Fix error handling in HDIO_GETGEO compat wrapper

[linux-2.6/btrfs-unstable.git] / 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) 2000-2003, 2005 Hewlett-Packard Co
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2004           Gordon Jin <gordon.jin@intel.com>
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment.
 */

#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/signal.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/utsname.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/quota.h>
#include <linux/syscalls.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/eventpoll.h>
#include <linux/personality.h>
#include <linux/ptrace.h>
#include <linux/stat.h>
#include <linux/ipc.h>
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/mman.h>
#include <linux/mutex.h>

#include <asm/intrinsics.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>

#include "ia32priv.h"

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

#define DEBUG   0

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

#define ROUND_UP(x,a)   ((__typeof__(x))(((unsigned long)(x) + ((a) - 1)) & ~((a) - 1)))

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

#define high2lowuid(uid) ((uid) > 65535 ? 65534 : (uid))
#define high2lowgid(gid) ((gid) > 65535 ? 65534 : (gid))

/*
 * Anything that modifies or inspects ia32 user virtual memory must hold this semaphore
 * while doing so.
 */
/* XXX make per-mm: */
static DEFINE_MUTEX(ia32_mmap_mutex);

asmlinkage long
sys32_execve (char __user *name, compat_uptr_t __user *argv, compat_uptr_t __user *envp,
              struct pt_regs *regs)
{
        long error;
        char *filename;
        unsigned long old_map_base, old_task_size, tssd;

        filename = getname(name);
        error = PTR_ERR(filename);
        if (IS_ERR(filename))
                return error;

        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);

        error = compat_do_execve(filename, argv, envp, regs);
        putname(filename);

        if (error < 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;
        }

        return error;
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
{
        compat_ino_t ino;
        int err;

        if ((u64) stat->size > MAX_NON_LFS ||
            !old_valid_dev(stat->dev) ||
            !old_valid_dev(stat->rdev))
                return -EOVERFLOW;

        ino = stat->ino;
        if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
                return -EOVERFLOW;

        if (clear_user(ubuf, sizeof(*ubuf)))
                return -EFAULT;

        err  = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
        err |= __put_user(ino, &ubuf->st_ino);
        err |= __put_user(stat->mode, &ubuf->st_mode);
        err |= __put_user(stat->nlink, &ubuf->st_nlink);
        err |= __put_user(high2lowuid(stat->uid), &ubuf->st_uid);
        err |= __put_user(high2lowgid(stat->gid), &ubuf->st_gid);
        err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
        err |= __put_user(stat->size, &ubuf->st_size);
        err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
        err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
        err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
        err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
        err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
        err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
        err |= __put_user(stat->blksize, &ubuf->st_blksize);
        err |= __put_user(stat->blocks, &ubuf->st_blocks);
        return err;
}

#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 __user *) 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 __user *) PAGE_START(start), PAGE_SIZE);

        down_write(&current->mm->mmap_sem);
        {
                ret = do_mmap(NULL, 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 (offset_in_page(start))
                        copy_to_user((void __user *) PAGE_START(start), page,
                                     offset_in_page(start));
                if (offset_in_page(end))
                        copy_to_user((void __user *) end, page + offset_in_page(end),
                                     PAGE_SIZE - offset_in_page(end));
        }

        if (!(flags & MAP_ANONYMOUS)) {
                /* read the file contents */
                inode = file->f_path.dentry->d_inode;
                if (!inode->i_fop || !file->f_op->read
                    || ((*file->f_op->read)(file, (char __user *) 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;
}

/* SLAB cache for partial_page structures */
struct kmem_cache *partial_page_cachep;

/*
 * init partial_page_list.
 * return 0 means kmalloc fail.
 */
struct partial_page_list*
ia32_init_pp_list(void)
{
        struct partial_page_list *p;

        if ((p = kmalloc(sizeof(*p), GFP_KERNEL)) == NULL)
                return p;
        p->pp_head = NULL;
        p->ppl_rb = RB_ROOT;
        p->pp_hint = NULL;
        atomic_set(&p->pp_count, 1);
        return p;
}

/*
 * Search for the partial page with @start in partial page list @ppl.
 * If finds the partial page, return the found partial page.
 * Else, return 0 and provide @pprev, @rb_link, @rb_parent to
 * be used by later __ia32_insert_pp().
 */
static struct partial_page *
__ia32_find_pp(struct partial_page_list *ppl, unsigned int start,
        struct partial_page **pprev, struct rb_node ***rb_link,
        struct rb_node **rb_parent)
{
        struct partial_page *pp;
        struct rb_node **__rb_link, *__rb_parent, *rb_prev;

        pp = ppl->pp_hint;
        if (pp && pp->base == start)
                return pp;

        __rb_link = &ppl->ppl_rb.rb_node;
        rb_prev = __rb_parent = NULL;

        while (*__rb_link) {
                __rb_parent = *__rb_link;
                pp = rb_entry(__rb_parent, struct partial_page, pp_rb);

                if (pp->base == start) {
                        ppl->pp_hint = pp;
                        return pp;
                } else if (pp->base < start) {
                        rb_prev = __rb_parent;
                        __rb_link = &__rb_parent->rb_right;
                } else {
                        __rb_link = &__rb_parent->rb_left;
                }
        }

        *rb_link = __rb_link;
        *rb_parent = __rb_parent;
        *pprev = NULL;
        if (rb_prev)
                *pprev = rb_entry(rb_prev, struct partial_page, pp_rb);
        return NULL;
}

/*
 * insert @pp into @ppl.
 */
static void
__ia32_insert_pp(struct partial_page_list *ppl, struct partial_page *pp,
         struct partial_page *prev, struct rb_node **rb_link,
        struct rb_node *rb_parent)
{
        /* link list */
        if (prev) {
                pp->next = prev->next;
                prev->next = pp;
        } else {
                ppl->pp_head = pp;
                if (rb_parent)
                        pp->next = rb_entry(rb_parent,
                                struct partial_page, pp_rb);
                else
                        pp->next = NULL;
        }

