[net-next-2.6.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/smp_lock.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"

long psw_user32_bits	= (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
			   PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
			   PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
long psw32_user_bits	= (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
			   PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
			   PSW32_MASK_PSTATE);
 
/* 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)
{
	int i;
	u16 group;

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

	return 0;
}

static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
{
	int i;
	u16 group;

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

	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;

	call &= 0xffff;

	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;
		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 __force __user *) &s : NULL,
				 oset ? (sigset_t __force __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_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) {
		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 __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(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 = stat->uid;
	tmp.st_gid = 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(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(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, 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, 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 LT	27	#include <linux/smp.h>
	28	#include <linux/smp_lock.h>
	29	#include <linux/sem.h>
	30	#include <linux/msg.h>
	31	#include <linux/shm.h>
1da177e4	32	#include <linux/uio.h>
1da177e4 LT	33	#include <linux/quota.h>
1da177e4 LT	34	#include <linux/module.h>
1da177e4 LT	35	#include <linux/poll.h>
	36	#include <linux/personality.h>
	37	#include <linux/stat.h>
	38	#include <linux/filter.h>
	39	#include <linux/highmem.h>
	40	#include <linux/highuid.h>
	41	#include <linux/mman.h>
	42	#include <linux/ipv6.h>
	43	#include <linux/in.h>
	44	#include <linux/icmpv6.h>
	45	#include <linux/syscalls.h>
	46	#include <linux/sysctl.h>
	47	#include <linux/binfmts.h>
a9415644	48	#include <linux/capability.h>
1da177e4 LT	49	#include <linux/compat.h>
	50	#include <linux/vfs.h>
	51	#include <linux/ptrace.h>
068e1b94	52	#include <linux/fadvise.h>
cba4fbbf	53	#include <linux/ipc.h>
5a0e3ad6	54	#include <linux/slab.h>
1da177e4 LT	55
1da177e4 LT	56	#include <asm/types.h>
1da177e4	57	#include <asm/uaccess.h>
1da177e4 LT	58
	59	#include <net/scm.h>
	60	#include <net/sock.h>
	61
	62	#include "compat_linux.h"
	63
c1821c2e GS	64	long psw_user32_bits = (PSW_BASE32_BITS \| PSW_MASK_DAT \| PSW_ASC_HOME \|
	65	PSW_MASK_IO \| PSW_MASK_EXT \| PSW_MASK_MCHECK \|
	66	PSW_MASK_PSTATE \| PSW_DEFAULT_KEY);
	67	long psw32_user_bits = (PSW32_BASE_BITS \| PSW32_MASK_DAT \| PSW32_ASC_HOME \|
	68	PSW32_MASK_IO \| PSW32_MASK_EXT \| PSW32_MASK_MCHECK \|
	69	PSW32_MASK_PSTATE);
1da177e4 LT	70
	71	/* For this source file, we want overflow handling. */
	72
	73	#undef high2lowuid
	74	#undef high2lowgid
	75	#undef low2highuid
	76	#undef low2highgid
	77	#undef SET_UID16
	78	#undef SET_GID16
	79	#undef NEW_TO_OLD_UID
	80	#undef NEW_TO_OLD_GID
	81	#undef SET_OLDSTAT_UID
	82	#undef SET_OLDSTAT_GID
	83	#undef SET_STAT_UID
	84	#undef SET_STAT_GID
	85
	86	#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
	87	#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
	88	#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
	89	#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
	90	#define SET_UID16(var, uid) var = high2lowuid(uid)
	91	#define SET_GID16(var, gid) var = high2lowgid(gid)
	92	#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
	93	#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
	94	#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	95	#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	96	#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	97	#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	98
24954a14	99	asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
1da177e4 LT	100	{
	101	return sys_chown(filename, low2highuid(user), low2highgid(group));
	102	}
	103
24954a14	104	asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
1da177e4 LT	105	{
	106	return sys_lchown(filename, low2highuid(user), low2highgid(group));
	107	}
