Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-nvram
[linux-2.6] / arch / sh / kernel / sys_sh.c
1 /*
2  * linux/arch/sh/kernel/sys_sh.c
3  *
4  * This file contains various random system calls that
5  * have a non-standard calling sequence on the Linux/SuperH
6  * platform.
7  *
8  * Taken from i386 version.
9  */
10 #include <linux/errno.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/smp.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/syscalls.h>
19 #include <linux/mman.h>
20 #include <linux/file.h>
21 #include <linux/utsname.h>
22 #include <linux/module.h>
23 #include <linux/fs.h>
24 #include <linux/ipc.h>
25 #include <asm/syscalls.h>
26 #include <asm/uaccess.h>
27 #include <asm/unistd.h>
28
29 static inline long
30 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
31          unsigned long flags, int fd, unsigned long pgoff)
32 {
33         int error = -EBADF;
34         struct file *file = NULL;
35
36         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
37         if (!(flags & MAP_ANONYMOUS)) {
38                 file = fget(fd);
39                 if (!file)
40                         goto out;
41         }
42
43         down_write(&current->mm->mmap_sem);
44         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
45         up_write(&current->mm->mmap_sem);
46
47         if (file)
48                 fput(file);
49 out:
50         return error;
51 }
52
53 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
54         unsigned long prot, unsigned long flags,
55         int fd, unsigned long off)
56 {
57         if (off & ~PAGE_MASK)
58                 return -EINVAL;
59         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
60 }
61
62 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
63         unsigned long prot, unsigned long flags,
64         unsigned long fd, unsigned long pgoff)
65 {
66         return do_mmap2(addr, len, prot, flags, fd, pgoff);
67 }
68
69 /*
70  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
71  *
72  * This is really horribly ugly.
73  */
74 asmlinkage int sys_ipc(uint call, int first, int second,
75                        int third, void __user *ptr, long fifth)
76 {
77         int version, ret;
78
79         version = call >> 16; /* hack for backward compatibility */
80         call &= 0xffff;
81
82         trace_mark(kernel_arch_ipc_call, "call %u first %d", call, first);
83
84         if (call <= SEMTIMEDOP)
85                 switch (call) {
86                 case SEMOP:
87                         return sys_semtimedop(first,
88                                               (struct sembuf __user *)ptr,
89                                               second, NULL);
90                 case SEMTIMEDOP:
91                         return sys_semtimedop(first,
92                                 (struct sembuf __user *)ptr, second,
93                                 (const struct timespec __user *)fifth);
94                 case SEMGET:
95                         return sys_semget (first, second, third);
96                 case SEMCTL: {
97                         union semun fourth;
98                         if (!ptr)
99                                 return -EINVAL;
100                         if (get_user(fourth.__pad, (void __user * __user *) ptr))
101                                 return -EFAULT;
102                         return sys_semctl (first, second, third, fourth);
103                         }
104                 default:
105                         return -EINVAL;
106                 }
107
108         if (call <= MSGCTL)
109                 switch (call) {
110                 case MSGSND:
111                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
112                                           second, third);
113                 case MSGRCV:
114                         switch (version) {
115                         case 0:
116                         {
117                                 struct ipc_kludge tmp;
118
119                                 if (!ptr)
120                                         return -EINVAL;
121
122                                 if (copy_from_user(&tmp,
123                                         (struct ipc_kludge __user *) ptr,
124                                                    sizeof (tmp)))
125                                         return -EFAULT;
126
127                                 return sys_msgrcv (first, tmp.msgp, second,
128                                                    tmp.msgtyp, third);
129                         }
130                         default:
131                                 return sys_msgrcv (first,
132                                                    (struct msgbuf __user *) ptr,
133                                                    second, fifth, third);
134                         }
135                 case MSGGET:
136                         return sys_msgget ((key_t) first, second);
137                 case MSGCTL:
138                         return sys_msgctl (first, second,
139                                            (struct msqid_ds __user *) ptr);
140                 default:
141                         return -EINVAL;
142                 }
143         if (call <= SHMCTL)
144                 switch (call) {
145                 case SHMAT:
146                         switch (version) {
147                         default: {
148                                 ulong raddr;
149                                 ret = do_shmat (first, (char __user *) ptr,
150                                                  second, &raddr);
151                                 if (ret)
152                                         return ret;
153                                 return put_user (raddr, (ulong __user *) third);
154                         }
155                         case 1: /* iBCS2 emulator entry point */
156                                 if (!segment_eq(get_fs(), get_ds()))
157                                         return -EINVAL;
158                                 return do_shmat (first, (char __user *) ptr,
159                                                   second, (ulong *) third);
160                         }
161                 case SHMDT:
162                         return sys_shmdt ((char __user *)ptr);
163                 case SHMGET:
164                         return sys_shmget (first, second, third);
165                 case SHMCTL:
166                         return sys_shmctl (first, second,
167                                            (struct shmid_ds __user *) ptr);
168                 default:
169                         return -EINVAL;
170                 }
171
172         return -EINVAL;
173 }
174
175 asmlinkage int sys_uname(struct old_utsname __user *name)
176 {
177         int err;
178         if (!name)
179                 return -EFAULT;
180         down_read(&uts_sem);
181         err = copy_to_user(name, utsname(), sizeof(*name));
182         up_read(&uts_sem);
183         return err?-EFAULT:0;
184 }