compat/linux/linux_misc.c

/*-
 * Copyright (c) 1994-1995 S�ren Schmidt
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software withough specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  $Id: linux_misc.c,v 1.48 1998/12/19 02:55:33 julian Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/kernel.h>
#include <sys/mman.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/imgact_aout.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#ifdef COMPAT_LINUX_THREADS
#include <sys/unistd.h>
#endif /* COMPAT_LINUX_THREADS */
#include <sys/vnode.h>
#include <sys/wait.h>
#include <sys/time.h>

#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_kern.h>
#include <vm/vm_prot.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>

#include <machine/frame.h>
#include <machine/psl.h>

#include <i386/linux/linux.h>
#include <i386/linux/linux_proto.h>
#include <i386/linux/linux_util.h>

int
linux_alarm(struct proc *p, struct linux_alarm_args *args)
{
    struct itimerval it, old_it;
    struct timeval tv;
    int s;

#ifdef DEBUG
    printf("Linux-emul(%ld): alarm(%u)\n", (long)p->p_pid, args->secs);
#endif
    if (args->secs > 100000000)
	return EINVAL;
    it.it_value.tv_sec = (long)args->secs;
    it.it_value.tv_usec = 0;
    it.it_interval.tv_sec = 0;
    it.it_interval.tv_usec = 0;
    s = splsoftclock();
    old_it = p->p_realtimer;
    getmicrouptime(&tv);
    if (timevalisset(&old_it.it_value))
	untimeout(realitexpire, (caddr_t)p, p->p_ithandle);
    if (it.it_value.tv_sec != 0) {
	p->p_ithandle = timeout(realitexpire, (caddr_t)p, tvtohz(&it.it_value));
	timevaladd(&it.it_value, &tv);
    }
    p->p_realtimer = it;
    splx(s);
    if (timevalcmp(&old_it.it_value, &tv, >)) {
	timevalsub(&old_it.it_value, &tv);
	if (old_it.it_value.tv_usec != 0)
	    old_it.it_value.tv_sec++;
	p->p_retval[0] = old_it.it_value.tv_sec;
    }
    return 0;
}

int
linux_brk(struct proc *p, struct linux_brk_args *args)
{
#if 0
    struct vmspace *vm = p->p_vmspace;
    vm_offset_t new, old;
    int error;

    if ((vm_offset_t)args->dsend < (vm_offset_t)vm->vm_daddr)
	return EINVAL;
    if (((caddr_t)args->dsend - (caddr_t)vm->vm_daddr)
	> p->p_rlimit[RLIMIT_DATA].rlim_cur)
	return ENOMEM;

    old = round_page((vm_offset_t)vm->vm_daddr) + ctob(vm->vm_dsize);
    new = round_page((vm_offset_t)args->dsend);
    p->p_retval[0] = old;
    if ((new-old) > 0) {
	if (swap_pager_full)
	    return ENOMEM;
	error = vm_map_find(&vm->vm_map, NULL, 0, &old, (new-old), FALSE,
			VM_PROT_ALL, VM_PROT_ALL, 0);
	if (error)
	    return error;
	vm->vm_dsize += btoc((new-old));
	p->p_retval[0] = (int)(vm->vm_daddr + ctob(vm->vm_dsize));
    }
    return 0;
#else
    struct vmspace *vm = p->p_vmspace;
    vm_offset_t new, old;
    struct obreak_args /* {
	char * nsize;
    } */ tmp;

#ifdef DEBUG
    printf("Linux-emul(%ld): brk(%p)\n", (long)p->p_pid, (void *)args->dsend);
#endif
    old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
    new = (vm_offset_t)args->dsend;
    tmp.nsize = (char *) new;
    if (((caddr_t)new > vm->vm_daddr) && !obreak(p, &tmp))
	p->p_retval[0] = (int)new;
    else
	p->p_retval[0] = (int)old;

    return 0;
#endif
}

int
linux_uselib(struct proc *p, struct linux_uselib_args *args)
{
    struct nameidata ni;
    struct vnode *vp;
    struct exec *a_out;
    struct vattr attr;
    vm_offset_t vmaddr;
    unsigned long file_offset;
    vm_offset_t buffer;
    unsigned long bss_size;
    int error;
    caddr_t sg;
    int locked;

    sg = stackgap_init();
    CHECKALTEXIST(p, &sg, args->library);

