arch/arm/include/asm/ftrace.h

   1 #ifndef _ASM_ARM_FTRACE
   2 #define _ASM_ARM_FTRACE
   3
   4 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
   5 #define ARCH_SUPPORTS_FTRACE_OPS 1
   6 #endif
   7
   8 #ifdef CONFIG_FUNCTION_TRACER
   9 #define MCOUNT_ADDR             ((unsigned long)(__gnu_mcount_nc))
  10 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
  11
  12 #ifndef __ASSEMBLY__
  13 extern void mcount(void);
  14 extern void __gnu_mcount_nc(void);
  15
  16 #ifdef CONFIG_DYNAMIC_FTRACE
  17 struct dyn_arch_ftrace {
  18 #ifdef CONFIG_OLD_MCOUNT
  19         bool    old_mcount;
  20 #endif
  21 };
  22
  23 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  24 {
  25         /* With Thumb-2, the recorded addresses have the lsb set */
  26         return addr & ~1;
  27 }
  28
  29 extern void ftrace_caller_old(void);
  30 extern void ftrace_call_old(void);
  31 #endif
  32
  33 #endif
  34
  35 #endif
  36
  37 #ifndef __ASSEMBLY__
  38
  39 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
  40 /*
  41  * return_address uses walk_stackframe to do it's work.  If both
  42  * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
  43  * information.  For this to work in the function tracer many functions would
  44  * have to be marked with __notrace.  So for now just depend on
  45  * !CONFIG_ARM_UNWIND.
  46  */
  47
  48 void *return_address(unsigned int);
  49
  50 #else
  51
  52 static inline void *return_address(unsigned int level)
  53 {
  54         return NULL;
  55 }
  56
  57 #endif
  58
  59 #define ftrace_return_address(n) return_address(n)
  60
  61 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  62
  63 static inline bool arch_syscall_match_sym_name(const char *sym,
  64                                                const char *name)
  65 {
  66         if (!strcmp(sym, "sys_mmap2"))
  67                 sym = "sys_mmap_pgoff";
  68         else if (!strcmp(sym, "sys_statfs64_wrapper"))
  69                 sym = "sys_statfs64";
  70         else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
  71                 sym = "sys_fstatfs64";
  72         else if (!strcmp(sym, "sys_arm_fadvise64_64"))
  73                 sym = "sys_fadvise64_64";
  74
  75         /* Ignore case since sym may start with "SyS" instead of "sys" */
  76         return !strcasecmp(sym, name);
  77 }
  78
  79 #endif /* ifndef __ASSEMBLY__ */
  80
  81 #endif /* _ASM_ARM_FTRACE */