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/fs.h>
  20 #include <linux/smp.h>
  21 #include <linux/sem.h>
  22 #include <linux/msg.h>
  23 #include <linux/shm.h>
  24 #include <linux/stat.h>
  25 #include <linux/syscalls.h>
  26 #include <linux/mman.h>
  27 #include <linux/file.h>
  28 #include <linux/utsname.h>
  29 #include <linux/personality.h>
  30 #include <linux/unistd.h>
  31
  32 #include <asm/uaccess.h>
  33 #include <asm/ipc.h>
  34
  35 /*
  36  * sys_pipe() is the normal C calling standard for creating
  37  * a pipe. It's not the way Unix traditionally does this, though.
  38  */
  39 asmlinkage long sys_pipe(unsigned long __user *fildes)
  40 {
  41         int fd[2];
  42         int error;
  43
  44         error = do_pipe(fd);
  45         if (!error) {
  46                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  47                         error = -EFAULT;
  48         }
  49         return error;
  50 }
  51
  52 /* common code for old and new mmaps */
  53 static inline long do_mmap2(
  54         unsigned long addr, unsigned long len,
  55         unsigned long prot, unsigned long flags,
  56         unsigned long fd, unsigned long pgoff)
  57 {
  58         long error = -EBADF;
  59         struct file * file = NULL;
  60
  61         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  62         if (!(flags & MAP_ANONYMOUS)) {
  63                 file = fget(fd);
  64                 if (!file)
  65                         goto out;
  66         }
  67
  68         down_write(&current->mm->mmap_sem);
  69         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  70         up_write(&current->mm->mmap_sem);
  71
  72         if (file)
  73                 fput(file);
  74 out:
  75         return error;
  76 }
  77
  78 /*
  79  * Perform the select(nd, in, out, ex, tv) and mmap() system
  80  * calls. Linux for S/390 isn't able to handle more than 5
  81  * system call parameters, so these system calls used a memory
  82  * block for parameter passing..
  83  */
  84
  85 struct mmap_arg_struct {
  86         unsigned long addr;
  87         unsigned long len;
  88         unsigned long prot;
  89         unsigned long flags;
  90         unsigned long fd;
  91         unsigned long offset;
  92 };
  93
  94 asmlinkage long sys_mmap2(struct mmap_arg_struct __user  *arg)
  95 {
  96         struct mmap_arg_struct a;
  97         int error = -EFAULT;
  98
  99         if (copy_from_user(&a, arg, sizeof(a)))
 100                 goto out;
 101         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 102 out:
 103         return error;
 104 }
 105
 106 asmlinkage long old_mmap(struct mmap_arg_struct __user *arg)
 107 {
 108         struct mmap_arg_struct a;
 109         long error = -EFAULT;
 110
 111         if (copy_from_user(&a, arg, sizeof(a)))
 112                 goto out;
 113
 114         error = -EINVAL;
 115         if (a.offset & ~PAGE_MASK)
 116                 goto out;
 117
 118         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 119 out:
 120         return error;
 121 }
 122
 123 #ifndef CONFIG_64BIT
 124 struct sel_arg_struct {
 125         unsigned long n;
 126         fd_set __user *inp, *outp, *exp;
 127         struct timeval __user *tvp;
 128 };
 129
 130 asmlinkage long old_select(struct sel_arg_struct __user *arg)
 131 {
 132         struct sel_arg_struct a;
 133
 134         if (copy_from_user(&a, arg, sizeof(a)))
 135                 return -EFAULT;
 136         /* sys_select() does the appropriate kernel locking */
 137         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 138
 139 }
 140 #endif /* CONFIG_64BIT */
 141
 142 /*
 143  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 144  *
 145  * This is really horribly ugly.
