arch/s390/kernel/sys_s390.c

   1 /*
   2  *  arch/s390/kernel/sys_s390.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7  *               Thomas Spatzier (tspat@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/sys_i386.c"
  10  *
  11  *  This file contains various random system calls that
  12  *  have a non-standard calling sequence on the Linux/s390
  13  *  platform.
  14  */
  15
  16 #include <linux/errno.h>
  17 #include <linux/sched.h>
  18 #include <linux/mm.h>
  19 #include <linux/smp.h>
  20 #include <linux/sem.h>
  21 #include <linux/msg.h>
  22 #include <linux/shm.h>
  23 #include <linux/stat.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/mman.h>
  26 #include <linux/file.h>
  27 #include <linux/utsname.h>
  28 #include <linux/personality.h>
  29 #include <linux/unistd.h>
  30
  31 #include <asm/uaccess.h>
  32 #include <asm/ipc.h>
  33
  34 /*
  35  * sys_pipe() is the normal C calling standard for creating
  36  * a pipe. It's not the way Unix traditionally does this, though.
  37  */
  38 asmlinkage long sys_pipe(unsigned long __user *fildes)
  39 {
  40         int fd[2];
  41         int error;
  42
  43         error = do_pipe(fd);
  44         if (!error) {
  45                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  46                         error = -EFAULT;
  47         }
  48         return error;
  49 }
  50
  51 /* common code for old and new mmaps */
  52 static inline long do_mmap2(
  53         unsigned long addr, unsigned long len,
  54         unsigned long prot, unsigned long flags,
  55         unsigned long fd, unsigned long pgoff)
  56 {
  57         long error = -EBADF;
  58         struct file * file = NULL;
  59
  60         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  61         if (!(flags & MAP_ANONYMOUS)) {
  62                 file = fget(fd);
  63                 if (!file)
  64                         goto out;
  65         }
  66
  67         down_write(&current->mm->mmap_sem);
  68         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  69         up_write(&current->mm->mmap_sem);
  70
  71         if (file)
  72                 fput(file);
  73 out:
  74         return error;
  75 }
  76
  77 /*
  78  * Perform the select(nd, in, out, ex, tv) and mmap() system
  79  * calls. Linux for S/390 isn't able to handle more than 5
  80  * system call parameters, so these system calls used a memory
  81  * block for parameter passing..
  82  */
  83
  84 struct mmap_arg_struct {
  85         unsigned long addr;
  86         unsigned long len;
  87         unsigned long prot;
  88         unsigned long flags;
  89         unsigned long fd;
  90         unsigned long offset;
  91 };
  92
  93 asmlinkage long sys_mmap2(struct mmap_arg_struct __user  *arg)
  94 {
  95         struct mmap_arg_struct a;
  96         int error = -EFAULT;
  97
  98         if (copy_from_user(&a, arg, sizeof(a)))
  99                 goto out;
 100         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 101 out:
 102         return error;
 103 }
 104
 105 asmlinkage long old_mmap(struct mmap_arg_struct __user *arg)
 106 {
 107         struct mmap_arg_struct a;
 108         long error = -EFAULT;
 109
 110         if (copy_from_user(&a, arg, sizeof(a)))
 111                 goto out;
 112
 113         error = -EINVAL;
 114         if (a.offset & ~PAGE_MASK)
 115                 goto out;
 116
 117         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 118 out:
 119         return error;
 120 }
 121
 122 #ifndef CONFIG_64BIT
 123 struct sel_arg_struct {
 124         unsigned long n;
 125         fd_set __user *inp, *outp, *exp;
 126         struct timeval __user *tvp;
 127 };
 128
 129 asmlinkage long old_select(struct sel_arg_struct __user *arg)
 130 {
 131         struct sel_arg_struct a;
 132
 133         if (copy_from_user(&a, arg, sizeof(a)))
 134                 return -EFAULT;
 135         /* sys_select() does the appropriate kernel locking */
 136         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 137
 138 }
 139 #endif /* CONFIG_64BIT */
 140
 141 /*
 142  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 143  *
 144  * This is really horribly ugly.
