arch/arm64/include/asm/ftrace.h

   1 /*
   2  * arch/arm64/include/asm/ftrace.h
   3  *
   4  * Copyright (C) 2013 Linaro Limited
   5  * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef __ASM_FTRACE_H
  12 #define __ASM_FTRACE_H
  13
  14 #include <asm/insn.h>
  15
  16 #define MCOUNT_ADDR             ((unsigned long)_mcount)
  17 #define MCOUNT_INSN_SIZE        AARCH64_INSN_SIZE
  18
  19 #ifndef __ASSEMBLY__
  20 #include <linux/compat.h>
  21
  22 extern void _mcount(unsigned long);
  23 extern void *return_address(unsigned int);
  24
  25 struct dyn_arch_ftrace {
  26         /* No extra data needed for arm64 */
  27 };
  28
  29 extern unsigned long ftrace_graph_call;
  30
  31 extern void return_to_handler(void);
  32
  33 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  34 {
  35         /*
  36          * addr is the address of the mcount call instruction.
  37          * recordmcount does the necessary offset calculation.
  38          */
  39         return addr;
  40 }
  41
  42 #define ftrace_return_address(n) return_address(n)
  43
  44 /*
  45  * Because AArch32 mode does not share the same syscall table with AArch64,
  46  * tracing compat syscalls may result in reporting bogus syscalls or even
  47  * hang-up, so just do not trace them.
  48  * See kernel/trace/trace_syscalls.c
  49  *
  50  * x86 code says:
  51  * If the user really wants these, then they should use the
  52  * raw syscall tracepoints with filtering.
  53  */
  54 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
  55 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
  56 {
  57         return is_compat_task();
  58 }
  59 #endif /* ifndef __ASSEMBLY__ */
  60
  61 #endif /* __ASM_FTRACE_H */