[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / mips / kernel / syscall.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2001 MIPS Technologies, Inc.
 */
#include <linux/a.out.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/mman.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/syscalls.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/utsname.h>
#include <linux/unistd.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/compiler.h>

#include <asm/branch.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
#include <asm/ipc.h>
#include <asm/offset.h>
#include <asm/signal.h>
#include <asm/sim.h>
#include <asm/shmparam.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>

asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs)
{
	int fd[2];
	int error, res;

	error = do_pipe(fd);
	if (error) {
		res = error;
		goto out;
	}
	regs.regs[3] = fd[1];
	res = fd[0];
out:
	return res;
}

unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */

#define COLOUR_ALIGN(addr,pgoff)				\
	((((addr) + shm_align_mask) & ~shm_align_mask) +	\
	 (((pgoff) << PAGE_SHIFT) & shm_align_mask))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct vm_area_struct * vmm;
	int do_color_align;
	unsigned long task_size;

	task_size = STACK_TOP;

	if (flags & MAP_FIXED) {
		/*
		 * We do not accept a shared mapping if it would violate
		 * cache aliasing constraints.
		 */
		if ((flags & MAP_SHARED) && (addr & shm_align_mask))
			return -EINVAL;
		return addr;
	}

	if (len > task_size)
		return -ENOMEM;
	do_color_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_color_align = 1;
	if (addr) {
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
		else
			addr = PAGE_ALIGN(addr);
		vmm = find_vma(current->mm, addr);
		if (task_size - len >= addr &&
		    (!vmm || addr + len <= vmm->vm_start))
			return addr;
	}
	addr = TASK_UNMAPPED_BASE;
	if (do_color_align)
		addr = COLOUR_ALIGN(addr, pgoff);
	else
		addr = PAGE_ALIGN(addr);

	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
		/* At this point:  (!vmm || addr < vmm->vm_end). */
		if (task_size - len < addr)
			return -ENOMEM;
		if (!vmm || addr + len <= vmm->vm_start)
			return addr;
		addr = vmm->vm_end;
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
	}
}

/* common code for old and new mmaps */
static inline unsigned long
do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
        unsigned long flags, unsigned long fd, unsigned long pgoff)
{
	unsigned long error = -EBADF;
	struct file * file = NULL;

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

	down_write(&current->mm->mmap_sem);
	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	up_write(&current->mm->mmap_sem);

	if (file)
		fput(file);
out:
	return error;
}

asmlinkage unsigned long
old_mmap(unsigned long addr, unsigned long len, int prot,
	int flags, int fd, off_t offset)
{
	unsigned long result;

	result = -EINVAL;
	if (offset & ~PAGE_MASK)
		goto out;

	result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);

out:
	return result;
}

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

save_static_function(sys_fork);
__attribute_used__ noinline static int
_sys_fork(nabi_no_regargs struct pt_regs regs)
{
	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
}

save_static_function(sys_clone);
__attribute_used__ noinline static int
_sys_clone(nabi_no_regargs struct pt_regs regs)
{
	unsigned long clone_flags;
	unsigned long newsp;
	int *parent_tidptr, *child_tidptr;

	clone_flags = regs.regs[4];
	newsp = regs.regs[5];
	if (!newsp)
		newsp = regs.regs[29];
	parent_tidptr = (int *) regs.regs[6];
	child_tidptr = (int *) regs.regs[7];
	return do_fork(clone_flags, newsp, &regs, 0,
	               parent_tidptr, child_tidptr);
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
{
	int error;
	char * filename;

	filename = getname((char *) (long)regs.regs[4]);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = do_execve(filename, (char **) (long)regs.regs[5],
	                  (char **) (long)regs.regs[6], &regs);
	putname(filename);

out:
	return error;
}

/*
 * Compacrapability ...
 */
asmlinkage int sys_uname(struct old_utsname * name)
{
	if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
		return 0;
	return -EFAULT;
}

