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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> |
cba4fbbf | 31 | #include <linux/ipc.h> |
26689452 | 32 | #include <linux/syscalls.h> |
1da177e4 | 33 | #include <asm/uaccess.h> |
a806170e | 34 | #include "entry.h" |
1da177e4 | 35 | |
1da177e4 LT |
36 | /* common code for old and new mmaps */ |
37 | static inline long do_mmap2( | |
38 | unsigned long addr, unsigned long len, | |
39 | unsigned long prot, unsigned long flags, | |
40 | unsigned long fd, unsigned long pgoff) | |
41 | { | |
42 | long error = -EBADF; | |
43 | struct file * file = NULL; | |
44 | ||
45 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
46 | if (!(flags & MAP_ANONYMOUS)) { | |
47 | file = fget(fd); | |
48 | if (!file) | |
49 | goto out; | |
50 | } | |
51 | ||
52 | down_write(¤t->mm->mmap_sem); | |
53 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
54 | up_write(¤t->mm->mmap_sem); | |
55 | ||
56 | if (file) | |
57 | fput(file); | |
58 | out: | |
59 | return error; | |
60 | } | |
61 | ||
62 | /* | |
63 | * Perform the select(nd, in, out, ex, tv) and mmap() system | |
64 | * calls. Linux for S/390 isn't able to handle more than 5 | |
65 | * system call parameters, so these system calls used a memory | |
66 | * block for parameter passing.. | |
67 | */ | |
68 | ||
69 | struct mmap_arg_struct { | |
70 | unsigned long addr; | |
71 | unsigned long len; | |
72 | unsigned long prot; | |
73 | unsigned long flags; | |
74 | unsigned long fd; | |
75 | unsigned long offset; | |
76 | }; | |
77 | ||
26689452 | 78 | SYSCALL_DEFINE1(mmap2, struct mmap_arg_struct __user *, arg) |
1da177e4 LT |
79 | { |
80 | struct mmap_arg_struct a; | |
81 | int error = -EFAULT; | |
82 | ||
83 | if (copy_from_user(&a, arg, sizeof(a))) | |
84 | goto out; | |
85 | error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); | |
86 | out: | |
87 | return error; | |
88 | } | |
89 | ||
26689452 | 90 | SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct __user *, arg) |
1da177e4 LT |
91 | { |
92 | struct mmap_arg_struct a; | |
93 | long error = -EFAULT; | |
94 | ||
95 | if (copy_from_user(&a, arg, sizeof(a))) | |
96 | goto out; | |
97 | ||
98 | error = -EINVAL; | |
99 | if (a.offset & ~PAGE_MASK) | |
100 | goto out; | |
101 | ||
102 | error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); | |
103 | out: | |
104 | return error; | |
105 | } | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
109 | * | |
110 | * This is really horribly ugly. | |
111 | */ | |
26689452 HC |
112 | SYSCALL_DEFINE5(ipc, uint, call, int, first, unsigned long, second, |
113 | unsigned long, third, void __user *, ptr) | |
1da177e4 LT |
114 | { |
115 | struct ipc_kludge tmp; | |
116 | int ret; | |
117 | ||
118 | switch (call) { | |
119 | case SEMOP: | |
120 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
121 | (unsigned)second, NULL); | |
122 | case SEMTIMEDOP: | |
123 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
124 | (unsigned)second, | |
125 | (const struct timespec __user *) third); | |
126 | case SEMGET: | |
127 | return sys_semget(first, (int)second, third); | |
128 | case SEMCTL: { | |
129 | union semun fourth; | |
130 | if (!ptr) | |
131 | return -EINVAL; | |
132 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) | |
133 | return -EFAULT; | |
134 | return sys_semctl(first, (int)second, third, fourth); | |
135 | } | |
136 | case MSGSND: | |
137 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
138 | (size_t)second, third); | |
139 | break; | |
140 | case MSGRCV: | |
141 | if (!ptr) | |
142 | return -EINVAL; | |
143 | if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr, | |
144 | sizeof (struct ipc_kludge))) | |
145 | return -EFAULT; | |
146 | return sys_msgrcv (first, tmp.msgp, | |
147 | (size_t)second, tmp.msgtyp, third); | |
148 | case MSGGET: | |
149 | return sys_msgget((key_t)first, (int)second); | |
150 | case MSGCTL: | |
