[mirror_ubuntu-bionic-kernel.git] / arch / mips / kernel / linux32.c

/*
 * Conversion between 32-bit and 64-bit native system calls.
 *
 * Copyright (C) 2000 Silicon Graphics, Inc.
 * Written by Ulf Carlsson (ulfc@engr.sgi.com)
 * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
 */
#include <linux/compiler.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/smp_lock.h>
#include <linux/highuid.h>
#include <linux/resource.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/times.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/filter.h>
#include <linux/shm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/utime.h>
#include <linux/utsname.h>
#include <linux/personality.h>
#include <linux/dnotify.h>
#include <linux/module.h>
#include <linux/binfmts.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ipc.h>

#include <net/sock.h>
#include <net/scm.h>

#include <asm/compat-signal.h>
#include <asm/sim.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/mman.h>

/* Use this to get at 32-bit user passed pointers. */
/* A() macro should be used for places where you e.g.
   have some internal variable u32 and just want to get
   rid of a compiler warning. AA() has to be used in
   places where you want to convert a function argument
   to 32bit pointer or when you e.g. access pt_regs
   structure and want to consider 32bit registers only.
 */
#define A(__x) ((unsigned long)(__x))
#define AA(__x) ((unsigned long)((int)__x))

#ifdef __MIPSEB__
#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
#endif
#ifdef __MIPSEL__
#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
#endif

asmlinkage unsigned long
sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
         unsigned long flags, unsigned long fd, unsigned long pgoff)
{
	struct file * file = NULL;
	unsigned long error;

	error = -EINVAL;
	if (pgoff & (~PAGE_MASK >> 12))
		goto out;
	pgoff >>= PAGE_SHIFT-12;

	if (!(flags & MAP_ANONYMOUS)) {
		error = -EBADF;
		file = fget(fd);
		if (!file)
			goto out;
	}
	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

	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;
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
{
	int error;
	char * filename;

	filename = getname(compat_ptr(regs.regs[4]));
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
				 compat_ptr(regs.regs[6]), &regs);
	putname(filename);

out:
	return error;
}

#define RLIM_INFINITY32	0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)

struct rlimit32 {
	int	rlim_cur;
	int	rlim_max;
};

asmlinkage long sys32_truncate64(const char __user * path,
	unsigned long __dummy, int a2, int a3)
{
	return sys_truncate(path, merge_64(a2, a3));
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
	int a2, int a3)
{
	return sys_ftruncate(fd, merge_64(a2, a3));
}

static inline long
get_tv32(struct timeval *o, struct compat_timeval __user *i)
{
	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
		(__get_user(o->tv_sec, &i->tv_sec) |
		 __get_user(o->tv_usec, &i->tv_usec)));
}

static inline long
put_tv32(struct compat_timeval __user *o, struct timeval *i)
{
	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
		(__put_user(i->tv_sec, &o->tv_sec) |
		 __put_user(i->tv_usec, &o->tv_usec)));
}

extern struct timezone sys_tz;

asmlinkage int
sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
	if (tv) {
		struct timeval ktv;
		do_gettimeofday(&ktv);
		if (put_tv32(tv, &ktv))
			return -EFAULT;
	}
	if (tz) {
		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
			return -EFAULT;
	}
	return 0;
}

static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
{
	long usec;

	if (!access_ok(VERIFY_READ, i, sizeof(*i)))
		return -EFAULT;
	if (__get_user(o->tv_sec, &i->tv_sec))
		return -EFAULT;
	if (__get_user(usec, &i->tv_usec))
		return -EFAULT;
	o->tv_nsec = usec * 1000;
		return 0;
}

asmlinkage int
sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
	struct timespec kts;
	struct timezone ktz;

 	if (tv) {
		if (get_ts32(&kts, tv))
			return -EFAULT;
	}
	if (tz) {
		if (copy_from_user(&ktz, tz, sizeof(ktz)))
			return -EFAULT;
	}

