LXR linux/arch/arm64/kernel/sys.c

   1/*
   2 * AArch64-specific system calls implementation
   3 *
   4 * Copyright (C) 2012 ARM Ltd.
   5 * Author: Catalin Marinas <catalin.marinas@arm.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include <linux/compiler.h>
  21#include <linux/errno.h>
  22#include <linux/fs.h>
  23#include <linux/mm.h>
  24#include <linux/export.h>
  25#include <linux/sched.h>
  26#include <linux/slab.h>
  27#include <linux/syscalls.h>
  28#include <asm/cpufeature.h>
  29
  30asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
  31                         unsigned long prot, unsigned long flags,
  32                         unsigned long fd, off_t off)
  33{
  34        if (offset_in_page(off) != 0)
  35                return -EINVAL;
  36
  37        return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
  38}
  39
  40SYSCALL_DEFINE1(arm64_personality, unsigned int, personality)
  41{
  42        if (personality(personality) == PER_LINUX32 &&
  43                !system_supports_32bit_el0())
  44                return -EINVAL;
  45        return sys_personality(personality);
  46}
  47
  48/*
  49 * Wrappers to pass the pt_regs argument.
  50 */
  51asmlinkage long sys_rt_sigreturn_wrapper(void);
  52#define sys_rt_sigreturn        sys_rt_sigreturn_wrapper
  53#define sys_personality         sys_arm64_personality
  54
  55#undef __SYSCALL
  56#define __SYSCALL(nr, sym)      [nr] = sym,
  57
  58/*
  59 * The sys_call_table array must be 4K aligned to be accessible from
  60 * kernel/entry.S.
  61 */
  62void * const sys_call_table[__NR_syscalls] __aligned(4096) = {
  63        [0 ... __NR_syscalls - 1] = sys_ni_syscall,
  64#include <asm/unistd.h>
  65};
  66