/* $NetBSD: uvm_unix.c,v 1.26 2001/12/08 00:35:34 thorpej 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 __KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.26 2001/12/08 00:35:34 thorpej Exp $"); #include #include #include #include #include #include #include #include /* * sys_obreak: set break */ int sys_obreak(p, v, retval) struct proc *p; void *v; register_t *retval; { struct sys_obreak_args /* { syscallarg(char *) nsize; } */ *uap = v; 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) { error = uvm_map(&vm->vm_map, &old, new - old, NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, 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(p, sp) struct proc *p; vaddr_t sp; { struct vmspace *vm = p->p_vmspace; int si; /* * 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. */ si = 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); } /* * sys_oadvise: old advice system call */ /* 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); }