1. 根目录:
2. arch
3. arm64
4. kernel
5. sys.c

/*
 * AArch64-specific system calls implementation
 *
 * Copyright (C) 2012 ARM Ltd.
 * Author: Catalin Marinas <catalin.marinas@arm.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/syscalls.h>

asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
			 unsigned long prot, unsigned long flags,
			 unsigned long fd, off_t off)
{
	if (offset_in_page(off) != 0)
		return -EINVAL;

	return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
}

/*
 * Wrappers to pass the pt_regs argument.
 */
#define sys_rt_sigreturn	sys_rt_sigreturn_wrapper

#include <asm/syscalls.h>

#undef __SYSCALL
#define __SYSCALL(nr, sym)	[nr] = sym,

/*
 * The sys_call_table array must be 4K aligned to be accessible from
 * kernel/entry.S.
 */
void *sys_call_table[__NR_syscalls] __aligned(4096) = {
	[0 ... __NR_syscalls - 1] = sys_ni_syscall,
#include <asm/unistd.h>
};