#ifdef DEBUG
    printf("Linux-emul(%d): uselib(%s)\n", p->p_pid, args->library);
#endif

    a_out = NULL;
    locked = 0;
    vp = NULL;

    NDINIT(&ni, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, args->library, p);
    if (error = namei(&ni))
	goto cleanup;

    vp = ni.ni_vp;
    if (vp == NULL) {
	error = ENOEXEC;	/* ?? */
	goto cleanup;
    }

    /*
     * From here on down, we have a locked vnode that must be unlocked.
     */
    locked++;

    /*
     * Writable?
     */
    if (vp->v_writecount) {
	error = ETXTBSY;
	goto cleanup;
    }

    /*
     * Executable?
     */
    if (error = VOP_GETATTR(vp, &attr, p->p_ucred, p))
	goto cleanup;

    if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
	((attr.va_mode & 0111) == 0) ||
	(attr.va_type != VREG)) {
	    error = ENOEXEC;
	    goto cleanup;
    }

    /*
     * Sensible size?
     */
    if (attr.va_size == 0) {
	error = ENOEXEC;
	goto cleanup;
    }

    /*
     * Can we access it?
     */
    if (error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p))
	goto cleanup;

    if (error = VOP_OPEN(vp, FREAD, p->p_ucred, p))
	goto cleanup;

    /*
     * Lock no longer needed
     */
    VOP_UNLOCK(vp, 0, p);
    locked = 0;

    /*
     * Pull in executable header into kernel_map
     */
    error = vm_mmap(kernel_map, (vm_offset_t *)&a_out, PAGE_SIZE,
	    	    VM_PROT_READ, VM_PROT_READ, 0, (caddr_t)vp, 0);
    if (error)
	goto cleanup;

    /*
     * Is it a Linux binary ?
     */
    if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
	error = ENOEXEC;
	goto cleanup;
    }

    /* While we are here, we should REALLY do some more checks */

    /*
     * Set file/virtual offset based on a.out variant.
     */
    switch ((int)(a_out->a_magic & 0xffff)) {
    case 0413:	/* ZMAGIC */
	file_offset = 1024;
	break;
    case 0314:	/* QMAGIC */
	file_offset = 0;
	break;
    default:
	error = ENOEXEC;
	goto cleanup;
    }

    bss_size = round_page(a_out->a_bss);

    /*
     * Check various fields in header for validity/bounds.
     */
    if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
	error = ENOEXEC;
	goto cleanup;
    }

    /* text + data can't exceed file size */
    if (a_out->a_data + a_out->a_text > attr.va_size) {
	error = EFAULT;
	goto cleanup;
    }

    /*
     * text/data/bss must not exceed limits
     * XXX: this is not complete. it should check current usage PLUS
     * the resources needed by this library.
     */
    if (a_out->a_text > MAXTSIZ ||
	a_out->a_data + bss_size > p->p_rlimit[RLIMIT_DATA].rlim_cur) {
	error = ENOMEM;
	goto cleanup;
    }

    /*
     * prevent more writers
     */
    vp->v_flag |= VTEXT;

    /*
     * Check if file_offset page aligned,.
     * Currently we cannot handle misalinged file offsets,
     * and so we read in the entire image (what a waste).
     */
    if (file_offset & PAGE_MASK) {
#ifdef DEBUG
printf("uselib: Non page aligned binary %lu\n", file_offset);
#endif
	/*
	 * Map text+data read/write/execute
	 */

	/* a_entry is the load address and is page aligned */
	vmaddr = trunc_page(a_out->a_entry);

	/* get anon user mapping, read+write+execute */
	error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &vmaddr,
		    	    a_out->a_text + a_out->a_data, FALSE,
			    VM_PROT_ALL, VM_PROT_ALL, 0);
	if (error)
	    goto cleanup;

	/* map file into kernel_map */
	error = vm_mmap(kernel_map, &buffer,
			round_page(a_out->a_text + a_out->a_data + file_offset),
		   	VM_PROT_READ, VM_PROT_READ, 0,
			(caddr_t)vp, trunc_page(file_offset));
	if (error)
	    goto cleanup;

	/* copy from kernel VM space to user space */
	error = copyout((caddr_t)(void *)(uintptr_t)(buffer + file_offset),
			(caddr_t)vmaddr, a_out->a_text + a_out->a_data);

