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

#include <asm/uaccess.h>
#include <asm/mman.h>
#include <asm/ipc.h>

extern asmlinkage long sys_socket(int family, int type, int protocol);
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_listen(int fd, int backlog);
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_socketpair(int family, int type, int protocol,
        int *usockvec);
extern asmlinkage long sys_send(int fd, void * buff, size_t len,
        unsigned flags);
extern asmlinkage long sys_sendto(int fd, void * buff, size_t len,
        unsigned flags, struct sockaddr *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, void * ubuf, size_t size,
        unsigned flags, struct sockaddr *addr, int *addr_len);
extern asmlinkage long sys_shutdown(int fd, int how);
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,
        char *optval, int *optlen);
extern asmlinkage long sys_sendmsg(int fd, struct msghdr *msg, unsigned flags);
extern asmlinkage long sys_recvmsg(int fd, struct msghdr *msg,
        unsigned int flags);


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

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

/*
 * Revalidate the inode. This is required for proper NFS attribute caching.
 */
static __inline__ int
do_revalidate(struct dentry *dentry)
{
        struct inode * inode = dentry->d_inode;

        if (inode->i_op && inode->i_op->revalidate)
                return inode->i_op->revalidate(dentry);

        return 0;
}

static int cp_new_stat32(struct inode * inode, struct stat32 * statbuf)
{
        struct stat32 tmp;
        unsigned int blocks, indirect;

        memset(&tmp, 0, sizeof(tmp));
        tmp.st_dev = kdev_t_to_nr(inode->i_dev);
        tmp.st_ino = inode->i_ino;
        tmp.st_mode = inode->i_mode;
        tmp.st_nlink = inode->i_nlink;
        SET_STAT_UID(tmp, inode->i_uid);
        SET_STAT_GID(tmp, inode->i_gid);
        tmp.st_rdev = kdev_t_to_nr(inode->i_rdev);
        tmp.st_size = inode->i_size;
        tmp.st_atime = inode->i_atime;
        tmp.st_mtime = inode->i_mtime;
        tmp.st_ctime = inode->i_ctime;

        /*
         * st_blocks and st_blksize are approximated with a simple algorithm if
         * they aren't supported directly by the filesystem. The minix and msdos
         * filesystems don't keep track of blocks, so they would either have to
         * be counted explicitly (by delving into the file itself), or by using
         * this simple algorithm to get a reasonable (although not 100%
         * accurate) value.
         */

        /*
         * Use minix fs values for the number of direct and indirect blocks.
         * The count is now exact for the minix fs except that it counts zero
         * blocks.  Everything is in units of BLOCK_SIZE until the assignment
         * to tmp.st_blksize.
         */
#define D_B   7
#define I_B   (BLOCK_SIZE / sizeof(unsigned short))

        if (!inode->i_blksize) {
                blocks = (tmp.st_size + BLOCK_SIZE - 1) / BLOCK_SIZE;
                if (blocks > D_B) {
                        indirect = (blocks - D_B + I_B - 1) / I_B;
                        blocks += indirect;
                        if (indirect > 1) {
                                indirect = (indirect - 1 + I_B - 1) / I_B;
                                blocks += indirect;
                                if (indirect > 1)
                                        blocks++;
                        }
                }
                tmp.st_blocks = (BLOCK_SIZE / 512) * blocks;
                tmp.st_blksize = BLOCK_SIZE;
        } else {
                tmp.st_blocks = inode->i_blocks;
                tmp.st_blksize = inode->i_blksize;
        }

        return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}

asmlinkage int sys32_newstat(char * filename, struct stat32 *statbuf)
{
        struct nameidata nd;
        int error;

        error = user_path_walk(filename, &nd);
        if (!error) {
                error = do_revalidate(nd.dentry);
                if (!error)
                        error = cp_new_stat32(nd.dentry->d_inode, statbuf);

                path_release(&nd);
        }

        return error;
}

asmlinkage int sys32_newlstat(char * filename, struct stat32 *statbuf)
{
        struct nameidata nd;
        int error;

        error = user_path_walk_link(filename, &nd);
        if (!error) {
                error = do_revalidate(nd.dentry);
                if (!error)
                        error = cp_new_stat32(nd.dentry->d_inode, statbuf);

                path_release(&nd);
        }

        return error;
}

asmlinkage long sys32_newfstat(unsigned int fd, struct stat32 * statbuf)
{
        struct file * f;
        int err = -EBADF;

        f = fget(fd);
        if (f) {
                struct dentry * dentry = f->f_dentry;

                err = do_revalidate(dentry);
                if (!err)
                        err = cp_new_stat32(dentry->d_inode, statbuf);
                fput(f);
        }

        return err;
}

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

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

        down_write(&current->mm->mmap_sem);
        error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
        up_write(&current->mm->mmap_sem);
        if (file)
                fput(file);

out:
        return error;
}


asmlinkage long sys_truncate(const char * path, unsigned long length);

asmlinkage int sys_truncate64(const char *path, unsigned int high,
                              unsigned int low)
{
        if ((int)high < 0)
                return -EINVAL;
        return sys_truncate(path, ((long) high << 32) | low);
}

asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length);

asmlinkage int sys_ftruncate64(unsigned int fd, unsigned int high,
                               unsigned int low)
{
        if ((int)high < 0)
                return -EINVAL;
        return sys_ftruncate(fd, ((long) high << 32) | low);
}

extern asmlinkage int sys_utime(char * filename, struct utimbuf * times);

struct utimbuf32 {
        __kernel_time_t32 actime, modtime;
};

asmlinkage int sys32_utime(char * filename, struct utimbuf32 *times)
{
        struct utimbuf t;
        mm_segment_t old_fs;
        int ret;
        char *filenam;

        if (!times)
                return sys_utime(filename, NULL);
        if (get_user (t.actime, &times->actime) ||
            __get_user (t.modtime, &times->modtime))
                return -EFAULT;
        filenam = getname (filename);
        ret = PTR_ERR(filenam);
        if (!IS_ERR(filenam)) {
                old_fs = get_fs();
                set_fs (KERNEL_DS);
                ret = sys_utime(filenam, &t);
                set_fs (old_fs);
                putname (filenam);
        }
        return ret;
}

#if 0
/*
 * count32() counts the number of arguments/envelopes
 */
static int count32(u32 * argv, int max)
{
        int i = 0;

        if (argv != NULL) {
                for (;;) {
                        u32 p; int error;

