arch/x86/ia32/sys_ia32.c - kernel/msm-4.9 - Gitiles

 /*
  * 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/smp_lock.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 <asm/atomic.h>
 #include <asm/vgtod.h>
 #include <asm/sys_ia32.h>

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


 asmlinkage long sys32_truncate64(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, stat->uid);
 	SET_GID(gid, 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(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(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, 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_mprotect(unsigned long start, size_t len,
 			       unsigned long prot)
 {
 	return sys_mprotect(start, len, prot);
 }

 asmlinkage long sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
 				   struct sigaction32 __user *oact,
 				   unsigned int sigsetsize)
 {
 	struct k_sigaction new_ka, old_ka;
 	int ret;
 	compat_sigset_t set32;

 	/* XXX: Don't preclude handling different sized sigset_t's.  */
 	if (sigsetsize != sizeof(compat_sigset_t))
 		return -EINVAL;

 	if (act) {
 		compat_uptr_t handler, restorer;

 		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 		    __get_user(handler, &act->sa_handler) ||
 		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 		    __get_user(restorer, &act->sa_restorer) ||
 		    __copy_from_user(&set32, &act->sa_mask,
 				     sizeof(compat_sigset_t)))
 			return -EFAULT;
 		new_ka.sa.sa_handler = compat_ptr(handler);
 		new_ka.sa.sa_restorer = compat_ptr(restorer);

 		/*
 		 * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
 		 * than _NSIG_WORDS << 1
 		 */
 		switch (_NSIG_WORDS) {
 		case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
 				| (((long)set32.sig[7]) << 32);
 		case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
 				| (((long)set32.sig[5]) << 32);
 		case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
 				| (((long)set32.sig[3]) << 32);
 		case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
 				| (((long)set32.sig[1]) << 32);
 		}
 	}

 	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

 	if (!ret && oact) {
 		/*
 		 * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
 		 * than _NSIG_WORDS << 1
 		 */
 		switch (_NSIG_WORDS) {
 		case 4:
 			set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
 			set32.sig[6] = old_ka.sa.sa_mask.sig[3];
 		case 3:
 			set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
 			set32.sig[4] = old_ka.sa.sa_mask.sig[2];
 		case 2:
 			set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
 			set32.sig[2] = old_ka.sa.sa_mask.sig[1];
 		case 1:
 			set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
 			set32.sig[0] = old_ka.sa.sa_mask.sig[0];
 		}
 		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 		    __put_user(ptr_to_compat(old_ka.sa.sa_handler),
 			       &oact->sa_handler) ||
 		    __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
 			       &oact->sa_restorer) ||
 		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 		    __copy_to_user(&oact->sa_mask, &set32,
 				   sizeof(compat_sigset_t)))
 			return -EFAULT;
 	}

 	return ret;
 }

 asmlinkage long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
 				struct old_sigaction32 __user *oact)
 {
 	struct k_sigaction new_ka, old_ka;
 	int ret;

 	if (act) {
 		compat_old_sigset_t mask;
 		compat_uptr_t handler, restorer;

 		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 		    __get_user(handler, &act->sa_handler) ||
 		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 		    __get_user(restorer, &act->sa_restorer) ||
 		    __get_user(mask, &act->sa_mask))
 			return -EFAULT;

 		new_ka.sa.sa_handler = compat_ptr(handler);
 		new_ka.sa.sa_restorer = compat_ptr(restorer);

 		siginitset(&new_ka.sa.sa_mask, mask);
 	}

 	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

 	if (!ret && oact) {
 		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 		    __put_user(ptr_to_compat(old_ka.sa.sa_handler),
 			       &oact->sa_handler) ||
 		    __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
 			       &oact->sa_restorer) ||
 		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 			return -EFAULT;
 	}

 	return ret;
 }

 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 				     compat_sigset_t __user *oset,
 				     unsigned int sigsetsize)
 {
 	sigset_t s;
 	compat_sigset_t s32;
 	int ret;
 	mm_segment_t old_fs = get_fs();

 	if (set) {
 		if (copy_from_user(&s32, set, sizeof(compat_sigset_t)))
 			return -EFAULT;
 		switch (_NSIG_WORDS) {
 		case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
 		case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
 		case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
 		case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 		}
 	}
 	set_fs(KERNEL_DS);
 	ret = sys_rt_sigprocmask(how,
 				 set ? (sigset_t __user *)&s : NULL,
 				 oset ? (sigset_t __user *)&s : NULL,
 				 sigsetsize);
 	set_fs(old_fs);
 	if (ret)
 		return ret;
 	if (oset) {
 		switch (_NSIG_WORDS) {
 		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 		}
 		if (copy_to_user(oset, &s32, sizeof(compat_sigset_t)))
 			return -EFAULT;
 	}
 	return 0;
 }

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

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

 /* 32-bit timeval and related flotsam.  */

 asmlinkage long sys32_sysfs(int option, u32 arg1, u32 arg2)
 {
 	return sys_sysfs(option, arg1, arg2);
 }

