xref: /linux-2.4.37.9/arch/ia64/ia32/sys_ia32.c

/*
 * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Derived from sys_sparc32.c.
 *
 * Copyright (C) 2000		VA Linux Co
 * Copyright (C) 2000		Don Dugger <n0ano@valinux.com>
 * Copyright (C) 1999		Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 1997,1998	Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997		David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2000-2002 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sysctl.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/signal.h>
#include <linux/utime.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/timex.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/mm.h>
#include <linux/shm.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <linux/nfs_fs.h>
#include <linux/smb_fs.h>
#include <linux/smb_mount.h>
#include <linux/ncp_fs.h>
#include <linux/quota.h>
#include <linux/quotacompat.h>
#include <linux/module.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/ipc.h>

#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>

#include <net/scm.h>
#include <net/sock.h>
#include <asm/ia32.h>

#define DEBUG	0

#if DEBUG
# define DBG(fmt...)	printk(KERN_DEBUG fmt)
#else
# define DBG(fmt...)
#endif

#define A(__x)		((unsigned long)(__x))
#define AA(__x)		((unsigned long)(__x))
#define ROUND_UP(x,a)	((__typeof__(x))(((unsigned long)(x) + ((a) - 1)) & ~((a) - 1)))
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))

#define OFFSET4K(a)		((a) & 0xfff)
#define PAGE_START(addr)	((addr) & PAGE_MASK)
#define PAGE_OFF(addr)		((addr) & ~PAGE_MASK)
#define MINSIGSTKSZ_IA32	2048

extern asmlinkage long sys_execve (char *, char **, char **, struct pt_regs *);
extern asmlinkage long sys_mprotect (unsigned long, size_t, unsigned long);
extern asmlinkage long sys_munmap (unsigned long, size_t);
extern unsigned long arch_get_unmapped_area (struct file *, unsigned long, unsigned long,
					     unsigned long, unsigned long);

/* forward declaration: */
asmlinkage long sys32_mprotect (unsigned int, unsigned int, int);
asmlinkage unsigned long sys_brk(unsigned long);

/*
 * Anything that modifies or inspects ia32 user virtual memory must hold this semaphore
 * while doing so.
 */
/* XXX make per-mm: */
static DECLARE_MUTEX(ia32_mmap_sem);

static int
nargs (unsigned int arg, char **ap, int max)
{
	unsigned int addr;
	int n, err;

	if (!arg)
		return 0;

	n = 0;
	do {
		err = get_user(addr, (unsigned int *)A(arg));
		if (err)
			return err;
		if (n > max)
			return -E2BIG;
		if (ap)
			*ap++ = (char *) A(addr);
		arg += sizeof(unsigned int);
		n++;
		if (n >= (MAX_ARG_PAGES * PAGE_SIZE) / sizeof(char *))
			return -E2BIG;
	} while (addr);
	return n - 1;
}

asmlinkage long
sys32_execve (char *filename, unsigned int argv, unsigned int envp,
	      int dummy3, int dummy4, int dummy5, int dummy6, int dummy7,
	      int stack)
{
	struct pt_regs *regs = (struct pt_regs *)&stack;
	unsigned long old_map_base, old_task_size, tssd;
	char **av, **ae;
	int na, ne, len;
	long r;

	/* Allocates upto 2x MAX_ARG_PAGES */
	na = nargs(argv, NULL, (MAX_ARG_PAGES*PAGE_SIZE) / sizeof(char *) - 1);
	if (na < 0)
		return na;
	ne = nargs(envp, NULL, (MAX_ARG_PAGES*PAGE_SIZE) / sizeof(char *) - 1 );
	if (ne < 0)
		return ne;
	len = (na + ne + 2) * sizeof(*av);
	av = kmalloc(len, GFP_KERNEL);
	if (!av)
		return -ENOMEM;

	ae = av + na + 1;
	av[na] = NULL;
	ae[ne] = NULL;

	r = nargs(argv, av, na);
	if (r < 0)
		goto out;
	r = nargs(envp, ae, ne);
	if (r < 0)
		goto out;

	old_map_base  = current->thread.map_base;
	old_task_size = current->thread.task_size;
	tssd = ia64_get_kr(IA64_KR_TSSD);

	/* we may be exec'ing a 64-bit process: reset map base, task-size, and io-base: */
	current->thread.map_base  = DEFAULT_MAP_BASE;
	current->thread.task_size = DEFAULT_TASK_SIZE;
	ia64_set_kr(IA64_KR_IO_BASE, current->thread.old_iob);
	ia64_set_kr(IA64_KR_TSSD, current->thread.old_k1);

	set_fs(KERNEL_DS);
	r = sys_execve(filename, av, ae, regs);
	if (r < 0) {
		/* oops, execve failed, switch back to old values... */
		ia64_set_kr(IA64_KR_IO_BASE, IA32_IOBASE);
		ia64_set_kr(IA64_KR_TSSD, tssd);
		current->thread.map_base  = old_map_base;
		current->thread.task_size = old_task_size;
		set_fs(USER_DS);	/* establish new task-size as the address-limit */
	}
  out:
	kfree(av);
	return r;
}

static inline int
putstat (struct stat32 *ubuf, struct stat *kbuf)
{
	int err;

	if (clear_user(ubuf, sizeof(*ubuf)))
		return 1;

	err  = __put_user(kbuf->st_dev, &ubuf->st_dev);
	err |= __put_user(kbuf->st_ino, &ubuf->st_ino);
	err |= __put_user(kbuf->st_mode, &ubuf->st_mode);
	err |= __put_user(kbuf->st_nlink, &ubuf->st_nlink);
	err |= __put_user(kbuf->st_uid, &ubuf->st_uid);
	err |= __put_user(kbuf->st_gid, &ubuf->st_gid);
	err |= __put_user(kbuf->st_rdev, &ubuf->st_rdev);
	err |= __put_user(kbuf->st_size, &ubuf->st_size);
	err |= __put_user(kbuf->st_atime, &ubuf->st_atime);
	err |= __put_user(kbuf->st_mtime, &ubuf->st_mtime);
	err |= __put_user(kbuf->st_ctime, &ubuf->st_ctime);
	err |= __put_user(kbuf->st_blksize, &ubuf->st_blksize);
	err |= __put_user(kbuf->st_blocks, &ubuf->st_blocks);
	return err;
}

extern asmlinkage long sys_newstat (char * filename, struct stat * statbuf);

asmlinkage long
sys32_newstat (char *filename, struct stat32 *statbuf)
{
	char *name;
	int ret;
	struct stat s;
	mm_segment_t old_fs = get_fs();

	name = getname(filename);
	if (IS_ERR(name))
		return PTR_ERR(name);
	set_fs(KERNEL_DS);
	ret = sys_newstat(name, &s);
	set_fs(old_fs);
	putname(name);
	if (putstat(statbuf, &s))
		return -EFAULT;
	return ret;
}

extern asmlinkage long sys_newlstat(char * filename, struct stat * statbuf);

asmlinkage long
sys32_newlstat (char *filename, struct stat32 *statbuf)
{
	char *name;
	mm_segment_t old_fs = get_fs();
	struct stat s;
	int ret;

	name = getname(filename);
	if (IS_ERR(name))
		return PTR_ERR(name);
	set_fs(KERNEL_DS);
	ret = sys_newlstat(name, &s);
	set_fs(old_fs);
	putname(name);
	if (putstat(statbuf, &s))
		return -EFAULT;
	return ret;
}

extern asmlinkage long sys_newfstat(unsigned int fd, struct stat * statbuf);

asmlinkage long
sys32_newfstat (unsigned int fd, struct stat32 *statbuf)
{
	mm_segment_t old_fs = get_fs();
	struct stat s;
	int ret;

	set_fs(KERNEL_DS);
	ret = sys_newfstat(fd, &s);
	set_fs(old_fs);
	if (putstat(statbuf, &s))
		return -EFAULT;
	return ret;
}

#if PAGE_SHIFT > IA32_PAGE_SHIFT


static int
get_page_prot (struct vm_area_struct *vma, unsigned long addr)
{
	int prot = 0;

	if (!vma || vma->vm_start > addr)
		return 0;

	if (vma->vm_flags & VM_READ)
		prot |= PROT_READ;
	if (vma->vm_flags & VM_WRITE)
		prot |= PROT_WRITE;
	if (vma->vm_flags & VM_EXEC)
		prot |= PROT_EXEC;
	return prot;
}

/*
 * Map a subpage by creating an anonymous page that contains the union of the old page and
 * the subpage.
 */
static unsigned long
mmap_subpage (struct file *file, unsigned long start, unsigned long end, int prot, int flags,
	      loff_t off)
{
	void *page = NULL;
	struct inode *inode;
	unsigned long ret = 0;
	struct vm_area_struct *vma = find_vma(current->mm, start);
	int old_prot = get_page_prot(vma, start);

	DBG("mmap_subpage(file=%p,start=0x%lx,end=0x%lx,prot=%x,flags=%x,off=0x%llx)\n",
	    file, start, end, prot, flags, off);


	/* Optimize the case where the old mmap and the new mmap are both anonymous */
	if ((old_prot & PROT_WRITE) && (flags & MAP_ANONYMOUS) && !vma->vm_file) {
		if (clear_user((void *) start, end - start)) {
			ret = -EFAULT;
			goto out;
		}
		goto skip_mmap;
	}

	page = (void *) get_zeroed_page(GFP_KERNEL);
	if (!page)
		return -ENOMEM;

	if (old_prot)
		copy_from_user(page, (void *) PAGE_START(start), PAGE_SIZE);

	down_write(&current->mm->mmap_sem);
	{
		ret = do_mmap(0, PAGE_START(start), PAGE_SIZE, prot | PROT_WRITE,
			      flags | MAP_FIXED | MAP_ANONYMOUS, 0);
	}
	up_write(&current->mm->mmap_sem);

	if (IS_ERR((void *) ret))
		goto out;

	if (old_prot) {
		/* copy back the old page contents.  */
		if (PAGE_OFF(start))
			copy_to_user((void *) PAGE_START(start), page, PAGE_OFF(start));
		if (PAGE_OFF(end))
			copy_to_user((void *) end, page + PAGE_OFF(end),
				     PAGE_SIZE - PAGE_OFF(end));
	}

	if (!(flags & MAP_ANONYMOUS)) {
		/* read the file contents */
		inode = file->f_dentry->d_inode;
		if (!inode->i_fop || !file->f_op->read
		    || ((*file->f_op->read)(file, (char *) start, end - start, &off) < 0))
		{
			ret = -EINVAL;
			goto out;
		}
	}

 skip_mmap:
	if (!(prot & PROT_WRITE))
		ret = sys_mprotect(PAGE_START(start), PAGE_SIZE, prot | old_prot);
  out:
	if (page)
		free_page((unsigned long) page);
	return ret;
}

static unsigned long
emulate_mmap (struct file *file, unsigned long start, unsigned long len, int prot, int flags,
	      loff_t off)
{
	unsigned long tmp, end, pend, pstart, ret, is_congruent, fudge = 0;
	struct inode *inode;
	loff_t poff;

	end = start + len;
	pstart = PAGE_START(start);
	pend = PAGE_ALIGN(end);

	if (flags & MAP_FIXED) {
		if (start > pstart) {
			if (flags & MAP_SHARED)
				printk(KERN_INFO
				       "%s(%d): emulate_mmap() can't share head (addr=0x%lx)\n",
				       current->comm, current->pid, start);
			ret = mmap_subpage(file, start, min(PAGE_ALIGN(start), end), prot, flags,
					   off);
			if (IS_ERR((void *) ret))
				return ret;
			pstart += PAGE_SIZE;
			if (pstart >= pend)
				return start;	/* done */
		}
		if (end < pend) {
			if (flags & MAP_SHARED)
				printk(KERN_INFO
				       "%s(%d): emulate_mmap() can't share tail (end=0x%lx)\n",
				       current->comm, current->pid, end);
			ret = mmap_subpage(file, max(start, PAGE_START(end)), end, prot, flags,
					   (off + len) - PAGE_OFF(end));
			if (IS_ERR((void *) ret))
				return ret;
			pend -= PAGE_SIZE;
			if (pstart >= pend)
				return start;	/* done */
		}
	} else {
		/*
		 * If a start address was specified, use it if the entire rounded out area
		 * is available.
		 */
		if (start && !pstart)
			fudge = 1;	/* handle case of mapping to range (0,PAGE_SIZE) */
		tmp = arch_get_unmapped_area(file, pstart - fudge, pend - pstart, 0, flags);
		if (tmp != pstart) {
			pstart = tmp;
			start = pstart + PAGE_OFF(off);	/* make start congruent with off */
			end = start + len;
			pend = PAGE_ALIGN(end);
		}
	}

	poff = off + (pstart - start);	/* note: (pstart - start) may be negative */
	is_congruent = (flags & MAP_ANONYMOUS) || (PAGE_OFF(poff) == 0);

	if ((flags & MAP_SHARED) && !is_congruent)
		printk(KERN_INFO "%s(%d): emulate_mmap() can't share contents of incongruent mmap "
		       "(addr=0x%lx,off=0x%llx)\n", current->comm, current->pid, start, off);

	DBG("mmap_body: mapping [0x%lx-0x%lx) %s with poff 0x%llx\n", pstart, pend,
	    is_congruent ? "congruent" : "not congruent", poff);

	down_write(&current->mm->mmap_sem);
	{
		if (!(flags & MAP_ANONYMOUS) && is_congruent)
			ret = do_mmap(file, pstart, pend - pstart, prot, flags | MAP_FIXED, poff);
		else
			ret = do_mmap(0, pstart, pend - pstart,
				      prot | ((flags & MAP_ANONYMOUS) ? 0 : PROT_WRITE),
				      flags | MAP_FIXED | MAP_ANONYMOUS, 0);
	}
	up_write(&current->mm->mmap_sem);

	if (IS_ERR((void *) ret))
		return ret;

	if (!is_congruent) {
		/* read the file contents */
		inode = file->f_dentry->d_inode;
		if (!inode->i_fop || !file->f_op->read
		    || ((*file->f_op->read)(file, (char *) pstart, pend - pstart, &poff) < 0))
		{
			sys_munmap(pstart, pend - pstart);
			return -EINVAL;
		}
		if (!(prot & PROT_WRITE) && sys_mprotect(pstart, pend - pstart, prot) < 0)
			return -EINVAL;
	}
	return start;
}

#endif /* PAGE_SHIFT > IA32_PAGE_SHIFT */

static inline unsigned int
get_prot32 (unsigned int prot)
{
	if (prot & PROT_WRITE)
		/* on x86, PROT_WRITE implies PROT_READ which implies PROT_EEC */
		prot |= PROT_READ | PROT_WRITE | PROT_EXEC;
	else if (prot & (PROT_READ | PROT_EXEC))
		/* on x86, there is no distinction between PROT_READ and PROT_EXEC */
		prot |= (PROT_READ | PROT_EXEC);

	return prot;
}

unsigned long
ia32_do_mmap (struct file *file, unsigned long addr, unsigned long len, int prot, int flags,
	      loff_t offset)
{
	DBG("ia32_do_mmap(file=%p,addr=0x%lx,len=0x%lx,prot=%x,flags=%x,offset=0x%llx)\n",
	    file, addr, len, prot, flags, offset);

	if (file && (!file->f_op || !file->f_op->mmap))
		return -ENODEV;

	len = IA32_PAGE_ALIGN(len);
	if (len == 0)
		return addr;

	if (len > IA32_PAGE_OFFSET || addr > IA32_PAGE_OFFSET - len)
	{
		if (flags & MAP_FIXED)
			return -ENOMEM;
		else
		return -EINVAL;
	}

	if (OFFSET4K(offset))
		return -EINVAL;

	prot = get_prot32(prot);

#if PAGE_SHIFT > IA32_PAGE_SHIFT
	down(&ia32_mmap_sem);
	{
		addr = emulate_mmap(file, addr, len, prot, flags, offset);
	}
	up(&ia32_mmap_sem);
#else
	down_write(&current->mm->mmap_sem);
	{
		addr = do_mmap(file, addr, len, prot, flags, offset);
	}
	up_write(&current->mm->mmap_sem);
#endif
	DBG("ia32_do_mmap: returning 0x%lx\n", addr);
	return addr;
}

/*
 * Linux/i386 didn't use to be able to handle more than 4 system call parameters, so these
 * system calls used a memory block for parameter passing..
 */

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

asmlinkage long
sys32_mmap (struct mmap_arg_struct *arg)
{
	struct mmap_arg_struct a;
	struct file *file = NULL;
	unsigned long addr;
	int flags;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;

	if (OFFSET4K(a.offset))
		return -EINVAL;

	flags = a.flags;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(a.fd);
		if (!file)
			return -EBADF;
	}

	addr = ia32_do_mmap(file, a.addr, a.len, a.prot, flags, a.offset);

	if (file)
		fput(file);
	return addr;
}

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

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

	retval = ia32_do_mmap(file, addr, len, prot, flags,
			      (unsigned long) pgoff << IA32_PAGE_SHIFT);

	if (file)
		fput(file);
	return retval;
}

asmlinkage long
sys32_munmap (unsigned int start, unsigned int len)
{
	unsigned int end = start + len;
	long ret;

#if PAGE_SHIFT <= IA32_PAGE_SHIFT
	ret = sys_munmap(start, end - start);
#else
	if (start >= end)
		return -EINVAL;

	start = PAGE_ALIGN(start);
	end = PAGE_START(end);

	if (start >= end)
		return 0;

	down(&ia32_mmap_sem);
	{
		ret = sys_munmap(start, end - start);
	}
	up(&ia32_mmap_sem);
#endif
	return ret;
}

#if PAGE_SHIFT > IA32_PAGE_SHIFT

/*
 * When mprotect()ing a partial page, we set the permission to the union of the old
 * settings and the new settings.  In other words, it's only possible to make access to a
 * partial page less restrictive.
 */
static long
mprotect_subpage (unsigned long address, int new_prot)
{
	int old_prot;
	struct vm_area_struct *vma;

	if (new_prot == PROT_NONE)
		return 0;		/* optimize case where nothing changes... */
	vma = find_vma(current->mm, address);
	old_prot = get_page_prot(vma, address);
	return sys_mprotect(address, PAGE_SIZE, new_prot | old_prot);
}

#endif /* PAGE_SHIFT > IA32_PAGE_SHIFT */

asmlinkage long
sys32_mprotect (unsigned int start, unsigned int len, int prot)
{
	unsigned long end = start + len;
#if PAGE_SHIFT > IA32_PAGE_SHIFT
	long retval = 0;
#endif

	prot = get_prot32(prot);

