LXR linux/arch/arm/include/asm/ftrace.h

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