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/smp_lock.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 #ifdef CONFIG_ARCH_S390X
  30 #include <linux/personality.h>
  31 #endif /* CONFIG_ARCH_S390X */
  32
  33 #include <asm/uaccess.h>
  34 #include <asm/ipc.h>
  35
  36 /*
  37  * sys_pipe() is the normal C calling standard for creating
  38  * a pipe. It's not the way Unix traditionally does this, though.
  39  */
  40 asmlinkage long sys_pipe(unsigned long __user *fildes)
  41 {
  42         int fd[2];
  43         int error;
  44
  45         error = do_pipe(fd);
  46         if (!error) {
  47                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  48                         error = -EFAULT;
  49         }
  50         return error;
  51 }
  52
  53 /* common code for old and new mmaps */
  54 static inline long do_mmap2(
  55         unsigned long addr, unsigned long len,
  56         unsigned long prot, unsigned long flags,
  57         unsigned long fd, unsigned long pgoff)
  58 {
  59         long error = -EBADF;
  60         struct file * file = NULL;
  61
  62         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  63         if (!(flags & MAP_ANONYMOUS)) {
  64                 file = fget(fd);
  65                 if (!file)
  66                         goto out;
  67         }
  68
  69         down_write(&current->mm->mmap_sem);
  70         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  71         up_write(&current->mm->mmap_sem);
  72
  73         if (file)
  74                 fput(file);
  75 out:
  76         return error;
  77 }
  78
  79 /*
  80  * Perform the select(nd, in, out, ex, tv) and mmap() system
  81  * calls. Linux for S/390 isn't able to handle more than 5
  82  * system call parameters, so these system calls used a memory
  83  * block for parameter passing..
  84  */
  85
  86 struct mmap_arg_struct {
  87         unsigned long addr;
  88         unsigned long len;
  89         unsigned long prot;
  90         unsigned long flags;
  91         unsigned long fd;
  92         unsigned long offset;
  93 };
  94
  95 asmlinkage long sys_mmap2(struct mmap_arg_struct __user  *arg)
  96 {
  97         struct mmap_arg_struct a;
  98         int error = -EFAULT;
  99
 100         if (copy_from_user(&a, arg, sizeof(a)))
 101                 goto out;
 102         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 103 out:
 104         return error;
 105 }
 106
 107 asmlinkage long old_mmap(struct mmap_arg_struct __user *arg)
 108 {
 109         struct mmap_arg_struct a;
 110         long error = -EFAULT;
 111
 112         if (copy_from_user(&a, arg, sizeof(a)))
 113                 goto out;
 114
 115         error = -EINVAL;
 116         if (a.offset & ~PAGE_MASK)
 117                 goto out;
 118
 119         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 120 out:
 121         return error;
 122 }
 123
 124 #ifndef CONFIG_ARCH_S390X
 125 struct sel_arg_struct {
 126         unsigned long n;
 127         fd_set *inp, *outp, *exp;
 128         struct timeval *tvp;
 129 };
 130
 131 asmlinkage long old_select(struct sel_arg_struct __user *arg)
 132 {
 133         struct sel_arg_struct a;
 134
 135         if (copy_from_user(&a, arg, sizeof(a)))
 136                 return -EFAULT;
 137         /* sys_select() does the appropriate kernel locking */
 138         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 139
 140 }
 141 #endif /* CONFIG_ARCH_S390X */
 142
 143 /*
 144  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 145  *
 146  * This is really horribly ugly.
 147  */
 148 asmlinkage long sys_ipc(uint call, int first, unsigned long second,
 149                                   unsigned long third, void __user *ptr)
 150 {
 151         struct ipc_kludge tmp;
 152         int ret;
 153
 154         switch (call) {
 155         case SEMOP:
 156                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 157                                        (unsigned)second, NULL);
 158         case SEMTIMEDOP:
 159                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 160                                        (unsigned)second,
 161                                        (const struct timespec __user *) third);
 162         case SEMGET:
 163                 return sys_semget(first, (int)second, third);
 164         case SEMCTL: {
 165                 union semun fourth;
 166                 if (!ptr)
 167                         return -EINVAL;
 168                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 169                         return -EFAULT;
 170                 return sys_semctl(first, (int)second, third, fourth);
 171         }
 172         case MSGSND:
 173                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 174                                    (size_t)second, third);
 175                 break;
 176         case MSGRCV:
 177                 if (!ptr)
 178                         return -EINVAL;
 179                 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
 180                                     sizeof (struct ipc_kludge)))
 181                         return -EFAULT;
 182                 return sys_msgrcv (first, tmp.msgp,
 183                                    (size_t)second, tmp.msgtyp, third);
 184         case MSGGET:
 185                 return sys_msgget((key_t)first, (int)second);
 186         case MSGCTL:
 187                 return sys_msgctl(first, (int)second,
 188                                    (struct msqid_ds __user *)ptr);
 189
 190         case SHMAT: {
 191                 ulong raddr;
 192                 ret = do_shmat(first, (char __user *)ptr,
 193                                 (int)second, &raddr);
 194                 if (ret)
 195                         return ret;
 196                 return put_user (raddr, (ulong __user *) third);
 197                 break;
 198         }
 199         case SHMDT:
 200                 return sys_shmdt ((char __user *)ptr);
 201         case SHMGET:
 202                 return sys_shmget(first, (size_t)second, third);
 203         case SHMCTL:
 204                 return sys_shmctl(first, (int)second,
 205                                    (struct shmid_ds __user *) ptr);
 206         default:
 207                 return -ENOSYS;
 208
 209         }
 210
 211         return -EINVAL;
 212 }
 213
 214 #ifdef CONFIG_ARCH_S390X
 215 asmlinkage long s390x_newuname(struct new_utsname __user *name)
 216 {
 217         int ret = sys_newuname(name);
 218
 219         if (current->personality == PER_LINUX32 && !ret) {
 220                 ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
 221                 if (ret) ret = -EFAULT;
 222         }
 223         return ret;
 224 }
 225
 226 asmlinkage long s390x_personality(unsigned long personality)
 227 {
 228         int ret;
 229
 230         if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 231                 personality = PER_LINUX32;
 232         ret = sys_personality(personality);
 233         if (ret == PER_LINUX32)
 234                 ret = PER_LINUX;
 235
 236         return ret;
 237 }
 238 #endif /* CONFIG_ARCH_S390X */
 239
 240 /*
 241  * Wrapper function for sys_fadvise64/fadvise64_64
 242  */
 243 #ifndef CONFIG_ARCH_S390X
 244
 245 asmlinkage long
 246 s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
 247 {
 248         return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 249                         len, advice);
 250 }
 251
 252 #endif
 253
 254 struct fadvise64_64_args {
 255         int fd;
 256         long long offset;
 257         long long len;
 258         int advice;
 259 };
 260
 261 asmlinkage long
 262 s390_fadvise64_64(struct fadvise64_64_args __user *args)
 263 {
 264         struct fadvise64_64_args a;
 265
 266         if ( copy_from_user(&a, args, sizeof(a)) )
 267                 return -EFAULT;
 268         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 269 }
 270