arch/s390/kernel/compat_linux.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  *  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);
 }
	/*
	* 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);
	}