Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block
[linux-block.git] / arch / frv / kernel / sys_frv.c
1 /* sys_frv.c: FRV arch-specific syscall wrappers
2  *
3  * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  * - Derived from arch/m68k/kernel/sys_m68k.c
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version
10  * 2 of the License, or (at your option) any later version.
11  */
12
13 #include <linux/errno.h>
14 #include <linux/sched.h>
15 #include <linux/mm.h>
16 #include <linux/fs.h>
17 #include <linux/smp.h>
18 #include <linux/sem.h>
19 #include <linux/msg.h>
20 #include <linux/shm.h>
21 #include <linux/stat.h>
22 #include <linux/mman.h>
23 #include <linux/file.h>
24 #include <linux/syscalls.h>
25 #include <linux/ipc.h>
26
27 #include <asm/setup.h>
28 #include <asm/uaccess.h>
29
30 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
31                           unsigned long prot, unsigned long flags,
32                           unsigned long fd, unsigned long pgoff)
33 {
34         int error = -EBADF;
35         struct file * file = NULL;
36
37         /* As with sparc32, make sure the shift for mmap2 is constant
38            (12), no matter what PAGE_SIZE we have.... */
39
40         /* But unlike sparc32, don't just silently break if we're
41            trying to map something we can't */
42         if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
43                 return -EINVAL;
44         pgoff >>= PAGE_SHIFT - 12;
45
46         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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 #if 0 /* DAVIDM - do we want this */
64 struct mmap_arg_struct64 {
65         __u32 addr;
66         __u32 len;
67         __u32 prot;
68         __u32 flags;
69         __u64 offset; /* 64 bits */
70         __u32 fd;
71 };
72
73 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
74 {
75         int error = -EFAULT;
76         struct file * file = NULL;
77         struct mmap_arg_struct64 a;
78         unsigned long pgoff;
79
80         if (copy_from_user(&a, arg, sizeof(a)))
81                 return -EFAULT;
82
83         if ((long)a.offset & ~PAGE_MASK)
84                 return -EINVAL;
85
86         pgoff = a.offset >> PAGE_SHIFT;
87         if ((a.offset >> PAGE_SHIFT) != pgoff)
88                 return -EINVAL;
89
90         if (!(a.flags & MAP_ANONYMOUS)) {
91                 error = -EBADF;
92                 file = fget(a.fd);
93                 if (!file)
94                         goto out;
95         }
96         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
97
98         down_write(&current->mm->mmap_sem);
99         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
100         up_write(&current->mm->mmap_sem);
101         if (file)
102                 fput(file);
103 out:
104         return error;
105 }
106 #endif
107
108 /*
109  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
110  *
111  * This is really horribly ugly.
112  */
113 asmlinkage long sys_ipc(unsigned long call,
114                         unsigned long first,
115                         unsigned long second,
116                         unsigned long third,
117                         void __user *ptr,
118                         unsigned long fifth)
119 {
120         int version, ret;
121
122         version = call >> 16; /* hack for backward compatibility */
123         call &= 0xffff;
124
125         switch (call) {
126         case SEMOP:
127                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL);
128         case SEMTIMEDOP:
129                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
130                                       (const struct timespec __user *)fifth);
131
132         case SEMGET:
133                 return sys_semget (first, second, third);
134         case SEMCTL: {
135                 union semun fourth;
136                 if (!ptr)
137                         return -EINVAL;
138                 if (get_user(fourth.__pad, (void * __user *) ptr))
139                         return -EFAULT;
140                 return sys_semctl (first, second, third, fourth);
141         }
142
143         case MSGSND:
144                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
145                                    second, third);
146         case MSGRCV:
147                 switch (version) {
148                 case 0: {
149                         struct ipc_kludge tmp;
150                         if (!ptr)
151                                 return -EINVAL;
152
153                         if (copy_from_user(&tmp,
154                                            (struct ipc_kludge __user *) ptr,
155                                            sizeof (tmp)))
156                                 return -EFAULT;
157                         return sys_msgrcv (first, tmp.msgp, second,
158                                            tmp.msgtyp, third);
159                 }
160                 default:
161                         return sys_msgrcv (first,
162                                            (struct msgbuf __user *) ptr,
163                                            second, fifth, third);
164                 }
165         case MSGGET:
166                 return sys_msgget ((key_t) first, second);
167         case MSGCTL:
168                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
169
170         case SHMAT:
171                 switch (version) {
172                 default: {
173                         ulong raddr;
174                         ret = do_shmat (first, (char __user *) ptr, second, &raddr);
175                         if (ret)
176                                 return ret;
177                         return put_user (raddr, (ulong __user *) third);
178                 }
179                 case 1: /* iBCS2 emulator entry point */
180                         if (!segment_eq(get_fs(), get_ds()))
181                                 return -EINVAL;
182                         /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
183                         return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
184                 }
185         case SHMDT:
186                 return sys_shmdt ((char __user *)ptr);
187         case SHMGET:
188                 return sys_shmget (first, second, third);
189         case SHMCTL:
190                 return sys_shmctl (first, second,
191                                    (struct shmid_ds __user *) ptr);
192         default:
193                 return -ENOSYS;
194         }
195 }