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1da177e4 LT |
1 | /* $Id: sys_cris.c,v 1.6 2004/03/11 11:38:40 starvik Exp $ |
2 | * | |
3 | * linux/arch/cris/kernel/sys_cris.c | |
4 | * | |
5 | * This file contains various random system calls that | |
6 | * have a non-standard calling sequence on some platforms. | |
7 | * Since we don't have to do any backwards compatibility, our | |
8 | * versions are done in the most "normal" way possible. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/errno.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/syscalls.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/smp_lock.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 | ||
25 | #include <asm/uaccess.h> | |
26 | #include <asm/ipc.h> | |
27 | #include <asm/segment.h> | |
28 | ||
29 | /* | |
30 | * sys_pipe() is the normal C calling standard for creating | |
31 | * a pipe. It's not the way Unix traditionally does this, though. | |
32 | */ | |
33 | asmlinkage int sys_pipe(unsigned long __user * fildes) | |
34 | { | |
35 | int fd[2]; | |
36 | int error; | |
37 | ||
38 | lock_kernel(); | |
39 | error = do_pipe(fd); | |
40 | unlock_kernel(); | |
41 | if (!error) { | |
42 | if (copy_to_user(fildes, fd, 2*sizeof(int))) | |
43 | error = -EFAULT; | |
44 | } | |
45 | return error; | |
46 | } | |
47 | ||
48 | /* common code for old and new mmaps */ | |
49 | static inline long | |
50 | do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, | |
51 | unsigned long flags, unsigned long fd, unsigned long pgoff) | |
52 | { | |
53 | int error = -EBADF; | |
54 | struct file * file = NULL; | |
55 | ||
56 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
57 | if (!(flags & MAP_ANONYMOUS)) { | |
58 | file = fget(fd); | |
59 | if (!file) | |
60 | goto out; | |
61 | } | |
62 | ||
63 | down_write(¤t->mm->mmap_sem); | |
64 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
65 | up_write(¤t->mm->mmap_sem); | |
66 | ||
67 | if (file) | |
68 | fput(file); | |
69 | out: | |
70 | return error; | |
71 | } | |
72 | ||
73 | asmlinkage unsigned long old_mmap(unsigned long __user *args) | |
74 | { | |
75 | unsigned long buffer[6]; | |
76 | int err = -EFAULT; | |
77 | ||
78 | if (copy_from_user(&buffer, args, sizeof(buffer))) | |
79 | goto out; | |
80 | ||
81 | err = -EINVAL; | |
82 | if (buffer[5] & ~PAGE_MASK) /* verify that offset is on page boundary */ | |
83 | goto out; | |
84 | ||
85 | err = do_mmap2(buffer[0], buffer[1], buffer[2], buffer[3], | |
86 | buffer[4], buffer[5] >> PAGE_SHIFT); | |
87 | out: | |
88 | return err; | |
89 | } | |
90 | ||
91 | asmlinkage long | |
92 | sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, | |
93 | unsigned long flags, unsigned long fd, unsigned long pgoff) | |
94 | { | |
95 | return do_mmap2(addr, len, prot, flags, fd, pgoff); | |
96 | } | |
97 | ||
98 | /* | |
99 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
100 | * | |
101 | * This is really horribly ugly. (same as arch/i386) | |
102 | */ | |
103 | ||
104 | asmlinkage int sys_ipc (uint call, int first, int second, | |
105 | int third, void __user *ptr, long fifth) | |
106 | { | |
107 | int version, ret; | |
108 | ||
109 | version = call >> 16; /* hack for backward compatibility */ | |
110 | call &= 0xffff; | |
111 | ||
112 | switch (call) { | |
113 | case SEMOP: | |
114 | return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); | |
115 | case SEMTIMEDOP: | |
116 | return sys_semtimedop(first, (struct sembuf __user *)ptr, second, | |
117 | (const struct timespec __user *)fifth); | |
118 | ||
119 | case SEMGET: | |
120 | return sys_semget (first, second, third); | |
121 | case SEMCTL: { | |
122 | union semun fourth; | |
123 | if (!ptr) | |
124 | return -EINVAL; | |
125 | if (get_user(fourth.__pad, (void * __user *) ptr)) | |
126 | return -EFAULT; | |
127 | return sys_semctl (first, second, third, fourth); | |
128 | } | |
129 | ||
130 | case MSGSND: | |
131 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
132 | second, third); | |
133 | case MSGRCV: | |
134 | switch (version) { | |
135 | case 0: { | |
136 | struct ipc_kludge tmp; | |
137 | if (!ptr) | |
138 | return -EINVAL; | |
139 | ||
140 | if (copy_from_user(&tmp, | |
141 | (struct ipc_kludge __user *) ptr, | |
142 | sizeof (tmp))) | |
143 | return -EFAULT; | |
144 | return sys_msgrcv (first, tmp.msgp, second, | |
145 | tmp.msgtyp, third); | |
146 | } | |
147 | default: | |
148 | return sys_msgrcv (first, | |
149 | (struct msgbuf __user *) ptr, | |
150 | second, fifth, third); | |
151 | } | |
152 | case MSGGET: | |
153 | return sys_msgget ((key_t) first, second); | |
154 | case MSGCTL: | |
155 | return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); | |
156 | ||
157 | case SHMAT: { | |
158 | ulong raddr; | |
159 | ret = do_shmat (first, (char __user *) ptr, second, &raddr); | |
160 | if (ret) | |
161 | return ret; | |
162 | return put_user (raddr, (ulong __user *) third); | |
163 | } | |
164 | case SHMDT: | |
165 | return sys_shmdt ((char __user *)ptr); | |
166 | case SHMGET: | |
167 | return sys_shmget (first, second, third); | |
168 | case SHMCTL: | |
169 | return sys_shmctl (first, second, | |
170 | (struct shmid_ds __user *) ptr); | |
171 | default: | |
172 | return -ENOSYS; | |
173 | } | |
174 | } |