Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * This file contains various random system calls that |
3 | * have a non-standard calling sequence on the Linux/i386 | |
4 | * platform. | |
5 | */ | |
6 | ||
7 | #include <linux/errno.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/mm.h> | |
4e950f6f | 10 | #include <linux/fs.h> |
1da177e4 | 11 | #include <linux/smp.h> |
1da177e4 LT |
12 | #include <linux/sem.h> |
13 | #include <linux/msg.h> | |
14 | #include <linux/shm.h> | |
15 | #include <linux/stat.h> | |
16 | #include <linux/syscalls.h> | |
17 | #include <linux/mman.h> | |
18 | #include <linux/file.h> | |
19 | #include <linux/utsname.h> | |
20 | ||
21 | #include <asm/uaccess.h> | |
fe74290d | 22 | #include <asm/unistd.h> |
1da177e4 LT |
23 | #include <asm/ipc.h> |
24 | ||
25 | /* | |
26 | * sys_pipe() is the normal C calling standard for creating | |
27 | * a pipe. It's not the way Unix traditionally does this, though. | |
28 | */ | |
29 | asmlinkage int sys_pipe(unsigned long __user * fildes) | |
30 | { | |
31 | int fd[2]; | |
32 | int error; | |
33 | ||
34 | error = do_pipe(fd); | |
35 | if (!error) { | |
36 | if (copy_to_user(fildes, fd, 2*sizeof(int))) | |
37 | error = -EFAULT; | |
38 | } | |
39 | return error; | |
40 | } | |
41 | ||
a7290ee0 MB |
42 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, |
43 | unsigned long prot, unsigned long flags, | |
44 | unsigned long fd, unsigned long pgoff) | |
1da177e4 LT |
45 | { |
46 | int error = -EBADF; | |
a7290ee0 MB |
47 | struct file *file = NULL; |
48 | struct mm_struct *mm = current->mm; | |
1da177e4 LT |
49 | |
50 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
51 | if (!(flags & MAP_ANONYMOUS)) { | |
52 | file = fget(fd); | |
53 | if (!file) | |
54 | goto out; | |
55 | } | |
56 | ||
a7290ee0 | 57 | down_write(&mm->mmap_sem); |
1da177e4 | 58 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
a7290ee0 | 59 | up_write(&mm->mmap_sem); |
1da177e4 LT |
60 | |
61 | if (file) | |
62 | fput(file); | |
63 | out: | |
64 | return error; | |
65 | } | |
66 | ||
1da177e4 LT |
67 | /* |
68 | * Perform the select(nd, in, out, ex, tv) and mmap() system | |
69 | * calls. Linux/i386 didn't use to be able to handle more than | |
70 | * 4 system call parameters, so these system calls used a memory | |
71 | * block for parameter passing.. | |
72 | */ | |
73 | ||
74 | struct mmap_arg_struct { | |
75 | unsigned long addr; | |
76 | unsigned long len; | |
77 | unsigned long prot; | |
78 | unsigned long flags; | |
79 | unsigned long fd; | |
80 | unsigned long offset; | |
81 | }; | |
82 | ||
83 | asmlinkage int old_mmap(struct mmap_arg_struct __user *arg) | |
84 | { | |
85 | struct mmap_arg_struct a; | |
86 | int err = -EFAULT; | |
87 | ||
88 | if (copy_from_user(&a, arg, sizeof(a))) | |
89 | goto out; | |
90 | ||
91 | err = -EINVAL; | |
92 | if (a.offset & ~PAGE_MASK) | |
93 | goto out; | |
94 | ||
a7290ee0 MB |
95 | err = sys_mmap2(a.addr, a.len, a.prot, a.flags, |
96 | a.fd, a.offset >> PAGE_SHIFT); | |
1da177e4 LT |
97 | out: |
98 | return err; | |
99 | } | |
100 | ||
101 | ||
102 | struct sel_arg_struct { | |
103 | unsigned long n; | |
104 | fd_set __user *inp, *outp, *exp; | |
105 | struct timeval __user *tvp; | |
106 | }; | |
107 | ||
108 | asmlinkage int old_select(struct sel_arg_struct __user *arg) | |
109 | { | |
110 | struct sel_arg_struct a; | |
111 | ||
112 | if (copy_from_user(&a, arg, sizeof(a))) | |
113 | return -EFAULT; | |
114 | /* sys_select() does the appropriate kernel locking */ | |
115 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); | |
116 | } | |
117 | ||
118 | /* | |
119 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
120 | * | |
121 | * This is really horribly ugly. | |
122 | */ | |
123 | asmlinkage int sys_ipc (uint call, int first, int second, | |
124 | int third, void __user *ptr, long fifth) | |
125 | { | |
126 | int version, ret; | |
127 | ||
128 | version = call >> 16; /* hack for backward compatibility */ | |
129 | call &= 0xffff; | |
130 | ||
131 | switch (call) { | |
132 | case SEMOP: | |
133 | return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); | |
134 | case SEMTIMEDOP: | |
135 | return sys_semtimedop(first, (struct sembuf __user *)ptr, second, | |