#if PAGE_SHIFT <= IA32_PAGE_SHIFT
	return sys_mprotect(start, end - start, prot);
#else
	if (OFFSET4K(start))
		return -EINVAL;

	end = IA32_PAGE_ALIGN(end);
	if (end < start)
		return -EINVAL;

	down(&ia32_mmap_sem);
	{
		if (PAGE_OFF(start)) {
			/* start address is 4KB aligned but not page aligned. */
			retval = mprotect_subpage(PAGE_START(start), prot);
			if (retval < 0)
				goto out;

			start = PAGE_ALIGN(start);
			if (start >= end)
				goto out;	/* retval is already zero... */
		}

		if (PAGE_OFF(end)) {
			/* end address is 4KB aligned but not page aligned. */
			retval = mprotect_subpage(PAGE_START(end), prot);
			if (retval < 0)
				goto out;

			end = PAGE_START(end);
		}
		retval = sys_mprotect(start, end - start, prot);
	}
  out:
	up(&ia32_mmap_sem);
	return retval;
#endif
}

asmlinkage long
sys32_pipe (int *fd)
{
	int retval;
	int fds[2];

	retval = do_pipe(fds);
	if (retval)
		goto out;
	if (copy_to_user(fd, fds, sizeof(fds)))
		retval = -EFAULT;
  out:
	return retval;
}

static inline int
put_statfs (struct statfs32 *ubuf, struct statfs *kbuf)
{
	int err;

	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
		return -EFAULT;

	err = __put_user(kbuf->f_type, &ubuf->f_type);
	err |= __put_user(kbuf->f_bsize, &ubuf->f_bsize);
	err |= __put_user(kbuf->f_blocks, &ubuf->f_blocks);
	err |= __put_user(kbuf->f_bfree, &ubuf->f_bfree);
	err |= __put_user(kbuf->f_bavail, &ubuf->f_bavail);
	err |= __put_user(kbuf->f_files, &ubuf->f_files);
	err |= __put_user(kbuf->f_ffree, &ubuf->f_ffree);
	err |= __put_user(kbuf->f_namelen, &ubuf->f_namelen);
	err |= __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]);
	err |= __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]);
	return err;
}

extern asmlinkage long sys_statfs(const char * path, struct statfs * buf);

asmlinkage long
sys32_statfs (const char *path, struct statfs32 *buf)
{
	const char *name;
	int ret;
	struct statfs s;
	mm_segment_t old_fs = get_fs();

	name = getname(path);
	if (IS_ERR(name))
		return PTR_ERR(name);
	set_fs(KERNEL_DS);
	ret = sys_statfs(name, &s);
	set_fs(old_fs);
	putname(name);
	if (put_statfs(buf, &s))
		return -EFAULT;
	return ret;
}

extern asmlinkage long sys_fstatfs(unsigned int fd, struct statfs * buf);

asmlinkage long
sys32_fstatfs (unsigned int fd, struct statfs32 *buf)
{
	int ret;
	struct statfs s;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_fstatfs(fd, &s);
	set_fs(old_fs);
	if (put_statfs(buf, &s))
		return -EFAULT;
	return ret;
}

struct timeval32
{
    int tv_sec, tv_usec;
};

struct itimerval32
{
    struct timeval32 it_interval;
    struct timeval32 it_value;
};

static inline long
get_tv32 (struct timeval *o, struct timeval32 *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 timeval32 *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)));
}

static inline long
get_it32 (struct itimerval *o, struct itimerval32 *i)
{
	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
}

static inline long
put_it32 (struct itimerval32 *o, struct itimerval *i)
{
	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
}

extern int do_getitimer (int which, struct itimerval *value);

asmlinkage long
sys32_getitimer (int which, struct itimerval32 *it)
{
	struct itimerval kit;
	int error;

	error = do_getitimer(which, &kit);
	if (!error && put_it32(it, &kit))
		error = -EFAULT;

	return error;
}

extern int do_setitimer (int which, struct itimerval *, struct itimerval *);

asmlinkage long
sys32_setitimer (int which, struct itimerval32 *in, struct itimerval32 *out)
{
	struct itimerval kin, kout;
	int error;

	if (in) {
		if (get_it32(&kin, in))
			return -EFAULT;
	} else
		memset(&kin, 0, sizeof(kin));

	error = do_setitimer(which, &kin, out ? &kout : NULL);
	if (error || !out)
		return error;
	if (put_it32(out, &kout))
		return -EFAULT;

	return 0;

}

asmlinkage unsigned long
sys32_alarm (unsigned int seconds)
{
	struct itimerval it_new, it_old;
	unsigned int oldalarm;

	it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
	it_new.it_value.tv_sec = seconds;
	it_new.it_value.tv_usec = 0;
	do_setitimer(ITIMER_REAL, &it_new, &it_old);
	oldalarm = it_old.it_value.tv_sec;
	/* ehhh.. We can't return 0 if we have an alarm pending.. */
	/* And we'd better return too much than too little anyway */
	if (it_old.it_value.tv_usec)
		oldalarm++;
	return oldalarm;
}

/* Translations due to time_t size differences.  Which affects all
   sorts of things, like timeval and itimerval.  */

struct utimbuf_32 {
	int	atime;
	int	mtime;
};

extern asmlinkage long sys_utimes(char * filename, struct timeval * utimes);
extern asmlinkage long sys_gettimeofday (struct timeval *tv, struct timezone *tz);

asmlinkage long
sys32_utime (char *filename, struct utimbuf_32 *times32)
{
	mm_segment_t old_fs = get_fs();
	struct timeval tv[2], *tvp;
	long ret;

	if (times32) {
		if (get_user(tv[0].tv_sec, &times32->atime))
			return -EFAULT;
		tv[0].tv_usec = 0;
		if (get_user(tv[1].tv_sec, &times32->mtime))
			return -EFAULT;
		tv[1].tv_usec = 0;
		set_fs(KERNEL_DS);
		tvp = tv;
	} else
		tvp = NULL;
	ret = sys_utimes(filename, tvp);
	set_fs(old_fs);
	return ret;
}

extern struct timezone sys_tz;
extern int do_sys_settimeofday (struct timeval *tv, struct timezone *tz);

asmlinkage long
sys32_gettimeofday (struct timeval32 *tv, struct timezone *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;
}

asmlinkage long
sys32_settimeofday (struct timeval32 *tv, struct timezone *tz)
{
	struct timeval ktv;
	struct timezone ktz;

	if (tv) {
		if (get_tv32(&ktv, tv))
			return -EFAULT;
	}
	if (tz) {
		if (copy_from_user(&ktz, tz, sizeof(ktz)))
			return -EFAULT;
	}

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

struct getdents32_callback {
	struct linux32_dirent * current_dir;
	struct linux32_dirent * previous;
	int count;
	int error;
};

struct readdir32_callback {
	struct old_linux32_dirent * dirent;
	int count;
};

static int
filldir32 (void *__buf, const char *name, int namlen, loff_t offset, ino_t ino,
	   unsigned int d_type)
{
	struct linux32_dirent * dirent;
	struct getdents32_callback * buf = (struct getdents32_callback *) __buf;
	int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1, 4);

	buf->error = -EINVAL;	/* only used if we fail.. */
	if (reclen > buf->count)
		return -EINVAL;
	buf->error = -EFAULT;	/* only used if we fail.. */
	dirent = buf->previous;
	if (dirent)
		if (put_user(offset, &dirent->d_off))
			return -EFAULT;
	dirent = buf->current_dir;
	buf->previous = dirent;
	if (put_user(ino, &dirent->d_ino)
	    || put_user(reclen, &dirent->d_reclen)
	    || copy_to_user(dirent->d_name, name, namlen)
	    || put_user(0, dirent->d_name + namlen))
		return -EFAULT;
	((char *) dirent) += reclen;
	buf->current_dir = dirent;
	buf->count -= reclen;
	return 0;
}

asmlinkage long
sys32_getdents (unsigned int fd, struct linux32_dirent *dirent, unsigned int count)
{
	struct file * file;
	struct linux32_dirent * lastdirent;
	struct getdents32_callback buf;
	int error;

	error = -EBADF;
	file = fget(fd);
	if (!file)
		goto out;

	buf.current_dir = dirent;
	buf.previous = NULL;
	buf.count = count;
	buf.error = 0;

	error = vfs_readdir(file, filldir32, &buf);
	if (error < 0)
		goto out_putf;
	error = buf.error;
	lastdirent = buf.previous;
	if (lastdirent) {
		error = -EINVAL;
		if (put_user(file->f_pos, &lastdirent->d_off))
			goto out_putf;
		error = count - buf.count;
	}

out_putf:
	fput(file);
out:
	return error;
}

static int
fillonedir32 (void * __buf, const char * name, int namlen, loff_t offset, ino_t ino,
	      unsigned int d_type)
{
	struct readdir32_callback * buf = (struct readdir32_callback *) __buf;
	struct old_linux32_dirent * dirent;

	if (buf->count)
		return -EINVAL;
	buf->count++;
	dirent = buf->dirent;
	if (put_user(ino, &dirent->d_ino)
	    || put_user(offset, &dirent->d_offset)
	    || put_user(namlen, &dirent->d_namlen)
	    || copy_to_user(dirent->d_name, name, namlen)
	    || put_user(0, dirent->d_name + namlen))
		return -EFAULT;
	return 0;
}

asmlinkage long
sys32_readdir (unsigned int fd, void *dirent, unsigned int count)
{
	int error;
	struct file * file;
	struct readdir32_callback buf;

	error = -EBADF;
	file = fget(fd);
	if (!file)
		goto out;

	buf.count = 0;
	buf.dirent = dirent;

	error = vfs_readdir(file, fillonedir32, &buf);
	if (error >= 0)
		error = buf.count;
	fput(file);
out:
	return error;
}

/*
 * We can actually return ERESTARTSYS instead of EINTR, but I'd
 * like to be certain this leads to no problems. So I return
 * EINTR just for safety.
 *
 * Update: ERESTARTSYS breaks at least the xview clock binary, so
 * I'm trying ERESTARTNOHAND which restart only when you want to.
 */
#define MAX_SELECT_SECONDS \
	((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
#define ROUND_UP_TIME(x,y) (((x)+(y)-1)/(y))

asmlinkage long
sys32_select (int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval32 *tvp32)
{
	fd_set_bits fds;
	char *bits;
	long timeout;
	int ret, size;

	timeout = MAX_SCHEDULE_TIMEOUT;
	if (tvp32) {
		time_t sec, usec;

		ret = -EFAULT;
		if (get_user(sec, &tvp32->tv_sec) || get_user(usec, &tvp32->tv_usec))
			goto out_nofds;

		ret = -EINVAL;
		if (sec < 0 || usec < 0)
			goto out_nofds;

		if ((unsigned long) sec < MAX_SELECT_SECONDS) {
			timeout = ROUND_UP_TIME(usec, 1000000/HZ);
			timeout += sec * (unsigned long) HZ;
		}
	}

	ret = -EINVAL;
	if (n < 0)
		goto out_nofds;

	if (n > current->files->max_fdset)
		n = current->files->max_fdset;

	/*
	 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
	 * since we used fdset we need to allocate memory in units of
	 * long-words.
	 */
	ret = -ENOMEM;
	size = FDS_BYTES(n);
	bits = kmalloc(6 * size, GFP_KERNEL);
	if (!bits)
		goto out_nofds;
	fds.in      = (unsigned long *)  bits;
	fds.out     = (unsigned long *) (bits +   size);
	fds.ex      = (unsigned long *) (bits + 2*size);
	fds.res_in  = (unsigned long *) (bits + 3*size);
	fds.res_out = (unsigned long *) (bits + 4*size);
	fds.res_ex  = (unsigned long *) (bits + 5*size);

	if ((ret = get_fd_set(n, inp, fds.in)) ||
	    (ret = get_fd_set(n, outp, fds.out)) ||
	    (ret = get_fd_set(n, exp, fds.ex)))
		goto out;
	zero_fd_set(n, fds.res_in);
	zero_fd_set(n, fds.res_out);
	zero_fd_set(n, fds.res_ex);

	ret = do_select(n, &fds, &timeout);

	if (tvp32 && !(current->personality & STICKY_TIMEOUTS)) {
		time_t sec = 0, usec = 0;
		if (timeout) {
			sec = timeout / HZ;
			usec = timeout % HZ;
			usec *= (1000000/HZ);
		}
		if (put_user(sec, &tvp32->tv_sec) || put_user(usec, &tvp32->tv_usec)) {
			ret = -EFAULT;
			goto out;
		}
	}

	if (ret < 0)
		goto out;
	if (!ret) {
		ret = -ERESTARTNOHAND;
		if (signal_pending(current))
			goto out;
		ret = 0;
	}

	set_fd_set(n, inp, fds.res_in);
	set_fd_set(n, outp, fds.res_out);
	set_fd_set(n, exp, fds.res_ex);

out:
	kfree(bits);
out_nofds:
	return ret;
}

struct sel_arg_struct {
	unsigned int n;
	unsigned int inp;
	unsigned int outp;
	unsigned int exp;
	unsigned int tvp;
};

asmlinkage long
sys32_old_select (struct sel_arg_struct *arg)
{
	struct sel_arg_struct a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	return sys32_select(a.n, (fd_set *) A(a.inp), (fd_set *) A(a.outp), (fd_set *) A(a.exp),
			    (struct timeval32 *) A(a.tvp));
}

extern asmlinkage long sys_nanosleep (struct timespec *rqtp, struct timespec *rmtp);

asmlinkage long
sys32_nanosleep (struct timespec32 *rqtp, struct timespec32 *rmtp)
{
	struct timespec t;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (get_user (t.tv_sec, &rqtp->tv_sec) || get_user (t.tv_nsec, &rqtp->tv_nsec))
		return -EFAULT;
	set_fs(KERNEL_DS);
	ret = sys_nanosleep(&t, rmtp ? &t : NULL);
	set_fs(old_fs);
	if (rmtp && ret == -EINTR) {
		if (put_user(t.tv_sec, &rmtp->tv_sec) || put_user(t.tv_nsec, &rmtp->tv_nsec))
			return -EFAULT;
	}
	return ret;
}

struct iovec32 { unsigned int iov_base; int iov_len; };
asmlinkage ssize_t sys_readv (unsigned long,const struct iovec *,unsigned long);
asmlinkage ssize_t sys_writev (unsigned long,const struct iovec *,unsigned long);

static struct iovec *
get_iovec32 (struct iovec32 *iov32, struct iovec *iov_buf, u32 count, int type)
{
	int i;
	u32 buf, len;
	struct iovec *ivp, *iov;

	/* Get the "struct iovec" from user memory */

	if (!count)
		return 0;
	if (verify_area(VERIFY_READ, iov32, sizeof(struct iovec32)*count))
		return NULL;
	if (count > UIO_MAXIOV)
		return NULL;
	if (count > UIO_FASTIOV) {
		iov = kmalloc(count*sizeof(struct iovec), GFP_KERNEL);
		if (!iov)
			return NULL;
	} else
		iov = iov_buf;

	ivp = iov;
	for (i = 0; i < count; i++) {
		if (__get_user(len, &iov32->iov_len) || __get_user(buf, &iov32->iov_base)) {
			if (iov != iov_buf)
				kfree(iov);
			return NULL;
		}
		if (verify_area(type, (void *)A(buf), len)) {
			if (iov != iov_buf)
				kfree(iov);
			return((struct iovec *)0);
		}
		ivp->iov_base = (void *)A(buf);
		ivp->iov_len = (__kernel_size_t) len;
		iov32++;
		ivp++;
	}
	return iov;
}

asmlinkage long
sys32_readv (int fd, struct iovec32 *vector, u32 count)
{
	struct iovec iovstack[UIO_FASTIOV];
	struct iovec *iov;
	long ret;
	mm_segment_t old_fs = get_fs();

	iov = get_iovec32(vector, iovstack, count, VERIFY_WRITE);
	if (!iov)
		return -EFAULT;
	set_fs(KERNEL_DS);
	ret = sys_readv(fd, iov, count);
	set_fs(old_fs);
	if (iov != iovstack)
		kfree(iov);
	return ret;
}

asmlinkage long
sys32_writev (int fd, struct iovec32 *vector, u32 count)
{
	struct iovec iovstack[UIO_FASTIOV];
	struct iovec *iov;
	long ret;
	mm_segment_t old_fs = get_fs();

	iov = get_iovec32(vector, iovstack, count, VERIFY_READ);
	if (!iov)
		return -EFAULT;
	set_fs(KERNEL_DS);
	ret = sys_writev(fd, iov, count);
	set_fs(old_fs);
	if (iov != iovstack)
		kfree(iov);
	return ret;
}

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

struct rlimit32 {
	unsigned int	rlim_cur;
	unsigned int	rlim_max;
};

extern asmlinkage long sys_getrlimit (unsigned int resource, struct rlimit *rlim);

asmlinkage long
sys32_old_getrlimit (unsigned int resource, struct rlimit32 *rlim)
{
	mm_segment_t old_fs = get_fs();
	struct rlimit r;
	int ret;

	set_fs(KERNEL_DS);
	ret = sys_getrlimit(resource, &r);
	set_fs(old_fs);
	if (!ret) {
		ret = put_user(RESOURCE32(r.rlim_cur), &rlim->rlim_cur);
		ret |= put_user(RESOURCE32(r.rlim_max), &rlim->rlim_max);
	}
	return ret;
}

asmlinkage long
sys32_getrlimit (unsigned int resource, struct rlimit32 *rlim)
{
	mm_segment_t old_fs = get_fs();
	struct rlimit r;
	int ret;

	set_fs(KERNEL_DS);
	ret = sys_getrlimit(resource, &r);
	set_fs(old_fs);
	if (!ret) {
		if (r.rlim_cur >= 0xffffffff)
			r.rlim_cur = 0xffffffff;
		if (r.rlim_max >= 0xffffffff)
			r.rlim_max = 0xffffffff;
		ret = put_user(r.rlim_cur, &rlim->rlim_cur);
		ret |= put_user(r.rlim_max, &rlim->rlim_max);
	}
	return ret;
}

extern asmlinkage long sys_setrlimit (unsigned int resource, struct rlimit *rlim);

asmlinkage long
sys32_setrlimit (unsigned int resource, struct rlimit32 *rlim)
{
	struct rlimit r;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (resource >= RLIM_NLIMITS)
		return -EINVAL;
	if (get_user(r.rlim_cur, &rlim->rlim_cur) || get_user(r.rlim_max, &rlim->rlim_max))
		return -EFAULT;
	if (r.rlim_cur == RLIM_INFINITY32)
		r.rlim_cur = RLIM_INFINITY;
	if (r.rlim_max == RLIM_INFINITY32)
		r.rlim_max = RLIM_INFINITY;
	set_fs(KERNEL_DS);
	ret = sys_setrlimit(resource, &r);
	set_fs(old_fs);
	return ret;
}