        /* link rb */
        rb_link_node(&pp->pp_rb, rb_parent, rb_link);
        rb_insert_color(&pp->pp_rb, &ppl->ppl_rb);

        ppl->pp_hint = pp;
}

/*
 * delete @pp from partial page list @ppl.
 */
static void
__ia32_delete_pp(struct partial_page_list *ppl, struct partial_page *pp,
        struct partial_page *prev)
{
        if (prev) {
                prev->next = pp->next;
                if (ppl->pp_hint == pp)
                        ppl->pp_hint = prev;
        } else {
                ppl->pp_head = pp->next;
                if (ppl->pp_hint == pp)
                        ppl->pp_hint = pp->next;
        }
        rb_erase(&pp->pp_rb, &ppl->ppl_rb);
        kmem_cache_free(partial_page_cachep, pp);
}

static struct partial_page *
__pp_prev(struct partial_page *pp)
{
        struct rb_node *prev = rb_prev(&pp->pp_rb);
        if (prev)
                return rb_entry(prev, struct partial_page, pp_rb);
        else
                return NULL;
}

/*
 * Delete partial pages with address between @start and @end.
 * @start and @end are page aligned.
 */
static void
__ia32_delete_pp_range(unsigned int start, unsigned int end)
{
        struct partial_page *pp, *prev;
        struct rb_node **rb_link, *rb_parent;

        if (start >= end)
                return;

        pp = __ia32_find_pp(current->thread.ppl, start, &prev,
                                        &rb_link, &rb_parent);
        if (pp)
                prev = __pp_prev(pp);
        else {
                if (prev)
                        pp = prev->next;
                else
                        pp = current->thread.ppl->pp_head;
        }

        while (pp && pp->base < end) {
                struct partial_page *tmp = pp->next;
                __ia32_delete_pp(current->thread.ppl, pp, prev);
                pp = tmp;
        }
}

/*
 * Set the range between @start and @end in bitmap.
 * @start and @end should be IA32 page aligned and in the same IA64 page.
 */
static int
__ia32_set_pp(unsigned int start, unsigned int end, int flags)
{
        struct partial_page *pp, *prev;
        struct rb_node ** rb_link, *rb_parent;
        unsigned int pstart, start_bit, end_bit, i;

        pstart = PAGE_START(start);
        start_bit = (start % PAGE_SIZE) / IA32_PAGE_SIZE;
        end_bit = (end % PAGE_SIZE) / IA32_PAGE_SIZE;
        if (end_bit == 0)
                end_bit = PAGE_SIZE / IA32_PAGE_SIZE;
        pp = __ia32_find_pp(current->thread.ppl, pstart, &prev,
                                        &rb_link, &rb_parent);
        if (pp) {
                for (i = start_bit; i < end_bit; i++)
                        set_bit(i, &pp->bitmap);
                /*
                 * Check: if this partial page has been set to a full page,
                 * then delete it.
                 */
                if (find_first_zero_bit(&pp->bitmap, sizeof(pp->bitmap)*8) >=
                                PAGE_SIZE/IA32_PAGE_SIZE) {
                        __ia32_delete_pp(current->thread.ppl, pp, __pp_prev(pp));
                }
                return 0;
        }

        /*
         * MAP_FIXED may lead to overlapping mmap.
         * In this case, the requested mmap area may already mmaped as a full
         * page. So check vma before adding a new partial page.
         */
        if (flags & MAP_FIXED) {
                struct vm_area_struct *vma = find_vma(current->mm, pstart);
                if (vma && vma->vm_start <= pstart)
                        return 0;
        }

        /* new a partial_page */
        pp = kmem_cache_alloc(partial_page_cachep, GFP_KERNEL);
        if (!pp)
                return -ENOMEM;
        pp->base = pstart;
        pp->bitmap = 0;
        for (i=start_bit; i<end_bit; i++)
                set_bit(i, &(pp->bitmap));
        pp->next = NULL;
        __ia32_insert_pp(current->thread.ppl, pp, prev, rb_link, rb_parent);
        return 0;
}

/*
 * @start and @end should be IA32 page aligned, but don't need to be in the
 * same IA64 page. Split @start and @end to make sure they're in the same IA64
 * page, then call __ia32_set_pp().
 */
static void
ia32_set_pp(unsigned int start, unsigned int end, int flags)
{
        down_write(&current->mm->mmap_sem);
        if (flags & MAP_FIXED) {
                /*
                 * MAP_FIXED may lead to overlapping mmap. When this happens,
                 * a series of complete IA64 pages results in deletion of
                 * old partial pages in that range.
                 */
                __ia32_delete_pp_range(PAGE_ALIGN(start), PAGE_START(end));
        }

        if (end < PAGE_ALIGN(start)) {
                __ia32_set_pp(start, end, flags);
        } else {
                if (offset_in_page(start))
                        __ia32_set_pp(start, PAGE_ALIGN(start), flags);
                if (offset_in_page(end))
                        __ia32_set_pp(PAGE_START(end), end, flags);
        }
        up_write(&current->mm->mmap_sem);
}

