[net-next-2.6.git] / arch / arm / kernel / sys_arm.c

/*
 *  linux/arch/arm/kernel/sys_arm.c
 *
 *  Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
 *  Copyright (C) 1995, 1996 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  This file contains various random system calls that
 *  have a non-standard calling sequence on the Linux/arm
 *  platform.
 */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mm.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/fs.h>
#include <linux/file.h>
#include <linux/utsname.h>

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

extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
			       unsigned long new_len, unsigned long flags,
			       unsigned long new_addr);

/*
 * 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 __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 */
inline long do_mmap2(
	unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	unsigned long fd, unsigned long pgoff)
{
	int error = -EINVAL;
	struct file * file = NULL;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

	if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
		goto out;

	error = -EBADF;
	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;
}

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

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

	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;
}

asmlinkage unsigned long
sys_arm_mremap(unsigned long addr, unsigned long old_len,
	       unsigned long new_len, unsigned long flags,
	       unsigned long new_addr)
{
	unsigned long ret = -EINVAL;

	if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
		goto out;

	down_write(&current->mm->mmap_sem);
	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
	up_write(&current->mm->mmap_sem);

out:
	return ret;
}

/*
 * Perform the select(nd, in, out, ex, tv) and mmap() system
 * calls.
 */

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

asmlinkage int 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);
}

#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
/*
 * 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;

	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);
	}

	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);

	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: /* Of course, we don't support iBCS2! */
			return -EINVAL;
		}
	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 -ENOSYS;
	}
}
#endif

/* Fork a new task - this creates a new program thread.
 * This is called indirectly via a small wrapper
 */
asmlinkage int sys_fork(struct pt_regs *regs)
{
#ifdef CONFIG_MMU
	return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
#else
	/* can not support in nommu mode */
	return(-EINVAL);
#endif
}

/* Clone a task - this clones the calling program thread.
 * This is called indirectly via a small wrapper
 */
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
			 int __user *parent_tidptr, int tls_val,
			 int __user *child_tidptr, struct pt_regs *regs)
{
	if (!newsp)
		newsp = regs->ARM_sp;

	return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
}

asmlinkage int sys_vfork(struct pt_regs *regs)
{
	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
}

/* sys_execve() executes a new program.
 * This is called indirectly via a small wrapper
 */
asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
			  char __user * __user *envp, struct pt_regs *regs)
{
	int error;
	char * filename;

	filename = getname(filenamei);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = do_execve(filename, argv, envp, regs);
	putname(filename);
out:
	return error;
}

int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
	struct pt_regs regs;
	int ret;

	memset(&regs, 0, sizeof(struct pt_regs));
	ret = do_execve((char *)filename, (char __user * __user *)argv,
			(char __user * __user *)envp, &regs);
	if (ret < 0)
		goto out;

	/*
	 * Save argc to the register structure for userspace.
	 */
	regs.ARM_r0 = ret;

	/*
	 * We were successful.  We won't be returning to our caller, but
	 * instead to user space by manipulating the kernel stack.
	 */
	asm(	"add	r0, %0, %1\n\t"
		"mov	r1, %2\n\t"
		"mov	r2, %3\n\t"
		"bl	memmove\n\t"	/* copy regs to top of stack */
		"mov	r8, #0\n\t"	/* not a syscall */
		"mov	r9, %0\n\t"	/* thread structure */
		"mov	sp, r0\n\t"	/* reposition stack pointer */
		"b	ret_to_user"
		:
		: "r" (current_thread_info()),
		  "Ir" (THREAD_START_SP - sizeof(regs)),
		  "r" (&regs),
		  "Ir" (sizeof(regs))
		: "r0", "r1", "r2", "r3", "ip", "lr", "memory");

 out:
	return ret;
}
EXPORT_SYMBOL(kernel_execve);

/*
 * Since loff_t is a 64 bit type we avoid a lot of ABI hastle
 * with a different argument ordering.
 */
asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
				     loff_t offset, loff_t len)
{
	return sys_fadvise64_64(fd, offset, len, advice);
}

