arch/arm/include/asm/ftrace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_ARM_FTRACE
   3 #define _ASM_ARM_FTRACE
   4
   5 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
   6 #define ARCH_SUPPORTS_FTRACE_OPS 1
   7 #endif
   8
   9 #ifdef CONFIG_FUNCTION_TRACER
  10 #define MCOUNT_ADDR             ((unsigned long)(__gnu_mcount_nc))
  11 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
  12
  13 #ifndef __ASSEMBLY__
  14 extern void mcount(void);
  15 extern void __gnu_mcount_nc(void);
  16
  17 #ifdef CONFIG_DYNAMIC_FTRACE
  18 struct dyn_arch_ftrace {
  19 #ifdef CONFIG_OLD_MCOUNT
  20         bool    old_mcount;
  21 #endif
  22 };
  23
  24 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  25 {
  26         /* With Thumb-2, the recorded addresses have the lsb set */
  27         return addr & ~1;
  28 }
  29
  30 extern void ftrace_caller_old(void);
  31 extern void ftrace_call_old(void);
  32 #endif
  33
  34 #endif
  35
  36 #endif
  37
  38 #ifndef __ASSEMBLY__
  39
  40 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
  41 /*
  42  * return_address uses walk_stackframe to do it's work.  If both
  43  * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
  44  * information.  For this to work in the function tracer many functions would
  45  * have to be marked with __notrace.  So for now just depend on
  46  * !CONFIG_ARM_UNWIND.
  47  */
  48
  49 void *return_address(unsigned int);
  50
  51 #else
  52
  53 static inline void *return_address(unsigned int level)
  54 {
  55         return NULL;
  56 }
  57
  58 #endif
  59
  60 #define ftrace_return_address(n) return_address(n)
  61
  62 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  63
  64 static inline bool arch_syscall_match_sym_name(const char *sym,
  65                                                const char *name)
  66 {
  67         if (!strcmp(sym, "sys_mmap2"))
  68                 sym = "sys_mmap_pgoff";
  69         else if (!strcmp(sym, "sys_statfs64_wrapper"))
  70                 sym = "sys_statfs64";
  71         else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
  72                 sym = "sys_fstatfs64";
  73         else if (!strcmp(sym, "sys_arm_fadvise64_64"))
  74                 sym = "sys_fadvise64_64";
  75
  76         /* Ignore case since sym may start with "SyS" instead of "sys" */
  77         return !strcasecmp(sym, name);
  78 }
  79
  80 #endif /* ifndef __ASSEMBLY__ */
  81
  82 #endif /* _ASM_ARM_FTRACE */