path: root/arch/sparc/kernel/sys_sunos.c

/* $Id: sys_sunos.c,v 1.137 2002/02/08 03:57:14 davem Exp $
 * sys_sunos.c: SunOS specific syscall compatibility support.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *
 * Based upon preliminary work which is:
 *
 * Copyright (C) 1995 Adrian M. Rodriguez (adrian@remus.rutgers.edu)
 *
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/resource.h>
#include <linux/ipc.h>
#include <linux/shm.h>
#include <linux/msg.h>
#include <linux/sem.h>
#include <linux/signal.h>
#include <linux/uio.h>
#include <linux/utsname.h>
#include <linux/major.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/syscalls.h>

#include <net/sock.h>

#include <asm/uaccess.h>
#ifndef KERNEL_DS
#include <linux/segment.h>
#endif

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pconf.h>
#include <asm/idprom.h> /* for gethostid() */
#include <asm/unistd.h>
#include <asm/system.h>

/* For the nfs mount emulation */
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_mount.h>

/* for sunos_select */
#include <linux/time.h>
#include <linux/personality.h>

/* NR_OPEN is now larger and dynamic in recent kernels. */
#define SUNOS_NR_OPEN	256

/* We use the SunOS mmap() semantics. */
asmlinkage unsigned long sunos_mmap(unsigned long addr, unsigned long len,
				    unsigned long prot, unsigned long flags,
				    unsigned long fd, unsigned long off)
{
	struct file * file = NULL;
	unsigned long retval, ret_type;

	if (flags & MAP_NORESERVE) {
		static int cnt;
		if (cnt++ < 10)
			printk("%s: unimplemented SunOS MAP_NORESERVE mmap() flag\n",
			       current->comm);
		flags &= ~MAP_NORESERVE;
	}
	retval = -EBADF;
	if (!(flags & MAP_ANONYMOUS)) {
		if (fd >= SUNOS_NR_OPEN)
			goto out;
		file = fget(fd);
		if (!file)
			goto out;
	}

	retval = -EINVAL;
	/* If this is ld.so or a shared library doing an mmap
	 * of /dev/zero, transform it into an anonymous mapping.
	 * SunOS is so stupid some times... hmph!
	 */
	if (file) {
		if (imajor(file->f_path.dentry->d_inode) == MEM_MAJOR &&
		    iminor(file->f_path.dentry->d_inode) == 5) {
			flags |= MAP_ANONYMOUS;
			fput(file);
			file = NULL;
		}
	}
	ret_type = flags & _MAP_NEW;
	flags &= ~_MAP_NEW;

	if (!(flags & MAP_FIXED))
		addr = 0;
	else {
		if (ARCH_SUN4C_SUN4 &&
		    (len > 0x20000000 ||
		     ((flags & MAP_FIXED) &&
		      addr < 0xe0000000 && addr + len > 0x20000000)))
			goto out_putf;

		/* See asm-sparc/uaccess.h */
		if (len > TASK_SIZE - PAGE_SIZE ||
		    addr<