[linux-block.git] / arch / s390 / kernel / compat_linux.c

/*
 *  S390 version
 *    Copyright IBM Corp. 2000
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *               Gerhard Tonn (ton@de.ibm.com)   
 *               Thomas Spatzier (tspat@de.ibm.com)
 *
 *  Conversion between 31bit and 64bit native syscalls.
 *
 * Heavily inspired by the 32-bit Sparc compat code which is 
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
 *
 */


#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h> 
#include <linux/mm.h> 
#include <linux/file.h> 
#include <linux/signal.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/uio.h>
#include <linux/quota.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/filter.h>
#include <linux/highmem.h>
#include <linux/highuid.h>
#include <linux/mman.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/binfmts.h>
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/fadvise.h>
#include <linux/ipc.h>
#include <linux/slab.h>

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

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

#include "compat_linux.h"

u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT |
		      PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK |
		      PSW32_MASK_PSTATE | PSW32_ASC_HOME;
 
/* For this source file, we want overflow handling. */

#undef high2lowuid
#undef high2lowgid
#undef low2highuid
#undef low2highgid
#undef SET_UID16
#undef SET_GID16
#undef NEW_TO_OLD_UID
#undef NEW_TO_OLD_GID
#undef SET_OLDSTAT_UID
#undef SET_OLDSTAT_GID
#undef SET_STAT_UID
#undef SET_STAT_GID

#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
#define SET_UID16(var, uid)	var = high2lowuid(uid)
#define SET_GID16(var, gid)	var = high2lowgid(gid)
#define NEW_TO_OLD_UID(uid)	high2lowuid(uid)
#define NEW_TO_OLD_GID(gid)	high2lowgid(gid)
#define SET_OLDSTAT_UID(stat, uid)	(stat).st_uid = high2lowuid(uid)
#define SET_OLDSTAT_GID(stat, gid)	(stat).st_gid = high2lowgid(gid)
#define SET_STAT_UID(stat, uid)		(stat).st_uid = high2lowuid(uid)
#define SET_STAT_GID(stat, gid)		(stat).st_gid = high2lowgid(gid)

asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
{
	return sys_chown(filename, low2highuid(user), low2highgid(group));
}

asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
{
	return sys_lchown(filename, low2highuid(user), low2highgid(group));
}

asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
{
	return sys_fchown(fd, low2highuid(user), low2highgid(group));
}

asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
{
	return sys_setregid(low2highgid(rgid), low2highgid(egid));
}

asmlinkage long sys32_setgid16(u16 gid)
{
	return sys_setgid((gid_t)gid);
}

asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
{
	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
}

asmlinkage long sys32_setuid16(u16 uid)
{
	return sys_setuid((uid_t)uid);
}

asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
{
	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
		low2highuid(suid));
}

asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
{
	int retval;

	if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
	    !(retval = put_user(high2lowuid(current->cred->euid), euid)))
		retval = put_user(high2lowuid(current->cred->suid), suid);

	return retval;
}

asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
{
	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
		low2highgid(sgid));
}

asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
{
	int retval;

	if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
	    !(retval = put_user(high2lowgid(current->cred->egid), egid)))
		retval = put_user(high2lowgid(current->cred->sgid), sgid);

	return retval;
}

asmlinkage long sys32_setfsuid16(u16 uid)
{
	return sys_setfsuid((uid_t)uid);
}

asmlinkage long sys32_setfsgid16(u16 gid)
{
	return sys_setfsgid((gid_t)gid);
}

static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
{
	struct user_namespace *user_ns = current_user_ns();
	int i;
	u16 group;
	kgid_t kgid;

	for (i = 0; i < group_info->ngroups; i++) {
		kgid = GROUP_AT(group_info, i);
		group = (u16)from_kgid_munged(user_ns, kgid);
		if (put_user(group, grouplist+i))
			return -EFAULT;
	}

	return 0;
}

static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
{
	struct user_namespace *user_ns = current_user_ns();
	int i;
	u16 group;
	kgid_t kgid;

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

		kgid = make_kgid(user_ns, (gid_t)group);
		if (!gid_valid(kgid))
			return -EINVAL;

		GROUP_AT(group_info, i) = kgid;
	}

	return 0;
}

asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
{
	int i;

	if (gidsetsize < 0)
		return -EINVAL;

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

asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
{
	struct group_info *group_info;
	int retval;

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

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

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

	return retval;
}

asmlinkage long sys32_getuid16(void)
{
	return high2lowuid(current->cred->uid);
}

asmlinkage long sys32_geteuid16(void)
{
	return high2lowuid(current->cred->euid);
}

asmlinkage long sys32_getgid16(void)
{
	return high2lowgid(current->cred->gid);
}

asmlinkage long sys32_getegid16(void)
{
	return high2lowgid(current->cred->egid);
}

