Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/i386/kernel/sys_i386.c | |
3 | * | |
4 | * This file contains various random system calls that | |
5 | * have a non-standard calling sequence on the Linux/i386 | |
6 | * platform. | |
7 | */ | |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/smp.h> | |
13 | #include <linux/smp_lock.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 | ||
23 | #include <asm/uaccess.h> | |
24 | #include <asm/ipc.h> | |
25 | ||
26 | /* | |
27 | * sys_pipe() is the normal C calling standard for creating | |
28 | * a pipe. It's not the way Unix traditionally does this, though. | |
29 | */ | |
30 | asmlinkage int sys_pipe(unsigned long __user * fildes) | |
31 | { | |
32 | int fd[2]; | |
33 | int error; | |
34 | ||
35 | error = do_pipe(fd); | |
36 | if (!error) { | |
37 | if (copy_to_user(fildes, fd, 2*sizeof(int))) | |
38 | error = -EFAULT; | |
39 | } | |
40 | return error; | |
41 | } | |
42 | ||
43 | /* common code for old and new mmaps */ | |
44 | static inline long do_mmap2( | |
45 | unsigned long addr, unsigned long len, | |
46 | unsigned long prot, unsigned long flags, | |
47 | unsigned long fd, unsigned long pgoff) | |
48 | { | |
49 | int error = -EBADF; | |
50 | struct file * file = NULL; | |
51 | ||
52 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
53 | if (!(flags & MAP_ANONYMOUS)) { | |
54 | file = fget(fd); | |
55 | if (!file) | |
56 | goto out; | |
57 | } | |
58 | ||
59 | down_write(¤t->mm->mmap_sem); | |
60 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
61 | up_write(¤t->mm->mmap_sem); | |
62 | ||
63 | if (file) | |
64 | fput(file); | |
65 | out: | |
66 | return error; | |
67 | } | |
68 | ||
69 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, | |
70 | unsigned long prot, unsigned long flags, | |
71 | unsigned long fd, unsigned long pgoff) | |
72 | { | |
73 | return do_mmap2(addr, len, prot, flags, fd, pgoff); | |
74 | } | |
75 | ||
76 | /* | |
77 | * Perform the select(nd, in, out, ex, tv) and mmap() system | |
78 | * calls. Linux/i386 didn't use to be able to handle more than | |
79 | * 4 system call parameters, so these system calls used a memory | |
80 | * block for parameter passing.. | |
81 | */ | |
82 | ||
83 | struct mmap_arg_struct { | |
84 | unsigned long addr; | |
85 | unsigned long len; | |
86 | unsigned long prot; | |
87 | unsigned long flags; | |
88 | unsigned long fd; | |
89 | unsigned long offset; | |
90 | }; | |
91 | ||
92 | asmlinkage int old_mmap(struct mmap_arg_struct __user *arg) | |
93 | { | |
94 | struct mmap_arg_struct a; | |
95 | int err = -EFAULT; | |
96 | ||
97 | if (copy_from_user(&a, arg, sizeof(a))) | |
98 | goto out; | |
99 | ||
100 | err = -EINVAL; | |
101 | if (a.offset & ~PAGE_MASK) | |
102 | goto out; | |
103 | ||
104 | err = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); | |
105 | out: | |
106 | return err; | |
107 | } | |
108 | ||
109 | ||
110 | struct sel_arg_struct { | |
111 | unsigned long n; | |
112 | fd_set __user *inp, *outp, *exp; | |
113 | struct timeval __user *tvp; | |
114 | }; | |
115 | ||
116 | asmlinkage int old_select(struct sel_arg_struct __user *arg) | |
117 | { | |
118 | struct sel_arg_struct a; | |
119 | ||
120 | if (copy_from_user(&a, arg, sizeof(a))) | |
121 | return -EFAULT; | |
122 | /* sys_select() does the appropriate kernel locking */ | |
123 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); | |
124 | } | |
125 | ||
126 | /* | |
127 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
128 | * | |
129 | * This is really horribly ugly. | |
130 | */ | |
131 | asmlinkage int sys_ipc (uint call, int first, int second, | |
132 | int third, void __user *ptr, long fifth) | |
133 | { | |
134 | int version, ret; | |
135 | ||
136 | version = call >> 16; /* hack for backward compatibility */ | |
137 | call &= 0xffff; | |
138 | ||
