[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);
}

/*
 * 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;
	}
}

/* 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)
{
	return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
}

/* 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;
}

long execve(const char *filename, char **argv, char **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", "memory");

 out:
	return ret;
}
EXPORT_SYMBOL(execve);
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
	150	/*
	151	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	152	*
	153	* This is really horribly ugly.
	154	*/
	155	asmlinkage int sys_ipc(uint call, int first, int second, int third,
	156	void __user *ptr, long fifth)
	157	{
	158	int version, ret;
	159
	160	version = call >> 16; /* hack for backward compatibility */
	161	call &= 0xffff;
	162
	163	switch (call) {
	164	case SEMOP:
	165	return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
	166	case SEMTIMEDOP:
	167	return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
	168	(const struct timespec __user *)fifth);
	169
	170	case SEMGET:
	171	return sys_semget (first, second, third);
	172	case SEMCTL: {
	173	union semun fourth;
	174	if (!ptr)
	175	return -EINVAL;
	176	if (get_user(fourth.__pad, (void __user * __user *) ptr))
	177	return -EFAULT;
	178	return sys_semctl (first, second, third, fourth);
	179	}
	180
	181	case MSGSND:
	182	return sys_msgsnd(first, (struct msgbuf __user *) ptr,
183	second, third);
184	case MSGRCV:
185	switch (version) {
186	case 0: {
187	struct ipc_kludge tmp;
188	if (!ptr)
189	return -EINVAL;
190	if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
191	sizeof (tmp)))
192	return -EFAULT;
193	return sys_msgrcv (first, tmp.msgp, second,
194	tmp.msgtyp, third);
195	}
196	default:
197	return sys_msgrcv (first,
198	(struct msgbuf __user *) ptr,
199	second, fifth, third);
200	}
201	case MSGGET:
202	return sys_msgget ((key_t) first, second);
203	case MSGCTL:
204	return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
205
206	case SHMAT:
207	switch (version) {
208	default: {
209	ulong raddr;
210	ret = do_shmat(first, (char __user *)ptr, second, &raddr);
211	if (ret)
212	return ret;
213	return put_user(raddr, (ulong __user *)third);
214	}
215	case 1: /* Of course, we don't support iBCS2! */
216	return -EINVAL;
217	}
218	case SHMDT:
219	return sys_shmdt ((char __user *)ptr);
220	case SHMGET:
221	return sys_shmget (first, second, third);
222	case SHMCTL:
223	return sys_shmctl (first, second,
224	(struct shmid_ds __user *) ptr);
225	default:
226	return -ENOSYS;
227	}
228	}
229
1da177e4 LT	230	/* Fork a new task - this creates a new program thread.
	231	* This is called indirectly via a small wrapper
	232	*/
	233	asmlinkage int sys_fork(struct pt_regs *regs)
	234	{
	235	return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
	236	}
	237
	238	/* Clone a task - this clones the calling program thread.
	239	* This is called indirectly via a small wrapper
	240	*/
	241	asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
	242	int __user *parent_tidptr, int tls_val,
	243	int __user child_tidptr, struct pt_regs regs)
	244	{
	245	if (!newsp)
	246	newsp = regs->ARM_sp;
	247
	248	return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
	249	}
	250
	251	asmlinkage int sys_vfork(struct pt_regs *regs)
	252	{
	253	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
	254	}
	255
	256	/* sys_execve() executes a new program.
	257	* This is called indirectly via a small wrapper
	258	*/
	259	asmlinkage int sys_execve(char __user filenamei, char __user __user *argv,
	260	char __user * __user envp, struct pt_regs regs)
	261	{
	262	int error;
	263	char * filename;
	264
	265	filename = getname(filenamei);
	266	error = PTR_ERR(filename);
	267	if (IS_ERR(filename))
	268	goto out;
	269	error = do_execve(filename, argv, envp, regs);
	270	putname(filename);
	271	out:
	272	return error;
	273	}
	274
	275	long execve(const char filename, char argv, char *envp)
	276	{
	277	struct pt_regs regs;
	278	int ret;
	279
	280	memset(&regs, 0, sizeof(struct pt_regs));
	281	ret = do_execve((char )filename, (char __user __user *)argv,
	282	(char __user * __user *)envp, &regs);
	283	if (ret < 0)
	284	goto out;
	285
	286	/*
	287	* Save argc to the register structure for userspace.
	288	*/
	289	regs.ARM_r0 = ret;
	290
	291	/*
	292	* We were successful. We won't be returning to our caller, but
	293	* instead to user space by manipulating the kernel stack.
294	*/
295	asm( "add r0, %0, %1\n\t"
296	"mov r1, %2\n\t"
297	"mov r2, %3\n\t"
298	"bl memmove\n\t" /* copy regs to top of stack */
299	"mov r8, #0\n\t" /* not a syscall */
300	"mov r9, %0\n\t" /* thread structure */
301	"mov sp, r0\n\t" /* reposition stack pointer */
302	"b ret_to_user"
303	:
304	: "r" (current_thread_info()),
4f7a1812	305	"Ir" (THREAD_START_SP - sizeof(regs)),
1da177e4 LT	306	"r" (&regs),
	307	"Ir" (sizeof(regs))
	308	: "r0", "r1", "r2", "r3", "ip", "memory");
	309
	310	out:
	311	return ret;
	312	}
	313	EXPORT_SYMBOL(execve);