/*
 *  Declare the IA32 version of the msghdr
 */

struct msghdr32 {
	unsigned int    msg_name;	/* Socket name			*/
	int		msg_namelen;	/* Length of name		*/
	unsigned int    msg_iov;	/* Data blocks			*/
	unsigned int	msg_iovlen;	/* Number of blocks		*/
	unsigned int    msg_control;	/* Per protocol magic (eg BSD file descriptor passing) */
	unsigned int	msg_controllen;	/* Length of cmsg list */
	unsigned	msg_flags;
};

struct cmsghdr32 {
	__kernel_size_t32 cmsg_len;
	int               cmsg_level;
	int               cmsg_type;
};

/* Bleech... */
#define __CMSG32_NXTHDR(ctl, len, cmsg, cmsglen) __cmsg32_nxthdr((ctl),(len),(cmsg),(cmsglen))
#define CMSG32_NXTHDR(mhdr, cmsg, cmsglen)	cmsg32_nxthdr((mhdr), (cmsg), (cmsglen))
#define CMSG32_ALIGN(len) ( ((len)+sizeof(int)-1) & ~(sizeof(int)-1) )
#define CMSG32_DATA(cmsg) \
	((void *)((char *)(cmsg) + CMSG32_ALIGN(sizeof(struct cmsghdr32))))
#define CMSG32_SPACE(len) \
	(CMSG32_ALIGN(sizeof(struct cmsghdr32)) + CMSG32_ALIGN(len))
#define CMSG32_LEN(len) (CMSG32_ALIGN(sizeof(struct cmsghdr32)) + (len))
#define __CMSG32_FIRSTHDR(ctl,len) \
	((len) >= sizeof(struct cmsghdr32) ? (struct cmsghdr32 *)(ctl) : (struct cmsghdr32 *)NULL)
#define CMSG32_FIRSTHDR(msg)	__CMSG32_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
#define CMSG32_OK(ucmlen, ucmsg, mhdr) \
	((ucmlen) >= sizeof(struct cmsghdr32) && \
	 (ucmlen) <= (unsigned long) \
	 ((mhdr)->msg_controllen - \
	  ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))

static inline struct cmsghdr32 *
__cmsg32_nxthdr (void *ctl, __kernel_size_t size, struct cmsghdr32 *cmsg, int cmsg_len)
{
	struct cmsghdr32 * ptr;

	ptr = (struct cmsghdr32 *)(((unsigned char *) cmsg) + CMSG32_ALIGN(cmsg_len));
	if ((unsigned long)((char*)(ptr+1) - (char *) ctl) > size)
		return NULL;
	return ptr;
}

static inline struct cmsghdr32 *
cmsg32_nxthdr (struct msghdr *msg, struct cmsghdr32 *cmsg, int cmsg_len)
{
	return __cmsg32_nxthdr(msg->msg_control, msg->msg_controllen, cmsg, cmsg_len);
}

static inline int
get_msghdr32 (struct msghdr *mp, struct msghdr32 *mp32)
{
	int ret;
	unsigned int i;

	if (!access_ok(VERIFY_READ, mp32, sizeof(*mp32)))
		return -EFAULT;
	ret = __get_user(i, &mp32->msg_name);
	mp->msg_name = (void *)A(i);
	ret |= __get_user(mp->msg_namelen, &mp32->msg_namelen);
	ret |= __get_user(i, &mp32->msg_iov);
	mp->msg_iov = (struct iovec *)A(i);
	ret |= __get_user(mp->msg_iovlen, &mp32->msg_iovlen);
	ret |= __get_user(i, &mp32->msg_control);
	mp->msg_control = (void *)A(i);
	ret |= __get_user(mp->msg_controllen, &mp32->msg_controllen);
	ret |= __get_user(mp->msg_flags, &mp32->msg_flags);
	return ret ? -EFAULT : 0;
}

/*
 * There is a lot of hair here because the alignment rules (and thus placement) of cmsg
 * headers and length are different for 32-bit apps.  -DaveM
 */
static int
get_cmsghdr32 (struct msghdr *kmsg, unsigned char *stackbuf, struct sock *sk, size_t *bufsize)
{
	struct cmsghdr *kcmsg, *kcmsg_base;
	__kernel_size_t kcmlen, tmp;
	__kernel_size_t32 ucmlen;
	struct cmsghdr32 *ucmsg;
	long err;

	kcmlen = 0;
	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
	ucmsg = CMSG32_FIRSTHDR(kmsg);
	while (ucmsg != NULL) {
		if (get_user(ucmlen, &ucmsg->cmsg_len))
			return -EFAULT;

		/* Catch bogons. */
		if (!CMSG32_OK(ucmlen, ucmsg, kmsg))
			return -EINVAL;

		tmp = ((ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
		tmp = CMSG_ALIGN(tmp);
		kcmlen += tmp;
		ucmsg = CMSG32_NXTHDR(kmsg, ucmsg, ucmlen);
	}
	if (kcmlen == 0)
		return -EINVAL;

	/*
	 * The kcmlen holds the 64-bit version of the control length.  It may not be
	 * modified as we do not stick it into the kmsg until we have successfully copied
	 * over all of the data from the user.
	 */
	if (kcmlen > *bufsize) {
		*bufsize = kcmlen;
		kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
	}
	if (kcmsg == NULL)
		return -ENOBUFS;

	/* Now copy them over neatly. */
	memset(kcmsg, 0, kcmlen);
	ucmsg = CMSG32_FIRSTHDR(kmsg);
	while (ucmsg != NULL) {
		err = get_user(ucmlen, &ucmsg->cmsg_len);
		tmp = ((ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
		kcmsg->cmsg_len = tmp;
		err |= get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level);
		err |= get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type);

		/* Copy over the data. */
		err |= copy_from_user(CMSG_DATA(kcmsg), CMSG32_DATA(ucmsg),
				      (ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))));
		if (err)
			goto out_free_efault;

		/* Advance. */
		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
		ucmsg = CMSG32_NXTHDR(kmsg, ucmsg, ucmlen);
	}

	/* Ok, looks like we made it.  Hook it up and return success. */
	kmsg->msg_control = kcmsg_base;
	kmsg->msg_controllen = kcmlen;
	return 0;

out_free_efault:
	if (kcmsg_base != (struct cmsghdr *)stackbuf)
		sock_kfree_s(sk, kcmsg_base, kcmlen);
	return -EFAULT;
}

/*
 *	Verify & re-shape IA32 iovec. The caller must ensure that the
 *      iovec is big enough to hold the re-shaped message iovec.
 *
 *	Save time not doing verify_area. copy_*_user will make this work
 *	in any case.
 *
 *	Don't need to check the total size for overflow (cf net/core/iovec.c),
 *	32-bit sizes can't overflow a 64-bit count.
 */

static inline int
verify_iovec32 (struct msghdr *m, struct iovec *iov, char *address, int mode)
{
	int size, err, ct;
	struct iovec32 *iov32;

	if (m->msg_namelen) {
		if (mode == VERIFY_READ) {
			err = move_addr_to_kernel(m->msg_name, m->msg_namelen, address);
			if (err < 0)
				goto out;
		}
		m->msg_name = address;
	} else
		m->msg_name = NULL;

	err = -EFAULT;
	size = m->msg_iovlen * sizeof(struct iovec32);
	if (copy_from_user(iov, m->msg_iov, size))
		goto out;
	m->msg_iov = iov;

	err = 0;
	iov32 = (struct iovec32 *)iov;
	for (ct = m->msg_iovlen; ct-- > 0; ) {
		iov[ct].iov_len = (__kernel_size_t)iov32[ct].iov_len;
		iov[ct].iov_base = (void *) A(iov32[ct].iov_base);
		err += iov[ct].iov_len;
	}
out:
	return err;
}

static void
put_cmsg32(struct msghdr *kmsg, int level, int type, int len, void *data)
{
	struct cmsghdr32 *cm = (struct cmsghdr32 *) kmsg->msg_control;
	struct cmsghdr32 cmhdr;
	int cmlen = CMSG32_LEN(len);

	if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
		kmsg->msg_flags |= MSG_CTRUNC;
		return;
	}

	if(kmsg->msg_controllen < cmlen) {
		kmsg->msg_flags |= MSG_CTRUNC;
		cmlen = kmsg->msg_controllen;
	}
	cmhdr.cmsg_level = level;
	cmhdr.cmsg_type = type;
	cmhdr.cmsg_len = cmlen;

	if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
		return;
	if(copy_to_user(CMSG32_DATA(cm), data,
			cmlen - sizeof(struct cmsghdr32)))
		return;
	cmlen = CMSG32_SPACE(len);
	kmsg->msg_control += cmlen;
	kmsg->msg_controllen -= cmlen;
}

static void
scm_detach_fds32 (struct msghdr *kmsg, struct scm_cookie *scm)
{
	struct cmsghdr32 *cm = (struct cmsghdr32 *) kmsg->msg_control;
	int fdmax = (kmsg->msg_controllen - sizeof(struct cmsghdr32))
		/ sizeof(int);
	int fdnum = scm->fp->count;
	struct file **fp = scm->fp->fp;
	int *cmfptr;
	int err = 0, i;

	if (fdnum < fdmax)
		fdmax = fdnum;

	for (i = 0, cmfptr = (int *) CMSG32_DATA(cm);
	     i < fdmax;
	     i++, cmfptr++) {
		int new_fd;
		err = get_unused_fd();
		if (err < 0)
			break;
		new_fd = err;
		err = put_user(new_fd, cmfptr);
		if (err) {
			put_unused_fd(new_fd);
			break;
		}
		/* Bump the usage count and install the file. */
		get_file(fp[i]);
		current->files->fd[new_fd] = fp[i];
	}

	if (i > 0) {
		int cmlen = CMSG32_LEN(i * sizeof(int));
		if (!err)
			err = put_user(SOL_SOCKET, &cm->cmsg_level);
		if (!err)
			err = put_user(SCM_RIGHTS, &cm->cmsg_type);
		if (!err)
			err = put_user(cmlen, &cm->cmsg_len);
		if (!err) {
			cmlen = CMSG32_SPACE(i * sizeof(int));
			kmsg->msg_control += cmlen;
			kmsg->msg_controllen -= cmlen;
		}
	}
	if (i < fdnum)
		kmsg->msg_flags |= MSG_CTRUNC;

	/*
	 * All of the files that fit in the message have had their
	 * usage counts incremented, so we just free the list.
	 */
	__scm_destroy(scm);
}

/*
 * In these cases we (currently) can just copy to data over verbatim because all CMSGs
 * created by the kernel have well defined types which have the same layout in both the
 * 32-bit and 64-bit API.  One must add some special cased conversions here if we start
 * sending control messages with incompatible types.
 *
 * SCM_RIGHTS and SCM_CREDENTIALS are done by hand in recvmsg32 right after
 * we do our work.  The remaining cases are:
 *
 * SOL_IP	IP_PKTINFO	struct in_pktinfo	32-bit clean
 *		IP_TTL		int			32-bit clean
 *		IP_TOS		__u8			32-bit clean
 *		IP_RECVOPTS	variable length		32-bit clean
 *		IP_RETOPTS	variable length		32-bit clean
 *		(these last two are clean because the types are defined
 *		 by the IPv4 protocol)
 *		IP_RECVERR	struct sock_extended_err +
 *				struct sockaddr_in	32-bit clean
 * SOL_IPV6	IPV6_RECVERR	struct sock_extended_err +
 *				struct sockaddr_in6	32-bit clean
 *		IPV6_PKTINFO	struct in6_pktinfo	32-bit clean
 *		IPV6_HOPLIMIT	int			32-bit clean
 *		IPV6_FLOWINFO	u32			32-bit clean
 *		IPV6_HOPOPTS	ipv6 hop exthdr		32-bit clean
 *		IPV6_DSTOPTS	ipv6 dst exthdr(s)	32-bit clean
 *		IPV6_RTHDR	ipv6 routing exthdr	32-bit clean
 *		IPV6_AUTHHDR	ipv6 auth exthdr	32-bit clean
 */
static void
cmsg32_recvmsg_fixup (struct msghdr *kmsg, unsigned long orig_cmsg_uptr,
		__kernel_size_t orig_cmsg_len)
{
	unsigned char *workbuf, *wp;
	unsigned long bufsz, space_avail;
	struct cmsghdr *ucmsg;
	long err;

	bufsz = ((unsigned long)kmsg->msg_control) - orig_cmsg_uptr;
	space_avail = kmsg->msg_controllen + bufsz;
	wp = workbuf = kmalloc(bufsz, GFP_KERNEL);
	if (workbuf == NULL)
		goto fail;

	/* To make this more sane we assume the kernel sends back properly
	 * formatted control messages.  Because of how the kernel will truncate
	 * the cmsg_len for MSG_TRUNC cases, we need not check that case either.
	 */
	ucmsg = (struct cmsghdr *) orig_cmsg_uptr;
	while (((unsigned long)ucmsg) < ((unsigned long)kmsg->msg_control)) {
		struct cmsghdr32 *kcmsg32 = (struct cmsghdr32 *) wp;
		int clen64, clen32;

		/*
		 * UCMSG is the 64-bit format CMSG entry in user-space.  KCMSG32 is within
		 * the kernel space temporary buffer we use to convert into a 32-bit style
		 * CMSG.
		 */
		err = get_user(kcmsg32->cmsg_len, &ucmsg->cmsg_len);
		err |= get_user(kcmsg32->cmsg_level, &ucmsg->cmsg_level);
		err |= get_user(kcmsg32->cmsg_type, &ucmsg->cmsg_type);
		if (err)
			goto fail2;

		clen64 = kcmsg32->cmsg_len;
		if ((clen64 < CMSG_ALIGN(sizeof(*ucmsg))) ||
				(clen64 > (orig_cmsg_len + wp - workbuf)))
			break;
		copy_from_user(CMSG32_DATA(kcmsg32), CMSG_DATA(ucmsg),
			       clen64 - CMSG_ALIGN(sizeof(*ucmsg)));
		clen32 = ((clen64 - CMSG_ALIGN(sizeof(*ucmsg))) +
			  CMSG32_ALIGN(sizeof(struct cmsghdr32)));
		kcmsg32->cmsg_len = clen32;

		ucmsg = (struct cmsghdr *) (((char *)ucmsg) + CMSG_ALIGN(clen64));
		wp = (((char *)kcmsg32) + CMSG32_ALIGN(clen32));
	}

	/* Copy back fixed up data, and adjust pointers. */
	bufsz = (wp - workbuf);
	if (copy_to_user((void *)orig_cmsg_uptr, workbuf, bufsz))
		goto fail2;

	kmsg->msg_control = (struct cmsghdr *) (((char *)orig_cmsg_uptr) + bufsz);
	kmsg->msg_controllen = space_avail - bufsz;
	kfree(workbuf);
	return;

  fail2:
	kfree(workbuf);
  fail:
	/*
	 * If we leave the 64-bit format CMSG chunks in there, the application could get
	 * confused and crash.  So to ensure greater recovery, we report no CMSGs.
	 */
	kmsg->msg_controllen += bufsz;
	kmsg->msg_control = (void *) orig_cmsg_uptr;
}

static inline void
sockfd_put (struct socket *sock)
{
	fput(sock->file);
}

/* XXX This really belongs in some header file... -DaveM */
#define MAX_SOCK_ADDR	128		/* 108 for Unix domain -
					   16 for IP, 16 for IPX,
					   24 for IPv6,
					   about 80 for AX.25 */

extern struct socket *sockfd_lookup (int fd, int *err);

/*
 *	BSD sendmsg interface
 */

int
sys32_sendmsg (int fd, struct msghdr32 *msg, unsigned flags)
{
	struct socket *sock;
	char address[MAX_SOCK_ADDR];
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
	unsigned char ctl[sizeof(struct cmsghdr) + 20];	/* 20 is size of ipv6_pktinfo */
	unsigned char *ctl_buf = ctl;
	struct msghdr msg_sys;
	int err, iov_size, total_len;
	size_t ctl_len;

	err = -EFAULT;
	if (get_msghdr32(&msg_sys, msg))
		goto out;

	sock = sockfd_lookup(fd, &err);
	if (!sock)
		goto out;

	/* do not move before msg_sys is valid */
	err = -EINVAL;
	if (msg_sys.msg_iovlen > UIO_MAXIOV)
		goto out_put;

	/* Check whether to allocate the iovec area*/
	err = -ENOMEM;
	iov_size = msg_sys.msg_iovlen * sizeof(struct iovec32);
	if (msg_sys.msg_iovlen > UIO_FASTIOV) {
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
			goto out_put;
	}

	/* This will also move the address data into kernel space */
	err = verify_iovec32(&msg_sys, iov, address, VERIFY_READ);
	if (err < 0)
		goto out_freeiov;
	total_len = err;

	err = -ENOBUFS;

	if (msg_sys.msg_controllen > INT_MAX)
		goto out_freeiov;
	if (msg_sys.msg_controllen) {
		ctl_len = sizeof(ctl);
		err = get_cmsghdr32(&msg_sys, ctl_buf, sock->sk, &ctl_len);
		if (err)
			goto out_freeiov;
		ctl_buf = msg_sys.msg_control;
	}
	msg_sys.msg_flags = flags;

	if (sock->file->f_flags & O_NONBLOCK)
		msg_sys.msg_flags |= MSG_DONTWAIT;
	err = sock_sendmsg(sock, &msg_sys, total_len);

	if (ctl_buf != ctl)
		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
out_put:
	sockfd_put(sock);
out:
	return err;
}

/*
 *	BSD recvmsg interface
 */

int
sys32_recvmsg (int fd, struct msghdr32 *msg, unsigned int flags)
{
	struct socket *sock;
	struct iovec iovstack[UIO_FASTIOV];
	struct iovec *iov=iovstack;
	struct msghdr msg_sys;
	unsigned long cmsg_ptr;
	__kernel_size_t cmsg_len;
	int err, iov_size, total_len, len;
	struct scm_cookie scm;

	/* kernel mode address */
	char addr[MAX_SOCK_ADDR];

	/* user mode address pointers */
	struct sockaddr *uaddr;
	int *uaddr_len;

	err = -EFAULT;
	if (get_msghdr32(&msg_sys, msg))
		goto out;

	sock = sockfd_lookup(fd, &err);
	if (!sock)
		goto out;

	err = -EINVAL;
	if (msg_sys.msg_iovlen > UIO_MAXIOV)
		goto out_put;

	/* Check whether to allocate the iovec area*/
	err = -ENOMEM;
	iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
	if (msg_sys.msg_iovlen > UIO_FASTIOV) {
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
			goto out_put;
	}

	/*
	 *	Save the user-mode address (verify_iovec will change the
	 *	kernel msghdr to use the kernel address space)
	 */

	uaddr = msg_sys.msg_name;
	uaddr_len = &msg->msg_namelen;
	err = verify_iovec32(&msg_sys, iov, addr, VERIFY_WRITE);
	if (err < 0)
		goto out_freeiov;
	total_len=err;

	cmsg_ptr = (unsigned long)msg_sys.msg_control;
	cmsg_len = msg_sys.msg_controllen;
	msg_sys.msg_flags = 0;

