1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm64/include/asm/ftrace.h 4 * 5 * Copyright (C) 2013 Linaro Limited 6 * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> 7 */ 8 #ifndef __ASM_FTRACE_H 9 #define __ASM_FTRACE_H 10 11 #include <asm/insn.h> 12 13 #define HAVE_FUNCTION_GRAPH_FP_TEST 14 #define MCOUNT_ADDR ((unsigned long)_mcount) 15 #define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE 16 17 #ifndef __ASSEMBLY__ 18 #include <linux/compat.h> 19 20 extern void _mcount(unsigned long); 21 extern void *return_address(unsigned int); 22 23 struct dyn_arch_ftrace { 24 /* No extra data needed for arm64 */ 25 }; 26 27 extern unsigned long ftrace_graph_call; 28 29 extern void return_to_handler(void); 30 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 } 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 really wants these, then they should use the 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 } 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 } 70 #endif /* ifndef __ASSEMBLY__ */ 71 72 #endif /* __ASM_FTRACE_H */ 73