                        error = get_user(p,argv);
                        if (error)
                                return error;
                        if (!p)
                                break;
                        argv++;
                        if (++i > max)
                                return -E2BIG;
                }
        }
        return i;
}


/*
 * 'copy_strings32()' copies argument/envelope strings from user
 * memory to free pages in kernel mem. These are in a format ready
 * to be put directly into the top of new user memory.
 */
int copy_strings32(int argc, u32 * argv, struct linux_binprm *bprm)
{
        while (argc-- > 0) {
                u32 str;
                int len;
                unsigned long pos;

                if (get_user(str, argv+argc) || !str ||
                     !(len = strnlen_user((char *)A(str), bprm->p)))
                        return -EFAULT;
                if (bprm->p < len)
                        return -E2BIG;

                bprm->p -= len;
                /* XXX: add architecture specific overflow check here. */

                pos = bprm->p;
                while (len > 0) {
                        char *kaddr;
                        int i, new, err;
                        struct page *page;
                        int offset, bytes_to_copy;

                        offset = pos % PAGE_SIZE;
                        i = pos/PAGE_SIZE;
                        page = bprm->page[i];
                        new = 0;
                        if (!page) {
                                page = alloc_page(GFP_HIGHUSER);
                                bprm->page[i] = page;
                                if (!page)
                                        return -ENOMEM;
                                new = 1;
                        }
                        kaddr = kmap(page);

                        if (new && offset)
                                memset(kaddr, 0, offset);
                        bytes_to_copy = PAGE_SIZE - offset;
                        if (bytes_to_copy > len) {
                                bytes_to_copy = len;
                                if (new)
                                        memset(kaddr+offset+len, 0,
                                               PAGE_SIZE-offset-len);
                        }
                        err = copy_from_user(kaddr + offset, (char *)A(str),
                                             bytes_to_copy);
                        kunmap(page);

                        if (err)
                                return -EFAULT;

                        pos += bytes_to_copy;
                        str += bytes_to_copy;
                        len -= bytes_to_copy;
                }
        }
        return 0;
}


/*
 * sys_execve32() executes a new program.
 */
int do_execve32(char * filename, u32 * argv, u32 * envp, struct pt_regs * regs)
{
        struct linux_binprm bprm;
        struct dentry * dentry;
        int retval;
        int i;

        bprm.p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
        memset(bprm.page, 0, MAX_ARG_PAGES*sizeof(bprm.page[0]));

        dentry = open_namei(filename, 0, 0);
        retval = PTR_ERR(dentry);
        if (IS_ERR(dentry))
                return retval;

        bprm.dentry = dentry;
        bprm.filename = filename;
        bprm.sh_bang = 0;
        bprm.loader = 0;
        bprm.exec = 0;
        if ((bprm.argc = count32(argv, bprm.p / sizeof(u32))) < 0) {
                dput(dentry);
                return bprm.argc;
        }

        if ((bprm.envc = count32(envp, bprm.p / sizeof(u32))) < 0) {
                dput(dentry);
                return bprm.envc;
        }

        retval = prepare_binprm(&bprm);
        if (retval < 0)
                goto out;

        retval = copy_strings_kernel(1, &bprm.filename, &bprm);
        if (retval < 0)
                goto out;

        bprm.exec = bprm.p;
        retval = copy_strings32(bprm.envc, envp, &bprm);
        if (retval < 0)
                goto out;

        retval = copy_strings32(bprm.argc, argv, &bprm);
        if (retval < 0)
                goto out;

        retval = search_binary_handler(&bprm,regs);
        if (retval >= 0)
                /* execve success */
                return retval;

out:
        /* Something went wrong, return the inode and free the argument pages*/
        if (bprm.dentry)
                dput(bprm.dentry);

        /* Assumes that free_page() can take a NULL argument. */
        /* I hope this is ok for all architectures */
        for (i = 0 ; i < MAX_ARG_PAGES ; i++)
                if (bprm.page[i])
                        __free_page(bprm.page[i]);

        return retval;
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys32_execve(abi64_no_regargs, struct pt_regs regs)
{
        int error;
        char * filename;

        filename = getname((char *) (long)regs.regs[4]);
        printk("Executing: %s\n", filename);
        error = PTR_ERR(filename);
        if (IS_ERR(filename))
                goto out;
        error = do_execve32(filename, (u32 *) (long)regs.regs[5],
                          (u32 *) (long)regs.regs[6], &regs);
        putname(filename);

out:
        return error;
}
#else
static int nargs(unsigned int arg, char **ap)
{
        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 (ap)
                        *ap++ = (char *) A(addr);
                arg += sizeof(unsigned int);
                n++;
        } while (addr);
        return n - 1;
}

asmlinkage int
sys32_execve(abi64_no_regargs, struct pt_regs regs)
{
        extern asmlinkage int sys_execve(abi64_no_regargs, struct pt_regs regs);
        extern asmlinkage long sys_munmap(unsigned long addr, size_t len);
        unsigned int argv = (unsigned int)regs.regs[5];
        unsigned int envp = (unsigned int)regs.regs[6];
        char **av, **ae;
        int na, ne, r, len;
        char * filename;

        na = nargs(argv, NULL);
        if (na < 0)
                return na;
        ne = nargs(envp, NULL);
        if (ne < 0)
                return ne;
        len = (na + ne + 2) * sizeof(*av);

        /*
         *  kmalloc won't work because the `sys_exec' code will attempt
         *  to do a `get_user' on the arg list and `get_user' will fail
         *  on a kernel address (simplifies `get_user').  Instead we
         *  do an mmap to get a user address.  Note that since a successful
         *  `execve' frees all current memory we only have to do an
         *  `munmap' if the `execve' fails.
         */
        down_write(&current->mm->mmap_sem);
        av = (char **) do_mmap_pgoff(0, 0, len, PROT_READ | PROT_WRITE,
                                     MAP_PRIVATE | MAP_ANONYMOUS, 0);
        up_write(&current->mm->mmap_sem);

        if (IS_ERR(av))
                return (long) av;
        ae = av + na + 1;
        r = __put_user(0, (av + na));
        r |= __put_user(0, (ae + ne));
        if (r)
                goto out;
        r = nargs(argv, av);
        if (r < 0)
                goto out;
        r = nargs(envp, ae);
        if (r < 0)
                goto out;
        filename = getname((char *) (long)regs.regs[4]);
        r = PTR_ERR(filename);
        if (IS_ERR(filename))
                goto out;