	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

asmlinkage int sys32_llseek(unsigned int fd, unsigned int offset_high,
			    unsigned int offset_low, loff_t __user * result,
			    unsigned int origin)
{
	return sys_llseek(fd, offset_high, offset_low, result, origin);
}

/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
   lseek back to original location.  They fail just like lseek does on
   non-seekable files.  */

asmlinkage ssize_t sys32_pread(unsigned int fd, char __user * buf,
			       size_t count, u32 unused, u64 a4, u64 a5)
{
	return sys_pread64(fd, buf, count, merge_64(a4, a5));
}

asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char __user * buf,
			        size_t count, u32 unused, u64 a4, u64 a5)
{
	return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
}

asmlinkage int sys32_sched_rr_get_interval(compat_pid_t pid,
	struct compat_timespec __user *interval)
{
	struct timespec t;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
	set_fs(old_fs);
	if (put_user (t.tv_sec, &interval->tv_sec) ||
	    __put_user(t.tv_nsec, &interval->tv_nsec))
		return -EFAULT;
	return ret;
}

#ifdef CONFIG_SYSVIPC

asmlinkage long
sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
{
	int version, err;

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

	switch (call) {
	case SEMOP:
		/* struct sembuf is the same on 32 and 64bit :)) */
		err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
		break;
	case SEMTIMEDOP:
		err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
					    compat_ptr(fifth));
		break;
	case SEMGET:
		err = sys_semget(first, second, third);
		break;
	case SEMCTL:
		err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
		break;
	case MSGSND:
		err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
		break;
	case MSGRCV:
		err = compat_sys_msgrcv(first, second, fifth, third,
					version, compat_ptr(ptr));
		break;
	case MSGGET:
		err = sys_msgget((key_t) first, second);
		break;
	case MSGCTL:
		err = compat_sys_msgctl(first, second, compat_ptr(ptr));
		break;
	case SHMAT:
		err = compat_sys_shmat(first, second, third, version,
				       compat_ptr(ptr));
		break;
	case SHMDT:
		err = sys_shmdt(compat_ptr(ptr));
		break;
	case SHMGET:
		err = sys_shmget(first, (unsigned)second, third);
		break;
	case SHMCTL:
		err = compat_sys_shmctl(first, second, compat_ptr(ptr));
		break;
	default:
		err = -EINVAL;
		break;
	}

	return err;
}

#else

asmlinkage long
sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
{
	return -ENOSYS;
}

#endif /* CONFIG_SYSVIPC */

#ifdef CONFIG_MIPS32_N32
asmlinkage long sysn32_semctl(int semid, int semnum, int cmd, u32 arg)
{
	/* compat_sys_semctl expects a pointer to union semun */
	u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
	if (put_user(arg, uptr))
		return -EFAULT;
	return compat_sys_semctl(semid, semnum, cmd, uptr);
}

asmlinkage long sysn32_msgsnd(int msqid, u32 msgp, unsigned msgsz, int msgflg)
{
	return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
}

asmlinkage long sysn32_msgrcv(int msqid, u32 msgp, size_t msgsz, int msgtyp,
			      int msgflg)
{
	return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
				 compat_ptr(msgp));
}
#endif

struct sysctl_args32
{
	compat_caddr_t name;
	int nlen;
	compat_caddr_t oldval;
	compat_caddr_t oldlenp;
	compat_caddr_t newval;
	compat_size_t newlen;
	unsigned int __unused[4];
};