/*
 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
 *
 * This is really horribly ugly.
 */
#ifdef CONFIG_SYSVIPC
asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
{
	if (call >> 16)		/* hack for backward compatibility */
		return -EINVAL;
	switch (call) {
	case SEMTIMEDOP:
		return compat_sys_semtimedop(first, compat_ptr(ptr),
					     second, compat_ptr(third));
	case SEMOP:
		/* struct sembuf is the same on 32 and 64bit :)) */
		return sys_semtimedop(first, compat_ptr(ptr),
				      second, NULL);
	case SEMGET:
		return sys_semget(first, second, third);
	case SEMCTL:
		return compat_sys_semctl(first, second, third,
					 compat_ptr(ptr));
	case MSGSND:
		return compat_sys_msgsnd(first, second, third,
					 compat_ptr(ptr));
	case MSGRCV:
		return compat_sys_msgrcv(first, second, 0, third,
					 0, compat_ptr(ptr));
	case MSGGET:
		return sys_msgget((key_t) first, second);
	case MSGCTL:
		return compat_sys_msgctl(first, second, compat_ptr(ptr));
	case SHMAT:
		return compat_sys_shmat(first, second, third,
					0, compat_ptr(ptr));
	case SHMDT:
		return sys_shmdt(compat_ptr(ptr));
	case SHMGET:
		return sys_shmget(first, (unsigned)second, third);
	case SHMCTL:
		return compat_sys_shmctl(first, second, compat_ptr(ptr));
	}

	return -ENOSYS;
}
#endif

asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
{
	if ((int)high < 0)
		return -EINVAL;
	else
		return sys_truncate(path, (high << 32) | low);
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
{
	if ((int)high < 0)
		return -EINVAL;
	else
		return sys_ftruncate(fd, (high << 32) | low);
}

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 __force __user *) &t);
	set_fs (old_fs);
	if (put_compat_timespec(&t, interval))
		return -EFAULT;
	return ret;
}

asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
			compat_sigset_t __user *oset, size_t 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;
		s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
	}
	set_fs (KERNEL_DS);
	ret = sys_rt_sigprocmask(how,
				 set ? (sigset_t __force __user *) &s : NULL,
				 oset ? (sigset_t __force __user *) &s : NULL,
				 sigsetsize);
	set_fs (old_fs);
	if (ret) return ret;
	if (oset) {
		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_rt_sigpending(compat_sigset_t __user *set,
				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 __force __user *) &s, sigsetsize);
	set_fs (old_fs);
	if (!ret) {
		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 __force __user *) &info);
	set_fs (old_fs);
	return ret;
}

/*
 * sys32_execve() executes a new program after the asm stub has set
 * things up for us.  This should basically do what I want it to.
 */
asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
			     compat_uptr_t __user *envp)
{
	struct pt_regs *regs = task_pt_regs(current);
	char *filename;
	long rc;

	filename = getname(name);
	rc = PTR_ERR(filename);
	if (IS_ERR(filename))
		return rc;
	rc = compat_do_execve(filename, argv, envp, regs);
	if (rc)
		goto out;
	current->thread.fp_regs.fpc=0;
	asm volatile("sfpc %0,0" : : "d" (0));
	rc = regs->gprs[2];
out:
	putname(filename);
	return rc;
}

asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
				size_t count, u32 poshi, u32 poslo)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL;
	return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
				size_t count, u32 poshi, u32 poslo)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL;
	return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
{
	return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
}

asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t 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 __force __user *) &of : NULL, count);
	set_fs(old_fs);
	
	if (offset && put_user(of, offset))
		return -EFAULT;
		
	return ret;
}

asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
				compat_loff_t __user *offset, s32 count)
{
	mm_segment_t old_fs = get_fs();
	int ret;
	loff_t lof;
	
	if (offset && get_user(lof, offset))
		return -EFAULT;
		
	set_fs(KERNEL_DS);
	ret = sys_sendfile64(out_fd, in_fd,
			     offset ? (loff_t __force __user *) &lof : NULL,
			     count);
	set_fs(old_fs);
	
	if (offset && put_user(lof, offset))
		return -EFAULT;
		
	return ret;
}

struct stat64_emu31 {
	unsigned long long  st_dev;
	unsigned int    __pad1;
#define STAT64_HAS_BROKEN_ST_INO        1
	u32             __st_ino;
	unsigned int    st_mode;
	unsigned int    st_nlink;
	u32             st_uid;
	u32             st_gid;
	unsigned long long  st_rdev;
	unsigned int    __pad3;
	long            st_size;
	u32             st_blksize;
	unsigned char   __pad4[4];
	u32             __pad5;     /* future possible st_blocks high bits */
	u32             st_blocks;  /* Number 512-byte blocks allocated. */
	u32             st_atime;
	u32             __pad6;
	u32             st_mtime;
	u32             __pad7;
	u32             st_ctime;
	u32             __pad8;     /* will be high 32 bits of ctime someday */
	unsigned long   st_ino;
};	

static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
{
	struct stat64_emu31 tmp;