        r = do_execve(filename, av, ae, &regs);
        putname(filename);
        if (r)
out:
                sys_munmap((unsigned long)av, len);
        return r ;
}
#endif

struct dirent32 {
        unsigned int    d_ino;
        unsigned int    d_off;
        unsigned short  d_reclen;
        char            d_name[NAME_MAX + 1];
};

static void
xlate_dirent(void *dirent64, void *dirent32, long n)
{
        long off;
        struct dirent *dirp;
        struct dirent32 *dirp32;

        off = 0;
        while (off < n) {
                dirp = (struct dirent *)(dirent64 + off);
                dirp32 = (struct dirent32 *)(dirent32 + off);
                off += dirp->d_reclen;
                dirp32->d_ino = dirp->d_ino;
                dirp32->d_off = (unsigned int)dirp->d_off;
                dirp32->d_reclen = dirp->d_reclen;
                strncpy(dirp32->d_name, dirp->d_name, dirp->d_reclen - ((3 * 4) + 2));
        }
        return;
}

asmlinkage long sys_getdents(unsigned int fd, void * dirent, unsigned int count);

asmlinkage long
sys32_getdents(unsigned int fd, void * dirent32, unsigned int count)
{
        long n;
        void *dirent64;

        dirent64 = (void *)((unsigned long)(dirent32 + (sizeof(long) - 1)) & ~(sizeof(long) - 1));
        if ((n = sys_getdents(fd, dirent64, count - (dirent64 - dirent32))) < 0)
                return(n);
        xlate_dirent(dirent64, dirent32, n);
        return(n);
}

asmlinkage int old_readdir(unsigned int fd, void * dirent, unsigned int count);

asmlinkage int
sys32_readdir(unsigned int fd, void * dirent32, unsigned int count)
{
        int n;
        struct dirent dirent64;

        if ((n = old_readdir(fd, &dirent64, count)) < 0)
                return(n);
        xlate_dirent(&dirent64, dirent32, dirent64.d_reclen);
        return(n);
}

struct timeval32
{
    int tv_sec, tv_usec;
};

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

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 (verify_area(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 int
sys32_wait4(__kernel_pid_t32 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 int
sys32_waitpid(__kernel_pid_t32 pid, unsigned int *stat_addr, int options)
{
        return sys32_wait4(pid, stat_addr, options, NULL);
}

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

extern asmlinkage int sys_sysinfo(struct sysinfo *info);

asmlinkage int sys32_sysinfo(struct sysinfo32 *info)
{
        struct sysinfo s;
        int ret, err;
        mm_segment_t old_fs = get_fs ();
        
        set_fs (KERNEL_DS);
        ret = sys_sysinfo(&s);
        set_fs (old_fs);
        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;
}

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

struct rlimit32 {
        int     rlim_cur;
        int     rlim_max;
};

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

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

        set_fs (KERNEL_DS);
        ret = sys_old_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;
}

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

asmlinkage int
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;
}

struct statfs32 {
        int     f_type;
        int     f_bsize;
        int     f_frsize;
        int     f_blocks;
        int     f_bfree;
        int     f_files;
        int     f_ffree;
        int     f_bavail;
        __kernel_fsid_t32       f_fsid;
        int     f_namelen;
        int     f_spare[6];
};

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

        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 int sys_statfs(const char * path, struct statfs * buf);

asmlinkage int
sys32_statfs(const char * path, struct statfs32 *buf)
{
        int ret;
        struct statfs s;
        mm_segment_t old_fs = get_fs();
        char *pth;
        
        pth = getname (path);
        ret = PTR_ERR(pth);
        if (!IS_ERR(pth)) {
                set_fs (KERNEL_DS);
                ret = sys_statfs((const char *)path, &s);
                set_fs (old_fs);
                if (!ret && put_statfs(buf, &s))
                        return -EFAULT;
        }
        return ret;
}

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

asmlinkage int
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;
}

#ifdef __MIPSEB__
asmlinkage long sys32_truncate64(const char * path, unsigned long __dummy,
        int length_hi, int length_lo)
#endif
#ifdef __MIPSEL__
asmlinkage long sys32_truncate64(const char * path, unsigned long __dummy,
        int length_lo, int length_hi)
#endif
{
        loff_t length;

        length = ((unsigned long) length_hi << 32) | (unsigned int) length_lo;

        return sys_truncate(path, length);
}

#ifdef __MIPSEB__
asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
        int length_hi, int length_lo)
#endif
#ifdef __MIPSEL__
asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
        int length_lo, int length_hi)
#endif
{
        loff_t length;

        length = ((unsigned long) length_hi << 32) | (unsigned int) length_lo;

        return sys_ftruncate(fd, length);
}

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

asmlinkage int
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;
}

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
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_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
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 int
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 int
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;
}

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


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

asmlinkage int
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 int
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);
}

extern asmlinkage long sys_llseek(unsigned int fd, unsigned long offset_high,
                                  unsigned long offset_low, loff_t * result,
                                  unsigned int origin);

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

struct iovec32 { unsigned int iov_base; int iov_len; };

typedef ssize_t (*IO_fn_t)(struct file *, char *, size_t, loff_t *);

static long
do_readv_writev32(int type, struct file *file, const struct iovec32 *vector,
                  u32 count)
{
        unsigned long tot_len;
        struct iovec iovstack[UIO_FASTIOV];
        struct iovec *iov=iovstack, *ivp;
        struct inode *inode;
        long retval, i;
        IO_fn_t fn;

        /* First get the "struct iovec" from user memory and
         * verify all the pointers
         */
        if (!count)
                return 0;
        if(verify_area(VERIFY_READ, vector, sizeof(struct iovec32)*count))
                return -EFAULT;
        if (count > UIO_MAXIOV)
                return -EINVAL;
        if (count > UIO_FASTIOV) {
                iov = kmalloc(count*sizeof(struct iovec), GFP_KERNEL);
                if (!iov)
                        return -ENOMEM;
        }

        tot_len = 0;
        i = count;
        ivp = iov;
        while (i > 0) {
                u32 len;
                u32 buf;

                __get_user(len, &vector->iov_len);
                __get_user(buf, &vector->iov_base);
                tot_len += len;
                ivp->iov_base = (void *)A(buf);
                ivp->iov_len = (__kernel_size_t) len;
                vector++;
                ivp++;
                i--;
        }

        inode = file->f_dentry->d_inode;
        /* VERIFY_WRITE actually means a read, as we write to user space */
        retval = locks_verify_area((type == VERIFY_WRITE
                                    ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE),
                                   inode, file, file->f_pos, tot_len);
        if (retval) {
                if (iov != iovstack)
                        kfree(iov);
                return retval;
        }