#ifdef CONFIG_SYSCTL_SYSCALL

asmlinkage long sys32_sysctl(struct sysctl_args32 __user *args)
{
	struct sysctl_args32 tmp;
	int error;
	size_t oldlen;
	size_t __user *oldlenp = NULL;
	unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;

	if (copy_from_user(&tmp, args, sizeof(tmp)))
		return -EFAULT;

	if (tmp.oldval && tmp.oldlenp) {
		/* Duh, this is ugly and might not work if sysctl_args
		   is in read-only memory, but do_sysctl does indirectly
		   a lot of uaccess in both directions and we'd have to
		   basically copy the whole sysctl.c here, and
		   glibc's __sysctl uses rw memory for the structure
		   anyway.  */
		if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
		    put_user(oldlen, (size_t __user *)addr))
			return -EFAULT;
		oldlenp = (size_t __user *)addr;
	}

	lock_kernel();
	error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
			  oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
	unlock_kernel();
	if (oldlenp) {
		if (!error) {
			if (get_user(oldlen, (size_t __user *)addr) ||
			    put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
				error = -EFAULT;
		}
		copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
	}
	return error;
}

#endif /* CONFIG_SYSCTL_SYSCALL */

asmlinkage long sys32_newuname(struct new_utsname __user * name)
{
	int ret = 0;

	down_read(&uts_sem);
	if (copy_to_user(name, utsname(), sizeof *name))
		ret = -EFAULT;
	up_read(&uts_sem);

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

	return ret;
}

asmlinkage int sys32_personality(unsigned long personality)
{
	int ret;
	personality &= 0xffffffff;
	if (personality(current->personality) == PER_LINUX32 &&
	    personality == PER_LINUX)
		personality = PER_LINUX32;
	ret = sys_personality(personality);
	if (ret == PER_LINUX32)
		ret = PER_LINUX;
	return ret;
}

/* ustat compatibility */
struct ustat32 {
	compat_daddr_t	f_tfree;
	compat_ino_t	f_tinode;
	char		f_fname[6];
	char		f_fpack[6];
};

extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf);

asmlinkage int sys32_ustat(dev_t dev, struct ustat32 __user * ubuf32)
{
	int err;
	struct ustat tmp;
	struct ustat32 tmp32;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	err = sys_ustat(dev, (struct ustat __user *)&tmp);
	set_fs(old_fs);

	if (err)
		goto out;

	memset(&tmp32, 0, sizeof(struct ustat32));
	tmp32.f_tfree = tmp.f_tfree;
	tmp32.f_tinode = tmp.f_tinode;

	err = copy_to_user(ubuf32, &tmp32, sizeof(struct ustat32)) ? -EFAULT : 0;

out:
	return err;
}

asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
	s32 count)
{
	mm_segment_t old_fs = get_fs();
	int ret;
	off_t of;

	if (offset && get_user(of, offset))
		return -EFAULT;

	set_fs(KERNEL_DS);
	ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
	set_fs(old_fs);

	if (offset && put_user(of, offset))
		return -EFAULT;

	return ret;
}

asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
                                   size_t count)
{
	return sys_readahead(fd, merge_64(a2, a3), count);
}

asmlinkage long sys32_sync_file_range(int fd, int __pad,
	unsigned long a2, unsigned long a3,
	unsigned long a4, unsigned long a5,
	int flags)
{
	return sys_sync_file_range(fd,
			merge_64(a2, a3), merge_64(a4, a5),
			flags);
}

asmlinkage long sys32_fadvise64_64(int fd, int __pad,
	unsigned long a2, unsigned long a3,
	unsigned long a4, unsigned long a5,
	int flags)
{
	return sys_fadvise64_64(fd,
			merge_64(a2, a3), merge_64(a4, a5),
			flags);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
{
	return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
	                     merge_64(len_a4, len_a5));
}

save_static_function(sys32_clone);
static int noinline __used
_sys32_clone(nabi_no_regargs struct pt_regs regs)
{
	unsigned long clone_flags;
	unsigned long newsp;
	int __user *parent_tidptr, *child_tidptr;

	clone_flags = regs.regs[4];
	newsp = regs.regs[5];
	if (!newsp)
		newsp = regs.regs[29];
	parent_tidptr = (int __user *) regs.regs[6];

