[deliverable/linux.git] / arch / s390 / kernel / compat_linux.c

/*
 *  arch/s390x/kernel/linux32.c
 *
 *  S390 version
 *    Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    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 LT	1	/*
	2	* arch/s390x/kernel/linux32.c
	3	*
	4	* S390 version
	5	* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
	7	* Gerhard Tonn (ton@de.ibm.com)
	8	* Thomas Spatzier (tspat@de.ibm.com)
	9	*
	10	* Conversion between 31bit and 64bit native syscalls.
	11	*
	12	* Heavily inspired by the 32-bit Sparc compat code which is
	13	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	14	* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
	15	*
	16	*/
	17
	18
1da177e4 LT	19	#include <linux/kernel.h>
	20	#include <linux/sched.h>
	21	#include <linux/fs.h>
	22	#include <linux/mm.h>
	23	#include <linux/file.h>
	24	#include <linux/signal.h>
	25	#include <linux/resource.h>
	26	#include <linux/times.h>
1da177e4	27	#include <linux/smp.h>
1da177e4 LT	28	#include <linux/sem.h>
	29	#include <linux/msg.h>
	30	#include <linux/shm.h>
1da177e4	31	#include <linux/uio.h>
1da177e4 LT	32	#include <linux/quota.h>
1da177e4 LT	33	#include <linux/module.h>
1da177e4 LT	34	#include <linux/poll.h>
	35	#include <linux/personality.h>
	36	#include <linux/stat.h>
	37	#include <linux/filter.h>
	38	#include <linux/highmem.h>
	39	#include <linux/highuid.h>
	40	#include <linux/mman.h>
	41	#include <linux/ipv6.h>
	42	#include <linux/in.h>
	43	#include <linux/icmpv6.h>
	44	#include <linux/syscalls.h>
	45	#include <linux/sysctl.h>
	46	#include <linux/binfmts.h>
a9415644	47	#include <linux/capability.h>
1da177e4 LT	48	#include <linux/compat.h>
	49	#include <linux/vfs.h>
	50	#include <linux/ptrace.h>
068e1b94	51	#include <linux/fadvise.h>
cba4fbbf	52	#include <linux/ipc.h>
5a0e3ad6	53	#include <linux/slab.h>
1da177e4 LT	54
1da177e4 LT	55	#include <asm/types.h>
1da177e4	56	#include <asm/uaccess.h>
1da177e4 LT	57
	58	#include <net/scm.h>
	59	#include <net/sock.h>
	60
	61	#include "compat_linux.h"
	62
b50511e4 MS	63	u32 psw32_user_bits = PSW32_MASK_DAT \| PSW32_MASK_IO \| PSW32_MASK_EXT \|
	64	PSW32_DEFAULT_KEY \| PSW32_MASK_BASE \| PSW32_MASK_MCHECK \|
	65	PSW32_MASK_PSTATE \| PSW32_ASC_HOME;
1da177e4 LT	66
	67	/* For this source file, we want overflow handling. */
	68
	69	#undef high2lowuid
	70	#undef high2lowgid
	71	#undef low2highuid
	72	#undef low2highgid
	73	#undef SET_UID16
	74	#undef SET_GID16
	75	#undef NEW_TO_OLD_UID
	76	#undef NEW_TO_OLD_GID
	77	#undef SET_OLDSTAT_UID
	78	#undef SET_OLDSTAT_GID
	79	#undef SET_STAT_UID
	80	#undef SET_STAT_GID
	81
	82	#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
	83	#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
	84	#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
	85	#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
	86	#define SET_UID16(var, uid) var = high2lowuid(uid)
	87	#define SET_GID16(var, gid) var = high2lowgid(gid)
	88	#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
	89	#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
	90	#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	91	#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	92	#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	93	#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	94
24954a14	95	asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
1da177e4 LT	96	{
	97	return sys_chown(filename, low2highuid(user), low2highgid(group));
	98	}
	99
24954a14	100	asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
1da177e4 LT	101	{
	102	return sys_lchown(filename, low2highuid(user), low2highgid(group));
