/* * arch/arm64/include/asm/ftrace.h * * Copyright (C) 2013 Linaro Limited * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __ASM_FTRACE_H #define __ASM_FTRACE_H #include <asm/insn.h> #define MCOUNT_ADDR ((unsigned long)_mcount) #define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE #ifndef __ASSEMBLY__ #include <linux/compat.h> extern void _mcount(unsigned long); extern void *return_address(unsigned int); struct dyn_arch_ftrace { /* No extra data needed for arm64 */ }; extern unsigned long ftrace_graph_call; extern void return_to_handler(void); static inline unsigned long ftrace_call_adjust(unsigned long addr) { /* * addr is the address of the mcount call instruction. * recordmcount does the necessary offset calculation. */ return addr; } #define ftrace_return_address(n) return_address(n) /* * Because AArch32 mode does not share the same syscall table with AArch64, * tracing compat syscalls may result in reporting bogus syscalls or even * hang-up, so just do not trace them. * See kernel/trace/trace_syscalls.c * * x86 code says: * If the user really wants these, then they should use the * raw syscall tracepoints with filtering. */ #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) { return is_compat_task(); } #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) { /* * Since all syscall functions have __arm64_ prefix, we must skip it. * However, as we described above, we decided to ignore compat * syscalls, so we don't care about __arm64_compat_ prefix here. */ return !strcmp(sym + 8, name); } #endif /* ifndef __ASSEMBLY__ */ #endif /* __ASM_FTRACE_H */