summaryrefslogtreecommitdiffstats
path: root/arch/ppc/kernel/syscalls.c
blob: 124313ce3c09055fe8ce73d680bc190196b08033 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
/*
 * arch/ppc/kernel/sys_ppc.c
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 * Derived from "arch/i386/kernel/sys_i386.c"
 * Adapted from the i386 version by Gary Thomas
 * Modified by Cort Dougan (cort@cs.nmt.edu)
 * and Paul Mackerras (paulus@cs.anu.edu.au).
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/PPC
 * platform.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/sys.h>
#include <linux/ipc.h>
#include <linux/utsname.h>
#include <linux/file.h>
#include <linux/unistd.h>

#include <asm/uaccess.h>
#include <asm/ipc.h>
#include <asm/semaphore.h>

void
check_bugs(void)
{
}

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */
int
sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
{
	int version, ret;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	ret = -ENOSYS;
	switch (call) {
	case SEMOP:
		ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
				      second, NULL);
		break;
	case SEMTIMEDOP:
		ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
				      second, (const struct timespec __user *) fifth);
		break;
	case SEMGET:
		ret = sys_semget (first, second, third);
		break;
	case SEMCTL: {
		union semun fourth;

		if (!ptr)
			break;
		if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
		    || (ret = get_user(fourth.__pad, (void __user *__user *)ptr)))
			break;
		ret = sys_semctl (first, second, third, fourth);
		break;
		}
	case MSGSND:
		ret = sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third);
		break;
	case MSGRCV:
		switch (version) {
		case 0: {
			struct ipc_kludge tmp;

			if (!ptr)
				break;
			if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
			    || (ret = copy_from_user(&tmp,
					(struct ipc_kludge __user *) ptr,
					sizeof (tmp)) ? -EFAULT : 0))
				break;
			ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
					  third);
			break;
			}
		default:
			ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
					  second, fifth, third);
			break;
		}
		break;
	case MSGGET:
		ret = sys_msgget ((key_t) first, second);
		break;
	case MSGCTL:
		ret = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
		break;
	case SHMAT: {
		ulong raddr;

		if ((ret = access_ok(VERIFY_WRITE, (ulong __user *) third,
				       sizeof(ulong)) ? 0 : -EFAULT))
			break;
		ret = do_shmat (first, (char __user *) ptr, second, &raddr);
		if (ret)
			break;
		ret = put_user (raddr, (ulong __user *) third);
		break;
		}
	case SHMDT:
		ret = sys_shmdt ((char __user *)ptr);
		break;
	case SHMGET:
		ret = sys_shmget (first, second, third);
		break;
	case SHMCTL:
		ret = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
		break;
	}

	return ret;
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
int sys_pipe(int __user *fildes)
{
	int fd[2];
	int error;

	error = do_pipe(fd);
	if (!error) {
		if (copy_to_user(fildes, fd, 2*sizeof(int)))
			error = -EFAULT;
	}
	return error;
}

static inline unsigned long
do_mmap2(unsigned long addr, size_t len,
	 unsigned long prot, unsigned long flags,
	 unsigned long fd, unsigned long pgoff)
{
	struct file * file = NULL;
	int ret = -EBADF;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (!(flags & MAP_ANONYMOUS)) {
		if (!(file = fget(fd)))
			goto out;
	}

	down_write(&current->mm->mmap_sem);
	ret = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	up_write(&current->mm->mmap_sem);
	if (file)
		fput(file);
out:
	return ret;
}

unsigned long sys_mmap2(unsigned long addr, size_t len,
			unsigned long prot, unsigned long flags,
			unsigned long fd, unsigned long pgoff)
{
	return do_mmap2(addr, len, prot, flags, fd, pgoff);
}

unsigned long sys_mmap(unsigned long addr, size_t len,
		       unsigned long prot, unsigned long flags,
		       unsigned long fd, off_t offset)
{
	int err = -EINVAL;

	if (offset & ~PAGE_MASK)
		goto out;

	err = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
out:
	return err;
}

/*
 * Due to some executables calling the wrong select we sometimes
 * get wrong args.  This determines how the args are being passed
 * (a single ptr to them all args passed) then calls
 * sys_select() with the appropriate args. -- Cort
 */
int
ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
{
	if ( (unsigned long)n >= 4096 )
	{
		unsigned long __user *buffer = (unsigned long __user *)n;
		if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
		    || __get_user(n, buffer)
		    || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
		    || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
		    || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
		    || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
			return -EFAULT;
	}
	return sys_select(n, inp, outp, exp, tvp);
}

int sys_uname(struct old_utsname __user * name)
{
	int err = -EFAULT;

	down_read(&uts_sem);
	if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
		err = 0;
	up_read(&uts_sem);
	return err;
}

int sys_olduname(struct oldold_utsname __user * name)
{
	int error;

	if (!name)
		return -EFAULT;
	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
		return -EFAULT;

	down_read(&uts_sem);
	error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
	error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
	error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
	error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
	error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
	error -= __put_user(0,name->release+__OLD_UTS_LEN);
	error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
	error -= __put_user(0,name->version+__OLD_UTS_LEN);
	error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
	error = __put_user(0,name->machine+__OLD_UTS_LEN);
	up_read(&uts_sem);

	error = error ? -EFAULT : 0;
	return error;
}

/*
 * We put the arguments in a different order so we only use 6
 * registers for arguments, rather than 7 as sys_fadvise64_64 needs
 * (because `offset' goes in r5/r6).
 */
long ppc_fadvise64_64(int fd, int advice, loff_t offset, loff_t len)
{
	return sys_fadvise64_64(fd, offset, len, advice);
}