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