1/*
2 * linux/arch/m68knommu/kernel/sys_m68k.c
3 *
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/m68k
6 * platform.
7 */
8
9#include <linux/errno.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/smp.h>
13#include <linux/sem.h>
14#include <linux/msg.h>
15#include <linux/shm.h>
16#include <linux/stat.h>
17#include <linux/syscalls.h>
18#include <linux/mman.h>
19#include <linux/file.h>
20#include <linux/utsname.h>
21
22#include <asm/setup.h>
23#include <asm/uaccess.h>
24#include <asm/cachectl.h>
25#include <asm/traps.h>
26#include <asm/ipc.h>
27#include <asm/cacheflush.h>
28#include <asm/unistd.h>
29
30/*
31 * sys_pipe() is the normal C calling standard for creating
32 * a pipe. It's not the way unix traditionally does this, though.
33 */
34asmlinkage int sys_pipe(unsigned long * fildes)
35{
36	int fd[2];
37	int error;
38
39	error = do_pipe(fd);
40	if (!error) {
41		if (copy_to_user(fildes, fd, 2*sizeof(int)))
42			error = -EFAULT;
43	}
44	return error;
45}
46
47/* common code for old and new mmaps */
48static inline long do_mmap2(
49	unsigned long addr, unsigned long len,
50	unsigned long prot, unsigned long flags,
51	unsigned long fd, unsigned long pgoff)
52{
53	int error = -EBADF;
54	struct file * file = NULL;
55
56	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
57	if (!(flags & MAP_ANONYMOUS)) {
58		file = fget(fd);
59		if (!file)
60			goto out;
61	}
62
63	down_write(&current->mm->mmap_sem);
64	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
65	up_write(&current->mm->mmap_sem);
66
67	if (file)
68		fput(file);
69out:
70	return error;
71}
72
73asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
74	unsigned long prot, unsigned long flags,
75	unsigned long fd, unsigned long pgoff)
76{
77	return do_mmap2(addr, len, prot, flags, fd, pgoff);
78}
79
80/*
81 * Perform the select(nd, in, out, ex, tv) and mmap() system
82 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
83 * handle more than 4 system call parameters, so these system calls
84 * used a memory block for parameter passing..
85 */
86
87struct mmap_arg_struct {
88	unsigned long addr;
89	unsigned long len;
90	unsigned long prot;
91	unsigned long flags;
92	unsigned long fd;
93	unsigned long offset;
94};
95
96asmlinkage int old_mmap(struct mmap_arg_struct *arg)
97{
98	struct mmap_arg_struct a;
99	int error = -EFAULT;
100
101	if (copy_from_user(&a, arg, sizeof(a)))
102		goto out;
103
104	error = -EINVAL;
105	if (a.offset & ~PAGE_MASK)
106		goto out;
107
108	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
109
110	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
111out:
112	return error;
113}
114
115struct sel_arg_struct {
116	unsigned long n;
117	fd_set *inp, *outp, *exp;
118	struct timeval *tvp;
119};
120
121asmlinkage int old_select(struct sel_arg_struct *arg)
122{
123	struct sel_arg_struct a;
124
125	if (copy_from_user(&a, arg, sizeof(a)))
126		return -EFAULT;
127	/* sys_select() does the appropriate kernel locking */
128	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
129}
130
131/*
132 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
133 *
134 * This is really horribly ugly.
135 */
136asmlinkage int sys_ipc (uint call, int first, int second,
137			int third, void *ptr, long fifth)
138{
139	int version, ret;
140
141	version = call >> 16; /* hack for backward compatibility */
142	call &= 0xffff;
143
144	if (call <= SEMCTL)
145		switch (call) {
146		case SEMOP:
147			return sys_semop (first, (struct sembuf *)ptr, second);
148		case SEMGET:
149			return sys_semget (first, second, third);
150		case SEMCTL: {
151			union semun fourth;
152			if (!ptr)
153				return -EINVAL;
154			if (get_user(fourth.__pad, (void **) ptr))
155				return -EFAULT;
156			return sys_semctl (first, second, third, fourth);
157			}
158		default:
159			return -EINVAL;
160		}
161	if (call <= MSGCTL)
162		switch (call) {
163		case MSGSND:
164			return sys_msgsnd (first, (struct msgbuf *) ptr,
165					  second, third);
166		case MSGRCV:
167			switch (version) {
168			case 0: {
169				struct ipc_kludge tmp;
170				if (!ptr)
171					return -EINVAL;
172				if (copy_from_user (&tmp,
173						    (struct ipc_kludge *)ptr,
174						    sizeof (tmp)))
175					return -EFAULT;
176				return sys_msgrcv (first, tmp.msgp, second,
177						   tmp.msgtyp, third);
178				}
179			default:
180				return sys_msgrcv (first,
181						   (struct msgbuf *) ptr,
182						   second, fifth, third);
183			}
184		case MSGGET:
185			return sys_msgget ((key_t) first, second);
186		case MSGCTL:
187			return sys_msgctl (first, second,
188					   (struct msqid_ds *) ptr);
189		default:
190			return -EINVAL;
191		}
192	if (call <= SHMCTL)
193		switch (call) {
194		case SHMAT:
195			switch (version) {
196			default: {
197				ulong raddr;
198				ret = do_shmat (first, ptr, second, &raddr);
199				if (ret)
200					return ret;
201				return put_user (raddr, (ulong __user *) third);
202			}
203			}
204		case SHMDT:
205			return sys_shmdt (ptr);
206		case SHMGET:
207			return sys_shmget (first, second, third);
208		case SHMCTL:
209			return sys_shmctl (first, second, ptr);
210		default:
211			return -ENOSYS;
212		}
213
214	return -EINVAL;
215}
216
217/* sys_cacheflush -- flush (part of) the processor cache.  */
218asmlinkage int
219sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
220{
221	flush_cache_all();
222	return(0);
223}
224
225asmlinkage int sys_getpagesize(void)
226{
227	return PAGE_SIZE;
228}
229
230/*
231 * Do a system call from kernel instead of calling sys_execve so we
232 * end up with proper pt_regs.
233 */
234int kernel_execve(const char *filename, char *const argv[], char *const envp[])
235{
236	register long __res asm ("%d0") = __NR_execve;
237	register long __a asm ("%d1") = (long)(filename);
238	register long __b asm ("%d2") = (long)(argv);
239	register long __c asm ("%d3") = (long)(envp);
240	asm volatile ("trap  #0" : "+d" (__res)
241			: "d" (__a), "d" (__b), "d" (__c));
242	return __res;
243}
244