release/src-rt-6.x.4708/linux/linux-2.6.36/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 mmap() system call. Linux for S/390 isn't able to handle more
  37  * than 5 system call parameters, so this system call uses a memory block
  38  * for parameter passing.
  39  */
  40
  41 struct s390_mmap_arg_struct {
  42         unsigned long addr;
  43         unsigned long len;
  44         unsigned long prot;
  45         unsigned long flags;
  46         unsigned long fd;
  47         unsigned long offset;
  48 };
  49
  50 SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
  51 {
  52         struct s390_mmap_arg_struct a;
  53         int error = -EFAULT;
  54
  55         if (copy_from_user(&a, arg, sizeof(a)))
  56                 goto out;
  57         error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
  58 out:
  59         return error;
  60 }
  61
  62 /*
  63  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  64  *
  65  * This is really horribly ugly.
  66  */
  67 SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
  68                 unsigned long, third, void __user *, ptr)
  69 {
  70         struct ipc_kludge tmp;
  71         int ret;
  72
  73         switch (call) {
  74         case SEMOP:
  75                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
  76                                        (unsigned)second, NULL);
  77         case SEMTIMEDOP:
  78                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
  79                                        (unsigned)second,
  80                                        (const struct timespec __user *) third);
  81         case SEMGET:
  82                 return sys_semget(first, (int)second, third);
  83         case SEMCTL: {
  84                 union semun fourth;
  85                 if (!ptr)
  86                         return -EINVAL;
  87                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
  88                         return -EFAULT;
  89                 return sys_semctl(first, (int)second, third, fourth);
  90         }
  91         case MSGSND:
  92                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
  93                                    (size_t)second, third);
  94                 break;
  95         case MSGRCV:
  96                 if (!ptr)
  97                         return -EINVAL;
  98                 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
  99                                     sizeof (struct ipc_kludge)))
 100                         return -EFAULT;
 101                 return sys_msgrcv (first, tmp.msgp,
 102                                    (size_t)second, tmp.msgtyp, third);
 103         case MSGGET:
 104                 return sys_msgget((key_t)first, (int)second);
 105         case MSGCTL:
 106                 return sys_msgctl(first, (int)second,
 107                                    (struct msqid_ds __user *)ptr);
 108
 109         case SHMAT: {
 110                 ulong raddr;
 111                 ret = do_shmat(first, (char __user *)ptr,
 112                                 (int)second, &raddr);
 113                 if (ret)
 114                         return ret;
 115                 return put_user (raddr, (ulong __user *) third);
 116                 break;
 117         }
 118         case SHMDT:
 119                 return sys_shmdt ((char __user *)ptr);
 120         case SHMGET:
 121                 return sys_shmget(first, (size_t)second, third);
 122         case SHMCTL:
 123                 return sys_shmctl(first, (int)second,
 124                                    (struct shmid_ds __user *) ptr);
 125         default:
 126                 return -ENOSYS;
 127
 128         }
 129
 130         return -EINVAL;
 131 }
 132
 133 #ifdef CONFIG_64BIT
 134 SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
 135 {
 136         unsigned int ret;
 137
 138         if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 139                 personality = PER_LINUX32;
 140         ret = sys_personality(personality);
 141         if (ret == PER_LINUX32)
 142                 ret = PER_LINUX;
 143
 144         return ret;
 145 }
 146 #endif /* CONFIG_64BIT */
 147
 148 /*
 149  * Wrapper function for sys_fadvise64/fadvise64_64
 150  */
 151 #ifndef CONFIG_64BIT
 152
 153 SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
 154                 size_t, len, int, advice)
 155 {
 156         return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 157                         len, advice);
 158 }
 159
 160 struct fadvise64_64_args {
 161         int fd;
 162         long long offset;
 163         long long len;
 164         int advice;
 165 };
 166
 167 SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
 168 {
 169         struct fadvise64_64_args a;
 170
 171         if ( copy_from_user(&a, args, sizeof(a)) )
 172                 return -EFAULT;
 173         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 174 }
 175
 176 /*
 177  * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
 178  * 64 bit argument "len" is split into the upper and lower 32 bits. The
 179  * system call wrapper in the user space loads the value to %r6/%r7.
 180  * The code in entry.S keeps the values in %r2 - %r6 where they are and
 181  * stores %r7 to 96(%r15). But the standard C linkage requires that
 182  * the whole 64 bit value for len is stored on the stack and doesn't
 183  * use %r6 at all. So s390_fallocate has to convert the arguments from
 184  *   %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
 185  * to
 186  *   %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
 187  */
 188 SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
 189                                u32 len_high, u32 len_low)
 190 {
 191         return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
 192 }
 193 #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
 194 asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
 195                                    long len_high, long len_low)
 196 {
 197         return SYSC_s390_fallocate((int) fd, (int) mode, offset,
 198                                    (u32) len_high, (u32) len_low);
 199 }
 200 SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
 201 #endif
 202
 203 #endif