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

	tmp.st_dev = huge_encode_dev(stat->dev);
	tmp.st_ino = stat->ino;
	tmp.__st_ino = (u32)stat->ino;
	tmp.st_mode = stat->mode;
	tmp.st_nlink = (unsigned int)stat->nlink;
	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
	tmp.st_rdev = huge_encode_dev(stat->rdev);
	tmp.st_size = stat->size;
	tmp.st_blksize = (u32)stat->blksize;
	tmp.st_blocks = (u32)stat->blocks;
	tmp.st_atime = (u32)stat->atime.tv_sec;
	tmp.st_mtime = (u32)stat->mtime.tv_sec;
	tmp.st_ctime = (u32)stat->ctime.tv_sec;

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

asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __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_emu31 __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 long fd, struct stat64_emu31 __user * statbuf)
{
	struct kstat stat;
	int ret = vfs_fstat(fd, &stat);
	if (!ret)
		ret = cp_stat64(statbuf, &stat);
	return ret;
}

asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
				struct stat64_emu31 __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_struct_emu31 {
	compat_ulong_t addr;
	compat_ulong_t len;
	compat_ulong_t prot;
	compat_ulong_t flags;
	compat_ulong_t fd;
	compat_ulong_t offset;
};

asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
{
	struct mmap_arg_struct_emu31 a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	if (a.offset & ~PAGE_MASK)
		return -EINVAL;
	a.addr = (unsigned long) compat_ptr(a.addr);
	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
			      a.offset >> PAGE_SHIFT);
}

asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
{
	struct mmap_arg_struct_emu31 a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	a.addr = (unsigned long) compat_ptr(a.addr);
	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
}

asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL; 

	return sys_read(fd, buf, count);
}

asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL; 

	return sys_write(fd, buf, count);
}

/*
 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 * because the 31 bit values differ from the 64 bit values.
 */

asmlinkage long
sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
{
	if (advise == 4)
		advise = POSIX_FADV_DONTNEED;
	else if (advise == 5)
		advise = POSIX_FADV_NOREUSE;
	return sys_fadvise64(fd, offset, len, advise);
}

struct fadvise64_64_args {
	int fd;
	long long offset;
	long long len;
	int advice;
};

asmlinkage long
sys32_fadvise64_64(struct fadvise64_64_args __user *args)
{
	struct fadvise64_64_args a;