	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;

	memset(&scm, 0, sizeof(scm));

	lock_kernel();
	{
		err = sock->ops->recvmsg(sock, &msg_sys, total_len, flags, &scm);
		if (err < 0)
			goto out_unlock_freeiov;

		len = err;
		if (!msg_sys.msg_control) {
			if (sock->passcred || scm.fp)
				msg_sys.msg_flags |= MSG_CTRUNC;
			if (scm.fp)
				__scm_destroy(&scm);
		} else {
			/*
			 * If recvmsg processing itself placed some control messages into
			 * user space, it's is using 64-bit CMSG processing, so we need to
			 * fix it up before we tack on more stuff.
			 */
			if ((unsigned long) msg_sys.msg_control != cmsg_ptr)
				cmsg32_recvmsg_fixup(&msg_sys, cmsg_ptr,
						cmsg_len);

			/* Wheee... */
			if (sock->passcred)
				put_cmsg32(&msg_sys, SOL_SOCKET, SCM_CREDENTIALS,
					   sizeof(scm.creds), &scm.creds);
			if (scm.fp != NULL)
				scm_detach_fds32(&msg_sys, &scm);
		}
	}
	unlock_kernel();

	if (uaddr != NULL) {
		err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len);
		if (err < 0)
			goto out_freeiov;
	}
	err = __put_user(msg_sys.msg_flags, &msg->msg_flags);
	if (err)
		goto out_freeiov;
	err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
							 &msg->msg_controllen);
	if (err)
		goto out_freeiov;
	err = len;

  out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
  out_put:
	sockfd_put(sock);
  out:
	return err;

  out_unlock_freeiov:
	goto out_freeiov;
}

/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(u32))
static const unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
				    AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
				    AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
#undef AL

extern asmlinkage long sys_bind(int fd, struct sockaddr *umyaddr, int addrlen);
extern asmlinkage long sys_connect(int fd, struct sockaddr *uservaddr,
				  int addrlen);
extern asmlinkage long sys_accept(int fd, struct sockaddr *upeer_sockaddr,
				 int *upeer_addrlen);
extern asmlinkage long sys_getsockname(int fd, struct sockaddr *usockaddr,
				      int *usockaddr_len);
extern asmlinkage long sys_getpeername(int fd, struct sockaddr *usockaddr,
				      int *usockaddr_len);
extern asmlinkage long sys_send(int fd, void *buff, size_t len, unsigned flags);
extern asmlinkage long sys_sendto(int fd, u32 buff, __kernel_size_t32 len,
				   unsigned flags, u32 addr, int addr_len);
extern asmlinkage long sys_recv(int fd, void *ubuf, size_t size, unsigned flags);
extern asmlinkage long sys_recvfrom(int fd, u32 ubuf, __kernel_size_t32 size,
				     unsigned flags, u32 addr, u32 addr_len);
extern asmlinkage long sys_setsockopt(int fd, int level, int optname,
				     char *optval, int optlen);
extern asmlinkage long sys_getsockopt(int fd, int level, int optname,
				       u32 optval, u32 optlen);

extern asmlinkage long sys_socket(int family, int type, int protocol);
extern asmlinkage long sys_socketpair(int family, int type, int protocol,
				     int usockvec[2]);
extern asmlinkage long sys_shutdown(int fd, int how);
extern asmlinkage long sys_listen(int fd, int backlog);

asmlinkage long
sys32_socketcall (int call, u32 *args)
{
	int ret;
	u32 a[6];
	u32 a0,a1;

	if (call<SYS_SOCKET||call>SYS_RECVMSG)
		return -EINVAL;
	if (copy_from_user(a, args, nas[call]))
		return -EFAULT;
	a0=a[0];
	a1=a[1];

	switch(call)
	{
		case SYS_SOCKET:
			ret = sys_socket(a0, a1, a[2]);
			break;
		case SYS_BIND:
			ret = sys_bind(a0, (struct sockaddr *)A(a1), a[2]);
			break;
		case SYS_CONNECT:
			ret = sys_connect(a0, (struct sockaddr *)A(a1), a[2]);
			break;
		case SYS_LISTEN:
			ret = sys_listen(a0, a1);
			break;
		case SYS_ACCEPT:
			ret = sys_accept(a0, (struct sockaddr *)A(a1), (int *)A(a[2]));
			break;
		case SYS_GETSOCKNAME:
			ret = sys_getsockname(a0, (struct sockaddr *)A(a1), (int *)A(a[2]));
			break;
		case SYS_GETPEERNAME:
			ret = sys_getpeername(a0, (struct sockaddr *)A(a1), (int *)A(a[2]));
			break;
		case SYS_SOCKETPAIR:
			ret = sys_socketpair(a0, a1, a[2], (int *)A(a[3]));
			break;
		case SYS_SEND:
			ret = sys_send(a0, (void *)A(a1), a[2], a[3]);
			break;
		case SYS_SENDTO:
			ret = sys_sendto(a0, a1, a[2], a[3], a[4], a[5]);
			break;
		case SYS_RECV:
			ret = sys_recv(a0, (void *)A(a1), a[2], a[3]);
			break;
		case SYS_RECVFROM:
			ret = sys_recvfrom(a0, a1, a[2], a[3], a[4], a[5]);
			break;
		case SYS_SHUTDOWN:
			ret = sys_shutdown(a0,a1);
			break;
		case SYS_SETSOCKOPT:
			ret = sys_setsockopt(a0, a1, a[2], (char *)A(a[3]),
					      a[4]);
			break;
		case SYS_GETSOCKOPT:
			ret = sys_getsockopt(a0, a1, a[2], a[3], a[4]);
			break;
		case SYS_SENDMSG:
			ret = sys32_sendmsg(a0, (struct msghdr32 *) A(a1), a[2]);
			break;
		case SYS_RECVMSG:
			ret = sys32_recvmsg(a0, (struct msghdr32 *) A(a1), a[2]);
			break;
		default:
			ret = EINVAL;
			break;
	}
	return ret;
}

/*
 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation..
 *
 * This is really horribly ugly.
 */

struct msgbuf32 { s32 mtype; char mtext[1]; };

struct ipc_perm32 {
	key_t key;
	__kernel_uid_t32 uid;
	__kernel_gid_t32 gid;
	__kernel_uid_t32 cuid;
	__kernel_gid_t32 cgid;
	__kernel_mode_t32 mode;
	unsigned short seq;
};

struct ipc64_perm32 {
	key_t key;
	__kernel_uid32_t32 uid;
	__kernel_gid32_t32 gid;
	__kernel_uid32_t32 cuid;
	__kernel_gid32_t32 cgid;
	__kernel_mode_t32 mode;
	unsigned short __pad1;
	unsigned short seq;
	unsigned short __pad2;
	unsigned int unused1;
	unsigned int unused2;
};

struct semid_ds32 {
	struct ipc_perm32 sem_perm;               /* permissions .. see ipc.h */
	__kernel_time_t32 sem_otime;              /* last semop time */
	__kernel_time_t32 sem_ctime;              /* last change time */
	u32 sem_base;              /* ptr to first semaphore in array */
	u32 sem_pending;          /* pending operations to be processed */
	u32 sem_pending_last;    /* last pending operation */
	u32 undo;                  /* undo requests on this array */
	unsigned short  sem_nsems;              /* no. of semaphores in array */
};

struct semid64_ds32 {
	struct ipc64_perm32 sem_perm;
	__kernel_time_t32 sem_otime;
	unsigned int __unused1;
	__kernel_time_t32 sem_ctime;
	unsigned int __unused2;
	unsigned int sem_nsems;
	unsigned int __unused3;
	unsigned int __unused4;
};

struct msqid_ds32 {
	struct ipc_perm32 msg_perm;
	u32 msg_first;
	u32 msg_last;
	__kernel_time_t32 msg_stime;
	__kernel_time_t32 msg_rtime;
	__kernel_time_t32 msg_ctime;
	u32 wwait;
	u32 rwait;
	unsigned short msg_cbytes;
	unsigned short msg_qnum;
	unsigned short msg_qbytes;
	__kernel_ipc_pid_t32 msg_lspid;
	__kernel_ipc_pid_t32 msg_lrpid;
};

struct msqid64_ds32 {
	struct ipc64_perm32 msg_perm;
	__kernel_time_t32 msg_stime;
	unsigned int __unused1;
	__kernel_time_t32 msg_rtime;
	unsigned int __unused2;
	__kernel_time_t32 msg_ctime;
	unsigned int __unused3;
	unsigned int msg_cbytes;
	unsigned int msg_qnum;
	unsigned int msg_qbytes;
	__kernel_pid_t32 msg_lspid;
	__kernel_pid_t32 msg_lrpid;
	unsigned int __unused4;
	unsigned int __unused5;
};

struct shmid_ds32 {
	struct ipc_perm32 shm_perm;
	int shm_segsz;
	__kernel_time_t32 shm_atime;
	__kernel_time_t32 shm_dtime;
	__kernel_time_t32 shm_ctime;
	__kernel_ipc_pid_t32 shm_cpid;
	__kernel_ipc_pid_t32 shm_lpid;
	unsigned short shm_nattch;
};

struct shmid64_ds32 {
	struct ipc64_perm32 shm_perm;
	__kernel_size_t32 shm_segsz;
	__kernel_time_t32 shm_atime;
	unsigned int __unused1;
	__kernel_time_t32 shm_dtime;
	unsigned int __unused2;
	__kernel_time_t32 shm_ctime;
	unsigned int __unused3;
	__kernel_pid_t32 shm_cpid;
	__kernel_pid_t32 shm_lpid;
	unsigned int shm_nattch;
	unsigned int __unused4;
	unsigned int __unused5;
};

struct shminfo64_32 {
	unsigned int shmmax;
	unsigned int shmmin;
	unsigned int shmmni;
	unsigned int shmseg;
	unsigned int shmall;
	unsigned int __unused1;
	unsigned int __unused2;
	unsigned int __unused3;
	unsigned int __unused4;
};

struct shm_info32 {
	int used_ids;
	u32 shm_tot, shm_rss, shm_swp;
	u32 swap_attempts, swap_successes;
};

struct ipc_kludge {
	u32 msgp;
	s32 msgtyp;
};

#define SEMOP		 1
#define SEMGET		 2
#define SEMCTL		 3
#define MSGSND		11
#define MSGRCV		12
#define MSGGET		13
#define MSGCTL		14
#define SHMAT		21
#define SHMDT		22
#define SHMGET		23
#define SHMCTL		24

#define IPCOP_MASK(__x)	(1UL << (__x))

static int
ipc_parse_version32 (int *cmd)
{
	if (*cmd & IPC_64) {
		*cmd ^= IPC_64;
		return IPC_64;
	} else {
		return IPC_OLD;
	}
}

static int
semctl32 (int first, int second, int third, void *uptr)
{
	union semun fourth;
	u32 pad;
	int err = 0, err2;
	struct semid64_ds s;
	mm_segment_t old_fs;
	int version = ipc_parse_version32(&third);

	if (!uptr)
		return -EINVAL;
	if (get_user(pad, (u32 *)uptr))
		return -EFAULT;
	if (third == SETVAL)
		fourth.val = (int)pad;
	else
		fourth.__pad = (void *)A(pad);
	switch (third) {
	      default:
		err = -EINVAL;
		break;

	      case IPC_INFO:
	      case IPC_RMID:
	      case IPC_SET:
	      case SEM_INFO:
	      case GETVAL:
	      case GETPID:
	      case GETNCNT:
	      case GETZCNT:
	      case GETALL:
	      case SETVAL:
	      case SETALL:
		err = sys_semctl(first, second, third, fourth);
		break;

	      case IPC_STAT:
	      case SEM_STAT:
		fourth.__pad = &s;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_semctl(first, second, third, fourth);
		set_fs(old_fs);

		if (version == IPC_64) {
			struct semid64_ds32 *usp64 = (struct semid64_ds32 *) A(pad);

			if (!access_ok(VERIFY_WRITE, usp64, sizeof(*usp64))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s.sem_perm.key, &usp64->sem_perm.key);
			err2 |= __put_user(s.sem_perm.uid, &usp64->sem_perm.uid);
			err2 |= __put_user(s.sem_perm.gid, &usp64->sem_perm.gid);
			err2 |= __put_user(s.sem_perm.cuid, &usp64->sem_perm.cuid);
			err2 |= __put_user(s.sem_perm.cgid, &usp64->sem_perm.cgid);
			err2 |= __put_user(s.sem_perm.mode, &usp64->sem_perm.mode);
			err2 |= __put_user(s.sem_perm.seq, &usp64->sem_perm.seq);
			err2 |= __put_user(s.sem_otime, &usp64->sem_otime);
			err2 |= __put_user(s.sem_ctime, &usp64->sem_ctime);
			err2 |= __put_user(s.sem_nsems, &usp64->sem_nsems);
		} else {
			struct semid_ds32 *usp32 = (struct semid_ds32 *) A(pad);

			if (!access_ok(VERIFY_WRITE, usp32, sizeof(*usp32))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s.sem_perm.key, &usp32->sem_perm.key);
			err2 |= __put_user(s.sem_perm.uid, &usp32->sem_perm.uid);
			err2 |= __put_user(s.sem_perm.gid, &usp32->sem_perm.gid);
			err2 |= __put_user(s.sem_perm.cuid, &usp32->sem_perm.cuid);
			err2 |= __put_user(s.sem_perm.cgid, &usp32->sem_perm.cgid);
			err2 |= __put_user(s.sem_perm.mode, &usp32->sem_perm.mode);
			err2 |= __put_user(s.sem_perm.seq, &usp32->sem_perm.seq);
			err2 |= __put_user(s.sem_otime, &usp32->sem_otime);
			err2 |= __put_user(s.sem_ctime, &usp32->sem_ctime);
			err2 |= __put_user(s.sem_nsems, &usp32->sem_nsems);
		}
		if (err2)
		    err = -EFAULT;
		break;
	}
	return err;
}

static int
do_sys32_msgsnd (int first, int second, int third, void *uptr)
{
	struct msgbuf *p = kmalloc(second + sizeof(struct msgbuf), GFP_USER);
	struct msgbuf32 *up = (struct msgbuf32 *)uptr;
	mm_segment_t old_fs;
	int err;

	if (!p)
		return -ENOMEM;
	err = get_user(p->mtype, &up->mtype);
	err |= copy_from_user(p->mtext, &up->mtext, second);
	if (err)
		goto out;
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_msgsnd(first, p, second, third);
	set_fs(old_fs);
  out:
	kfree(p);
	return err;
}

static int
do_sys32_msgrcv (int first, int second, int msgtyp, int third, int version, void *uptr)
{
	struct msgbuf32 *up;
	struct msgbuf *p;
	mm_segment_t old_fs;
	int err;

	if (!version) {
		struct ipc_kludge *uipck = (struct ipc_kludge *)uptr;
		struct ipc_kludge ipck;

		err = -EINVAL;
		if (!uptr)
			goto out;
		err = -EFAULT;
		if (copy_from_user(&ipck, uipck, sizeof(struct ipc_kludge)))
			goto out;
		uptr = (void *)A(ipck.msgp);
		msgtyp = ipck.msgtyp;
	}
	err = -ENOMEM;
	p = kmalloc(second + sizeof(struct msgbuf), GFP_USER);
	if (!p)
		goto out;
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_msgrcv(first, p, second, msgtyp, third);
	set_fs(old_fs);
	if (err < 0)
		goto free_then_out;
	up = (struct msgbuf32 *)uptr;
	if (put_user(p->mtype, &up->mtype) || copy_to_user(&up->mtext, p->mtext, err))
		err = -EFAULT;
free_then_out:
	kfree(p);
out:
	return err;
}

static int
msgctl32 (int first, int second, void *uptr)
{
	int err = -EINVAL, err2;
	struct msqid_ds m;
	struct msqid64_ds m64;
	struct msqid_ds32 *up32 = (struct msqid_ds32 *)uptr;
	struct msqid64_ds32 *up64 = (struct msqid64_ds32 *)uptr;
	mm_segment_t old_fs;
	int version = ipc_parse_version32(&second);

	switch (second) {
	      case IPC_INFO:
	      case IPC_RMID:
	      case MSG_INFO:
		err = sys_msgctl(first, second, (struct msqid_ds *)uptr);
		break;

	      case IPC_SET:
		if (version == IPC_64) {
			err = get_user(m64.msg_perm.uid, &up64->msg_perm.uid);
			err |= get_user(m64.msg_perm.gid, &up64->msg_perm.gid);
			err |= get_user(m64.msg_perm.mode, &up64->msg_perm.mode);
			err |= get_user(m64.msg_qbytes, &up64->msg_qbytes);
		} else {
			err = get_user(m64.msg_perm.uid, &up32->msg_perm.uid);
			err |= get_user(m64.msg_perm.gid, &up32->msg_perm.gid);
			err |= get_user(m64.msg_perm.mode, &up32->msg_perm.mode);
			err |= get_user(m64.msg_qbytes, &up32->msg_qbytes);
		}
		if (err)
			break;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_msgctl(first, second, &m64);
		set_fs(old_fs);
		break;

	      case IPC_STAT:
	      case MSG_STAT:
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_msgctl(first, second, (void *) &m64);
		set_fs(old_fs);

		if (version == IPC_64) {
			if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(m64.msg_perm.key, &up64->msg_perm.key);
			err2 |= __put_user(m64.msg_perm.uid, &up64->msg_perm.uid);
			err2 |= __put_user(m64.msg_perm.gid, &up64->msg_perm.gid);
			err2 |= __put_user(m64.msg_perm.cuid, &up64->msg_perm.cuid);
			err2 |= __put_user(m64.msg_perm.cgid, &up64->msg_perm.cgid);
			err2 |= __put_user(m64.msg_perm.mode, &up64->msg_perm.mode);
			err2 |= __put_user(m64.msg_perm.seq, &up64->msg_perm.seq);
			err2 |= __put_user(m64.msg_stime, &up64->msg_stime);
			err2 |= __put_user(m64.msg_rtime, &up64->msg_rtime);
			err2 |= __put_user(m64.msg_ctime, &up64->msg_ctime);
			err2 |= __put_user(m64.msg_cbytes, &up64->msg_cbytes);
			err2 |= __put_user(m64.msg_qnum, &up64->msg_qnum);
			err2 |= __put_user(m64.msg_qbytes, &up64->msg_qbytes);
			err2 |= __put_user(m64.msg_lspid, &up64->msg_lspid);
			err2 |= __put_user(m64.msg_lrpid, &up64->msg_lrpid);
			if (err2)
				err = -EFAULT;
		} else {
			if (!access_ok(VERIFY_WRITE, up32, sizeof(*up32))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(m64.msg_perm.key, &up32->msg_perm.key);
			err2 |= __put_user(m64.msg_perm.uid, &up32->msg_perm.uid);
			err2 |= __put_user(m64.msg_perm.gid, &up32->msg_perm.gid);
			err2 |= __put_user(m64.msg_perm.cuid, &up32->msg_perm.cuid);
			err2 |= __put_user(m64.msg_perm.cgid, &up32->msg_perm.cgid);
			err2 |= __put_user(m64.msg_perm.mode, &up32->msg_perm.mode);
			err2 |= __put_user(m64.msg_perm.seq, &up32->msg_perm.seq);
			err2 |= __put_user(m64.msg_stime, &up32->msg_stime);
			err2 |= __put_user(m64.msg_rtime, &up32->msg_rtime);
			err2 |= __put_user(m64.msg_ctime, &up32->msg_ctime);
			err2 |= __put_user(m64.msg_cbytes, &up32->msg_cbytes);
			err2 |= __put_user(m64.msg_qnum, &up32->msg_qnum);
			err2 |= __put_user(m64.msg_qbytes, &up32->msg_qbytes);
			err2 |= __put_user(m64.msg_lspid, &up32->msg_lspid);
			err2 |= __put_user(m64.msg_lrpid, &up32->msg_lrpid);
			if (err2)
				err = -EFAULT;
		}
		break;
	}
	return err;
}

