arch/x86/um/syscalls_64.c

   1 /*
   2  * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Copyright 2003 PathScale, Inc.
   4  *
   5  * Licensed under the GPL
   6  */
   7
   8 #include <linux/sched.h>
   9 #include <linux/sched/mm.h>
  10 #include <linux/syscalls.h>
  11 #include <linux/uaccess.h>
  12 #include <asm/prctl.h> /* XXX This should get the constants from libc */
  13 #include <registers.h>
  14 #include <os.h>
  15
  16 long arch_prctl(struct task_struct *task, int option,
  17                 unsigned long __user *arg2)
  18 {
  19         long ret = -EINVAL;
  20
  21         switch (option) {
  22         case ARCH_SET_FS:
  23                 current->thread.regs.regs.gp[FS_BASE / sizeof(unsigned long)] =
  24                         (unsigned long) arg2;
  25                 ret = 0;
  26                 break;
  27         case ARCH_SET_GS:
  28                 current->thread.regs.regs.gp[GS_BASE / sizeof(unsigned long)] =
  29                         (unsigned long) arg2;
  30                 ret = 0;
  31                 break;
  32         case ARCH_GET_FS:
  33                 ret = put_user(current->thread.regs.regs.gp[FS_BASE / sizeof(unsigned long)], arg2);
  34                 break;
  35         case ARCH_GET_GS:
  36                 ret = put_user(current->thread.regs.regs.gp[GS_BASE / sizeof(unsigned long)], arg2);
  37                 break;
  38         }
  39
  40         return ret;
  41 }
  42
  43 SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
  44 {
  45         return arch_prctl(current, option, (unsigned long __user *) arg2);
  46 }
  47
  48 void arch_switch_to(struct task_struct *to)
  49 {
  50         /*
  51          * Nothing needs to be done on x86_64.
  52          * The FS_BASE/GS_BASE registers are saved in the ptrace register set.
  53          */
  54 }
  55
  56 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
  57                 unsigned long, prot, unsigned long, flags,
  58                 unsigned long, fd, unsigned long, off)
  59 {
  60         if (off & ~PAGE_MASK)
  61                 return -EINVAL;
  62
  63         return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
  64 }