        /* Then do the actual IO.  Note that sockets need to be handled
         * specially as they have atomicity guarantees and can handle
         * iovec's natively
         */
        if (inode->i_sock) {
                int err;
                err = sock_readv_writev(type, inode, file, iov, count, tot_len);
                if (iov != iovstack)
                        kfree(iov);
                return err;
        }

        if (!file->f_op) {
                if (iov != iovstack)
                        kfree(iov);
                return -EINVAL;
        }
        /* VERIFY_WRITE actually means a read, as we write to user space */
        fn = file->f_op->read;
        if (type == VERIFY_READ)
                fn = (IO_fn_t) file->f_op->write;
        ivp = iov;
        while (count > 0) {
                void * base;
                int len, nr;

                base = ivp->iov_base;
                len = ivp->iov_len;
                ivp++;
                count--;
                nr = fn(file, base, len, &file->f_pos);
                if (nr < 0) {
                        if (retval)
                                break;
                        retval = nr;
                        break;
                }
                retval += nr;
                if (nr != len)
                        break;
        }
        if (iov != iovstack)
                kfree(iov);

        return retval;
}

asmlinkage long
sys32_readv(int fd, struct iovec32 *vector, u32 count)
{
        struct file *file;
        ssize_t ret;

        ret = -EBADF;
        file = fget(fd);
        if (!file)
                goto bad_file;
        if (file->f_op && (file->f_mode & FMODE_READ) &&
            (file->f_op->readv || file->f_op->read))
                ret = do_readv_writev32(VERIFY_WRITE, file, vector, count);

        fput(file);

bad_file:
        return ret;
}

asmlinkage long
sys32_writev(int fd, struct iovec32 *vector, u32 count)
{
        struct file *file;
        ssize_t ret;

        ret = -EBADF;
        file = fget(fd);
        if(!file)
                goto bad_file;
        if (file->f_op && (file->f_mode & FMODE_WRITE) &&
            (file->f_op->writev || file->f_op->write))
                ret = do_readv_writev32(VERIFY_READ, file, vector, count);
        fput(file);

bad_file:
        return ret;
}

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

asmlinkage ssize_t sys32_pread(unsigned int fd, char * buf,
                               size_t count, u32 unused, u64 a4, u64 a5)
{
        ssize_t ret;
        struct file * file;
        ssize_t (*read)(struct file *, char *, size_t, loff_t *);
        loff_t pos;

        ret = -EBADF;
        file = fget(fd);
        if (!file)
                goto bad_file;
        if (!(file->f_mode & FMODE_READ))
                goto out;
        pos = merge_64(a4, a5);
        ret = locks_verify_area(FLOCK_VERIFY_READ, file->f_dentry->d_inode,
                                file, pos, count);
        if (ret)
                goto out;
        ret = -EINVAL;
        if (!file->f_op || !(read = file->f_op->read))
                goto out;
        if (pos < 0)
                goto out;
        ret = read(file, buf, count, &pos);
        if (ret > 0)
                dnotify_parent(file->f_dentry, DN_ACCESS);
out:
        fput(file);
bad_file:
        return ret;
}

asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char * buf,
                                size_t count, u32 unused, u64 a4, u64 a5)
{
        ssize_t ret;
        struct file * file;
        ssize_t (*write)(struct file *, const char *, size_t, loff_t *);
        loff_t pos;

        ret = -EBADF;
        file = fget(fd);
        if (!file)
                goto bad_file;
        if (!(file->f_mode & FMODE_WRITE))
                goto out;
        pos = merge_64(a4, a5);
        ret = locks_verify_area(FLOCK_VERIFY_WRITE, file->f_dentry->d_inode,
                                file, pos, count);
        if (ret)
                goto out;
        ret = -EINVAL;
        if (!file->f_op || !(write = file->f_op->write))
                goto out;
        if (pos < 0)
                goto out;

        ret = write(file, buf, count, &pos);
        if (ret > 0)
                dnotify_parent(file->f_dentry, DN_MODIFY);
out:
        fput(file);
bad_file:
        return ret;
}
/*
 * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 * 64-bit unsigned longs.
 */

static inline int
get_fd_set32(unsigned long n, unsigned long *fdset, u32 *ufdset)
{
        if (ufdset) {
                unsigned long odd;

                if (verify_area(VERIFY_WRITE, ufdset, n*sizeof(u32)))
                        return -EFAULT;

                odd = n & 1UL;
                n &= ~1UL;
                while (n) {
                        unsigned long h, l;
                        __get_user(l, ufdset);
                        __get_user(h, ufdset+1);
                        ufdset += 2;
                        *fdset++ = h << 32 | l;
                        n -= 2;
                }
                if (odd)
                        __get_user(*fdset, ufdset);
        } else {
                /* Tricky, must clear full unsigned long in the
                 * kernel fdset at the end, this makes sure that
                 * actually happens.
                 */
                memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
        }
        return 0;
}

static inline void
set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
{
        unsigned long odd;

        if (!ufdset)
                return;

        odd = n & 1UL;
        n &= ~1UL;
        while (n) {
                unsigned long h, l;
                l = *fdset++;
                h = l >> 32;
                __put_user(l, ufdset);
                __put_user(h, ufdset+1);
                ufdset += 2;
                n -= 2;
        }
        if (odd)
                __put_user(*fdset, ufdset);
}

/*
 * 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)

asmlinkage int sys32_select(int n, u32 *inp, u32 *outp, u32 *exp, struct timeval32 *tvp)
{
        fd_set_bits fds;
        char *bits;
        unsigned long nn;
        long timeout;
        int ret, size;

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

                if ((ret = verify_area(VERIFY_READ, tvp, sizeof(*tvp)))
                    || (ret = __get_user(sec, &tvp->tv_sec))
                    || (ret = __get_user(usec, &tvp->tv_usec)))
                        goto out_nofds;

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

                if ((unsigned long) sec < MAX_SELECT_SECONDS) {
                        timeout = (usec + 1000000/HZ - 1) / (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);

        nn = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
        if ((ret = get_fd_set32(nn, fds.in, inp)) ||
            (ret = get_fd_set32(nn, fds.out, outp)) ||
            (ret = get_fd_set32(nn, fds.ex, exp)))
                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 (tvp && !(current->personality & STICKY_TIMEOUTS)) {
                time_t sec = 0, usec = 0;
                if (timeout) {
                        sec = timeout / HZ;
                        usec = timeout % HZ;
                        usec *= (1000000/HZ);
                }
                put_user(sec, &tvp->tv_sec);
                put_user(usec, &tvp->tv_usec);
        }

