LXR linux/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
  22extern void _mcount(unsigned long);
  23extern void *return_address(unsigned int);
  24
  25struct dyn_arch_ftrace {
  26        /* No extra data needed for arm64 */
  27};
  28
  29extern unsigned long ftrace_graph_call;
  30
  31extern void return_to_handler(void);
  32
  33static 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
  55static 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 */
  62