/* $OpenBSD: vm_unix.c,v 1.7 1997/10/06 20:21:30 deraadt 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 8.1 (Berkeley) 6/11/93 */ /* * Traditional sbrk/grow interface to VM */ #include #include #include #include #include #include #include #include #include /* 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; }