	/* Use __dummy4 instead of getting it off the stack, so that
	   syscall() works.  */
	child_tidptr = (int __user *) __dummy4;
	return do_fork(clone_flags, newsp, &regs, 0,
	               parent_tidptr, child_tidptr);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Conversion between 32-bit and 64-bit native system calls.
	3	*
	4	* Copyright (C) 2000 Silicon Graphics, Inc.
	5	* Written by Ulf Carlsson (ulfc@engr.sgi.com)
	6	* sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
	7	*/
1da177e4 LT	8	#include <linux/compiler.h>
	9	#include <linux/mm.h>
	10	#include <linux/errno.h>
	11	#include <linux/file.h>
	12	#include <linux/smp_lock.h>
	13	#include <linux/highuid.h>
1da177e4 LT	14	#include <linux/resource.h>
	15	#include <linux/highmem.h>
	16	#include <linux/time.h>
	17	#include <linux/times.h>
	18	#include <linux/poll.h>
	19	#include <linux/slab.h>
	20	#include <linux/skbuff.h>
	21	#include <linux/filter.h>
	22	#include <linux/shm.h>
	23	#include <linux/sem.h>
	24	#include <linux/msg.h>
	25	#include <linux/icmpv6.h>
	26	#include <linux/syscalls.h>
	27	#include <linux/sysctl.h>
	28	#include <linux/utime.h>
	29	#include <linux/utsname.h>
	30	#include <linux/personality.h>
1da177e4 LT	31	#include <linux/dnotify.h>
	32	#include <linux/module.h>
	33	#include <linux/binfmts.h>
	34	#include <linux/security.h>
	35	#include <linux/compat.h>
	36	#include <linux/vfs.h>
cba4fbbf	37	#include <linux/ipc.h>
1da177e4 LT	38
	39	#include <net/sock.h>
	40	#include <net/scm.h>
	41
431dc804	42	#include <asm/compat-signal.h>
1da177e4 LT	43	#include <asm/sim.h>
	44	#include <asm/uaccess.h>
	45	#include <asm/mmu_context.h>
	46	#include <asm/mman.h>
	47
	48	/* Use this to get at 32-bit user passed pointers. */
	49	/* A() macro should be used for places where you e.g.
	50	have some internal variable u32 and just want to get
	51	rid of a compiler warning. AA() has to be used in
	52	places where you want to convert a function argument
	53	to 32bit pointer or when you e.g. access pt_regs
	54	structure and want to consider 32bit registers only.
	55	*/
	56	#define A(__x) ((unsigned long)(__x))
	57	#define AA(__x) ((unsigned long)((int)__x))
	58
	59	#ifdef __MIPSEB__
21a151d8	60	#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
1da177e4 LT	61	#endif
1da177e4 LT	62	#ifdef __MIPSEL__
21a151d8	63	#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
1da177e4 LT	64	#endif
1da177e4 LT	65
1da177e4 LT	66	asmlinkage unsigned long
	67	sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
	68	unsigned long flags, unsigned long fd, unsigned long pgoff)
	69	{
	70	struct file * file = NULL;
	71	unsigned long error;
	72
	73	error = -EINVAL;
947df17c PA	74	if (pgoff & (~PAGE_MASK >> 12))
	75	goto out;
	76	pgoff >>= PAGE_SHIFT-12;
	77
1da177e4 LT	78	if (!(flags & MAP_ANONYMOUS)) {
	79	error = -EBADF;
	80	file = fget(fd);
	81	if (!file)
	82	goto out;
	83	}
	84	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	85
	86	down_write(&current->mm->mmap_sem);
	87	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	88	up_write(&current->mm->mmap_sem);
	89	if (file)
	90	fput(file);
	91
	92	out:
	93	return error;
	94	}
	95
1da177e4 LT	96	/*
	97	* sys_execve() executes a new program.
	98	*/
	99	asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