	/* release temporary kernel space */
	vm_map_remove(kernel_map, buffer,
		      buffer + round_page(a_out->a_text + a_out->a_data + file_offset));

	if (error)
	    goto cleanup;
    }
    else {
#ifdef DEBUG
printf("uselib: Page aligned binary %lu\n", file_offset);
#endif
	/*
	 * for QMAGIC, a_entry is 20 bytes beyond the load address
	 * to skip the executable header
	 */
	vmaddr = trunc_page(a_out->a_entry);

	/*
	 * Map it all into the process's space as a single copy-on-write
	 * "data" segment.
	 */
	error = vm_mmap(&p->p_vmspace->vm_map, &vmaddr,
		   	a_out->a_text + a_out->a_data,
			VM_PROT_ALL, VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
			(caddr_t)vp, file_offset);
	if (error)
	    goto cleanup;
    }
#ifdef DEBUG
printf("mem=%08x = %08x %08x\n", vmaddr, ((int*)vmaddr)[0], ((int*)vmaddr)[1]);
#endif
    if (bss_size != 0) {
        /*
	 * Calculate BSS start address
	 */
	vmaddr = trunc_page(a_out->a_entry) + a_out->a_text + a_out->a_data;

	/*
	 * allocate some 'anon' space
	 */
	error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &vmaddr,
			    bss_size, FALSE,
			    VM_PROT_ALL, VM_PROT_ALL, 0);
	if (error)
	    goto cleanup;
    }

cleanup:
    /*
     * Unlock vnode if needed
     */
    if (locked)
	VOP_UNLOCK(vp, 0, p);

    /*
     * Release the kernel mapping.
     */
    if (a_out)
	vm_map_remove(kernel_map, (vm_offset_t)a_out, (vm_offset_t)a_out + PAGE_SIZE);

    return error;
}

/* XXX move */
struct linux_select_argv {
	int nfds;
	fd_set *readfds;
	fd_set *writefds;
	fd_set *exceptfds;
	struct timeval *timeout;
};

int
linux_select(struct proc *p, struct linux_select_args *args)
{
    struct linux_select_argv linux_args;
    struct linux_newselect_args newsel;
    int error;

#ifdef SELECT_DEBUG
    printf("Linux-emul(%d): select(%x)\n",
	   p->p_pid, args->ptr);
#endif
    if ((error = copyin((caddr_t)args->ptr, (caddr_t)&linux_args,
			sizeof(linux_args))))
	return error;

    newsel.nfds = linux_args.nfds;
    newsel.readfds = linux_args.readfds;
    newsel.writefds = linux_args.writefds;
    newsel.exceptfds = linux_args.exceptfds;
    newsel.timeout = linux_args.timeout;

    return linux_newselect(p, &newsel);
}

int
linux_newselect(struct proc *p, struct linux_newselect_args *args)
{
    struct select_args bsa;
    struct timeval tv0, tv1, utv, *tvp;
    caddr_t sg;
    int error;

#ifdef DEBUG
    printf("Linux-emul(%ld): newselect(%d, %p, %p, %p, %p)\n",
  	(long)p->p_pid, args->nfds, (void *)args->readfds,
	(void *)args->writefds, (void *)args->exceptfds,
	(void *)args->timeout);
#endif
    error = 0;
    bsa.nd = args->nfds;
    bsa.in = args->readfds;
    bsa.ou = args->writefds;
    bsa.ex = args->exceptfds;
    bsa.tv = args->timeout;

    /*
     * Store current time for computation of the amount of
     * time left.
     */
    if (args->timeout) {
	if ((error = copyin(args->timeout, &utv, sizeof(utv))))
	    goto select_out;
#ifdef DEBUG
	printf("Linux-emul(%ld): incoming timeout (%ld/%ld)\n",
	    (long)p->p_pid, utv.tv_sec, utv.tv_usec);
#endif
	if (itimerfix(&utv)) {
	    /*
	     * The timeval was invalid.  Convert it to something
	     * valid that will act as it does under Linux.
	     */
	    sg = stackgap_init();
	    tvp = stackgap_alloc(&sg, sizeof(utv));
	    utv.tv_sec += utv.tv_usec / 1000000;
	    utv.tv_usec %= 1000000;
	    if (utv.tv_usec < 0) {
		utv.tv_sec -= 1;
		utv.tv_usec += 1000000;
	    }
	    if (utv.tv_sec < 0)
		timevalclear(&utv);
	    if ((error = copyout(&utv, tvp, sizeof(utv))))
		goto select_out;
	    bsa.tv = tvp;
	}
	microtime(&tv0);
    }

