arch/sh/kernel/sys_sh.c

   1 /*
   2  * linux/arch/sh/kernel/sys_sh.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/SuperH
   6  * platform.
   7  *
   8  * Taken from i386 version.
   9  */
  10 #include <linux/errno.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/smp.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/mman.h>
  20 #include <linux/file.h>
  21 #include <linux/utsname.h>
  22 #include <linux/module.h>
  23 #include <linux/fs.h>
  24 #include <linux/ipc.h>
  25 #include <asm/syscalls.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/unistd.h>
  28
  29 static inline long
  30 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  31          unsigned long flags, int fd, unsigned long pgoff)
  32 {
  33         int error = -EBADF;
  34         struct file *file = NULL;
  35
  36         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  37         if (!(flags & MAP_ANONYMOUS)) {
  38                 file = fget(fd);
  39                 if (!file)
  40                         goto out;
  41         }
  42
  43         down_write(&current->mm->mmap_sem);
  44         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  45         up_write(&current->mm->mmap_sem);
  46
  47         if (file)
  48                 fput(file);
  49 out:
  50         return error;
  51 }
  52
  53 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
  54         unsigned long prot, unsigned long flags,
  55         int fd, unsigned long off)
  56 {
  57         if (off & ~PAGE_MASK)
  58                 return -EINVAL;
  59         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
  60 }
  61
  62 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  63         unsigned long prot, unsigned long flags,
  64         unsigned long fd, unsigned long pgoff)
  65 {
  66         /*
  67          * The shift for mmap2 is constant, regardless of PAGE_SIZE
  68          * setting.
  69          */
  70         if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
  71                 return -EINVAL;
  72
  73         pgoff >>= PAGE_SHIFT - 12;
  74
  75         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  76 }
  77
  78 /*
  79  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  80  *
  81  * This is really horribly ugly.
  82  */
  83 asmlinkage int sys_ipc(uint call, int first, int second,
  84                        int third, void __user *ptr, long fifth)
  85 {
  86         int version, ret;
  87
  88         version = call >> 16; /* hack for backward compatibility */
  89         call &= 0xffff;
  90
  91         if (call <= SEMTIMEDOP)
  92                 switch (call) {
  93                 case SEMOP:
  94                         return sys_semtimedop(first,
  95                                               (struct sembuf __user *)ptr,
  96                                               second, NULL);
  97                 case SEMTIMEDOP:
  98                         return sys_semtimedop(first,
  99                                 (struct sembuf __user *)ptr, second,
 100                                 (const struct timespec __user *)fifth);
 101                 case SEMGET:
 102                         return sys_semget (first, second, third);
 103                 case SEMCTL: {
 104                         union semun fourth;
 105                         if (!ptr)
 106                                 return -EINVAL;
 107                         if (get_user(fourth.__pad, (void __user * __user *) ptr))
 108                                 return -EFAULT;
 109                         return sys_semctl (first, second, third, fourth);
 110                         }
 111                 default:
 112                         return -EINVAL;
 113                 }
 114
 115         if (call <= MSGCTL)
 116                 switch (call) {
 117                 case MSGSND:
 118                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 119                                           second, third);
 120                 case MSGRCV:
 121                         switch (version) {
 122                         case 0:
 123                         {
 124                                 struct ipc_kludge tmp;
 125
 126                                 if (!ptr)
 127                                         return -EINVAL;
 128
 129                                 if (copy_from_user(&tmp,
 130                                         (struct ipc_kludge __user *) ptr,
 131                                                    sizeof (tmp)))
 132                                         return -EFAULT;
 133
 134                                 return sys_msgrcv (first, tmp.msgp, second,
 135                                                    tmp.msgtyp, third);
 136                         }
 137                         default:
 138                                 return sys_msgrcv (first,
 139                                                    (struct msgbuf __user *) ptr,
 140                                                    second, fifth, third);
 141                         }
 142                 case MSGGET:
 143                         return sys_msgget ((key_t) first, second);
 144                 case MSGCTL:
 145                         return sys_msgctl (first, second,
 146                                            (struct msqid_ds __user *) ptr);
 147                 default:
 148                         return -EINVAL;
 149                 }
 150         if (call <= SHMCTL)
 151                 switch (call) {
 152                 case SHMAT:
 153                         switch (version) {
 154                         default: {
 155                                 ulong raddr;
 156                                 ret = do_shmat (first, (char __user *) ptr,
 157                                                  second, &raddr);
 158                                 if (ret)
 159                                         return ret;
 160                                 return put_user (raddr, (ulong __user *) third);
 161                         }
 162                         case 1: /* iBCS2 emulator entry point */
 163                                 if (!segment_eq(get_fs(), get_ds()))
 164                                         return -EINVAL;
 165                                 return do_shmat (first, (char __user *) ptr,
 166                                                   second, (ulong *) third);
 167                         }
 168                 case SHMDT:
 169                         return sys_shmdt ((char __user *)ptr);
 170                 case SHMGET:
 171                         return sys_shmget (first, second, third);
 172                 case SHMCTL:
 173                         return sys_shmctl (first, second,
 174                                            (struct shmid_ds __user *) ptr);
 175                 default:
 176                         return -EINVAL;
 177                 }
 178
 179         return -EINVAL;
 180 }
 181
 182 asmlinkage int sys_uname(struct old_utsname __user *name)
 183 {
 184         int err;
 185         if (!name)
 186                 return -EFAULT;
 187         down_read(&uts_sem);
 188         err = copy_to_user(name, utsname(), sizeof(*name));
 189         up_read(&uts_sem);
 190         return err?-EFAULT:0;
 191 }