[GitHub/mt8127/android_kernel_alcatel_ttab.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/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 <linux/fs.h>
#include <linux/ipc.h>
#include <asm/syscalls.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>

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;

	trace_mark(kernel_arch_ipc_call, "call %u first %d", call, first);

	if (call <= SEMTIMEDOP)
		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 * __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 __user *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;
}
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	*/
1da177e4 LT	10	#include <linux/errno.h>
	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/smp.h>
1da177e4 LT	14	#include <linux/sem.h>
	15	#include <linux/msg.h>
	16	#include <linux/shm.h>
	17	#include <linux/stat.h>
	18	#include <linux/syscalls.h>
	19	#include <linux/mman.h>
	20	#include <linux/file.h>
	21	#include <linux/utsname.h>
f3c25758	22	#include <linux/module.h>
e06c4e57	23	#include <linux/fs.h>
cba4fbbf	24	#include <linux/ipc.h>
fa43972f	25	#include <asm/syscalls.h>
1da177e4	26	#include <asm/uaccess.h>
fe74290d	27	#include <asm/unistd.h>
1da177e4	28
1da177e4	29	static inline long
bcb28e42	30	do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
1da177e4 LT	31	unsigned long flags, int fd, unsigned long pgoff)
	32	{
	33	int error = -EBADF;
	34	struct file *file = NULL;
	35
	36	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	37	if (!(flags & MAP_ANONYMOUS)) {
	38	file = fget(fd);
	39	if (!file)
	40	goto out;
	41	}
	42
	43	down_write(&current->mm->mmap_sem);
	44	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	45	up_write(&current->mm->mmap_sem);
	46
	47	if (file)
	48	fput(file);
	49	out:
	50	return error;
	51	}
	52
	53	asmlinkage int old_mmap(unsigned long addr, unsigned long len,
	54	unsigned long prot, unsigned long flags,
	55	int fd, unsigned long off)
	56	{
	57	if (off & ~PAGE_MASK)
	58	return -EINVAL;
	59	return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
	60	}
	61
	62	asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
	63	unsigned long prot, unsigned long flags,
	64	unsigned long fd, unsigned long pgoff)
	65	{
	66	return do_mmap2(addr, len, prot, flags, fd, pgoff);
	67	}
	68
	69	/*
	70	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	71	*
	72	* This is really horribly ugly.
	73	*/
	74	asmlinkage int sys_ipc(uint call, int first, int second,
	75	int third, void __user *ptr, long fifth)
	76	{
	77	int version, ret;
	78
	79	version = call >> 16; /* hack for backward compatibility */
	80	call &= 0xffff;
	81
3d58695e PM	82	trace_mark(kernel_arch_ipc_call, "call %u first %d", call, first);
3d58695e PM	83
3c31bf73	84	if (call <= SEMTIMEDOP)
1da177e4 LT	85	switch (call) {
1da177e4 LT	86	case SEMOP:
bcb28e42 PM	87	return sys_semtimedop(first,
bcb28e42 PM	88	(struct sembuf __user *)ptr,
1da177e4 LT	89	second, NULL);
1da177e4 LT	90	case SEMTIMEDOP:
bcb28e42 PM	91	return sys_semtimedop(first,
	92	(struct sembuf __user *)ptr, second,
	93	(const struct timespec __user *)fifth);
1da177e4 LT	94	case SEMGET:
	95	return sys_semget (first, second, third);
	96	case SEMCTL: {
	97	union semun fourth;
	98	if (!ptr)
	99	return -EINVAL;
fa43972f	100	if (get_user(fourth.__pad, (void __user * __user *) ptr))
1da177e4 LT	101	return -EFAULT;
	102	return sys_semctl (first, second, third, fourth);
	103	}
	104	default:
	105	return -EINVAL;
	106	}
	107
bcb28e42	108	if (call <= MSGCTL)
1da177e4 LT	109	switch (call) {
1da177e4 LT	110	case MSGSND:
bcb28e42	111	return sys_msgsnd (first, (struct msgbuf __user *) ptr,
1da177e4 LT	112	second, third);
	113	case MSGRCV:
	114	switch (version) {
bcb28e42 PM	115	case 0:
bcb28e42 PM	116	{
1da177e4	117	struct ipc_kludge tmp;
bcb28e42	118
1da177e4 LT	119	if (!ptr)
1da177e4 LT	120	return -EINVAL;
bcb28e42	121
1da177e4	122	if (copy_from_user(&tmp,
bcb28e42	123	(struct ipc_kludge __user *) ptr,
1da177e4 LT	124	sizeof (tmp)))
1da177e4 LT	125	return -EFAULT;
bcb28e42	126
1da177e4 LT	127	return sys_msgrcv (first, tmp.msgp, second,
1da177e4 LT	128	tmp.msgtyp, third);
bcb28e42	129	}
1da177e4 LT	130	default:
	131	return sys_msgrcv (first,
	132	(struct msgbuf __user *) ptr,
	133	second, fifth, third);
	134	}
	135	case MSGGET:
	136	return sys_msgget ((key_t) first, second);
	137	case MSGCTL:
	138	return sys_msgctl (first, second,
	139	(struct msqid_ds __user *) ptr);
	140	default:
	141	return -EINVAL;
	142	}
bcb28e42	143	if (call <= SHMCTL)
1da177e4 LT	144	switch (call) {
	145	case SHMAT:
	146	switch (version) {
	147	default: {
	148	ulong raddr;
	149	ret = do_shmat (first, (char __user *) ptr,
	150	second, &raddr);
	151	if (ret)
	152	return ret;
	153	return put_user (raddr, (ulong __user *) third);
	154	}
	155	case 1: /* iBCS2 emulator entry point */
	156	if (!segment_eq(get_fs(), get_ds()))
	157	return -EINVAL;
	158	return do_shmat (first, (char __user *) ptr,
	159	second, (ulong *) third);
	160	}
bcb28e42	161	case SHMDT:
1da177e4 LT	162	return sys_shmdt ((char __user *)ptr);
	163	case SHMGET:
	164	return sys_shmget (first, second, third);
	165	case SHMCTL:
	166	return sys_shmctl (first, second,
	167	(struct shmid_ds __user *) ptr);
	168	default:
	169	return -EINVAL;
	170	}
bcb28e42	171
1da177e4 LT	172	return -EINVAL;
	173	}
	174
fa43972f	175	asmlinkage int sys_uname(struct old_utsname __user *name)
1da177e4 LT	176	{
	177	int err;
	178	if (!name)
	179	return -EFAULT;
	180	down_read(&uts_sem);
fa43972f	181	err = copy_to_user(name, utsname(), sizeof(*name));
1da177e4 LT	182	up_read(&uts_sem);
	183	return err?-EFAULT:0;
	184	}