Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
AKASHI Takahiro | 819e50e | 2014-04-30 18:54:33 +0900 | [diff] [blame] | 2 | /* |
| 3 | * arch/arm64/include/asm/ftrace.h |
| 4 | * |
| 5 | * Copyright (C) 2013 Linaro Limited |
| 6 | * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> |
AKASHI Takahiro | 819e50e | 2014-04-30 18:54:33 +0900 | [diff] [blame] | 7 | */ |
| 8 | #ifndef __ASM_FTRACE_H |
| 9 | #define __ASM_FTRACE_H |
| 10 | |
| 11 | #include <asm/insn.h> |
| 12 | |
Mark Rutland | 5c176af | 2018-11-15 22:42:00 +0000 | [diff] [blame] | 13 | #define HAVE_FUNCTION_GRAPH_FP_TEST |
AKASHI Takahiro | 819e50e | 2014-04-30 18:54:33 +0900 | [diff] [blame] | 14 | #define MCOUNT_ADDR ((unsigned long)_mcount) |
| 15 | #define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE |
| 16 | |
| 17 | #ifndef __ASSEMBLY__ |
AKASHI Takahiro | 055b121 | 2014-04-30 10:54:36 +0100 | [diff] [blame] | 18 | #include <linux/compat.h> |
| 19 | |
AKASHI Takahiro | 819e50e | 2014-04-30 18:54:33 +0900 | [diff] [blame] | 20 | extern void _mcount(unsigned long); |
AKASHI Takahiro | 3711784 | 2014-04-30 10:54:35 +0100 | [diff] [blame] | 21 | extern void *return_address(unsigned int); |
AKASHI Takahiro | bd7d38d | 2014-04-30 10:54:34 +0100 | [diff] [blame] | 22 | |
| 23 | struct dyn_arch_ftrace { |
| 24 | /* No extra data needed for arm64 */ |
| 25 | }; |
| 26 | |
| 27 | extern unsigned long ftrace_graph_call; |
| 28 | |
AKASHI Takahiro | 20380bb | 2015-12-15 17:33:41 +0900 | [diff] [blame] | 29 | extern void return_to_handler(void); |
| 30 | |
AKASHI Takahiro | bd7d38d | 2014-04-30 10:54:34 +0100 | [diff] [blame] | 31 | static 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 | } |
AKASHI Takahiro | 3711784 | 2014-04-30 10:54:35 +0100 | [diff] [blame] | 39 | |
| 40 | #define ftrace_return_address(n) return_address(n) |
AKASHI Takahiro | 055b121 | 2014-04-30 10:54:36 +0100 | [diff] [blame] | 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: |
Adam Buchbinder | ef769e3 | 2016-02-24 09:52:41 -0800 | [diff] [blame] | 49 | * If the user really wants these, then they should use the |
AKASHI Takahiro | 055b121 | 2014-04-30 10:54:36 +0100 | [diff] [blame] | 50 | * raw syscall tracepoints with filtering. |
| 51 | */ |
| 52 | #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS |
| 53 | static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) |
| 54 | { |
| 55 | return is_compat_task(); |
| 56 | } |
Masami Hiramatsu | 874bfc6 | 2018-11-29 14:39:33 +0900 | [diff] [blame] | 57 | |
| 58 | #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME |
| 59 | |
| 60 | static inline bool arch_syscall_match_sym_name(const char *sym, |
| 61 | const char *name) |
| 62 | { |
| 63 | /* |
| 64 | * Since all syscall functions have __arm64_ prefix, we must skip it. |
| 65 | * However, as we described above, we decided to ignore compat |
| 66 | * syscalls, so we don't care about __arm64_compat_ prefix here. |
| 67 | */ |
| 68 | return !strcmp(sym + 8, name); |
| 69 | } |
AKASHI Takahiro | 3711784 | 2014-04-30 10:54:35 +0100 | [diff] [blame] | 70 | #endif /* ifndef __ASSEMBLY__ */ |
AKASHI Takahiro | 819e50e | 2014-04-30 18:54:33 +0900 | [diff] [blame] | 71 | |
| 72 | #endif /* __ASM_FTRACE_H */ |