uvm_unix.c revision 1.12.4.2
1 /* $NetBSD: uvm_unix.c,v 1.12.4.2 2000/09/07 07:04:42 chs 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 #include "opt_compat_netbsd32.h" 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/proc.h> 56 #include <sys/resourcevar.h> 57 #include <sys/vnode.h> 58 #include <sys/core.h> 59 60 #include <sys/mount.h> 61 #include <sys/syscallargs.h> 62 63 #include <vm/vm.h> 64 #include <uvm/uvm.h> 65 66 67 /* 68 * sys_obreak: set break 69 */ 70 71 int 72 sys_obreak(p, v, retval) 73 struct proc *p; 74 void *v; 75 register_t *retval; 76 { 77 struct sys_obreak_args /* { 78 syscallarg(char *) nsize; 79 } */ *uap = v; 80 struct vmspace *vm = p->p_vmspace; 81 vaddr_t new, old; 82 ssize_t diff; 83 int rv; 84 85 old = (vaddr_t)vm->vm_daddr; 86 new = round_page((vaddr_t)SCARG(uap, nsize)); 87 if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) 88 return (ENOMEM); 89 90 old = round_page(old + ptoa(vm->vm_dsize)); 91 diff = new - old; 92 93 if (diff == 0) 94 return (0); 95 96 /* 97 * grow or shrink? 98 */ 99 if (diff > 0) { 100 rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET, 101 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 102 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 103 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 104 if (rv == KERN_SUCCESS) { 105 vm->vm_dsize += atop(diff); 106 return (0); 107 } 108 } else { 109 rv = uvm_deallocate(&vm->vm_map, new, -diff); 110 if (rv == KERN_SUCCESS) { 111 vm->vm_dsize -= atop(-diff); 112 return (0); 113 } 114 } 115 116 uprintf("sbrk: %s %ld failed, return = %d\n", 117 diff > 0 ? "grow" : "shrink", 118 (long)(diff > 0 ? diff : -diff), rv); 119 return (ENOMEM); 120 } 121 122 /* 123 * uvm_grow: enlarge the "stack segment" to include sp. 124 */ 125 126 int 127 uvm_grow(p, sp) 128 struct proc *p; 129 vaddr_t sp; 130 { 131 struct vmspace *vm = p->p_vmspace; 132 int si; 133 134 /* 135 * For user defined stacks (from sendsig). 136 */ 137 if (sp < (vaddr_t)vm->vm_maxsaddr) 138 return (0); 139 140 /* 141 * For common case of already allocated (from trap). 142 */ 143 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 144 return (1); 145 146 /* 147 * Really need to check vs limit and increment stack size if ok. 148 */ 149 si = btoc(USRSTACK-sp) - vm->vm_ssize; 150 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 151 return (0); 152 vm->vm_ssize += si; 153 return (1); 154 } 155 156 /* 157 * sys_oadvise: old advice system call 158 */ 159 160 /* ARGSUSED */ 161 int 162 sys_ovadvise(p, v, retval) 163 struct proc *p; 164 void *v; 165 register_t *retval; 166 { 167 #if 0 168 struct sys_ovadvise_args /* { 169 syscallarg(int) anom; 170 } */ *uap = v; 171 #endif 172 173 return (EINVAL); 174 } 175 176 /* 177 * uvm_coredump: dump core! 178 */ 179 180 int 181 uvm_coredump(p, vp, cred, chdr) 182 struct proc *p; 183 struct vnode *vp; 184 struct ucred *cred; 185 struct core *chdr; 186 { 187 struct vmspace *vm = p->p_vmspace; 188 vm_map_t map = &vm->vm_map; 189 vm_map_entry_t entry; 190 vaddr_t start, end, maxstack; 191 struct coreseg cseg; 192 off_t offset; 193 int flag, error = 0; 194 195 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 196 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 197 198 for (entry = map->header.next; entry != &map->header; 199 entry = entry->next) { 200 201 /* should never happen for a user process */ 202 if (UVM_ET_ISSUBMAP(entry)) { 203 panic("uvm_coredump: user process with submap?"); 204 } 205 206 if (!