151 | return sys_msgctl(first, (int)second, | |
152 | (struct msqid_ds __user *)ptr); | |
153 | ||
154 | case SHMAT: { | |
155 | ulong raddr; | |
156 | ret = do_shmat(first, (char __user *)ptr, | |
157 | (int)second, &raddr); | |
158 | if (ret) | |
159 | return ret; | |
160 | return put_user (raddr, (ulong __user *) third); | |
161 | break; | |
162 | } | |
163 | case SHMDT: | |
164 | return sys_shmdt ((char __user *)ptr); | |
165 | case SHMGET: | |
166 | return sys_shmget(first, (size_t)second, third); | |
167 | case SHMCTL: | |
168 | return sys_shmctl(first, (int)second, | |
169 | (struct shmid_ds __user *) ptr); | |
170 | default: | |
171 | return -ENOSYS; | |
172 | ||
173 | } | |
174 | ||
175 | return -EINVAL; | |
176 | } | |
177 | ||
347a8dc3 | 178 | #ifdef CONFIG_64BIT |
26689452 | 179 | SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name) |
1da177e4 LT |
180 | { |
181 | int ret = sys_newuname(name); | |
182 | ||
d2f019fe | 183 | if (personality(current->personality) == PER_LINUX32 && !ret) { |
1da177e4 LT |
184 | ret = copy_to_user(name->machine, "s390\0\0\0\0", 8); |
185 | if (ret) ret = -EFAULT; | |
186 | } | |
187 | return ret; | |
188 | } | |
189 | ||
26689452 | 190 | SYSCALL_DEFINE1(s390_personality, unsigned long, personality) |
1da177e4 LT |
191 | { |
192 | int ret; | |
193 | ||
194 | if (current->personality == PER_LINUX32 && personality == PER_LINUX) | |
195 | personality = PER_LINUX32; | |
196 | ret = sys_personality(personality); | |
197 | if (ret == PER_LINUX32) | |
198 | ret = PER_LINUX; | |
199 | ||
200 | return ret; | |
201 | } | |
347a8dc3 | 202 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
203 | |
204 | /* | |
205 | * Wrapper function for sys_fadvise64/fadvise64_64 | |
206 | */ | |
347a8dc3 | 207 | #ifndef CONFIG_64BIT |
1da177e4 | 208 | |
26689452 HC |
209 | SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low, |
210 | size_t, len, int, advice) | |
1da177e4 LT |
211 | { |
212 | return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low, | |
213 | len, advice); | |
214 | } | |
215 | ||
1da177e4 LT |
216 | struct fadvise64_64_args { |
217 | int fd; | |
218 | long long offset; | |
219 | long long len; | |
220 | int advice; | |
221 | }; | |
222 | ||
26689452 | 223 | SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args) |
1da177e4 LT |
224 | { |
225 | struct fadvise64_64_args a; | |
226 | ||
227 | if ( copy_from_user(&a, args, sizeof(a)) ) | |
228 | return -EFAULT; | |
229 | return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); | |
230 | } | |
7a8e0c8d | 231 | |
7a8e0c8d MS |
232 | /* |
233 | * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last | |
234 | * 64 bit argument "len" is split into the upper and lower 32 bits. The | |
235 | * system call wrapper in the user space loads the value to %r6/%r7. | |
236 | * The code in entry.S keeps the values in %r2 - %r6 where they are and | |
237 | * stores %r7 to 96(%r15). But the standard C linkage requires that | |
238 | * the whole 64 bit value for len is stored on the stack and doesn't | |
239 | * use %r6 at all. So s390_fallocate has to convert the arguments from | |
240 | * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len | |
241 | * to | |
242 | * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len | |
243 | */ | |
26689452 | 244 | SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset, |
7a8e0c8d MS |
245 | u32 len_high, u32 len_low) |
246 | { | |
247 | return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low); | |
248 | } | |
26689452 HC |
249 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
250 | asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset, | |
251 | long len_high, long len_low) | |
252 | { | |
253 | return SYSC_s390_fallocate((int) fd, (int) mode, offset, | |
254 | (u32) len_high, (u32) len_low); | |
255 | } | |
256 | SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate); | |
257 | #endif | |
258 | ||
7a8e0c8d | 259 | #endif |