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         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  67 }
  68
  69 /*
  70  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  71  *
  72  * This is really horribly ugly.
  73  */
  74 asmlinkage int sys_ipc(uint call, int first, int second,
  75                        int third, void __user *ptr, long fifth)
  76 {
  77         int version, ret;
  78
  79         version = call >> 16; /* hack for backward compatibility */
  80         call &= 0xffff;
  81
  82         trace_mark(kernel_arch_ipc_call, "call %u first %d", call, first);
  83
  84         if (call <= SEMTIMEDOP)
  85                 switch (call) {
  86                 case SEMOP:
  87                         return sys_semtimedop(first,
  88                                               (struct sembuf __user *)ptr,
  89                                               second, NULL);
  90                 case SEMTIMEDOP:
  91                         return sys_semtimedop(first,
  92                                 (struct sembuf __user *)ptr, second,
  93                                 (const struct timespec __user *)fifth);
  94                 case SEMGET:
  95                         return sys_semget (first, second, third);
  96                 case SEMCTL: {
  97                         union semun fourth;
  98                         if (!ptr)
  99                                 return -EINVAL;
 100                         if (get_user(fourth.__pad, (void __user * __user *) ptr))
 101                                 return -EFAULT;
 102                         return sys_semctl (first, second, third, fourth);
 103                         }
 104                 default:
 105                         return -EINVAL;
 106                 }
 107
 108         if (call <= MSGCTL)
 109                 switch (call) {
 110                 case MSGSND:
 111                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 112                                           second, third);
 113                 case MSGRCV:
 114                         switch (version) {
 115                         case 0:
 116                         {
 117                                 struct ipc_kludge tmp;
 118
 119                                 if (!ptr)
 120                                         return -EINVAL;
 121
 122                                 if (copy_from_user(&tmp,
 123                                         (struct ipc_kludge __user *) ptr,
 124                                                    sizeof (tmp)))
 125                                         return -EFAULT;
 126
 127                                 return sys_msgrcv (first, tmp.msgp, second,
 128                                                    tmp.msgtyp, third);
 129                         }
 130                         default:
 131                                 return sys_msgrcv (first,
 132                                                    (struct msgbuf __user *) ptr,
 133                                                    second, fifth, third);
 134                         }
 135                 case MSGGET:
 136                         return sys_msgget ((key_t) first, second);
 137                 case MSGCTL:
 138                         return sys_msgctl (first, second,
 139                                            (struct msqid_ds __user *) ptr);
 140                 default:
 141                         return -EINVAL;
 142                 }
 143         if (call <= SHMCTL)
 144                 switch (call) {
 145                 case SHMAT:
 146                         switch (version) {
 147                         default: {
 148                                 ulong raddr;
 149                                 ret = do_shmat (first, (char __user *) ptr,
 150                                                  second, &raddr);
 151                                 if (ret)
 152                                         return ret;
 153                                 return put_user (raddr, (ulong __user *) third);
 154                         }
 155                         case 1: /* iBCS2 emulator entry point */
 156                                 if (!segment_eq(get_fs(), get_ds()))
 157                                         return -EINVAL;
 158                                 return do_shmat (first, (char __user *) ptr,
 159                                                   second, (ulong *) third);
 160                         }
 161                 case SHMDT:
 162                         return sys_shmdt ((char __user *)ptr);
 163                 case SHMGET:
 164                         return sys_shmget (first, second, third);
 165                 case SHMCTL:
 166                         return sys_shmctl (first, second,
 167                                            (struct shmid_ds __user *) ptr);
 168                 default:
 169                         return -EINVAL;
 170                 }
 171
 172         return -EINVAL;
 173 }
 174
 175 asmlinkage int sys_uname(struct old_utsname __user *name)
 176 {
 177         int err;
 178         if (!name)
 179                 return -EFAULT;
 180         down_read(&uts_sem);
 181         err = copy_to_user(name, utsname(), sizeof(*name));
 182         up_read(&uts_sem);
 183         return err?-EFAULT:0;
 184 }