	if ( copy_from_user(&a, args, sizeof(a)) )
		return -EFAULT;
	if (a.advice == 4)
		a.advice = POSIX_FADV_DONTNEED;
	else if (a.advice == 5)
		a.advice = POSIX_FADV_NOREUSE;
	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	* S390 version
a53c8fab	3	* Copyright IBM Corp. 2000
1da177e4 LT	4	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
	5	* Gerhard Tonn (ton@de.ibm.com)
	6	* Thomas Spatzier (tspat@de.ibm.com)
	7	*
	8	* Conversion between 31bit and 64bit native syscalls.
	9	*
	10	* Heavily inspired by the 32-bit Sparc compat code which is
	11	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	12	* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
	13	*
	14	*/
	15
	16
1da177e4 LT	17	#include <linux/kernel.h>
	18	#include <linux/sched.h>
	19	#include <linux/fs.h>
	20	#include <linux/mm.h>
	21	#include <linux/file.h>
	22	#include <linux/signal.h>
	23	#include <linux/resource.h>
	24	#include <linux/times.h>
1da177e4	25	#include <linux/smp.h>
1da177e4 LT	26	#include <linux/sem.h>
	27	#include <linux/msg.h>
	28	#include <linux/shm.h>
1da177e4	29	#include <linux/uio.h>
1da177e4 LT	30	#include <linux/quota.h>
1da177e4 LT	31	#include <linux/module.h>
1da177e4 LT	32	#include <linux/poll.h>
	33	#include <linux/personality.h>
	34	#include <linux/stat.h>
	35	#include <linux/filter.h>
	36	#include <linux/highmem.h>
	37	#include <linux/highuid.h>
	38	#include <linux/mman.h>
	39	#include <linux/ipv6.h>
	40	#include <linux/in.h>
	41	#include <linux/icmpv6.h>
	42	#include <linux/syscalls.h>
	43	#include <linux/sysctl.h>
	44	#include <linux/binfmts.h>
a9415644	45	#include <linux/capability.h>
1da177e4 LT	46	#include <linux/compat.h>
	47	#include <linux/vfs.h>
	48	#include <linux/ptrace.h>
068e1b94	49	#include <linux/fadvise.h>
cba4fbbf	50	#include <linux/ipc.h>
5a0e3ad6	51	#include <linux/slab.h>
1da177e4 LT	52
1da177e4 LT	53	#include <asm/types.h>
1da177e4	54	#include <asm/uaccess.h>
1da177e4 LT	55
	56	#include <net/scm.h>
	57	#include <net/sock.h>
	58
	59	#include "compat_linux.h"
	60
b50511e4 MS	61	u32 psw32_user_bits = PSW32_MASK_DAT \| PSW32_MASK_IO \| PSW32_MASK_EXT \|
	62	PSW32_DEFAULT_KEY \| PSW32_MASK_BASE \| PSW32_MASK_MCHECK \|
	63	PSW32_MASK_PSTATE \| PSW32_ASC_HOME;
1da177e4 LT	64
	65	/* For this source file, we want overflow handling. */
	66
	67	#undef high2lowuid
	68	#undef high2lowgid
	69	#undef low2highuid
	70	#undef low2highgid
	71	#undef SET_UID16
	72	#undef SET_GID16
	73	#undef NEW_TO_OLD_UID
	74	#undef NEW_TO_OLD_GID
	75	#undef SET_OLDSTAT_UID
	76	#undef SET_OLDSTAT_GID
	77	#undef SET_STAT_UID
	78	#undef SET_STAT_GID
	79
	80	#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
	81	#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
	82	#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
	83	#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
	84	#define SET_UID16(var, uid) var = high2lowuid(uid)
	85	#define SET_GID16(var, gid) var = high2lowgid(gid)
	86	#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
	87	#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
	88	#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	89	#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	90	#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	91	#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	92
24954a14	93	asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
1da177e4 LT	94	{
	95	return sys_chown(filename, low2highuid(user), low2highgid(group));
	96	}
	97
24954a14	98	asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
1da177e4 LT	99	{
	100	return sys_lchown(filename, low2highuid(user), low2highgid(group));
	101	}
	102
	103	asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
	104	{
	105	return sys_fchown(fd, low2highuid(user), low2highgid(group));
	106	}
	107
	108	asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
	109	{
	110	return sys_setregid(low2highgid(rgid), low2highgid(egid));
	111	}
	112
	113	asmlinkage long sys32_setgid16(u16 gid)
	114	{
	115	return sys_setgid((gid_t)gid);
	116	}
	117
	118	asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
	119	{
	120	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