139 | switch (call) { | |
140 | case SEMOP: | |
141 | return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); | |
142 | case SEMTIMEDOP: | |
143 | return sys_semtimedop(first, (struct sembuf __user *)ptr, second, | |
144 | (const struct timespec __user *)fifth); | |
145 | ||
146 | case SEMGET: | |
147 | return sys_semget (first, second, third); | |
148 | case SEMCTL: { | |
149 | union semun fourth; | |
150 | if (!ptr) | |
151 | return -EINVAL; | |
152 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) | |
153 | return -EFAULT; | |
154 | return sys_semctl (first, second, third, fourth); | |
155 | } | |
156 | ||
157 | case MSGSND: | |
158 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
159 | second, third); | |
160 | case MSGRCV: | |
161 | switch (version) { | |
162 | case 0: { | |
163 | struct ipc_kludge tmp; | |
164 | if (!ptr) | |
165 | return -EINVAL; | |
166 | ||
167 | if (copy_from_user(&tmp, | |
168 | (struct ipc_kludge __user *) ptr, | |
169 | sizeof (tmp))) | |
170 | return -EFAULT; | |
171 | return sys_msgrcv (first, tmp.msgp, second, | |
172 | tmp.msgtyp, third); | |
173 | } | |
174 | default: | |
175 | return sys_msgrcv (first, | |
176 | (struct msgbuf __user *) ptr, | |
177 | second, fifth, third); | |
178 | } | |
179 | case MSGGET: | |
180 | return sys_msgget ((key_t) first, second); | |
181 | case MSGCTL: | |
182 | return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); | |
183 | ||
184 | case SHMAT: | |
185 | switch (version) { | |
186 | default: { | |
187 | ulong raddr; | |
188 | ret = do_shmat (first, (char __user *) ptr, second, &raddr); | |
189 | if (ret) | |
190 | return ret; | |
191 | return put_user (raddr, (ulong __user *) third); | |
192 | } | |
193 | case 1: /* iBCS2 emulator entry point */ | |
194 | if (!segment_eq(get_fs(), get_ds())) | |
195 | return -EINVAL; | |
196 | /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */ | |
197 | return do_shmat (first, (char __user *) ptr, second, (ulong *) third); | |
198 | } | |
199 | case SHMDT: | |
200 | return sys_shmdt ((char __user *)ptr); | |
201 | case SHMGET: | |
202 | return sys_shmget (first, second, third); | |
203 | case SHMCTL: | |
204 | return sys_shmctl (first, second, | |
205 | (struct shmid_ds __user *) ptr); | |
206 | default: | |
207 | return -ENOSYS; | |
208 | } | |
209 | } | |
210 | ||
211 | /* | |
212 | * Old cruft | |
213 | */ | |
214 | asmlinkage int sys_uname(struct old_utsname __user * name) | |
215 | { | |
216 | int err; | |
217 | if (!name) | |
218 | return -EFAULT; | |
219 | down_read(&uts_sem); | |
220 | err=copy_to_user(name, &system_utsname, sizeof (*name)); | |
221 | up_read(&uts_sem); | |
222 | return err?-EFAULT:0; | |
223 | } | |
224 | ||
225 | asmlinkage int sys_olduname(struct oldold_utsname __user * name) | |
226 | { | |
227 | int error; | |
228 | ||
229 | if (!name) | |
230 | return -EFAULT; | |
231 | if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) | |
232 | return -EFAULT; | |
233 | ||
234 | down_read(&uts_sem); | |
235 | ||
236 | error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN); | |
237 | error |= __put_user(0,name->sysname+__OLD_UTS_LEN); | |
238 | error |= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN); | |
239 | error |= __put_user(0,name->nodename+__OLD_UTS_LEN); | |
240 | error |= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN); | |
241 | error |= __put_user(0,name->release+__OLD_UTS_LEN); | |
242 | error |= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN); | |
243 | error |= __put_user(0,name->version+__OLD_UTS_LEN); | |
244 | error |= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN); | |
245 | error |= __put_user(0,name->machine+__OLD_UTS_LEN); | |
246 | ||
247 | up_read(&uts_sem); | |
248 | ||
249 | error = error ? -EFAULT : 0; | |
250 | ||
251 | return error; | |
252 | } |