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 #define HAVE_FUNCTION_GRAPH_FP_TEST
   6
   7 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
   8 #define ARCH_SUPPORTS_FTRACE_OPS 1
   9 #endif
  10
  11 #ifdef CONFIG_FUNCTION_TRACER
  12 #define MCOUNT_ADDR             ((unsigned long)(__gnu_mcount_nc))
  13 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
  14
  15 #ifndef __ASSEMBLY__
  16 extern void __gnu_mcount_nc(void);
  17
  18 #ifdef CONFIG_DYNAMIC_FTRACE
  19 struct dyn_arch_ftrace {
  20 #ifdef CONFIG_ARM_MODULE_PLTS
  21         struct module *mod;
  22 #endif
  23 };
  24
  25 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  26 {
  27         /* With Thumb-2, the recorded addresses have the lsb set */
  28         return addr & ~1;
  29 }
  30 #endif
  31
  32 #endif
  33
  34 #endif
  35
  36 #ifndef __ASSEMBLY__
  37
  38 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
  39 /*
  40  * return_address uses walk_stackframe to do it's work.  If both
  41  * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
  42  * information.  For this to work in the function tracer many functions would
  43  * have to be marked with __notrace.  So for now just depend on
  44  * !CONFIG_ARM_UNWIND.
  45  */
  46
  47 void *return_address(unsigned int);
  48
  49 #else
  50
  51 static inline void *return_address(unsigned int level)
  52 {
  53        return NULL;
  54 }
  55
  56 #endif
  57
  58 #define ftrace_return_address(n) return_address(n)
  59
  60 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  61
  62 static inline bool arch_syscall_match_sym_name(const char *sym,
  63                                                const char *name)
  64 {
  65         if (!strcmp(sym, "sys_mmap2"))
  66                 sym = "sys_mmap_pgoff";
  67         else if (!strcmp(sym, "sys_statfs64_wrapper"))
  68                 sym = "sys_statfs64";
  69         else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
  70                 sym = "sys_fstatfs64";
  71         else if (!strcmp(sym, "sys_arm_fadvise64_64"))
  72                 sym = "sys_fadvise64_64";
  73
  74         /* Ignore case since sym may start with "SyS" instead of "sys" */
  75         return !strcasecmp(sym, name);
  76 }
  77
  78 void prepare_ftrace_return(unsigned long *parent, unsigned long self,
  79                            unsigned long frame_pointer,
  80                            unsigned long stack_pointer);
  81
  82 #endif /* ifndef __ASSEMBLY__ */
  83
  84 #endif /* _ASM_ARM_FTRACE */