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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/sys_s390.c | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), | |
7 | * Thomas Spatzier (tspat@de.ibm.com) | |
8 | * | |
9 | * Derived from "arch/i386/kernel/sys_i386.c" | |
10 | * | |
11 | * This file contains various random system calls that | |
12 | * have a non-standard calling sequence on the Linux/s390 | |
13 | * platform. | |
14 | */ | |
15 | ||
16 | #include <linux/errno.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/mm.h> | |
4e950f6f | 19 | #include <linux/fs.h> |
1da177e4 | 20 | #include <linux/smp.h> |
1da177e4 LT |
21 | #include <linux/sem.h> |
22 | #include <linux/msg.h> | |
23 | #include <linux/shm.h> | |
24 | #include <linux/stat.h> | |
25 | #include <linux/syscalls.h> | |
26 | #include <linux/mman.h> | |
27 | #include <linux/file.h> | |
28 | #include <linux/utsname.h> | |
1da177e4 | 29 | #include <linux/personality.h> |
fe74290d | 30 | #include <linux/unistd.h> |
1da177e4 LT |
31 | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/ipc.h> | |
34 | ||
35 | /* | |
36 | * sys_pipe() is the normal C calling standard for creating | |
37 | * a pipe. It's not the way Unix traditionally does this, though. | |
38 | */ | |
39 | asmlinkage long sys_pipe(unsigned long __user *fildes) | |
40 | { | |
41 | int fd[2]; | |
42 | int error; | |
43 | ||
44 | error = do_pipe(fd); | |
45 | if (!error) { | |
46 | if (copy_to_user(fildes, fd, 2*sizeof(int))) | |
47 | error = -EFAULT; | |
48 | } | |
49 | return error; | |
50 | } | |
51 | ||
52 | /* common code for old and new mmaps */ | |
53 | static inline long do_mmap2( | |
54 | unsigned long addr, unsigned long len, | |
55 | unsigned long prot, unsigned long flags, | |
56 | unsigned long fd, unsigned long pgoff) | |
57 | { | |
58 | long error = -EBADF; | |
59 | struct file * file = NULL; | |
60 | ||
61 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
62 | if (!(flags & MAP_ANONYMOUS)) { | |
63 | file = fget(fd); | |
64 | if (!file) | |
65 | goto out; | |
66 | } | |
67 | ||
68 | down_write(¤t->mm->mmap_sem); | |
69 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
70 | up_write(¤t->mm->mmap_sem); | |
71 | ||
72 | if (file) | |
73 | fput(file); | |
74 | out: | |
75 | return error; | |
76 | } | |
77 | ||
78 | /* | |
79 | * Perform the select(nd, in, out, ex, tv) and mmap() system | |
80 | * calls. Linux for S/390 isn't able to handle more than 5 | |
81 | * system call parameters, so these system calls used a memory | |
82 | * block for parameter passing.. | |
83 | */ | |
84 | ||
85 | struct mmap_arg_struct { | |
86 | unsigned long addr; | |
87 | unsigned long len; | |
88 | unsigned long prot; | |
89 | unsigned long flags; | |
90 | unsigned long fd; | |
91 | unsigned long offset; | |
92 | }; | |
93 | ||
94 | asmlinkage long sys_mmap2(struct mmap_arg_struct __user *arg) | |
95 | { | |
96 | struct mmap_arg_struct a; | |
97 | int error = -EFAULT; | |
98 | ||
99 | if (copy_from_user(&a, arg, sizeof(a))) | |
100 | goto out; | |
101 | error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); | |
102 | out: | |
103 | return error; | |
104 | } | |
105 | ||
106 | asmlinkage long old_mmap(struct mmap_arg_struct __user *arg) | |
107 | { | |
108 | struct mmap_arg_struct a; | |
109 | long error = -EFAULT; | |
110 | ||
111 | if (copy_from_user(&a, arg, sizeof(a))) | |
112 | goto out; | |
113 | ||
114 | error = -EINVAL; | |
115 | if (a.offset & ~PAGE_MASK) | |
116 | goto out; | |
117 | ||
118 | error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); | |
119 | out: | |
120 | return error; | |
121 | } | |
122 | ||
347a8dc3 | 123 | #ifndef CONFIG_64BIT |
1da177e4 LT |
124 | struct sel_arg_struct { |
125 | unsigned long n; | |
793af244 AV |
126 | fd_set __user *inp, *outp, *exp; |
127 | struct timeval __user *tvp; | |
1da177e4 LT |
128 | }; |
129 | ||
130 | asmlinkage long old_select(struct sel_arg_struct __user *arg) | |
131 | { | |
132 | struct sel_arg_struct a; | |
133 | ||
134 | if (copy_from_user(&a, arg, sizeof(a))) | |
135 | return -EFAULT; | |
136 | /* sys_select() does the appropriate kernel locking */ | |
137 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); | |
138 | ||
139 | } | |
347a8dc3 | 140 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
141 | |
142 | /* | |
143 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
144 | * | |
145 | * This is really horribly ugly. | |
146 | */ | |
147 | asmlinkage long sys_ipc(uint call, int first, unsigned long second, | |
148 | unsigned long third, void __user *ptr) | |
149 | { | |
150 | struct ipc_kludge tmp; | |
151 | int ret; | |
152 | ||