 146  */
 147 asmlinkage long sys_ipc(uint call, int first, unsigned long second,
 148                                   unsigned long third, void __user *ptr)
 149 {
 150         struct ipc_kludge tmp;
 151         int ret;
 152
 153         switch (call) {
 154         case SEMOP:
 155                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 156                                        (unsigned)second, NULL);
 157         case SEMTIMEDOP:
 158                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 159                                        (unsigned)second,
 160                                        (const struct timespec __user *) third);
 161         case SEMGET:
 162                 return sys_semget(first, (int)second, third);
 163         case SEMCTL: {
 164                 union semun fourth;
 165                 if (!ptr)
 166                         return -EINVAL;
 167                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 168                         return -EFAULT;
 169                 return sys_semctl(first, (int)second, third, fourth);
 170         }
 171         case MSGSND:
 172                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 173                                    (size_t)second, third);
 174                 break;
 175         case MSGRCV:
 176                 if (!ptr)
 177                         return -EINVAL;
 178                 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
 179                                     sizeof (struct ipc_kludge)))
 180                         return -EFAULT;
 181                 return sys_msgrcv (first, tmp.msgp,
 182                                    (size_t)second, tmp.msgtyp, third);
 183         case MSGGET:
 184                 return sys_msgget((key_t)first, (int)second);
 185         case MSGCTL:
 186                 return sys_msgctl(first, (int)second,
 187                                    (struct msqid_ds __user *)ptr);
 188
 189         case SHMAT: {
 190                 ulong raddr;
 191                 ret = do_shmat(first, (char __user *)ptr,
 192                                 (int)second, &raddr);
 193                 if (ret)
 194                         return ret;
 195                 return put_user (raddr, (ulong __user *) third);
 196                 break;
 197         }
 198         case SHMDT:
 199                 return sys_shmdt ((char __user *)ptr);
 200         case SHMGET:
 201                 return sys_shmget(first, (size_t)second, third);
 202         case SHMCTL:
 203                 return sys_shmctl(first, (int)second,
 204                                    (struct shmid_ds __user *) ptr);
 205         default:
 206                 return -ENOSYS;
 207
 208         }
 209
 210         return -EINVAL;
 211 }
 212
 213 #ifdef CONFIG_64BIT
 214 asmlinkage long s390x_newuname(struct new_utsname __user *name)
 215 {
 216         int ret = sys_newuname(name);
 217
 218         if (current->personality == PER_LINUX32 && !ret) {
 219                 ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
 220                 if (ret) ret = -EFAULT;
 221         }
 222         return ret;
 223 }
 224
 225 asmlinkage long s390x_personality(unsigned long personality)
 226 {
 227         int ret;
 228
 229         if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 230                 personality = PER_LINUX32;
 231         ret = sys_personality(personality);
 232         if (ret == PER_LINUX32)
 233                 ret = PER_LINUX;
 234
 235         return ret;
 236 }
 237 #endif /* CONFIG_64BIT */
 238
 239 /*
 240  * Wrapper function for sys_fadvise64/fadvise64_64
 241  */
 242 #ifndef CONFIG_64BIT
 243
 244 asmlinkage long
 245 s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
 246 {
 247         return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 248                         len, advice);
 249 }
 250
 251 #endif
 252
 253 struct fadvise64_64_args {
 254         int fd;
 255         long long offset;
 256         long long len;
 257         int advice;
 258 };
 259
 260 asmlinkage long
 261 s390_fadvise64_64(struct fadvise64_64_args __user *args)
 262 {
 263         struct fadvise64_64_args a;
 264
 265         if ( copy_from_user(&a, args, sizeof(a)) )
 266                 return -EFAULT;
 267         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 268 }
 269
 270 #ifndef CONFIG_64BIT
 271 /*
 272  * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
 273  * 64 bit argument "len" is split into the upper and lower 32 bits. The
 274  * system call wrapper in the user space loads the value to %r6/%r7.
 275  * The code in entry.S keeps the values in %r2 - %r6 where they are and
 276  * stores %r7 to 96(%r15). But the standard C linkage requires that
 277  * the whole 64 bit value for len is stored on the stack and doesn't
 278  * use %r6 at all. So s390_fallocate has to convert the arguments from
 279  *   %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
 280  * to
 281  *   %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
 282  */
 283 asmlinkage long s390_fallocate(int fd, int mode, loff_t offset,
 284                                u32 len_high, u32 len_low)
 285 {
 286         return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
 287 }
 288 #endif