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