[deliverable/linux.git] / arch / v850 / kernel / syscalls.c

/*
 * arch/v850/kernel/syscalls.c -- Various system-call definitions not
 * 	defined in machine-independent code
 *
 *  Copyright (C) 2001,02  NEC Corporation
 *  Copyright (C) 2001,02  Miles Bader <miles@gnu.org>
 *
 * 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.
 *
 * This file was derived the ppc version, arch/ppc/kernel/syscalls.c
 * ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas;
 *     modified by Cort Dougan (cort@cs.nmt.edu)
 *     and Paul Mackerras (paulus@cs.anu.edu.au).
 */

#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/sys.h>
#include <linux/ipc.h>
#include <linux/utsname.h>
#include <linux/file.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>

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

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

	ret = -EINVAL;
	switch (call) {
	case SEMOP:
		ret = sys_semop (first, (struct sembuf *)ptr, second);
		break;
	case SEMGET:
		ret = sys_semget (first, second, third);
		break;
	case SEMCTL:
	{
		union semun fourth;

		if (!ptr)
			break;
		if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
		    || (ret = get_user(fourth.__pad, (void **)ptr)))
			break;
		ret = sys_semctl (first, second, third, fourth);
		break;
	}
	case MSGSND:
		ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
		break;
	case MSGRCV:
		switch (version) {
		case 0: {
			struct ipc_kludge tmp;

			if (!ptr)
				break;
			if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
			    || (ret = copy_from_user(&tmp,
						(struct ipc_kludge *) ptr,
						sizeof (tmp))))
				break;
			ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
					  third);
			break;
			}
		default:
			ret = sys_msgrcv (first, (struct msgbuf *) ptr,
					  second, fifth, third);
			break;
		}
		break;
	case MSGGET:
		ret = sys_msgget ((key_t) first, second);
		break;
	case MSGCTL:
		ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
		break;
	case SHMAT:
		switch (version) {
		default: {
			ulong raddr;

			if ((ret = access_ok(VERIFY_WRITE, (ulong*) third,
					       sizeof(ulong)) ? 0 : -EFAULT))
				break;
			ret = do_shmat (first, (char *) ptr, second, &raddr);
			if (ret)
				break;
			ret = put_user (raddr, (ulong *) third);
			break;
			}
		case 1:	/* iBCS2 emulator entry point */
			if (!segment_eq(get_fs(), get_ds()))
				break;
			ret = do_shmat (first, (char *) ptr, second,
					 (ulong *) third);
			break;
		}
		break;
	case SHMDT: 
		ret = sys_shmdt ((char *)ptr);
		break;
	case SHMGET:
		ret = sys_shmget (first, second, third);
		break;
	case SHMCTL:
		ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
		break;
	}

	return ret;
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
int sys_pipe (int *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;
}

static inline unsigned long
do_mmap2 (unsigned long addr, size_t len,
	 unsigned long prot, unsigned long flags,
	 unsigned long fd, unsigned long pgoff)
{
	struct file * file = NULL;
	int ret = -EBADF;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (! (flags & MAP_ANONYMOUS)) {
		if (!(file = fget (fd)))
			goto out;
	}
	
	down_write (&current->mm->mmap_sem);
	ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff);
	up_write (&current->mm->mmap_sem);
	if (file)
		fput (file);
out:
	return ret;
}

unsigned long sys_mmap2 (unsigned long addr, size_t len,
			unsigned long prot, unsigned long flags,
			unsigned long fd, unsigned long pgoff)
{
	return do_mmap2 (addr, len, prot, flags, fd, pgoff);
}

unsigned long sys_mmap (unsigned long addr, size_t len,
		       unsigned long prot, unsigned long flags,
		       unsigned long fd, off_t offset)
{
	int err = -EINVAL;

	if (offset & ~PAGE_MASK)
		goto out;