	108
	109	asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
	110	{
	111	return sys_fchown(fd, low2highuid(user), low2highgid(group));
	112	}
	113
	114	asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
	115	{
	116	return sys_setregid(low2highgid(rgid), low2highgid(egid));
	117	}
	118
	119	asmlinkage long sys32_setgid16(u16 gid)
	120	{
	121	return sys_setgid((gid_t)gid);
	122	}
	123
	124	asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
	125	{
	126	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
	127	}
	128
	129	asmlinkage long sys32_setuid16(u16 uid)
	130	{
	131	return sys_setuid((uid_t)uid);
	132	}
	133
	134	asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
	135	{
	136	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
	137	low2highuid(suid));
	138	}
	139
24954a14	140	asmlinkage long sys32_getresuid16(u16 __user ruid, u16 __user euid, u16 __user *suid)
1da177e4 LT	141	{
	142	int retval;
	143
b6dff3ec DH	144	if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
	145	!(retval = put_user(high2lowuid(current->cred->euid), euid)))
	146	retval = put_user(high2lowuid(current->cred->suid), suid);
1da177e4 LT	147
	148	return retval;
	149	}
	150
	151	asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
	152	{
	153	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
	154	low2highgid(sgid));
	155	}
	156
24954a14	157	asmlinkage long sys32_getresgid16(u16 __user rgid, u16 __user egid, u16 __user *sgid)
1da177e4 LT	158	{
	159	int retval;
	160
b6dff3ec DH	161	if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
	162	!(retval = put_user(high2lowgid(current->cred->egid), egid)))
	163	retval = put_user(high2lowgid(current->cred->sgid), sgid);
1da177e4 LT	164
	165	return retval;
	166	}
	167
	168	asmlinkage long sys32_setfsuid16(u16 uid)
	169	{
	170	return sys_setfsuid((uid_t)uid);
	171	}
	172
	173	asmlinkage long sys32_setfsgid16(u16 gid)
	174	{
	175	return sys_setfsgid((gid_t)gid);
	176	}
	177
24954a14	178	static int groups16_to_user(u16 __user grouplist, struct group_info group_info)
1da177e4 LT	179	{
	180	int i;
	181	u16 group;
	182
	183	for (i = 0; i < group_info->ngroups; i++) {
	184	group = (u16)GROUP_AT(group_info, i);
	185	if (put_user(group, grouplist+i))
	186	return -EFAULT;
	187	}
	188
	189	return 0;
	190	}
	191
24954a14	192	static int groups16_from_user(struct group_info group_info, u16 __user grouplist)
1da177e4 LT	193	{
	194	int i;
	195	u16 group;
	196
	197	for (i = 0; i < group_info->ngroups; i++) {
	198	if (get_user(group, grouplist+i))
	199	return -EFAULT;
	200	GROUP_AT(group_info, i) = (gid_t)group;
	201	}
	202
	203	return 0;
	204	}
	205
24954a14	206	asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4 LT	207	{
	208	int i;
	209
	210	if (gidsetsize < 0)
	211	return -EINVAL;
	212
b6dff3ec DH	213	get_group_info(current->cred->group_info);
b6dff3ec DH	214	i = current->cred->group_info->ngroups;
1da177e4 LT	215	if (gidsetsize) {
	216	if (i > gidsetsize) {
	217	i = -EINVAL;
	218	goto out;
	219	}
b6dff3ec	220	if (groups16_to_user(grouplist, current->cred->group_info)) {
1da177e4 LT	221	i = -EFAULT;
	222	goto out;
	223	}
	224	}
	225	out:
b6dff3ec	226	put_group_info(current->cred->group_info);
1da177e4 LT	227	return i;
	228	}
	229
24954a14	230	asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4 LT	231	{
	232	struct group_info *group_info;
	233	int retval;
	234
	235	if (!capable(CAP_SETGID))
	236	return -EPERM;
	237	if ((unsigned)gidsetsize > NGROUPS_MAX)
	238	return -EINVAL;
	239
	240	group_info = groups_alloc(gidsetsize);
	241	if (!group_info)
	242	return -ENOMEM;
	243	retval = groups16_from_user(group_info, grouplist);
	244	if (retval) {
	245	put_group_info(group_info);
	246	return retval;
	247	}
	248
	249	retval = set_current_groups(group_info);
	250	put_group_info(group_info);
	251
	252	return retval;
	253	}
	254
	255	asmlinkage long sys32_getuid16(void)
	256	{
b6dff3ec	257	return high2lowuid(current->cred->uid);
1da177e4 LT	258	}
	259
	260	asmlinkage long sys32_geteuid16(void)
	261	{
b6dff3ec	262	return high2lowuid(current->cred->euid);
1da177e4 LT	263	}
	264
	265	asmlinkage long sys32_getgid16(void)
	266	{
b6dff3ec	267	return high2lowgid(current->cred->gid);
1da177e4 LT	268	}
	269
	270	asmlinkage long sys32_getegid16(void)
	271	{
b6dff3ec	272	return high2lowgid(current->cred->egid);
1da177e4 LT	273	}
1da177e4 LT	274
1da177e4 LT	275	/*
	276	* sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
	277	*
	278	* This is really horribly ugly.