static int
shmat32 (int first, int second, int third, int version, void *uptr)
{
	unsigned long raddr;
	u32 *uaddr = (u32 *)A((u32)third);
	int err;

	if (version == 1)
		return -EINVAL;	/* iBCS2 emulator entry point: unsupported */
	err = sys_shmat(first, uptr, second, &raddr);
	if (err)
		return err;
	return put_user(raddr, uaddr);
}

static int
shmctl32 (int first, int second, void *uptr)
{
	int err = -EFAULT, err2;

	struct shmid64_ds s64;
	struct shmid_ds32 *up32 = (struct shmid_ds32 *)uptr;
	struct shmid64_ds32 *up64 = (struct shmid64_ds32 *)uptr;
	mm_segment_t old_fs;
	struct shm_info32 *uip = (struct shm_info32 *)uptr;
	struct shm_info si;
	int version = ipc_parse_version32(&second);
	struct shminfo64 smi;
	struct shminfo *usi32 = (struct shminfo *) uptr;
	struct shminfo64_32 *usi64 = (struct shminfo64_32 *) uptr;

	switch (second) {
	      case IPC_INFO:
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_shmctl(first, second, (struct shmid_ds *)&smi);
		set_fs(old_fs);

		if (version == IPC_64) {
			if (!access_ok(VERIFY_WRITE, usi64, sizeof(*usi64))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(smi.shmmax, &usi64->shmmax);
			err2 |= __put_user(smi.shmmin, &usi64->shmmin);
			err2 |= __put_user(smi.shmmni, &usi64->shmmni);
			err2 |= __put_user(smi.shmseg, &usi64->shmseg);
			err2 |= __put_user(smi.shmall, &usi64->shmall);
		} else {
			if (!access_ok(VERIFY_WRITE, usi32, sizeof(*usi32))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(smi.shmmax, &usi32->shmmax);
			err2 |= __put_user(smi.shmmin, &usi32->shmmin);
			err2 |= __put_user(smi.shmmni, &usi32->shmmni);
			err2 |= __put_user(smi.shmseg, &usi32->shmseg);
			err2 |= __put_user(smi.shmall, &usi32->shmall);
		}
		if (err2)
			err = -EFAULT;
		break;

	      case IPC_RMID:
	      case SHM_LOCK:
	      case SHM_UNLOCK:
		err = sys_shmctl(first, second, (struct shmid_ds *)uptr);
		break;

	      case IPC_SET:
		if (version == IPC_64) {
			err = get_user(s64.shm_perm.uid, &up64->shm_perm.uid);
			err |= get_user(s64.shm_perm.gid, &up64->shm_perm.gid);
			err |= get_user(s64.shm_perm.mode, &up64->shm_perm.mode);
		} else {
			err = get_user(s64.shm_perm.uid, &up32->shm_perm.uid);
			err |= get_user(s64.shm_perm.gid, &up32->shm_perm.gid);
			err |= get_user(s64.shm_perm.mode, &up32->shm_perm.mode);
		}
		if (err)
			break;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_shmctl(first, second, &s64);
		set_fs(old_fs);
		break;

	      case IPC_STAT:
	      case SHM_STAT:
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_shmctl(first, second, (void *) &s64);
		set_fs(old_fs);
		if (err < 0)
			break;
		if (version == IPC_64) {
			if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s64.shm_perm.key, &up64->shm_perm.key);
			err2 |= __put_user(s64.shm_perm.uid, &up64->shm_perm.uid);
			err2 |= __put_user(s64.shm_perm.gid, &up64->shm_perm.gid);
			err2 |= __put_user(s64.shm_perm.cuid, &up64->shm_perm.cuid);
			err2 |= __put_user(s64.shm_perm.cgid, &up64->shm_perm.cgid);
			err2 |= __put_user(s64.shm_perm.mode, &up64->shm_perm.mode);
			err2 |= __put_user(s64.shm_perm.seq, &up64->shm_perm.seq);
			err2 |= __put_user(s64.shm_atime, &up64->shm_atime);
			err2 |= __put_user(s64.shm_dtime, &up64->shm_dtime);
			err2 |= __put_user(s64.shm_ctime, &up64->shm_ctime);
			err2 |= __put_user(s64.shm_segsz, &up64->shm_segsz);
			err2 |= __put_user(s64.shm_nattch, &up64->shm_nattch);
			err2 |= __put_user(s64.shm_cpid, &up64->shm_cpid);
			err2 |= __put_user(s64.shm_lpid, &up64->shm_lpid);
		} else {
			if (!access_ok(VERIFY_WRITE, up32, sizeof(*up32))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s64.shm_perm.key, &up32->shm_perm.key);
			err2 |= __put_user(s64.shm_perm.uid, &up32->shm_perm.uid);
			err2 |= __put_user(s64.shm_perm.gid, &up32->shm_perm.gid);
			err2 |= __put_user(s64.shm_perm.cuid, &up32->shm_perm.cuid);
			err2 |= __put_user(s64.shm_perm.cgid, &up32->shm_perm.cgid);
			err2 |= __put_user(s64.shm_perm.mode, &up32->shm_perm.mode);
			err2 |= __put_user(s64.shm_perm.seq, &up32->shm_perm.seq);
			err2 |= __put_user(s64.shm_atime, &up32->shm_atime);
			err2 |= __put_user(s64.shm_dtime, &up32->shm_dtime);
			err2 |= __put_user(s64.shm_ctime, &up32->shm_ctime);
			err2 |= __put_user(s64.shm_segsz, &up32->shm_segsz);
			err2 |= __put_user(s64.shm_nattch, &up32->shm_nattch);
			err2 |= __put_user(s64.shm_cpid, &up32->shm_cpid);
			err2 |= __put_user(s64.shm_lpid, &up32->shm_lpid);
		}
		if (err2)
			err = -EFAULT;
		break;

	      case SHM_INFO:
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_shmctl(first, second, (void *)&si);
		set_fs(old_fs);
		if (err < 0)
			break;

		if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip))) {
			err = -EFAULT;
			break;
		}
		err2 = __put_user(si.used_ids, &uip->used_ids);
		err2 |= __put_user(si.shm_tot, &uip->shm_tot);
		err2 |= __put_user(si.shm_rss, &uip->shm_rss);
		err2 |= __put_user(si.shm_swp, &uip->shm_swp);
		err2 |= __put_user(si.swap_attempts, &uip->swap_attempts);
		err2 |= __put_user(si.swap_successes, &uip->swap_successes);
		if (err2)
			err = -EFAULT;
		break;

	}
	return err;
}

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

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

	switch (call) {
	      case SEMOP:
		/* struct sembuf is the same on 32 and 64bit :)) */
		return sys_semop(first, (struct sembuf *)AA(ptr), second);
	      case SEMGET:
		return sys_semget(first, second, third);
	      case SEMCTL:
		return semctl32(first, second, third, (void *)AA(ptr));

	      case MSGSND:
		return do_sys32_msgsnd(first, second, third, (void *)AA(ptr));
	      case MSGRCV:
		return do_sys32_msgrcv(first, second, fifth, third, version, (void *)AA(ptr));
	      case MSGGET:
		return sys_msgget((key_t) first, second);
	      case MSGCTL:
		return msgctl32(first, second, (void *)AA(ptr));

	      case SHMAT:
		return shmat32(first, second, third, version, (void *)AA(ptr));
		break;
	      case SHMDT:
		return sys_shmdt((char *)AA(ptr));
	      case SHMGET:
		return sys_shmget(first, second, third);
	      case SHMCTL:
		return shmctl32(first, second, (void *)AA(ptr));

	      default:
		return -ENOSYS;
	}
	return -EINVAL;
}

/*
 * sys_time() can be implemented in user-level using
 * sys_gettimeofday().  IA64 did this but i386 Linux did not
 * so we have to implement this system call here.
 */
asmlinkage long
sys32_time (int *tloc)
{
	int i;

	/* SMP: This is fairly trivial. We grab CURRENT_TIME and
	   stuff it to user space. No side effects */
	i = CURRENT_TIME;
	if (tloc) {
		if (put_user(i, tloc))
			i = -EFAULT;
	}
	return i;
}

struct rusage32 {
	struct timeval32 ru_utime;
	struct timeval32 ru_stime;
	int    ru_maxrss;
	int    ru_ixrss;
	int    ru_idrss;
	int    ru_isrss;
	int    ru_minflt;
	int    ru_majflt;
	int    ru_nswap;
	int    ru_inblock;
	int    ru_oublock;
	int    ru_msgsnd;
	int    ru_msgrcv;
	int    ru_nsignals;
	int    ru_nvcsw;
	int    ru_nivcsw;
};

static int
put_rusage (struct rusage32 *ru, struct rusage *r)
{
	int err;

	if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
		return -EFAULT;

	err = __put_user (r->ru_utime.tv_sec, &ru->ru_utime.tv_sec);
	err |= __put_user (r->ru_utime.tv_usec, &ru->ru_utime.tv_usec);
	err |= __put_user (r->ru_stime.tv_sec, &ru->ru_stime.tv_sec);
	err |= __put_user (r->ru_stime.tv_usec, &ru->ru_stime.tv_usec);
	err |= __put_user (r->ru_maxrss, &ru->ru_maxrss);
	err |= __put_user (r->ru_ixrss, &ru->ru_ixrss);
	err |= __put_user (r->ru_idrss, &ru->ru_idrss);
	err |= __put_user (r->ru_isrss, &ru->ru_isrss);
	err |= __put_user (r->ru_minflt, &ru->ru_minflt);
	err |= __put_user (r->ru_majflt, &ru->ru_majflt);
	err |= __put_user (r->ru_nswap, &ru->ru_nswap);
	err |= __put_user (r->ru_inblock, &ru->ru_inblock);
	err |= __put_user (r->ru_oublock, &ru->ru_oublock);
	err |= __put_user (r->ru_msgsnd, &ru->ru_msgsnd);
	err |= __put_user (r->ru_msgrcv, &ru->ru_msgrcv);
	err |= __put_user (r->ru_nsignals, &ru->ru_nsignals);
	err |= __put_user (r->ru_nvcsw, &ru->ru_nvcsw);
	err |= __put_user (r->ru_nivcsw, &ru->ru_nivcsw);
	return err;
}

asmlinkage long
sys32_wait4 (int pid, unsigned int *stat_addr, int options, struct rusage32 *ru)
{
	if (!ru)
		return sys_wait4(pid, stat_addr, options, NULL);
	else {
		struct rusage r;
		int ret;
		unsigned int status;
		mm_segment_t old_fs = get_fs();

		set_fs(KERNEL_DS);
		ret = sys_wait4(pid, stat_addr ? &status : NULL, options, &r);
		set_fs(old_fs);
		if (put_rusage(ru, &r))
			return -EFAULT;
		if (stat_addr && put_user(status, stat_addr))
			return -EFAULT;
		return ret;
	}
}

asmlinkage long
sys32_waitpid (int pid, unsigned int *stat_addr, int options)
{
	return sys32_wait4(pid, stat_addr, options, NULL);
}


extern asmlinkage long sys_getrusage (int who, struct rusage *ru);

asmlinkage long
sys32_getrusage (int who, struct rusage32 *ru)
{
	struct rusage r;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_getrusage(who, &r);
	set_fs(old_fs);
	if (put_rusage (ru, &r))
		return -EFAULT;
	return ret;
}

struct tms32 {
	__kernel_clock_t32 tms_utime;
	__kernel_clock_t32 tms_stime;
	__kernel_clock_t32 tms_cutime;
	__kernel_clock_t32 tms_cstime;
};

extern asmlinkage long sys_times (struct tms * tbuf);

asmlinkage long
sys32_times (struct tms32 *tbuf)
{
	mm_segment_t old_fs = get_fs();
	struct tms t;
	long ret;
	int err;

	set_fs(KERNEL_DS);
	ret = sys_times(tbuf ? &t : NULL);
	set_fs(old_fs);
	if (tbuf) {
		err = put_user (IA32_TICK(t.tms_utime), &tbuf->tms_utime);
		err |= put_user (IA32_TICK(t.tms_stime), &tbuf->tms_stime);
		err |= put_user (IA32_TICK(t.tms_cutime), &tbuf->tms_cutime);
		err |= put_user (IA32_TICK(t.tms_cstime), &tbuf->tms_cstime);
		if (err)
			ret = -EFAULT;
	}
	return IA32_TICK(ret);
}

static unsigned int
ia32_peek (struct pt_regs *regs, struct task_struct *child, unsigned long addr, unsigned int *val)
{
	size_t copied;
	unsigned int ret;

	copied = access_process_vm(child, addr, val, sizeof(*val), 0);
	return (copied != sizeof(ret)) ? -EIO : 0;
}

static unsigned int
ia32_poke (struct pt_regs *regs, struct task_struct *child, unsigned long addr, unsigned int val)
{

	if (access_process_vm(child, addr, &val, sizeof(val), 1) != sizeof(val))
		return -EIO;
	return 0;
}

/*
 *  The order in which registers are stored in the ptrace regs structure
 */
#define PT_EBX	0
#define PT_ECX	1
#define PT_EDX	2
#define PT_ESI	3
#define PT_EDI	4
#define PT_EBP	5
#define PT_EAX	6
#define PT_DS	7
#define PT_ES	8
#define PT_FS	9
#define PT_GS	10
#define PT_ORIG_EAX 11
#define PT_EIP	12
#define PT_CS	13
#define PT_EFL	14
#define PT_UESP	15
#define PT_SS	16

static unsigned int
getreg (struct task_struct *child, int regno)
{
	struct pt_regs *child_regs;

	child_regs = ia64_task_regs(child);
	switch (regno / sizeof(int)) {
	      case PT_EBX: return child_regs->r11;
	      case PT_ECX: return child_regs->r9;
	      case PT_EDX: return child_regs->r10;
	      case PT_ESI: return child_regs->r14;
	      case PT_EDI: return child_regs->r15;
	      case PT_EBP: return child_regs->r13;
	      case PT_EAX: return child_regs->r8;
	      case PT_ORIG_EAX: return child_regs->r1; /* see dispatch_to_ia32_handler() */
	      case PT_EIP: return child_regs->cr_iip;
	      case PT_UESP: return child_regs->r12;
	      case PT_EFL: return child->thread.eflag;
	      case PT_DS: case PT_ES: case PT_FS: case PT_GS: case PT_SS:
		return __USER_DS;
	      case PT_CS: return __USER_CS;
	      default:
		printk(KERN_ERR "ia32.getreg(): unknown register %d\n", regno);
		break;
	}
	return 0;
}

static void
putreg (struct task_struct *child, int regno, unsigned int value)
{
	struct pt_regs *child_regs;

	child_regs = ia64_task_regs(child);
	switch (regno / sizeof(int)) {
	      case PT_EBX: child_regs->r11 = value; break;
	      case PT_ECX: child_regs->r9 = value; break;
	      case PT_EDX: child_regs->r10 = value; break;
	      case PT_ESI: child_regs->r14 = value; break;
	      case PT_EDI: child_regs->r15 = value; break;
	      case PT_EBP: child_regs->r13 = value; break;
	      case PT_EAX: child_regs->r8 = value; break;
	      case PT_ORIG_EAX: child_regs->r1 = value; break;
	      case PT_EIP: child_regs->cr_iip = value; break;
	      case PT_UESP: child_regs->r12 = value; break;
	      case PT_EFL: child->thread.eflag = value; break;
	      case PT_DS: case PT_ES: case PT_FS: case PT_GS: case PT_SS:
		if (value != __USER_DS)
			printk(KERN_ERR
			       "ia32.putreg: attempt to set invalid segment register %d = %x\n",
			       regno, value);
		break;
	      case PT_CS:
		if (value != __USER_CS)
			printk(KERN_ERR
			       "ia32.putreg: attempt to to set invalid segment register %d = %x\n",
			       regno, value);
		break;
	      default:
		printk(KERN_ERR "ia32.putreg: unknown register %d\n", regno);
		break;
	}
}

static void
put_fpreg (int regno, struct _fpreg_ia32 *reg, struct pt_regs *ptp, struct switch_stack *swp,
	   int tos)
{
	struct _fpreg_ia32 *f;
	char buf[32];

	f = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15);
	if ((regno += tos) >= 8)
		regno -= 8;
	switch (regno) {
	      case 0:
		ia64f2ia32f(f, &ptp->f8);
		break;
	      case 1:
		ia64f2ia32f(f, &ptp->f9);
		break;
	      case 2:
		ia64f2ia32f(f, &ptp->f10);
		break;
	      case 3:
		ia64f2ia32f(f, &ptp->f11);
		break;
	      case 4:
	      case 5:
	      case 6:
	      case 7:
		ia64f2ia32f(f, &swp->f12 + (regno - 4));
		break;
	}
	copy_to_user(reg, f, sizeof(*reg));
}

static void
get_fpreg (int regno, struct _fpreg_ia32 *reg, struct pt_regs *ptp, struct switch_stack *swp,
	   int tos)
{

	if ((regno += tos) >= 8)
		regno -= 8;
	switch (regno) {
	      case 0:
		copy_from_user(&ptp->f8, reg, sizeof(*reg));
		break;
	      case 1:
		copy_from_user(&ptp->f9, reg, sizeof(*reg));
		break;
	      case 2:
		copy_from_user(&ptp->f10, reg, sizeof(*reg));
		break;
	      case 3:
		copy_from_user(&ptp->f11, reg, sizeof(*reg));
		break;
	      case 4:
	      case 5:
	      case 6:
	      case 7:
		copy_from_user(&swp->f12 + (regno - 4), reg, sizeof(*reg));
		break;
	}
	return;
}

int
save_ia32_fpstate (struct task_struct *tsk, struct ia32_user_i387_struct *save)
{
	struct switch_stack *swp;
	struct pt_regs *ptp;
	int i, tos;

	if (!access_ok(VERIFY_WRITE, save, sizeof(*save)))
		return -EFAULT;

