[linux-block.git] / arch / sh / kernel / sys_sh.c

/*
 * linux/arch/sh/kernel/sys_sh.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/SuperH
 * platform.
 *
 * Taken from i386 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/file.h>
#include <linux/utsname.h>
#include <linux/module.h>
#include <asm/cacheflush.h>
#include <asm/uaccess.h>
#include <asm/ipc.h>

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way Unix traditionally does this, though.
 */
asmlinkage int sys_pipe(unsigned long r4, unsigned long r5,
	unsigned long r6, unsigned long r7,
	struct pt_regs regs)
{
	int fd[2];
	int error;

	error = do_pipe(fd);
	if (!error) {
		regs.regs[1] = fd[1];
		return fd[0];
	}
	return error;
}

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

EXPORT_SYMBOL(shm_align_mask);

/*
 * To avoid cache aliases, we map the shared page with same color.
 */
#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 mm_struct *mm = current->mm;
	struct vm_area_struct *vma;
	unsigned long start_addr;
	int do_colour_align;

	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 (unlikely(len > TASK_SIZE))
		return -ENOMEM;

	do_colour_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_colour_align = 1;

	if (addr) {
		if (do_colour_align)
			addr = COLOUR_ALIGN(addr, pgoff);
		else
			addr = PAGE_ALIGN(addr);

		vma = find_vma(mm, addr);
		if (TASK_SIZE - len >= addr &&
		    (!vma || addr + len <= vma->vm_start))
			return addr;
	}

	if (len > mm->cached_hole_size) {
		start_addr = addr = mm->free_area_cache;
	} else {
	        mm->cached_hole_size = 0;
		start_addr = addr = TASK_UNMAPPED_BASE;
	}

full_search:
	if (do_colour_align)
		addr = COLOUR_ALIGN(addr, pgoff);
	else
		addr = PAGE_ALIGN(mm->free_area_cache);

	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
		/* At this point:  (!vma || addr < vma->vm_end). */
		if (unlikely(TASK_SIZE - len < addr)) {
			/*
			 * Start a new search - just in case we missed
			 * some holes.
			 */
			if (start_addr != TASK_UNMAPPED_BASE) {
				start_addr = addr = TASK_UNMAPPED_BASE;
				mm->cached_hole_size = 0;
				goto full_search;
			}
			return -ENOMEM;
		}
		if (likely(!vma || addr + len <= vma->vm_start)) {
			/*
			 * Remember the place where we stopped the search:
			 */
			mm->free_area_cache = addr + len;
			return addr;
		}
		if (addr + mm->cached_hole_size < vma->vm_start)
		        mm->cached_hole_size = vma->vm_start - addr;

		addr = vma->vm_end;
		if (do_colour_align)
			addr = COLOUR_ALIGN(addr, pgoff);
	}
}

static inline long
do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 
	 unsigned long flags, int fd, unsigned long pgoff)
{
	int 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 int old_mmap(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	int fd, unsigned long off)
{
	if (off & ~PAGE_MASK)
		return -EINVAL;
	return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
}

asmlinkage 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);
}

/*
 * 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,
		       int third, void __user *ptr, long fifth)
{
	int version, ret;

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

	if (call <= SEMCTL)
		switch (call) {
		case SEMOP:
			return sys_semtimedop(first, (struct sembuf __user *)ptr,
					      second, NULL);
		case SEMTIMEDOP:
			return sys_semtimedop(first, (struct sembuf __user *)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 * __user *) ptr))
				return -EFAULT;
			return sys_semctl (first, second, third, fourth);
			}
		default:
			return -EINVAL;
		}

