178 lines
4.8 KiB
C
178 lines
4.8 KiB
C
/* $NetBSD: uvm_unix.c,v 1.34 2006/10/12 01:32:54 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1997 Charles D. Cranor and Washington University.
|
|
* Copyright (c) 1991, 1993 The Regents of the University of California.
|
|
* Copyright (c) 1988 University of Utah.
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* 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.
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Charles D. Cranor,
|
|
* Washington University, the University of California, Berkeley and
|
|
* its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*
|
|
* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
|
|
* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
|
|
* from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp
|
|
*/
|
|
|
|
/*
|
|
* uvm_unix.c: traditional sbrk/grow interface to vm.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.34 2006/10/12 01:32:54 christos Exp $");
|
|
|
|
#include "opt_pax.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <sys/mount.h>
|
|
#include <sys/sa.h>
|
|
#include <sys/syscallargs.h>
|
|
|
|
#ifdef PAX_MPROTECT
|
|
#include <sys/pax.h>
|
|
#endif /* PAX_MPROTECT */
|
|
|
|
#include <uvm/uvm.h>
|
|
|
|
/*
|
|
* sys_obreak: set break
|
|
*/
|
|
|
|
int
|
|
sys_obreak(struct lwp *l, void *v, register_t *retval __unused)
|
|
{
|
|
struct sys_obreak_args /* {
|
|
syscallarg(char *) nsize;
|
|
} */ *uap = v;
|
|
struct proc *p = l->l_proc;
|
|
struct vmspace *vm = p->p_vmspace;
|
|
vaddr_t new, old;
|
|
int error;
|
|
|
|
old = (vaddr_t)vm->vm_daddr;
|
|
new = round_page((vaddr_t)SCARG(uap, nsize));
|
|
if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old)
|
|
return (ENOMEM);
|
|
|
|
old = round_page(old + ptoa(vm->vm_dsize));
|
|
|
|
if (new == old)
|
|
return (0);
|
|
|
|
/*
|
|
* grow or shrink?
|
|
*/
|
|
|
|
if (new > old) {
|
|
vm_prot_t prot = UVM_PROT_READ | UVM_PROT_WRITE;
|
|
vm_prot_t maxprot = UVM_PROT_ALL;
|
|
|
|
#ifdef PAX_MPROTECT
|
|
pax_mprotect(l, &prot, &maxprot);
|
|
#endif /* PAX_MPROTECT */
|
|
|
|
error = uvm_map(&vm->vm_map, &old, new - old, NULL,
|
|
UVM_UNKNOWN_OFFSET, 0,
|
|
UVM_MAPFLAG(prot, maxprot,
|
|
UVM_INH_COPY,
|
|
UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED|
|
|
UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW));
|
|
if (error) {
|
|
uprintf("sbrk: grow %ld failed, error = %d\n",
|
|
new - old, error);
|
|
return (error);
|
|
}
|
|
vm->vm_dsize += atop(new - old);
|
|
} else {
|
|
uvm_deallocate(&vm->vm_map, new, old - new);
|
|
vm->vm_dsize -= atop(old - new);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* uvm_grow: enlarge the "stack segment" to include sp.
|
|
*/
|
|
|
|
int
|
|
uvm_grow(struct proc *p, vaddr_t sp)
|
|
{
|
|
struct vmspace *vm = p->p_vmspace;
|
|
vsize_t nss;
|
|
|
|
/*
|
|
* For user defined stacks (from sendsig).
|
|
*/
|
|
if (sp < (vaddr_t)vm->vm_maxsaddr)
|
|
return (0);
|
|
|
|
/*
|
|
* For common case of already allocated (from trap).
|
|
*/
|
|
if (sp >= USRSTACK - ctob(vm->vm_ssize))
|
|
return (1);
|
|
|
|
/*
|
|
* Really need to check vs limit and increment stack size if ok.
|
|
*/
|
|
nss = btoc(USRSTACK - sp);
|
|
if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
|
|
return (0);
|
|
vm->vm_ssize = nss;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* sys_oadvise: old advice system call
|
|
*/
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sys_ovadvise(struct lwp *l __unused, void *v __unused,
|
|
register_t *retval __unused)
|
|
{
|
|
#if 0
|
|
struct sys_ovadvise_args /* {
|
|
syscallarg(int) anom;
|
|
} */ *uap = v;
|
|
#endif
|
|
|
|
return (EINVAL);
|
|
}
|