Root/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
41struct 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
50SYSCALL_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);
58out:
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 */
67SYSCALL_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
134SYSCALL_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
153SYSCALL_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
160struct fadvise64_64_args {
161    int fd;
162    long long offset;
163    long long len;
164    int advice;
165};
166
167SYSCALL_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 */
188SYSCALL_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
194asmlinkage 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}
200SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
201#endif
202
203#endif
204

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