/*
 * Compacrapability ...
 */
asmlinkage int sys_olduname(struct oldold_utsname * name)
{
	int error;

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

	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);
	error = error ? -EFAULT : 0;

	return error;
}

asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3)
{
	int	tmp, len;
	char	*name;

	switch(cmd) {
	case SETNAME: {
		char nodename[__NEW_UTS_LEN + 1];

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		name = (char *) arg1;

		len = strncpy_from_user(nodename, name, __NEW_UTS_LEN);
		if (len < 0)
			return -EFAULT;

		down_write(&uts_sem);
		strncpy(system_utsname.nodename, nodename, len);
		nodename[__NEW_UTS_LEN] = '\0';
		strlcpy(system_utsname.nodename, nodename,
		        sizeof(system_utsname.nodename));
		up_write(&uts_sem);
		return 0;
	}

	case MIPS_ATOMIC_SET:
		printk(KERN_CRIT "How did I get here?\n");
		return -EINVAL;

	case MIPS_FIXADE:
		tmp = current->thread.mflags & ~3;
		current->thread.mflags = tmp | (arg1 & 3);
		return 0;

	case FLUSH_CACHE:
		__flush_cache_all();
		return 0;

	case MIPS_RDNVRAM:
		return -EIO;
	}

	return -EINVAL;
}

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

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

	switch (call) {
	case SEMOP:
		return sys_semtimedop (first, (struct sembuf *)ptr, second,
		                       NULL);
	case SEMTIMEDOP:
		return sys_semtimedop (first, (struct sembuf *)ptr, second,
		                       (const struct timespec __user *)fifth);
	case SEMGET:
		return sys_semget (first, second, third);
	case SEMCTL: {
		union semun fourth;
		if (!ptr)
			return -EINVAL;
		if (get_user(fourth.__pad, (void **) ptr))
			return -EFAULT;
		return sys_semctl (first, second, third, fourth);
	}

	case MSGSND:
		return sys_msgsnd (first, (struct msgbuf *) ptr,
				   second, third);
	case MSGRCV:
		switch (version) {
		case 0: {
			struct ipc_kludge tmp;
			if (!ptr)
				return -EINVAL;

			if (copy_from_user(&tmp,
					   (struct ipc_kludge *) ptr,
					   sizeof (tmp)))
				return -EFAULT;
			return sys_msgrcv (first, tmp.msgp, second,
					   tmp.msgtyp, third);
		}
		default:
			return sys_msgrcv (first,
					   (struct msgbuf *) ptr,
					   second, fifth, third);
		}
	case MSGGET:
		return sys_msgget ((key_t) first, second);
	case MSGCTL:
		return sys_msgctl (first, second, (struct msqid_ds *) ptr);

	case SHMAT:
		switch (version) {
		default: {
			ulong raddr;
			ret = do_shmat (first, (char *) ptr, second, &raddr);
			if (ret)
				return ret;
			return put_user (raddr, (ulong *) third);
		}
		case 1:	/* iBCS2 emulator entry point */
			if (!segment_eq(get_fs(), get_ds()))
				return -EINVAL;
			return do_shmat (first, (char *) ptr, second, (ulong *) third);
		}
	case SHMDT:
		return sys_shmdt ((char *)ptr);
	case SHMGET:
		return sys_shmget (first, second, third);
	case SHMCTL:
		return sys_shmctl (first, second,
				   (struct shmid_ds *) ptr);
	default:
		return -ENOSYS;
	}
}

/*
 * Native ABI that is O32 or N64 version
 */
asmlinkage long sys_shmat(int shmid, char __user *shmaddr,
                          int shmflg, unsigned long *addr)
{
	unsigned long raddr;
	int err;

	err = do_shmat(shmid, shmaddr, shmflg, &raddr);
	if (err)
		return err;

	return put_user(raddr, addr);
}

/*
 * No implemented yet ...
 */
asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
{
	return -ENOSYS;
}

