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