/*
 * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
 *             sys_sparc32
 *
 * Copyright (C) 2000           VA Linux Co
 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2000           Hewlett-Packard Co.
 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment. In 2.5 most of this should be moved to a generic directory.
 *
 * This file assumes that there is a hole at the end of user address space.
 *
 * Some of the functions are LE specific currently. These are
 * hopefully all marked.  This should be fixed.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/mm.h>
#include <linux/uio.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/rwsem.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/highuid.h>
#include <linux/sysctl.h>
#include <linux/slab.h>
#include <asm/mman.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#include <linux/atomic.h>
#include <asm/vgtod.h>
#include <asm/sys_ia32.h>

#define AA(__x)         ((unsigned long)(__x))


asmlinkage long sys32_truncate64(const char __user *filename,
                                 unsigned long offset_low,
                                 unsigned long offset_high)
{
       return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
                                  unsigned long offset_high)
{
       return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
}

/*
 * Another set for IA32/LFS -- x86_64 struct stat is different due to
 * support for 64bit inode numbers.
 */
static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
{
        typeof(ubuf->st_uid) uid = 0;
        typeof(ubuf->st_gid) gid = 0;
        SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
        SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
        if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
            __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
            __put_user(stat->ino, &ubuf->__st_ino) ||
            __put_user(stat->ino, &ubuf->st_ino) ||
            __put_user(stat->mode, &ubuf->st_mode) ||
            __put_user(stat->nlink, &ubuf->st_nlink) ||
            __put_user(uid, &ubuf->st_uid) ||
            __put_user(gid, &ubuf->st_gid) ||
            __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
            __put_user(stat->size, &ubuf->st_size) ||
            __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
            __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
            __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
            __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
            __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
            __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
            __put_user(stat->blksize, &ubuf->st_blksize) ||
            __put_user(stat->blocks, &ubuf->st_blocks))
                return -EFAULT;
        return 0;
}

asmlinkage long sys32_stat64(const char __user *filename,
                             struct stat64 __user *statbuf)
{
        struct kstat stat;
        int ret = vfs_stat(filename, &stat);

        if (!ret)
                ret = cp_stat64(statbuf, &stat);
        return ret;
}

asmlinkage long sys32_lstat64(const char __user *filename,
                              struct stat64 __user *statbuf)
{
        struct kstat stat;
        int ret = vfs_lstat(filename, &stat);
        if (!ret)
                ret = cp_stat64(statbuf, &stat);
        return ret;
}

asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
{
        struct kstat stat;
        int ret = vfs_fstat(fd, &stat);
        if (!ret)
                ret = cp_stat64(statbuf, &stat);
        return ret;
}

asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename,
                              struct stat64 __user *statbuf, int flag)
{
        struct kstat stat;
        int error;

        error = vfs_fstatat(dfd, filename, &stat, flag);
        if (error)
                return error;
        return cp_stat64(statbuf, &stat);
}

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

struct mmap_arg_struct32 {
        unsigned int addr;
        unsigned int len;
        unsigned int prot;
        unsigned int flags;
        unsigned int fd;
        unsigned int offset;
};

asmlinkage long sys32_mmap(struct mmap_arg_struct32 __user *arg)
{
        struct mmap_arg_struct32 a;

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

        if (a.offset & ~PAGE_MASK)
                return -EINVAL;

        return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
                               a.offset>>PAGE_SHIFT);
}

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

/* warning: next two assume little endian */
asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
                            u32 poslo, u32 poshi)
{
        return sys_pread64(fd, ubuf, count,
                         ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf,
                             u32 count, u32 poslo, u32 poshi)
{
        return sys_pwrite64(fd, ubuf, count,
                          ((loff_t)AA(poshi) << 32) | AA(poslo));
}


/*
 * Some system calls that need sign extended arguments. This could be
 * done by a generic wrapper.
 */
long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
                        __u32 len_low, __u32 len_high, int advice)
{
        return sys_fadvise64_64(fd,
                               (((u64)offset_high)<<32) | offset_low,
                               (((u64)len_high)<<32) | len_low,
                                advice);
}

asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
                                   size_t count)
{
        return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
}

asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
                                      unsigned n_low, unsigned n_hi,  int flags)
{
        return sys_sync_file_range(fd,
                                   ((u64)off_hi << 32) | off_low,
                                   ((u64)n_hi << 32) | n_low, flags);
}

asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
                                size_t len, int advice)
{
        return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
                                len, advice);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
                                unsigned offset_hi, unsigned len_lo,
                                unsigned len_hi)
{
        return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
                             ((u64)len_hi << 32) | len_lo);
}