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         trace_mark(kernel_arch_ipc_call, "call %u first %d", call, first);
  92
  93         if (call <= SEMTIMEDOP)
  94                 switch (call) {
  95                 case SEMOP:
  96                         return sys_semtimedop(first,
  97                                               (struct sembuf __user *)ptr,
  98                                               second, NULL);
  99                 case SEMTIMEDOP:
 100                         return sys_semtimedop(first,
 101                                 (struct sembuf __user *)ptr, second,
 102                                 (const struct timespec __user *)fifth);
 103                 case SEMGET:
 104                         return sys_semget (first, second, third);
 105                 case SEMCTL: {
 106                         union semun fourth;
 107                         if (!ptr)
 108                                 return -EINVAL;
 109                         if (get_user(fourth.__pad, (void __user * __user *) ptr))
 110                                 return -EFAULT;
 111                         return sys_semctl (first, second, third, fourth);
 112                         }
 113                 default:
 114                         return -EINVAL;
 115                 }
 116
 117         if (call <= MSGCTL)
 118                 switch (call) {
 119                 case MSGSND:
 120                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 121                                           second, third);
 122                 case MSGRCV:
 123                         switch (version) {
 124                         case 0:
 125                         {
 126                                 struct ipc_kludge tmp;
 127
 128                                 if (!ptr)
 129                                         return -EINVAL;
 130
 131                                 if (copy_from_user(&tmp,
 132                                         (struct ipc_kludge __user *) ptr,
 133                                                    sizeof (tmp)))
 134                                         return -EFAULT;
 135
 136                                 return sys_msgrcv (first, tmp.msgp, second,
 137                                                    tmp.msgtyp, third);
 138                         }
 139                         default:
 140                                 return sys_msgrcv (first,
 141                                                    (struct msgbuf __user *) ptr,
 142                                                    second, fifth, third);
 143                         }
 144                 case MSGGET:
 145                         return sys_msgget ((key_t) first, second);
 146                 case MSGCTL:
 147                         return sys_msgctl (first, second,
 148                                            (struct msqid_ds __user *) ptr);
 149                 default:
 150                         return -EINVAL;
 151                 }
 152         if (call <= SHMCTL)
 153                 switch (call) {
 154                 case SHMAT:
 155                         switch (version) {
 156                         default: {
 157                                 ulong raddr;
 158                                 ret = do_shmat (first, (char __user *) ptr,
 159                                                  second, &raddr);
 160                                 if (ret)
 161                                         return ret;
 162                                 return put_user (raddr, (ulong __user *) third);
 163                         }
 164                         case 1: /* iBCS2 emulator entry point */
 165                                 if (!segment_eq(get_fs(), get_ds()))
 166                                         return -EINVAL;
 167                                 return do_shmat (first, (char __user *) ptr,
 168                                                   second, (ulong *) third);
 169                         }
 170                 case SHMDT:
 171                         return sys_shmdt ((char __user *)ptr);
 172                 case SHMGET:
 173                         return sys_shmget (first, second, third);
 174                 case SHMCTL:
 175                         return sys_shmctl (first, second,
 176                                            (struct shmid_ds __user *) ptr);
 177                 default:
 178                         return -EINVAL;
 179                 }
 180
 181         return -EINVAL;
 182 }
 183
 184 asmlinkage int sys_uname(struct old_utsname __user *name)
 185 {
 186         int err;
 187         if (!name)
 188                 return -EFAULT;
 189         down_read(&uts_sem);
 190         err = copy_to_user(name, utsname(), sizeof(*name));
 191         up_read(&uts_sem);
 192         return err?-EFAULT:0;
 193 }