[mirror_ubuntu-artful-kernel.git] / arch / s390 / kernel / sys_s390.c

/*
 *  arch/s390/kernel/sys_s390.c
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *               Thomas Spatzier (tspat@de.ibm.com)
 *
 *  Derived from "arch/i386/kernel/sys_i386.c"
 *
 *  This file contains various random system calls that
 *  have a non-standard calling sequence on the Linux/s390
 *  platform.
 */

#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/personality.h>
#include <linux/unistd.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 long sys_pipe(unsigned long __user *fildes)
{
	int fd[2];
	int error;

	error = do_pipe(fd);
	if (!error) {
		if (copy_to_user(fildes, fd, 2*sizeof(int)))
			error = -EFAULT;
	}
	return error;
}

/* common code for old and new mmaps */
static inline long do_mmap2(
	unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	unsigned long fd, unsigned long pgoff)
{
	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;
}

/*
 * Perform the select(nd, in, out, ex, tv) and mmap() system
 * calls. Linux for S/390 isn't able to handle more than 5
 * system call parameters, so these system calls used a memory
 * block for parameter passing..
 */

struct mmap_arg_struct {
	unsigned long addr;
	unsigned long len;
	unsigned long prot;
	unsigned long flags;
	unsigned long fd;
	unsigned long offset;
};

asmlinkage long sys_mmap2(struct mmap_arg_struct __user  *arg)
{
	struct mmap_arg_struct a;
	int error = -EFAULT;

	if (copy_from_user(&a, arg, sizeof(a)))
		goto out;
	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
out:
	return error;
}

asmlinkage long old_mmap(struct mmap_arg_struct __user *arg)
{
	struct mmap_arg_struct a;
	long error = -EFAULT;

	if (copy_from_user(&a, arg, sizeof(a)))
		goto out;

	error = -EINVAL;
	if (a.offset & ~PAGE_MASK)
		goto out;

	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
	return error;
}

#ifndef CONFIG_64BIT
struct sel_arg_struct {
	unsigned long n;
	fd_set __user *inp, *outp, *exp;
	struct timeval __user *tvp;
};

asmlinkage long old_select(struct sel_arg_struct __user *arg)
{
	struct sel_arg_struct a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	/* sys_select() does the appropriate kernel locking */
	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);

}
#endif /* CONFIG_64BIT */

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

        switch (call) {
        case SEMOP:
		return sys_semtimedop(first, (struct sembuf __user *)ptr,
				       (unsigned)second, NULL);
	case SEMTIMEDOP:
		return sys_semtimedop(first, (struct sembuf __user *)ptr,
				       (unsigned)second,
				       (const struct timespec __user *) third);
        case SEMGET:
                return sys_semget(first, (int)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, (int)second, third, fourth);
        }
        case MSGSND:
		return sys_msgsnd (first, (struct msgbuf __user *) ptr,
                                   (size_t)second, third);
		break;
        case MSGRCV:
                if (!ptr)
                        return -EINVAL;
                if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
                                    sizeof (struct ipc_kludge)))
                        return -EFAULT;
                return sys_msgrcv (first, tmp.msgp,
                                   (size_t)second, tmp.msgtyp, third);
        case MSGGET:
                return sys_msgget((key_t)first, (int)second);
        case MSGCTL:
                return sys_msgctl(first, (int)second,
				   (struct msqid_ds __user *)ptr);

	case SHMAT: {
		ulong raddr;
		ret = do_shmat(first, (char __user *)ptr,
				(int)second, &raddr);
		if (ret)
			return ret;
		return put_user (raddr, (ulong __user *) third);
		break;
        }
	case SHMDT:
		return sys_shmdt ((char __user *)ptr);
	case SHMGET:
		return sys_shmget(first, (size_t)second, third);
	case SHMCTL:
		return sys_shmctl(first, (int)second,
                                   (struct shmid_ds __user *) ptr);
	default:
		return -ENOSYS;

	}

	return -EINVAL;
}

#ifdef CONFIG_64BIT
asmlinkage long s390x_newuname(struct new_utsname __user *name)
{
	int ret = sys_newuname(name);

	if (current->personality == PER_LINUX32 && !ret) {
		ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
		if (ret) ret = -EFAULT;
	}
	return ret;
}

asmlinkage long s390x_personality(unsigned long personality)
{
	int ret;

	if (current->personality == PER_LINUX32 && personality == PER_LINUX)
		personality = PER_LINUX32;
	ret = sys_personality(personality);
	if (ret == PER_LINUX32)
		ret = PER_LINUX;

	return ret;
}
#endif /* CONFIG_64BIT */

/*
 * Wrapper function for sys_fadvise64/fadvise64_64
 */
#ifndef CONFIG_64BIT

asmlinkage long
s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
{
	return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
			len, advice);
}

#endif

struct fadvise64_64_args {
	int fd;
	long long offset;
	long long len;
	int advice;
};

asmlinkage long
s390_fadvise64_64(struct fadvise64_64_args __user *args)
{
	struct fadvise64_64_args a;

	if ( copy_from_user(&a, args, sizeof(a)) )
		return -EFAULT;
	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}