	121	}
	122
	123	asmlinkage long sys32_setuid16(u16 uid)
	124	{
	125	return sys_setuid((uid_t)uid);
	126	}
	127
	128	asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
	129	{
	130	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
	131	low2highuid(suid));
	132	}
	133
24954a14	134	asmlinkage long sys32_getresuid16(u16 __user ruid, u16 __user euid, u16 __user *suid)
1da177e4 LT	135	{
	136	int retval;
	137
b6dff3ec DH	138	if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
	139	!(retval = put_user(high2lowuid(current->cred->euid), euid)))
	140	retval = put_user(high2lowuid(current->cred->suid), suid);
1da177e4 LT	141
	142	return retval;
	143	}
	144
	145	asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
	146	{
	147	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
	148	low2highgid(sgid));
	149	}
	150
24954a14	151	asmlinkage long sys32_getresgid16(u16 __user rgid, u16 __user egid, u16 __user *sgid)
1da177e4 LT	152	{
	153	int retval;
	154
b6dff3ec DH	155	if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
	156	!(retval = put_user(high2lowgid(current->cred->egid), egid)))
	157	retval = put_user(high2lowgid(current->cred->sgid), sgid);
1da177e4 LT	158
	159	return retval;
	160	}
	161
	162	asmlinkage long sys32_setfsuid16(u16 uid)
	163	{
	164	return sys_setfsuid((uid_t)uid);
	165	}
	166
	167	asmlinkage long sys32_setfsgid16(u16 gid)
	168	{
	169	return sys_setfsgid((gid_t)gid);
	170	}
	171
24954a14	172	static int groups16_to_user(u16 __user grouplist, struct group_info group_info)
1da177e4	173	{
ae2975bc	174	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	175	int i;
1da177e4 LT	176	u16 group;
ae2975bc	177	kgid_t kgid;
1da177e4 LT	178
1da177e4 LT	179	for (i = 0; i < group_info->ngroups; i++) {
ae2975bc EB	180	kgid = GROUP_AT(group_info, i);
ae2975bc EB	181	group = (u16)from_kgid_munged(user_ns, kgid);
1da177e4 LT	182	if (put_user(group, grouplist+i))
	183	return -EFAULT;
	184	}
	185
	186	return 0;
	187	}
	188
24954a14	189	static int groups16_from_user(struct group_info group_info, u16 __user grouplist)
1da177e4	190	{
ae2975bc	191	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	192	int i;
1da177e4 LT	193	u16 group;
ae2975bc	194	kgid_t kgid;
1da177e4 LT	195
	196	for (i = 0; i < group_info->ngroups; i++) {
	197	if (get_user(group, grouplist+i))
	198	return -EFAULT;
ae2975bc EB	199
	200	kgid = make_kgid(user_ns, (gid_t)group);
	201	if (!gid_valid(kgid))
	202	return -EINVAL;
	203
	204	GROUP_AT(group_info, i) = kgid;
1da177e4 LT	205	}
	206
	207	return 0;
	208	}
	209
24954a14	210	asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4 LT	211	{
	212	int i;
	213
	214	if (gidsetsize < 0)
	215	return -EINVAL;
	216
b6dff3ec DH	217	get_group_info(current->cred->group_info);
b6dff3ec DH	218	i = current->cred->group_info->ngroups;
1da177e4 LT	219	if (gidsetsize) {
	220	if (i > gidsetsize) {
	221	i = -EINVAL;
	222	goto out;
	223	}
b6dff3ec	224	if (groups16_to_user(grouplist, current->cred->group_info)) {
1da177e4 LT	225	i = -EFAULT;
	226	goto out;
	227	}
	228	}
	229	out:
b6dff3ec	230	put_group_info(current->cred->group_info);
1da177e4 LT	231	return i;
	232	}
	233
24954a14	234	asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4 LT	235	{
	236	struct group_info *group_info;
	237	int retval;
	238
	239	if (!capable(CAP_SETGID))
	240	return -EPERM;
	241	if ((unsigned)gidsetsize > NGROUPS_MAX)
	242	return -EINVAL;
	243
	244	group_info = groups_alloc(gidsetsize);
	245	if (!group_info)
	246	return -ENOMEM;
	247	retval = groups16_from_user(group_info, grouplist);
	248	if (retval) {
	249	put_group_info(group_info);
	250	return retval;
	251	}
	252
	253	retval = set_current_groups(group_info);
	254	put_group_info(group_info);
	255
	256	return retval;
	257	}
	258
	259	asmlinkage long sys32_getuid16(void)
	260	{
b6dff3ec	261	return high2lowuid(current->cred->uid);
1da177e4 LT	262	}
	263
	264	asmlinkage long sys32_geteuid16(void)
	265	{
b6dff3ec	266	return high2lowuid(current->cred->euid);
1da177e4 LT	267	}
	268
	269	asmlinkage long sys32_getgid16(void)
	270	{
b6dff3ec	271	return high2lowgid(current->cred->gid);
1da177e4 LT	272	}
	273