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

        set_fd_set32(nn, inp, fds.res_in);
        set_fd_set32(nn, outp, fds.res_out);
        set_fd_set32(nn, exp, fds.res_ex);

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



struct timespec32 {
        int     tv_sec;
        int     tv_nsec;
};

extern asmlinkage int sys_sched_rr_get_interval(pid_t pid,
                                                struct timespec *interval);

asmlinkage int
sys32_sched_rr_get_interval(__kernel_pid_t32 pid, struct timespec32 *interval)
{
        struct timespec t;
        int ret;
        mm_segment_t old_fs = get_fs ();

        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;
}


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

asmlinkage int
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 tms32 {
        int tms_utime;
        int tms_stime;
        int tms_cutime;
        int tms_cstime;
};

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

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

static int do_set_attach_filter(int fd, int level, int optname,
                                char *optval, int optlen)
{
        struct sock_fprog32 {
                __u16 len;
                __u32 filter;
        } *fprog32 = (struct sock_fprog32 *)optval;
        struct sock_fprog kfprog;
        struct sock_filter *kfilter;
        unsigned int fsize;
        mm_segment_t old_fs;
        __u32 uptr;
        int ret;

        if (get_user(kfprog.len, &fprog32->len) ||
            __get_user(uptr, &fprog32->filter))
                return -EFAULT;

        kfprog.filter = (struct sock_filter *)A(uptr);
        fsize = kfprog.len * sizeof(struct sock_filter);

        kfilter = (struct sock_filter *)kmalloc(fsize, GFP_KERNEL);
        if (kfilter == NULL)
                return -ENOMEM;

        if (copy_from_user(kfilter, kfprog.filter, fsize)) {
                kfree(kfilter);
                return -EFAULT;
        }

        kfprog.filter = kfilter;

        old_fs = get_fs();
        set_fs(KERNEL_DS);
        ret = sys_setsockopt(fd, level, optname,
                             (char *)&kfprog, sizeof(kfprog));
        set_fs(old_fs);

        kfree(kfilter);

        return ret;
}

static int do_set_icmpv6_filter(int fd, int level, int optname,
                                char *optval, int optlen)
{
        struct icmp6_filter kfilter;
        mm_segment_t old_fs;
        int ret, i;

        if (copy_from_user(&kfilter, optval, sizeof(kfilter)))
                return -EFAULT;


        for (i = 0; i < 8; i += 2) {
                u32 tmp = kfilter.data[i];

                kfilter.data[i] = kfilter.data[i + 1];
                kfilter.data[i + 1] = tmp;
        }

        old_fs = get_fs();
        set_fs(KERNEL_DS);
        ret = sys_setsockopt(fd, level, optname,
                             (char *) &kfilter, sizeof(kfilter));
        set_fs(old_fs);

        return ret;
}

asmlinkage int sys32_setsockopt(int fd, int level, int optname,
                                char *optval, int optlen)
{
        if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER)
                return do_set_attach_filter(fd, level, optname,
                                            optval, optlen);
        if (level == SOL_ICMPV6 && optname == ICMPV6_FILTER)
                return do_set_icmpv6_filter(fd, level, optname,
                                            optval, optlen);

        return sys_setsockopt(fd, level, optname, optval, optlen);
}

static inline int get_flock(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_flock(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(0, &ufl->l_sysid);
        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 long arg)
{
        switch (cmd) {
        case F_GETLK:
        case F_SETLK:
        case F_SETLKW:
                {
                        struct flock f;
                        mm_segment_t old_fs;
                        long ret;

                        if (get_flock(&f, (struct flock32 *)arg))
                                return -EFAULT;
                        old_fs = get_fs(); set_fs (KERNEL_DS);
                        ret = sys_fcntl(fd, cmd, (unsigned long)&f);
                        set_fs (old_fs);
                        if (put_flock(&f, (struct flock32 *)arg))
                                return -EFAULT;
                        return ret;
                }
        default:
                return sys_fcntl(fd, cmd, (unsigned long)arg);
        }
}

asmlinkage long
sys32_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
{
        switch (cmd) {
        case F_GETLK64:
                return sys_fcntl(fd, F_GETLK, arg);
        case F_SETLK64:
                return sys_fcntl(fd, F_SETLK, arg);
        case F_SETLKW64:
                return sys_fcntl(fd, F_SETLKW, arg);
        }

        return sys32_fcntl(fd, cmd, arg);
}

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_uid_t32 uid;
        __kernel_gid_t32 gid;
        __kernel_uid_t32 cuid;
        __kernel_gid_t32 cgid;
        __kernel_mode_t32 mode; 
        unsigned short seq;
        unsigned short __pad1;
        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;
        __kernel_time_t32 sem_ctime;
        unsigned int sem_nsems;
        unsigned int __unused1;
        unsigned int __unused2;
};

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;
        __kernel_time_t32 shm_dtime;
        __kernel_time_t32 shm_ctime;
        __kernel_pid_t32 shm_cpid;
        __kernel_pid_t32 shm_lpid;
        unsigned int shm_nattch;
        unsigned int __unused1;
        unsigned int __unused2;
};

struct ipc_kludge32 {
        u32 msgp;
        s32 msgtyp;
};

static int
do_sys32_semctl(int first, int second, int third, void *uptr)
{
        union semun fourth;
        u32 pad;
        int err, err2;
        struct semid64_ds s;
        mm_segment_t old_fs;

        if (!uptr)
                return -EINVAL;
        err = -EFAULT;
        if (get_user (pad, (u32 *)uptr))
                return err;
        if ((third & ~IPC_64) == SETVAL)
                fourth.val = (int)pad;
        else
                fourth.__pad = (void *)A(pad);
        switch (third & ~IPC_64) {
        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 | IPC_64, fourth);
                set_fs(old_fs);

                if (third & 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;

        default:
                err = - EINVAL;
                break;
        }

        return err;
}

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

        if (second < 0)
                return -EINVAL;
        p = kmalloc (second + sizeof (struct msgbuf)
                                    + 4, GFP_USER);
        if (!p)
                return -ENOMEM;
        err = get_user (p->mtype, &up->mtype);
        if (err)
                goto out;
        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_kludge32 *uipck = (struct ipc_kludge32 *)uptr;
                struct ipc_kludge32 ipck;

