unified (weak) sys_pipe implementation
[linux-3.10.git] / arch / mn10300 / kernel / sys_mn10300.c
1 /* MN10300 Weird system calls
2  *
3  * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public Licence
8  * as published by the Free Software Foundation; either version
9  * 2 of the Licence, or (at your option) any later version.
10  */
11 #include <linux/errno.h>
12 #include <linux/sched.h>
13 #include <linux/syscalls.h>
14 #include <linux/mm.h>
15 #include <linux/smp.h>
16 #include <linux/smp_lock.h>
17 #include <linux/sem.h>
18 #include <linux/msg.h>
19 #include <linux/shm.h>
20 #include <linux/stat.h>
21 #include <linux/mman.h>
22 #include <linux/file.h>
23 #include <linux/utsname.h>
24 #include <linux/syscalls.h>
25 #include <linux/tty.h>
26
27 #include <asm/uaccess.h>
28
29 #define MIN_MAP_ADDR    PAGE_SIZE       /* minimum fixed mmap address */
30
31 /*
32  * memory mapping syscall
33  */
34 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
35                           unsigned long prot, unsigned long flags,
36                           unsigned long fd, unsigned long pgoff)
37 {
38         struct file *file = NULL;
39         long error = -EINVAL;
40
41         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
42
43         if (flags & MAP_FIXED && addr < MIN_MAP_ADDR)
44                 goto out;
45
46         error = -EBADF;
47         if (!(flags & MAP_ANONYMOUS)) {
48                 file = fget(fd);
49                 if (!file)
50                         goto out;
51         }
52
53         down_write(&current->mm->mmap_sem);
54         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
55         up_write(&current->mm->mmap_sem);
56
57         if (file)
58                 fput(file);
59 out:
60         return error;
61 }
62
63 asmlinkage long old_mmap(unsigned long addr, unsigned long len,
64                          unsigned long prot, unsigned long flags,
65                          unsigned long fd, unsigned long offset)
66 {
67         if (offset & ~PAGE_MASK)
68                 return -EINVAL;
69         return sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
70 }
71
72 struct sel_arg_struct {
73         unsigned long n;
74         fd_set *inp;
75         fd_set *outp;
76         fd_set *exp;
77         struct timeval *tvp;
78 };
79
80 asmlinkage int old_select(struct sel_arg_struct __user *arg)
81 {
82         struct sel_arg_struct a;
83
84         if (copy_from_user(&a, arg, sizeof(a)))
85                 return -EFAULT;
86         /* sys_select() does the appropriate kernel locking */
87         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
88 }
89
90 /*
91  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
92  *
93  * This is really horribly ugly.
94  */
95 asmlinkage long sys_ipc(uint call, int first, int second,
96                         int third, void __user *ptr, long fifth)
97 {
98         int version, ret;
99
100         version = call >> 16; /* hack for backward compatibility */
101         call &= 0xffff;
102
103         switch (call) {
104         case SEMOP:
105                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
106                                       second, NULL);
107         case SEMTIMEDOP:
108                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
109                                       second,
110                                       (const struct timespec __user *)fifth);
111         case SEMGET:
112                 return sys_semget(first, second, third);
113         case SEMCTL: {
114                 union semun fourth;
115                 if (!ptr)
116                         return -EINVAL;
117                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
118                         return -EFAULT;
119                 return sys_semctl(first, second, third, fourth);
120         }
121
122         case MSGSND:
123                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
124                                   second, third);
125         case MSGRCV:
126                 switch (version) {
127                 case 0: {
128                         struct ipc_kludge tmp;
129                         if (!ptr)
130                                 return -EINVAL;
131
132                         if (copy_from_user(&tmp,
133                                            (struct ipc_kludge __user *) ptr,
134                                            sizeof(tmp)))
135                                 return -EFAULT;
136                         return sys_msgrcv(first, tmp.msgp, second,
137                                           tmp.msgtyp, third);
138                 }
139                 default:
140                         return sys_msgrcv(first,
141                                           (struct msgbuf __user *) ptr,
142                                            second, fifth, third);
143                 }
144         case MSGGET:
145                 return sys_msgget((key_t) first, second);
146         case MSGCTL:
147                 return sys_msgctl(first, second,
148                                    (struct msqid_ds __user *) ptr);
149
150         case SHMAT:
151                 switch (version) {
152                 default: {
153                         ulong raddr;
154                         ret = do_shmat(first, (char __user *) ptr, second,
155                                        &raddr);
156                         if (ret)
157                                 return ret;
158                         return put_user(raddr, (ulong *) third);
159                 }
160                 case 1: /* iBCS2 emulator entry point */
161                         if (!segment_eq(get_fs(), get_ds()))
162                                 return -EINVAL;
163                         return do_shmat(first, (char __user *) ptr, second,
164                                         (ulong *) third);
165                 }
166         case SHMDT:
167                 return sys_shmdt((char __user *)ptr);
168         case SHMGET:
169                 return sys_shmget(first, second, third);
170         case SHMCTL:
171                 return sys_shmctl(first, second,
172                                   (struct shmid_ds __user *) ptr);
173         default:
174                 return -EINVAL;
175         }
176 }