	274	asmlinkage long sys32_getegid16(void)
	275	{
b6dff3ec	276	return high2lowgid(current->cred->egid);
1da177e4 LT	277	}
1da177e4 LT	278
1da177e4 LT	279	/*
	280	* sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
	281	*
	282	* This is really horribly ugly.
	283	*/
1df23957	284	#ifdef CONFIG_SYSVIPC
1da177e4 LT	285	asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
	286	{
	287	if (call >> 16) /* hack for backward compatibility */
	288	return -EINVAL;
1da177e4 LT	289	switch (call) {
	290	case SEMTIMEDOP:
	291	return compat_sys_semtimedop(first, compat_ptr(ptr),
	292	second, compat_ptr(third));
	293	case SEMOP:
	294	/* struct sembuf is the same on 32 and 64bit :)) */
	295	return sys_semtimedop(first, compat_ptr(ptr),
	296	second, NULL);
	297	case SEMGET:
	298	return sys_semget(first, second, third);
	299	case SEMCTL:
	300	return compat_sys_semctl(first, second, third,
	301	compat_ptr(ptr));
	302	case MSGSND:
	303	return compat_sys_msgsnd(first, second, third,
	304	compat_ptr(ptr));
	305	case MSGRCV:
	306	return compat_sys_msgrcv(first, second, 0, third,
	307	0, compat_ptr(ptr));
	308	case MSGGET:
	309	return sys_msgget((key_t) first, second);
	310	case MSGCTL:
	311	return compat_sys_msgctl(first, second, compat_ptr(ptr));
	312	case SHMAT:
	313	return compat_sys_shmat(first, second, third,
	314	0, compat_ptr(ptr));
	315	case SHMDT:
	316	return sys_shmdt(compat_ptr(ptr));
	317	case SHMGET:
	318	return sys_shmget(first, (unsigned)second, third);
	319	case SHMCTL:
	320	return compat_sys_shmctl(first, second, compat_ptr(ptr));
	321	}
	322
	323	return -ENOSYS;
	324	}
1df23957	325	#endif
1da177e4	326
24954a14	327	asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
1da177e4 LT	328	{
	329	if ((int)high < 0)
	330	return -EINVAL;
	331	else
	332	return sys_truncate(path, (high << 32) \| low);
	333	}
	334
	335	asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
	336	{
	337	if ((int)high < 0)
	338	return -EINVAL;
	339	else
	340	return sys_ftruncate(fd, (high << 32) \| low);
	341	}
	342
1da177e4 LT	343	asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
	344	struct compat_timespec __user *interval)
	345	{
	346	struct timespec t;
	347	int ret;
	348	mm_segment_t old_fs = get_fs ();
	349
	350	set_fs (KERNEL_DS);
2b67fc46 HC	351	ret = sys_sched_rr_get_interval(pid,
2b67fc46 HC	352	(struct timespec __force __user *) &t);
1da177e4 LT	353	set_fs (old_fs);
	354	if (put_compat_timespec(&t, interval))
	355	return -EFAULT;
	356	return ret;
	357	}
	358
	359	asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
	360	compat_sigset_t __user *oset, size_t sigsetsize)
	361	{
	362	sigset_t s;
	363	compat_sigset_t s32;
	364	int ret;
	365	mm_segment_t old_fs = get_fs();
	366
	367	if (set) {
	368	if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
	369	return -EFAULT;
399c1d8d	370	s.sig[0] = s32.sig[0] \| (((long)s32.sig[1]) << 32);
1da177e4 LT	371	}
1da177e4 LT	372	set_fs (KERNEL_DS);
d2c993d8	373	ret = sys_rt_sigprocmask(how,
2b67fc46 HC	374	set ? (sigset_t __force __user *) &s : NULL,
2b67fc46 HC	375	oset ? (sigset_t __force __user *) &s : NULL,
d2c993d8	376	sigsetsize);
1da177e4 LT	377	set_fs (old_fs);
	378	if (ret) return ret;
	379	if (oset) {
399c1d8d MS	380	s32.sig[1] = (s.sig[0] >> 32);
399c1d8d MS	381	s32.sig[0] = s.sig[0];
1da177e4 LT	382	if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
	383	return -EFAULT;
	384	}
	385	return 0;
	386	}
	387
	388	asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
	389	size_t sigsetsize)
	390	{
	391	sigset_t s;
	392	compat_sigset_t s32;
	393	int ret;
	394	mm_segment_t old_fs = get_fs();
	395
	396	set_fs (KERNEL_DS);
2b67fc46	397	ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
1da177e4 LT	398	set_fs (old_fs);
1da177e4 LT	399	if (!ret) {
399c1d8d MS	400	s32.sig[1] = (s.sig[0] >> 32);
399c1d8d MS	401	s32.sig[0] = s.sig[0];
1da177e4 LT	402	if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
	403	return -EFAULT;
	404	}
	405	return ret;
	406	}
	407
	408	asmlinkage long
	409	sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
	410	{
	411	siginfo_t info;
	412	int ret;
	413	mm_segment_t old_fs = get_fs();