    error = select(p, &bsa);
#ifdef DEBUG
    printf("Linux-emul(%d): real select returns %d\n",
	       p->p_pid, error);
#endif

    if (error) {
	/*
	 * See fs/select.c in the Linux kernel.  Without this,
	 * Maelstrom doesn't work.
	 */
	if (error == ERESTART)
	    error = EINTR;
	goto select_out;
    }

    if (args->timeout) {
	if (p->p_retval[0]) {
	    /*
	     * Compute how much time was left of the timeout,
	     * by subtracting the current time and the time
	     * before we started the call, and subtracting
	     * that result from the user-supplied value.
	     */
	    microtime(&tv1);
	    timevalsub(&tv1, &tv0);
	    timevalsub(&utv, &tv1);
	    if (utv.tv_sec < 0)
		timevalclear(&utv);
	} else
	    timevalclear(&utv);
#ifdef DEBUG
	printf("Linux-emul(%ld): outgoing timeout (%ld/%ld)\n",
	    (long)p->p_pid, utv.tv_sec, utv.tv_usec);
#endif
	if ((error = copyout(&utv, args->timeout, sizeof(utv))))
	    goto select_out;
    }

select_out:
#ifdef DEBUG
    printf("Linux-emul(%d): newselect_out -> %d\n",
	       p->p_pid, error);
#endif
    return error;
}

int
linux_getpgid(struct proc *p, struct linux_getpgid_args *args)
{
    struct proc *curproc;

#ifdef DEBUG
    printf("Linux-emul(%d): getpgid(%d)\n", p->p_pid, args->pid);
#endif
    if (args->pid != p->p_pid) {
	if (!(curproc = pfind(args->pid)))
	    return ESRCH;
    }
    else
	curproc = p;
    p->p_retval[0] = curproc->p_pgid;
    return 0;
}

int
linux_fork(struct proc *p, struct linux_fork_args *args)
{
    int error;

#ifdef DEBUG
    printf("Linux-emul(%d): fork()\n", p->p_pid);
#endif
    if (error = fork(p, (struct fork_args *)args))
	return error;
    if (p->p_retval[1] == 1)
	p->p_retval[0] = 0;
    return 0;
}

#ifndef COMPAT_LINUX_THREADS
int
linux_clone(struct proc *p, struct linux_clone_args *args)
{
    printf("linux_clone(%d): Not enabled\n", p->p_pid);
    return (EOPNOTSUPP);
}

#else
#define CLONE_VM	0x100
#define CLONE_FS	0x200
#define CLONE_FILES	0x400
#define CLONE_SIGHAND	0x800
#define CLONE_PID	0x1000

int
linux_clone(struct proc *p, struct linux_clone_args *args)
{
    int error, ff = RFPROC;
    struct proc *p2;
    int            exit_signal;
    vm_offset_t    start;
    struct rfork_args rf_args;

#ifdef SMP
    printf("linux_clone(%d): does not work with SMP yet\n", p->p_pid);
    return (EOPNOTSUPP);
#endif
#ifdef DEBUG
    if (args->flags & CLONE_PID)
	printf("linux_clone(%d): CLONE_PID not yet supported\n", p->p_pid);
    printf ("linux_clone(%d): invoked with flags %x and stack %x\n", p->p_pid,
	     (unsigned int)args->flags, (unsigned int)args->stack);
#endif

    if (!args->stack)
        return (EINVAL);
    exit_signal = args->flags & 0x000000ff;
    if (exit_signal >= LINUX_NSIG)
	return EINVAL;
    exit_signal = linux_to_bsd_signal[exit_signal];

    /* RFTHREAD probably not necessary here, but it shouldn't hurt either */
    ff |= RFTHREAD;

    if (args->flags & CLONE_VM)
	ff |= RFMEM;
    if (args->flags & CLONE_SIGHAND)
	ff |= RFSIGSHARE;
    if (!(args->flags & CLONE_FILES))
	ff |= RFFDG;

    error = 0;
    start = 0;

    rf_args.flags = ff;
    if (error = rfork(p, &rf_args))
	return error;

    p2 = pfind(p->p_retval[0]);
    if (p2 == 0)
 	return ESRCH;

    p2->p_sigparent = exit_signal;
    p2->p_md.md_regs->tf_esp = (unsigned int)args->stack;

