[deliverable/linux.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 <linux/ipc.h>

#include <asm/uaccess.h>

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

/* 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 hassle
 * 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);
}
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>
cba4fbbf	29	#include <linux/ipc.h>
1da177e4 LT	30
1da177e4 LT	31	#include <asm/uaccess.h>
1da177e4 LT	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
1da177e4 LT	37	/* common code for old and new mmaps */
	38	inline long do_mmap2(
	39	unsigned long addr, unsigned long len,
	40	unsigned long prot, unsigned long flags,
	41	unsigned long fd, unsigned long pgoff)
	42	{
	43	int error = -EINVAL;
	44	struct file * file = NULL;
	45
	46	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	47
6119be0b	48	if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
1da177e4 LT	49	goto out;
	50
	51	error = -EBADF;
	52	if (!(flags & MAP_ANONYMOUS)) {
	53	file = fget(fd);
	54	if (!file)
	55	goto out;
	56	}
	57
	58	down_write(&current->mm->mmap_sem);
	59	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	60	up_write(&current->mm->mmap_sem);
	61
	62	if (file)
	63	fput(file);
	64	out:
	65	return error;
	66	}
	67
	68	struct mmap_arg_struct {
	69	unsigned long addr;
	70	unsigned long len;
	71	unsigned long prot;
	72	unsigned long flags;
	73	unsigned long fd;
	74	unsigned long offset;
	75	};
	76
	77	asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
	78	{
	79	int error = -EFAULT;
	80	struct mmap_arg_struct a;
	81
	82	if (copy_from_user(&a, arg, sizeof(a)))
	83	goto out;
	84
	85	error = -EINVAL;
	86	if (a.offset & ~PAGE_MASK)
	87	goto out;
	88
	89	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
	90	out:
	91	return error;
	92	}
	93
	94	asmlinkage unsigned long
	95	sys_arm_mremap(unsigned long addr, unsigned long old_len,
	96	unsigned long new_len, unsigned long flags,
	97	unsigned long new_addr)
	98	{
	99	unsigned long ret = -EINVAL;
	100
6119be0b	101	if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
1da177e4 LT	102	goto out;
	103
	104	down_write(&current->mm->mmap_sem);
	105	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
	106	up_write(&current->mm->mmap_sem);
	107
	108	out:
	109	return ret;
	110	}
	111
	112	/*
	113	* Perform the select(nd, in, out, ex, tv) and mmap() system
	114	* calls.
	115	*/
	116
	117	struct sel_arg_struct {
	118	unsigned long n;
	119	fd_set __user inp, outp, *exp;
	120	struct timeval __user *tvp;
	121	};
	122
	123	asmlinkage int old_select(struct sel_arg_struct __user *arg)
	124	{
	125	struct sel_arg_struct a;
	126
	127	if (copy_from_user(&a, arg, sizeof(a)))
	128	return -EFAULT;
	129	/* sys_select() does the appropriate kernel locking */
	130	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
	131	}
	132
dd35afc2	133	#if !defined(CONFIG_AEABI) \|\| defined(CONFIG_OABI_COMPAT)
1da177e4 LT	134	/*
	135	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	136	*
	137	* This is really horribly ugly.
	138	*/
	139	asmlinkage int sys_ipc(uint call, int first, int second, int third,
	140	void __user *ptr, long fifth)
	141	{
	142	int version, ret;
	143
	144	version = call >> 16; /* hack for backward compatibility */
	145	call &= 0xffff;
	146
	147	switch (call) {
	148	case SEMOP:
	149	return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
	150	case SEMTIMEDOP:
	151	return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
	152	(const struct timespec __user *)fifth);
	153
	154	case SEMGET:
	155	return sys_semget (first, second, third);
	156	case SEMCTL: {
	157	union semun fourth;
	158	if (!ptr)
	159	return -EINVAL;
	160	if (get_user(fourth.__pad, (void __user * __user *) ptr))
	161	return -EFAULT;
	162	return sys_semctl (first, second, third, fourth);
	163	}
	164
	165	case MSGSND:
	166	return sys_msgsnd(first, (struct msgbuf __user *) ptr,
	167	second, third);
	168	case MSGRCV:
	169	switch (version) {
	170	case 0: {
	171	struct ipc_kludge tmp;
	172	if (!ptr)
	173	return -EINVAL;
