Merge commit 'v2.6.28-rc8' into x86/irq
[linux-2.6] / 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/utsname.h>
25 #include <linux/syscalls.h>
26 #include <linux/ipc.h>
27
28 #include <asm/setup.h>
29 #include <asm/uaccess.h>
30
31 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
32                           unsigned long prot, unsigned long flags,
33                           unsigned long fd, unsigned long pgoff)
34 {
35         int error = -EBADF;
36         struct file * file = NULL;
37
38         /* As with sparc32, make sure the shift for mmap2 is constant
39            (12), no matter what PAGE_SIZE we have.... */
40
41         /* But unlike sparc32, don't just silently break if we're
42            trying to map something we can't */
43         if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
44                 return -EINVAL;
45         pgoff >>= PAGE_SHIFT - 12;
46
47         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
48         if (!(flags & MAP_ANONYMOUS)) {
49                 file = fget(fd);
50                 if (!file)
51                         goto out;
52         }
53
54         down_write(&current->mm->mmap_sem);
55         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
56         up_write(&current->mm->mmap_sem);
57
58         if (file)
59                 fput(file);
60 out:
61         return error;
62 }
63
64 #if 0 /* DAVIDM - do we want this */
65 struct mmap_arg_struct64 {
66         __u32 addr;
67         __u32 len;
68         __u32 prot;
69         __u32 flags;
70         __u64 offset; /* 64 bits */
71         __u32 fd;
72 };
73
74 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
75 {
76         int error = -EFAULT;
77         struct file * file = NULL;
78         struct mmap_arg_struct64 a;
79         unsigned long pgoff;
80
81         if (copy_from_user(&a, arg, sizeof(a)))
82                 return -EFAULT;
83
84         if ((long)a.offset & ~PAGE_MASK)
85                 return -EINVAL;
86
87         pgoff = a.offset >> PAGE_SHIFT;
88         if ((a.offset >> PAGE_SHIFT) != pgoff)
89                 return -EINVAL;
90
91         if (!(a.flags & MAP_ANONYMOUS)) {
92                 error = -EBADF;
93                 file = fget(a.fd);
94                 if (!file)
95                         goto out;
96         }
97         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
98
99         down_write(&current->mm->mmap_sem);
100         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
101         up_write(&current->mm->mmap_sem);
102         if (file)
103                 fput(file);
104 out:
105         return error;
106 }
107 #endif
108
109 /*
110  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
111  *
112  * This is really horribly ugly.
113  */
114 asmlinkage long sys_ipc(unsigned long call,
115                         unsigned long first,
116                         unsigned long second,
117                         unsigned long third,
118                         void __user *ptr,
119                         unsigned long fifth)
120 {
121         int version, ret;
122
123         version = call >> 16; /* hack for backward compatibility */
124         call &= 0xffff;
125
126         switch (call) {
127         case SEMOP:
128                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL);
129         case SEMTIMEDOP:
130                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
131                                       (const struct timespec __user *)fifth);
132
133         case SEMGET:
134                 return sys_semget (first, second, third);
135         case SEMCTL: {
136                 union semun fourth;
137                 if (!ptr)
138                         return -EINVAL;
139                 if (get_user(fourth.__pad, (void * __user *) ptr))
140                         return -EFAULT;
141                 return sys_semctl (first, second, third, fourth);
142         }
143
144         case MSGSND:
145                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
146                                    second, third);
147         case MSGRCV:
148                 switch (version) {
149                 case 0: {
150                         struct ipc_kludge tmp;
151                         if (!ptr)
152                                 return -EINVAL;
153
154                         if (copy_from_user(&tmp,
155                                            (struct ipc_kludge __user *) ptr,
156                                            sizeof (tmp)))
157                                 return -EFAULT;
158                         return sys_msgrcv (first, tmp.msgp, second,
159                                            tmp.msgtyp, third);
160                 }
161                 default:
162                         return sys_msgrcv (first,
163                                            (struct msgbuf __user *) ptr,
164                                            second, fifth, third);
165                 }
166         case MSGGET:
167                 return sys_msgget ((key_t) first, second);
168         case MSGCTL:
169                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
170
171         case SHMAT:
172                 switch (version) {
173                 default: {
174                         ulong raddr;
175                         ret = do_shmat (first, (char __user *) ptr, second, &raddr);
176                         if (ret)
177                                 return ret;
178                         return put_user (raddr, (ulong __user *) third);
179                 }
180                 case 1: /* iBCS2 emulator entry point */
181                         if (!segment_eq(get_fs(), get_ds()))
182                                 return -EINVAL;
183                         /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
184                         return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
185                 }
186         case SHMDT:
187                 return sys_shmdt ((char __user *)ptr);
188         case SHMGET:
189                 return sys_shmget (first, second, third);
190         case SHMCTL:
191                 return sys_shmctl (first, second,
192                                    (struct shmid_ds __user *) ptr);
193         default:
194                 return -ENOSYS;
195         }
196 }