/*
 * Unset the range between @start and @end in bitmap.
 * @start and @end should be IA32 page aligned and in the same IA64 page.
 * After doing that, if the bitmap is 0, then free the page and return 1,
 *      else return 0;
 * If not find the partial page in the list, then
 *      If the vma exists, then the full page is set to a partial page;
 *      Else return -ENOMEM.
 */
static int
__ia32_unset_pp(unsigned int start, unsigned int end)
{
        struct partial_page *pp, *prev;
        struct rb_node ** rb_link, *rb_parent;
        unsigned int pstart, start_bit, end_bit, i;
        struct vm_area_struct *vma;

        pstart = PAGE_START(start);
        start_bit = (start % PAGE_SIZE) / IA32_PAGE_SIZE;
        end_bit = (end % PAGE_SIZE) / IA32_PAGE_SIZE;
        if (end_bit == 0)
                end_bit = PAGE_SIZE / IA32_PAGE_SIZE;

        pp = __ia32_find_pp(current->thread.ppl, pstart, &prev,
                                        &rb_link, &rb_parent);
        if (pp) {
                for (i = start_bit; i < end_bit; i++)
                        clear_bit(i, &pp->bitmap);
                if (pp->bitmap == 0) {
                        __ia32_delete_pp(current->thread.ppl, pp, __pp_prev(pp));
                        return 1;
                }
                return 0;
        }

        vma = find_vma(current->mm, pstart);
        if (!vma || vma->vm_start > pstart) {
                return -ENOMEM;
        }

        /* new a partial_page */
        pp = kmem_cache_alloc(partial_page_cachep, GFP_KERNEL);
        if (!pp)
                return -ENOMEM;
        pp->base = pstart;
        pp->bitmap = 0;
        for (i = 0; i < start_bit; i++)
                set_bit(i, &(pp->bitmap));
        for (i = end_bit; i < PAGE_SIZE / IA32_PAGE_SIZE; i++)
                set_bit(i, &(pp->bitmap));
        pp->next = NULL;
        __ia32_insert_pp(current->thread.ppl, pp, prev, rb_link, rb_parent);
        return 0;
}

/*
 * Delete pp between PAGE_ALIGN(start) and PAGE_START(end) by calling
 * __ia32_delete_pp_range(). Unset possible partial pages by calling
 * __ia32_unset_pp().
 * The returned value see __ia32_unset_pp().
 */
static int
ia32_unset_pp(unsigned int *startp, unsigned int *endp)
{
        unsigned int start = *startp, end = *endp;
        int ret = 0;

        down_write(&current->mm->mmap_sem);

        __ia32_delete_pp_range(PAGE_ALIGN(start), PAGE_START(end));

        if (end < PAGE_ALIGN(start)) {
                ret = __ia32_unset_pp(start, end);
                if (ret == 1) {
                        *startp = PAGE_START(start);
                        *endp = PAGE_ALIGN(end);
                }
                if (ret == 0) {
                        /* to shortcut sys_munmap() in sys32_munmap() */
                        *startp = PAGE_START(start);
                        *endp = PAGE_START(end);
                }
        } else {
                if (offset_in_page(start)) {
                        ret = __ia32_unset_pp(start, PAGE_ALIGN(start));
                        if (ret == 1)
                                *startp = PAGE_START(start);
                        if (ret == 0)
                                *startp = PAGE_ALIGN(start);
                        if (ret < 0)
                                goto out;
                }
                if (offset_in_page(end)) {
                        ret = __ia32_unset_pp(PAGE_START(end), end);
                        if (ret == 1)
                                *endp = PAGE_ALIGN(end);
                        if (ret == 0)
                                *endp = PAGE_START(end);
                }
        }

 out:
        up_write(&current->mm->mmap_sem);
        return ret;
}

/*
 * Compare the range between @start and @end with bitmap in partial page.
 * @start and @end should be IA32 page aligned and in the same IA64 page.
 */
static int
__ia32_compare_pp(unsigned int start, unsigned int end)
{
        struct partial_page *pp, *prev;
        struct rb_node ** rb_link, *rb_parent;
        unsigned int pstart, start_bit, end_bit, size;
        unsigned int first_bit, next_zero_bit;  /* the first range in bitmap */

        pstart = PAGE_START(start);

        pp = __ia32_find_pp(current->thread.ppl, pstart, &prev,
                                        &rb_link, &rb_parent);
        if (!pp)
                return 1;

        start_bit = (start % PAGE_SIZE) / IA32_PAGE_SIZE;
        end_bit = (end % PAGE_SIZE) / IA32_PAGE_SIZE;
        size = sizeof(pp->bitmap) * 8;
        first_bit = find_first_bit(&pp->bitmap, size);
        next_zero_bit = find_next_zero_bit(&pp->bitmap, size, first_bit);
        if ((start_bit < first_bit) || (end_bit > next_zero_bit)) {
                /* exceeds the first range in bitmap */
                return -ENOMEM;
        } else if ((start_bit == first_bit) && (end_bit == next_zero_bit)) {
                first_bit = find_next_bit(&pp->bitmap, size, next_zero_bit);
                if ((next_zero_bit < first_bit) && (first_bit < size))
                        return 1;       /* has next range */
                else
                        return 0;       /* no next range */
        } else
                return 1;
}

/*
 * @start and @end should be IA32 page aligned, but don't need to be in the
 * same IA64 page. Split @start and @end to make sure they're in the same IA64
 * page, then call __ia32_compare_pp().
 *
 * Take this as example: the range is the 1st and 2nd 4K page.
 * Return 0 if they fit bitmap exactly, i.e. bitmap = 00000011;
 * Return 1 if the range doesn't cover whole bitmap, e.g. bitmap = 00001111;
 * Return -ENOMEM if the range exceeds the bitmap, e.g. bitmap = 00000001 or
 *      bitmap = 00000101.
 */
static int
ia32_compare_pp(unsigned int *startp, unsigned int *endp)
{
        unsigned int start = *startp, end = *endp;
        int retval = 0;

        down_write(&current->mm->mmap_sem);