	174	if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
	175	sizeof (tmp)))
	176	return -EFAULT;
	177	return sys_msgrcv (first, tmp.msgp, second,
	178	tmp.msgtyp, third);
	179	}
	180	default:
	181	return sys_msgrcv (first,
	182	(struct msgbuf __user *) ptr,
	183	second, fifth, third);
	184	}
	185	case MSGGET:
	186	return sys_msgget ((key_t) first, second);
	187	case MSGCTL:
	188	return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
	189
	190	case SHMAT:
	191	switch (version) {
	192	default: {
	193	ulong raddr;
	194	ret = do_shmat(first, (char __user *)ptr, second, &raddr);
	195	if (ret)
	196	return ret;
	197	return put_user(raddr, (ulong __user *)third);
198	}
199	case 1: /* Of course, we don't support iBCS2! */
200	return -EINVAL;
201	}
202	case SHMDT:
203	return sys_shmdt ((char __user *)ptr);
204	case SHMGET:
205	return sys_shmget (first, second, third);
206	case SHMCTL:
207	return sys_shmctl (first, second,
208	(struct shmid_ds __user *) ptr);
209	default:
210	return -ENOSYS;
211	}
212	}
dd35afc2	213	#endif
1da177e4	214
1da177e4 LT	215	/* Fork a new task - this creates a new program thread.
	216	* This is called indirectly via a small wrapper
	217	*/
	218	asmlinkage int sys_fork(struct pt_regs *regs)
	219	{
f24284ad	220	#ifdef CONFIG_MMU
1da177e4	221	return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
f24284ad HC	222	#else
	223	/* can not support in nommu mode */
	224	return(-EINVAL);
	225	#endif
1da177e4 LT	226	}
	227
	228	/* Clone a task - this clones the calling program thread.
	229	* This is called indirectly via a small wrapper
	230	*/
	231	asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
	232	int __user *parent_tidptr, int tls_val,
	233	int __user child_tidptr, struct pt_regs regs)
	234	{
	235	if (!newsp)
	236	newsp = regs->ARM_sp;
	237
	238	return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
	239	}
	240
	241	asmlinkage int sys_vfork(struct pt_regs *regs)
	242	{
	243	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
	244	}
	245
	246	/* sys_execve() executes a new program.
	247	* This is called indirectly via a small wrapper
	248	*/
	249	asmlinkage int sys_execve(char __user filenamei, char __user __user *argv,
	250	char __user * __user envp, struct pt_regs regs)
	251	{
	252	int error;
	253	char * filename;
	254
	255	filename = getname(filenamei);
	256	error = PTR_ERR(filename);
	257	if (IS_ERR(filename))
	258	goto out;
	259	error = do_execve(filename, argv, envp, regs);
	260	putname(filename);
	261	out:
	262	return error;
	263	}
	264
3db03b4a	265	int kernel_execve(const char filename, char const argv[], char *const envp[])
1da177e4 LT	266	{
	267	struct pt_regs regs;
	268	int ret;
	269
	270	memset(&regs, 0, sizeof(struct pt_regs));
	271	ret = do_execve((char )filename, (char __user __user *)argv,
	272	(char __user * __user *)envp, &regs);
	273	if (ret < 0)
	274	goto out;
	275
	276	/*
	277	* Save argc to the register structure for userspace.
	278	*/
	279	regs.ARM_r0 = ret;
	280
	281	/*
	282	* We were successful. We won't be returning to our caller, but
	283	* instead to user space by manipulating the kernel stack.
	284	*/
	285	asm( "add r0, %0, %1\n\t"
	286	"mov r1, %2\n\t"
	287	"mov r2, %3\n\t"
	288	"bl memmove\n\t" /* copy regs to top of stack */
	289	"mov r8, #0\n\t" /* not a syscall */
	290	"mov r9, %0\n\t" /* thread structure */
	291	"mov sp, r0\n\t" /* reposition stack pointer */
	292	"b ret_to_user"
	293	:
	294	: "r" (current_thread_info()),
4f7a1812	295	"Ir" (THREAD_START_SP - sizeof(regs)),
1da177e4 LT	296	"r" (&regs),
1da177e4 LT	297	"Ir" (sizeof(regs))
c2f48086	298	: "r0", "r1", "r2", "r3", "ip", "lr", "memory");
1da177e4 LT	299
	300	out:
	301	return ret;
	302	}
3db03b4a	303	EXPORT_SYMBOL(kernel_execve);
68d9102f NP	304
68d9102f NP	305	/*
6cbdc8c5	306	* Since loff_t is a 64 bit type we avoid a lot of ABI hassle
68d9102f NP	307	* with a different argument ordering.
	308	*/
	309	asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
	310	loff_t offset, loff_t len)
	311	{
	312	return sys_fadvise64_64(fd, offset, len, advice);
	313	}