[mirror_ubuntu-zesty-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/fs.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 <linux/ipc.h>
#include <asm/uaccess.h>
#include "entry.h"

/*
 * 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;
};

SYSCALL_DEFINE1(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 = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
out:
	return error;
}

SYSCALL_DEFINE1(s390_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 = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
	return error;
}

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */
SYSCALL_DEFINE5(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
SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name)
{
	int ret = sys_newuname(name);

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

SYSCALL_DEFINE1(s390_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

SYSCALL_DEFINE5(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);
}

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

SYSCALL_DEFINE1(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);
}

/*
 * 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
 */
SYSCALL_DEFINE(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);
}
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
				   long len_high, long len_low)
{
	return SYSC_s390_fallocate((int) fd, (int) mode, offset,
				   (u32) len_high, (u32) len_low);
}
SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
#endif

#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>
4e950f6f	19	#include <linux/fs.h>
1da177e4	20	#include <linux/smp.h>
1da177e4 LT	21	#include <linux/sem.h>
	22	#include <linux/msg.h>
	23	#include <linux/shm.h>
	24	#include <linux/stat.h>
	25	#include <linux/syscalls.h>
	26	#include <linux/mman.h>
	27	#include <linux/file.h>
	28	#include <linux/utsname.h>
1da177e4	29	#include <linux/personality.h>
fe74290d	30	#include <linux/unistd.h>
cba4fbbf	31	#include <linux/ipc.h>
1da177e4	32	#include <asm/uaccess.h>
a806170e	33	#include "entry.h"
1da177e4	34
1da177e4 LT	35	/*
	36	* Perform the select(nd, in, out, ex, tv) and mmap() system
	37	* calls. Linux for S/390 isn't able to handle more than 5
	38	* system call parameters, so these system calls used a memory
	39	* block for parameter passing..
	40	*/
	41
	42	struct mmap_arg_struct {
	43	unsigned long addr;
	44	unsigned long len;
	45	unsigned long prot;
	46	unsigned long flags;
	47	unsigned long fd;
	48	unsigned long offset;
	49	};
	50
26689452	51	SYSCALL_DEFINE1(mmap2, struct mmap_arg_struct __user *, arg)
1da177e4 LT	52	{
	53	struct mmap_arg_struct a;
	54	int error = -EFAULT;
	55
	56	if (copy_from_user(&a, arg, sizeof(a)))
	57	goto out;
f8b72560	58	error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
1da177e4 LT	59	out:
	60	return error;
	61	}
	62
26689452	63	SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct __user *, arg)
1da177e4 LT	64	{
	65	struct mmap_arg_struct a;
	66	long error = -EFAULT;
	67
	68	if (copy_from_user(&a, arg, sizeof(a)))
	69	goto out;
	70
	71	error = -EINVAL;
	72	if (a.offset & ~PAGE_MASK)
	73	goto out;
	74
f8b72560	75	error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
1da177e4 LT	76	out:
	77	return error;
	78	}
	79
1da177e4 LT	80	/*
	81	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	82	*
	83	* This is really horribly ugly.
	84	*/
26689452 HC	85	SYSCALL_DEFINE5(ipc, uint, call, int, first, unsigned long, second,
26689452 HC	86	unsigned long, third, void __user *, ptr)
1da177e4 LT	87	{
	88	struct ipc_kludge tmp;
	89	int ret;
	90
	91	switch (call) {
	92	case SEMOP:
	93	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	94	(unsigned)second, NULL);
	95	case SEMTIMEDOP:
	96	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	97	(unsigned)second,
	98	(const struct timespec __user *) third);
	99	case SEMGET:
	100	return sys_semget(first, (int)second, third);
	101	case SEMCTL: {
	102	union semun fourth;
	103	if (!ptr)
	104	return -EINVAL;