/*
 * Yet more syscall fsckage - we can't fit sys_sync_file_range's
 * arguments into the available registers with EABI.  So, let's
 * create an ARM specific syscall for this which has _sane_
 * arguments.  (This incidentally also has an ABI-independent
 * argument layout.)
 */
asmlinkage long sys_arm_sync_file_range(int fd, unsigned int flags,
					loff_t offset, loff_t nbytes)
{
	return sys_sync_file_range(fd, offset, nbytes, flags);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/kernel/sys_arm.c
	3	*
	4	* Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
	5	* Copyright (C) 1995, 1996 Russell King.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This file contains various random system calls that
	12	* have a non-standard calling sequence on the Linux/arm
	13	* platform.
	14	*/
	15	#include <linux/module.h>
	16	#include <linux/errno.h>
	17	#include <linux/sched.h>
	18	#include <linux/slab.h>
	19	#include <linux/mm.h>
	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/fs.h>
	27	#include <linux/file.h>
	28	#include <linux/utsname.h>
	29
	30	#include <asm/uaccess.h>
	31	#include <asm/ipc.h>
	32
	33	extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
	34	unsigned long new_len, unsigned long flags,
	35	unsigned long new_addr);
	36
	37	/*
	38	* sys_pipe() is the normal C calling standard for creating
	39	* a pipe. It's not the way unix traditionally does this, though.
	40	*/
	41	asmlinkage int sys_pipe(unsigned long __user *fildes)
	42	{
	43	int fd[2];
	44	int error;
	45
	46	error = do_pipe(fd);
	47	if (!error) {
	48	if (copy_to_user(fildes, fd, 2*sizeof(int)))
	49	error = -EFAULT;
	50	}
	51	return error;
	52	}
	53
1da177e4 LT	54	/* common code for old and new mmaps */
	55	inline long do_mmap2(
	56	unsigned long addr, unsigned long len,
	57	unsigned long prot, unsigned long flags,
	58	unsigned long fd, unsigned long pgoff)
	59	{
	60	int error = -EINVAL;
	61	struct file * file = NULL;
	62
	63	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	64
6119be0b	65	if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
1da177e4 LT	66	goto out;
	67
	68	error = -EBADF;
	69	if (!(flags & MAP_ANONYMOUS)) {
	70	file = fget(fd);
	71	if (!file)
	72	goto out;
	73	}
	74
	75	down_write(&current->mm->mmap_sem);
	76	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	77	up_write(&current->mm->mmap_sem);
	78
	79	if (file)
	80	fput(file);
	81	out:
	82	return error;
	83	}
	84
	85	struct mmap_arg_struct {
	86	unsigned long addr;
	87	unsigned long len;
	88	unsigned long prot;
	89	unsigned long flags;
	90	unsigned long fd;
	91	unsigned long offset;
	92	};
	93
	94	asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
	95	{
	96	int error = -EFAULT;
	97	struct mmap_arg_struct a;
	98
	99	if (copy_from_user(&a, arg, sizeof(a)))
	100	goto out;
	101
	102	error = -EINVAL;
	103	if (a.offset & ~PAGE_MASK)
	104	goto out;
	105
	106	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
	107	out:
	108	return error;
	109	}
	110
	111	asmlinkage unsigned long
	112	sys_arm_mremap(unsigned long addr, unsigned long old_len,
	113	unsigned long new_len, unsigned long flags,
	114	unsigned long new_addr)
	115	{
	116	unsigned long ret = -EINVAL;
	117
6119be0b	118	if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
1da177e4 LT	119	goto out;
	120
	121	down_write(&current->mm->mmap_sem);
	122	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
	123	up_write(&current->mm->mmap_sem);
	124
	125	out:
	126	return ret;
	127	}
	128
	129	/*
	130	* Perform the select(nd, in, out, ex, tv) and mmap() system
	131	* calls.
	132	*/
	133
	134	struct sel_arg_struct {
	135	unsigned long n;
	136	fd_set __user inp, outp, *exp;
	137	struct timeval __user *tvp;
	138	};
	139
	140	asmlinkage int old_select(struct sel_arg_struct __user *arg)
	141	{
	142	struct sel_arg_struct a;
	143
	144	if (copy_from_user(&a, arg, sizeof(a)))
	145	return -EFAULT;
	146	/* sys_select() does the appropriate kernel locking */
	147	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
	148	}
	149
dd35afc2	150	#if !defined(CONFIG_AEABI) \|\| defined(CONFIG_OABI_COMPAT)
1da177e4 LT	151	/*
	152	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	153	*
	154	* This is really horribly ugly.
	155	*/
	156	asmlinkage int sys_ipc(uint call, int first, int second, int third,
	157	void __user *ptr, long fifth)
	158	{
	159	int version, ret;
	160
	161	version = call >> 16; /* hack for backward compatibility */
	162	call &= 0xffff;
	163
	164	switch (call) {
	165	case SEMOP:
	166	return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
	167	case SEMTIMEDOP:
	168	return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
	169	(const struct timespec __user *)fifth);
	170
	171	case SEMGET:
	172	return sys_semget (first, second, third);
	173	case SEMCTL: {
	174	union semun fourth;
	175	if (!ptr)
	176	return -EINVAL;
	177	if (get_user(fourth.__pad, (void __user * __user *) ptr))
