uvm_unix.c revision 1.21
1 /* $NetBSD: uvm_unix.c,v 1.21 2001/05/06 04:32:09 ross 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 <uvm/uvm.h> 64 65 /* 66 * sys_obreak: set break 67 */ 68 69 int 70 sys_obreak(p, v, retval) 71 struct proc *p; 72 void *v; 73 register_t *retval; 74 { 75 struct sys_obreak_args /* { 76 syscallarg(char *) nsize; 77 } */ *uap = v; 78 struct vmspace *vm = p->p_vmspace; 79 vaddr_t new, old; 80 int error; 81 82 old = (vaddr_t)vm->vm_daddr; 83 new = round_page((vaddr_t)SCARG(uap, nsize)); 84 if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old) 85 return (ENOMEM); 86 87 old = round_page(old + ptoa(vm->vm_dsize)); 88 89 if (new == old) 90 return (0); 91 92 /* 93 * grow or shrink? 94 */ 95 if (new > old) { 96 error = uvm_map(&vm->vm_map, &old, new - old, NULL, 97 UVM_UNKNOWN_OFFSET, 0, 98 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 99 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 100 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 101 if (error) { 102 uprintf("sbrk: grow %ld failed, error = %d\n", 103 new - old, error); 104 return error; 105 } 106 vm->vm_dsize += atop(new - old); 107 } else { 108 uvm_deallocate(&vm->vm_map, new, old - new); 109 vm->vm_dsize -= atop(old - new); 110 } 111 return 0; 112 } 113 114 /* 115 * uvm_grow: enlarge the "stack segment" to include sp. 116 */ 117 118 int 119 uvm_grow(p, sp) 120 struct proc *p; 121 vaddr_t sp; 122 { 123 struct vmspace *vm = p->p_vmspace; 124 int si; 125 126 /* 127 * For user defined stacks (from sendsig). 128 */ 129 if (sp < (vaddr_t)vm->vm_maxsaddr) 130 return (0); 131 132 /* 133 * For common case of already allocated (from trap). 134 */ 135 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 136 return (1); 137 138 /* 139 * Really need to check vs limit and increment stack size if ok. 140 */ 141 si = btoc(USRSTACK-sp) - vm->vm_ssize; 142 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 143 return (0); 144 vm->vm_ssize += si; 145 return (1); 146 } 147 148 /* 149 * sys_oadvise: old advice system call 150 */ 151 152 /* ARGSUSED */ 153 int 154 sys_ovadvise(p, v, retval) 155 struct proc *p; 156 void *v; 157 register_t *retval; 158 { 159 #if 0 160 struct sys_ovadvise_args /* { 161 syscallarg(int) anom; 162 } */ *uap = v; 163 #endif 164 165 return (EINVAL); 166 } 167 168 /* 169 * uvm_coredump: dump core! 170 */ 171 172 int 173 uvm_coredump(p, vp, cred, chdr) 174 struct proc *p; 175 struct vnode *vp; 176 struct ucred *cred; 177 struct core *chdr; 178 { 179 struct vmspace *vm = p->p_vmspace; 180 vm_map_t map = &vm->vm_map; 181 vm_map_entry_t entry; 182 vaddr_t start, end, maxstack; 183 struct coreseg cseg; 184 off_t offset; 185 int flag, error = 0; 186 187 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 188 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 189 190 for (entry = map->header.next; entry != &map->header; 191 entry = entry->next) { 192 193 /* should never happen for a user process */ 194 if (UVM_ET_ISSUBMAP(entry)) { 195 panic("uvm_coredump: user process with submap?"); 196 } 197 198 if (!(entry->protection & VM_PROT_WRITE)) 199 continue; 200 201 start = entry->start; 202 end = entry->end; 203 204 if (start >= VM_MAXUSER_ADDRESS) 205 continue; 206 207 if (end > VM_MAXUSER_ADDRESS) 208 end = VM_MAXUSER_ADDRESS; 209 210 if (start >= (vaddr_t)vm->vm_maxsaddr) { 211 if (end <= maxstack) 212 continue; 213 if (start < maxstack) 214 start = maxstack; 215 flag = CORE_STACK; 216 } else 217 flag = CORE_DATA; 218 219 /* 220 * Set up a new core file segment. 221 */ 222 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 223 cseg.c_addr = start; 224 cseg.c_size = end - start; 225 226 error = vn_rdwr(UIO_WRITE, vp, 227 (caddr_t)&cseg, chdr->c_seghdrsize, 228 offset, UIO_SYSSPACE, 229 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 230 if (error) 231 break; 232 233 offset += chdr->c_seghdrsize; 234 error = vn_rdwr(UIO_WRITE, vp, 235 (caddr_t)cseg.c_addr, (int)cseg.c_size, 236 offset, UIO_USERSPACE, 237 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 238 if (error) 239 break; 240 241 offset += cseg.c_size; 242 chdr->c_nseg++; 243 } 244 245 return (error); 246 } 247 248 #if COMPAT_NETBSD32 249 /* 250 * uvm_coredump32: dump 32-bit core! 251 */ 252 253 int 254 uvm_coredump32(p, vp, cred, chdr) 255 struct proc *p; 256 struct vnode *vp; 257 struct ucred *cred; 258 struct core32 *chdr; 259 { 260 struct vmspace *vm = p->p_vmspace; 261 vm_map_t map = &vm->vm_map; 262 vm_map_entry_t entry; 263 vaddr_t start, end, maxstack; 264 struct coreseg32 cseg; 265 off_t offset; 266 int flag, error = 0; 267 268 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 269 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 270 271 for (entry = map->header.next; entry != &map->header; 272 entry = entry->next) { 273 274 /* should never happen for a user process */ 275 if (UVM_ET_ISSUBMAP(entry)) { 276 panic("uvm_coredump: user process with submap?"); 277 } 278 279 if (!(entry->protection & VM_PROT_WRITE)) 280 continue; 281 282 start = entry->start; 283 end = entry->end; 284 285 if (start >= VM_MAXUSER_ADDRESS) 286 continue; 287 288 if (end > VM_MAXUSER_ADDRESS) 289 end = VM_MAXUSER_ADDRESS; 290 291 if (start >= (vaddr_t)vm->vm_maxsaddr) { 292 if (end <= maxstack) 293 continue; 294 if (start < maxstack) 295 start = maxstack; 296 flag = CORE_STACK; 297 } else 298 flag = CORE_DATA; 299 300 /* 301 * Set up a new core file segment. 302 */ 303 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 304 cseg.c_addr = start; 305 cseg.c_size = end - start; 306 307 error = vn_rdwr(UIO_WRITE, vp, 308 (caddr_t)&cseg, chdr->c_seghdrsize, 309 offset, UIO_SYSSPACE, 310 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 311 if (error) 312 break; 313 314 offset += chdr->c_seghdrsize; 315 error = vn_rdwr(UIO_WRITE, vp, 316 (caddr_t)(u_long)cseg.c_addr, (int)cseg.c_size, 317 offset, UIO_USERSPACE, 318 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 319 if (error) 320 break; 321 322 offset += cseg.c_size; 323 chdr->c_nseg++; 324 } 325 326 return (error); 327 } 328 329 #endif 330
Indexes created Tue Sep 23 07:09:52 GMT 2025