	100	{
	101	int error;
	102	char * filename;
	103
	104	filename = getname(compat_ptr(regs.regs[4]));
	105	error = PTR_ERR(filename);
	106	if (IS_ERR(filename))
	107	goto out;
	108	error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
	109	compat_ptr(regs.regs[6]), &regs);
	110	putname(filename);
	111
	112	out:
	113	return error;
	114	}
	115
1da177e4 LT	116	#define RLIM_INFINITY32 0x7fffffff
	117	#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
	118
	119	struct rlimit32 {
	120	int rlim_cur;
	121	int rlim_max;
	122	};
	123
d4e9cffa RB	124	asmlinkage long sys32_truncate64(const char __user * path,
d4e9cffa RB	125	unsigned long __dummy, int a2, int a3)
1da177e4	126	{
d4e9cffa	127	return sys_truncate(path, merge_64(a2, a3));
1da177e4 LT	128	}
1da177e4 LT	129
1da177e4	130	asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
d4e9cffa	131	int a2, int a3)
1da177e4	132	{
d4e9cffa	133	return sys_ftruncate(fd, merge_64(a2, a3));
1da177e4 LT	134	}
	135
	136	static inline long
219ac73a	137	get_tv32(struct timeval o, struct compat_timeval __user i)
1da177e4 LT	138	{
	139	return (!access_ok(VERIFY_READ, i, sizeof(*i)) \|\|
	140	(__get_user(o->tv_sec, &i->tv_sec) \|
	141	__get_user(o->tv_usec, &i->tv_usec)));
	142	}
	143
	144	static inline long
219ac73a	145	put_tv32(struct compat_timeval __user o, struct timeval i)
1da177e4 LT	146	{
	147	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) \|\|
	148	(__put_user(i->tv_sec, &o->tv_sec) \|
	149	__put_user(i->tv_usec, &o->tv_usec)));
	150	}
	151
	152	extern struct timezone sys_tz;
	153
	154	asmlinkage int
219ac73a	155	sys32_gettimeofday(struct compat_timeval __user tv, struct timezone __user tz)
1da177e4 LT	156	{
	157	if (tv) {
	158	struct timeval ktv;
	159	do_gettimeofday(&ktv);
	160	if (put_tv32(tv, &ktv))
	161	return -EFAULT;
	162	}
	163	if (tz) {
	164	if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
	165	return -EFAULT;
	166	}
	167	return 0;
	168	}
	169
219ac73a	170	static inline long get_ts32(struct timespec o, struct compat_timeval __user i)
1da177e4 LT	171	{
	172	long usec;
	173
	174	if (!access_ok(VERIFY_READ, i, sizeof(*i)))
	175	return -EFAULT;
	176	if (__get_user(o->tv_sec, &i->tv_sec))
	177	return -EFAULT;
	178	if (__get_user(usec, &i->tv_usec))
	179	return -EFAULT;
	180	o->tv_nsec = usec * 1000;
	181	return 0;
	182	}
	183
	184	asmlinkage int
219ac73a	185	sys32_settimeofday(struct compat_timeval __user tv, struct timezone __user tz)
1da177e4 LT	186	{
	187	struct timespec kts;
	188	struct timezone ktz;
	189
	190	if (tv) {
	191	if (get_ts32(&kts, tv))
	192	return -EFAULT;
	193	}
	194	if (tz) {
	195	if (copy_from_user(&ktz, tz, sizeof(ktz)))
	196	return -EFAULT;
	197	}
	198
	199	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
	200	}
	201
	202	asmlinkage int sys32_llseek(unsigned int fd, unsigned int offset_high,
219ac73a	203	unsigned int offset_low, loff_t __user * result,
1da177e4 LT	204	unsigned int origin)
	205	{
	206	return sys_llseek(fd, offset_high, offset_low, result, origin);
	207	}
	208
	209	/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
	210	lseek back to original location. They fail just like lseek does on
	211	non-seekable files. */
	212
219ac73a	213	asmlinkage ssize_t sys32_pread(unsigned int fd, char __user * buf,