        if (end < PAGE_ALIGN(start)) {
                retval = __ia32_compare_pp(start, end);
                if (retval == 0) {
                        *startp = PAGE_START(start);
                        *endp = PAGE_ALIGN(end);
                }
        } else {
                if (offset_in_page(start)) {
                        retval = __ia32_compare_pp(start,
                                                   PAGE_ALIGN(start));
                        if (retval == 0)
                                *startp = PAGE_START(start);
                        if (retval < 0)
                                goto out;
                }
                if (offset_in_page(end)) {
                        retval = __ia32_compare_pp(PAGE_START(end), end);
                        if (retval == 0)
                                *endp = PAGE_ALIGN(end);
                }
        }

 out:
        up_write(&current->mm->mmap_sem);
        return retval;
}

static void
__ia32_drop_pp_list(struct partial_page_list *ppl)
{
        struct partial_page *pp = ppl->pp_head;

        while (pp) {
                struct partial_page *next = pp->next;
                kmem_cache_free(partial_page_cachep, pp);
                pp = next;
        }

        kfree(ppl);
}

void
ia32_drop_partial_page_list(struct task_struct *task)
{
        struct partial_page_list* ppl = task->thread.ppl;

        if (ppl && atomic_dec_and_test(&ppl->pp_count))
                __ia32_drop_pp_list(ppl);
}

/*
 * Copy current->thread.ppl to ppl (already initialized).
 */
static int
__ia32_copy_pp_list(struct partial_page_list *ppl)
{
        struct partial_page *pp, *tmp, *prev;
        struct rb_node **rb_link, *rb_parent;

        ppl->pp_head = NULL;
        ppl->pp_hint = NULL;
        ppl->ppl_rb = RB_ROOT;
        rb_link = &ppl->ppl_rb.rb_node;
        rb_parent = NULL;
        prev = NULL;

        for (pp = current->thread.ppl->pp_head; pp; pp = pp->next) {
                tmp = kmem_cache_alloc(partial_page_cachep, GFP_KERNEL);
                if (!tmp)
                        return -ENOMEM;
                *tmp = *pp;
                __ia32_insert_pp(ppl, tmp, prev, rb_link, rb_parent);
                prev = tmp;
                rb_link = &tmp->pp_rb.rb_right;
                rb_parent = &tmp->pp_rb;
        }
        return 0;
}

int
ia32_copy_partial_page_list(struct task_struct *p, unsigned long clone_flags)
{
        int retval = 0;

        if (clone_flags & CLONE_VM) {
                atomic_inc(&current->thread.ppl->pp_count);
                p->thread.ppl = current->thread.ppl;
        } else {
                p->thread.ppl = ia32_init_pp_list();
                if (!p->thread.ppl)
                        return -ENOMEM;
                down_write(&current->mm->mmap_sem);
                {
                        retval = __ia32_copy_pp_list(p->thread.ppl);
                }
                up_write(&current->mm->mmap_sem);
        }

        return retval;
}

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) {
                ia32_set_pp((unsigned int)start, (unsigned int)end, flags);
                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)
                                goto out;       /* 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) - offset_in_page(end));
                        if (IS_ERR((void *) ret))
                                return ret;
                        pend -= PAGE_SIZE;
                        if (pstart >= pend)
                                goto out;       /* 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 + offset_in_page(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) || (offset_in_page(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(NULL, 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_path.dentry->d_inode;
                if (!inode->i_fop || !file->f_op->read
                    || ((*file->f_op->read)(file, (char __user *) 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;
        }

        if (!(flags & MAP_FIXED))
                ia32_set_pp((unsigned int)start, (unsigned int)end, flags);
out:
        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
        mutex_lock(&ia32_mmap_mutex);
        {
                addr = emulate_mmap(file, addr, len, prot, flags, offset);
        }
        mutex_unlock(&ia32_mmap_mutex);
#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 __user *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 (OFFSET4K(start))
                return -EINVAL;

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

        ret = ia32_unset_pp(&start, &end);
        if (ret < 0)
                return ret;

        if (start >= end)
                return 0;

        mutex_lock(&ia32_mmap_mutex);
        ret = sys_munmap(start, end - start);
        mutex_unlock(&ia32_mmap_mutex);
#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 int 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;

        retval = ia32_compare_pp(&start, &end);

        if (retval < 0)
                return retval;

        mutex_lock(&ia32_mmap_mutex);
        {
                if (offset_in_page(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 (offset_in_page(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:
        mutex_unlock(&ia32_mmap_mutex);
        return retval;
#endif
}

asmlinkage long
sys32_mremap (unsigned int addr, unsigned int old_len, unsigned int new_len,
                unsigned int flags, unsigned int new_addr)
{
        long ret;

#if PAGE_SHIFT <= IA32_PAGE_SHIFT
        ret = sys_mremap(addr, old_len, new_len, flags, new_addr);
#else
        unsigned int old_end, new_end;

        if (OFFSET4K(addr))
                return -EINVAL;

        old_len = IA32_PAGE_ALIGN(old_len);
        new_len = IA32_PAGE_ALIGN(new_len);
        old_end = addr + old_len;
        new_end = addr + new_len;

        if (!new_len)
                return -EINVAL;

        if ((flags & MREMAP_FIXED) && (OFFSET4K(new_addr)))
                return -EINVAL;

        if (old_len >= new_len) {
                ret = sys32_munmap(addr + new_len, old_len - new_len);
                if (ret && old_len != new_len)
                        return ret;
                ret = addr;
                if (!(flags & MREMAP_FIXED) || (new_addr == addr))
                        return ret;
                old_len = new_len;
        }

        addr = PAGE_START(addr);
        old_len = PAGE_ALIGN(old_end) - addr;
        new_len = PAGE_ALIGN(new_end) - addr;

        mutex_lock(&ia32_mmap_mutex);
        ret = sys_mremap(addr, old_len, new_len, flags, new_addr);
        mutex_unlock(&ia32_mmap_mutex);

        if ((ret >= 0) && (old_len < new_len)) {
                /* mremap expanded successfully */
                ia32_set_pp(old_end, new_end, flags);
        }
#endif
        return ret;
}

asmlinkage long
sys32_pipe (int __user *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 long
get_tv32 (struct timeval *o, struct compat_timeval __user *i)
{
        return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
                (__get_user(o->tv_sec, &i->tv_sec) | __get_user(o->tv_usec, &i->tv_usec)));
}