	414
	415	if (copy_siginfo_from_user32(&info, uinfo))
	416	return -EFAULT;
	417	set_fs (KERNEL_DS);
2b67fc46	418	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
1da177e4 LT	419	set_fs (old_fs);
	420	return ret;
	421	}
	422
	423	/*
	424	* sys32_execve() executes a new program after the asm stub has set
	425	* things up for us. This should basically do what I want it to.
	426	*/
c7887325	427	asmlinkage long sys32_execve(const char __user name, compat_uptr_t __user argv,
3e86a8c6	428	compat_uptr_t __user *envp)
1da177e4	429	{
03ff9a23 MS	430	struct pt_regs *regs = task_pt_regs(current);
03ff9a23 MS	431	char *filename;
3e86a8c6 HC	432	long rc;
	433
	434	filename = getname(name);
	435	rc = PTR_ERR(filename);
	436	if (IS_ERR(filename))
	437	return rc;
	438	rc = compat_do_execve(filename, argv, envp, regs);
	439	if (rc)
	440	goto out;
03ff9a23 MS	441	current->thread.fp_regs.fpc=0;
03ff9a23 MS	442	asm volatile("sfpc %0,0" : : "d" (0));
3e86a8c6	443	rc = regs->gprs[2];
1da177e4	444	out:
3e86a8c6 HC	445	putname(filename);
3e86a8c6 HC	446	return rc;
1da177e4 LT	447	}
1da177e4 LT	448
24954a14	449	asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
1da177e4 LT	450	size_t count, u32 poshi, u32 poslo)
	451	{
	452	if ((compat_ssize_t) count < 0)
	453	return -EINVAL;
	454	return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) \| AA(poslo));
	455	}
	456
24954a14	457	asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
1da177e4 LT	458	size_t count, u32 poshi, u32 poslo)
	459	{
	460	if ((compat_ssize_t) count < 0)
	461	return -EINVAL;
	462	return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) \| AA(poslo));
	463	}
	464
	465	asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
	466	{
	467	return sys_readahead(fd, ((loff_t)AA(offhi) << 32) \| AA(offlo), count);
	468	}
	469
24954a14	470	asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
1da177e4 LT	471	{
	472	mm_segment_t old_fs = get_fs();
	473	int ret;
	474	off_t of;
	475
	476	if (offset && get_user(of, offset))
	477	return -EFAULT;
	478
	479	set_fs(KERNEL_DS);
d2c993d8	480	ret = sys_sendfile(out_fd, in_fd,
2b67fc46	481	offset ? (off_t __force __user *) &of : NULL, count);
1da177e4 LT	482	set_fs(old_fs);
1da177e4 LT	483
83b942bd	484	if (offset && put_user(of, offset))
1da177e4 LT	485	return -EFAULT;
	486
	487	return ret;
	488	}
	489
	490	asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
24954a14	491	compat_loff_t __user *offset, s32 count)
1da177e4 LT	492	{
	493	mm_segment_t old_fs = get_fs();
	494	int ret;
	495	loff_t lof;
	496
	497	if (offset && get_user(lof, offset))
	498	return -EFAULT;
	499
	500	set_fs(KERNEL_DS);
d2c993d8	501	ret = sys_sendfile64(out_fd, in_fd,
2b67fc46 HC	502	offset ? (loff_t __force __user *) &lof : NULL,
2b67fc46 HC	503	count);
1da177e4 LT	504	set_fs(old_fs);
	505
	506	if (offset && put_user(lof, offset))
	507	return -EFAULT;
	508
	509	return ret;
	510	}
	511
1da177e4 LT	512	struct stat64_emu31 {
	513	unsigned long long st_dev;
	514	unsigned int __pad1;
	515	#define STAT64_HAS_BROKEN_ST_INO 1
	516	u32 __st_ino;
	517	unsigned int st_mode;
	518	unsigned int st_nlink;
	519	u32 st_uid;
	520	u32 st_gid;
	521	unsigned long long st_rdev;
	522	unsigned int __pad3;
	523	long st_size;
	524	u32 st_blksize;
	525	unsigned char __pad4[4];
	526	u32 __pad5; /* future possible st_blocks high bits */
	527	u32 st_blocks; /* Number 512-byte blocks allocated. */
	528	u32 st_atime;
	529	u32 __pad6;
	530	u32 st_mtime;
	531	u32 __pad7;
	532	u32 st_ctime;
	533	u32 __pad8; /* will be high 32 bits of ctime someday */
	534	unsigned long st_ino;
	535	};
	536
24954a14	537	static int cp_stat64(struct stat64_emu31 __user ubuf, struct kstat stat)
1da177e4 LT	538	{
	539	struct stat64_emu31 tmp;
	540
	541	memset(&tmp, 0, sizeof(tmp));
	542
	543	tmp.st_dev = huge_encode_dev(stat->dev);
	544	tmp.st_ino = stat->ino;
	545	tmp.__st_ino = (u32)stat->ino;
	546	tmp.st_mode = stat->mode;
	547	tmp.st_nlink = (unsigned int)stat->nlink;
a7c1938e EB	548	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
a7c1938e EB	549	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4 LT	550	tmp.st_rdev = huge_encode_dev(stat->rdev);