	279	*/
1df23957	280	#ifdef CONFIG_SYSVIPC
1da177e4 LT	281	asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
	282	{
	283	if (call >> 16) /* hack for backward compatibility */
	284	return -EINVAL;
	285
	286	call &= 0xffff;
	287
	288	switch (call) {
	289	case SEMTIMEDOP:
	290	return compat_sys_semtimedop(first, compat_ptr(ptr),
	291	second, compat_ptr(third));
	292	case SEMOP:
	293	/* struct sembuf is the same on 32 and 64bit :)) */
	294	return sys_semtimedop(first, compat_ptr(ptr),
	295	second, NULL);
	296	case SEMGET:
	297	return sys_semget(first, second, third);
	298	case SEMCTL:
	299	return compat_sys_semctl(first, second, third,
	300	compat_ptr(ptr));
	301	case MSGSND:
	302	return compat_sys_msgsnd(first, second, third,
	303	compat_ptr(ptr));
	304	case MSGRCV:
	305	return compat_sys_msgrcv(first, second, 0, third,
	306	0, compat_ptr(ptr));
	307	case MSGGET:
	308	return sys_msgget((key_t) first, second);
	309	case MSGCTL:
	310	return compat_sys_msgctl(first, second, compat_ptr(ptr));
	311	case SHMAT:
	312	return compat_sys_shmat(first, second, third,
	313	0, compat_ptr(ptr));
	314	case SHMDT:
	315	return sys_shmdt(compat_ptr(ptr));
	316	case SHMGET:
	317	return sys_shmget(first, (unsigned)second, third);
	318	case SHMCTL:
	319	return compat_sys_shmctl(first, second, compat_ptr(ptr));
	320	}
	321
	322	return -ENOSYS;
	323	}
1df23957	324	#endif
1da177e4	325
24954a14	326	asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
1da177e4 LT	327	{
	328	if ((int)high < 0)
	329	return -EINVAL;
	330	else
	331	return sys_truncate(path, (high << 32) \| low);
	332	}
	333
	334	asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
	335	{
	336	if ((int)high < 0)
	337	return -EINVAL;
	338	else
	339	return sys_ftruncate(fd, (high << 32) \| low);
	340	}
	341
1da177e4 LT	342	asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
	343	struct compat_timespec __user *interval)
	344	{
	345	struct timespec t;
	346	int ret;
	347	mm_segment_t old_fs = get_fs ();
	348
	349	set_fs (KERNEL_DS);
2b67fc46 HC	350	ret = sys_sched_rr_get_interval(pid,
2b67fc46 HC	351	(struct timespec __force __user *) &t);
1da177e4 LT	352	set_fs (old_fs);
	353	if (put_compat_timespec(&t, interval))
	354	return -EFAULT;
	355	return ret;
	356	}
	357
	358	asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
	359	compat_sigset_t __user *oset, size_t sigsetsize)
	360	{
	361	sigset_t s;
	362	compat_sigset_t s32;
	363	int ret;
	364	mm_segment_t old_fs = get_fs();
	365
	366	if (set) {
	367	if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
	368	return -EFAULT;
	369	switch (_NSIG_WORDS) {
	370	case 4: s.sig[3] = s32.sig[6] \| (((long)s32.sig[7]) << 32);
	371	case 3: s.sig[2] = s32.sig[4] \| (((long)s32.sig[5]) << 32);
	372	case 2: s.sig[1] = s32.sig[2] \| (((long)s32.sig[3]) << 32);
	373	case 1: s.sig[0] = s32.sig[0] \| (((long)s32.sig[1]) << 32);
	374	}
	375	}
	376	set_fs (KERNEL_DS);
d2c993d8	377	ret = sys_rt_sigprocmask(how,
2b67fc46 HC	378	set ? (sigset_t __force __user *) &s : NULL,
2b67fc46 HC	379	oset ? (sigset_t __force __user *) &s : NULL,
d2c993d8	380	sigsetsize);
1da177e4 LT	381	set_fs (old_fs);
	382	if (ret) return ret;
	383	if (oset) {
	384	switch (_NSIG_WORDS) {
	385	case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
	386	case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
	387	case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
