1 /* $OpenBSD: uvm_unix.c,v 1.2 1999/02/26 05:32:08 art Exp $ */ 2 /* $NetBSD: uvm_unix.c,v 1.7 1998/10/11 23:18:21 chuck Exp $ */ 3 4 /* 5 * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE! 6 * >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<< 7 */ 8 /* 9 * Copyright (c) 1997 Charles D. Cranor and Washington University. 10 * Copyright (c) 1991, 1993 The Regents of the University of California. 11 * Copyright (c) 1988 University of Utah. 12 * 13 * All rights reserved. 14 * 15 * This code is derived from software contributed to Berkeley by 16 * the Systems Programming Group of the University of Utah Computer 17 * Science Department. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 1. Redistributions of source code must retain the above copyright 23 * notice, this list of conditions and the following disclaimer. 24 * 2. Redistributions in binary form must reproduce the above copyright 25 * notice, this list of conditions and the following disclaimer in the 26 * documentation and/or other materials provided with the distribution. 27 * 3. All advertising materials mentioning features or use of this software 28 * must display the following acknowledgement: 29 * This product includes software developed by Charles D. Cranor, 30 * Washington University, the University of California, Berkeley and 31 * its contributors. 32 * 4. Neither the name of the University nor the names of its contributors 33 * may be used to endorse or promote products derived from this software 34 * without specific prior written permission. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 * 48 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 49 * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 50 * from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp 51 */ 52 53 /* 54 * uvm_unix.c: traditional sbrk/grow interface to vm. 55 */ 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/proc.h> 60 #include <sys/resourcevar.h> 61 #include <sys/vnode.h> 62 #include <sys/core.h> 63 64 #include <sys/mount.h> 65 #include <sys/syscallargs.h> 66 67 #include <vm/vm.h> 68 #include <uvm/uvm.h> 69 70 71 /* 72 * sys_obreak: set break 73 */ 74 75 int 76 sys_obreak(p, v, retval) 77 struct proc *p; 78 void *v; 79 register_t *retval; 80 { 81 struct sys_obreak_args /* { 82 syscallarg(char *) nsize; 83 } */ *uap = v; 84 register struct vmspace *vm = p->p_vmspace; 85 vaddr_t new, old; 86 int rv; 87 register int diff; 88 89 old = (vaddr_t)vm->vm_daddr; 90 new = round_page(SCARG(uap, nsize)); 91 if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) 92 return(ENOMEM); 93 94 old = round_page(old + ctob(vm->vm_dsize)); 95 diff = new - old; 96 97 /* 98 * grow or shrink? 99 */ 100 101 if (diff > 0) { 102 103 rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET, 104 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 105 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 106 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 107 108 if (rv != KERN_SUCCESS) { 109 uprintf("sbrk: grow failed, return = %d\n", rv); 110 return(ENOMEM); 111 } 112 vm->vm_dsize += btoc(diff); 113 114 } else if (diff < 0) { 115 116 diff = -diff; 117 rv = uvm_deallocate(&vm->vm_map, new, diff); 118 if (rv != KERN_SUCCESS) { 119 uprintf("sbrk: shrink failed, return = %d\n", rv); 120 return(ENOMEM); 121 } 122 vm->vm_dsize -= btoc(diff); 123 124 } 125 return(0); 126 } 127 128 /* 129 * uvm_grow: enlarge the "stack segment" to include sp. 130 */ 131 132 int 133 uvm_grow(p, sp) 134 struct proc *p; 135 vaddr_t sp; 136 { 137 register struct vmspace *vm = p->p_vmspace; 138 register int si; 139 140 /* 141 * For user defined stacks (from sendsig). 142 */ 143 if (sp < (vaddr_t)vm->vm_maxsaddr) 144 return (0); 145 146 /* 147 * For common case of already allocated (from trap). 148 */ 149 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 150 return (1); 151 152 /* 153 * Really need to check vs limit and increment stack size if ok. 154 */ 155 si = clrnd(btoc(USRSTACK-sp) - vm->vm_ssize); 156 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 157 return (0); 158 vm->vm_ssize += si; 159 return (1); 160 } 161 162 /* 163 * sys_oadvise: old advice system call 164 */ 165 166 /* ARGSUSED */ 167 int 168 sys_ovadvise(p, v, retval) 169 struct proc *p; 170 void *v; 171 register_t *retval; 172 { 173 #if 0 174 struct sys_ovadvise_args /* { 175 syscallarg(int) anom; 176 } */ *uap = v; 177 #endif 178 179 return (EINVAL); 180 } 181 182 /* 183 * uvm_coredump: dump core! 184 */ 185 186 int 187 uvm_coredump(p, vp, cred, chdr) 188 struct proc *p; 189 struct vnode *vp; 190 struct ucred *cred; 191 struct core *chdr; 192 { 193 register struct vmspace *vm = p->p_vmspace; 194 register vm_map_t map = &vm->vm_map; 195 register vm_map_entry_t entry; 196 vaddr_t start, end; 197 struct coreseg cseg; 198 off_t offset; 199 int flag, error = 0; 200 201 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 202 203 for (entry = map->header.next; entry != &map->header; 204 entry = entry->next) { 205 206 /* should never happen for a user process */ 207 if (UVM_ET_ISSUBMAP(entry)) { 208 panic("uvm_coredump: user process with submap?"); 209 } 210 211 if (!(entry->protection & VM_PROT_WRITE)) 212 continue; 213 214 start = entry->start; 215 end = entry->end; 216 217 if (start >= VM_MAXUSER_ADDRESS) 218 continue; 219 220 if (end > VM_MAXUSER_ADDRESS) 221 end = VM_MAXUSER_ADDRESS; 222 223 if (start >= (vaddr_t)vm->vm_maxsaddr) { 224 flag = CORE_STACK; 225 start = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 226 if (start >= end) 227 continue; 228 } else 229 flag = CORE_DATA; 230 231 /* 232 * Set up a new core file segment. 233 */ 234 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 235 cseg.c_addr = start; 236 cseg.c_size = end - start; 237 238 error = vn_rdwr(UIO_WRITE, vp, 239 (caddr_t)&cseg, chdr->c_seghdrsize, 240 offset, UIO_SYSSPACE, 241 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 242 if (error) 243 break; 244 245 offset += chdr->c_seghdrsize; 246 error = vn_rdwr(UIO_WRITE, vp, 247 (caddr_t)cseg.c_addr, (int)cseg.c_size, 248 offset, UIO_USERSPACE, 249 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 250 if (error) 251 break; 252 253 offset += cseg.c_size; 254 chdr->c_nseg++; 255 } 256 257 return (error); 258 } 259 260