[linux-2.6-block.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 <linux/module.h>

#include <asm/branch.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
#include <asm/ipc.h>
#include <asm/asm-offsets.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 */

EXPORT_SYMBOL(shm_align_mask);

#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;
	}
}

/*
 * 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>
9ff77c46	29	#include <linux/module.h>
1da177e4 LT	30
	31	#include <asm/branch.h>
	32	#include <asm/cachectl.h>
	33	#include <asm/cacheflush.h>
	34	#include <asm/ipc.h>
048eb582	35	#include <asm/asm-offsets.h>
1da177e4 LT	36	#include <asm/signal.h>
	37	#include <asm/sim.h>
	38	#include <asm/shmparam.h>
	39	#include <asm/sysmips.h>
	40	#include <asm/uaccess.h>
	41
	42	asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs)
	43	{
	44	int fd[2];
	45	int error, res;
	46
	47	error = do_pipe(fd);
	48	if (error) {
	49	res = error;
	50	goto out;
	51	}
	52	regs.regs[3] = fd[1];
	53	res = fd[0];
	54	out:
	55	return res;
	56	}
	57
	58	unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
	59
9ff77c46 RB	60	EXPORT_SYMBOL(shm_align_mask);
9ff77c46 RB	61
1da177e4 LT	62	#define COLOUR_ALIGN(addr,pgoff) \
	63	((((addr) + shm_align_mask) & ~shm_align_mask) + \
	64	(((pgoff) << PAGE_SHIFT) & shm_align_mask))
	65
	66	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	67	unsigned long len, unsigned long pgoff, unsigned long flags)
	68	{
	69	struct vm_area_struct * vmm;
	70	int do_color_align;
	71	unsigned long task_size;
	72
	73	task_size = STACK_TOP;
	74
	75	if (flags & MAP_FIXED) {
	76	/*
	77	* We do not accept a shared mapping if it would violate
	78	* cache aliasing constraints.
	79	*/
	80	if ((flags & MAP_SHARED) && (addr & shm_align_mask))
	81	return -EINVAL;
	82	return addr;
	83	}
	84
	85	if (len > task_size)
	86	return -ENOMEM;
	87	do_color_align = 0;
	88	if (filp \|\| (flags & MAP_SHARED))
	89	do_color_align = 1;
	90	if (addr) {
	91	if (do_color_align)
	92	addr = COLOUR_ALIGN(addr, pgoff);
	93	else
	94	addr = PAGE_ALIGN(addr);
	95	vmm = find_vma(current->mm, addr);
	96	if (task_size - len >= addr &&
	97	(!vmm \|\| addr + len <= vmm->vm_start))
	98	return addr;
	99	}
	100	addr = TASK_UNMAPPED_BASE;
	101	if (do_color_align)
	102	addr = COLOUR_ALIGN(addr, pgoff);
	103	else
	104	addr = PAGE_ALIGN(addr);
	105
	106	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
	107	/* At this point: (!vmm \|\| addr < vmm->vm_end). */
	108	if (task_size - len < addr)
	109	return -ENOMEM;
	110	if (!vmm \|\| addr + len <= vmm->vm_start)
	111	return addr;
	112	addr = vmm->vm_end;
	113	if (do_color_align)
	114	addr = COLOUR_ALIGN(addr, pgoff);
	115	}
	116	}
	117
	118	/* common code for old and new mmaps */
	119	static inline unsigned long
	120	do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
	121	unsigned long flags, unsigned long fd, unsigned long pgoff)
	122	{
	123	unsigned long error = -EBADF;
	124	struct file * file = NULL;
	125
126	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
127	if (!(flags & MAP_ANONYMOUS)) {
128	file = fget(fd);
129	if (!file)
130	goto out;
131	}
132
133	down_write(&current->mm->mmap_sem);
134	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
135	up_write(&current->mm->mmap_sem);
136
137	if (file)
138	fput(file);
139	out:
140	return error;
141	}
142
143	asmlinkage unsigned long
144	old_mmap(unsigned long addr, unsigned long len, int prot,
145	int flags, int fd, off_t offset)
146	{
147	unsigned long result;
148
149	result = -EINVAL;
150	if (offset & ~PAGE_MASK)
151	goto out;
152
153	result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
154
155	out:
156	return result;
157	}
158
159	asmlinkage unsigned long
160	sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
161	unsigned long flags, unsigned long fd, unsigned long pgoff)
162	{
163	return do_mmap2(addr, len, prot, flags, fd, pgoff);
164	}
165
166	save_static_function(sys_fork);
167	__attribute_used__ noinline static int
168	_sys_fork(nabi_no_regargs struct pt_regs regs)
169	{
170	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
171	}
172
173	save_static_function(sys_clone);
174	__attribute_used__ noinline static int
175	_sys_clone(nabi_no_regargs struct pt_regs regs)
176	{
177	unsigned long clone_flags;
178	unsigned long newsp;
179	int parent_tidptr, child_tidptr;
180
181	clone_flags = regs.regs[4];
182	newsp = regs.regs[5];
183	if (!newsp)
184	newsp = regs.regs[29];
185	parent_tidptr = (int *) regs.regs[6];
186	child_tidptr = (int *) regs.regs[7];
187	return do_fork(clone_flags, newsp, &regs, 0,
188	parent_tidptr, child_tidptr);
189	}
190
191	/*
192	* sys_execve() executes a new program.
193	*/
194	asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
195	{
196	int error;
197	char * filename;
198
199	filename = getname((char *) (long)regs.regs[4]);