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

asmlinkage unsigned long
sys32_alarm (unsigned int seconds)
{
        return alarm_setitimer(seconds);
}

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

extern struct timezone sys_tz;

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

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

        if (tv) {
                if (get_tv32(&ktv, tv))
                        return -EFAULT;
                kts.tv_sec = ktv.tv_sec;
                kts.tv_nsec = ktv.tv_usec * 1000;
        }
        if (tz) {
                if (copy_from_user(&ktz, tz, sizeof(ktz)))
                        return -EFAULT;
        }

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

struct getdents32_callback {
        struct compat_dirent __user *current_dir;
        struct compat_dirent __user *previous;
        int count;
        int error;
};

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

static int
filldir32 (void *__buf, const char *name, int namlen, loff_t offset, u64 ino,
           unsigned int d_type)
{
        struct compat_dirent __user * dirent;
        struct getdents32_callback * buf = (struct getdents32_callback *) __buf;
        int reclen = ROUND_UP(offsetof(struct compat_dirent, d_name) + namlen + 1, 4);
        u32 d_ino;

        buf->error = -EINVAL;   /* only used if we fail.. */
        if (reclen > buf->count)
                return -EINVAL;
        d_ino = ino;
        if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
                return -EOVERFLOW;
        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(d_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;
        dirent = (struct compat_dirent __user *) ((char __user *) dirent + reclen);
        buf->current_dir = dirent;
        buf->count -= reclen;
        return 0;
}

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

        error = -EFAULT;
        if (!access_ok(VERIFY_WRITE, dirent, count))
                goto out;

        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) {
                if (put_user(file->f_pos, &lastdirent->d_off))
                        error = -EFAULT;
                else
                        error = count - buf.count;
        }

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

static int
fillonedir32 (void * __buf, const char * name, int namlen, loff_t offset, u64 ino,
              unsigned int d_type)
{
        struct readdir32_callback * buf = (struct readdir32_callback *) __buf;
        struct old_linux32_dirent __user * dirent;
        u32 d_ino;

        if (buf->count)
                return -EINVAL;
        d_ino = ino;
        if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
                return -EOVERFLOW;
        buf->count++;
        dirent = buf->dirent;
        if (put_user(d_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 __user *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;
}

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 __user *arg)
{
        struct sel_arg_struct a;

        if (copy_from_user(&a, arg, sizeof(a)))
                return -EFAULT;
        return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
                                 compat_ptr(a.exp), compat_ptr(a.tvp));
}

#define SEMOP            1
#define SEMGET           2
#define SEMCTL           3
#define SEMTIMEDOP       4
#define MSGSND          11
#define MSGRCV          12
#define MSGGET          13
#define MSGCTL          14
#define SHMAT           21
#define SHMDT           22
#define SHMGET          23
#define SHMCTL          24

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 SEMTIMEDOP:
                if (fifth)
                        return compat_sys_semtimedop(first, compat_ptr(ptr),
                                second, compat_ptr(fifth));
                /* else fall through for normal semop() */
              case SEMOP:
                /* struct sembuf is the same on 32 and 64bit :)) */
                return sys_semtimedop(first, compat_ptr(ptr), second,
                                      NULL);
              case SEMGET:
                return sys_semget(first, second, third);
              case SEMCTL:
                return compat_sys_semctl(first, second, third, compat_ptr(ptr));

              case MSGSND:
                return compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
              case MSGRCV:
                return compat_sys_msgrcv(first, second, fifth, third, version, compat_ptr(ptr));
              case MSGGET:
                return sys_msgget((key_t) first, second);
              case MSGCTL:
                return compat_sys_msgctl(first, second, compat_ptr(ptr));

              case SHMAT:
                return compat_sys_shmat(first, second, third, version, compat_ptr(ptr));
                break;
              case SHMDT:
                return sys_shmdt(compat_ptr(ptr));
              case SHMGET:
                return sys_shmget(first, (unsigned)second, third);
              case SHMCTL:
                return compat_sys_shmctl(first, second, compat_ptr(ptr));

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

asmlinkage long
compat_sys_wait4 (compat_pid_t pid, compat_uint_t * stat_addr, int options,
                 struct compat_rusage *ru);

asmlinkage long
sys32_waitpid (int pid, unsigned int *stat_addr, int options)
{
        return compat_sys_wait4(pid, stat_addr, options, NULL);
}

static unsigned int
ia32_peek (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 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 = task_pt_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 = task_pt_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 __user *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 __user *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 __user *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 = task_pt_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 __user *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 __user *)&save->cwd);
        tsk->thread.fcr = (tsk->thread.fcr & (~0x1f3f)) | (num32 & 0x1f3f);
        __get_user(fsrlo, (unsigned int __user *)&save->swd);
        __get_user(fsrhi, (unsigned int __user *)&save->twd);
        num32 = (fsrhi << 16) | fsrlo;
        tsk->thread.fsr = (tsk->thread.fsr & (~0xffffffff)) | num32;
        __get_user(num32, (unsigned int __user *)&save->fip);
        tsk->thread.fir = (tsk->thread.fir & (~0xffffffff)) | num32;
        __get_user(num32, (unsigned int __user *)&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 = task_pt_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 __user *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 = task_pt_regs(tsk);
        tos = (tsk->thread.fsr >> 11) & 7;
        for (i = 0; i < 8; i++)
                put_fpreg(i, (struct _fpreg_ia32 __user *)&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 __user *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 __user *)&save->cwd);
        tsk->thread.fcr = (tsk->thread.fcr & (~0x1f3f)) | (num32 & 0x1f3f);
        __get_user(fsrlo, (unsigned int __user *)&save->swd);
        __get_user(fsrhi, (unsigned int __user *)&save->twd);
        num32 = (fsrhi << 16) | fsrlo;
        tsk->thread.fsr = (tsk->thread.fsr & (~0xffffffff)) | num32;
        __get_user(num32, (unsigned int __user *)&save->fip);
        tsk->thread.fir = (tsk->thread.fir & (~0xffffffff)) | num32;
        __get_user(num32, (unsigned int __user *)&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 = task_pt_regs(tsk);
        tos = (tsk->thread.fsr >> 11) & 7;
        for (i = 0; i < 8; i++)
        get_fpreg(i, (struct _fpreg_ia32 __user *)&save->st_space[4*i], ptp, swp, tos);