                err = -EINVAL;
                if (!uptr)
                        goto out;
                err = -EFAULT;
                if (copy_from_user (&ipck, uipck, sizeof (struct ipc_kludge32)))
                        goto out;
                uptr = (void *)AA(ipck.msgp);
                msgtyp = ipck.msgtyp;
        }

        if (second < 0)
                return -EINVAL;
        err = -ENOMEM;
        p = kmalloc (second + sizeof (struct msgbuf) + 4, GFP_USER);
        if (!p)
                goto out;
        old_fs = get_fs ();
        set_fs (KERNEL_DS);
        err = sys_msgrcv (first, p, second + 4, 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
do_sys32_msgctl (int first, int second, void *uptr)
{
        int err = -EINVAL, err2;
        struct msqid64_ds m;
        struct msqid_ds32 *up32 = (struct msqid_ds32 *)uptr;
        struct msqid64_ds32 *up64 = (struct msqid64_ds32 *)uptr;
        mm_segment_t old_fs;

        switch (second & ~IPC_64) {
        case IPC_INFO:
        case IPC_RMID:
        case MSG_INFO:
                err = sys_msgctl (first, second, (struct msqid_ds *)uptr);
                break;

        case IPC_SET:
                if (second & IPC_64) {
                        if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) {
                                err = -EFAULT;
                                break;
                        }
                        err = __get_user(m.msg_perm.uid, &up64->msg_perm.uid);
                        err |= __get_user(m.msg_perm.gid, &up64->msg_perm.gid);
                        err |= __get_user(m.msg_perm.mode, &up64->msg_perm.mode);
                        err |= __get_user(m.msg_qbytes, &up64->msg_qbytes);
                } else {
                        if (!access_ok(VERIFY_READ, up32, sizeof(*up32))) {
                                err = -EFAULT;
                                break;
                        }
                        err = __get_user(m.msg_perm.uid, &up32->msg_perm.uid);
                        err |= __get_user(m.msg_perm.gid, &up32->msg_perm.gid);
                        err |= __get_user(m.msg_perm.mode, &up32->msg_perm.mode);
                        err |= __get_user(m.msg_qbytes, &up32->msg_qbytes);
                }
                if (err)
                        break;
                old_fs = get_fs();
                set_fs(KERNEL_DS);
                err = sys_msgctl(first, second | IPC_64, (struct msqid_ds *)&m);
                set_fs(old_fs);
                break;

        case IPC_STAT:
        case MSG_STAT:
                old_fs = get_fs();
                set_fs(KERNEL_DS);
                err = sys_msgctl(first, second | IPC_64, (struct msqid_ds *)&m);
                set_fs(old_fs);
                if (second & IPC_64) {
                        if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) {
                                err = -EFAULT;
                                break;
                        }
                        err2 = __put_user(m.msg_perm.key, &up64->msg_perm.key);
                        err2 |= __put_user(m.msg_perm.uid, &up64->msg_perm.uid);
                        err2 |= __put_user(m.msg_perm.gid, &up64->msg_perm.gid);
                        err2 |= __put_user(m.msg_perm.cuid, &up64->msg_perm.cuid);
                        err2 |= __put_user(m.msg_perm.cgid, &up64->msg_perm.cgid);
                        err2 |= __put_user(m.msg_perm.mode, &up64->msg_perm.mode);
                        err2 |= __put_user(m.msg_perm.seq, &up64->msg_perm.seq);
                        err2 |= __put_user(m.msg_stime, &up64->msg_stime);
                        err2 |= __put_user(m.msg_rtime, &up64->msg_rtime);
                        err2 |= __put_user(m.msg_ctime, &up64->msg_ctime);
                        err2 |= __put_user(m.msg_cbytes, &up64->msg_cbytes);
                        err2 |= __put_user(m.msg_qnum, &up64->msg_qnum);
                        err2 |= __put_user(m.msg_qbytes, &up64->msg_qbytes);
                        err2 |= __put_user(m.msg_lspid, &up64->msg_lspid);
                        err2 |= __put_user(m.msg_lrpid, &up64->msg_lrpid);
                        if (err2)

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

        return err;
}

static int
do_sys32_shmat (int first, int second, int third, int version, void *uptr)
{
        unsigned long raddr;
        u32 *uaddr = (u32 *)A((u32)third);
        int err = -EINVAL;

        if (version == 1)
                return err;
        err = sys_shmat (first, uptr, second, &raddr);
        if (err)
                return err;
        err = put_user (raddr, uaddr);
        return err;
}

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

static int
do_sys32_shmctl (int first, int second, void *uptr)
{
        struct shmid64_ds32 *up64 = (struct shmid64_ds32 *)uptr;
        struct shmid_ds32 *up32 = (struct shmid_ds32 *)uptr;
        struct shm_info32 *uip = (struct shm_info32 *)uptr;
        int err = -EFAULT, err2;
        struct shmid64_ds s64;
        mm_segment_t old_fs;
        struct shm_info si;
        struct shmid_ds s;

        switch (second & ~IPC_64) {
        case IPC_INFO:
                second = IPC_INFO; /* So that we don't have to translate it */
        case IPC_RMID:
        case SHM_LOCK:
        case SHM_UNLOCK:
                err = sys_shmctl(first, second, (struct shmid_ds *)uptr);
                break;
        case IPC_SET:
                if (second & IPC_64) {
                        err = get_user(s.shm_perm.uid, &up64->shm_perm.uid);
                        err |= get_user(s.shm_perm.gid, &up64->shm_perm.gid);
                        err |= get_user(s.shm_perm.mode, &up64->shm_perm.mode);
                } else {
                        err = get_user(s.shm_perm.uid, &up32->shm_perm.uid);
                        err |= get_user(s.shm_perm.gid, &up32->shm_perm.gid);
                        err |= get_user(s.shm_perm.mode, &up32->shm_perm.mode);
                }
                if (err)
                        break;
                old_fs = get_fs();
                set_fs(KERNEL_DS);
                err = sys_shmctl(first, second & ~IPC_64, &s);
                set_fs(old_fs);
                break;

        case IPC_STAT:
        case SHM_STAT:
                old_fs = get_fs();
                set_fs(KERNEL_DS);
                err = sys_shmctl(first, second | IPC_64, (void *) &s64);
                set_fs(old_fs);
                if (err < 0)
                        break;
                if (second & 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;
                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;

