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 <linux/syscalls.h>
  33 #include <asm/uaccess.h>
  34 #include "entry.h"
  35
  36 /* common code for old and new mmaps */
  37 static inline long do_mmap2(
  38         unsigned long addr, unsigned long len,
  39         unsigned long prot, unsigned long flags,
  40         unsigned long fd, unsigned long pgoff)
  41 {
  42         long error = -EBADF;
  43         struct file * file = NULL;
  44
  45         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  46         if (!(flags & MAP_ANONYMOUS)) {
  47                 file = fget(fd);
  48                 if (!file)
  49                         goto out;
  50         }
  51
  52         down_write(&current->mm->mmap_sem);
  53         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  54         up_write(&current->mm->mmap_sem);
  55
  56         if (file)
  57                 fput(file);
  58 out:
  59         return error;
  60 }
  61
  62 /*
  63  * Perform the select(nd, in, out, ex, tv) and mmap() system
  64  * calls. Linux for S/390 isn't able to handle more than 5
  65  * system call parameters, so these system calls used a memory
  66  * block for parameter passing..
  67  */
  68
  69 struct mmap_arg_struct {
  70         unsigned long addr;
  71         unsigned long len;
  72         unsigned long prot;
  73         unsigned long flags;
  74         unsigned long fd;
  75         unsigned long offset;
  76 };
  77
  78 SYSCALL_DEFINE1(mmap2, struct mmap_arg_struct __user *, arg)
  79 {
  80         struct mmap_arg_struct a;
  81         int error = -EFAULT;
  82
  83         if (copy_from_user(&a, arg, sizeof(a)))
  84                 goto out;
  85         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
  86 out:
  87         return error;
  88 }
  89
  90 SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct __user *, arg)
  91 {
  92         struct mmap_arg_struct a;
  93         long error = -EFAULT;
  94
  95         if (copy_from_user(&a, arg, sizeof(a)))
  96                 goto out;
  97
  98         error = -EINVAL;
  99         if (a.offset & ~PAGE_MASK)
 100                 goto out;
 101
 102         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 103 out:
 104         return error;
 105 }
 106
 107 /*
 108  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 109  *
 110  * This is really horribly ugly.
 111  */
 112 SYSCALL_DEFINE5(ipc, uint, call, int, first, unsigned long, second,
 113                 unsigned long, third, void __user *, ptr)
 114 {
 115         struct ipc_kludge tmp;
 116         int ret;
 117
 118         switch (call) {
 119         case SEMOP:
 120                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 121                                        (unsigned)second, NULL);
 122         case SEMTIMEDOP:
 123                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 124                                        (unsigned)second,
 125                                        (const struct timespec __user *) third);
 126         case SEMGET:
 127                 return sys_semget(first, (int)second, third);
 128         case SEMCTL: {
 129                 union semun fourth;
 130                 if (!ptr)
 131                         return -EINVAL;
 132                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 133                         return -EFAULT;
 134                 return sys_semctl(first, (int)second, third, fourth);
 135         }
 136         case MSGSND:
 137                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 138                                    (size_t)second, third);
 139                 break;
 140         case MSGRCV:
 141                 if (!ptr)
 142                         return -EINVAL;
 143                 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
 144                                     sizeof (struct ipc_kludge)))
 145                         return -EFAULT;
 146                 return sys_msgrcv (first, tmp.msgp,
 147                                    (size_t)second, tmp.msgtyp, third);
 148         case MSGGET:
 149                 return sys_msgget((key_t)first, (int)second);
 150         case MSGCTL:
 151                 return sys_msgctl(first, (int)second,
 152                                    (struct msqid_ds __user *)ptr);
 153
 154         case SHMAT: {
 155                 ulong raddr;
 156                 ret = do_shmat(first, (char __user *)ptr,
 157                                 (int)second, &raddr);
 158                 if (ret)
 159                         return ret;
 160                 return put_user (raddr, (ulong __user *) third);
 161                 break;
 162         }
 163         case SHMDT:
 164                 return sys_shmdt ((char __user *)ptr);
 165         case SHMGET:
 166                 return sys_shmget(first, (size_t)second, third);
 167         case SHMCTL:
 168                 return sys_shmctl(first, (int)second,
 169                                    (struct shmid_ds __user *) ptr);
 170         default:
 171                 return -ENOSYS;
 172
 173         }
 174
 175         return -EINVAL;
 176 }
 177
 178 #ifdef CONFIG_64BIT
 179 SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name)
 180 {
 181         int ret = sys_newuname(name);
 182
 183         if (personality(current->personality) == PER_LINUX32 && !ret) {
 184                 ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
 185                 if (ret) ret = -EFAULT;
 186         }
 187         return ret;
 188 }
 189
 190 SYSCALL_DEFINE1(s390_personality, unsigned long, personality)
 191 {
 192         int ret;
 193
 194         if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 195                 personality = PER_LINUX32;
 196         ret = sys_personality(personality);
 197         if (ret == PER_LINUX32)
 198                 ret = PER_LINUX;
 199
 200         return ret;
 201 }
 202 #endif /* CONFIG_64BIT */
 203
 204 /*
 205  * Wrapper function for sys_fadvise64/fadvise64_64
 206  */
 207 #ifndef CONFIG_64BIT
 208
 209 SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
 210                 size_t, len, int, advice)
 211 {
 212         return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 213                         len, advice);
 214 }
 215
 216 struct fadvise64_64_args {
 217         int fd;
 218         long long offset;
 219         long long len;
 220         int advice;
 221 };
 222
 223 SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
 224 {
 225         struct fadvise64_64_args a;
 226
 227         if ( copy_from_user(&a, args, sizeof(a)) )
 228                 return -EFAULT;
 229         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 230 }
 231
 232 /*
 233  * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
 234  * 64 bit argument "len" is split into the upper and lower 32 bits. The
 235  * system call wrapper in the user space loads the value to %r6/%r7.
 236  * The code in entry.S keeps the values in %r2 - %r6 where they are and
 237  * stores %r7 to 96(%r15). But the standard C linkage requires that
 238  * the whole 64 bit value for len is stored on the stack and doesn't
 239  * use %r6 at all. So s390_fallocate has to convert the arguments from
 240  *   %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
 241  * to
 242  *   %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
 243  */
 244 SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
 245                                u32 len_high, u32 len_low)
 246 {
 247         return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
 248 }
 249 #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
 250 asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
 251                                    long len_high, long len_low)
 252 {
 253         return SYSC_s390_fallocate((int) fd, (int) mode, offset,
 254                                    (u32) len_high, (u32) len_low);
 255 }
 256 SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
 257 #endif
 258
 259 #endif