/*
 * If we ever come here the user sp is bad.  Zap the process right away.
 * Due to the bad stack signaling wouldn't work.
 */
asmlinkage void bad_stack(void)
{
	do_exit(SIGSEGV);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	* Copyright (C) 2001 MIPS Technologies, Inc.
	9	*/
	10	#include <linux/a.out.h>
	11	#include <linux/errno.h>
	12	#include <linux/linkage.h>
	13	#include <linux/mm.h>
	14	#include <linux/smp.h>
	15	#include <linux/smp_lock.h>
	16	#include <linux/mman.h>
	17	#include <linux/ptrace.h>
	18	#include <linux/sched.h>
	19	#include <linux/string.h>
	20	#include <linux/syscalls.h>
	21	#include <linux/file.h>
	22	#include <linux/slab.h>
	23	#include <linux/utsname.h>
	24	#include <linux/unistd.h>
	25	#include <linux/sem.h>
	26	#include <linux/msg.h>
	27	#include <linux/shm.h>
	28	#include <linux/compiler.h>
	29
	30	#include <asm/branch.h>
	31	#include <asm/cachectl.h>
	32	#include <asm/cacheflush.h>
	33	#include <asm/ipc.h>
	34	#include <asm/offset.h>
	35	#include <asm/signal.h>
	36	#include <asm/sim.h>
	37	#include <asm/shmparam.h>
	38	#include <asm/sysmips.h>
	39	#include <asm/uaccess.h>
	40
	41	asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs)
	42	{
	43	int fd[2];
	44	int error, res;
	45
	46	error = do_pipe(fd);
	47	if (error) {
	48	res = error;
	49	goto out;
	50	}
	51	regs.regs[3] = fd[1];
	52	res = fd[0];
	53	out:
	54	return res;
	55	}
	56
	57	unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
	58
	59	#define COLOUR_ALIGN(addr,pgoff) \
	60	((((addr) + shm_align_mask) & ~shm_align_mask) + \
	61	(((pgoff) << PAGE_SHIFT) & shm_align_mask))
	62
	63	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	64	unsigned long len, unsigned long pgoff, unsigned long flags)
65	{
66	struct vm_area_struct * vmm;
67	int do_color_align;
68	unsigned long task_size;
69
70	task_size = STACK_TOP;
71
72	if (flags & MAP_FIXED) {
73	/*
74	* We do not accept a shared mapping if it would violate
75	* cache aliasing constraints.
76	*/
77	if ((flags & MAP_SHARED) && (addr & shm_align_mask))
78	return -EINVAL;
79	return addr;
80	}
81
82	if (len > task_size)
83	return -ENOMEM;
84	do_color_align = 0;
85	if (filp \|\| (flags & MAP_SHARED))
86	do_color_align = 1;
87	if (addr) {
88	if (do_color_align)
89	addr = COLOUR_ALIGN(addr, pgoff);
90	else
91	addr = PAGE_ALIGN(addr);
92	vmm = find_vma(current->mm, addr);
93	if (task_size - len >= addr &&
94	(!vmm \|\| addr + len <= vmm->vm_start))
95	return addr;
96	}
97	addr = TASK_UNMAPPED_BASE;
98	if (do_color_align)
99	addr = COLOUR_ALIGN(addr, pgoff);
100	else
101	addr = PAGE_ALIGN(addr);
102
103	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
104	/* At this point: (!vmm \|\| addr < vmm->vm_end). */
105	if (task_size - len < addr)
106	return -ENOMEM;
107	if (!vmm \|\| addr + len <= vmm->vm_start)
108	return addr;
109	addr = vmm->vm_end;
110	if (do_color_align)
111	addr = COLOUR_ALIGN(addr, pgoff);
112	}
113	}
114
115	/* common code for old and new mmaps */
116	static inline unsigned long
117	do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
118	unsigned long flags, unsigned long fd, unsigned long pgoff)
119	{
120	unsigned long error = -EBADF;
121	struct file * file = NULL;
122
123	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
124	if (!(flags & MAP_ANONYMOUS)) {
125	file = fget(fd);
126	if (!file)
127	goto out;
128	}
129
130	down_write(&current->mm->mmap_sem);