1da177e4 LT	214	size_t count, u32 unused, u64 a4, u64 a5)
1da177e4 LT	215	{
6ad0013b	216	return sys_pread64(fd, buf, count, merge_64(a4, a5));
1da177e4 LT	217	}
1da177e4 LT	218
219ac73a	219	asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char __user * buf,
1da177e4 LT	220	size_t count, u32 unused, u64 a4, u64 a5)
1da177e4 LT	221	{
6ad0013b	222	return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
1da177e4 LT	223	}
	224
	225	asmlinkage int sys32_sched_rr_get_interval(compat_pid_t pid,
219ac73a	226	struct compat_timespec __user *interval)
1da177e4 LT	227	{
	228	struct timespec t;
	229	int ret;
49a89efb	230	mm_segment_t old_fs = get_fs();
1da177e4	231
49a89efb	232	set_fs(KERNEL_DS);
219ac73a	233	ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
49a89efb	234	set_fs(old_fs);
1da177e4	235	if (put_user (t.tv_sec, &interval->tv_sec) \|\|
49a89efb	236	__put_user(t.tv_nsec, &interval->tv_nsec))
1da177e4 LT	237	return -EFAULT;
	238	return ret;
	239	}
	240
65f8ebe0 RB	241	#ifdef CONFIG_SYSVIPC
65f8ebe0 RB	242
1da177e4	243	asmlinkage long
49a89efb	244	sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
1da177e4 LT	245	{
	246	int version, err;
	247
	248	version = call >> 16; /* hack for backward compatibility */
	249	call &= 0xffff;
	250
	251	switch (call) {
	252	case SEMOP:
	253	/* struct sembuf is the same on 32 and 64bit :)) */
05e43966	254	err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
1da177e4 LT	255	break;
1da177e4 LT	256	case SEMTIMEDOP:
05e43966 AN	257	err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
05e43966 AN	258	compat_ptr(fifth));
1da177e4 LT	259	break;
1da177e4 LT	260	case SEMGET:
05e43966	261	err = sys_semget(first, second, third);
1da177e4 LT	262	break;
1da177e4 LT	263	case SEMCTL:
05e43966	264	err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
1da177e4	265	break;
1da177e4	266	case MSGSND:
05e43966	267	err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
1da177e4 LT	268	break;
1da177e4 LT	269	case MSGRCV:
05e43966 AN	270	err = compat_sys_msgrcv(first, second, fifth, third,
05e43966 AN	271	version, compat_ptr(ptr));
1da177e4 LT	272	break;
1da177e4 LT	273	case MSGGET:
05e43966	274	err = sys_msgget((key_t) first, second);
1da177e4 LT	275	break;
1da177e4 LT	276	case MSGCTL:
05e43966	277	err = compat_sys_msgctl(first, second, compat_ptr(ptr));
1da177e4	278	break;
1da177e4	279	case SHMAT:
05e43966 AN	280	err = compat_sys_shmat(first, second, third, version,
05e43966 AN	281	compat_ptr(ptr));
1da177e4 LT	282	break;
1da177e4 LT	283	case SHMDT:
05e43966	284	err = sys_shmdt(compat_ptr(ptr));
1da177e4 LT	285	break;
1da177e4 LT	286	case SHMGET:
05e43966	287	err = sys_shmget(first, (unsigned)second, third);
1da177e4 LT	288	break;
1da177e4 LT	289	case SHMCTL:
05e43966	290	err = compat_sys_shmctl(first, second, compat_ptr(ptr));
1da177e4 LT	291	break;
	292	default:
	293	err = -EINVAL;
	294	break;
	295	}
	296
	297	return err;
	298	}
	299
65f8ebe0 RB	300	#else
	301
	302	asmlinkage long
49a89efb	303	sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
65f8ebe0 RB	304	{
	305	return -ENOSYS;
	306	}
	307
	308	#endif /* CONFIG_SYSVIPC */
	309
05e43966	310	#ifdef CONFIG_MIPS32_N32
e16d8df0	311	asmlinkage long sysn32_semctl(int semid, int semnum, int cmd, u32 arg)
1da177e4	312	{