	103	}
	104
	105	asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
	106	{
	107	return sys_fchown(fd, low2highuid(user), low2highgid(group));
	108	}
	109
	110	asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
	111	{
	112	return sys_setregid(low2highgid(rgid), low2highgid(egid));
	113	}
	114
	115	asmlinkage long sys32_setgid16(u16 gid)
	116	{
	117	return sys_setgid((gid_t)gid);
	118	}
	119
	120	asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
	121	{
	122	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
	123	}
	124
	125	asmlinkage long sys32_setuid16(u16 uid)
	126	{
	127	return sys_setuid((uid_t)uid);
	128	}
	129
	130	asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
	131	{
	132	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
	133	low2highuid(suid));
	134	}
	135
24954a14	136	asmlinkage long sys32_getresuid16(u16 __user ruid, u16 __user euid, u16 __user *suid)
1da177e4 LT	137	{
	138	int retval;
	139
b6dff3ec DH	140	if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
	141	!(retval = put_user(high2lowuid(current->cred->euid), euid)))
	142	retval = put_user(high2lowuid(current->cred->suid), suid);
1da177e4 LT	143
	144	return retval;
	145	}
	146
	147	asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
	148	{
	149	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
	150	low2highgid(sgid));
	151	}
	152
24954a14	153	asmlinkage long sys32_getresgid16(u16 __user rgid, u16 __user egid, u16 __user *sgid)
1da177e4 LT	154	{
	155	int retval;
	156
b6dff3ec DH	157	if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
	158	!(retval = put_user(high2lowgid(current->cred->egid), egid)))
	159	retval = put_user(high2lowgid(current->cred->sgid), sgid);
1da177e4 LT	160
	161	return retval;
	162	}
	163
	164	asmlinkage long sys32_setfsuid16(u16 uid)
	165	{
	166	return sys_setfsuid((uid_t)uid);
	167	}
	168
	169	asmlinkage long sys32_setfsgid16(u16 gid)
	170	{
	171	return sys_setfsgid((gid_t)gid);
	172	}
	173
24954a14	174	static int groups16_to_user(u16 __user grouplist, struct group_info group_info)
1da177e4	175	{
ae2975bc	176	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	177	int i;
1da177e4 LT	178	u16 group;
ae2975bc	179	kgid_t kgid;
1da177e4 LT	180
1da177e4 LT	181	for (i = 0; i < group_info->ngroups; i++) {
ae2975bc EB	182	kgid = GROUP_AT(group_info, i);
ae2975bc EB	183	group = (u16)from_kgid_munged(user_ns, kgid);
1da177e4 LT	184	if (put_user(group, grouplist+i))
	185	return -EFAULT;
	186	}
	187
	188	return 0;
	189	}
	190
24954a14	191	static int groups16_from_user(struct group_info group_info, u16 __user grouplist)
1da177e4	192	{
ae2975bc	193	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	194	int i;
1da177e4 LT	195	u16 group;
ae2975bc	196	kgid_t kgid;
1da177e4 LT	197
	198	for (i = 0; i < group_info->ngroups; i++) {
	199	if (get_user(group, grouplist+i))
	200	return -EFAULT;
ae2975bc EB	201
	202	kgid = make_kgid(user_ns, (gid_t)group);
	203	if (!gid_valid(kgid))
	204	return -EINVAL;
	205
	206	GROUP_AT(group_info, i) = kgid;
1da177e4 LT	207	}
	208
	209	return 0;
	210	}
	211
24954a14	212	asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4 LT	213	{
	214	int i;
	215
	216	if (gidsetsize < 0)
	217	return -EINVAL;
	218
b6dff3ec DH	219	get_group_info(current->cred->group_info);
b6dff3ec DH	220	i = current->cred->group_info->ngroups;
1da177e4 LT	221	if (gidsetsize) {
	222	if (i > gidsetsize) {
	223	i = -EINVAL;
	224	goto out;
	225	}
b6dff3ec	226	if (groups16_to_user(grouplist, current->cred->group_info)) {
1da177e4 LT	227	i = -EFAULT;
	228	goto out;
	229	}
	230	}
	231	out:
b6dff3ec	232	put_group_info(current->cred->group_info);
