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
  30 asmlinkage 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
  40 SYSCALL_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  */
  51 asmlinkage 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  */
  62 void * const sys_call_table[__NR_syscalls] __aligned(4096) = {
  63         [0 ... __NR_syscalls - 1] = sys_ni_syscall,
  64 #include <asm/unistd.h>
  65 };