	178	return -EFAULT;
	179	return sys_semctl (first, second, third, fourth);
	180	}
	181
	182	case MSGSND:
	183	return sys_msgsnd(first, (struct msgbuf __user *) ptr,
	184	second, third);
	185	case MSGRCV:
	186	switch (version) {
	187	case 0: {
	188	struct ipc_kludge tmp;
	189	if (!ptr)
	190	return -EINVAL;
	191	if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
	192	sizeof (tmp)))
	193	return -EFAULT;
	194	return sys_msgrcv (first, tmp.msgp, second,
	195	tmp.msgtyp, third);
	196	}
	197	default:
	198	return sys_msgrcv (first,
	199	(struct msgbuf __user *) ptr,
	200	second, fifth, third);
	201	}
	202	case MSGGET:
	203	return sys_msgget ((key_t) first, second);
	204	case MSGCTL:
	205	return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
	206
	207	case SHMAT:
	208	switch (version) {
	209	default: {
	210	ulong raddr;
	211	ret = do_shmat(first, (char __user *)ptr, second, &raddr);
	212	if (ret)
	213	return ret;
	214	return put_user(raddr, (ulong __user *)third);
215	}
216	case 1: /* Of course, we don't support iBCS2! */
217	return -EINVAL;
218	}
219	case SHMDT:
220	return sys_shmdt ((char __user *)ptr);
221	case SHMGET:
222	return sys_shmget (first, second, third);
223	case SHMCTL:
224	return sys_shmctl (first, second,
225	(struct shmid_ds __user *) ptr);
226	default:
227	return -ENOSYS;
228	}
229	}
dd35afc2	230	#endif
1da177e4	231
1da177e4 LT	232	/* Fork a new task - this creates a new program thread.
	233	* This is called indirectly via a small wrapper
	234	*/
	235	asmlinkage int sys_fork(struct pt_regs *regs)
	236	{
f24284ad	237	#ifdef CONFIG_MMU
1da177e4	238	return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
f24284ad HC	239	#else
	240	/* can not support in nommu mode */
	241	return(-EINVAL);
	242	#endif
1da177e4 LT	243	}
	244
	245	/* Clone a task - this clones the calling program thread.
	246	* This is called indirectly via a small wrapper
	247	*/
	248	asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
	249	int __user *parent_tidptr, int tls_val,
	250	int __user child_tidptr, struct pt_regs regs)
	251	{
	252	if (!newsp)
	253	newsp = regs->ARM_sp;
	254
	255	return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
	256	}
	257
	258	asmlinkage int sys_vfork(struct pt_regs *regs)
	259	{
	260	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
	261	}
	262
	263	/* sys_execve() executes a new program.
	264	* This is called indirectly via a small wrapper
	265	*/
	266	asmlinkage int sys_execve(char __user filenamei, char __user __user *argv,
	267	char __user * __user envp, struct pt_regs regs)
	268	{
	269	int error;
	270	char * filename;
	271
	272	filename = getname(filenamei);
	273	error = PTR_ERR(filename);
	274	if (IS_ERR(filename))
	275	goto out;
	276	error = do_execve(filename, argv, envp, regs);
	277	putname(filename);
	278	out:
	279	return error;
	280	}
	281
3db03b4a	282	int kernel_execve(const char filename, char const argv[], char *const envp[])
1da177e4 LT	283	{
	284	struct pt_regs regs;
	285	int ret;
	286
	287	memset(&regs, 0, sizeof(struct pt_regs));
	288	ret = do_execve((char )filename, (char __user __user *)argv,
	289	(char __user * __user *)envp, &regs);
	290	if (ret < 0)
	291	goto out;
	292
	293	/*
	294	* Save argc to the register structure for userspace.
	295	*/
	296	regs.ARM_r0 = ret;
	297
	298	/*
	299	* We were successful. We won't be returning to our caller, but
	300	* instead to user space by manipulating the kernel stack.
	301	*/
	302	asm( "add r0, %0, %1\n\t"
	303	"mov r1, %2\n\t"
	304	"mov r2, %3\n\t"
	305	"bl memmove\n\t" /* copy regs to top of stack */
	306	"mov r8, #0\n\t" /* not a syscall */
	307	"mov r9, %0\n\t" /* thread structure */
	308	"mov sp, r0\n\t" /* reposition stack pointer */
	309	"b ret_to_user"
	310	:
	311	: "r" (current_thread_info()),
4f7a1812	312	"Ir" (THREAD_START_SP - sizeof(regs)),
1da177e4 LT	313	"r" (&regs),
1da177e4 LT	314	"Ir" (sizeof(regs))
c2f48086	315	: "r0", "r1", "r2", "r3", "ip", "lr", "memory");
1da177e4 LT	316
	317	out:
	318	return ret;
	319	}
3db03b4a	320	EXPORT_SYMBOL(kernel_execve);
68d9102f NP	321
	322	/*
	323	* Since loff_t is a 64 bit type we avoid a lot of ABI hastle
	324	* with a different argument ordering.
	325	*/
	326	asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
	327	loff_t offset, loff_t len)
	328	{
	329	return sys_fadvise64_64(fd, offset, len, advice);
	330	}
5a059f1a RK	331
	332	/*
	333	* Yet more syscall fsckage - we can't fit sys_sync_file_range's
	334	* arguments into the available registers with EABI. So, let's
	335	* create an ARM specific syscall for this which has _sane_
	336	* arguments. (This incidentally also has an ABI-independent
	337	* argument layout.)
	338	*/
	339	asmlinkage long sys_arm_sync_file_range(int fd, unsigned int flags,
	340	loff_t offset, loff_t nbytes)
	341	{
	342	return sys_sync_file_range(fd, offset, nbytes, flags);
	343	}