1da177e4 LT	233	return i;
	234	}
	235
24954a14	236	asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4 LT	237	{
	238	struct group_info *group_info;
	239	int retval;
	240
	241	if (!capable(CAP_SETGID))
	242	return -EPERM;
	243	if ((unsigned)gidsetsize > NGROUPS_MAX)
	244	return -EINVAL;
	245
	246	group_info = groups_alloc(gidsetsize);
	247	if (!group_info)
	248	return -ENOMEM;
	249	retval = groups16_from_user(group_info, grouplist);
	250	if (retval) {
	251	put_group_info(group_info);
	252	return retval;
	253	}
	254
	255	retval = set_current_groups(group_info);
	256	put_group_info(group_info);
	257
	258	return retval;
	259	}
	260
	261	asmlinkage long sys32_getuid16(void)
	262	{
b6dff3ec	263	return high2lowuid(current->cred->uid);
1da177e4 LT	264	}
	265
	266	asmlinkage long sys32_geteuid16(void)
	267	{
b6dff3ec	268	return high2lowuid(current->cred->euid);
1da177e4 LT	269	}
	270
	271	asmlinkage long sys32_getgid16(void)
	272	{
b6dff3ec	273	return high2lowgid(current->cred->gid);
1da177e4 LT	274	}
	275
	276	asmlinkage long sys32_getegid16(void)
	277	{
b6dff3ec	278	return high2lowgid(current->cred->egid);
1da177e4 LT	279	}
1da177e4 LT	280
1da177e4 LT	281	/*
	282	* sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
	283	*
	284	* This is really horribly ugly.
	285	*/
1df23957	286	#ifdef CONFIG_SYSVIPC
1da177e4 LT	287	asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
	288	{
	289	if (call >> 16) /* hack for backward compatibility */
	290	return -EINVAL;
1da177e4 LT	291	switch (call) {
	292	case SEMTIMEDOP:
	293	return compat_sys_semtimedop(first, compat_ptr(ptr),
	294	second, compat_ptr(third));
	295	case SEMOP:
	296	/* struct sembuf is the same on 32 and 64bit :)) */
	297	return sys_semtimedop(first, compat_ptr(ptr),
	298	second, NULL);
	299	case SEMGET:
	300	return sys_semget(first, second, third);
	301	case SEMCTL:
	302	return compat_sys_semctl(first, second, third,
	303	compat_ptr(ptr));
	304	case MSGSND:
	305	return compat_sys_msgsnd(first, second, third,
	306	compat_ptr(ptr));
	307	case MSGRCV:
	308	return compat_sys_msgrcv(first, second, 0, third,
	309	0, compat_ptr(ptr));
	310	case MSGGET:
	311	return sys_msgget((key_t) first, second);
	312	case MSGCTL:
	313	return compat_sys_msgctl(first, second, compat_ptr(ptr));
	314	case SHMAT:
	315	return compat_sys_shmat(first, second, third,
	316	0, compat_ptr(ptr));
	317	case SHMDT:
	318	return sys_shmdt(compat_ptr(ptr));
	319	case SHMGET:
	320	return sys_shmget(first, (unsigned)second, third);
	321	case SHMCTL:
	322	return compat_sys_shmctl(first, second, compat_ptr(ptr));
	323	}
	324
	325	return -ENOSYS;
	326	}
1df23957	327	#endif
1da177e4	328
24954a14	329	asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
1da177e4 LT	330	{
	331	if ((int)high < 0)
	332	return -EINVAL;
	333	else
	334	return sys_truncate(path, (high << 32) \| low);
	335	}
	336
	337	asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
	338	{
	339	if ((int)high < 0)
	340	return -EINVAL;
	341	else
	342	return sys_ftruncate(fd, (high << 32) \| low);
	343	}
	344
1da177e4 LT	345	asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
	346	struct compat_timespec __user *interval)
	347	{
	348	struct timespec t;
	349	int ret;
	350	mm_segment_t old_fs = get_fs ();
	351
	352	set_fs (KERNEL_DS);
2b67fc46 HC	353	ret = sys_sched_rr_get_interval(pid,
2b67fc46 HC	354	(struct timespec __force __user *) &t);
1da177e4 LT	355	set_fs (old_fs);
	356	if (put_compat_timespec(&t, interval))
	357	return -EFAULT;
	358	return ret;
	359	}
	360
	361	asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
	362	compat_sigset_t __user *oset, size_t sigsetsize)
	363	{
