ARM: OMAP2/3: CM: fix cm_split_idlest functionality
[sfrench/cifs-2.6.git] / ipc / syscall.c
1 /*
2  * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
3  *
4  * This is really horribly ugly, and new architectures should just wire up
5  * the individual syscalls instead.
6  */
7 #include <linux/unistd.h>
8 #include <linux/syscalls.h>
9
10 #ifdef __ARCH_WANT_SYS_IPC
11 #include <linux/errno.h>
12 #include <linux/ipc.h>
13 #include <linux/shm.h>
14 #include <linux/uaccess.h>
15
16 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
17                 unsigned long, third, void __user *, ptr, long, fifth)
18 {
19         int version, ret;
20
21         version = call >> 16; /* hack for backward compatibility */
22         call &= 0xffff;
23
24         switch (call) {
25         case SEMOP:
26                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
27                                       second, NULL);
28         case SEMTIMEDOP:
29                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
30                                       second,
31                                       (const struct timespec __user *)fifth);
32
33         case SEMGET:
34                 return sys_semget(first, second, third);
35         case SEMCTL: {
36                 unsigned long arg;
37                 if (!ptr)
38                         return -EINVAL;
39                 if (get_user(arg, (unsigned long __user *) ptr))
40                         return -EFAULT;
41                 return sys_semctl(first, second, third, arg);
42         }
43
44         case MSGSND:
45                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
46                                   second, third);
47         case MSGRCV:
48                 switch (version) {
49                 case 0: {
50                         struct ipc_kludge tmp;
51                         if (!ptr)
52                                 return -EINVAL;
53
54                         if (copy_from_user(&tmp,
55                                            (struct ipc_kludge __user *) ptr,
56                                            sizeof(tmp)))
57                                 return -EFAULT;
58                         return sys_msgrcv(first, tmp.msgp, second,
59                                            tmp.msgtyp, third);
60                 }
61                 default:
62                         return sys_msgrcv(first,
63                                            (struct msgbuf __user *) ptr,
64                                            second, fifth, third);
65                 }
66         case MSGGET:
67                 return sys_msgget((key_t) first, second);
68         case MSGCTL:
69                 return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
70
71         case SHMAT:
72                 switch (version) {
73                 default: {
74                         unsigned long raddr;
75                         ret = do_shmat(first, (char __user *)ptr,
76                                        second, &raddr, SHMLBA);
77                         if (ret)
78                                 return ret;
79                         return put_user(raddr, (unsigned long __user *) third);
80                 }
81                 case 1:
82                         /*
83                          * This was the entry point for kernel-originating calls
84                          * from iBCS2 in 2.2 days.
85                          */
86                         return -EINVAL;
87                 }
88         case SHMDT:
89                 return sys_shmdt((char __user *)ptr);
90         case SHMGET:
91                 return sys_shmget(first, second, third);
92         case SHMCTL:
93                 return sys_shmctl(first, second,
94                                    (struct shmid_ds __user *) ptr);
95         default:
96                 return -ENOSYS;
97         }
98 }
99 #endif
100
101 #ifdef CONFIG_COMPAT
102 #include <linux/compat.h>
103
104 #ifndef COMPAT_SHMLBA
105 #define COMPAT_SHMLBA   SHMLBA
106 #endif
107
108 struct compat_ipc_kludge {
109         compat_uptr_t msgp;
110         compat_long_t msgtyp;
111 };
112
113 #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
114 COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
115         u32, third, compat_uptr_t, ptr, u32, fifth)
116 {
117         int version;
118         u32 pad;
119
120         version = call >> 16; /* hack for backward compatibility */
121         call &= 0xffff;
122
123         switch (call) {
124         case SEMOP:
125                 /* struct sembuf is the same on 32 and 64bit :)) */
126                 return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
127         case SEMTIMEDOP:
128                 return compat_sys_semtimedop(first, compat_ptr(ptr), second,
129                                                 compat_ptr(fifth));
130         case SEMGET:
131                 return sys_semget(first, second, third);
132         case SEMCTL:
133                 if (!ptr)
134                         return -EINVAL;
135                 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
136                         return -EFAULT;
137                 return compat_sys_semctl(first, second, third, pad);
138
139         case MSGSND:
140                 return compat_sys_msgsnd(first, ptr, second, third);
141
142         case MSGRCV: {
143                 void __user *uptr = compat_ptr(ptr);
144
145                 if (first < 0 || second < 0)
146                         return -EINVAL;
147
148                 if (!version) {
149                         struct compat_ipc_kludge ipck;
150                         if (!uptr)
151                                 return -EINVAL;
152                         if (copy_from_user(&ipck, uptr, sizeof(ipck)))
153                                 return -EFAULT;
154                         return compat_sys_msgrcv(first, ipck.msgp, second,
155                                                  ipck.msgtyp, third);
156                 }
157                 return compat_sys_msgrcv(first, ptr, second, fifth, third);
158         }
159         case MSGGET:
160                 return sys_msgget(first, second);
161         case MSGCTL:
162                 return compat_sys_msgctl(first, second, compat_ptr(ptr));
163
164         case SHMAT: {
165                 int err;
166                 unsigned long raddr;
167
168                 if (version == 1)
169                         return -EINVAL;
170                 err = do_shmat(first, compat_ptr(ptr), second, &raddr,
171                                COMPAT_SHMLBA);
172                 if (err < 0)
173                         return err;
174                 return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
175         }
176         case SHMDT:
177                 return sys_shmdt(compat_ptr(ptr));
178         case SHMGET:
179                 return sys_shmget(first, (unsigned)second, third);
180         case SHMCTL:
181                 return compat_sys_shmctl(first, second, compat_ptr(ptr));
182         }
183
184         return -ENOSYS;
185 }
186 #endif
187 #endif