LXR linux/arch/s390/kernel/sys

   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 */
  37static 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);
  58out:
  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
  69struct 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
  78SYSCALL_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);
  86out:
  87        return error;
  88}
  89
  90SYSCALL_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);
 103out:
 104        return error;
 105}
 106
 107#ifndef CONFIG_64BIT
 108struct sel_arg_struct {
 109        unsigned long n;
 110        fd_set __user *inp, *outp, *exp;
 111        struct timeval __user *tvp;
 112};
 113
 114asmlinkage long old_select(struct sel_arg_struct __user *arg)
 115{
 116        struct sel_arg_struct a;
 117
 118        if (copy_from_user(&a, arg, sizeof(a)))
 119                return -EFAULT;
 120        /* sys_select() does the appropriate kernel locking */
 121        return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 122
 123}
 124#endif /* CONFIG_64BIT */
 125
 126/*
 127 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 128 *
 129 * This is really horribly ugly.
 130 */
 131SYSCALL_DEFINE5(ipc, uint, call, int, first, unsigned long, second,
 132                unsigned long, third, void __user *, ptr)
 133{
 134        struct ipc_kludge tmp;
 135        int ret;
 136
 137        switch (call) {
 138        case SEMOP:
 139                return sys_semtimedop(first, (struct sembuf __user *)ptr,
 140                                       (unsigned)second, NULL);
 141        case SEMTIMEDOP:
 142                return sys_semtimedop(first, (struct sembuf __user *)ptr,
 143                                       (unsigned)second,
 144                                       (const struct timespec __user *) third);
 145        case SEMGET:
 146                return sys_semget(first, (int)second, third);
 147        case SEMCTL: {
 148                union semun fourth;
 149                if (!ptr)
 150                        return -EINVAL;
 151                if (get_user(fourth.__pad, (void __user * __user *) ptr))
 152                        return -EFAULT;
 153                return sys_semctl(first, (int)second, third, fourth);
 154        }
 155        case MSGSND:
 156                return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 157                                   (size_t)second, third);
 158                break;
 159        case MSGRCV:
 160                if (!ptr)
 161                        return -EINVAL;
 162                if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
 163                                    sizeof (struct ipc_kludge)))
 164                        return -EFAULT;
 165                return sys_msgrcv (first, tmp.msgp,
 166                                   (size_t)second, tmp.msgtyp, third);
 167        case MSGGET:
 168                return sys_msgget((key_t)first, (int)second);
 169        case MSGCTL:
 170                return sys_msgctl(first, (int)second,
 171                                   (struct msqid_ds __user *)ptr);
 172
 173        case SHMAT: {
 174                ulong raddr;
 175                ret = do_shmat(first, (char __user *)ptr,
 176                                (int)second, &raddr);
 177                if (ret)
 178                        return ret;
 179                return put_user (raddr, (ulong __user *) third);
 180                break;
 181        }
 182        case SHMDT:
 183                return sys_shmdt ((char __user *)ptr);
 184        case SHMGET:
 185                return sys_shmget(first, (size_t)second, third);
 186        case SHMCTL:
 187                return sys_shmctl(first, (int)second,
 188                                   (struct shmid_ds __user *) ptr);
 189        default:
 190                return -ENOSYS;
 191
 192        }
 193
 194        return -EINVAL;
 195}
 196
 197#ifdef CONFIG_64BIT
 198SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name)
 199{
 200        int ret = sys_newuname(name);
 201
 202        if (personality(current->personality) == PER_LINUX32 && !ret) {
 203                ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
 204                if (ret) ret = -EFAULT;
 205        }
 206        return ret;
 207}
 208
 209SYSCALL_DEFINE1(s390_personality, unsigned long, personality)
 210{
 211        int ret;
 212
 213        if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 214                personality = PER_LINUX32;
 215        ret = sys_personality(personality);
 216        if (ret == PER_LINUX32)
 217                ret = PER_LINUX;
 218
 219        return ret;
 220}
 221#endif /* CONFIG_64BIT */
 222
 223/*
 224 * Wrapper function for sys_fadvise64/fadvise64_64
 225 */
 226#ifndef CONFIG_64BIT
 227
 228SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
 229                size_t, len, int, advice)
 230{
 231        return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 232                        len, advice);
 233}
 234
 235struct fadvise64_64_args {
 236        int fd;
 237        long long offset;
 238        long long len;
 239        int advice;
 240};
 241
 242SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
 243{
 244        struct fadvise64_64_args a;
 245
 246        if ( copy_from_user(&a, args, sizeof(a)) )
 247                return -EFAULT;
 248        return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 249}
 250
 251/*
 252 * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
 253 * 64 bit argument "len" is split into the upper and lower 32 bits. The
 254 * system call wrapper in the user space loads the value to %r6/%r7.
 255 * The code in entry.S keeps the values in %r2 - %r6 where they are and
 256 * stores %r7 to 96(%r15). But the standard C linkage requires that
 257 * the whole 64 bit value for len is stored on the stack and doesn't
 258 * use %r6 at all. So s390_fallocate has to convert the arguments from
 259 *   %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
 260 * to
 261 *   %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
 262 */
 263SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
 264                               u32 len_high, u32 len_low)
 265{
 266        return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
 267}
 268#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
 269asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
 270                                   long len_high, long len_low)
 271{
 272        return SYSC_s390_fallocate((int) fd, (int) mode, offset,
 273                                   (u32) len_high, (u32) len_low);
 274}
 275SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
 276#endif
 277
 278#endif
 279