#ifndef CONFIG_64BIT
/*
 * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
 * 64 bit argument "len" is split into the upper and lower 32 bits. The
 * system call wrapper in the user space loads the value to %r6/%r7.
 * The code in entry.S keeps the values in %r2 - %r6 where they are and
 * stores %r7 to 96(%r15). But the standard C linkage requires that
 * the whole 64 bit value for len is stored on the stack and doesn't
 * use %r6 at all. So s390_fallocate has to convert the arguments from
 *   %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
 * to
 *   %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
 */
asmlinkage long s390_fallocate(int fd, int mode, loff_t offset,
			       u32 len_high, u32 len_low)
{
	return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/s390/kernel/sys_s390.c
	3	*
	4	* S390 version
	5	* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
	7	* Thomas Spatzier (tspat@de.ibm.com)
	8	*
	9	* Derived from "arch/i386/kernel/sys_i386.c"
	10	*
	11	* This file contains various random system calls that
	12	* have a non-standard calling sequence on the Linux/s390
	13	* platform.
	14	*/
	15
	16	#include <linux/errno.h>
	17	#include <linux/sched.h>
	18	#include <linux/mm.h>
	19	#include <linux/smp.h>
1da177e4 LT	20	#include <linux/sem.h>
	21	#include <linux/msg.h>
	22	#include <linux/shm.h>
	23	#include <linux/stat.h>
	24	#include <linux/syscalls.h>
	25	#include <linux/mman.h>
	26	#include <linux/file.h>
	27	#include <linux/utsname.h>
1da177e4	28	#include <linux/personality.h>
fe74290d	29	#include <linux/unistd.h>
1da177e4 LT	30
	31	#include <asm/uaccess.h>
	32	#include <asm/ipc.h>
	33
	34	/*
	35	* sys_pipe() is the normal C calling standard for creating
	36	* a pipe. It's not the way Unix traditionally does this, though.
	37	*/
	38	asmlinkage long sys_pipe(unsigned long __user *fildes)
	39	{
	40	int fd[2];
	41	int error;
	42
	43	error = do_pipe(fd);
	44	if (!error) {
	45	if (copy_to_user(fildes, fd, 2*sizeof(int)))
	46	error = -EFAULT;
	47	}
	48	return error;
	49	}
	50
	51	/* common code for old and new mmaps */
	52	static inline long do_mmap2(
	53	unsigned long addr, unsigned long len,
	54	unsigned long prot, unsigned long flags,
	55	unsigned long fd, unsigned long pgoff)
	56	{
	57	long error = -EBADF;
	58	struct file * file = NULL;
	59
	60	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	61	if (!(flags & MAP_ANONYMOUS)) {
	62	file = fget(fd);
	63	if (!file)
	64	goto out;
	65	}
	66
	67	down_write(&current->mm->mmap_sem);
	68	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	69	up_write(&current->mm->mmap_sem);
	70
	71	if (file)
	72	fput(file);
	73	out:
	74	return error;
	75	}
	76
	77	/*
	78	* Perform the select(nd, in, out, ex, tv) and mmap() system
	79	* calls. Linux for S/390 isn't able to handle more than 5
	80	* system call parameters, so these system calls used a memory
	81	* block for parameter passing..
	82	*/
	83
	84	struct mmap_arg_struct {
	85	unsigned long addr;
	86	unsigned long len;
	87	unsigned long prot;
	88	unsigned long flags;
	89	unsigned long fd;
	90	unsigned long offset;
	91	};
	92
	93	asmlinkage long sys_mmap2(struct mmap_arg_struct __user *arg)
94	{
95	struct mmap_arg_struct a;
96	int error = -EFAULT;
97
98	if (copy_from_user(&a, arg, sizeof(a)))
99	goto out;
100	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
101	out:
102	return error;
103	}
104
105	asmlinkage long old_mmap(struct mmap_arg_struct __user *arg)
106	{
107	struct mmap_arg_struct a;
108	long error = -EFAULT;
109
110	if (copy_from_user(&a, arg, sizeof(a)))
111	goto out;
112
113	error = -EINVAL;
114	if (a.offset & ~PAGE_MASK)
115	goto out;
116
117	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
118	out:
119	return error;
120	}
121
347a8dc3	122	#ifndef CONFIG_64BIT
1da177e4 LT	123	struct sel_arg_struct {
1da177e4 LT	124	unsigned long n;
793af244 AV	125	fd_set __user inp, outp, *exp;
793af244 AV	126	struct timeval __user *tvp;
1da177e4 LT	127	};
	128
	129	asmlinkage long old_select(struct sel_arg_struct __user *arg)
	130	{
	131	struct sel_arg_struct a;
	132
	133	if (copy_from_user(&a, arg, sizeof(a)))
	134	return -EFAULT;
	135	/* sys_select() does the appropriate kernel locking */
	136	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
	137
	138	}
347a8dc3	139	#endif /* CONFIG_64BIT */