#ifdef DEBUG
    printf ("linux_clone(%d): successful rfork to %d\n", p->p_pid, p2->p_pid);
#endif
    return 0;
}

#endif /* COMPAT_LINUX_THREADS */
/* XXX move */
struct linux_mmap_argv {
	linux_caddr_t addr;
	int len;
	int prot;
	int flags;
	int fd;
	int pos;
};

#ifdef COMPAT_LINUX_THREADS
#define STACK_SIZE  (2 * 1024 * 1024)
#define GUARD_SIZE  (4 * PAGE_SIZE)

#endif /* COMPAT_LINUX_THREADS */
int
linux_mmap(struct proc *p, struct linux_mmap_args *args)
{
    struct mmap_args /* {
	caddr_t addr;
	size_t len;
	int prot;
	int flags;
	int fd;
	long pad;
	off_t pos;
    } */ bsd_args;
    int error;
    struct linux_mmap_argv linux_args;

    if ((error = copyin((caddr_t)args->ptr, (caddr_t)&linux_args,
			sizeof(linux_args))))
	return error;
#ifdef DEBUG
    printf("Linux-emul(%ld): mmap(%p, %d, %d, %08x, %d, %d)\n",
	(long)p->p_pid, (void *)linux_args.addr, linux_args.len,
	linux_args.prot, linux_args.flags, linux_args.fd, linux_args.pos);
#endif
    bsd_args.flags = 0;
    if (linux_args.flags & LINUX_MAP_SHARED)
	bsd_args.flags |= MAP_SHARED;
    if (linux_args.flags & LINUX_MAP_PRIVATE)
	bsd_args.flags |= MAP_PRIVATE;
    if (linux_args.flags & LINUX_MAP_FIXED)
	bsd_args.flags |= MAP_FIXED;
    if (linux_args.flags & LINUX_MAP_ANON)
	bsd_args.flags |= MAP_ANON;
#ifndef COMPAT_LINUX_THREADS
    bsd_args.addr = linux_args.addr;
    bsd_args.len = linux_args.len;
#else

    /*#if !defined(USE_VM_STACK) && !defined(USE_VM_STACK_FOR_EXEC)*/
    /* Linux Threads will map into the proc stack space, unless
       we prevent it.  This causes problems if we're not using
       our VM_STACK options.
    */
    if ((unsigned int)linux_args.addr + linux_args.len > (USRSTACK - MAXSSIZ))
        return (EINVAL);
    /*#endif*/

    if (linux_args.flags & LINUX_MAP_GROWSDOWN) {

#ifdef USE_VM_STACK
        /* USE_VM_STACK is defined (or not) in vm/vm_map.h */
        bsd_args.flags |= MAP_STACK;
#endif

	/* The linux MAP_GROWSDOWN option does not limit auto
	   growth of the region.  Linux mmap with this option
	   takes as addr the inital BOS, and as len, the initial
	   region size.  It can then grow down from addr without
	   limit.  However, linux threads has an implicit internal
	   limit to stack size of STACK_SIZE.  Its just not
	   enforced explicitly in linux.  But, here we impose
	   a limit of (STACK_SIZE - GUARD_SIZE) on the stack
	   region, since we can do this with our mmap.

	   Our mmap with MAP_STACK takes addr as the maximum
	   downsize limit on BOS, and as len the max size of
	   the region.  It them maps the top SGROWSIZ bytes,
	   and autgrows the region down, up to the limit
	   in addr.

	   If we don't use the MAP_STACK option, the effect
	   of this code is to allocate a stack region of a
	   fixed size of (STACK_SIZE - GUARD_SIZE).
	*/

	/* This gives us TOS */
        bsd_args.addr = linux_args.addr + linux_args.len;

	/* This gives us our maximum stack size */
	if (linux_args.len > STACK_SIZE - GUARD_SIZE)
	    bsd_args.len = linux_args.len;
	else
	    bsd_args.len  = STACK_SIZE - GUARD_SIZE;

	/* This gives us a new BOS.  If we're using VM_STACK, then
	   mmap will just map the top SGROWSIZ bytes, and let
	   the stack grow down to the limit at BOS.  If we're
	   not using VM_STACK we map the full stack, since we
	   don't have a way to autogrow it.
	*/
	bsd_args.addr -= bsd_args.len;