	551	tmp.st_size = stat->size;
	552	tmp.st_blksize = (u32)stat->blksize;
	553	tmp.st_blocks = (u32)stat->blocks;
	554	tmp.st_atime = (u32)stat->atime.tv_sec;
	555	tmp.st_mtime = (u32)stat->mtime.tv_sec;
	556	tmp.st_ctime = (u32)stat->ctime.tv_sec;
	557
	558	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	559	}
	560
c7887325	561	asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4 LT	562	{
	563	struct kstat stat;
	564	int ret = vfs_stat(filename, &stat);
	565	if (!ret)
	566	ret = cp_stat64(statbuf, &stat);
	567	return ret;
	568	}
	569
c7887325	570	asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4 LT	571	{
	572	struct kstat stat;
	573	int ret = vfs_lstat(filename, &stat);
	574	if (!ret)
	575	ret = cp_stat64(statbuf, &stat);
	576	return ret;
	577	}
	578
24954a14	579	asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
1da177e4 LT	580	{
	581	struct kstat stat;
	582	int ret = vfs_fstat(fd, &stat);
	583	if (!ret)
	584	ret = cp_stat64(statbuf, &stat);
	585	return ret;
	586	}
	587
c7887325	588	asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
ed3d021b	589	struct stat64_emu31 __user* statbuf, int flag)
19bf9cbf HC	590	{
19bf9cbf HC	591	struct kstat stat;
0112fc22	592	int error;
19bf9cbf	593
0112fc22 OD	594	error = vfs_fstatat(dfd, filename, &stat, flag);
	595	if (error)
	596	return error;
	597	return cp_stat64(statbuf, &stat);
19bf9cbf HC	598	}
19bf9cbf HC	599
1da177e4 LT	600	/*
	601	* Linux/i386 didn't use to be able to handle more than
	602	* 4 system call parameters, so these system calls used a memory
	603	* block for parameter passing..
	604	*/
	605
	606	struct mmap_arg_struct_emu31 {
d3815898 HC	607	compat_ulong_t addr;
	608	compat_ulong_t len;
	609	compat_ulong_t prot;
	610	compat_ulong_t flags;
	611	compat_ulong_t fd;
	612	compat_ulong_t offset;
1da177e4 LT	613	};
1da177e4 LT	614
d3815898	615	asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
1da177e4 LT	616	{
1da177e4 LT	617	struct mmap_arg_struct_emu31 a;
1da177e4 LT	618
1da177e4 LT	619	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	620	return -EFAULT;
1da177e4	621	if (a.offset & ~PAGE_MASK)
d3815898 HC	622	return -EINVAL;
	623	a.addr = (unsigned long) compat_ptr(a.addr);
	624	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
	625	a.offset >> PAGE_SHIFT);
1da177e4 LT	626	}
1da177e4 LT	627
d3815898	628	asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
1da177e4 LT	629	{
1da177e4 LT	630	struct mmap_arg_struct_emu31 a;
1da177e4 LT	631
1da177e4 LT	632	if (copy_from_user(&a, arg, sizeof(a)))
d3815898 HC	633	return -EFAULT;
	634	a.addr = (unsigned long) compat_ptr(a.addr);
	635	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
1da177e4 LT	636	}
1da177e4 LT	637
24954a14	638	asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
1da177e4 LT	639	{
	640	if ((compat_ssize_t) count < 0)
	641	return -EINVAL;
	642
	643	return sys_read(fd, buf, count);
	644	}
	645
c7887325	646	asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
1da177e4 LT	647	{
	648	if ((compat_ssize_t) count < 0)
	649	return -EINVAL;
	650
	651	return sys_write(fd, buf, count);
	652	}
	653
068e1b94 MS	654	/*
	655	* 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
	656	* These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
	657	* because the 31 bit values differ from the 64 bit values.
	658	*/
	659
	660	asmlinkage long
	661	sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
	662	{
	663	if (advise == 4)
	664	advise = POSIX_FADV_DONTNEED;
	665	else if (advise == 5)
	666	advise = POSIX_FADV_NOREUSE;
	667	return sys_fadvise64(fd, offset, len, advise);
	668	}
	669
	670	struct fadvise64_64_args {
	671	int fd;
	672	long long offset;
	673	long long len;
	674	int advice;
	675	};
	676
	677	asmlinkage long
	678	sys32_fadvise64_64(struct fadvise64_64_args __user *args)
	679	{
	680	struct fadvise64_64_args a;
	681
	682	if ( copy_from_user(&a, args, sizeof(a)) )
	683	return -EFAULT;
	684	if (a.advice == 4)
	685	a.advice = POSIX_FADV_DONTNEED;
	686	else if (a.advice == 5)
	687	a.advice = POSIX_FADV_NOREUSE;
	688	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	689	}