        __get_user(mxcsr, (unsigned int __user *)&save->mxcsr);
        num64 = mxcsr & 0xff10;
        tsk->thread.fcr = (tsk->thread.fcr & (~0xff1000000000UL)) | (num64<<32);
        num64 = mxcsr & 0x3f;
        tsk->thread.fsr = (tsk->thread.fsr & (~0x3f00000000UL)) | (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;
}

asmlinkage long
sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
{
        struct task_struct *child;
        unsigned int value, tmp;
        long i, ret;

        lock_kernel();
        if (request == PTRACE_TRACEME) {
                ret = ptrace_traceme();
                goto out;
        }

        child = ptrace_get_task_struct(pid);
        if (IS_ERR(child)) {
                ret = PTR_ERR(child);
                goto out;
        }

        if (request == PTRACE_ATTACH) {
                ret = sys_ptrace(request, pid, addr, data);
                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(child, addr, &value);
                if (ret == 0)
                        ret = put_user(value, (unsigned int __user *) compat_ptr(data));
                else
                        ret = -EIO;
                goto out_tsk;

              case PTRACE_POKETEXT:
              case PTRACE_POKEDATA:     /* write the word at location addr */
                ret = ia32_poke(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 __user *) compat_ptr(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, compat_ptr(data), 17*sizeof(int))) {
                        ret = -EIO;
                        break;
                }
                for (i = 0; i < (int) (17*sizeof(int)); i += sizeof(int) ) {
                        put_user(getreg(child, i), (unsigned int __user *) compat_ptr(data));
                        data += sizeof(int);
                }
                ret = 0;
                break;

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

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

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

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

              case PTRACE_GETEVENTMSG:   
                ret = put_user(child->ptrace_message, (unsigned int __user *) compat_ptr(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);
                break;

              default:
                ret = ptrace_request(child, request, addr, data);
                break;

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

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

asmlinkage long
sys32_sigaltstack (ia32_stack_t __user *uss32, ia32_stack_t __user *uoss32,
                   long arg2, long arg3, long arg4, long arg5, long arg6,
                   long arg7, struct pt_regs pt)
{
        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 __user *) (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 ? (stack_t __user *) &uss : NULL,
                             (stack_t __user *) &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 __user) 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 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];
};

#ifdef CONFIG_SYSCTL_SYSCALL
asmlinkage long
sys32_sysctl (struct sysctl32 __user *args)
{
        struct sysctl32 a32;
        mm_segment_t old_fs = get_fs ();
        void __user *oldvalp, *newvalp;
        size_t oldlen;
        int __user *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 __user *) compat_ptr(a32.name);
        oldvalp = compat_ptr(a32.oldval);
        newvalp = compat_ptr(a32.newval);

        if ((oldvalp && get_user(oldlen, (int __user *) compat_ptr(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, (size_t __user *) &oldlen,
                        newvalp, (size_t) a32.newlen);
        unlock_kernel();
        set_fs(old_fs);

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

        return ret;
}
#endif

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

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

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

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

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

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

        set_fs(KERNEL_DS);
        ret = sys_getresgid((gid_t __user *) &a, (gid_t __user *) &b, (gid_t __user *) &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)
{
        /* Sign-extension of "offset" is important here... */
        return sys_lseek(fd, offset, whence);
}

static int
groups16_to_user(short __user *grouplist, struct group_info *group_info)
{
        int i;
        short group;

        for (i = 0; i < group_info->ngroups; i++) {
                group = (short)GROUP_AT(group_info, i);
                if (put_user(group, grouplist+i))
                        return -EFAULT;
        }

        return 0;
}

static int
groups16_from_user(struct group_info *group_info, short __user *grouplist)
{
        int i;
        short group;

        for (i = 0; i < group_info->ngroups; i++) {
                if (get_user(group, grouplist+i))
                        return  -EFAULT;
                GROUP_AT(group_info, i) = (gid_t)group;
        }

        return 0;
}

asmlinkage long
sys32_getgroups16 (int gidsetsize, short __user *grouplist)
{
        int i;

        if (gidsetsize < 0)
                return -EINVAL;

        get_group_info(current->group_info);
        i = current->group_info->ngroups;
        if (gidsetsize) {
                if (i > gidsetsize) {
                        i = -EINVAL;
                        goto out;
                }
                if (groups16_to_user(grouplist, current->group_info)) {
                        i = -EFAULT;
                        goto out;
                }
        }
out:
        put_group_info(current->group_info);
        return i;
}

asmlinkage long
sys32_setgroups16 (int gidsetsize, short __user *grouplist)
{
        struct group_info *group_info;
        int retval;

        if (!capable(CAP_SETGID))
                return -EPERM;
        if ((unsigned)gidsetsize > NGROUPS_MAX)
                return -EINVAL;

        group_info = groups_alloc(gidsetsize);
        if (!group_info)
                return -ENOMEM;
        retval = groups16_from_user(group_info, grouplist);
        if (retval) {
                put_group_info(group_info);
                return retval;
        }