    } else {
        bsd_args.addr = linux_args.addr;
	bsd_args.len  = linux_args.len;
    }
#endif /* COMPAT_LINUX_THREADS */
    bsd_args.prot = linux_args.prot | PROT_READ;	/* always required */
    bsd_args.fd = linux_args.fd;
    bsd_args.pos = linux_args.pos;
    bsd_args.pad = 0;
    return mmap(p, &bsd_args);
}

int
linux_mremap(struct proc *p, struct linux_mremap_args *args)
{
	struct munmap_args /* {
		void *addr;
		size_t len;
	} */ bsd_args;
	int error = 0;

#ifdef DEBUG
	printf("Linux-emul(%ld): mremap(%p, %08x, %08x, %08x)\n",
	    (long)p->p_pid, (void *)args->addr, args->old_len, args->new_len,
	    args->flags);
#endif
	args->new_len = round_page(args->new_len);
	args->old_len = round_page(args->old_len);

	if (args->new_len > args->old_len) {
		p->p_retval[0] = 0;
		return ENOMEM;
	}

	if (args->new_len < args->old_len) {
		bsd_args.addr = args->addr + args->new_len;
		bsd_args.len = args->old_len - args->new_len;
		error = munmap(p, &bsd_args);
	}

	p->p_retval[0] = error ? 0 : (int)args->addr;
	return error;
}

int
linux_msync(struct proc *p, struct linux_msync_args *args)
{
	struct msync_args bsd_args;

	bsd_args.addr = args->addr;
	bsd_args.len = args->len;
	bsd_args.flags = 0;	/* XXX ignore */

	return msync(p, &bsd_args);
}

int
linux_pipe(struct proc *p, struct linux_pipe_args *args)
{
    int error;
    int reg_edx;

#ifdef DEBUG
    printf("Linux-emul(%d): pipe(*)\n", p->p_pid);
#endif
    reg_edx = p->p_retval[1];
    if (error = pipe(p, 0)) {
	p->p_retval[1] = reg_edx;
	return error;
    }

    if (error = copyout(p->p_retval, args->pipefds, 2*sizeof(int))) {
	p->p_retval[1] = reg_edx;
	return error;
    }

    p->p_retval[1] = reg_edx;
    p->p_retval[0] = 0;
    return 0;
}

int
linux_time(struct proc *p, struct linux_time_args *args)
{
    struct timeval tv;
    linux_time_t tm;
    int error;

#ifdef DEBUG
    printf("Linux-emul(%d): time(*)\n", p->p_pid);
#endif
    microtime(&tv);
    tm = tv.tv_sec;
    if (args->tm && (error = copyout(&tm, args->tm, sizeof(linux_time_t))))
	return error;
    p->p_retval[0] = tm;
    return 0;
}

struct linux_times_argv {
    long    tms_utime;
    long    tms_stime;
    long    tms_cutime;
    long    tms_cstime;
};

#define CLK_TCK 100	/* Linux uses 100 */
#define CONVTCK(r)	(r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))

int
linux_times(struct proc *p, struct linux_times_args *args)
{
    struct timeval tv;
    struct linux_times_argv tms;
    struct rusage ru;
    int error;

#ifdef DEBUG
    printf("Linux-emul(%d): times(*)\n", p->p_pid);
#endif
    calcru(p, &ru.ru_utime, &ru.ru_stime, NULL);

    tms.tms_utime = CONVTCK(ru.ru_utime);
    tms.tms_stime = CONVTCK(ru.ru_stime);

    tms.tms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime);
    tms.tms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime);

    if ((error = copyout((caddr_t)&tms, (caddr_t)args->buf,
	    	    sizeof(struct linux_times_argv))))
	return error;

    microuptime(&tv);
    p->p_retval[0] = (int)CONVTCK(tv);
    return 0;
}

/* XXX move */
struct linux_newuname_t {
    char sysname[65];
    char nodename[65];
    char release[65];
    char version[65];
    char machine[65];
    char domainname[65];
};

int
linux_newuname(struct proc *p, struct linux_newuname_args *args)
{
    struct linux_newuname_t linux_newuname;

