arch/mips/kernel/linux32.c - maze/linux - Git at Google

 /*
  * 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

 SYSCALL_DEFINE6(32_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;
 };

 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
 	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
 {
 	return sys_truncate(path, merge_64(a2, a3));
 }

 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
 	unsigned long, a2, unsigned long, a3)
 {
 	return sys_ftruncate(fd, merge_64(a2, a3));
 }

 SYSCALL_DEFINE5(32_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.  */

 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 	unsigned long, unused, unsigned long, a4, unsigned long, a5)
 {
 	return sys_pread64(fd, buf, count, merge_64(a4, a5));
 }

 SYSCALL_DEFINE6(32_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));
 }

 SYSCALL_DEFINE2(32_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

 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
 	unsigned long, ptr, unsigned long, 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

 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
 	u32, ptr, u32, fifth)
 {
 	return -ENOSYS;
 }

 #endif /* CONFIG_SYSVIPC */

 #ifdef CONFIG_MIPS32_N32
 SYSCALL_DEFINE4(n32_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);
 }

 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
 	int, msgflg)
 {
 	return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 }

 SYSCALL_DEFINE5(n32_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

 SYSCALL_DEFINE1(32_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;
 }

 SYSCALL_DEFINE1(32_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;
 }

 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, 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);
 }

 asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
 	size_t len)
 {
 	return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
 }
	/*
	* 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

	SYSCALL_DEFINE6(32_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;
	};

	SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
	{
	return sys_truncate(path, merge_64(a2, a3));
	}

	SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
	unsigned long, a2, unsigned long, a3)
	{
	return sys_ftruncate(fd, merge_64(a2, a3));
	}

	SYSCALL_DEFINE5(32_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. */

	SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
	unsigned long, unused, unsigned long, a4, unsigned long, a5)
	{
	return sys_pread64(fd, buf, count, merge_64(a4, a5));
	}

	SYSCALL_DEFINE6(32_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));
	}

	SYSCALL_DEFINE2(32_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

	SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
	unsigned long, ptr, unsigned long, 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

	SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
	u32, ptr, u32, fifth)
	{
	return -ENOSYS;
	}

	#endif /* CONFIG_SYSVIPC */

	#ifdef CONFIG_MIPS32_N32
	SYSCALL_DEFINE4(n32_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);
	}

	SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
	int, msgflg)
	{
	return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
	}

	SYSCALL_DEFINE5(n32_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

	SYSCALL_DEFINE1(32_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;
	}

	SYSCALL_DEFINE1(32_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;
	}

	SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, 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);
	}

	asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
	size_t len)
	{
	return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
	}