	364	sigset_t s;
	365	compat_sigset_t s32;
	366	int ret;
	367	mm_segment_t old_fs = get_fs();
	368
	369	if (set) {
	370	if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
	371	return -EFAULT;
399c1d8d	372	s.sig[0] = s32.sig[0] \| (((long)s32.sig[1]) << 32);
1da177e4 LT	373	}
1da177e4 LT	374	set_fs (KERNEL_DS);
d2c993d8	375	ret = sys_rt_sigprocmask(how,
2b67fc46 HC	376	set ? (sigset_t __force __user *) &s : NULL,
2b67fc46 HC	377	oset ? (sigset_t __force __user *) &s : NULL,
d2c993d8	378	sigsetsize);
1da177e4 LT	379	set_fs (old_fs);
	380	if (ret) return ret;
	381	if (oset) {
399c1d8d MS	382	s32.sig[1] = (s.sig[0] >> 32);
399c1d8d MS	383	s32.sig[0] = s.sig[0];
1da177e4 LT	384	if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
	385	return -EFAULT;
	386	}
	387	return 0;
	388	}
	389
	390	asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
	391	size_t sigsetsize)
	392	{
	393	sigset_t s;
	394	compat_sigset_t s32;
	395	int ret;
	396	mm_segment_t old_fs = get_fs();
	397
	398	set_fs (KERNEL_DS);
2b67fc46	399	ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
1da177e4 LT	400	set_fs (old_fs);
1da177e4 LT	401	if (!ret) {
399c1d8d MS	402	s32.sig[1] = (s.sig[0] >> 32);
399c1d8d MS	403	s32.sig[0] = s.sig[0];
1da177e4 LT	404	if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
	405	return -EFAULT;
	406	}
	407	return ret;
	408	}
	409
	410	asmlinkage long
	411	sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
	412	{
	413	siginfo_t info;
	414	int ret;
	415	mm_segment_t old_fs = get_fs();
	416
	417	if (copy_siginfo_from_user32(&info, uinfo))
	418	return -EFAULT;
	419	set_fs (KERNEL_DS);
2b67fc46	420	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
1da177e4 LT	421	set_fs (old_fs);
	422	return ret;
	423	}
	424
	425	/*
	426	* sys32_execve() executes a new program after the asm stub has set
	427	* things up for us. This should basically do what I want it to.
	428	*/
c7887325	429	asmlinkage long sys32_execve(const char __user name, compat_uptr_t __user argv,
3e86a8c6	430	compat_uptr_t __user *envp)
1da177e4	431	{
03ff9a23 MS	432	struct pt_regs *regs = task_pt_regs(current);
03ff9a23 MS	433	char *filename;
3e86a8c6 HC	434	long rc;
	435
	436	filename = getname(name);
	437	rc = PTR_ERR(filename);
	438	if (IS_ERR(filename))
	439	return rc;
	440	rc = compat_do_execve(filename, argv, envp, regs);
	441	if (rc)
	442	goto out;
03ff9a23 MS	443	current->thread.fp_regs.fpc=0;
03ff9a23 MS	444	asm volatile("sfpc %0,0" : : "d" (0));
3e86a8c6	445	rc = regs->gprs[2];
1da177e4	446	out:
3e86a8c6 HC	447	putname(filename);
3e86a8c6 HC	448	return rc;
1da177e4 LT	449	}
1da177e4 LT	450
24954a14	451	asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
1da177e4 LT	452	size_t count, u32 poshi, u32 poslo)
	453	{
	454	if ((compat_ssize_t) count < 0)
	455	return -EINVAL;
	456	return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) \| AA(poslo));
	457	}
	458
24954a14	459	asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
1da177e4 LT	460	size_t count, u32 poshi, u32 poslo)
	461	{
	462	if ((compat_ssize_t) count < 0)
	463	return -EINVAL;
	464	return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) \| AA(poslo));
	465	}
	466
	467	asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
	468	{
	469	return sys_readahead(fd, ((loff_t)AA(offhi) << 32) \| AA(offlo), count);
	470	}
	471
24954a14	472	asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
1da177e4 LT	473	{
	474	mm_segment_t old_fs = get_fs();
	475	int ret;
	476	off_t of;
	477
	478	if (offset && get_user(of, offset))
	479	return -EFAULT;
	480
	481	set_fs(KERNEL_DS);
d2c993d8	482	ret = sys_sendfile(out_fd, in_fd,