#ifdef DEBUG
    printf("Linux-emul(%d): newuname(*)\n", p->p_pid);
#endif
    bzero(&linux_newuname, sizeof(struct linux_newuname_t));
    strncpy(linux_newuname.sysname, ostype,
	sizeof(linux_newuname.sysname) - 1);
    strncpy(linux_newuname.nodename, hostname,
	sizeof(linux_newuname.nodename) - 1);
    strncpy(linux_newuname.release, osrelease,
	sizeof(linux_newuname.release) - 1);
    strncpy(linux_newuname.version, version,
	sizeof(linux_newuname.version) - 1);
    strncpy(linux_newuname.machine, machine,
	sizeof(linux_newuname.machine) - 1);
    strncpy(linux_newuname.domainname, domainname,
	sizeof(linux_newuname.domainname) - 1);
    return (copyout((caddr_t)&linux_newuname, (caddr_t)args->buf,
	    	    sizeof(struct linux_newuname_t)));
}

struct linux_utimbuf {
	linux_time_t l_actime;
	linux_time_t l_modtime;
};

int
linux_utime(struct proc *p, struct linux_utime_args *args)
{
    struct utimes_args /* {
	char	*path;
	struct	timeval *tptr;
    } */ bsdutimes;
    struct timeval tv[2], *tvp;
    struct linux_utimbuf lut;
    int error;
    caddr_t sg;

    sg = stackgap_init();
    CHECKALTEXIST(p, &sg, args->fname);

#ifdef DEBUG
    printf("Linux-emul(%d): utime(%s, *)\n", p->p_pid, args->fname);
#endif
    if (args->times) {
	if ((error = copyin(args->times, &lut, sizeof lut)))
	    return error;
	tv[0].tv_sec = lut.l_actime;
	tv[0].tv_usec = 0;
	tv[1].tv_sec = lut.l_modtime;
	tv[1].tv_usec = 0;
	/* so that utimes can copyin */
	tvp = (struct timeval *)stackgap_alloc(&sg, sizeof(tv));
	if ((error = copyout(tv, tvp, sizeof(tv))))
	    return error;
	bsdutimes.tptr = tvp;
    } else
	bsdutimes.tptr = NULL;

    bsdutimes.path = args->fname;
    return utimes(p, &bsdutimes);
}

int
linux_waitpid(struct proc *p, struct linux_waitpid_args *args)
{
    struct wait_args /* {
	int pid;
	int *status;
	int options;
	struct	rusage *rusage;
    } */ tmp;
    int error, tmpstat;

#ifdef DEBUG
    printf("Linux-emul(%ld): waitpid(%d, %p, %d)\n",
	(long)p->p_pid, args->pid, (void *)args->status, args->options);
#endif
    tmp.pid = args->pid;
    tmp.status = args->status;
#ifndef COMPAT_LINUX_THREADS
    tmp.options = args->options;
#else
    /* This filters out the linux option _WCLONE.  I don't
       think we need it, but I could be wrong.  If we need
       it, we need to fix wait4, since it will give us an
       error return of EINVAL if we pass in _WCLONE, and
       of course, it won't do anything with it.
    */
    tmp.options = (args->options & (WNOHANG | WUNTRACED));
#endif /* COMPAT_LINUX_THREADS */
    tmp.rusage = NULL;

    if (error = wait4(p, &tmp))
#ifndef COMPAT_LINUX_THREADS
	return error;
#else
  	return error;
#endif /* COMPAT_LINUX_THREADS */
    if (args->status) {
	if (error = copyin(args->status, &tmpstat, sizeof(int)))
	    return error;
	if (WIFSIGNALED(tmpstat))
	    tmpstat = (tmpstat & 0xffffff80) |
		      bsd_to_linux_signal[WTERMSIG(tmpstat)];
	else if (WIFSTOPPED(tmpstat))
	    tmpstat = (tmpstat & 0xffff00ff) |
		      (bsd_to_linux_signal[WSTOPSIG(tmpstat)]<<8);
	return copyout(&tmpstat, args->status, sizeof(int));
    } else
	return 0;
}

int
linux_wait4(struct proc *p, struct linux_wait4_args *args)
{
    struct wait_args /* {
	int pid;
	int *status;
	int options;
	struct	rusage *rusage;
    } */ tmp;
    int error, tmpstat;

