Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6
[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         /*
67          * The shift for mmap2 is constant, regardless of PAGE_SIZE
68          * setting.
69          */
70         if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
71                 return -EINVAL;
72
73         pgoff >>= PAGE_SHIFT - 12;
74
75         return do_mmap2(addr, len, prot, flags, fd, pgoff);
76 }
77
78 /*
79  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
80  *
81  * This is really horribly ugly.
82  */
83 asmlinkage int sys_ipc(uint call, int first, int second,
84                        int third, void __user *ptr, long fifth)
85 {
86         int version, ret;
87
88         version = call >> 16; /* hack for backward compatibility */
89         call &= 0xffff;
90
91         trace_mark(kernel_arch_ipc_call, "call %u first %d", call, first);
92
93         if (call <= SEMTIMEDOP)
94                 switch (call) {
95                 case SEMOP:
96                         return sys_semtimedop(first,
97                                               (struct sembuf __user *)ptr,
98                                               second, NULL);
99                 case SEMTIMEDOP:
100                         return sys_semtimedop(first,
101                                 (struct sembuf __user *)ptr, second,
102                                 (const struct timespec __user *)fifth);
103                 case SEMGET:
104                         return sys_semget (first, second, third);
105                 case SEMCTL: {
106                         union semun fourth;
107                         if (!ptr)
108                                 return -EINVAL;
109                         if (get_user(fourth.__pad, (void __user * __user *) ptr))
110                                 return -EFAULT;
111                         return sys_semctl (first, second, third, fourth);
112                         }
113                 default:
114                         return -EINVAL;
115                 }
116
117         if (call <= MSGCTL)
118                 switch (call) {
119                 case MSGSND:
120                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
121                                           second, third);
122                 case MSGRCV:
123                         switch (version) {
124                         case 0:
125                         {
126                                 struct ipc_kludge tmp;
127
128                                 if (!ptr)
129                                         return -EINVAL;
130
131                                 if (copy_from_user(&tmp,
132                                         (struct ipc_kludge __user *) ptr,
133                                                    sizeof (tmp)))
134                                         return -EFAULT;
135
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                 default:
150                         return -EINVAL;
151                 }
152         if (call <= SHMCTL)
153                 switch (call) {
154                 case SHMAT:
155                         switch (version) {
156                         default: {
157                                 ulong raddr;
158                                 ret = do_shmat (first, (char __user *) ptr,
159                                                  second, &raddr);
160                                 if (ret)
161                                         return ret;
162                                 return put_user (raddr, (ulong __user *) third);
163                         }
164                         case 1: /* iBCS2 emulator entry point */
165                                 if (!segment_eq(get_fs(), get_ds()))
166                                         return -EINVAL;
167                                 return do_shmat (first, (char __user *) ptr,
168                                                   second, (ulong *) third);
169                         }
170                 case SHMDT:
171                         return sys_shmdt ((char __user *)ptr);
172                 case SHMGET:
173                         return sys_shmget (first, second, third);
174                 case SHMCTL:
175                         return sys_shmctl (first, second,
176                                            (struct shmid_ds __user *) ptr);
177                 default:
178                         return -EINVAL;
179                 }
180
181         return -EINVAL;
182 }
183
184 asmlinkage int sys_uname(struct old_utsname __user *name)
185 {
186         int err;
187         if (!name)
188                 return -EFAULT;
189         down_read(&uts_sem);
190         err = copy_to_user(name, utsname(), sizeof(*name));
191         up_read(&uts_sem);
192         return err?-EFAULT:0;
193 }