	388	case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
	389	}
	390	if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
	391	return -EFAULT;
	392	}
	393	return 0;
	394	}
	395
	396	asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
	397	size_t sigsetsize)
	398	{
	399	sigset_t s;
	400	compat_sigset_t s32;
	401	int ret;
	402	mm_segment_t old_fs = get_fs();
	403
	404	set_fs (KERNEL_DS);
2b67fc46	405	ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
1da177e4 LT	406	set_fs (old_fs);
	407	if (!ret) {
	408	switch (_NSIG_WORDS) {
	409	case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
	410	case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
	411	case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
	412	case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
	413	}
	414	if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
	415	return -EFAULT;
	416	}
	417	return ret;
	418	}
	419
	420	asmlinkage long
	421	sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
	422	{
	423	siginfo_t info;
	424	int ret;
	425	mm_segment_t old_fs = get_fs();
	426
	427	if (copy_siginfo_from_user32(&info, uinfo))
	428	return -EFAULT;
	429	set_fs (KERNEL_DS);
2b67fc46	430	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
1da177e4 LT	431	set_fs (old_fs);
	432	return ret;
	433	}
	434
	435	/*
	436	* sys32_execve() executes a new program after the asm stub has set
	437	* things up for us. This should basically do what I want it to.
	438	*/
3e86a8c6 HC	439	asmlinkage long sys32_execve(char __user name, compat_uptr_t __user argv,
3e86a8c6 HC	440	compat_uptr_t __user *envp)
1da177e4	441	{
03ff9a23 MS	442	struct pt_regs *regs = task_pt_regs(current);
03ff9a23 MS	443	char *filename;
3e86a8c6 HC	444	long rc;
	445
	446	filename = getname(name);
	447	rc = PTR_ERR(filename);
	448	if (IS_ERR(filename))
	449	return rc;
	450	rc = compat_do_execve(filename, argv, envp, regs);
	451	if (rc)
	452	goto out;
03ff9a23 MS	453	current->thread.fp_regs.fpc=0;
03ff9a23 MS	454	asm volatile("sfpc %0,0" : : "d" (0));
3e86a8c6	455	rc = regs->gprs[2];
1da177e4	456	out:
3e86a8c6 HC	457	putname(filename);
3e86a8c6 HC	458	return rc;
1da177e4 LT	459	}
1da177e4 LT	460
24954a14	461	asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
1da177e4 LT	462	size_t count, u32 poshi, u32 poslo)
	463	{
	464	if ((compat_ssize_t) count < 0)
	465	return -EINVAL;
	466	return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) \| AA(poslo));
	467	}
	468
24954a14	469	asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
1da177e4 LT	470	size_t count, u32 poshi, u32 poslo)
	471	{
	472	if ((compat_ssize_t) count < 0)
	473	return -EINVAL;
	474	return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) \| AA(poslo));
	475	}
	476
	477	asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
	478	{
	479	return sys_readahead(fd, ((loff_t)AA(offhi) << 32) \| AA(offlo), count);
	480	}
	481
24954a14	482	asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
1da177e4 LT	483	{
	484	mm_segment_t old_fs = get_fs();
	485	int ret;
	486	off_t of;
	487
	488	if (offset && get_user(of, offset))
	489	return -EFAULT;
	490
	491	set_fs(KERNEL_DS);
d2c993d8	492	ret = sys_sendfile(out_fd, in_fd,
2b67fc46	493	offset ? (off_t __force __user *) &of : NULL, count);
1da177e4 LT	494	set_fs(old_fs);
1da177e4 LT	495
83b942bd	496	if (offset && put_user(of, offset))