	__put_user(tsk->thread.fcr & 0xffff, &save->cwd);
	__put_user(tsk->thread.fsr & 0xffff, &save->swd);
	__put_user((tsk->thread.fsr>>16) & 0xffff, &save->twd);
	__put_user(tsk->thread.fir, &save->fip);
	__put_user((tsk->thread.fir>>32) & 0xffff, &save->fcs);
	__put_user(tsk->thread.fdr, &save->foo);
	__put_user((tsk->thread.fdr>>32) & 0xffff, &save->fos);

	/*
	 *  Stack frames start with 16-bytes of temp space
	 */
	swp = (struct switch_stack *)(tsk->thread.ksp + 16);
	ptp = ia64_task_regs(tsk);
	tos = (tsk->thread.fsr >> 11) & 7;
	for (i = 0; i < 8; i++)
		put_fpreg(i, &save->st_space[i], ptp, swp, tos);
	return 0;
}

static int
restore_ia32_fpstate (struct task_struct *tsk, struct ia32_user_i387_struct *save)
{
	struct switch_stack *swp;
	struct pt_regs *ptp;
	int i, tos;
	unsigned int fsrlo, fsrhi, num32;

	if (!access_ok(VERIFY_READ, save, sizeof(*save)))
		return(-EFAULT);

	__get_user(num32, (unsigned int *)&save->cwd);
	tsk->thread.fcr = (tsk->thread.fcr & (~0x1f3f)) | (num32 & 0x1f3f);
	__get_user(fsrlo, (unsigned int *)&save->swd);
	__get_user(fsrhi, (unsigned int *)&save->twd);
	num32 = (fsrhi << 16) | fsrlo;
	tsk->thread.fsr = (tsk->thread.fsr & (~0xffffffff)) | num32;
	__get_user(num32, (unsigned int *)&save->fip);
	tsk->thread.fir = (tsk->thread.fir & (~0xffffffff)) | num32;
	__get_user(num32, (unsigned int *)&save->foo);
	tsk->thread.fdr = (tsk->thread.fdr & (~0xffffffff)) | num32;

	/*
	 *  Stack frames start with 16-bytes of temp space
	 */
	swp = (struct switch_stack *)(tsk->thread.ksp + 16);
	ptp = ia64_task_regs(tsk);
	tos = (tsk->thread.fsr >> 11) & 7;
	for (i = 0; i < 8; i++)
		get_fpreg(i, &save->st_space[i], ptp, swp, tos);
	return 0;
}

int
save_ia32_fpxstate (struct task_struct *tsk, struct ia32_user_fxsr_struct *save)
{
	struct switch_stack *swp;
	struct pt_regs *ptp;
	int i, tos;
	unsigned long mxcsr=0;
	unsigned long num128[2];

	if (!access_ok(VERIFY_WRITE, save, sizeof(*save)))
		return -EFAULT;

	__put_user(tsk->thread.fcr & 0xffff, &save->cwd);
	__put_user(tsk->thread.fsr & 0xffff, &save->swd);
	__put_user((tsk->thread.fsr>>16) & 0xffff, &save->twd);
	__put_user(tsk->thread.fir, &save->fip);
	__put_user((tsk->thread.fir>>32) & 0xffff, &save->fcs);
	__put_user(tsk->thread.fdr, &save->foo);
	__put_user((tsk->thread.fdr>>32) & 0xffff, &save->fos);

        /*
         *  Stack frames start with 16-bytes of temp space
         */
        swp = (struct switch_stack *)(tsk->thread.ksp + 16);
        ptp = ia64_task_regs(tsk);
	tos = (tsk->thread.fsr >> 11) & 7;
        for (i = 0; i < 8; i++)
		put_fpreg(i, (struct _fpxreg_ia32 *)&save->st_space[4*i], ptp, swp, tos);

	mxcsr = ((tsk->thread.fcr>>32) & 0xff80) | ((tsk->thread.fsr>>32) & 0x3f);
	__put_user(mxcsr & 0xffff, &save->mxcsr);
	for (i = 0; i < 8; i++) {
		memcpy(&(num128[0]), &(swp->f16) + i*2, sizeof(unsigned long));
		memcpy(&(num128[1]), &(swp->f17) + i*2, sizeof(unsigned long));
		copy_to_user(&save->xmm_space[0] + 4*i, num128, sizeof(struct _xmmreg_ia32));
	}
	return 0;
}

static int
restore_ia32_fpxstate (struct task_struct *tsk, struct ia32_user_fxsr_struct *save)
{
	struct switch_stack *swp;
	struct pt_regs *ptp;
	int i, tos;
	unsigned int fsrlo, fsrhi, num32;
	int mxcsr;
	unsigned long num64;
	unsigned long num128[2];

	if (!access_ok(VERIFY_READ, save, sizeof(*save)))
		return(-EFAULT);

	__get_user(num32, (unsigned int *)&save->cwd);
	tsk->thread.fcr = (tsk->thread.fcr & (~0x1f3f)) | (num32 & 0x1f3f);
	__get_user(fsrlo, (unsigned int *)&save->swd);
	__get_user(fsrhi, (unsigned int *)&save->twd);
	num32 = (fsrhi << 16) | fsrlo;
	tsk->thread.fsr = (tsk->thread.fsr & (~0xffffffff)) | num32;
	__get_user(num32, (unsigned int *)&save->fip);
	tsk->thread.fir = (tsk->thread.fir & (~0xffffffff)) | num32;
	__get_user(num32, (unsigned int *)&save->foo);
	tsk->thread.fdr = (tsk->thread.fdr & (~0xffffffff)) | num32;

	/*
	 *  Stack frames start with 16-bytes of temp space
	 */
	swp = (struct switch_stack *)(tsk->thread.ksp + 16);
	ptp = ia64_task_regs(tsk);
	tos = (tsk->thread.fsr >> 11) & 7;
	for (i = 0; i < 8; i++)
	get_fpreg(i, (struct _fpxreg_ia32 *)&save->st_space[4*i], ptp, swp, tos);

	__get_user(mxcsr, (unsigned int *)&save->mxcsr);
	num64 = mxcsr & 0xff10;
	tsk->thread.fcr = (tsk->thread.fcr & (~0xff1000000000)) | (num64<<32);
	num64 = mxcsr & 0x3f;
	tsk->thread.fsr = (tsk->thread.fsr & (~0x3f00000000)) | (num64<<32);

	for (i = 0; i < 8; i++) {
		copy_from_user(num128, &save->xmm_space[0] + 4*i, sizeof(struct _xmmreg_ia32));
		memcpy(&(swp->f16) + i*2, &(num128[0]), sizeof(unsigned long));
		memcpy(&(swp->f17) + i*2, &(num128[1]), sizeof(unsigned long));
	}
	return 0;
}

extern asmlinkage long sys_ptrace (long, pid_t, unsigned long, unsigned long, long, long, long,
				   long, long);

/*
 *  Note that the IA32 version of `ptrace' calls the IA64 routine for
 *    many of the requests.  This will only work for requests that do
 *    not need access to the calling processes `pt_regs' which is located
 *    at the address of `stack'.  Once we call the IA64 `sys_ptrace' then
 *    the address of `stack' will not be the address of the `pt_regs'.
 */
asmlinkage long
sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data,
	      long arg4, long arg5, long arg6, long arg7, long stack)
{
	struct pt_regs *regs = (struct pt_regs *) &stack;
	struct task_struct *child;
	unsigned int value, tmp;
	long i, ret;

	lock_kernel();
	if (request == PTRACE_TRACEME) {
		ret = sys_ptrace(request, pid, addr, data, arg4, arg5, arg6, arg7, stack);
		goto out;
	}

	ret = -ESRCH;
	read_lock(&tasklist_lock);
	child = find_task_by_pid(pid);
	if (child)
		get_task_struct(child);
	read_unlock(&tasklist_lock);
	if (!child)
		goto out;
	ret = -EPERM;
	if (pid == 1)		/* no messing around with init! */
		goto out_tsk;

	if (request == PTRACE_ATTACH) {
		ret = sys_ptrace(request, pid, addr, data, arg4, arg5, arg6, arg7, stack);
		goto out_tsk;
	}

	ret = ptrace_check_attach(child, request == PTRACE_KILL);
	if (ret < 0)
		goto out_tsk;

	switch (request) {
	      case PTRACE_PEEKTEXT:
	      case PTRACE_PEEKDATA:	/* read word at location addr */
		ret = ia32_peek(regs, child, addr, &value);
		if (ret == 0)
			ret = put_user(value, (unsigned int *) A(data));
		else
			ret = -EIO;
		goto out_tsk;

	      case PTRACE_POKETEXT:
	      case PTRACE_POKEDATA:	/* write the word at location addr */
		ret = ia32_poke(regs, child, addr, data);
		goto out_tsk;

	      case PTRACE_PEEKUSR:	/* read word at addr in USER area */
		ret = -EIO;
		if ((addr & 3) || addr > 17*sizeof(int))
			break;

		tmp = getreg(child, addr);
		if (!put_user(tmp, (unsigned int *) A(data)))
			ret = 0;
		break;

	      case PTRACE_POKEUSR:	/* write word at addr in USER area */
		ret = -EIO;
		if ((addr & 3) || addr > 17*sizeof(int))
			break;

		putreg(child, addr, data);
		ret = 0;
		break;

	      case IA32_PTRACE_GETREGS:
		if (!access_ok(VERIFY_WRITE, (int *) A(data), 17*sizeof(int))) {
			ret = -EIO;
			break;
		}
		for (i = 0; i < 17*sizeof(int); i += sizeof(int) ) {
			put_user(getreg(child, i), (unsigned int *) A(data));
			data += sizeof(int);
		}
		ret = 0;
		break;

	      case IA32_PTRACE_SETREGS:
		if (!access_ok(VERIFY_READ, (int *) A(data), 17*sizeof(int))) {
			ret = -EIO;
			break;
		}
		for (i = 0; i < 17*sizeof(int); i += sizeof(int) ) {
			get_user(tmp, (unsigned int *) A(data));
			putreg(child, i, tmp);
			data += sizeof(int);
		}
		ret = 0;
		break;

	      case IA32_PTRACE_GETFPREGS:
		ret = save_ia32_fpstate(child, (struct ia32_user_i387_struct *) A(data));
		break;

	      case IA32_PTRACE_GETFPXREGS:
		ret = save_ia32_fpxstate(child, (struct ia32_user_fxsr_struct *) A(data));
		break;

	      case IA32_PTRACE_SETFPREGS:
		ret = restore_ia32_fpstate(child, (struct ia32_user_i387_struct *) A(data));
		break;

	      case IA32_PTRACE_SETFPXREGS:
		ret = restore_ia32_fpxstate(child, (struct ia32_user_fxsr_struct *) A(data));
		break;

	      case PTRACE_SYSCALL:	/* continue, stop after next syscall */
	      case PTRACE_CONT:		/* restart after signal. */
	      case PTRACE_KILL:
	      case PTRACE_SINGLESTEP:	/* execute chile for one instruction */
	      case PTRACE_DETACH:	/* detach a process */
		ret = sys_ptrace(request, pid, addr, data, arg4, arg5, arg6, arg7, stack);
		break;

	      default:
		ret = -EIO;
		break;

	}
  out_tsk:
	free_task_struct(child);
  out:
	unlock_kernel();
	return ret;
}

static inline int
get_flock32(struct flock *kfl, struct flock32 *ufl)
{
	int err;

	if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)))
		return -EFAULT;

	err = __get_user(kfl->l_type, &ufl->l_type);
	err |= __get_user(kfl->l_whence, &ufl->l_whence);
	err |= __get_user(kfl->l_start, &ufl->l_start);
	err |= __get_user(kfl->l_len, &ufl->l_len);
	err |= __get_user(kfl->l_pid, &ufl->l_pid);
	return err;
}

static inline int
put_flock32(struct flock *kfl, struct flock32 *ufl)
{
	int err;

	if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)))
		return -EFAULT;

	err = __put_user(kfl->l_type, &ufl->l_type);
	err |= __put_user(kfl->l_whence, &ufl->l_whence);
	err |= __put_user(kfl->l_start, &ufl->l_start);
	err |= __put_user(kfl->l_len, &ufl->l_len);
	err |= __put_user(kfl->l_pid, &ufl->l_pid);
	return err;
}

extern asmlinkage long sys_fcntl (unsigned int fd, unsigned int cmd, unsigned long arg);

asmlinkage long
sys32_fcntl (unsigned int fd, unsigned int cmd, unsigned int arg)
{
	mm_segment_t old_fs;
	struct flock f;
	long ret;

	switch (cmd) {
	      case F_GETLK:
	      case F_SETLK:
	      case F_SETLKW:
		if (get_flock32(&f, (struct flock32 *) A(arg)))
			return -EFAULT;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		ret = sys_fcntl(fd, cmd, (unsigned long) &f);
		set_fs(old_fs);
		if (cmd == F_GETLK && put_flock32(&f, (struct flock32 *) A(arg)))
			return -EFAULT;
		return ret;

	      default:
		/*
		 *  `sys_fcntl' lies about arg, for the F_SETOWN
		 *  sub-function arg can have a negative value.
		 */
		return sys_fcntl(fd, cmd, arg);
	}
}

asmlinkage long sys_ni_syscall(void);

asmlinkage long
sys32_ni_syscall (int dummy0, int dummy1, int dummy2, int dummy3, int dummy4, int dummy5,
		  int dummy6, int dummy7, int stack)
{
	struct pt_regs *regs = (struct pt_regs *)&stack;

	printk(KERN_WARNING "IA32 syscall #%d issued, maybe we should implement it\n",
	       (int)regs->r1);
	return(sys_ni_syscall());
}

/*
 *  The IA64 maps 4 I/O ports for each 4K page
 */
#define IOLEN	((65536 / 4) * 4096)

asmlinkage long
sys32_iopl (int level)
{
	extern unsigned long ia64_iobase;
	int fd;
	struct file * file;
	unsigned int old;
	unsigned long addr;
	mm_segment_t old_fs = get_fs ();

	if (level != 3)
		return(-EINVAL);
	/* Trying to gain more privileges? */
	asm volatile ("mov %0=ar.eflag ;;" : "=r"(old));
	if (level > ((old >> 12) & 3)) {
		if (!capable(CAP_SYS_RAWIO))
			return -EPERM;
	}
	set_fs(KERNEL_DS);
	fd = sys_open("/dev/mem", O_SYNC | O_RDWR, 0);
	set_fs(old_fs);
	if (fd < 0)
		return fd;
	file = fget(fd);
	if (file == NULL) {
		sys_close(fd);
		return(-EFAULT);
	}

	down_write(&current->mm->mmap_sem);
	addr = do_mmap_pgoff(file, IA32_IOBASE,
			     IOLEN, PROT_READ|PROT_WRITE, MAP_SHARED,
			     (ia64_iobase & ~PAGE_OFFSET) >> PAGE_SHIFT);
	up_write(&current->mm->mmap_sem);

	if (addr >= 0) {
		old = (old & ~0x3000) | (level << 12);
		asm volatile ("mov ar.eflag=%0;;" :: "r"(old));
	}

	fput(file);
	sys_close(fd);
	return 0;
}

asmlinkage long
sys32_ioperm (unsigned int from, unsigned int num, int on)
{

	/*
	 *  Since IA64 doesn't have permission bits we'd have to go to
	 *    a lot of trouble to simulate them in software.  There's
	 *    no point, only trusted programs can make this call so we'll
	 *    just turn it into an iopl call and let the process have
	 *    access to all I/O ports.
	 *
	 * XXX proper ioperm() support should be emulated by
	 *	manipulating the page protections...
	 */
	return sys32_iopl(3);
}

typedef struct {
	unsigned int	ss_sp;
	unsigned int	ss_flags;
	unsigned int	ss_size;
} ia32_stack_t;

asmlinkage long
sys32_sigaltstack (ia32_stack_t *uss32, ia32_stack_t *uoss32,
		   long arg2, long arg3, long arg4, long arg5, long arg6, long arg7, long stack)
{
	struct pt_regs *pt = (struct pt_regs *) &stack;
	stack_t uss, uoss;
	ia32_stack_t buf32;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (uss32)
		if (copy_from_user(&buf32, uss32, sizeof(ia32_stack_t)))
			return -EFAULT;
	uss.ss_sp = (void *) (long) buf32.ss_sp;
	uss.ss_flags = buf32.ss_flags;
	/* MINSIGSTKSZ is different for ia32 vs ia64. We lie here to pass the
           check and set it to the user requested value later */
	if ((buf32.ss_flags != SS_DISABLE) && (buf32.ss_size < MINSIGSTKSZ_IA32)) {
		ret = -ENOMEM;
		goto out;
	}
	uss.ss_size = MINSIGSTKSZ;
	set_fs(KERNEL_DS);
	ret = do_sigaltstack(uss32 ? &uss : NULL, &uoss, pt->r12);
 	current->sas_ss_size = buf32.ss_size;
	set_fs(old_fs);
out:
	if (ret < 0)
		return(ret);
	if (uoss32) {
		buf32.ss_sp = (long) uoss.ss_sp;
		buf32.ss_flags = uoss.ss_flags;
		buf32.ss_size = uoss.ss_size;
		if (copy_to_user(uoss32, &buf32, sizeof(ia32_stack_t)))
			return -EFAULT;
	}
	return ret;
}

asmlinkage int
sys32_pause (void)
{
	current->state = TASK_INTERRUPTIBLE;
	schedule();
	return -ERESTARTNOHAND;
}

asmlinkage long sys_msync (unsigned long start, size_t len, int flags);

asmlinkage int
sys32_msync (unsigned int start, unsigned int len, int flags)
{
	unsigned int addr;

	if (OFFSET4K(start))
		return -EINVAL;
	addr = PAGE_START(start);
	return sys_msync(addr, len + (start - addr), flags);
}

struct sysctl32 {
	unsigned int	name;
	int		nlen;
	unsigned int	oldval;
	unsigned int	oldlenp;
	unsigned int	newval;
	unsigned int	newlen;
	unsigned int	__unused[4];
};

extern asmlinkage long sys_sysctl(struct __sysctl_args *args);

asmlinkage long
sys32_sysctl (struct sysctl32 *args)
{
#ifdef CONFIG_SYSCTL
	struct sysctl32 a32;
	mm_segment_t old_fs = get_fs ();
	void *oldvalp, *newvalp;
	size_t oldlen;
	int *namep;
	long ret;

	if (copy_from_user(&a32, args, sizeof(a32)))
		return -EFAULT;