05e43966 AN	313	/* compat_sys_semctl expects a pointer to union semun */
05e43966 AN	314	u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
e16d8df0	315	if (put_user(arg, uptr))
05e43966 AN	316	return -EFAULT;
05e43966 AN	317	return compat_sys_semctl(semid, semnum, cmd, uptr);
1da177e4	318	}
e16d8df0 AN	319
	320	asmlinkage long sysn32_msgsnd(int msqid, u32 msgp, unsigned msgsz, int msgflg)
	321	{
	322	return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
	323	}
	324
	325	asmlinkage long sysn32_msgrcv(int msqid, u32 msgp, size_t msgsz, int msgtyp,
	326	int msgflg)
	327	{
	328	return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
	329	compat_ptr(msgp));
	330	}
05e43966	331	#endif
1da177e4 LT	332
	333	struct sysctl_args32
	334	{
	335	compat_caddr_t name;
	336	int nlen;
	337	compat_caddr_t oldval;
	338	compat_caddr_t oldlenp;
	339	compat_caddr_t newval;
	340	compat_size_t newlen;
	341	unsigned int __unused[4];
	342	};
	343
b89a8171	344	#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4	345
219ac73a	346	asmlinkage long sys32_sysctl(struct sysctl_args32 __user *args)
1da177e4 LT	347	{
	348	struct sysctl_args32 tmp;
	349	int error;
219ac73a AN	350	size_t oldlen;
	351	size_t __user *oldlenp = NULL;
	352	unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
1da177e4 LT	353
	354	if (copy_from_user(&tmp, args, sizeof(tmp)))
	355	return -EFAULT;
	356
	357	if (tmp.oldval && tmp.oldlenp) {
	358	/* Duh, this is ugly and might not work if sysctl_args
	359	is in read-only memory, but do_sysctl does indirectly
	360	a lot of uaccess in both directions and we'd have to
	361	basically copy the whole sysctl.c here, and
	362	glibc's __sysctl uses rw memory for the structure
	363	anyway. */
219ac73a AN	364	if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) \|\|
219ac73a AN	365	put_user(oldlen, (size_t __user *)addr))
1da177e4	366	return -EFAULT;
219ac73a	367	oldlenp = (size_t __user *)addr;
1da177e4 LT	368	}
	369
	370	lock_kernel();
219ac73a AN	371	error = do_sysctl((int __user )A(tmp.name), tmp.nlen, (void __user )A(tmp.oldval),
219ac73a AN	372	oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
1da177e4 LT	373	unlock_kernel();
	374	if (oldlenp) {
	375	if (!error) {
219ac73a AN	376	if (get_user(oldlen, (size_t __user *)addr) \|\|
219ac73a AN	377	put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
1da177e4 LT	378	error = -EFAULT;
	379	}
	380	copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
	381	}
	382	return error;
	383	}
	384
b89a8171	385	#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4	386
219ac73a	387	asmlinkage long sys32_newuname(struct new_utsname __user * name)
1da177e4 LT	388	{
	389	int ret = 0;
	390
	391	down_read(&uts_sem);
e9ff3990	392	if (copy_to_user(name, utsname(), sizeof *name))
1da177e4 LT	393	ret = -EFAULT;
	394	up_read(&uts_sem);
	395
	396	if (current->personality == PER_LINUX32 && !ret)
	397	if (copy_to_user(name->machine, "mips\0\0\0", 8))
	398	ret = -EFAULT;
	399
	400	return ret;
	401	}
	402
	403	asmlinkage int sys32_personality(unsigned long personality)
	404	{
	405	int ret;
53571ce4 TS	406	personality &= 0xffffffff;
	407	if (personality(current->personality) == PER_LINUX32 &&
	408	personality == PER_LINUX)
1da177e4 LT	409	personality = PER_LINUX32;