1da177e4 LT	497	return -EFAULT;
	498
	499	return ret;
	500	}
	501
	502	asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
24954a14	503	compat_loff_t __user *offset, s32 count)
1da177e4 LT	504	{
	505	mm_segment_t old_fs = get_fs();
	506	int ret;
	507	loff_t lof;
	508
	509	if (offset && get_user(lof, offset))
	510	return -EFAULT;
	511
	512	set_fs(KERNEL_DS);
d2c993d8	513	ret = sys_sendfile64(out_fd, in_fd,
2b67fc46 HC	514	offset ? (loff_t __force __user *) &lof : NULL,
2b67fc46 HC	515	count);
1da177e4 LT	516	set_fs(old_fs);
	517
	518	if (offset && put_user(lof, offset))
	519	return -EFAULT;
	520
	521	return ret;
	522	}
	523
1da177e4 LT	524	struct stat64_emu31 {
	525	unsigned long long st_dev;
	526	unsigned int __pad1;
	527	#define STAT64_HAS_BROKEN_ST_INO 1
	528	u32 __st_ino;
	529	unsigned int st_mode;
	530	unsigned int st_nlink;
	531	u32 st_uid;
	532	u32 st_gid;
	533	unsigned long long st_rdev;
	534	unsigned int __pad3;
	535	long st_size;
	536	u32 st_blksize;
	537	unsigned char __pad4[4];
	538	u32 __pad5; /* future possible st_blocks high bits */
	539	u32 st_blocks; /* Number 512-byte blocks allocated. */
	540	u32 st_atime;
	541	u32 __pad6;
	542	u32 st_mtime;
	543	u32 __pad7;
	544	u32 st_ctime;
	545	u32 __pad8; /* will be high 32 bits of ctime someday */
	546	unsigned long st_ino;
	547	};
	548
24954a14	549	static int cp_stat64(struct stat64_emu31 __user ubuf, struct kstat stat)
1da177e4 LT	550	{
	551	struct stat64_emu31 tmp;
	552
	553	memset(&tmp, 0, sizeof(tmp));
	554
	555	tmp.st_dev = huge_encode_dev(stat->dev);
	556	tmp.st_ino = stat->ino;
	557	tmp.__st_ino = (u32)stat->ino;
	558	tmp.st_mode = stat->mode;
	559	tmp.st_nlink = (unsigned int)stat->nlink;
	560	tmp.st_uid = stat->uid;
	561	tmp.st_gid = stat->gid;
	562	tmp.st_rdev = huge_encode_dev(stat->rdev);
	563	tmp.st_size = stat->size;
	564	tmp.st_blksize = (u32)stat->blksize;
	565	tmp.st_blocks = (u32)stat->blocks;
	566	tmp.st_atime = (u32)stat->atime.tv_sec;
	567	tmp.st_mtime = (u32)stat->mtime.tv_sec;
	568	tmp.st_ctime = (u32)stat->ctime.tv_sec;
	569
	570	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	571	}
	572
24954a14	573	asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4 LT	574	{
	575	struct kstat stat;
	576	int ret = vfs_stat(filename, &stat);
	577	if (!ret)
	578	ret = cp_stat64(statbuf, &stat);
	579	return ret;
	580	}
	581
24954a14	582	asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4 LT	583	{
	584	struct kstat stat;
	585	int ret = vfs_lstat(filename, &stat);
	586	if (!ret)
	587	ret = cp_stat64(statbuf, &stat);
	588	return ret;
	589	}
	590
24954a14	591	asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
1da177e4 LT	592	{
	593	struct kstat stat;
	594	int ret = vfs_fstat(fd, &stat);
	595	if (!ret)
	596	ret = cp_stat64(statbuf, &stat);
	597	return ret;
	598	}
	599
ed3d021b HC	600	asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
ed3d021b HC	601	struct stat64_emu31 __user* statbuf, int flag)
19bf9cbf HC	602	{
19bf9cbf HC	603	struct kstat stat;
0112fc22	604	int error;
19bf9cbf	605
0112fc22 OD	606	error = vfs_fstatat(dfd, filename, &stat, flag);
	607	if (error)
	608	return error;
	609	return cp_stat64(statbuf, &stat);
19bf9cbf HC	610	}
19bf9cbf HC	611
1da177e4 LT	612	/*
	613	* Linux/i386 didn't use to be able to handle more than
	614	* 4 system call parameters, so these system calls used a memory
	615	* block for parameter passing..
