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 SYSCALL_DEFINE1(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 SYSCALL_DEFINE1(s390_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 /*
 107  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 108  *
 109  * This is really horribly ugly.
 110  */
 111 SYSCALL_DEFINE5(ipc, uint, call, int, first, unsigned long, second,
 112                 unsigned long, third, void __user *, ptr)
 113 {
 114         struct ipc_kludge tmp;
 115         int ret;
 116
 117         switch (call) {
 118         case SEMOP:
 119                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 120                                        (unsigned)second, NULL);
 121         case SEMTIMEDOP:
 122                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 123                                        (unsigned)second,
 124                                        (const struct timespec __user *) third);
 125         case SEMGET:
 126                 return sys_semget(first, (int)second, third);
 127         case SEMCTL: {
 128                 union semun fourth;
 129                 if (!ptr)
 130                         return -EINVAL;
 131                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 132                         return -EFAULT;
 133                 return sys_semctl(first, (int)second, third, fourth);
 134         }
 135         case MSGSND:
 136                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 137                                    (size_t)second, third);
 138                 break;
 139         case MSGRCV:
 140                 if (!ptr)
 141                         return -EINVAL;
 142                 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
 143                                     sizeof (struct ipc_kludge)))
 144                         return -EFAULT;
 145                 return sys_msgrcv (first, tmp.msgp,
 146                                    (size_t)second, tmp.msgtyp, third);
 147         case MSGGET:
 148                 return sys_msgget((key_t)first, (int)second);
 149         case MSGCTL:
 150                 return sys_msgctl(first, (int)second,
 151                                    (struct msqid_ds __user *)ptr);
 152
 153         case SHMAT: {
 154                 ulong raddr;
 155                 ret = do_shmat(first, (char __user *)ptr,
 156                                 (int)second, &raddr);
 157                 if (ret)
 158                         return ret;
 159                 return put_user (raddr, (ulong __user *) third);
 160                 break;
 161         }
 162         case SHMDT:
 163                 return sys_shmdt ((char __user *)ptr);
 164         case SHMGET:
 165                 return sys_shmget(first, (size_t)second, third);
 166         case SHMCTL:
 167                 return sys_shmctl(first, (int)second,
 168                                    (struct shmid_ds __user *) ptr);
 169         default:
 170                 return -ENOSYS;
 171
 172         }
 173
 174         return -EINVAL;
 175 }
 176
 177 #ifdef CONFIG_64BIT
 178 SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name)
 179 {
 180         int ret = sys_newuname(name);
 181
 182         if (personality(current->personality) == PER_LINUX32 && !ret) {
 183                 ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
 184                 if (ret) ret = -EFAULT;
 185         }
 186         return ret;
 187 }
 188
 189 SYSCALL_DEFINE1(s390_personality, unsigned long, personality)
 190 {
 191         int ret;
 192
 193         if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 194                 personality = PER_LINUX32;
 195         ret = sys_personality(personality);
 196         if (ret == PER_LINUX32)
 197                 ret = PER_LINUX;
 198
 199         return ret;
 200 }
 201 #endif /* CONFIG_64BIT */
 202
 203 /*
 204  * Wrapper function for sys_fadvise64/fadvise64_64
 205  */
 206 #ifndef CONFIG_64BIT
 207
 208 SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
 209                 size_t, len, int, advice)
 210 {
 211         return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 212                         len, advice);
 213 }
 214
 215 struct fadvise64_64_args {
 216         int fd;
 217         long long offset;
 218         long long len;
 219         int advice;
 220 };
 221
 222 SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
 223 {
 224         struct fadvise64_64_args a;
 225
 226         if ( copy_from_user(&a, args, sizeof(a)) )
 227                 return -EFAULT;
 228         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 229 }
 230
 231 /*
 232  * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
 233  * 64 bit argument "len" is split into the upper and lower 32 bits. The
 234  * system call wrapper in the user space loads the value to %r6/%r7.
 235  * The code in entry.S keeps the values in %r2 - %r6 where they are and
 236  * stores %r7 to 96(%r15). But the standard C linkage requires that
 237  * the whole 64 bit value for len is stored on the stack and doesn't
 238  * use %r6 at all. So s390_fallocate has to convert the arguments from
 239  *   %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
 240  * to
 241  *   %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
 242  */
 243 SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
 244                                u32 len_high, u32 len_low)
 245 {
 246         return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
 247 }
 248 #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
 249 asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
 250                                    long len_high, long len_low)
 251 {
 252         return SYSC_s390_fallocate((int) fd, (int) mode, offset,
 253                                    (u32) len_high, (u32) len_low);
 254 }
 255 SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
 256 #endif
 257
 258 #endif