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