1da177e4 LT	140
	141	/*
	142	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	143	*
	144	* This is really horribly ugly.
	145	*/
	146	asmlinkage long sys_ipc(uint call, int first, unsigned long second,
	147	unsigned long third, void __user *ptr)
	148	{
	149	struct ipc_kludge tmp;
	150	int ret;
	151
	152	switch (call) {
	153	case SEMOP:
	154	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	155	(unsigned)second, NULL);
	156	case SEMTIMEDOP:
	157	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	158	(unsigned)second,
	159	(const struct timespec __user *) third);
	160	case SEMGET:
	161	return sys_semget(first, (int)second, third);
	162	case SEMCTL: {
	163	union semun fourth;
	164	if (!ptr)
	165	return -EINVAL;
	166	if (get_user(fourth.__pad, (void __user * __user *) ptr))
	167	return -EFAULT;
	168	return sys_semctl(first, (int)second, third, fourth);
	169	}
	170	case MSGSND:
	171	return sys_msgsnd (first, (struct msgbuf __user *) ptr,
	172	(size_t)second, third);
	173	break;
	174	case MSGRCV:
	175	if (!ptr)
	176	return -EINVAL;
	177	if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
	178	sizeof (struct ipc_kludge)))
	179	return -EFAULT;
	180	return sys_msgrcv (first, tmp.msgp,
	181	(size_t)second, tmp.msgtyp, third);
	182	case MSGGET:
	183	return sys_msgget((key_t)first, (int)second);
	184	case MSGCTL:
	185	return sys_msgctl(first, (int)second,
	186	(struct msqid_ds __user *)ptr);
	187
	188	case SHMAT: {
	189	ulong raddr;
	190	ret = do_shmat(first, (char __user *)ptr,
	191	(int)second, &raddr);
	192	if (ret)
	193	return ret;
	194	return put_user (raddr, (ulong __user *) third);
	195	break;
	196	}
	197	case SHMDT:
	198	return sys_shmdt ((char __user *)ptr);
	199	case SHMGET:
	200	return sys_shmget(first, (size_t)second, third);
	201	case SHMCTL:
	202	return sys_shmctl(first, (int)second,
	203	(struct shmid_ds __user *) ptr);
204	default:
205	return -ENOSYS;
206
207	}
208
209	return -EINVAL;
210	}
211
347a8dc3	212	#ifdef CONFIG_64BIT
1da177e4 LT	213	asmlinkage long s390x_newuname(struct new_utsname __user *name)
	214	{
	215	int ret = sys_newuname(name);
	216
	217	if (current->personality == PER_LINUX32 && !ret) {
	218	ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
	219	if (ret) ret = -EFAULT;
	220	}
	221	return ret;
	222	}
	223
	224	asmlinkage long s390x_personality(unsigned long personality)
	225	{
	226	int ret;
	227
	228	if (current->personality == PER_LINUX32 && personality == PER_LINUX)
	229	personality = PER_LINUX32;
	230	ret = sys_personality(personality);
	231	if (ret == PER_LINUX32)
	232	ret = PER_LINUX;
	233
	234	return ret;
	235	}
347a8dc3	236	#endif /* CONFIG_64BIT */
1da177e4 LT	237
	238	/*
	239	* Wrapper function for sys_fadvise64/fadvise64_64
	240	*/
347a8dc3	241	#ifndef CONFIG_64BIT
1da177e4 LT	242
	243	asmlinkage long
	244	s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice)
	245	{
	246	return sys_fadvise64(fd, (u64) offset_high << 32 \| offset_low,
	247	len, advice);
	248	}
	249
	250	#endif
	251
	252	struct fadvise64_64_args {
	253	int fd;
	254	long long offset;
	255	long long len;
	256	int advice;
	257	};
	258
	259	asmlinkage long
	260	s390_fadvise64_64(struct fadvise64_64_args __user *args)
	261	{
	262	struct fadvise64_64_args a;
	263
	264	if ( copy_from_user(&a, args, sizeof(a)) )
	265	return -EFAULT;
	266	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	267	}
7a8e0c8d MS	268
	269	#ifndef CONFIG_64BIT
	270	/*
	271	* This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
	272	* 64 bit argument "len" is split into the upper and lower 32 bits. The
	273	* system call wrapper in the user space loads the value to %r6/%r7.
	274	* The code in entry.S keeps the values in %r2 - %r6 where they are and
	275	* stores %r7 to 96(%r15). But the standard C linkage requires that
	276	* the whole 64 bit value for len is stored on the stack and doesn't
	277	* use %r6 at all. So s390_fallocate has to convert the arguments from
	278	* %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
	279	* to
	280	* %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
	281	*/
	282	asmlinkage long s390_fallocate(int fd, int mode, loff_t offset,
	283	u32 len_high, u32 len_low)
	284	{
	285	return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) \| len_low);
	286	}
	287	#endif