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

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
	register char *__a __asm__ ("r6") = filename;
	register void *__b __asm__ ("r7") = argv;
	register void *__c __asm__ ("r8") = envp;
	register unsigned long __syscall __asm__ ("r12") = __NR_execve;
	register unsigned long __ret __asm__ ("r10");
	__asm__ __volatile__ ("trap 0"
			: "=r" (__ret), "=r" (__syscall)
			: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
			: "r1", "r5", "r11", "r13", "r14",
			  "r15", "r16", "r17", "r18", "r19");
	return __ret;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/v850/kernel/syscalls.c -- Various system-call definitions not
	3	* defined in machine-independent code
	4	*
	5	* Copyright (C) 2001,02 NEC Corporation
	6	* Copyright (C) 2001,02 Miles Bader <miles@gnu.org>
	7	*
	8	* This file is subject to the terms and conditions of the GNU General
	9	* Public License. See the file COPYING in the main directory of this
	10	* archive for more details.
	11	*
	12	* This file was derived the ppc version, arch/ppc/kernel/syscalls.c
	13	* ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas;
	14	* modified by Cort Dougan (cort@cs.nmt.edu)
	15	* and Paul Mackerras (paulus@cs.anu.edu.au).
	16	*/
	17
1da177e4 LT	18	#include <linux/errno.h>
	19	#include <linux/mm.h>
	20	#include <linux/smp.h>
1da177e4 LT	21	#include <linux/syscalls.h>
	22	#include <linux/sem.h>
	23	#include <linux/msg.h>
	24	#include <linux/shm.h>
	25	#include <linux/stat.h>
	26	#include <linux/mman.h>
	27	#include <linux/sys.h>
	28	#include <linux/ipc.h>
	29	#include <linux/utsname.h>
	30	#include <linux/file.h>
	31
	32	#include <asm/uaccess.h>
fe74290d	33	#include <asm/unistd.h>
1da177e4 LT	34
	35	/*
	36	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	37	*
	38	* This is really horribly ugly.
	39	*/
	40	int
	41	sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
	42	{
	43	int version, ret;
	44
	45	version = call >> 16; /* hack for backward compatibility */
	46	call &= 0xffff;
	47
	48	ret = -EINVAL;
	49	switch (call) {
	50	case SEMOP:
	51	ret = sys_semop (first, (struct sembuf *)ptr, second);
	52	break;
	53	case SEMGET:
	54	ret = sys_semget (first, second, third);
	55	break;
	56	case SEMCTL:
	57	{
	58	union semun fourth;
	59
	60	if (!ptr)
	61	break;
	62	if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
	63	\|\| (ret = get_user(fourth.__pad, (void **)ptr)))
	64	break;
	65	ret = sys_semctl (first, second, third, fourth);
	66	break;
	67	}
	68	case MSGSND:
	69	ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
	70	break;
	71	case MSGRCV:
	72	switch (version) {
	73	case 0: {
	74	struct ipc_kludge tmp;
	75
	76	if (!ptr)
	77	break;
	78	if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
	79	\|\| (ret = copy_from_user(&tmp,
	80	(struct ipc_kludge *) ptr,
	81	sizeof (tmp))))
	82	break;
	83	ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
	84	third);
	85	break;
	86	}
	87	default:
	88	ret = sys_msgrcv (first, (struct msgbuf *) ptr,
	89	second, fifth, third);
	90	break;
	91	}
	92	break;
	93	case MSGGET:
	94	ret = sys_msgget ((key_t) first, second);
	95	break;
	96	case MSGCTL:
	97	ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
98	break;
99	case SHMAT:
100	switch (version) {
101	default: {
102	ulong raddr;
103
104	if ((ret = access_ok(VERIFY_WRITE, (ulong*) third,
105	sizeof(ulong)) ? 0 : -EFAULT))
106	break;
107	ret = do_shmat (first, (char *) ptr, second, &raddr);
108	if (ret)
109	break;
110	ret = put_user (raddr, (ulong *) third);
111	break;
112	}
113	case 1: /* iBCS2 emulator entry point */
114	if (!segment_eq(get_fs(), get_ds()))
115	break;
116	ret = do_shmat (first, (char *) ptr, second,
117	(ulong *) third);
118	break;
119	}
120	break;
121	case SHMDT:
122	ret = sys_shmdt ((char *)ptr);
123	break;
124	case SHMGET:
125	ret = sys_shmget (first, second, third);
126	break;
127	case SHMCTL:
128	ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
129	break;
130	}
131
132	return ret;
133	}
134
135	/*
136	* sys_pipe() is the normal C calling standard for creating
137	* a pipe. It's not the way unix traditionally does this, though.
138	*/
139	int sys_pipe (int *fildes)
140	{
141	int fd[2];
142	int error;
143
144	error = do_pipe (fd);
145	if (!error) {
146	if (copy_to_user (fildes, fd, 2*sizeof (int)))
147	error = -EFAULT;
148	}
149	return error;
150	}
151
152	static inline unsigned long
153	do_mmap2 (unsigned long addr, size_t len,
154	unsigned long prot, unsigned long flags,
155	unsigned long fd, unsigned long pgoff)
156	{
157	struct file * file = NULL;
158	int ret = -EBADF;
159
160	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
161	if (! (flags & MAP_ANONYMOUS)) {
162	if (!(file = fget (fd)))
163	goto out;
164	}
165
166	down_write (&current->mm->mmap_sem);
167	ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff);
168	up_write (&current->mm->mmap_sem);
169	if (file)
170	fput (file);
171	out:
172	return ret;
173	}
174
175	unsigned long sys_mmap2 (unsigned long addr, size_t len,
176	unsigned long prot, unsigned long flags,
177	unsigned long fd, unsigned long pgoff)
178	{
179	return do_mmap2 (addr, len, prot, flags, fd, pgoff);
180	}
181
182	unsigned long sys_mmap (unsigned long addr, size_t len,
183	unsigned long prot, unsigned long flags,
184	unsigned long fd, off_t offset)
185	{
186	int err = -EINVAL;
187
188	if (offset & ~PAGE_MASK)
189	goto out;
190
191	err = do_mmap2 (addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
192	out:
193	return err;
194	}
fe74290d AB	195
	196	/*
	197	* Do a system call from kernel instead of calling sys_execve so we
	198	* end up with proper pt_regs.
	199	*/
	200	int kernel_execve(const char filename, char const argv[], char *const envp[])
	201	{
	202	register char *__a __asm__ ("r6") = filename;
	203	register void *__b __asm__ ("r7") = argv;
	204	register void *__c __asm__ ("r8") = envp;
	205	register unsigned long __syscall __asm__ ("r12") = __NR_execve;
	206	register unsigned long __ret __asm__ ("r10");
	207	__asm__ __volatile__ ("trap 0"
	208	: "=r" (__ret), "=r" (__syscall)
	209	: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
	210	: "r1", "r5", "r11", "r13", "r14",
	211	"r15", "r16", "r17", "r18", "r19");
	212	return __ret;
	213	}