1 /* MN10300 Weird system calls
2 *
3 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11 #include <linux/errno.h>
12 #include <linux/sched.h>
13 #include <linux/syscalls.h>
14 #include <linux/mm.h>
15 #include <linux/smp.h>
16 #include <linux/smp_lock.h>
17 #include <linux/sem.h>
18 #include <linux/msg.h>
19 #include <linux/shm.h>
20 #include <linux/stat.h>
21 #include <linux/mman.h>
22 #include <linux/file.h>
23 #include <linux/utsname.h>
24 #include <linux/syscalls.h>
25 #include <linux/tty.h>
26
27 #include <asm/uaccess.h>
28
29 #define MIN_MAP_ADDR PAGE_SIZE /* minimum fixed mmap address */
30
31 /*
32 * memory mapping syscall
33 */
sys_mmap2(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long pgoff)34 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
35 unsigned long prot, unsigned long flags,
36 unsigned long fd, unsigned long pgoff)
37 {
38 struct file *file = NULL;
39 long error = -EINVAL;
40
41 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
42
43 if (flags & MAP_FIXED && addr < MIN_MAP_ADDR)
44 goto out;
45
46 error = -EBADF;
47 if (!(flags & MAP_ANONYMOUS)) {
48 file = fget(fd);
49 if (!file)
50 goto out;
51 }
52
53 down_write(¤t->mm->mmap_sem);
54 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
55 up_write(¤t->mm->mmap_sem);
56
57 if (file)
58 fput(file);
59 out:
60 return error;
61 }
62
old_mmap(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long offset)63 asmlinkage long old_mmap(unsigned long addr, unsigned long len,
64 unsigned long prot, unsigned long flags,
65 unsigned long fd, unsigned long offset)
66 {
67 if (offset & ~PAGE_MASK)
68 return -EINVAL;
69 return sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
70 }
71
72 struct sel_arg_struct {
73 unsigned long n;
74 fd_set *inp;
75 fd_set *outp;
76 fd_set *exp;
77 struct timeval *tvp;
78 };
79
old_select(struct sel_arg_struct __user * arg)80 asmlinkage int old_select(struct sel_arg_struct __user *arg)
81 {
82 struct sel_arg_struct a;
83
84 if (copy_from_user(&a, arg, sizeof(a)))
85 return -EFAULT;
86 /* sys_select() does the appropriate kernel locking */
87 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
88 }
89
90 /*
91 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
92 *
93 * This is really horribly ugly.
94 */
sys_ipc(uint call,int first,int second,int third,void __user * ptr,long fifth)95 asmlinkage long sys_ipc(uint call, int first, int second,
96 int third, void __user *ptr, long fifth)
97 {
98 int version, ret;
99
100 version = call >> 16; /* hack for backward compatibility */
101 call &= 0xffff;
102
103 switch (call) {
104 case SEMOP:
105 return sys_semtimedop(first, (struct sembuf __user *)ptr,
106 second, NULL);
107 case SEMTIMEDOP:
108 return sys_semtimedop(first, (struct sembuf __user *)ptr,
109 second,
110 (const struct timespec __user *)fifth);
111 case SEMGET:
112 return sys_semget(first, second, third);
113 case SEMCTL: {
114 union semun fourth;
115 if (!ptr)
116 return -EINVAL;
117 if (get_user(fourth.__pad, (void __user * __user *) ptr))
118 return -EFAULT;
119 return sys_semctl(first, second, third, fourth);
120 }
121
122 case MSGSND:
123 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
124 second, third);
125 case MSGRCV:
126 switch (version) {
127 case 0: {
128 struct ipc_kludge tmp;
129 if (!ptr)
130 return -EINVAL;
131
132 if (copy_from_user(&tmp,
133 (struct ipc_kludge __user *) ptr,
134 sizeof(tmp)))
135 return -EFAULT;
136 return sys_msgrcv(first, tmp.msgp, second,
137 tmp.msgtyp, third);
138 }
139 default:
140 return sys_msgrcv(first,
141 (struct msgbuf __user *) ptr,
142 second, fifth, third);
143 }
144 case MSGGET:
145 return sys_msgget((key_t) first, second);
146 case MSGCTL:
147 return sys_msgctl(first, second,
148 (struct msqid_ds __user *) ptr);
149
150 case SHMAT:
151 switch (version) {
152 default: {
153 ulong raddr;
154 ret = do_shmat(first, (char __user *) ptr, second,
155 &raddr);
156 if (ret)
157 return ret;
158 return put_user(raddr, (ulong *) third);
159 }
160 case 1: /* iBCS2 emulator entry point */
161 if (!segment_eq(get_fs(), get_ds()))
162 return -EINVAL;
163 return do_shmat(first, (char __user *) ptr, second,
164 (ulong *) third);
165 }
166 case SHMDT:
167 return sys_shmdt((char __user *)ptr);
168 case SHMGET:
169 return sys_shmget(first, second, third);
170 case SHMCTL:
171 return sys_shmctl(first, second,
172 (struct shmid_ds __user *) ptr);
173 default:
174 return -EINVAL;
175 }
176 }
177