linux/arch/arm/include/asm/ftrace.h
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   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__
  14extern void __gnu_mcount_nc(void);
  15
  16#ifdef CONFIG_DYNAMIC_FTRACE
  17struct dyn_arch_ftrace {
  18#ifdef CONFIG_ARM_MODULE_PLTS
  19        struct module *mod;
  20#endif
  21};
  22
  23static 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#endif
  29
  30#endif
  31
  32#endif
  33
  34#ifndef __ASSEMBLY__
  35
  36#if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
  37/*
  38 * return_address uses walk_stackframe to do it's work.  If both
  39 * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
  40 * information.  For this to work in the function tracer many functions would
  41 * have to be marked with __notrace.  So for now just depend on
  42 * !CONFIG_ARM_UNWIND.
  43 */
  44
  45void *return_address(unsigned int);
  46
  47#else
  48
  49static inline void *return_address(unsigned int level)
  50{
  51        return NULL;
  52}
  53
  54#endif
  55
  56#define ftrace_return_address(n) return_address(n)
  57
  58#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  59
  60static inline bool arch_syscall_match_sym_name(const char *sym,
  61                                               const char *name)
  62{
  63        if (!strcmp(sym, "sys_mmap2"))
  64                sym = "sys_mmap_pgoff";
  65        else if (!strcmp(sym, "sys_statfs64_wrapper"))
  66                sym = "sys_statfs64";
  67        else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
  68                sym = "sys_fstatfs64";
  69        else if (!strcmp(sym, "sys_arm_fadvise64_64"))
  70                sym = "sys_fadvise64_64";
  71
  72        /* Ignore case since sym may start with "SyS" instead of "sys" */
  73        return !strcasecmp(sym, name);
  74}
  75
  76#endif /* ifndef __ASSEMBLY__ */
  77
  78#endif /* _ASM_ARM_FTRACE */
  79