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
31static inline unsigned long ftrace_call_adjust(unsigned long addr)
32{
33	/*
34	 * addr is the address of the mcount call instruction.
35	 * recordmcount does the necessary offset calculation.
36	 */
37	return addr;
38}
39
40#define ftrace_return_address(n) return_address(n)
41
42/*
43 * Because AArch32 mode does not share the same syscall table with AArch64,
44 * tracing compat syscalls may result in reporting bogus syscalls or even
45 * hang-up, so just do not trace them.
46 * See kernel/trace/trace_syscalls.c
47 *
48 * x86 code says:
49 * If the user realy wants these, then they should use the
50 * raw syscall tracepoints with filtering.
51 */
52#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
53static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
54{
55	return is_compat_task();
56}
57#endif /* ifndef __ASSEMBLY__ */
58
59#endif /* __ASM_FTRACE_H */
60