131	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
132	up_write(&current->mm->mmap_sem);
133
134	if (file)
135	fput(file);
136	out:
137	return error;
138	}
139
140	asmlinkage unsigned long
141	old_mmap(unsigned long addr, unsigned long len, int prot,
142	int flags, int fd, off_t offset)
143	{
144	unsigned long result;
145
146	result = -EINVAL;
147	if (offset & ~PAGE_MASK)
148	goto out;
149
150	result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
151
152	out:
153	return result;
154	}
155
156	asmlinkage unsigned long
157	sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
158	unsigned long flags, unsigned long fd, unsigned long pgoff)
159	{
160	return do_mmap2(addr, len, prot, flags, fd, pgoff);
161	}
162
163	save_static_function(sys_fork);
164	__attribute_used__ noinline static int
165	_sys_fork(nabi_no_regargs struct pt_regs regs)
166	{
167	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
168	}
169
170	save_static_function(sys_clone);
171	__attribute_used__ noinline static int
172	_sys_clone(nabi_no_regargs struct pt_regs regs)
173	{
174	unsigned long clone_flags;
175	unsigned long newsp;
176	int parent_tidptr, child_tidptr;
177
178	clone_flags = regs.regs[4];
179	newsp = regs.regs[5];
180	if (!newsp)
181	newsp = regs.regs[29];
182	parent_tidptr = (int *) regs.regs[6];
183	child_tidptr = (int *) regs.regs[7];
184	return do_fork(clone_flags, newsp, &regs, 0,
185	parent_tidptr, child_tidptr);
186	}
187
188	/*
189	* sys_execve() executes a new program.
190	*/
191	asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
192	{
193	int error;
194	char * filename;
195
196	filename = getname((char *) (long)regs.regs[4]);
197	error = PTR_ERR(filename);
198	if (IS_ERR(filename))
199	goto out;
200	error = do_execve(filename, (char **) (long)regs.regs[5],
201	(char **) (long)regs.regs[6], &regs);
202	putname(filename);
203
204	out:
205	return error;
206	}
207
208	/*
209	* Compacrapability ...
210	*/
211	asmlinkage int sys_uname(struct old_utsname * name)
212	{
213	if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
214	return 0;
215	return -EFAULT;
216	}
217
218	/*
219	* Compacrapability ...
220	*/
221	asmlinkage int sys_olduname(struct oldold_utsname * name)
222	{
223	int error;
224
225	if (!name)
226	return -EFAULT;
227	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
228	return -EFAULT;
229
230	error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
231	error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
232	error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
233	error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
234	error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
235	error -= __put_user(0,name->release+__OLD_UTS_LEN);
236	error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
237	error -= __put_user(0,name->version+__OLD_UTS_LEN);
238	error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
239	error = __put_user(0,name->machine+__OLD_UTS_LEN);
240	error = error ? -EFAULT : 0;
241
242	return error;
243	}
244
245	asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3)
246	{
247	int tmp, len;
248	char *name;
249
250	switch(cmd) {
251	case SETNAME: {
252	char nodename[__NEW_UTS_LEN + 1];
253
254	if (!capable(CAP_SYS_ADMIN))
255	return -EPERM;
256
257	name = (char *) arg1;
258
259	len = strncpy_from_user(nodename, name, __NEW_UTS_LEN);
260	if (len < 0)
261	return -EFAULT;
262
263	down_write(&uts_sem);