136 | (const struct timespec __user *)fifth); | |
137 | ||
138 | case SEMGET: | |
139 | return sys_semget (first, second, third); | |
140 | case SEMCTL: { | |
141 | union semun fourth; | |
142 | if (!ptr) | |
143 | return -EINVAL; | |
144 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) | |
145 | return -EFAULT; | |
146 | return sys_semctl (first, second, third, fourth); | |
147 | } | |
148 | ||
149 | case MSGSND: | |
150 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
151 | second, third); | |
152 | case MSGRCV: | |
153 | switch (version) { | |
154 | case 0: { | |
155 | struct ipc_kludge tmp; | |
156 | if (!ptr) | |
157 | return -EINVAL; | |
158 | ||
159 | if (copy_from_user(&tmp, | |
160 | (struct ipc_kludge __user *) ptr, | |
161 | sizeof (tmp))) | |
162 | return -EFAULT; | |
163 | return sys_msgrcv (first, tmp.msgp, second, | |
164 | tmp.msgtyp, third); | |
165 | } | |
166 | default: | |
167 | return sys_msgrcv (first, | |
168 | (struct msgbuf __user *) ptr, | |
169 | second, fifth, third); | |
170 | } | |
171 | case MSGGET: | |
172 | return sys_msgget ((key_t) first, second); | |
173 | case MSGCTL: | |
174 | return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); | |
175 | ||
176 | case SHMAT: | |
177 | switch (version) { | |
178 | default: { | |
179 | ulong raddr; | |
180 | ret = do_shmat (first, (char __user *) ptr, second, &raddr); | |
181 | if (ret) | |
182 | return ret; | |
183 | return put_user (raddr, (ulong __user *) third); | |
184 | } | |
185 | case 1: /* iBCS2 emulator entry point */ | |
186 | if (!segment_eq(get_fs(), get_ds())) | |
187 | return -EINVAL; | |
188 | /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */ | |
189 | return do_shmat (first, (char __user *) ptr, second, (ulong *) third); | |
190 | } | |
191 | case SHMDT: | |
192 | return sys_shmdt ((char __user *)ptr); | |
193 | case SHMGET: | |
194 | return sys_shmget (first, second, third); | |
195 | case SHMCTL: | |
196 | return sys_shmctl (first, second, | |
197 | (struct shmid_ds __user *) ptr); | |
198 | default: | |
199 | return -ENOSYS; | |
200 | } | |
201 | } | |
202 | ||
203 | /* | |
204 | * Old cruft | |
205 | */ | |
206 | asmlinkage int sys_uname(struct old_utsname __user * name) | |
207 | { | |
208 | int err; | |
209 | if (!name) | |
210 | return -EFAULT; | |
211 | down_read(&uts_sem); | |
e9ff3990 | 212 | err = copy_to_user(name, utsname(), sizeof (*name)); |
1da177e4 LT |
213 | up_read(&uts_sem); |
214 | return err?-EFAULT:0; | |
215 | } | |
216 | ||
217 | asmlinkage int sys_olduname(struct oldold_utsname __user * name) | |
218 | { | |
219 | int error; | |
220 | ||
221 | if (!name) | |
222 | return -EFAULT; | |
223 | if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) | |
224 | return -EFAULT; | |
225 | ||
226 | down_read(&uts_sem); | |
227 | ||
e9ff3990 SH |
228 | error = __copy_to_user(&name->sysname, &utsname()->sysname, |
229 | __OLD_UTS_LEN); | |
230 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
231 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
232 | __OLD_UTS_LEN); | |
233 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
234 | error |= __copy_to_user(&name->release, &utsname()->release, | |
235 | __OLD_UTS_LEN); | |
236 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
237 | error |= __copy_to_user(&name->version, &utsname()->version, | |
238 | __OLD_UTS_LEN); | |
239 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
240 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
241 | __OLD_UTS_LEN); | |
242 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1da177e4 LT |
243 | |
244 | up_read(&uts_sem); | |
245 | ||
246 | error = error ? -EFAULT : 0; | |
247 | ||
248 | return error; | |
249 | } | |
fe74290d AB |
250 | |
251 | ||
252 | /* | |
253 | * Do a system call from kernel instead of calling sys_execve so we | |
254 | * end up with proper pt_regs. | |
255 | */ | |
256 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
257 | { | |
258 | long __res; | |
259 | asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx" | |
260 | : "=a" (__res) | |
261 | : "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory"); | |
262 | return __res; | |
263 | } |