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Directory :  /proc/self/root/lib/modules/5.4.0-163-generic/build/arch/arm64/include/asm/

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Current File : /proc/self/root/lib/modules/5.4.0-163-generic/build/arch/arm64/include/asm//ftrace.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * arch/arm64/include/asm/ftrace.h
 *
 * Copyright (C) 2013 Linaro Limited
 * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
 */
#ifndef __ASM_FTRACE_H
#define __ASM_FTRACE_H

#include <asm/insn.h>

#define HAVE_FUNCTION_GRAPH_FP_TEST
#define MCOUNT_ADDR		((unsigned long)_mcount)
#define MCOUNT_INSN_SIZE	AARCH64_INSN_SIZE

/*
 * Currently, gcc tends to save the link register after the local variables
 * on the stack. This causes the max stack tracer to report the function
 * frame sizes for the wrong functions. By defining
 * ARCH_FTRACE_SHIFT_STACK_TRACER, it will tell the stack tracer to expect
 * to find the return address on the stack after the local variables have
 * been set up.
 *
 * Note, this may change in the future, and we will need to deal with that
 * if it were to happen.
 */
#define ARCH_FTRACE_SHIFT_STACK_TRACER 1

#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 */

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