        default:
                err = -EINVAL;
                break;
        }

        return err;
}

static inline void *alloc_user_space(long len)
{
        unsigned long sp = (unsigned long) current + THREAD_SIZE - 32;
 
        return (void *) (sp - len);
}

static int sys32_semtimedop(int semid, struct sembuf *tsems, int nsems,
                            const struct timespec32 *timeout32)
{
        struct timespec32 t32;
        struct timespec *t64 = alloc_user_space(sizeof(*t64));

        if (copy_from_user(&t32, timeout32, sizeof(t32)))
                return -EFAULT;
                                                                                
        if (put_user(t32.tv_sec, &t64->tv_sec) ||
            put_user(t32.tv_nsec, &t64->tv_nsec))
                return -EFAULT;

        return sys_semtimedop(semid, tsems, nsems, t64);
}

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

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

        switch (call) {

        case SEMOP:
                /* struct sembuf is the same on 32 and 64bit :)) */
                err = sys_semtimedop (first, (struct sembuf *)AA(ptr),
                                      second, NULL);
                break;
        case SEMTIMEDOP:
                err = sys32_semtimedop(first, (struct sembuf *)AA(ptr), second,
                                       (const struct timespec32 *) AA(fifth));
                break;
        case SEMGET:
                err = sys_semget (first, second, third);
                break;
        case SEMCTL:
                err = do_sys32_semctl (first, second, third,
                                       (void *)AA(ptr));
                break;

        case MSGSND:
                err = do_sys32_msgsnd (first, second, third,
                                       (void *)AA(ptr));
                break;
        case MSGRCV:
                err = do_sys32_msgrcv (first, second, fifth, third,
                                       version, (void *)AA(ptr));
                break;
        case MSGGET:
                err = sys_msgget ((key_t) first, second);
                break;
        case MSGCTL:
                err = do_sys32_msgctl (first, second, (void *)AA(ptr));
                break;

        case SHMAT:
                err = do_sys32_shmat (first, second, third,
                                      version, (void *)AA(ptr));
                break;
        case SHMDT:
                err = sys_shmdt ((char *)A(ptr));
                break;
        case SHMGET:
                err = sys_shmget (first, second, third);
                break;
        case SHMCTL:
                err = do_sys32_shmctl (first, second, (void *)AA(ptr));
                break;
        default:
                err = -EINVAL;
                break;
        }

        return err;
}

struct sysctl_args32
{
        __kernel_caddr_t32 name;
        int nlen;
        __kernel_caddr_t32 oldval;
        __kernel_caddr_t32 oldlenp;
        __kernel_caddr_t32 newval;
        __kernel_size_t32 newlen;
        unsigned int __unused[4];
};

#ifdef CONFIG_SYSCTL

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

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

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

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

#else /* CONFIG_SYSCTL */

asmlinkage long sys32_sysctl(struct sysctl_args32 *args)
{
        return -ENOSYS;
}

#endif /* CONFIG_SYSCTL */

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

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

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

        return ret;
}

extern asmlinkage long sys_personality(unsigned long);

asmlinkage int sys32_personality(unsigned long personality)
{
        int 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;
}

/* ustat compatibility */
struct ustat32 {
        __kernel_daddr_t32      f_tfree;
        __kernel_ino_t32        f_tinode;
        char                    f_fname[6];
        char                    f_fpack[6];
};

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

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

        set_fs(KERNEL_DS);
        err = sys_ustat(dev, &tmp);
        set_fs (old_fs);

        if (err)
                goto out;

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

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

out:
        return err;
}

/* 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 int 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;
}

/*
 *  Declare the 32-bit 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)

__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;
}

__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 iov_from_user32_to_kern(struct iovec *kiov,
                                          struct iovec32 *uiov32,
                                          int niov)
{
        int tot_len = 0;

        while(niov > 0) {
                u32 len, buf;

                if(get_user(len, &uiov32->iov_len) ||
                   get_user(buf, &uiov32->iov_base)) {
                        tot_len = -EFAULT;
                        break;
                }
                tot_len += len;
                kiov->iov_base = (void *)AA(buf);
                kiov->iov_len = (__kernel_size_t) len;
                uiov32++;
                kiov++;
                niov--;
        }
        return tot_len;
}

static inline int msghdr_from_user32_to_kern(struct msghdr *kmsg,
                                             struct msghdr32 *umsg)
{
        u32 tmp1, tmp2, tmp3;
        int err;

        err = get_user(tmp1, &umsg->msg_name);
        err |= __get_user(tmp2, &umsg->msg_iov);
        err |= __get_user(tmp3, &umsg->msg_control);
        if (err)
                return -EFAULT;

        kmsg->msg_name = (void *)AA(tmp1);
        kmsg->msg_iov = (struct iovec *)AA(tmp2);
        kmsg->msg_control = (void *)AA(tmp3);

        err = get_user(kmsg->msg_namelen, &umsg->msg_namelen);
        err |= get_user(kmsg->msg_iovlen, &umsg->msg_iovlen);
        err |= get_user(kmsg->msg_controllen, &umsg->msg_controllen);
        err |= get_user(kmsg->msg_flags, &umsg->msg_flags);
        
        return err;
}

/* I've named the args so it is easy to tell whose space the pointers are in. */
static int verify_iovec32(struct msghdr *kern_msg, struct iovec *kern_iov,
                          char *kern_address, int mode)
{
        int tot_len;

        if(kern_msg->msg_namelen) {
                if(mode==VERIFY_READ) {
                        int err = move_addr_to_kernel(kern_msg->msg_name,
                                                      kern_msg->msg_namelen,
                                                      kern_address);
                        if(err < 0)
                                return err;
                }
                kern_msg->msg_name = kern_address;
        } else
                kern_msg->msg_name = NULL;

        if(kern_msg->msg_iovlen > UIO_FASTIOV) {
                kern_iov = kmalloc(kern_msg->msg_iovlen * sizeof(struct iovec),
                                   GFP_KERNEL);
                if(!kern_iov)
                        return -ENOMEM;
        }

        tot_len = iov_from_user32_to_kern(kern_iov,
                                          (struct iovec32 *)kern_msg->msg_iov,
                                          kern_msg->msg_iovlen);
        if(tot_len >= 0)
                kern_msg->msg_iov = kern_iov;
        else if(kern_msg->msg_iovlen > UIO_FASTIOV)
                kfree(kern_iov);

        return tot_len;
}

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);

