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TOMOYO Linux Cross Reference
Linux/arch/mips/include/asm/ftrace.h

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  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 " %[tmp_dst], 0(%[tmp_src])\n"       \
 26                 "   li %[tmp_err], 0\n"                 \
 27                 "2: .insn\n"                            \
 28                                                         \
 29                 ".section .fixup, \"ax\"\n"             \
 30                 "3: li %[tmp_err], 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                 : [tmp_dst] "=&r" (dst), [tmp_err] "=r" (error)\
 39                 : [tmp_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 " %[tmp_src], 0(%[tmp_dst])\n"\
 48                 "   li %[tmp_err], 0\n"         \
 49                 "2: .insn\n"                    \
 50                                                 \
 51                 ".section .fixup, \"ax\"\n"     \
 52                 "3: li %[tmp_err], 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                 : [tmp_err] "=r" (error)        \
 61                 : [tmp_dst] "r" (dst), [tmp_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 */
 91 

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