	105	if (get_user(fourth.__pad, (void __user * __user *) ptr))
	106	return -EFAULT;
	107	return sys_semctl(first, (int)second, third, fourth);
	108	}
	109	case MSGSND:
	110	return sys_msgsnd (first, (struct msgbuf __user *) ptr,
	111	(size_t)second, third);
	112	break;
	113	case MSGRCV:
	114	if (!ptr)
	115	return -EINVAL;
	116	if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr,
	117	sizeof (struct ipc_kludge)))
	118	return -EFAULT;
	119	return sys_msgrcv (first, tmp.msgp,
	120	(size_t)second, tmp.msgtyp, third);
	121	case MSGGET:
	122	return sys_msgget((key_t)first, (int)second);
	123	case MSGCTL:
	124	return sys_msgctl(first, (int)second,
	125	(struct msqid_ds __user *)ptr);
	126
	127	case SHMAT: {
	128	ulong raddr;
	129	ret = do_shmat(first, (char __user *)ptr,
	130	(int)second, &raddr);
	131	if (ret)
	132	return ret;
	133	return put_user (raddr, (ulong __user *) third);
	134	break;
	135	}
	136	case SHMDT:
	137	return sys_shmdt ((char __user *)ptr);
	138	case SHMGET:
	139	return sys_shmget(first, (size_t)second, third);
	140	case SHMCTL:
	141	return sys_shmctl(first, (int)second,
	142	(struct shmid_ds __user *) ptr);
	143	default:
	144	return -ENOSYS;
	145
	146	}
	147
	148	return -EINVAL;
	149	}
	150
347a8dc3	151	#ifdef CONFIG_64BIT
26689452	152	SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name)
1da177e4 LT	153	{
	154	int ret = sys_newuname(name);
	155
d2f019fe	156	if (personality(current->personality) == PER_LINUX32 && !ret) {
1da177e4 LT	157	ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
	158	if (ret) ret = -EFAULT;
	159	}
	160	return ret;
	161	}
	162
26689452	163	SYSCALL_DEFINE1(s390_personality, unsigned long, personality)
1da177e4 LT	164	{
	165	int ret;
	166
	167	if (current->personality == PER_LINUX32 && personality == PER_LINUX)
	168	personality = PER_LINUX32;
	169	ret = sys_personality(personality);
	170	if (ret == PER_LINUX32)
	171	ret = PER_LINUX;
	172
	173	return ret;
	174	}
347a8dc3	175	#endif /* CONFIG_64BIT */
1da177e4 LT	176
	177	/*
	178	* Wrapper function for sys_fadvise64/fadvise64_64
	179	*/
347a8dc3	180	#ifndef CONFIG_64BIT
1da177e4	181
26689452 HC	182	SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
26689452 HC	183	size_t, len, int, advice)
1da177e4 LT	184	{
	185	return sys_fadvise64(fd, (u64) offset_high << 32 \| offset_low,
	186	len, advice);
	187	}
	188
1da177e4 LT	189	struct fadvise64_64_args {
	190	int fd;
	191	long long offset;
	192	long long len;
	193	int advice;
	194	};
	195
26689452	196	SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
1da177e4 LT	197	{
	198	struct fadvise64_64_args a;
	199
	200	if ( copy_from_user(&a, args, sizeof(a)) )
	201	return -EFAULT;
	202	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	203	}
7a8e0c8d	204
7a8e0c8d MS	205	/*
	206	* This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
	207	* 64 bit argument "len" is split into the upper and lower 32 bits. The
	208	* system call wrapper in the user space loads the value to %r6/%r7.
	209	* The code in entry.S keeps the values in %r2 - %r6 where they are and
	210	* stores %r7 to 96(%r15). But the standard C linkage requires that
	211	* the whole 64 bit value for len is stored on the stack and doesn't
	212	* use %r6 at all. So s390_fallocate has to convert the arguments from
	213	* %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
	214	* to
	215	* %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
	216	*/
26689452	217	SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
7a8e0c8d MS	218	u32 len_high, u32 len_low)
	219	{
	220	return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) \| len_low);
	221	}
26689452 HC	222	#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
	223	asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset,
	224	long len_high, long len_low)
	225	{
	226	return SYSC_s390_fallocate((int) fd, (int) mode, offset,
	227	(u32) len_high, (u32) len_low);
	228	}
	229	SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate);
	230	#endif
	231
7a8e0c8d	232	#endif