264	strncpy(system_utsname.nodename, nodename, len);
265	nodename[__NEW_UTS_LEN] = '\0';
266	strlcpy(system_utsname.nodename, nodename,
267	sizeof(system_utsname.nodename));
268	up_write(&uts_sem);
269	return 0;
270	}
271
272	case MIPS_ATOMIC_SET:
273	printk(KERN_CRIT "How did I get here?\n");
274	return -EINVAL;
275
276	case MIPS_FIXADE:
277	tmp = current->thread.mflags & ~3;
278	current->thread.mflags = tmp \| (arg1 & 3);
279	return 0;
280
281	case FLUSH_CACHE:
282	__flush_cache_all();
283	return 0;
284
285	case MIPS_RDNVRAM:
286	return -EIO;
287	}
288
289	return -EINVAL;
290	}
291
292	/*
293	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
294	*
295	* This is really horribly ugly.
296	*/
297	asmlinkage int sys_ipc (uint call, int first, int second,
298	unsigned long third, void *ptr, long fifth)
299	{
300	int version, ret;
301
302	version = call >> 16; /* hack for backward compatibility */
303	call &= 0xffff;
304
305	switch (call) {
306	case SEMOP:
307	return sys_semtimedop (first, (struct sembuf *)ptr, second,
308	NULL);
309	case SEMTIMEDOP:
310	return sys_semtimedop (first, (struct sembuf *)ptr, second,
311	(const struct timespec __user *)fifth);
312	case SEMGET:
313	return sys_semget (first, second, third);
314	case SEMCTL: {
315	union semun fourth;
316	if (!ptr)
317	return -EINVAL;
318	if (get_user(fourth.__pad, (void **) ptr))
319	return -EFAULT;
320	return sys_semctl (first, second, third, fourth);
321	}
322
323	case MSGSND:
324	return sys_msgsnd (first, (struct msgbuf *) ptr,
325	second, third);
326	case MSGRCV:
327	switch (version) {
328	case 0: {
329	struct ipc_kludge tmp;
330	if (!ptr)
331	return -EINVAL;
332
333	if (copy_from_user(&tmp,
334	(struct ipc_kludge *) ptr,
335	sizeof (tmp)))
336	return -EFAULT;
337	return sys_msgrcv (first, tmp.msgp, second,
338	tmp.msgtyp, third);
339	}
340	default:
341	return sys_msgrcv (first,
342	(struct msgbuf *) ptr,
343	second, fifth, third);
344	}
345	case MSGGET:
346	return sys_msgget ((key_t) first, second);
347	case MSGCTL:
348	return sys_msgctl (first, second, (struct msqid_ds *) ptr);
349
350	case SHMAT:
351	switch (version) {
352	default: {
353	ulong raddr;
354	ret = do_shmat (first, (char *) ptr, second, &raddr);
355	if (ret)
356	return ret;
357	return put_user (raddr, (ulong *) third);
358	}
359	case 1: /* iBCS2 emulator entry point */
360	if (!segment_eq(get_fs(), get_ds()))
361	return -EINVAL;
362	return do_shmat (first, (char ) ptr, second, (ulong ) third);
363	}
364	case SHMDT:
365	return sys_shmdt ((char *)ptr);
366	case SHMGET:
367	return sys_shmget (first, second, third);
368	case SHMCTL:
369	return sys_shmctl (first, second,
370	(struct shmid_ds *) ptr);
371	default:
372	return -ENOSYS;
373	}
374	}
375
376	/*
377	* Native ABI that is O32 or N64 version
378	*/
379	asmlinkage long sys_shmat(int shmid, char __user *shmaddr,
380	int shmflg, unsigned long *addr)
381	{
382	unsigned long raddr;
383	int err;
384
385	err = do_shmat(shmid, shmaddr, shmflg, &raddr);
386	if (err)
387	return err;
388
389	return put_user(raddr, addr);
390	}
391
392	/*
393	* No implemented yet ...
394	*/
395	asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
396	{
397	return -ENOSYS;
398	}
399
400	/*
401	* If we ever come here the user sp is bad. Zap the process right away.
402	* Due to the bad stack signaling wouldn't work.
403	*/
404	asmlinkage void bad_stack(void)
405	{
406	do_exit(SIGSEGV);
407	}