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

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

 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 				    compat_size_t sigsetsize)
 {
 	sigset_t s;
 	compat_sigset_t s32;
 	int ret;
 	mm_segment_t old_fs = get_fs();

 	set_fs(KERNEL_DS);
 	ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
 	set_fs(old_fs);
 	if (!ret) {
 		switch (_NSIG_WORDS) {
 		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 		}
 		if (copy_to_user(set, &s32, sizeof(compat_sigset_t)))
 			return -EFAULT;
 	}
 	return ret;
 }

 asmlinkage long sys32_rt_sigqueueinfo(int pid, int sig,
 				      compat_siginfo_t __user *uinfo)
 {
 	siginfo_t info;
 	int ret;
 	mm_segment_t old_fs = get_fs();

 	if (copy_siginfo_from_user32(&info, uinfo))
 		return -EFAULT;
 	set_fs(KERNEL_DS);
 	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
 	set_fs(old_fs);
 	return ret;
 }

 /* 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, char __user *ubuf, u32 count,
 			     u32 poslo, u32 poshi)
 {
 	return sys_pwrite64(fd, ubuf, count,
 			  ((loff_t)AA(poshi) << 32) | AA(poslo));
 }


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

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

 asmlinkage long sys32_sendfile(int out_fd, int in_fd,
 			       compat_off_t __user *offset, s32 count)
 {
 	mm_segment_t old_fs = get_fs();
 	int ret;
 	off_t of;

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

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

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

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

 	filename = getname(name);
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		return error;
 	error = compat_do_execve(filename, argv, envp, regs);
 	putname(filename);
 	return error;
 }

 asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
 			    struct pt_regs *regs)
 {
 	void __user *parent_tid = (void __user *)regs->dx;
 	void __user *child_tid = (void __user *)regs->di;

 	if (!newsp)
 		newsp = regs->sp;
 	return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
 }

 /*
  * Some system calls that need sign extended arguments. This could be
  * done by a generic wrapper.
  */
 long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
 {
 	return sys_lseek(fd, offset, whence);
 }

 long sys32_kill(int pid, int sig)
 {
 	return sys_kill(pid, sig);
 }

 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);
 }

 long sys32_vm86_warning(void)
 {
 	struct task_struct *me = current;
 	static char lastcomm[sizeof(me->comm)];

 	if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
 		compat_printk(KERN_INFO
 			      "%s: vm86 mode not supported on 64 bit kernel\n",
 			      me->comm);
 		strncpy(lastcomm, me->comm, sizeof(lastcomm));
 	}
 	return -ENOSYS;
 }

 long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
 			  char __user *buf, size_t len)
 {
 	return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
 }

 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);
 }
	/*
	* 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/smp_lock.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 <asm/atomic.h>
	#include <asm/vgtod.h>
	#include <asm/sys_ia32.h>

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


	asmlinkage long sys32_truncate64(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, stat->uid);
	SET_GID(gid, 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(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(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, 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_mprotect(unsigned long start, size_t len,
	unsigned long prot)
	{
	return sys_mprotect(start, len, prot);
	}

	asmlinkage long sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
	struct sigaction32 __user *oact,
	unsigned int sigsetsize)
	{
	struct k_sigaction new_ka, old_ka;
	int ret;
	compat_sigset_t set32;

	/* XXX: Don't preclude handling different sized sigset_t's. */
	if (sigsetsize != sizeof(compat_sigset_t))
	return -EINVAL;

	if (act) {
	compat_uptr_t handler, restorer;

	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	__get_user(handler, &act->sa_handler) \|\|
	__get_user(new_ka.sa.sa_flags, &act->sa_flags) \|\|
	__get_user(restorer, &act->sa_restorer) \|\|
	__copy_from_user(&set32, &act->sa_mask,
	sizeof(compat_sigset_t)))
	return -EFAULT;
	new_ka.sa.sa_handler = compat_ptr(handler);
	new_ka.sa.sa_restorer = compat_ptr(restorer);

	/*
	* FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
	* than _NSIG_WORDS << 1
	*/
	switch (_NSIG_WORDS) {
	case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
	\| (((long)set32.sig[7]) << 32);
	case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
	\| (((long)set32.sig[5]) << 32);
	case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
	\| (((long)set32.sig[3]) << 32);
	case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
	\| (((long)set32.sig[1]) << 32);
	}
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
	/*
	* FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
	* than _NSIG_WORDS << 1
	*/
	switch (_NSIG_WORDS) {
	case 4:
	set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
	set32.sig[6] = old_ka.sa.sa_mask.sig[3];
	case 3:
	set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
	set32.sig[4] = old_ka.sa.sa_mask.sig[2];
	case 2:
	set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
	set32.sig[2] = old_ka.sa.sa_mask.sig[1];
	case 1:
	set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
	set32.sig[0] = old_ka.sa.sa_mask.sig[0];
	}
	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	__put_user(ptr_to_compat(old_ka.sa.sa_handler),
	&oact->sa_handler) \|\|
	__put_user(ptr_to_compat(old_ka.sa.sa_restorer),
	&oact->sa_restorer) \|\|
	__put_user(old_ka.sa.sa_flags, &oact->sa_flags) \|\|
	__copy_to_user(&oact->sa_mask, &set32,
	sizeof(compat_sigset_t)))
	return -EFAULT;
	}

	return ret;
	}

	asmlinkage long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
	struct old_sigaction32 __user *oact)
	{
	struct k_sigaction new_ka, old_ka;
	int ret;

	if (act) {
	compat_old_sigset_t mask;
	compat_uptr_t handler, restorer;