 145  */
 146 asmlinkage long sys_ipc(uint call, int first, unsigned long second,
 147                                   unsigned long third, void __user *ptr)
 148 {
 149         struct ipc_kludge tmp;
 150         int ret;
 151
 152         switch (call) {
 153         case SEMOP:
 154                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 155                                        (unsigned)second, NULL);
 156         case SEMTIMEDOP:
 157                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 158                                        (unsigned)second,
 159                                        (const struct timespec __user *) third);
 160         case SEMGET:
 161                 return sys_semget(first, (int)second, third);
 162         case SEMCTL: {
 163                 union semun fourth;
 164                 if (!ptr)
 165                         return -EINVAL;
 166                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 167                         return -EFAULT;
 168                 return sys_semctl(first, (int)second, third, fourth);
 169         }
 170         case MSGSND:
 171                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 172                                    (size_t)second, third);
 173                 break;
 174         case MSGRCV:
 175                 if (!ptr)
 176                         return -EINVAL;
 177                 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
 178                                     sizeof (struct ipc_kludge)))
 179                         return -EFAULT;
 180                 return sys_msgrcv (first, tmp.msgp,
 181                                    (size_t)second, tmp.msgtyp, third);
 182         case MSGGET:
 183                 return sys_msgget((key_t)first, (int)second);
 184         case MSGCTL:
 185                 return sys_msgctl(first, (int)second,
 186                                    (struct msqid_ds __user *)ptr);
 187
 188         case SHMAT: {
 189                 ulong raddr;
 190                 ret = do_shmat(first, (char __user *)ptr,
 191                                 (int)second, &raddr);
 192                 if (ret)
 193                         return ret;
 194                 return put_user (raddr, (ulong __user *) third);
 195                 break;
 196         }
 197         case SHMDT:
 198                 return sys_shmdt ((char __user *)ptr);
 199         case SHMGET:
 200                 return sys_shmget(first, (size_t)second, third);
 201         case SHMCTL:
 202                 return sys_shmctl(first, (int)second,
 203                                    (struct shmid_ds __user *) ptr);
 204         default:
 205                 return -ENOSYS;
 206
 207         }
 208
 209         return -EINVAL;
 210 }
 211
 212 #ifdef CONFIG_64BIT
 213 asmlinkage long s390x_newuname(struct new_utsname __user *name)
 214 {
 215         int ret = sys_newuname(name);
 216
 217         if (current->personality == PER_LINUX32 && !ret) {
 218                 ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
 219                 if (ret) ret = -EFAULT;
 220         }
 221         return ret;
 222 }
 223
 224 asmlinkage long s390x_personality(unsigned long personality)
 225 {
 226         int ret;
 227
 228         if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 229                 personality = PER_LINUX32;
 230         ret = sys_personality(personality);
 231         if (ret == PER_LINUX32)
 232                 ret = PER_LINUX;
 233
 234         return ret;
 235 }
 236 #endif /* CONFIG_64BIT */
 237
 238 /*
 239  * Wrapper function for sys_fadvise64/fadvise64_64
 240  */
 241 #ifndef CONFIG_64BIT
 242
 243 asmlinkage long
 244 s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
 245 {
 246         return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 247                         len, advice);
 248 }
 249
 250 #endif
 251
 252 struct fadvise64_64_args {
 253         int fd;
 254         long long offset;
 255         long long len;
 256         int advice;
 257 };
 258
 259 asmlinkage long
 260 s390_fadvise64_64(struct fadvise64_64_args __user *args)
 261 {
 262         struct fadvise64_64_args a;
 263
 264         if ( copy_from_user(&a, args, sizeof(a)) )
 265                 return -EFAULT;
 266         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 267 }