	410	ret = sys_personality(personality);
	411	if (ret == PER_LINUX32)
	412	ret = PER_LINUX;
	413	return ret;
	414	}
	415
	416	/* ustat compatibility */
	417	struct ustat32 {
	418	compat_daddr_t f_tfree;
	419	compat_ino_t f_tinode;
	420	char f_fname[6];
	421	char f_fpack[6];
	422	};
	423
219ac73a	424	extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf);
1da177e4	425
219ac73a	426	asmlinkage int sys32_ustat(dev_t dev, struct ustat32 __user * ubuf32)
1da177e4 LT	427	{
1da177e4 LT	428	int err;
e0daad44	429	struct ustat tmp;
1da177e4 LT	430	struct ustat32 tmp32;
	431	mm_segment_t old_fs = get_fs();
	432
	433	set_fs(KERNEL_DS);
219ac73a	434	err = sys_ustat(dev, (struct ustat __user *)&tmp);
49a89efb	435	set_fs(old_fs);
1da177e4 LT	436
	437	if (err)
	438	goto out;
	439
21a151d8	440	memset(&tmp32, 0, sizeof(struct ustat32));
e0daad44 RB	441	tmp32.f_tfree = tmp.f_tfree;
e0daad44 RB	442	tmp32.f_tinode = tmp.f_tinode;
1da177e4	443
21a151d8	444	err = copy_to_user(ubuf32, &tmp32, sizeof(struct ustat32)) ? -EFAULT : 0;
1da177e4 LT	445
	446	out:
	447	return err;
	448	}
	449
219ac73a	450	asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
1da177e4 LT	451	s32 count)
	452	{
	453	mm_segment_t old_fs = get_fs();
	454	int ret;
	455	off_t of;
42a3b4f2	456
1da177e4 LT	457	if (offset && get_user(of, offset))
1da177e4 LT	458	return -EFAULT;
42a3b4f2	459
1da177e4	460	set_fs(KERNEL_DS);
219ac73a	461	ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
1da177e4	462	set_fs(old_fs);
42a3b4f2	463
1da177e4 LT	464	if (offset && put_user(of, offset))
1da177e4 LT	465	return -EFAULT;
42a3b4f2	466
1da177e4 LT	467	return ret;
	468	}
	469
	470	asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
	471	size_t count)
	472	{
	473	return sys_readahead(fd, merge_64(a2, a3), count);
	474	}
	475
a8d587a7 RB	476	asmlinkage long sys32_sync_file_range(int fd, int __pad,
	477	unsigned long a2, unsigned long a3,
	478	unsigned long a4, unsigned long a5,
	479	int flags)
	480	{
	481	return sys_sync_file_range(fd,
	482	merge_64(a2, a3), merge_64(a4, a5),
	483	flags);
	484	}
	485
8676d2e0 AN	486	asmlinkage long sys32_fadvise64_64(int fd, int __pad,
	487	unsigned long a2, unsigned long a3,
	488	unsigned long a4, unsigned long a5,
	489	int flags)
	490	{
	491	return sys_fadvise64_64(fd,
	492	merge_64(a2, a3), merge_64(a4, a5),
	493	flags);
	494	}
	495
4dc46775 RB	496	asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
	497	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
	498	{
	499	return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
	500	merge_64(len_a4, len_a5));
	501	}
	502
3c37026d	503	save_static_function(sys32_clone);
f5dbeaf5	504	static int noinline __used
3c37026d RB	505	_sys32_clone(nabi_no_regargs struct pt_regs regs)
	506	{
	507	unsigned long clone_flags;
	508	unsigned long newsp;
	509	int __user parent_tidptr, child_tidptr;
	510
	511	clone_flags = regs.regs[4];
	512	newsp = regs.regs[5];
	513	if (!newsp)
	514	newsp = regs.regs[29];
219ac73a	515	parent_tidptr = (int __user *) regs.regs[6];
3c37026d RB	516
	517	/* Use __dummy4 instead of getting it off the stack, so that
	518	syscall() works. */
	519	child_tidptr = (int __user *) __dummy4;
	520	return do_fork(clone_flags, newsp, &regs, 0,
	521	parent_tidptr, child_tidptr);
	522	}