  78 #ifdef CONFIG_DYNAMIC_FTRACE
  79 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  80 {
  81         return addr;
  82 }
  83
  84 struct dyn_arch_ftrace {
  85 };
  86
  87 #endif /*  CONFIG_DYNAMIC_FTRACE */
  88 #endif /* __ASSEMBLY__ */
  89 #endif /* CONFIG_FUNCTION_TRACER */
  90 #endif /* _ASM_MIPS_FTRACE_H */