2b67fc46	483	offset ? (off_t __force __user *) &of : NULL, count);
1da177e4 LT	484	set_fs(old_fs);
1da177e4 LT	485
83b942bd	486	if (offset && put_user(of, offset))
1da177e4 LT	487	return -EFAULT;
	488
	489	return ret;
	490	}
	491
	492	asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
24954a14	493	compat_loff_t __user *offset, s32 count)
1da177e4 LT	494	{
	495	mm_segment_t old_fs = get_fs();
	496	int ret;
	497	loff_t lof;
	498
	499	if (offset && get_user(lof, offset))
	500	return -EFAULT;
	501
	502	set_fs(KERNEL_DS);
d2c993d8	503	ret = sys_sendfile64(out_fd, in_fd,
2b67fc46 HC	504	offset ? (loff_t __force __user *) &lof : NULL,
2b67fc46 HC	505	count);
1da177e4 LT	506	set_fs(old_fs);
	507
	508	if (offset && put_user(lof, offset))
	509	return -EFAULT;
	510
	511	return ret;
	512	}
	513
1da177e4 LT	514	struct stat64_emu31 {
	515	unsigned long long st_dev;
	516	unsigned int __pad1;
	517	#define STAT64_HAS_BROKEN_ST_INO 1
	518	u32 __st_ino;
	519	unsigned int st_mode;
	520	unsigned int st_nlink;
	521	u32 st_uid;
	522	u32 st_gid;
	523	unsigned long long st_rdev;
	524	unsigned int __pad3;
	525	long st_size;
	526	u32 st_blksize;
	527	unsigned char __pad4[4];
	528	u32 __pad5; /* future possible st_blocks high bits */
	529	u32 st_blocks; /* Number 512-byte blocks allocated. */
	530	u32 st_atime;
	531	u32 __pad6;
	532	u32 st_mtime;
	533	u32 __pad7;
	534	u32 st_ctime;
	535	u32 __pad8; /* will be high 32 bits of ctime someday */
	536	unsigned long st_ino;
	537	};
	538
24954a14	539	static int cp_stat64(struct stat64_emu31 __user ubuf, struct kstat stat)
1da177e4 LT	540	{
	541	struct stat64_emu31 tmp;
	542
	543	memset(&tmp, 0, sizeof(tmp));
	544
	545	tmp.st_dev = huge_encode_dev(stat->dev);
	546	tmp.st_ino = stat->ino;
	547	tmp.__st_ino = (u32)stat->ino;
	548	tmp.st_mode = stat->mode;
	549	tmp.st_nlink = (unsigned int)stat->nlink;
a7c1938e EB	550	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
a7c1938e EB	551	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4 LT	552	tmp.st_rdev = huge_encode_dev(stat->rdev);
	553	tmp.st_size = stat->size;
	554	tmp.st_blksize = (u32)stat->blksize;
	555	tmp.st_blocks = (u32)stat->blocks;
	556	tmp.st_atime = (u32)stat->atime.tv_sec;
	557	tmp.st_mtime = (u32)stat->mtime.tv_sec;
	558	tmp.st_ctime = (u32)stat->ctime.tv_sec;
	559
	560	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	561	}
	562
c7887325	563	asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4 LT	564	{
	565	struct kstat stat;
	566	int ret = vfs_stat(filename, &stat);
	567	if (!ret)
	568	ret = cp_stat64(statbuf, &stat);
	569	return ret;
	570	}
	571
c7887325	572	asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4 LT	573	{
	574	struct kstat stat;
	575	int ret = vfs_lstat(filename, &stat);
	576	if (!ret)
	577	ret = cp_stat64(statbuf, &stat);
	578	return ret;
	579	}
	580
24954a14	581	asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
1da177e4 LT	582	{
	583	struct kstat stat;
	584	int ret = vfs_fstat(fd, &stat);
	585	if (!ret)
	586	ret = cp_stat64(statbuf, &stat);
	587	return ret;
	588	}
	589
c7887325	590	asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
ed3d021b	591	struct stat64_emu31 __user* statbuf, int flag)
19bf9cbf HC	592	{
19bf9cbf HC	593	struct kstat stat;
0112fc22	594	int error;
19bf9cbf	595
0112fc22 OD	596	error = vfs_fstatat(dfd, filename, &stat, flag);
	597	if (error)
	598	return error;
	599	return cp_stat64(statbuf, &stat);
19bf9cbf HC	600	}
19bf9cbf HC	601
1da177e4 LT	602	/*
	603	* Linux/i386 didn't use to be able to handle more than
	604	* 4 system call parameters, so these system calls used a memory
	605	* block for parameter passing..
