linux/arch/s390/kernel/sys_s390.c
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   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 */
  36static 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);
  57out:
  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
  68struct 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
  77asmlinkage long sys_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);
  85out:
  86        return error;
  87}
  88
  89asmlinkage long 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);
 102out:
 103        return error;
 104}
 105
 106#ifndef CONFIG_64BIT
 107struct sel_arg_struct {
 108        unsigned long n;
 109        fd_set __user *inp, *outp, *exp;
 110        struct timeval __user *tvp;
 111};
 112
 113asmlinkage long old_select(struct sel_arg_struct __user *arg)
 114{
 115        struct sel_arg_struct a;
 116
 117        if (copy_from_user(&a, arg, sizeof(a)))
 118                return -EFAULT;
 119        /* sys_select() does the appropriate kernel locking */
 120        return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 121
 122}
 123#endif /* CONFIG_64BIT */
 124
 125/*
 126 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 127 *
 128 * This is really horribly ugly.
 129 */
 130asmlinkage long sys_ipc(uint call, int first, unsigned long second,
 131                                  unsigned long third, void __user *ptr)
 132{
 133        struct ipc_kludge tmp;
 134        int ret;
 135
 136        switch (call) {
 137        case SEMOP:
 138                return sys_semtimedop(first, (struct sembuf __user *)ptr,
 139                                       (unsigned)second, NULL);
 140        case SEMTIMEDOP:
 141                return sys_semtimedop(first, (struct sembuf __user *)ptr,
 142                                       (unsigned)second,
 143                                       (const struct timespec __user *) third);
 144        case SEMGET:
 145                return sys_semget(first, (int)second, third);
 146        case SEMCTL: {
 147                union semun fourth;
 148                if (!ptr)
 149                        return -EINVAL;
 150                if (get_user(fourth.__pad, (void __user * __user *) ptr))
 151                        return -EFAULT;
 152                return sys_semctl(first, (int)second, third, fourth);
 153        }
 154        case MSGSND:
 155                return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 156                                   (size_t)second, third);
 157                break;
 158        case MSGRCV:
 159                if (!ptr)
 160                        return -EINVAL;
 161                if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
 162                                    sizeof (struct ipc_kludge)))
 163                        return -EFAULT;
 164                return sys_msgrcv (first, tmp.msgp,
 165                                   (size_t)second, tmp.msgtyp, third);
 166        case MSGGET:
 167                return sys_msgget((key_t)first, (int)second);
 168        case MSGCTL:
 169                return sys_msgctl(first, (int)second,
 170                                   (struct msqid_ds __user *)ptr);
 171
 172        case SHMAT: {
 173                ulong raddr;
 174                ret = do_shmat(first, (char __user *)ptr,
 175                                (int)second, &raddr);
 176                if (ret)
 177                        return ret;
 178                return put_user (raddr, (ulong __user *) third);
 179                break;
 180        }
 181        case SHMDT:
 182                return sys_shmdt ((char __user *)ptr);
 183        case SHMGET:
 184                return sys_shmget(first, (size_t)second, third);
 185        case SHMCTL:
 186                return sys_shmctl(first, (int)second,
 187                                   (struct shmid_ds __user *) ptr);
 188        default:
 189                return -ENOSYS;
 190
 191        }
 192
 193        return -EINVAL;
 194}
 195
 196#ifdef CONFIG_64BIT
 197asmlinkage long s390x_newuname(struct new_utsname __user *name)
 198{
 199        int ret = sys_newuname(name);
 200
 201        if (personality(current->personality) == PER_LINUX32 && !ret) {
 202                ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
 203                if (ret) ret = -EFAULT;
 204        }
 205        return ret;
 206}
 207
 208asmlinkage long s390x_personality(unsigned long personality)
 209{
 210        int ret;
 211
 212        if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 213                personality = PER_LINUX32;
 214        ret = sys_personality(personality);
 215        if (ret == PER_LINUX32)
 216                ret = PER_LINUX;
 217
 218        return ret;
 219}
 220#endif /* CONFIG_64BIT */
 221
 222/*
 223 * Wrapper function for sys_fadvise64/fadvise64_64
 224 */
 225#ifndef CONFIG_64BIT
 226
 227asmlinkage long
 228s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
 229{
 230        return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
 231                        len, advice);
 232}
 233
 234#endif
 235
 236struct fadvise64_64_args {
 237        int fd;
 238        long long offset;
 239        long long len;
 240        int advice;
 241};
 242
 243asmlinkage long
 244s390_fadvise64_64(struct fadvise64_64_args __user *args)
 245{
 246        struct fadvise64_64_args a;
 247
 248        if ( copy_from_user(&a, args, sizeof(a)) )
 249                return -EFAULT;
 250        return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 251}
 252
 253#ifndef CONFIG_64BIT
 254/*
 255 * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
 256 * 64 bit argument "len" is split into the upper and lower 32 bits. The
 257 * system call wrapper in the user space loads the value to %r6/%r7.
 258 * The code in entry.S keeps the values in %r2 - %r6 where they are and
 259 * stores %r7 to 96(%r15). But the standard C linkage requires that
 260 * the whole 64 bit value for len is stored on the stack and doesn't
 261 * use %r6 at all. So s390_fallocate has to convert the arguments from
 262 *   %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
 263 * to
 264 *   %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
 265 */
 266asmlinkage long s390_fallocate(int fd, int mode, loff_t offset,
 267                               u32 len_high, u32 len_low)
 268{
 269        return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
 270}
 271#endif
 272