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/* $OpenBSD: vm_unix.c,v 1.8 1997/11/06 05:59:39 csapuntz Exp $ */
/* $NetBSD: vm_unix.c,v 1.19 1996/02/10 00:08:14 christos Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1991, 1993
* The Regents of the University of California. 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 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 8.2 (Berkeley) 1/9/95
*/
/*
* Traditional sbrk/grow interface to VM
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/vnode.h>
#include <sys/core.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <vm/vm.h>
/* ARGSUSED */
int
sys_obreak(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_obreak_args /* {
syscallarg(char *) nsize;
} */ *uap = v;
register struct vmspace *vm = p->p_vmspace;
vm_offset_t new, old;
int rv;
register int diff;
old = (vm_offset_t)vm->vm_daddr;
new = (vm_offset_t)SCARG(uap, nsize);
/* Check for overflow, round to page */
if(round_page(new) < new)
return(ENOMEM);
new = round_page(new);
/* Check limit */
if ((new > old) && ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur))
return(ENOMEM);
/* Turn the trick */
old = round_page(old + ctob(vm->vm_dsize));
diff = new - old;
if (diff > 0) {
rv = vm_allocate(&vm->vm_map, &old, diff, FALSE);
if (rv != KERN_SUCCESS) {
uprintf("sbrk: grow failed, return = %d\n", rv);
return(ENOMEM);
}
vm->vm_dsize += btoc(diff);
} else if (diff < 0) {
diff = -diff;
rv = vm_deallocate(&vm->vm_map, new, diff);
if (rv != KERN_SUCCESS) {
uprintf("sbrk: shrink failed, return = %d\n", rv);
return(ENOMEM);
}
vm->vm_dsize -= btoc(diff);
}
return(0);
}
/*
* Enlarge the "stack segment" to include the specified
* stack pointer for the process.
*/
int
grow(p, sp)
struct proc *p;
vm_offset_t sp;
{
register struct vmspace *vm = p->p_vmspace;
register int si;
/*
* For user defined stacks (from sendsig).
*/
if (sp < (vm_offset_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.
*/
si = clrnd(btoc(USRSTACK-sp) - vm->vm_ssize);
if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
return (0);
vm->vm_ssize += si;
return (1);
}
/* ARGSUSED */
int
sys_ovadvise(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
#if 0
struct sys_ovadvise_args /* {
syscallarg(int) anom;
} */ *uap = v;
#endif
return (EINVAL);
}
int
vm_coredump(p, vp, cred, chdr)
struct proc *p;
struct vnode *vp;
struct ucred *cred;
struct core *chdr;
{
register struct vmspace *vm = p->p_vmspace;
register vm_map_t map = &vm->vm_map;
register vm_map_entry_t entry;
vm_offset_t start, end;
struct coreseg cseg;
off_t offset;
int flag, error = 0;
if (!map->is_main_map) {
#ifdef DEBUG
uprintf(
"vm_coredump: %s map %p: pmap=%p, ref=%d, nentries=%d, version=%d\n",
(map->is_main_map ? "Task" : "Share"),
map, (map->pmap), map->ref_count, map->nentries,
map->timestamp);
#endif
return EIO;
}
offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize;
for (entry = map->header.next; entry != &map->header;
entry = entry->next) {
if (entry->is_a_map || entry->is_sub_map) {
#ifdef DEBUG
uprintf("vm_coredump: entry: share=%p, offset=%p\n",
entry->object.share_map, entry->offset);
#endif
continue;
}
if (entry->object.vm_object &&
entry->object.vm_object->pager &&
entry->object.vm_object->pager->pg_type == PG_DEVICE) {
#ifdef DEBUG
printf("vm_coredump: skipping dev @ 0x%lx\n",
entry->start);
#endif
continue;
}
if (!(entry->protection & VM_PROT_WRITE))
continue;
start = entry->start;
end = entry->end;
if (start >= VM_MAXUSER_ADDRESS)
continue;
if (end > VM_MAXUSER_ADDRESS)
end = VM_MAXUSER_ADDRESS;
if (start >= (vm_offset_t)vm->vm_maxsaddr) {
flag = CORE_STACK;
start = trunc_page(USRSTACK - ctob(vm->vm_ssize));
if (start >= end)
continue;
} else
flag = CORE_DATA;
/*
* Set up a new core file segment.
*/
CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag);
cseg.c_addr = start;
cseg.c_size = end - start;
error = vn_rdwr(UIO_WRITE, vp,
(caddr_t)&cseg, chdr->c_seghdrsize,
offset, UIO_SYSSPACE,
IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
if (error)
break;
offset += chdr->c_seghdrsize;
error = vn_rdwr(UIO_WRITE, vp,
(caddr_t)cseg.c_addr, (int)cseg.c_size,
offset, UIO_USERSPACE,
IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
if (error)
break;
offset += cseg.c_size;
chdr->c_nseg++;
}
return error;
}
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