        retval = set_current_groups(group_info);
        put_group_info(group_info);

        return retval;
}

asmlinkage long
sys32_truncate64 (unsigned int path, unsigned int len_lo, unsigned int len_hi)
{
        return sys_truncate(compat_ptr(path), ((unsigned long) len_hi << 32) | len_lo);
}

asmlinkage long
sys32_ftruncate64 (int fd, unsigned int len_lo, unsigned int len_hi)
{
        return sys_ftruncate(fd, ((unsigned long) len_hi << 32) | len_lo);
}

static int
putstat64 (struct stat64 __user *ubuf, struct kstat *kbuf)
{
        int err;
        u64 hdev;

        if (clear_user(ubuf, sizeof(*ubuf)))
                return -EFAULT;

        hdev = huge_encode_dev(kbuf->dev);
        err  = __put_user(hdev, (u32 __user*)&ubuf->st_dev);
        err |= __put_user(hdev >> 32, ((u32 __user*)&ubuf->st_dev) + 1);
        err |= __put_user(kbuf->ino, &ubuf->__st_ino);
        err |= __put_user(kbuf->ino, &ubuf->st_ino_lo);
        err |= __put_user(kbuf->ino >> 32, &ubuf->st_ino_hi);
        err |= __put_user(kbuf->mode, &ubuf->st_mode);
        err |= __put_user(kbuf->nlink, &ubuf->st_nlink);
        err |= __put_user(kbuf->uid, &ubuf->st_uid);
        err |= __put_user(kbuf->gid, &ubuf->st_gid);
        hdev = huge_encode_dev(kbuf->rdev);
        err  = __put_user(hdev, (u32 __user*)&ubuf->st_rdev);
        err |= __put_user(hdev >> 32, ((u32 __user*)&ubuf->st_rdev) + 1);
        err |= __put_user(kbuf->size, &ubuf->st_size_lo);
        err |= __put_user((kbuf->size >> 32), &ubuf->st_size_hi);
        err |= __put_user(kbuf->atime.tv_sec, &ubuf->st_atime);
        err |= __put_user(kbuf->atime.tv_nsec, &ubuf->st_atime_nsec);
        err |= __put_user(kbuf->mtime.tv_sec, &ubuf->st_mtime);
        err |= __put_user(kbuf->mtime.tv_nsec, &ubuf->st_mtime_nsec);
        err |= __put_user(kbuf->ctime.tv_sec, &ubuf->st_ctime);
        err |= __put_user(kbuf->ctime.tv_nsec, &ubuf->st_ctime_nsec);
        err |= __put_user(kbuf->blksize, &ubuf->st_blksize);
        err |= __put_user(kbuf->blocks, &ubuf->st_blocks);
        return err;
}

asmlinkage long
sys32_stat64 (char __user *filename, struct stat64 __user *statbuf)
{
        struct kstat s;
        long ret = vfs_stat(filename, &s);
        if (!ret)
                ret = putstat64(statbuf, &s);
        return ret;
}

asmlinkage long
sys32_lstat64 (char __user *filename, struct stat64 __user *statbuf)
{
        struct kstat s;
        long ret = vfs_lstat(filename, &s);
        if (!ret)
                ret = putstat64(statbuf, &s);
        return ret;
}

asmlinkage long
sys32_fstat64 (unsigned int fd, struct stat64 __user *statbuf)
{
        struct kstat s;
        long ret = vfs_fstat(fd, &s);
        if (!ret)
                ret = putstat64(statbuf, &s);
        return ret;
}

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

        set_fs(KERNEL_DS);
        ret = sys_sched_rr_get_interval(pid, (struct timespec __user *) &t);
        set_fs(old_fs);
        if (put_compat_timespec(&t, interval))
                return -EFAULT;
        return ret;
}

asmlinkage long
sys32_pread (unsigned int fd, void __user *buf, unsigned int count, u32 pos_lo, u32 pos_hi)
{
        return sys_pread64(fd, buf, count, ((unsigned long) pos_hi << 32) | pos_lo);
}

asmlinkage long
sys32_pwrite (unsigned int fd, void __user *buf, unsigned int count, u32 pos_lo, u32 pos_hi)
{
        return sys_pwrite64(fd, buf, count, ((unsigned long) pos_hi << 32) | pos_lo);
}

asmlinkage long
sys32_sendfile (int out_fd, int in_fd, int __user *offset, unsigned int count)
{
        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 ? (off_t __user *) &of : NULL, count);
        set_fs(old_fs);

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

        return ret;
}

asmlinkage long
sys32_personality (unsigned int personality)
{
        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(compat_ptr(ret), PAGE_ALIGN(ret) - ret);
        return ret;
}

/* Structure for ia32 emulation on ia64 */
struct epoll_event32
{
        u32 events;
        u32 data[2];
};

asmlinkage long
sys32_epoll_ctl(int epfd, int op, int fd, struct epoll_event32 __user *event)
{
        mm_segment_t old_fs = get_fs();
        struct epoll_event event64;
        int error;
        u32 data_halfword;

        if (!access_ok(VERIFY_READ, event, sizeof(struct epoll_event32)))
                return -EFAULT;

        __get_user(event64.events, &event->events);
        __get_user(data_halfword, &event->data[0]);
        event64.data = data_halfword;
        __get_user(data_halfword, &event->data[1]);
        event64.data |= (u64)data_halfword << 32;

        set_fs(KERNEL_DS);
        error = sys_epoll_ctl(epfd, op, fd, (struct epoll_event __user *) &event64);
        set_fs(old_fs);

        return error;
}

asmlinkage long
sys32_epoll_wait(int epfd, struct epoll_event32 __user * events, int maxevents,
                 int timeout)
{
        struct epoll_event *events64 = NULL;
        mm_segment_t old_fs = get_fs();
        int numevents, size;
        int evt_idx;
        int do_free_pages = 0;

        if (maxevents <= 0) {
                return -EINVAL;
        }

        /* Verify that the area passed by the user is writeable */
        if (!access_ok(VERIFY_WRITE, events, maxevents * sizeof(struct epoll_event32)))
                return -EFAULT;