200	error = PTR_ERR(filename);
201	if (IS_ERR(filename))
202	goto out;
203	error = do_execve(filename, (char **) (long)regs.regs[5],
204	(char **) (long)regs.regs[6], &regs);
205	putname(filename);
206
207	out:
208	return error;
209	}
210
211	/*
212	* Compacrapability ...
213	*/
214	asmlinkage int sys_uname(struct old_utsname * name)
215	{
216	if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
217	return 0;
218	return -EFAULT;
219	}
220
221	/*
222	* Compacrapability ...
223	*/
224	asmlinkage int sys_olduname(struct oldold_utsname * name)
225	{
226	int error;
227
228	if (!name)
229	return -EFAULT;
230	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
231	return -EFAULT;
232
233	error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
234	error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
235	error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
236	error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
237	error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
238	error -= __put_user(0,name->release+__OLD_UTS_LEN);
239	error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
240	error -= __put_user(0,name->version+__OLD_UTS_LEN);
241	error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
242	error = __put_user(0,name->machine+__OLD_UTS_LEN);
243	error = error ? -EFAULT : 0;
244
245	return error;
246	}
247
248	asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3)
249	{
250	int tmp, len;
251	char *name;
252
253	switch(cmd) {
254	case SETNAME: {
255	char nodename[__NEW_UTS_LEN + 1];
256
257	if (!capable(CAP_SYS_ADMIN))
258	return -EPERM;
259
260	name = (char *) arg1;
261
262	len = strncpy_from_user(nodename, name, __NEW_UTS_LEN);
263	if (len < 0)
264	return -EFAULT;
265
266	down_write(&uts_sem);
267	strncpy(system_utsname.nodename, nodename, len);
268	nodename[__NEW_UTS_LEN] = '\0';
269	strlcpy(system_utsname.nodename, nodename,
270	sizeof(system_utsname.nodename));
271	up_write(&uts_sem);
272	return 0;
273	}
274
275	case MIPS_ATOMIC_SET:
276	printk(KERN_CRIT "How did I get here?\n");
277	return -EINVAL;
278
279	case MIPS_FIXADE:
280	tmp = current->thread.mflags & ~3;
281	current->thread.mflags = tmp \| (arg1 & 3);
282	return 0;
283
284	case FLUSH_CACHE:
285	__flush_cache_all();
286	return 0;
287
288	case MIPS_RDNVRAM:
289	return -EIO;
290	}
291
292	return -EINVAL;
293	}
294
295	/*
296	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
297	*
298	* This is really horribly ugly.
299	*/
300	asmlinkage int sys_ipc (uint call, int first, int second,
301	unsigned long third, void *ptr, long fifth)
302	{
303	int version, ret;
304
305	version = call >> 16; /* hack for backward compatibility */
306	call &= 0xffff;
307
308	switch (call) {
309	case SEMOP:
310	return sys_semtimedop (first, (struct sembuf *)ptr, second,
311	NULL);
312	case SEMTIMEDOP:
313	return sys_semtimedop (first, (struct sembuf *)ptr, second,
314	(const struct timespec __user *)fifth);
315	case SEMGET:
316	return sys_semget (first, second, third);
317	case SEMCTL: {
318	union semun fourth;
319	if (!ptr)
320	return -EINVAL;
321	if (get_user(fourth.__pad, (void **) ptr))
322	return -EFAULT;
323	return sys_semctl (first, second, third, fourth);
324	}
325
326	case MSGSND:
327	return sys_msgsnd (first, (struct msgbuf *) ptr,
328	second, third);
329	case MSGRCV:
330	switch (version) {
331	case 0: {
332	struct ipc_kludge tmp;
333	if (!ptr)
334	return -EINVAL;
335
336	if (copy_from_user(&tmp,
337	(struct ipc_kludge *) ptr,
338	sizeof (tmp)))
339	return -EFAULT;
340	return sys_msgrcv (first, tmp.msgp, second,
341	tmp.msgtyp, third);
342	}
343	default:
344	return sys_msgrcv (first,
345	(struct msgbuf *) ptr,
346	second, fifth, third);
347	}
348	case MSGGET:
349	return sys_msgget ((key_t) first, second);
350	case MSGCTL:
351	return sys_msgctl (first, second, (struct msqid_ds *) ptr);
352
353	case SHMAT:
354	switch (version) {
355	default: {
356	ulong raddr;
357	ret = do_shmat (first, (char *) ptr, second, &raddr);
358	if (ret)
359	return ret;
360	return put_user (raddr, (ulong *) third);
361	}
362	case 1: /* iBCS2 emulator entry point */
363	if (!segment_eq(get_fs(), get_ds()))
364	return -EINVAL;
365	return do_shmat (first, (char ) ptr, second, (ulong ) third);
366	}
367	case SHMDT:
368	return sys_shmdt ((char *)ptr);
369	case SHMGET:
370	return sys_shmget (first, second, third);
371	case SHMCTL:
372	return sys_shmctl (first, second,
373	(struct shmid_ds *) ptr);
374	default:
375	return -ENOSYS;
376	}
377	}
378
1da177e4 LT	379	/*
	380	* No implemented yet ...
	381	*/
	382	asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
	383	{
	384	return -ENOSYS;
	385	}
	386
	387	/*
	388	* If we ever come here the user sp is bad. Zap the process right away.
	389	* Due to the bad stack signaling wouldn't work.
	390	*/
	391	asmlinkage void bad_stack(void)
	392	{
	393	do_exit(SIGSEGV);
	394	}