tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 HAVE_FUNCTION_GRAPH_FP_TEST
17#define MCOUNT_ADDR ((unsigned long)_mcount)
18#define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE
19
20#ifndef __ASSEMBLY__
21#include <linux/compat.h>
22
23extern void _mcount(unsigned long);
24extern void *return_address(unsigned int);
25
26struct dyn_arch_ftrace {
27 /* No extra data needed for arm64 */
28};
29
30extern unsigned long ftrace_graph_call;
31
32extern void return_to_handler(void);
33
34static inline unsigned long ftrace_call_adjust(unsigned long addr)
35{
36 /*
37 * addr is the address of the mcount call instruction.
38 * recordmcount does the necessary offset calculation.
39 */
40 return addr;
41}
42
43#define ftrace_return_address(n) return_address(n)
44
45/*
46 * Because AArch32 mode does not share the same syscall table with AArch64,
47 * tracing compat syscalls may result in reporting bogus syscalls or even
48 * hang-up, so just do not trace them.
49 * See kernel/trace/trace_syscalls.c
50 *
51 * x86 code says:
52 * If the user really wants these, then they should use the
53 * raw syscall tracepoints with filtering.
54 */
55#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
56static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
57{
58 return is_compat_task();
59}
60
61#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
62
63static inline bool arch_syscall_match_sym_name(const char *sym,
64 const char *name)
65{
66 /*
67 * Since all syscall functions have __arm64_ prefix, we must skip it.
68 * However, as we described above, we decided to ignore compat
69 * syscalls, so we don't care about __arm64_compat_ prefix here.
70 */
71 return !strcmp(sym + 8, name);
72}
73#endif /* ifndef __ASSEMBLY__ */
74
75#endif /* __ASM_FTRACE_H */