248 lines
6.4 KiB
C
248 lines
6.4 KiB
C
/* $NetBSD: vm_unix.c,v 1.20 1997/07/22 10:06:43 drochner Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
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*
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* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
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*/
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/*
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* Traditional sbrk/grow interface to VM
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/vnode.h>
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#include <sys/core.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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#include <vm/vm.h>
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/* ARGSUSED */
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int
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sys_obreak(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_obreak_args /* {
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syscallarg(char *) nsize;
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} */ *uap = v;
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register struct vmspace *vm = p->p_vmspace;
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vm_offset_t new, old;
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int rv;
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register int diff;
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old = (vm_offset_t)vm->vm_daddr;
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new = round_page(SCARG(uap, nsize));
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if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
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return(ENOMEM);
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old = round_page(old + ctob(vm->vm_dsize));
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diff = new - old;
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if (diff > 0) {
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rv = vm_allocate(&vm->vm_map, &old, diff, FALSE);
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if (rv != KERN_SUCCESS) {
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uprintf("sbrk: grow failed, return = %d\n", rv);
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return(ENOMEM);
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}
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vm->vm_dsize += btoc(diff);
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} else if (diff < 0) {
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diff = -diff;
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rv = vm_deallocate(&vm->vm_map, new, diff);
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if (rv != KERN_SUCCESS) {
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uprintf("sbrk: shrink failed, return = %d\n", rv);
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return(ENOMEM);
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}
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vm->vm_dsize -= btoc(diff);
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}
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return(0);
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}
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/*
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* Enlarge the "stack segment" to include the specified
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* stack pointer for the process.
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*/
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int
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grow(p, sp)
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struct proc *p;
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vm_offset_t sp;
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{
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register struct vmspace *vm = p->p_vmspace;
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register int si;
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/*
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* For user defined stacks (from sendsig).
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*/
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if (sp < (vm_offset_t)vm->vm_maxsaddr)
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return (0);
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/*
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* For common case of already allocated (from trap).
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*/
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if (sp >= USRSTACK - ctob(vm->vm_ssize))
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return (1);
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/*
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* Really need to check vs limit and increment stack size if ok.
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*/
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si = clrnd(btoc(USRSTACK-sp) - vm->vm_ssize);
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if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
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return (0);
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vm->vm_ssize += si;
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return (1);
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}
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/* ARGSUSED */
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int
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sys_ovadvise(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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#if 0
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struct sys_ovadvise_args /* {
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syscallarg(int) anom;
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} */ *uap = v;
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#endif
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return (EINVAL);
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}
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int
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vm_coredump(p, vp, cred, chdr)
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struct proc *p;
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struct vnode *vp;
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struct ucred *cred;
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struct core *chdr;
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{
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register struct vmspace *vm = p->p_vmspace;
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register vm_map_t map = &vm->vm_map;
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register vm_map_entry_t entry;
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vm_offset_t start, end;
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struct coreseg cseg;
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off_t offset;
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int flag, error = 0;
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if (!map->is_main_map) {
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#ifdef DEBUG
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uprintf(
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"vm_coredump: %s map 0x%lx: pmap=0x%lx,ref=%d,nentries=%d,version=%d\n",
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(map->is_main_map ? "Task" : "Share"),
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(long)map, (long)(map->pmap),
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map->ref_count, map->nentries,
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map->timestamp);
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#endif
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return EIO;
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}
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offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize;
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for (entry = map->header.next; entry != &map->header;
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entry = entry->next) {
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if (entry->is_a_map || entry->is_sub_map) {
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#ifdef DEBUG
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uprintf(
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"vm_coredump: entry: share=0x%lx, offset=0x%lx\n",
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(long) entry->object.share_map,
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(long) entry->offset);
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#endif
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continue;
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}
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if (entry->object.vm_object &&
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entry->object.vm_object->pager &&
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entry->object.vm_object->pager->pg_type == PG_DEVICE) {
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#ifdef DEBUG
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printf("vm_coredump: skipping dev @ %lx\n",
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(u_long)entry->start);
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#endif
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continue;
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}
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if (!(entry->protection & VM_PROT_WRITE))
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continue;
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start = entry->start;
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end = entry->end;
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if (start >= VM_MAXUSER_ADDRESS)
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continue;
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if (end > VM_MAXUSER_ADDRESS)
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end = VM_MAXUSER_ADDRESS;
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if (start >= (vm_offset_t)vm->vm_maxsaddr) {
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flag = CORE_STACK;
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start = trunc_page(USRSTACK - ctob(vm->vm_ssize));
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if (start >= end)
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continue;
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} else
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flag = CORE_DATA;
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/*
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* Set up a new core file segment.
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*/
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CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag);
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cseg.c_addr = start;
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cseg.c_size = end - start;
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error = vn_rdwr(UIO_WRITE, vp,
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(caddr_t)&cseg, chdr->c_seghdrsize,
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offset, UIO_SYSSPACE,
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IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
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if (error)
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break;
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offset += chdr->c_seghdrsize;
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error = vn_rdwr(UIO_WRITE, vp,
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(caddr_t)cseg.c_addr, (int)cseg.c_size,
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offset, UIO_USERSPACE,
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IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
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if (error)
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break;
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offset += cseg.c_size;
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chdr->c_nseg++;
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}
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return error;
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}
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