	if (call <= MSGCTL) 
		switch (call) {
		case MSGSND:
			return sys_msgsnd (first, (struct msgbuf __user *) 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 __user *) ptr, 
						   sizeof (tmp)))
					return -EFAULT;
				return sys_msgrcv (first, tmp.msgp, second,
						   tmp.msgtyp, third);
				}
			default:
				return sys_msgrcv (first,
						   (struct msgbuf __user *) ptr,
						   second, fifth, third);
			}
		case MSGGET:
			return sys_msgget ((key_t) first, second);
		case MSGCTL:
			return sys_msgctl (first, second,
					   (struct msqid_ds __user *) ptr);
		default:
			return -EINVAL;
		}
	if (call <= SHMCTL) 
		switch (call) {
		case SHMAT:
			switch (version) {
			default: {
				ulong raddr;
				ret = do_shmat (first, (char __user *) ptr,
						 second, &raddr);
				if (ret)
					return ret;
				return put_user (raddr, (ulong __user *) third);
			}
			case 1:	/* iBCS2 emulator entry point */
				if (!segment_eq(get_fs(), get_ds()))
					return -EINVAL;
				return do_shmat (first, (char __user *) ptr,
						  second, (ulong *) third);
			}
		case SHMDT: 
			return sys_shmdt ((char __user *)ptr);
		case SHMGET:
			return sys_shmget (first, second, third);
		case SHMCTL:
			return sys_shmctl (first, second,
					   (struct shmid_ds __user *) ptr);
		default:
			return -EINVAL;
		}
	
	return -EINVAL;
}

asmlinkage int sys_uname(struct old_utsname * name)
{
	int err;
	if (!name)
		return -EFAULT;
	down_read(&uts_sem);
	err = copy_to_user(name, utsname(), sizeof (*name));
	up_read(&uts_sem);
	return err?-EFAULT:0;
}

asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
			     size_t count, long dummy, loff_t pos)
{
	return sys_pread64(fd, buf, count, pos);
}

asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
			      size_t count, long dummy, loff_t pos)
{
	return sys_pwrite64(fd, buf, count, pos);
}

asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
				u32 len0, u32 len1, int advice)
{
#ifdef  __LITTLE_ENDIAN__
	return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
				(u64)len1 << 32 | len0,	advice);
#else
	return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
				(u64)len0 << 32 | len1,	advice);
#endif
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/sh/kernel/sys_sh.c
	3	*
	4	* This file contains various random system calls that
	5	* have a non-standard calling sequence on the Linux/SuperH
	6	* platform.
	7	*
	8	* Taken from i386 version.
	9	*/
	10
	11	#include <linux/errno.h>
	12	#include <linux/sched.h>
	13	#include <linux/mm.h>
	14	#include <linux/smp.h>
	15	#include <linux/smp_lock.h>
	16	#include <linux/sem.h>
	17	#include <linux/msg.h>
	18	#include <linux/shm.h>
	19	#include <linux/stat.h>
	20	#include <linux/syscalls.h>
	21	#include <linux/mman.h>
	22	#include <linux/file.h>
	23	#include <linux/utsname.h>
f3c25758	24	#include <linux/module.h>
26ff6c11	25	#include <asm/cacheflush.h>
1da177e4 LT	26	#include <asm/uaccess.h>
	27	#include <asm/ipc.h>
	28
	29	/*
	30	* sys_pipe() is the normal C calling standard for creating
	31	* a pipe. It's not the way Unix traditionally does this, though.
	32	*/
	33	asmlinkage int sys_pipe(unsigned long r4, unsigned long r5,
	34	unsigned long r6, unsigned long r7,
	35	struct pt_regs regs)
	36	{
	37	int fd[2];
	38	int error;
	39
	40	error = do_pipe(fd);
	41	if (!error) {
	42	regs.regs[1] = fd[1];
	43	return fd[0];
	44	}
	45	return error;
	46	}
	47
f3c25758 PM	48	unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
	49
	50	EXPORT_SYMBOL(shm_align_mask);
	51
1da177e4	52	/*
f3c25758	53	* To avoid cache aliases, we map the shared page with same color.
1da177e4	54	*/
f3c25758 PM	55	#define COLOUR_ALIGN(addr, pgoff) \
	56	((((addr) + shm_align_mask) & ~shm_align_mask) + \
	57	(((pgoff) << PAGE_SHIFT) & shm_align_mask))
1da177e4 LT	58
	59	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	60	unsigned long len, unsigned long pgoff, unsigned long flags)
	61	{
	62	struct mm_struct *mm = current->mm;
	63	struct vm_area_struct *vma;
	64	unsigned long start_addr;
f3c25758	65	int do_colour_align;
1da177e4 LT	66
	67	if (flags & MAP_FIXED) {
	68	/* We do not accept a shared mapping if it would violate
	69	* cache aliasing constraints.
	70	*/
f3c25758	71	if ((flags & MAP_SHARED) && (addr & shm_align_mask))
1da177e4 LT	72	return -EINVAL;
	73	return addr;
	74	}
	75
f3c25758	76	if (unlikely(len > TASK_SIZE))
1da177e4 LT	77	return -ENOMEM;
1da177e4 LT	78
f3c25758 PM	79	do_colour_align = 0;
	80	if (filp \|\| (flags & MAP_SHARED))
	81	do_colour_align = 1;
	82
1da177e4	83	if (addr) {
f3c25758 PM	84	if (do_colour_align)
f3c25758 PM	85	addr = COLOUR_ALIGN(addr, pgoff);
1da177e4	86	else
f3c25758 PM	87	addr = PAGE_ALIGN(addr);
f3c25758 PM	88
1da177e4 LT	89	vma = find_vma(mm, addr);
	90	if (TASK_SIZE - len >= addr &&
	91	(!vma \|\| addr + len <= vma->vm_start))
	92	return addr;
	93	}
f3c25758 PM	94
	95	if (len > mm->cached_hole_size) {
	96	start_addr = addr = mm->free_area_cache;
	97	} else {
1363c3cd	98	mm->cached_hole_size = 0;
f3c25758	99	start_addr = addr = TASK_UNMAPPED_BASE;
1363c3cd	100	}
1da177e4 LT	101
1da177e4 LT	102	full_search:
f3c25758 PM	103	if (do_colour_align)
	104	addr = COLOUR_ALIGN(addr, pgoff);
	105	else
	106	addr = PAGE_ALIGN(mm->free_area_cache);
	107
1da177e4 LT	108	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
1da177e4 LT	109	/* At this point: (!vma \|\| addr < vma->vm_end). */
f3c25758	110	if (unlikely(TASK_SIZE - len < addr)) {
1da177e4 LT	111	/*
	112	* Start a new search - just in case we missed
	113	* some holes.
	114	*/
	115	if (start_addr != TASK_UNMAPPED_BASE) {
	116	start_addr = addr = TASK_UNMAPPED_BASE;
1363c3cd	117	mm->cached_hole_size = 0;
1da177e4 LT	118	goto full_search;
	119	}
	120	return -ENOMEM;
	121	}
f3c25758	122	if (likely(!vma \|\| addr + len <= vma->vm_start)) {
1da177e4 LT	123	/*
	124	* Remember the place where we stopped the search:
	125	*/
	126	mm->free_area_cache = addr + len;
	127	return addr;
	128	}
1363c3cd WW	129	if (addr + mm->cached_hole_size < vma->vm_start)
	130	mm->cached_hole_size = vma->vm_start - addr;
	131
1da177e4	132	addr = vma->vm_end;
f3c25758 PM	133	if (do_colour_align)
f3c25758 PM	134	addr = COLOUR_ALIGN(addr, pgoff);
1da177e4 LT	135	}
1da177e4 LT	136	}
1da177e4 LT	137
	138	static inline long
	139	do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