	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	__get_user(handler, &act->sa_handler) \|\|
	__get_user(new_ka.sa.sa_flags, &act->sa_flags) \|\|
	__get_user(restorer, &act->sa_restorer) \|\|
	__get_user(mask, &act->sa_mask))
	return -EFAULT;

	new_ka.sa.sa_handler = compat_ptr(handler);
	new_ka.sa.sa_restorer = compat_ptr(restorer);

	siginitset(&new_ka.sa.sa_mask, mask);
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	__put_user(ptr_to_compat(old_ka.sa.sa_handler),
	&oact->sa_handler) \|\|
	__put_user(ptr_to_compat(old_ka.sa.sa_restorer),
	&oact->sa_restorer) \|\|
	__put_user(old_ka.sa.sa_flags, &oact->sa_flags) \|\|
	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
	return -EFAULT;
	}

	return ret;
	}

	asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
	compat_sigset_t __user *oset,
	unsigned int sigsetsize)
	{
	sigset_t s;
	compat_sigset_t s32;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (set) {
	if (copy_from_user(&s32, set, sizeof(compat_sigset_t)))
	return -EFAULT;
	switch (_NSIG_WORDS) {
	case 4: s.sig[3] = s32.sig[6] \| (((long)s32.sig[7]) << 32);
	case 3: s.sig[2] = s32.sig[4] \| (((long)s32.sig[5]) << 32);
	case 2: s.sig[1] = s32.sig[2] \| (((long)s32.sig[3]) << 32);
	case 1: s.sig[0] = s32.sig[0] \| (((long)s32.sig[1]) << 32);
	}
	}
	set_fs(KERNEL_DS);
	ret = sys_rt_sigprocmask(how,
	set ? (sigset_t __user *)&s : NULL,
	oset ? (sigset_t __user *)&s : NULL,
	sigsetsize);
	set_fs(old_fs);
	if (ret)
	return ret;
	if (oset) {
	switch (_NSIG_WORDS) {
	case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
	case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
	case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
	case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
	}
	if (copy_to_user(oset, &s32, sizeof(compat_sigset_t)))
	return -EFAULT;
	}
	return 0;
	}

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

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

	/* 32-bit timeval and related flotsam. */

	asmlinkage long sys32_sysfs(int option, u32 arg1, u32 arg2)
	{
	return sys_sysfs(option, arg1, arg2);
	}

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

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

	asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
	compat_size_t sigsetsize)
	{
	sigset_t s;
	compat_sigset_t s32;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
	set_fs(old_fs);
	if (!ret) {
	switch (_NSIG_WORDS) {
	case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
	case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
	case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
	case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
	}
	if (copy_to_user(set, &s32, sizeof(compat_sigset_t)))
	return -EFAULT;
	}
	return ret;
	}

	asmlinkage long sys32_rt_sigqueueinfo(int pid, int sig,
	compat_siginfo_t __user *uinfo)
	{
	siginfo_t info;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (copy_siginfo_from_user32(&info, uinfo))
	return -EFAULT;
	set_fs(KERNEL_DS);
	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
	set_fs(old_fs);
	return ret;
	}

	/* 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, char __user *ubuf, u32 count,
	u32 poslo, u32 poshi)
	{
	return sys_pwrite64(fd, ubuf, count,
	((loff_t)AA(poshi) << 32) \| AA(poslo));
	}


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

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

	asmlinkage long sys32_sendfile(int out_fd, int in_fd,
	compat_off_t __user *offset, s32 count)
	{
	mm_segment_t old_fs = get_fs();
	int ret;
	off_t of;

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

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

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

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

	filename = getname(name);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
	return error;
	error = compat_do_execve(filename, argv, envp, regs);
	putname(filename);
	return error;
	}

	asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
	struct pt_regs *regs)
	{
	void __user parent_tid = (void __user )regs->dx;
	void __user child_tid = (void __user )regs->di;

	if (!newsp)
	newsp = regs->sp;
	return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
	}

	/*
	* Some system calls that need sign extended arguments. This could be
	* done by a generic wrapper.
	*/
	long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
	{
	return sys_lseek(fd, offset, whence);
	}

	long sys32_kill(int pid, int sig)
	{
	return sys_kill(pid, sig);
	}

	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);
	}

	long sys32_vm86_warning(void)
	{
	struct task_struct *me = current;
	static char lastcomm[sizeof(me->comm)];

	if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
	compat_printk(KERN_INFO
	"%s: vm86 mode not supported on 64 bit kernel\n",
	me->comm);
	strncpy(lastcomm, me->comm, sizeof(lastcomm));
	}
	return -ENOSYS;
	}

	long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
	char __user *buf, size_t len)
	{
	return sys_lookup_dcookie(((u64)addr_high << 32) \| addr_low, buf, len);
	}

	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);
	}