1 /* $NetBSD: uvm_unix.c,v 1.26 2001/12/08 00:35:34 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Charles D. Cranor and Washington University. 5 * Copyright (c) 1991, 1993 The Regents of the University of California. 6 * Copyright (c) 1988 University of Utah. 7 * 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * the Systems Programming Group of the University of Utah Computer 12 * Science Department. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by Charles D. Cranor, 25 * Washington University, the University of California, Berkeley and 26 * its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 44 * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 45 * from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp 46 */ 47 48 /* 49 * uvm_unix.c: traditional sbrk/grow interface to vm. 50 */ 51 52 #include <sys/cdefs.h> 53 __KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.26 2001/12/08 00:35:34 thorpej Exp $"); 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/proc.h> 58 #include <sys/resourcevar.h> 59 #include <sys/vnode.h> 60 61 #include <sys/mount.h> 62 #include <sys/syscallargs.h> 63 64 #include <uvm/uvm.h> 65 66 /* 67 * sys_obreak: set break 68 */ 69 70 int 71 sys_obreak(p, v, retval) 72 struct proc *p; 73 void *v; 74 register_t *retval; 75 { 76 struct sys_obreak_args /* { 77 syscallarg(char *) nsize; 78 } */ *uap = v; 79 struct vmspace *vm = p->p_vmspace; 80 vaddr_t new, old; 81 int error; 82 83 old = (vaddr_t)vm->vm_daddr; 84 new = round_page((vaddr_t)SCARG(uap, nsize)); 85 if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old) 86 return (ENOMEM); 87 88 old = round_page(old + ptoa(vm->vm_dsize)); 89 90 if (new == old) 91 return (0); 92 93 /* 94 * grow or shrink? 95 */ 96 if (new > old) { 97 error = uvm_map(&vm->vm_map, &old, new - old, NULL, 98 UVM_UNKNOWN_OFFSET, 0, 99 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 100 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 101 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 102 if (error) { 103 uprintf("sbrk: grow %ld failed, error = %d\n", 104 new - old, error); 105 return error; 106 } 107 vm->vm_dsize += atop(new - old); 108 } else { 109 uvm_deallocate(&vm->vm_map, new, old - new); 110 vm->vm_dsize -= atop(old - new); 111 } 112 return 0; 113 } 114 115 /* 116 * uvm_grow: enlarge the "stack segment" to include sp. 117 */ 118 119 int 120 uvm_grow(p, sp) 121 struct proc *p; 122 vaddr_t sp; 123 { 124 struct vmspace *vm = p->p_vmspace; 125 int si; 126 127 /* 128 * For user defined stacks (from sendsig). 129 */ 130 if (sp < (vaddr_t)vm->vm_maxsaddr) 131 return (0); 132 133 /* 134 * For common case of already allocated (from trap). 135 */ 136 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 137 return (1); 138 139 /* 140 * Really need to check vs limit and increment stack size if ok. 141 */ 142 si = btoc(USRSTACK-sp) - vm->vm_ssize; 143 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 144 return (0); 145 vm->vm_ssize += si; 146 return (1); 147 } 148 149 /* 150 * sys_oadvise: old advice system call 151 */ 152 153 /* ARGSUSED */ 154 int 155 sys_ovadvise(p, v, retval) 156 struct proc *p; 157 void *v; 158 register_t *retval; 159 { 160 #if 0 161 struct sys_ovadvise_args /* { 162 syscallarg(int) anom; 163 } */ *uap = v; 164 #endif 165 166 return (EINVAL); 167 } 168