	140	unsigned long flags, int fd, unsigned long pgoff)
	141	{
	142	int error = -EBADF;
	143	struct file *file = NULL;
	144
	145	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	146	if (!(flags & MAP_ANONYMOUS)) {
	147	file = fget(fd);
	148	if (!file)
	149	goto out;
	150	}
	151
	152	down_write(&current->mm->mmap_sem);
	153	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	154	up_write(&current->mm->mmap_sem);
	155
	156	if (file)
	157	fput(file);
	158	out:
	159	return error;
	160	}
	161
	162	asmlinkage int old_mmap(unsigned long addr, unsigned long len,
	163	unsigned long prot, unsigned long flags,
	164	int fd, unsigned long off)
	165	{
	166	if (off & ~PAGE_MASK)
	167	return -EINVAL;
	168	return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
	169	}
	170
	171	asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
	172	unsigned long prot, unsigned long flags,
	173	unsigned long fd, unsigned long pgoff)
	174	{
	175	return do_mmap2(addr, len, prot, flags, fd, pgoff);
	176	}
	177
	178	/*
	179	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	180	*
	181	* This is really horribly ugly.
	182	*/
	183	asmlinkage int sys_ipc(uint call, int first, int second,
	184	int third, void __user *ptr, long fifth)
	185	{
	186	int version, ret;
	187
	188	version = call >> 16; /* hack for backward compatibility */
	189	call &= 0xffff;
	190
	191	if (call <= SEMCTL)
	192	switch (call) {
	193	case SEMOP:
	194	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	195	second, NULL);
	196	case SEMTIMEDOP:
	197	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	198	second,
	199	(const struct timespec __user *)fifth);
	200	case SEMGET:
201	return sys_semget (first, second, third);
202	case SEMCTL: {
203	union semun fourth;
204	if (!ptr)
205	return -EINVAL;
206	if (get_user(fourth.__pad, (void * __user *) ptr))
207	return -EFAULT;
208	return sys_semctl (first, second, third, fourth);
209	}
210	default:
211	return -EINVAL;
212	}
213
214	if (call <= MSGCTL)
215	switch (call) {
216	case MSGSND:
217	return sys_msgsnd (first, (struct msgbuf __user *) ptr,
218	second, third);
219	case MSGRCV:
220	switch (version) {
221	case 0: {
222	struct ipc_kludge tmp;
223	if (!ptr)
224	return -EINVAL;
225
226	if (copy_from_user(&tmp,
227	(struct ipc_kludge __user *) ptr,
228	sizeof (tmp)))
229	return -EFAULT;
230	return sys_msgrcv (first, tmp.msgp, second,
231	tmp.msgtyp, third);
232	}
233	default:
234	return sys_msgrcv (first,
235	(struct msgbuf __user *) ptr,
236	second, fifth, third);
237	}
238	case MSGGET:
239	return sys_msgget ((key_t) first, second);
240	case MSGCTL:
241	return sys_msgctl (first, second,
242	(struct msqid_ds __user *) ptr);
243	default:
244	return -EINVAL;
245	}
246	if (call <= SHMCTL)
247	switch (call) {
248	case SHMAT:
249	switch (version) {
250	default: {
251	ulong raddr;
252	ret = do_shmat (first, (char __user *) ptr,
253	second, &raddr);
254	if (ret)
255	return ret;
256	return put_user (raddr, (ulong __user *) third);
257	}
258	case 1: /* iBCS2 emulator entry point */
259	if (!segment_eq(get_fs(), get_ds()))
260	return -EINVAL;
261	return do_shmat (first, (char __user *) ptr,
262	second, (ulong *) third);
263	}
264	case SHMDT:
265	return sys_shmdt ((char __user *)ptr);
266	case SHMGET:
267	return sys_shmget (first, second, third);
268	case SHMCTL:
269	return sys_shmctl (first, second,
270	(struct shmid_ds __user *) ptr);
271	default:
272	return -EINVAL;
273	}
274
275	return -EINVAL;
276	}
277
278	asmlinkage int sys_uname(struct old_utsname * name)
279	{
280	int err;
281	if (!name)
282	return -EFAULT;
283	down_read(&uts_sem);
e9ff3990	284	err = copy_to_user(name, utsname(), sizeof (*name));
1da177e4 LT	285	up_read(&uts_sem);
	286	return err?-EFAULT:0;
	287	}
	288
	289	asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
	290	size_t count, long dummy, loff_t pos)
	291	{
	292	return sys_pread64(fd, buf, count, pos);
	293	}
	294
	295	asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
	296	size_t count, long dummy, loff_t pos)
	297	{
	298	return sys_pwrite64(fd, buf, count, pos);
	299	}
	300
	301	asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
	302	u32 len0, u32 len1, int advice)
	303	{
	304	#ifdef __LITTLE_ENDIAN__
	305	return sys_fadvise64_64(fd, (u64)offset1 << 32 \| offset0,
	306	(u64)len1 << 32 \| len0, advice);
	307	#else
	308	return sys_fadvise64_64(fd, (u64)offset0 << 32 \| offset1,
	309	(u64)len0 << 32 \| len1, advice);
	310	#endif
	311	}