	/*
	 * We need to pre-validate these because we have to disable address checking
	 * before calling do_sysctl() because of OLDLEN but we can't run the risk of the
	 * user specifying bad addresses here.  Well, since we're dealing with 32 bit
	 * addresses, we KNOW that access_ok() will always succeed, so this is an
	 * expensive NOP, but so what...
	 */
	namep = (int *) A(a32.name);
	oldvalp = (void *) A(a32.oldval);
	newvalp = (void *) A(a32.newval);

	if ((oldvalp && get_user(oldlen, (int *) A(a32.oldlenp)))
	    || !access_ok(VERIFY_WRITE, namep, 0)
	    || !access_ok(VERIFY_WRITE, oldvalp, 0)
	    || !access_ok(VERIFY_WRITE, newvalp, 0))
		return -EFAULT;

	set_fs(KERNEL_DS);
	lock_kernel();
	ret = do_sysctl(namep, a32.nlen, oldvalp, &oldlen, newvalp, (size_t) a32.newlen);
	unlock_kernel();
	set_fs(old_fs);

	if (oldvalp && put_user (oldlen, (int *) A(a32.oldlenp)))
		return -EFAULT;

	return ret;
#else
	return -ENOSYS;
#endif
}

asmlinkage long
sys32_newuname (struct new_utsname *name)
{
	extern asmlinkage long sys_newuname(struct new_utsname * name);
	int ret = sys_newuname(name);

	if (!ret)
		if (copy_to_user(name->machine, "i686\0\0\0", 8))
			ret = -EFAULT;
	return ret;
}

extern asmlinkage long sys_getresuid (uid_t *ruid, uid_t *euid, uid_t *suid);

asmlinkage long
sys32_getresuid16 (u16 *ruid, u16 *euid, u16 *suid)
{
	uid_t a, b, c;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_getresuid(&a, &b, &c);
	set_fs(old_fs);

	if (put_user(a, ruid) || put_user(b, euid) || put_user(c, suid))
		return -EFAULT;
	return ret;
}

extern asmlinkage long sys_getresgid (gid_t *rgid, gid_t *egid, gid_t *sgid);

asmlinkage long
sys32_getresgid16 (u16 *rgid, u16 *egid, u16 *sgid)
{
	gid_t a, b, c;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_getresgid(&a, &b, &c);
	set_fs(old_fs);

	if (ret)
		return ret;

	return put_user(a, rgid) | put_user(b, egid) | put_user(c, sgid);
}

asmlinkage long
sys32_lseek (unsigned int fd, int offset, unsigned int whence)
{
	extern off_t sys_lseek (unsigned int fd, off_t offset, unsigned int origin);

	/* Sign-extension of "offset" is important here... */
	return sys_lseek(fd, offset, whence);
}

extern asmlinkage long sys_getgroups (int gidsetsize, gid_t *grouplist);

asmlinkage long
sys32_getgroups16 (int gidsetsize, short *grouplist)
{
	mm_segment_t old_fs = get_fs();
	gid_t gl[NGROUPS];
	int ret, i;

	set_fs(KERNEL_DS);
	ret = sys_getgroups(gidsetsize, gl);
	set_fs(old_fs);

	if (gidsetsize && ret > 0 && ret <= NGROUPS)
		for (i = 0; i < ret; i++, grouplist++)
			if (put_user(gl[i], grouplist))
				return -EFAULT;
	return ret;
}

extern asmlinkage long sys_setgroups (int gidsetsize, gid_t *grouplist);

asmlinkage long
sys32_setgroups16 (int gidsetsize, short *grouplist)
{
	mm_segment_t old_fs = get_fs();
	gid_t gl[NGROUPS];
	int ret, i;

	if ((unsigned) gidsetsize > NGROUPS)
		return -EINVAL;
	for (i = 0; i < gidsetsize; i++, grouplist++)
		if (get_user(gl[i], grouplist))
			return -EFAULT;
	set_fs(KERNEL_DS);
	ret = sys_setgroups(gidsetsize, gl);
	set_fs(old_fs);
	return ret;
}

/*
 * Unfortunately, the x86 compiler aligns variables of type "long long" to a 4 byte boundary
 * only, which means that the x86 version of "struct flock64" doesn't match the ia64 version
 * of struct flock.
 */

static inline long
ia32_put_flock (struct flock *l, unsigned long addr)
{
	return (put_user(l->l_type, (short *) addr)
		| put_user(l->l_whence, (short *) (addr + 2))
		| put_user(l->l_start, (long *) (addr + 4))
		| put_user(l->l_len, (long *) (addr + 12))
		| put_user(l->l_pid, (int *) (addr + 20)));
}

static inline long
ia32_get_flock (struct flock *l, unsigned long addr)
{
	unsigned int start_lo, start_hi, len_lo, len_hi;
	int err = (get_user(l->l_type, (short *) addr)
		   | get_user(l->l_whence, (short *) (addr + 2))
		   | get_user(start_lo, (int *) (addr + 4))
		   | get_user(start_hi, (int *) (addr + 8))
		   | get_user(len_lo, (int *) (addr + 12))
		   | get_user(len_hi, (int *) (addr + 16))
		   | get_user(l->l_pid, (int *) (addr + 20)));
	l->l_start = ((unsigned long) start_hi << 32) | start_lo;
	l->l_len = ((unsigned long) len_hi << 32) | len_lo;
	return err;
}

asmlinkage long
sys32_fcntl64 (unsigned int fd, unsigned int cmd, unsigned int arg)
{
	mm_segment_t old_fs;
	struct flock f;
	long ret;

	switch (cmd) {
	      case F_GETLK64:
	      case F_SETLK64:
	      case F_SETLKW64:
		if (ia32_get_flock(&f, arg))
			return -EFAULT;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
			((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
			(unsigned long) &f);
		set_fs(old_fs);
		if (cmd == F_GETLK64 && ia32_put_flock(&f, arg))
			return -EFAULT;
		break;

	      default:
		ret = sys32_fcntl(fd, cmd, arg);
		break;
	}
	return ret;
}

asmlinkage long
sys32_truncate64 (unsigned int path, unsigned int len_lo, unsigned int len_hi)
{
	extern asmlinkage long sys_truncate (const char *path, unsigned long length);

	return sys_truncate((const char *) A(path), ((unsigned long) len_hi << 32) | len_lo);
}

asmlinkage long
sys32_ftruncate64 (int fd, unsigned int len_lo, unsigned int len_hi)
{
	extern asmlinkage long sys_ftruncate (int fd, unsigned long length);

	return sys_ftruncate(fd, ((unsigned long) len_hi << 32) | len_lo);
}

static int
putstat64 (struct stat64 *ubuf, struct stat *kbuf)
{
	int err;

	if (clear_user(ubuf, sizeof(*ubuf)))
		return 1;

	err  = __put_user(kbuf->st_dev, &ubuf->st_dev);
	err |= __put_user(kbuf->st_ino, &ubuf->__st_ino);
	err |= __put_user(kbuf->st_ino, &ubuf->st_ino_lo);
	err |= __put_user(kbuf->st_ino >> 32, &ubuf->st_ino_hi);
	err |= __put_user(kbuf->st_mode, &ubuf->st_mode);
	err |= __put_user(kbuf->st_nlink, &ubuf->st_nlink);
	err |= __put_user(kbuf->st_uid, &ubuf->st_uid);
	err |= __put_user(kbuf->st_gid, &ubuf->st_gid);
	err |= __put_user(kbuf->st_rdev, &ubuf->st_rdev);
	err |= __put_user(kbuf->st_size, &ubuf->st_size_lo);
	err |= __put_user((kbuf->st_size >> 32), &ubuf->st_size_hi);
	err |= __put_user(kbuf->st_atime, &ubuf->st_atime);
	err |= __put_user(kbuf->st_mtime, &ubuf->st_mtime);
	err |= __put_user(kbuf->st_ctime, &ubuf->st_ctime);
	err |= __put_user(kbuf->st_blksize, &ubuf->st_blksize);
	err |= __put_user(kbuf->st_blocks, &ubuf->st_blocks);
	return err;
}

asmlinkage long
sys32_stat64 (char *filename, struct stat64 *statbuf)
{
	char *name;
	mm_segment_t old_fs = get_fs();
	struct stat s;
	long ret;

	name = getname(filename);
	if (IS_ERR(name))
		return PTR_ERR(name);
	set_fs(KERNEL_DS);
	ret = sys_newstat(name, &s);
	set_fs(old_fs);
	putname(name);
	if (putstat64(statbuf, &s))
		return -EFAULT;
	return ret;
}

asmlinkage long
sys32_lstat64 (char *filename, struct stat64 *statbuf)
{
	char *name;
	mm_segment_t old_fs = get_fs();
	struct stat s;
	long ret;

	name = getname(filename);
	if (IS_ERR(name))
		return PTR_ERR(name);
	set_fs(KERNEL_DS);
	ret = sys_newlstat(name, &s);
	set_fs(old_fs);
	putname(name);
	if (putstat64(statbuf, &s))
		return -EFAULT;
	return ret;
}

asmlinkage long
sys32_fstat64 (unsigned int fd, struct stat64 *statbuf)
{
	mm_segment_t old_fs = get_fs();
	struct stat s;
	long ret;

	set_fs(KERNEL_DS);
	ret = sys_newfstat(fd, &s);
	set_fs(old_fs);
	if (putstat64(statbuf, &s))
		return -EFAULT;
	return ret;
}

asmlinkage long
sys32_sigpending (unsigned int *set)
{
	return do_sigpending(set, sizeof(*set));
}

struct sysinfo32 {
	s32 uptime;
	u32 loads[3];
	u32 totalram;
	u32 freeram;
	u32 sharedram;
	u32 bufferram;
	u32 totalswap;
	u32 freeswap;
	u16 procs;
	u16 pad;
	u32 totalhigh;
	u32 freehigh;
	u32 mem_unit;
	char _f[8];
};

asmlinkage long
sys32_sysinfo (struct sysinfo32 *info)
{
	extern asmlinkage long sys_sysinfo (struct sysinfo *);
	struct sysinfo s;
	long ret, err;
	int bitcount = 0;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_sysinfo(&s);
	set_fs(old_fs);
	/* Check to see if any memory value is too large for 32-bit and
	 * scale down if needed.
	 */
	if ((s.totalram >> 32) || (s.totalswap >> 32)) {
		while (s.mem_unit < PAGE_SIZE) {
			s.mem_unit <<= 1;
			bitcount++;
		}
		s.totalram >>= bitcount;
		s.freeram >>= bitcount;
		s.sharedram >>= bitcount;
		s.bufferram >>= bitcount;
		s.totalswap >>= bitcount;
		s.freeswap >>= bitcount;
		s.totalhigh >>= bitcount;
		s.freehigh >>= bitcount;
	}

	if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
		return -EFAULT;

	err  = __put_user(s.uptime, &info->uptime);
	err |= __put_user(s.loads[0], &info->loads[0]);
	err |= __put_user(s.loads[1], &info->loads[1]);
	err |= __put_user(s.loads[2], &info->loads[2]);
	err |= __put_user(s.totalram, &info->totalram);
	err |= __put_user(s.freeram, &info->freeram);
	err |= __put_user(s.sharedram, &info->sharedram);
	err |= __put_user(s.bufferram, &info->bufferram);
	err |= __put_user(s.totalswap, &info->totalswap);
	err |= __put_user(s.freeswap, &info->freeswap);
	err |= __put_user(s.procs, &info->procs);
	err |= __put_user(s.totalhigh, &info->totalhigh);
	err |= __put_user(s.freehigh, &info->freehigh);
	err |= __put_user(s.mem_unit, &info->mem_unit);
	if (err)
		return -EFAULT;
	return ret;
}

/* In order to reduce some races, while at the same time doing additional
 * checking and hopefully speeding things up, we copy filenames to the
 * kernel data space before using them..
 *
 * POSIX.1 2.4: an empty pathname is invalid (ENOENT).
 */
static inline int
do_getname32 (const char *filename, char *page)
{
	int retval;

	/* 32bit pointer will be always far below TASK_SIZE :)) */
	retval = strncpy_from_user((char *)page, (char *)filename, PAGE_SIZE);
	if (retval > 0) {
		if (retval < PAGE_SIZE)
			return 0;
		return -ENAMETOOLONG;
	} else if (!retval)
		retval = -ENOENT;
	return retval;
}

static char *
getname32 (const char *filename)
{
	char *tmp, *result;

	result = ERR_PTR(-ENOMEM);
	tmp = (char *)__get_free_page(GFP_KERNEL);
	if (tmp)  {
		int retval = do_getname32(filename, tmp);

		result = tmp;
		if (retval < 0) {
			putname(tmp);
			result = ERR_PTR(retval);
		}
	}
	return result;
}

struct user_dqblk32 {
	__u32 dqb_bhardlimit;
	__u32 dqb_bsoftlimit;
	__u32 dqb_curblocks;
	__u32 dqb_ihardlimit;
	__u32 dqb_isoftlimit;
	__u32 dqb_curinodes;
	__kernel_time_t32 dqb_btime;
	__kernel_time_t32 dqb_itime;
};

asmlinkage long
sys32_quotactl(int cmd, unsigned int special, int id, caddr_t addr)
{
	extern asmlinkage long sys_quotactl (int, const char *, int, caddr_t);
	int cmds = cmd >> SUBCMDSHIFT;
	mm_segment_t old_fs;
	struct v1c_mem_dqblk d;
	char *spec;
	long err;

	switch (cmds) {
	case Q_V1_GETQUOTA:
		break;
	case Q_V1_SETQUOTA:
	case Q_V1_SETUSE:
	case Q_V1_SETQLIM:
		if (copy_from_user(&d, addr, sizeof(struct user_dqblk32)))
			return -EFAULT;
		d.dqb_itime = ((struct user_dqblk32 *)&d)->dqb_itime;
		d.dqb_btime = ((struct user_dqblk32 *)&d)->dqb_btime;
		break;
	default:
		return sys_quotactl(cmd, (void *)A(special), id, addr);
	}
	spec = getname32((void *) A(special));
	err = PTR_ERR(spec);
	if (IS_ERR(spec))
		return err;
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_quotactl(cmd, (const char *)spec, id, (caddr_t)&d);
	set_fs(old_fs);
	putname(spec);
	if (cmds == Q_V1_GETQUOTA) {
		__kernel_time_t b = d.dqb_btime, i = d.dqb_itime;
		((struct user_dqblk32 *)&d)->dqb_itime = i;
		((struct user_dqblk32 *)&d)->dqb_btime = b;
		if (copy_to_user(addr, &d, sizeof(struct user_dqblk32)))
			return -EFAULT;
	}
	return err;
}

asmlinkage long
sys32_sched_rr_get_interval (pid_t pid, struct timespec32 *interval)
{
	extern asmlinkage long sys_sched_rr_get_interval (pid_t, struct timespec *);
	mm_segment_t old_fs = get_fs();
	struct timespec t;
	long ret;

	set_fs(KERNEL_DS);
	ret = sys_sched_rr_get_interval(pid, &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;
}

asmlinkage long
sys32_pread (unsigned int fd, void *buf, unsigned int count, u32 pos_lo, u32 pos_hi)
{
	extern asmlinkage long sys_pread (unsigned int, char *, size_t, loff_t);
	return sys_pread(fd, buf, count, ((unsigned long) pos_hi << 32) | pos_lo);
}

asmlinkage long
sys32_pwrite (unsigned int fd, void *buf, unsigned int count, u32 pos_lo, u32 pos_hi)
{
	extern asmlinkage long sys_pwrite (unsigned int, const char *, size_t, loff_t);
	return sys_pwrite(fd, buf, count, ((unsigned long) pos_hi << 32) | pos_lo);
}

asmlinkage long
sys32_sendfile (int out_fd, int in_fd, int *offset, unsigned int count)
{
	extern asmlinkage long sys_sendfile (int, int, off_t *, size_t);
	mm_segment_t old_fs = get_fs();
	long ret;
	off_t of;

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

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

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

	return ret;
}

asmlinkage long
sys32_personality (unsigned int personality)
{
	extern asmlinkage long sys_personality (unsigned long);
	long ret;

	if (current->personality == PER_LINUX32 && personality == PER_LINUX)
		personality = PER_LINUX32;
	ret = sys_personality(personality);
	if (ret == PER_LINUX32)
		ret = PER_LINUX;
	return ret;
}

asmlinkage unsigned long
sys32_brk (unsigned int brk)
{
	unsigned long ret, obrk;
	struct mm_struct *mm = current->mm;

	obrk = mm->brk;
	ret = sys_brk(brk);
	if (ret < obrk)
		clear_user((void *) ret, PAGE_ALIGN(ret) - ret);
	return ret;
}

/*
 * Exactly like fs/open.c:sys_open(), except that it doesn't set the O_LARGEFILE flag.
 */
asmlinkage long
sys32_open (const char * filename, int flags, int mode)
{
	char * tmp;
	int fd, error;

	tmp = getname(filename);
	fd = PTR_ERR(tmp);
	if (!IS_ERR(tmp)) {
		fd = get_unused_fd();
		if (fd >= 0) {
			struct file *f = filp_open(tmp, flags, mode);
			error = PTR_ERR(f);
			if (IS_ERR(f))
				goto out_error;
			fd_install(fd, f);
		}
out:
		putname(tmp);
	}
	return fd;

out_error:
	put_unused_fd(fd);
	fd = error;
	goto out;
}

#ifdef	NOTYET  /* UNTESTED FOR IA64 FROM HERE DOWN */

struct ncp_mount_data32 {
	int version;
	unsigned int ncp_fd;
	__kernel_uid_t32 mounted_uid;
	int wdog_pid;
	unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
	unsigned int time_out;
	unsigned int retry_count;
	unsigned int flags;
	__kernel_uid_t32 uid;
	__kernel_gid_t32 gid;
	__kernel_mode_t32 file_mode;
	__kernel_mode_t32 dir_mode;
};

static void *
do_ncp_super_data_conv(void *raw_data)
{
	struct ncp_mount_data *n = (struct ncp_mount_data *)raw_data;
	struct ncp_mount_data32 *n32 = (struct ncp_mount_data32 *)raw_data;

	n->dir_mode = n32->dir_mode;
	n->file_mode = n32->file_mode;
	n->gid = n32->gid;
	n->uid = n32->uid;
	memmove (n->mounted_vol, n32->mounted_vol,
		 (sizeof (n32->mounted_vol) + 3 * sizeof (unsigned int)));
	n->wdog_pid = n32->wdog_pid;
	n->mounted_uid = n32->mounted_uid;
	return raw_data;
}

struct smb_mount_data32 {
	int version;
	__kernel_uid_t32 mounted_uid;
	__kernel_uid_t32 uid;
	__kernel_gid_t32 gid;
	__kernel_mode_t32 file_mode;
	__kernel_mode_t32 dir_mode;
};

static void *
do_smb_super_data_conv(void *raw_data)
{
	struct smb_mount_data *s = (struct smb_mount_data *)raw_data;
	struct smb_mount_data32 *s32 = (struct smb_mount_data32 *)raw_data;

	s->version = s32->version;
	s->mounted_uid = s32->mounted_uid;
	s->uid = s32->uid;
	s->gid = s32->gid;
	s->file_mode = s32->file_mode;
	s->dir_mode = s32->dir_mode;
	return raw_data;
}

static int
copy_mount_stuff_to_kernel(const void *user, unsigned long *kernel)
{
	int i;
	unsigned long page;
	struct vm_area_struct *vma;