	606	*/
	607
	608	struct mmap_arg_struct_emu31 {
d3815898 HC	609	compat_ulong_t addr;
	610	compat_ulong_t len;
	611	compat_ulong_t prot;
	612	compat_ulong_t flags;
	613	compat_ulong_t fd;
	614	compat_ulong_t offset;
1da177e4 LT	615	};
1da177e4 LT	616
d3815898	617	asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
1da177e4 LT	618	{
1da177e4 LT	619	struct mmap_arg_struct_emu31 a;
1da177e4 LT	620
1da177e4 LT	621	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	622	return -EFAULT;
1da177e4	623	if (a.offset & ~PAGE_MASK)
d3815898 HC	624	return -EINVAL;
	625	a.addr = (unsigned long) compat_ptr(a.addr);
	626	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
	627	a.offset >> PAGE_SHIFT);
1da177e4 LT	628	}
1da177e4 LT	629
d3815898	630	asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
1da177e4 LT	631	{
1da177e4 LT	632	struct mmap_arg_struct_emu31 a;
1da177e4 LT	633
1da177e4 LT	634	if (copy_from_user(&a, arg, sizeof(a)))
d3815898 HC	635	return -EFAULT;
	636	a.addr = (unsigned long) compat_ptr(a.addr);
	637	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
1da177e4 LT	638	}
1da177e4 LT	639
24954a14	640	asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
1da177e4 LT	641	{
	642	if ((compat_ssize_t) count < 0)
	643	return -EINVAL;
	644
	645	return sys_read(fd, buf, count);
	646	}
	647
c7887325	648	asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
1da177e4 LT	649	{
	650	if ((compat_ssize_t) count < 0)
	651	return -EINVAL;
	652
	653	return sys_write(fd, buf, count);
	654	}
	655
068e1b94 MS	656	/*
	657	* 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
	658	* These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
	659	* because the 31 bit values differ from the 64 bit values.
	660	*/
	661
	662	asmlinkage long
	663	sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
	664	{
	665	if (advise == 4)
	666	advise = POSIX_FADV_DONTNEED;
	667	else if (advise == 5)
	668	advise = POSIX_FADV_NOREUSE;
	669	return sys_fadvise64(fd, offset, len, advise);
	670	}
	671
	672	struct fadvise64_64_args {
	673	int fd;
	674	long long offset;
	675	long long len;
	676	int advice;
	677	};
	678
	679	asmlinkage long
	680	sys32_fadvise64_64(struct fadvise64_64_args __user *args)
	681	{
	682	struct fadvise64_64_args a;
	683
	684	if ( copy_from_user(&a, args, sizeof(a)) )
	685	return -EFAULT;
	686	if (a.advice == 4)
	687	a.advice = POSIX_FADV_DONTNEED;
	688	else if (a.advice == 5)
	689	a.advice = POSIX_FADV_NOREUSE;
	690	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	691	}