#ifdef DEBUG
    printf("Linux-emul(%ld): wait4(%d, %p, %d, %p)\n",
	(long)p->p_pid, args->pid, (void *)args->status, args->options,
	(void *)args->rusage);
#endif
    tmp.pid = args->pid;
    tmp.status = args->status;
#ifndef COMPAT_LINUX_THREADS
    tmp.options = args->options;
#else
    /* This filters out the linux option _WCLONE.  I don't
       think we need it, but I could be wrong.  If we need
       it, we need to fix wait4, since it will give us an
       error return of EINVAL if we pass in _WCLONE, and
       of course, it won't do anything with it.
    */
    tmp.options = (args->options & (WNOHANG | WUNTRACED));
#endif /* COMPAT_LINUX_THREADS */
    tmp.rusage = args->rusage;

    if (error = wait4(p, &tmp))
	return error;

    p->p_siglist &= ~sigmask(SIGCHLD);

    if (args->status) {
	if (error = copyin(args->status, &tmpstat, sizeof(int)))
	    return error;
	if (WIFSIGNALED(tmpstat))
	    tmpstat = (tmpstat & 0xffffff80) |
		  bsd_to_linux_signal[WTERMSIG(tmpstat)];
	else if (WIFSTOPPED(tmpstat))
	    tmpstat = (tmpstat & 0xffff00ff) |
		  (bsd_to_linux_signal[WSTOPSIG(tmpstat)]<<8);
	return copyout(&tmpstat, args->status, sizeof(int));
    } else
	return 0;
}

int
linux_mknod(struct proc *p, struct linux_mknod_args *args)
{
	caddr_t sg;
	struct mknod_args bsd_mknod;
	struct mkfifo_args bsd_mkfifo;

	sg = stackgap_init();

	CHECKALTCREAT(p, &sg, args->path);

#ifdef DEBUG
	printf("Linux-emul(%d): mknod(%s, %d, %d)\n",
	   p->p_pid, args->path, args->mode, args->dev);
#endif

	if (args->mode & S_IFIFO) {
		bsd_mkfifo.path = args->path;
		bsd_mkfifo.mode = args->mode;
		return mkfifo(p, &bsd_mkfifo);
	} else {
		bsd_mknod.path = args->path;
		bsd_mknod.mode = args->mode;
		bsd_mknod.dev = args->dev;
		return mknod(p, &bsd_mknod);
	}
}

/*
 * UGH! This is just about the dumbest idea I've ever heard!!
 */
int
linux_personality(struct proc *p, struct linux_personality_args *args)
{
#ifdef DEBUG
	printf("Linux-emul(%d): personality(%d)\n",
	   p->p_pid, args->per);
#endif
	if (args->per != 0)
		return EINVAL;

	/* Yes Jim, it's still a Linux... */
	p->p_retval[0] = 0;
	return 0;
}

/*
 * Wrappers for get/setitimer for debugging..
 */
int
linux_setitimer(struct proc *p, struct linux_setitimer_args *args)
{
	struct setitimer_args bsa;
	struct itimerval foo;
	int error;

#ifdef DEBUG
	printf("Linux-emul(%ld): setitimer(%p, %p)\n",
	    (long)p->p_pid, (void *)args->itv, (void *)args->oitv);
#endif
	bsa.which = args->which;
	bsa.itv = args->itv;
	bsa.oitv = args->oitv;
	if (args->itv) {
	    if ((error = copyin((caddr_t)args->itv, (caddr_t)&foo,
			sizeof(foo))))
		return error;
#ifdef DEBUG
	    printf("setitimer: value: sec: %ld, usec: %ld\n",
		foo.it_value.tv_sec, foo.it_value.tv_usec);
	    printf("setitimer: interval: sec: %ld, usec: %ld\n",
		foo.it_interval.tv_sec, foo.it_interval.tv_usec);
#endif
	}
	return setitimer(p, &bsa);
}

int
linux_getitimer(struct proc *p, struct linux_getitimer_args *args)
{
	struct getitimer_args bsa;
#ifdef DEBUG
	printf("Linux-emul(%ld): getitimer(%p)\n",
	    (long)p->p_pid, (void *)args->itv);
#endif
	bsa.which = args->which;
	bsa.itv = args->itv;
	return getitimer(p, &bsa);
}

int
linux_iopl(struct proc *p, struct linux_iopl_args *args)
{
	int error;

	error = suser(p->p_ucred, &p->p_acflag);
	if (error != 0)
		return error;
	if (securelevel > 0)
		return EPERM;
	p->p_md.md_regs->tf_eflags |= PSL_IOPL;
	return 0;
}

int
linux_nice(struct proc *p, struct linux_nice_args *args)
{
	struct setpriority_args	bsd_args;

	bsd_args.which = PRIO_PROCESS;
	bsd_args.who = 0;	/* current process */
	bsd_args.prio = args->inc;
	return setpriority(p, &bsd_args);
}