/* 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 cmsghdr_from_user32_to_kern(struct msghdr *kmsg,
                                       unsigned char *stackbuf, int stackbuf_size)
{
        struct cmsghdr32 *ucmsg;
        struct cmsghdr *kcmsg, *kcmsg_base;
        __kernel_size_t32 ucmlen;
        __kernel_size_t kcmlen, tmp;

        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_ALIGN(ucmlen) <
                   CMSG32_ALIGN(sizeof(struct cmsghdr32)))
                        return -ENOBUFS;
                if((unsigned long)(((char *)ucmsg - (char *)kmsg->msg_control)
                                   + ucmlen) > kmsg->msg_controllen)
                        return -EINVAL;

                tmp = ((ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))) +
                       CMSG_ALIGN(sizeof(struct cmsghdr)));
                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 > stackbuf_size)
                kcmsg_base = kcmsg = kmalloc(kcmlen, GFP_KERNEL);
        if(kcmsg == NULL)
                return -ENOBUFS;

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

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

                /* Advance. */
                kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(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)
                kfree(kcmsg_base);
        return -EFAULT;
}

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]);
                fd_install(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)
{
        unsigned char *workbuf, *wp;
        unsigned long bufsz, space_avail;
        struct cmsghdr *ucmsg;

        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) - sizeof(struct cmsghdr))) {
                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.
                 */
                __get_user(kcmsg32->cmsg_len, &ucmsg->cmsg_len);
                __get_user(kcmsg32->cmsg_level, &ucmsg->cmsg_level);
                __get_user(kcmsg32->cmsg_type, &ucmsg->cmsg_type);

                clen64 = kcmsg32->cmsg_len;
                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);
        copy_to_user((void *)orig_cmsg_uptr, workbuf, bufsz);

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

        kfree(workbuf);
        return;

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;
}

asmlinkage int sys32_sendmsg(int fd, struct msghdr32 *user_msg, unsigned user_flags)
{
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        struct iovec iov[UIO_FASTIOV];
        unsigned char ctl[sizeof(struct cmsghdr) + 20];
        unsigned char *ctl_buf = ctl;
        struct msghdr kern_msg;
        int err, total_len;

        if(msghdr_from_user32_to_kern(&kern_msg, user_msg))
                return -EFAULT;
        if(kern_msg.msg_iovlen > UIO_MAXIOV)
                return -EINVAL;
        err = verify_iovec32(&kern_msg, iov, address, VERIFY_READ);
        if (err < 0)
                goto out;
        total_len = err;

        if(kern_msg.msg_controllen) {
                err = cmsghdr_from_user32_to_kern(&kern_msg, ctl, sizeof(ctl));
                if(err)
                        goto out_freeiov;
                ctl_buf = kern_msg.msg_control;
        }
        kern_msg.msg_flags = user_flags;

        sock = sockfd_lookup(fd, &err);
        if (sock != NULL) {
                if (sock->file->f_flags & O_NONBLOCK)
                        kern_msg.msg_flags |= MSG_DONTWAIT;
                err = sock_sendmsg(sock, &kern_msg, total_len);
                sockfd_put(sock);
        }

        /* N.B. Use kfree here, as kern_msg.msg_controllen might change? */
        if(ctl_buf != ctl)
                kfree(ctl_buf);
out_freeiov:
        if(kern_msg.msg_iov != iov)
                kfree(kern_msg.msg_iov);
out:
        return err;
}

asmlinkage int sys32_recvmsg(int fd, struct msghdr32 *user_msg, unsigned int user_flags)
{
        struct iovec iovstack[UIO_FASTIOV];
        struct msghdr kern_msg;
        char addr[MAX_SOCK_ADDR];
        struct socket *sock;
        struct iovec *iov = iovstack;
        struct sockaddr *uaddr;
        int *uaddr_len;
        unsigned long cmsg_ptr;
        int err, total_len, len = 0;

        if(msghdr_from_user32_to_kern(&kern_msg, user_msg))
                return -EFAULT;
        if(kern_msg.msg_iovlen > UIO_MAXIOV)
                return -EINVAL;

        uaddr = kern_msg.msg_name;
        uaddr_len = &user_msg->msg_namelen;
        err = verify_iovec32(&kern_msg, iov, addr, VERIFY_WRITE);
        if (err < 0)
                goto out;
        total_len = err;

        cmsg_ptr = (unsigned long) kern_msg.msg_control;
        kern_msg.msg_flags = 0;

        sock = sockfd_lookup(fd, &err);
        if (sock != NULL) {
                struct scm_cookie scm;

                if (sock->file->f_flags & O_NONBLOCK)
                        user_flags |= MSG_DONTWAIT;
                memset(&scm, 0, sizeof(scm));
                err = sock->ops->recvmsg(sock, &kern_msg, total_len,
                                         user_flags, &scm);
                if(err >= 0) {
                        len = err;
                        if(!kern_msg.msg_control) {
                                if(sock->passcred || scm.fp)
                                        kern_msg.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) kern_msg.msg_control != cmsg_ptr)
                                        cmsg32_recvmsg_fixup(&kern_msg, cmsg_ptr);

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

        if(uaddr != NULL && kern_msg.msg_namelen && err >= 0)
                err = move_addr_to_user(addr, kern_msg.msg_namelen, uaddr, uaddr_len);
        if(cmsg_ptr != 0 && err >= 0) {
                unsigned long ucmsg_ptr = ((unsigned long)kern_msg.msg_control);
                __kernel_size_t32 uclen = (__kernel_size_t32) (ucmsg_ptr - cmsg_ptr);
                err |= __put_user(uclen, &user_msg->msg_controllen);
        }
        if(err >= 0)
                err = __put_user(kern_msg.msg_flags, &user_msg->msg_flags);
        if(kern_msg.msg_iov != iov)
                kfree(kern_msg.msg_iov);
out:
        if(err < 0)
                return err;
        return len;
}

extern asmlinkage ssize_t sys_sendfile(int out_fd, int in_fd, off_t *offset, size_t count);

asmlinkage int sys32_sendfile(int out_fd, int in_fd, __kernel_off_t32 *offset, s32 count)
{
        mm_segment_t old_fs = get_fs();
        int ret;
        off_t of;
        
        if (offset && get_user(of, offset))
                return -EFAULT;
                
        set_fs(KERNEL_DS);
        ret = sys_sendfile(out_fd, in_fd, offset ? &of : NULL, count);
        set_fs(old_fs);
        
        if (offset && put_user(of, offset))
                return -EFAULT;
                
        return ret;
}

asmlinkage ssize_t sys_readahead(int fd, loff_t offset, size_t count);

asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,