153 | switch (call) { | |
154 | case SEMOP: | |
155 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
156 | (unsigned)second, NULL); | |
157 | case SEMTIMEDOP: | |
158 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
159 | (unsigned)second, | |
160 | (const struct timespec __user *) third); | |
161 | case SEMGET: | |
162 | return sys_semget(first, (int)second, third); | |
163 | case SEMCTL: { | |
164 | union semun fourth; | |
165 | if (!ptr) | |
166 | return -EINVAL; | |
167 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) | |
168 | return -EFAULT; | |
169 | return sys_semctl(first, (int)second, third, fourth); | |
170 | } | |
171 | case MSGSND: | |
172 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
173 | (size_t)second, third); | |
174 | break; | |
175 | case MSGRCV: | |
176 | if (!ptr) | |
177 | return -EINVAL; | |
178 | if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr, | |
179 | sizeof (struct ipc_kludge))) | |
180 | return -EFAULT; | |
181 | return sys_msgrcv (first, tmp.msgp, | |
182 | (size_t)second, tmp.msgtyp, third); | |
183 | case MSGGET: | |
184 | return sys_msgget((key_t)first, (int)second); | |
185 | case MSGCTL: | |
186 | return sys_msgctl(first, (int)second, | |
187 | (struct msqid_ds __user *)ptr); | |
188 | ||
189 | case SHMAT: { | |
190 | ulong raddr; | |
191 | ret = do_shmat(first, (char __user *)ptr, | |
192 | (int)second, &raddr); | |
193 | if (ret) | |
194 | return ret; | |
195 | return put_user (raddr, (ulong __user *) third); | |
196 | break; | |
197 | } | |
198 | case SHMDT: | |
199 | return sys_shmdt ((char __user *)ptr); | |
200 | case SHMGET: | |
201 | return sys_shmget(first, (size_t)second, third); | |
202 | case SHMCTL: | |
203 | return sys_shmctl(first, (int)second, | |
204 | (struct shmid_ds __user *) ptr); | |
205 | default: | |
206 | return -ENOSYS; | |
207 | ||
208 | } | |
209 | ||
210 | return -EINVAL; | |
211 | } | |
212 | ||
347a8dc3 | 213 | #ifdef CONFIG_64BIT |
1da177e4 LT |
214 | asmlinkage long s390x_newuname(struct new_utsname __user *name) |
215 | { | |
216 | int ret = sys_newuname(name); | |
217 | ||
218 | if (current->personality == PER_LINUX32 && !ret) { | |
219 | ret = copy_to_user(name->machine, "s390\0\0\0\0", 8); | |
220 | if (ret) ret = -EFAULT; | |
221 | } | |
222 | return ret; | |
223 | } | |
224 | ||
225 | asmlinkage long s390x_personality(unsigned long personality) | |
226 | { | |
227 | int ret; | |
228 | ||
229 | if (current->personality == PER_LINUX32 && personality == PER_LINUX) | |
230 | personality = PER_LINUX32; | |
231 | ret = sys_personality(personality); | |
232 | if (ret == PER_LINUX32) | |
233 | ret = PER_LINUX; | |
234 | ||
235 | return ret; | |
236 | } | |
347a8dc3 | 237 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
238 | |
239 | /* | |
240 | * Wrapper function for sys_fadvise64/fadvise64_64 | |
241 | */ | |
347a8dc3 | 242 | #ifndef CONFIG_64BIT |
1da177e4 LT |
243 | |
244 | asmlinkage long | |
245 | s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice) | |
246 | { | |
247 | return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low, | |
248 | len, advice); | |
249 | } | |
250 | ||
251 | #endif | |
252 | ||
253 | struct fadvise64_64_args { | |
254 | int fd; | |
255 | long long offset; | |
256 | long long len; | |
257 | int advice; | |
258 | }; | |
259 | ||
260 | asmlinkage long | |
261 | s390_fadvise64_64(struct fadvise64_64_args __user *args) | |
262 | { | |
263 | struct fadvise64_64_args a; | |
264 | ||
265 | if ( copy_from_user(&a, args, sizeof(a)) ) | |
266 | return -EFAULT; | |
267 | return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); | |
268 | } | |
7a8e0c8d MS |
269 | |
270 | #ifndef CONFIG_64BIT | |
271 | /* | |
272 | * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last | |
273 | * 64 bit argument "len" is split into the upper and lower 32 bits. The | |
274 | * system call wrapper in the user space loads the value to %r6/%r7. | |
275 | * The code in entry.S keeps the values in %r2 - %r6 where they are and | |
276 | * stores %r7 to 96(%r15). But the standard C linkage requires that | |
277 | * the whole 64 bit value for len is stored on the stack and doesn't | |
278 | * use %r6 at all. So s390_fallocate has to convert the arguments from | |
279 | * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len | |
280 | * to | |
281 | * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len | |
282 | */ | |
283 | asmlinkage long s390_fallocate(int fd, int mode, loff_t offset, | |
284 | u32 len_high, u32 len_low) | |
285 | { | |
286 | return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low); | |
287 | } | |
288 | #endif |