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 23 extern void _mcount(unsigned long); 24 extern void *return_address(unsigned int); 25 26 struct dyn_arch_ftrace { 27 /* No extra data needed for arm64 */ 28 }; 29 30 extern unsigned long ftrace_graph_call; 31 32 extern void return_to_handler(void); 33 34 static 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 56 static 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 63 static 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 */ 76