	616	*/
	617
	618	struct mmap_arg_struct_emu31 {
d3815898 HC	619	compat_ulong_t addr;
	620	compat_ulong_t len;
	621	compat_ulong_t prot;
	622	compat_ulong_t flags;
	623	compat_ulong_t fd;
	624	compat_ulong_t offset;
1da177e4 LT	625	};
1da177e4 LT	626
d3815898	627	asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
1da177e4 LT	628	{
1da177e4 LT	629	struct mmap_arg_struct_emu31 a;
1da177e4 LT	630
1da177e4 LT	631	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	632	return -EFAULT;
1da177e4	633	if (a.offset & ~PAGE_MASK)
d3815898 HC	634	return -EINVAL;
	635	a.addr = (unsigned long) compat_ptr(a.addr);
	636	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
	637	a.offset >> PAGE_SHIFT);
1da177e4 LT	638	}
1da177e4 LT	639
d3815898	640	asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
1da177e4 LT	641	{
1da177e4 LT	642	struct mmap_arg_struct_emu31 a;
1da177e4 LT	643
1da177e4 LT	644	if (copy_from_user(&a, arg, sizeof(a)))
d3815898 HC	645	return -EFAULT;
	646	a.addr = (unsigned long) compat_ptr(a.addr);
	647	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
1da177e4 LT	648	}
1da177e4 LT	649
24954a14	650	asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
1da177e4 LT	651	{
	652	if ((compat_ssize_t) count < 0)
	653	return -EINVAL;
	654
	655	return sys_read(fd, buf, count);
	656	}
	657
24954a14	658	asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
1da177e4 LT	659	{
	660	if ((compat_ssize_t) count < 0)
	661	return -EINVAL;
	662
	663	return sys_write(fd, buf, count);
	664	}
	665
068e1b94 MS	666	/*
	667	* 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
	668	* These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
	669	* because the 31 bit values differ from the 64 bit values.
	670	*/
	671
	672	asmlinkage long
	673	sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
	674	{
	675	if (advise == 4)
	676	advise = POSIX_FADV_DONTNEED;
	677	else if (advise == 5)
	678	advise = POSIX_FADV_NOREUSE;
	679	return sys_fadvise64(fd, offset, len, advise);
	680	}
	681
	682	struct fadvise64_64_args {
	683	int fd;
	684	long long offset;
	685	long long len;
	686	int advice;
	687	};
	688
	689	asmlinkage long
	690	sys32_fadvise64_64(struct fadvise64_64_args __user *args)
	691	{
	692	struct fadvise64_64_args a;
	693
	694	if ( copy_from_user(&a, args, sizeof(a)) )
	695	return -EFAULT;
	696	if (a.advice == 4)
	697	a.advice = POSIX_FADV_DONTNEED;
	698	else if (a.advice == 5)
	699	a.advice = POSIX_FADV_NOREUSE;
	700	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	701	}