	*kernel = 0;
	if(!user)
		return 0;
	vma = find_vma(current->mm, (unsigned long)user);
	if(!vma || (unsigned long)user < vma->vm_start)
		return -EFAULT;
	if(!(vma->vm_flags & VM_READ))
		return -EFAULT;
	i = vma->vm_end - (unsigned long) user;
	if(PAGE_SIZE <= (unsigned long) i)
		i = PAGE_SIZE - 1;
	if(!(page = __get_free_page(GFP_KERNEL)))
		return -ENOMEM;
	if(copy_from_user((void *) page, user, i)) {
		free_page(page);
		return -EFAULT;
	}
	*kernel = page;
	return 0;
}

extern asmlinkage long sys_mount(char * dev_name, char * dir_name, char * type,
				unsigned long new_flags, void *data);

#define SMBFS_NAME	"smbfs"
#define NCPFS_NAME	"ncpfs"

asmlinkage long
sys32_mount(char *dev_name, char *dir_name, char *type,
	    unsigned long new_flags, u32 data)
{
	unsigned long type_page;
	int err, is_smb, is_ncp;

	if(!capable(CAP_SYS_ADMIN))
		return -EPERM;
	is_smb = is_ncp = 0;
	err = copy_mount_stuff_to_kernel((const void *)type, &type_page);
	if(err)
		return err;
	if(type_page) {
		is_smb = !strcmp((char *)type_page, SMBFS_NAME);
		is_ncp = !strcmp((char *)type_page, NCPFS_NAME);
	}
	if(!is_smb && !is_ncp) {
		if(type_page)
			free_page(type_page);
		return sys_mount(dev_name, dir_name, type, new_flags,
				 (void *)AA(data));
	} else {
		unsigned long dev_page, dir_page, data_page;

		err = copy_mount_stuff_to_kernel((const void *)dev_name,
						 &dev_page);
		if(err)
			goto out;
		err = copy_mount_stuff_to_kernel((const void *)dir_name,
						 &dir_page);
		if(err)
			goto dev_out;
		err = copy_mount_stuff_to_kernel((const void *)AA(data),
						 &data_page);
		if(err)
			goto dir_out;
		if(is_ncp)
			do_ncp_super_data_conv((void *)data_page);
		else if(is_smb)
			do_smb_super_data_conv((void *)data_page);
		else
			panic("The problem is here...");
		err = do_mount((char *)dev_page, (char *)dir_page,
				(char *)type_page, new_flags,
				(void *)data_page);
		if(data_page)
			free_page(data_page);
	dir_out:
		if(dir_page)
			free_page(dir_page);
	dev_out:
		if(dev_page)
			free_page(dev_page);
	out:
		if(type_page)
			free_page(type_page);
		return err;
	}
}

extern asmlinkage long sys_setreuid(uid_t ruid, uid_t euid);

asmlinkage long sys32_setreuid(__kernel_uid_t32 ruid, __kernel_uid_t32 euid)
{
	uid_t sruid, seuid;

	sruid = (ruid == (__kernel_uid_t32)-1) ? ((uid_t)-1) : ((uid_t)ruid);
	seuid = (euid == (__kernel_uid_t32)-1) ? ((uid_t)-1) : ((uid_t)euid);
	return sys_setreuid(sruid, seuid);
}

extern asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid);

asmlinkage long
sys32_setresuid(__kernel_uid_t32 ruid, __kernel_uid_t32 euid,
		__kernel_uid_t32 suid)
{
	uid_t sruid, seuid, ssuid;

	sruid = (ruid == (__kernel_uid_t32)-1) ? ((uid_t)-1) : ((uid_t)ruid);
	seuid = (euid == (__kernel_uid_t32)-1) ? ((uid_t)-1) : ((uid_t)euid);
	ssuid = (suid == (__kernel_uid_t32)-1) ? ((uid_t)-1) : ((uid_t)suid);
	return sys_setresuid(sruid, seuid, ssuid);
}

extern asmlinkage long sys_setregid(gid_t rgid, gid_t egid);

asmlinkage long
sys32_setregid(__kernel_gid_t32 rgid, __kernel_gid_t32 egid)
{
	gid_t srgid, segid;

	srgid = (rgid == (__kernel_gid_t32)-1) ? ((gid_t)-1) : ((gid_t)rgid);
	segid = (egid == (__kernel_gid_t32)-1) ? ((gid_t)-1) : ((gid_t)egid);
	return sys_setregid(srgid, segid);
}

extern asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid);

asmlinkage long
sys32_setresgid(__kernel_gid_t32 rgid, __kernel_gid_t32 egid,
		__kernel_gid_t32 sgid)
{
	gid_t srgid, segid, ssgid;

	srgid = (rgid == (__kernel_gid_t32)-1) ? ((gid_t)-1) : ((gid_t)rgid);
	segid = (egid == (__kernel_gid_t32)-1) ? ((gid_t)-1) : ((gid_t)egid);
	ssgid = (sgid == (__kernel_gid_t32)-1) ? ((gid_t)-1) : ((gid_t)sgid);
	return sys_setresgid(srgid, segid, ssgid);
}

/* Stuff for NFS server syscalls... */
struct nfsctl_svc32 {
	u16			svc32_port;
	s32			svc32_nthreads;
};

struct nfsctl_client32 {
	s8			cl32_ident[NFSCLNT_IDMAX+1];
	s32			cl32_naddr;
	struct in_addr		cl32_addrlist[NFSCLNT_ADDRMAX];
	s32			cl32_fhkeytype;
	s32			cl32_fhkeylen;
	u8			cl32_fhkey[NFSCLNT_KEYMAX];
};

struct nfsctl_export32 {
	s8			ex32_client[NFSCLNT_IDMAX+1];
	s8			ex32_path[NFS_MAXPATHLEN+1];
	__kernel_dev_t32	ex32_dev;
	__kernel_ino_t32	ex32_ino;
	s32			ex32_flags;
	__kernel_uid_t32	ex32_anon_uid;
	__kernel_gid_t32	ex32_anon_gid;
};

struct nfsctl_uidmap32 {
	u32			ug32_ident;   /* char * */
	__kernel_uid_t32	ug32_uidbase;
	s32			ug32_uidlen;
	u32			ug32_udimap;  /* uid_t * */
	__kernel_uid_t32	ug32_gidbase;
	s32			ug32_gidlen;
	u32			ug32_gdimap;  /* gid_t * */
};

struct nfsctl_fhparm32 {
	struct sockaddr		gf32_addr;
	__kernel_dev_t32	gf32_dev;
	__kernel_ino_t32	gf32_ino;
	s32			gf32_version;
};

struct nfsctl_arg32 {
	s32			ca32_version;	/* safeguard */
	union {
		struct nfsctl_svc32	u32_svc;
		struct nfsctl_client32	u32_client;
		struct nfsctl_export32	u32_export;
		struct nfsctl_uidmap32	u32_umap;
		struct nfsctl_fhparm32	u32_getfh;
		u32			u32_debug;
	} u;
#define ca32_svc	u.u32_svc
#define ca32_client	u.u32_client
#define ca32_export	u.u32_export
#define ca32_umap	u.u32_umap
#define ca32_getfh	u.u32_getfh
#define ca32_authd	u.u32_authd
#define ca32_debug	u.u32_debug
};

union nfsctl_res32 {
	struct knfs_fh		cr32_getfh;
	u32			cr32_debug;
};

static int
nfs_svc32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
	int err;

	err = __get_user(karg->ca_version, &arg32->ca32_version);
	err |= __get_user(karg->ca_svc.svc_port, &arg32->ca32_svc.svc32_port);
	err |= __get_user(karg->ca_svc.svc_nthreads,
			  &arg32->ca32_svc.svc32_nthreads);
	return err;
}

static int
nfs_clnt32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
	int err;

	err = __get_user(karg->ca_version, &arg32->ca32_version);
	err |= copy_from_user(&karg->ca_client.cl_ident[0],
			  &arg32->ca32_client.cl32_ident[0],
			  NFSCLNT_IDMAX);
	err |= __get_user(karg->ca_client.cl_naddr,
			  &arg32->ca32_client.cl32_naddr);
	err |= copy_from_user(&karg->ca_client.cl_addrlist[0],
			  &arg32->ca32_client.cl32_addrlist[0],
			  (sizeof(struct in_addr) * NFSCLNT_ADDRMAX));
	err |= __get_user(karg->ca_client.cl_fhkeytype,
		      &arg32->ca32_client.cl32_fhkeytype);
	err |= __get_user(karg->ca_client.cl_fhkeylen,
		      &arg32->ca32_client.cl32_fhkeylen);
	err |= copy_from_user(&karg->ca_client.cl_fhkey[0],
			  &arg32->ca32_client.cl32_fhkey[0],
			  NFSCLNT_KEYMAX);
	return err;
}

static int
nfs_exp32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
	int err;

	err = __get_user(karg->ca_version, &arg32->ca32_version);
	err |= copy_from_user(&karg->ca_export.ex_client[0],
			  &arg32->ca32_export.ex32_client[0],
			  NFSCLNT_IDMAX);
	err |= copy_from_user(&karg->ca_export.ex_path[0],
			  &arg32->ca32_export.ex32_path[0],
			  NFS_MAXPATHLEN);
	err |= __get_user(karg->ca_export.ex_dev,
		      &arg32->ca32_export.ex32_dev);
	err |= __get_user(karg->ca_export.ex_ino,
		      &arg32->ca32_export.ex32_ino);
	err |= __get_user(karg->ca_export.ex_flags,
		      &arg32->ca32_export.ex32_flags);
	err |= __get_user(karg->ca_export.ex_anon_uid,
		      &arg32->ca32_export.ex32_anon_uid);
	err |= __get_user(karg->ca_export.ex_anon_gid,
		      &arg32->ca32_export.ex32_anon_gid);
	return err;
}

static int
nfs_uud32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
	u32 uaddr;
	int i;
	int err;

	memset(karg, 0, sizeof(*karg));
	if(__get_user(karg->ca_version, &arg32->ca32_version))
		return -EFAULT;
	karg->ca_umap.ug_ident = (char *)get_free_page(GFP_USER);
	if(!karg->ca_umap.ug_ident)
		return -ENOMEM;
	err = __get_user(uaddr, &arg32->ca32_umap.ug32_ident);
	if(strncpy_from_user(karg->ca_umap.ug_ident,
			     (char *)A(uaddr), PAGE_SIZE) <= 0)
		return -EFAULT;
	err |= __get_user(karg->ca_umap.ug_uidbase,
		      &arg32->ca32_umap.ug32_uidbase);
	err |= __get_user(karg->ca_umap.ug_uidlen,
		      &arg32->ca32_umap.ug32_uidlen);
	err |= __get_user(uaddr, &arg32->ca32_umap.ug32_udimap);
	if (err)
		return -EFAULT;
	karg->ca_umap.ug_udimap = kmalloc((sizeof(uid_t) *
					   karg->ca_umap.ug_uidlen),
					  GFP_USER);
	if(!karg->ca_umap.ug_udimap)
		return -ENOMEM;
	for(i = 0; i < karg->ca_umap.ug_uidlen; i++)
		err |= __get_user(karg->ca_umap.ug_udimap[i],
			      &(((__kernel_uid_t32 *)A(uaddr))[i]));
	err |= __get_user(karg->ca_umap.ug_gidbase,
		      &arg32->ca32_umap.ug32_gidbase);
	err |= __get_user(karg->ca_umap.ug_uidlen,
		      &arg32->ca32_umap.ug32_gidlen);
	err |= __get_user(uaddr, &arg32->ca32_umap.ug32_gdimap);
	if (err)
		return -EFAULT;
	karg->ca_umap.ug_gdimap = kmalloc((sizeof(gid_t) *
					   karg->ca_umap.ug_uidlen),
					  GFP_USER);
	if(!karg->ca_umap.ug_gdimap)
		return -ENOMEM;
	for(i = 0; i < karg->ca_umap.ug_gidlen; i++)
		err |= __get_user(karg->ca_umap.ug_gdimap[i],
			      &(((__kernel_gid_t32 *)A(uaddr))[i]));

	return err;
}

static int
nfs_getfh32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
	int err;

	err = __get_user(karg->ca_version, &arg32->ca32_version);
	err |= copy_from_user(&karg->ca_getfh.gf_addr,
			  &arg32->ca32_getfh.gf32_addr,
			  (sizeof(struct sockaddr)));
	err |= __get_user(karg->ca_getfh.gf_dev,
		      &arg32->ca32_getfh.gf32_dev);
	err |= __get_user(karg->ca_getfh.gf_ino,
		      &arg32->ca32_getfh.gf32_ino);
	err |= __get_user(karg->ca_getfh.gf_version,
		      &arg32->ca32_getfh.gf32_version);
	return err;
}

static int
nfs_getfh32_res_trans(union nfsctl_res *kres, union nfsctl_res32 *res32)
{
	int err;

	err = copy_to_user(&res32->cr32_getfh,
			&kres->cr_getfh,
			sizeof(res32->cr32_getfh));
	err |= __put_user(kres->cr_debug, &res32->cr32_debug);
	return err;
}

extern asmlinkage long sys_nfsservctl(int cmd, void *arg, void *resp);

int asmlinkage
sys32_nfsservctl(int cmd, struct nfsctl_arg32 *arg32, union nfsctl_res32 *res32)
{
	struct nfsctl_arg *karg = NULL;
	union nfsctl_res *kres = NULL;
	mm_segment_t oldfs;
	int err;

	karg = kmalloc(sizeof(*karg), GFP_USER);
	if(!karg)
		return -ENOMEM;
	if(res32) {
		kres = kmalloc(sizeof(*kres), GFP_USER);
		if(!kres) {
			kfree(karg);
			return -ENOMEM;
		}
	}
	switch(cmd) {
	case NFSCTL_SVC:
		err = nfs_svc32_trans(karg, arg32);
		break;
	case NFSCTL_ADDCLIENT:
		err = nfs_clnt32_trans(karg, arg32);
		break;
	case NFSCTL_DELCLIENT:
		err = nfs_clnt32_trans(karg, arg32);
		break;
	case NFSCTL_EXPORT:
		err = nfs_exp32_trans(karg, arg32);
		break;
	/* This one is unimplemented, be we're ready for it. */
	case NFSCTL_UGIDUPDATE:
		err = nfs_uud32_trans(karg, arg32);
		break;
	case NFSCTL_GETFH:
		err = nfs_getfh32_trans(karg, arg32);
		break;
	default:
		err = -EINVAL;
		break;
	}
	if(err)
		goto done;
	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_nfsservctl(cmd, karg, kres);
	set_fs(oldfs);

	if(!err && cmd == NFSCTL_GETFH)
		err = nfs_getfh32_res_trans(kres, res32);

done:
	if(karg) {
		if(cmd == NFSCTL_UGIDUPDATE) {
			if(karg->ca_umap.ug_ident)
				kfree(karg->ca_umap.ug_ident);
			if(karg->ca_umap.ug_udimap)
				kfree(karg->ca_umap.ug_udimap);
			if(karg->ca_umap.ug_gdimap)
				kfree(karg->ca_umap.ug_gdimap);
		}
		kfree(karg);
	}
	if(kres)
		kfree(kres);
	return err;
}

/* Handle adjtimex compatability. */

struct timex32 {
	u32 modes;
	s32 offset, freq, maxerror, esterror;
	s32 status, constant, precision, tolerance;
	struct timeval32 time;
	s32 tick;
	s32 ppsfreq, jitter, shift, stabil;
	s32 jitcnt, calcnt, errcnt, stbcnt;
	s32  :32; s32  :32; s32  :32; s32  :32;
	s32  :32; s32  :32; s32  :32; s32  :32;
	s32  :32; s32  :32; s32  :32; s32  :32;
};

extern int do_adjtimex(struct timex *);

asmlinkage long
sys32_adjtimex(struct timex32 *utp)
{
	struct timex txc;
	int ret;

	memset(&txc, 0, sizeof(struct timex));

	if(get_user(txc.modes, &utp->modes) ||
	   __get_user(txc.offset, &utp->offset) ||
	   __get_user(txc.freq, &utp->freq) ||
	   __get_user(txc.maxerror, &utp->maxerror) ||
	   __get_user(txc.esterror, &utp->esterror) ||
	   __get_user(txc.status, &utp->status) ||
	   __get_user(txc.constant, &utp->constant) ||
	   __get_user(txc.precision, &utp->precision) ||
	   __get_user(txc.tolerance, &utp->tolerance) ||
	   __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
	   __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
	   __get_user(txc.tick, &utp->tick) ||
	   __get_user(txc.ppsfreq, &utp->ppsfreq) ||
	   __get_user(txc.jitter, &utp->jitter) ||
	   __get_user(txc.shift, &utp->shift) ||
	   __get_user(txc.stabil, &utp->stabil) ||
	   __get_user(txc.jitcnt, &utp->jitcnt) ||
	   __get_user(txc.calcnt, &utp->calcnt) ||
	   __get_user(txc.errcnt, &utp->errcnt) ||
	   __get_user(txc.stbcnt, &utp->stbcnt))
		return -EFAULT;

	ret = do_adjtimex(&txc);

	if(put_user(txc.modes, &utp->modes) ||
	   __put_user(txc.offset, &utp->offset) ||
	   __put_user(txc.freq, &utp->freq) ||
	   __put_user(txc.maxerror, &utp->maxerror) ||
	   __put_user(txc.esterror, &utp->esterror) ||
	   __put_user(txc.status, &utp->status) ||
	   __put_user(txc.constant, &utp->constant) ||
	   __put_user(txc.precision, &utp->precision) ||
	   __put_user(txc.tolerance, &utp->tolerance) ||
	   __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
	   __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
	   __put_user(txc.tick, &utp->tick) ||
	   __put_user(txc.ppsfreq, &utp->ppsfreq) ||
	   __put_user(txc.jitter, &utp->jitter) ||
	   __put_user(txc.shift, &utp->shift) ||
	   __put_user(txc.stabil, &utp->stabil) ||
	   __put_user(txc.jitcnt, &utp->jitcnt) ||
	   __put_user(txc.calcnt, &utp->calcnt) ||
	   __put_user(txc.errcnt, &utp->errcnt) ||
	   __put_user(txc.stbcnt, &utp->stbcnt))
		ret = -EFAULT;

	return ret;
}
#endif /* NOTYET */