(entry->protection & VM_PROT_WRITE)) 207 continue; 208 209 start = entry->start; 210 end = entry->end; 211 212 if (start >= VM_MAXUSER_ADDRESS) 213 continue; 214 215 if (end > VM_MAXUSER_ADDRESS) 216 end = VM_MAXUSER_ADDRESS; 217 218 if (start >= (vaddr_t)vm->vm_maxsaddr) { 219 if (end <= maxstack) 220 continue; 221 if (start < maxstack) 222 start = maxstack; 223 flag = CORE_STACK; 224 } else 225 flag = CORE_DATA; 226 227 /* 228 * Set up a new core file segment. 229 */ 230 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 231 cseg.c_addr = start; 232 cseg.c_size = end - start; 233 234 error = vn_rdwr(UIO_WRITE, vp, 235 (caddr_t)&cseg, chdr->c_seghdrsize, 236 offset, UIO_SYSSPACE, 237 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 238 if (error) 239 break; 240 241 offset += chdr->c_seghdrsize; 242 error = vn_rdwr(UIO_WRITE, vp, 243 (caddr_t)cseg.c_addr, (int)cseg.c_size, 244 offset, UIO_USERSPACE, 245 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 246 if (error) 247 break; 248 249 offset += cseg.c_size; 250 chdr->c_nseg++; 251 } 252 253 return (error); 254 } 255 256 #if COMPAT_NETBSD32 257 /* 258 * uvm_coredump32: dump 32-bit core! 259 */ 260 261 int 262 uvm_coredump32(p, vp, cred, chdr) 263 struct proc *p; 264 struct vnode *vp; 265 struct ucred *cred; 266 struct core32 *chdr; 267 { 268 struct vmspace *vm = p->p_vmspace; 269 vm_map_t map = &vm->vm_map; 270 vm_map_entry_t entry; 271 vaddr_t start, end, maxstack; 272 struct coreseg32 cseg; 273 off_t offset; 274 int flag, error = 0; 275 276 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 277 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 278 279 for (entry = map->header.next; entry != &map->header; 280 entry = entry->next) { 281 282 /* should never happen for a user process */ 283 if (UVM_ET_ISSUBMAP(entry)) { 284 panic("uvm_coredump: user process with submap?"); 285 } 286 287 if (!(entry->protection & VM_PROT_WRITE)) 288 continue; 289 290 start = entry->start; 291 end = entry->end; 292 293 if (start >= VM_MAXUSER_ADDRESS) 294 continue; 295 296 if (end > VM_MAXUSER_ADDRESS) 297 end = VM_MAXUSER_ADDRESS; 298 299 if (start >= (vaddr_t)vm->vm_maxsaddr) { 300 if (end <= maxstack) 301 continue; 302 if (start < maxstack) 303 start = maxstack; 304 flag = CORE_STACK; 305 } else 306 flag = CORE_DATA; 307 308 /* 309 * Set up a new core file segment. 310 */ 311 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 312 cseg.c_addr = start; 313 cseg.c_size = end - start; 314 315 error = vn_rdwr(UIO_WRITE, vp, 316 (caddr_t)&cseg, chdr->c_seghdrsize, 317 offset, UIO_SYSSPACE, 318 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 319 if (error) 320 break; 321 322 offset += chdr->c_seghdrsize; 323 error = vn_rdwr(UIO_WRITE, vp, 324 (caddr_t)cseg.c_addr, (int)cseg.c_size, 325 offset, UIO_USERSPACE, 326 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 327 if (error) 328 break; 329 330 offset += cseg.c_size; 331 chdr->c_nseg++; 332 } 333 334 return (error); 335 } 336 337 #endif 338
Indexes created Mon Sep 29 21:09:56 GMT 2025