        /*
         * Allocate space for the intermediate copy.  If the space needed
         * is large enough to cause kmalloc to fail, then try again with
         * __get_free_pages.
         */
        size = maxevents * sizeof(struct epoll_event);
        events64 = kmalloc(size, GFP_KERNEL);
        if (events64 == NULL) {
                events64 = (struct epoll_event *)
                                __get_free_pages(GFP_KERNEL, get_order(size));
                if (events64 == NULL)
                        return -ENOMEM;
                do_free_pages = 1;
        }

        /* Do the system call */
        set_fs(KERNEL_DS); /* copy_to/from_user should work on kernel mem*/
        numevents = sys_epoll_wait(epfd, (struct epoll_event __user *) events64,
                                   maxevents, timeout);
        set_fs(old_fs);

        /* Don't modify userspace memory if we're returning an error */
        if (numevents > 0) {
                /* Translate the 64-bit structures back into the 32-bit
                   structures */
                for (evt_idx = 0; evt_idx < numevents; evt_idx++) {
                        __put_user(events64[evt_idx].events,
                                   &events[evt_idx].events);
                        __put_user((u32)events64[evt_idx].data,
                                   &events[evt_idx].data[0]);
                        __put_user((u32)(events64[evt_idx].data >> 32),
                                   &events[evt_idx].data[1]);
                }
        }

        if (do_free_pages)
                free_pages((unsigned long) events64, get_order(size));
        else
                kfree(events64);
        return numevents;
}

/*
 * Get a yet unused TLS descriptor index.
 */
static int
get_free_idx (void)
{
        struct thread_struct *t = &current->thread;
        int idx;

        for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
                if (desc_empty(t->tls_array + idx))
                        return idx + GDT_ENTRY_TLS_MIN;
        return -ESRCH;
}

/*
 * Set a given TLS descriptor:
 */
asmlinkage int
sys32_set_thread_area (struct ia32_user_desc __user *u_info)
{
        struct thread_struct *t = &current->thread;
        struct ia32_user_desc info;
        struct desc_struct *desc;
        int cpu, idx;

        if (copy_from_user(&info, u_info, sizeof(info)))
                return -EFAULT;
        idx = info.entry_number;

        /*
         * index -1 means the kernel should try to find and allocate an empty descriptor:
         */
        if (idx == -1) {
                idx = get_free_idx();
                if (idx < 0)
                        return idx;
                if (put_user(idx, &u_info->entry_number))
                        return -EFAULT;
        }

        if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
                return -EINVAL;

        desc = t->tls_array + idx - GDT_ENTRY_TLS_MIN;

        cpu = smp_processor_id();

        if (LDT_empty(&info)) {
                desc->a = 0;
                desc->b = 0;
        } else {
                desc->a = LDT_entry_a(&info);
                desc->b = LDT_entry_b(&info);
        }
        load_TLS(t, cpu);
        return 0;
}

/*
 * Get the current Thread-Local Storage area:
 */

#define GET_BASE(desc) (                        \
        (((desc)->a >> 16) & 0x0000ffff) |      \
        (((desc)->b << 16) & 0x00ff0000) |      \
        ( (desc)->b        & 0xff000000)   )

#define GET_LIMIT(desc) (                       \
        ((desc)->a & 0x0ffff) |                 \
         ((desc)->b & 0xf0000) )

#define GET_32BIT(desc)         (((desc)->b >> 22) & 1)
#define GET_CONTENTS(desc)      (((desc)->b >> 10) & 3)
#define GET_WRITABLE(desc)      (((desc)->b >>  9) & 1)
#define GET_LIMIT_PAGES(desc)   (((desc)->b >> 23) & 1)
#define GET_PRESENT(desc)       (((desc)->b >> 15) & 1)
#define GET_USEABLE(desc)       (((desc)->b >> 20) & 1)

asmlinkage int
sys32_get_thread_area (struct ia32_user_desc __user *u_info)
{
        struct ia32_user_desc info;
        struct desc_struct *desc;
        int idx;

        if (get_user(idx, &u_info->entry_number))
                return -EFAULT;
        if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
                return -EINVAL;

        desc = current->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;

        info.entry_number = idx;
        info.base_addr = GET_BASE(desc);
        info.limit = GET_LIMIT(desc);
        info.seg_32bit = GET_32BIT(desc);
        info.contents = GET_CONTENTS(desc);
        info.read_exec_only = !GET_WRITABLE(desc);
        info.limit_in_pages = GET_LIMIT_PAGES(desc);
        info.seg_not_present = !GET_PRESENT(desc);
        info.useable = GET_USEABLE(desc);

        if (copy_to_user(u_info, &info, sizeof(info)))
                return -EFAULT;
        return 0;
}

long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high, 
                        __u32 len_low, __u32 len_high, int advice)
{ 
        return sys_fadvise64_64(fd,
                               (((u64)offset_high)<<32) | offset_low,
                               (((u64)len_high)<<32) | len_low,
                               advice); 
} 

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

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

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

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

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

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

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

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

        srgid = (rgid == (compat_gid_t)-1) ? ((gid_t)-1) : ((gid_t)rgid);
        segid = (egid == (compat_gid_t)-1) ? ((gid_t)-1) : ((gid_t)egid);
        ssgid = (sgid == (compat_gid_t)-1) ? ((gid_t)-1) : ((gid_t)sgid);
        return sys_setresgid(srgid, segid, ssgid);
}
#endif /* NOTYET */