uvm_unix.c revision 1.18.2.2
1 /* $NetBSD: uvm_unix.c,v 1.18.2.2 2001/04/09 01:59:24 nathanw 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/lwp.h> 56 #include <sys/proc.h> 57 #include <sys/resourcevar.h> 58 #include <sys/vnode.h> 59 #include <sys/core.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(l, v, retval) 72 struct lwp *l; 73 void *v; 74 register_t *retval; 75 { 76 struct sys_obreak_args /* { 77 syscallarg(char *) nsize; 78 } */ *uap = v; 79 struct proc *p = l->l_proc; 80 struct vmspace *vm = p->p_vmspace; 81 vaddr_t new, old; 82 ssize_t diff; 83 int error; 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 error = uvm_map(&vm->vm_map, &old, diff, NULL, 101 UVM_UNKNOWN_OFFSET, 0, 102 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 103 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 104 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 105 if (error) { 106 uprintf("sbrk: grow %ld failed, error = %d\n", 107 (long)diff, error); 108 return error; 109 } 110 vm->vm_dsize += atop(diff); 111 } else { 112 uvm_deallocate(&vm->vm_map, new, -diff); 113 vm->vm_dsize -= atop(-diff); 114 } 115 return 0; 116 } 117 118 /* 119 * uvm_grow: enlarge the "stack segment" to include sp. 120 */ 121 122 int 123 uvm_grow(p, sp) 124 struct proc *p; 125 vaddr_t sp; 126 { 127 struct vmspace *vm = p->p_vmspace; 128 int si; 129 130 /* 131 * For user defined stacks (from sendsig). 132 */ 133 if (sp < (vaddr_t)vm->vm_maxsaddr) 134 return (0); 135 136 /* 137 * For common case of already allocated (from trap). 138 */ 139 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 140 return (1); 141 142 /* 143 * Really need to check vs limit and increment stack size if ok. 144 */ 145 si = btoc(USRSTACK-sp) - vm->vm_ssize; 146 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 147 return (0); 148 vm->vm_ssize += si; 149 return (1); 150 } 151 152 /* 153 * sys_oadvise: old advice system call 154 */ 155 156 /* ARGSUSED */ 157 int 158 sys_ovadvise(l, v, retval) 159 struct lwp *l; 160 void *v; 161 register_t *retval; 162 { 163 #if 0 164 struct sys_ovadvise_args /* { 165 syscallarg(int) anom; 166 } */ *uap = v; 167 #endif 168 169 return (EINVAL); 170 } 171 172 /* 173 * uvm_coredump: dump core! 174 */ 175 176 int 177 uvm_coredump(p, vp, cred, chdr) 178 struct proc *p; 179 struct vnode *vp; 180 struct ucred *cred; 181 struct core *chdr; 182 { 183 struct vmspace *vm = p->p_vmspace; 184 vm_map_t map = &vm->vm_map; 185 vm_map_entry_t entry; 186 vaddr_t start, end, maxstack; 187 struct coreseg cseg; 188 off_t offset; 189 int flag, error = 0; 190 191 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 192 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 193 194 for (entry = map->header.next; entry != &map->header; 195 entry = entry->next) { 196 197 /* should never happen for a user process */ 198 if (UVM_ET_ISSUBMAP(entry)) { 199 panic("uvm_coredump: user process with submap?"); 200 } 201 202 if (!(entry->protection & VM_PROT_WRITE)) 203 continue; 204 205 start = entry->start; 206 end = entry->end; 207 208 if (start >= VM_MAXUSER_ADDRESS) 209 continue; 210 211 if (end > VM_MAXUSER_ADDRESS) 212 end = VM_MAXUSER_ADDRESS; 213 214 if (start >= (vaddr_t)vm->vm_maxsaddr) { 215 if (end <= maxstack) 216 continue; 217 if (start < maxstack) 218 start = maxstack; 219 flag = CORE_STACK; 220 } else 221 flag = CORE_DATA; 222 223 /* 224 * Set up a new core file segment. 225 */ 226 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 227 cseg.c_addr = start; 228 cseg.c_size = end - start; 229 230 error = vn_rdwr(UIO_WRITE, vp, 231 (caddr_t)&cseg, chdr->c_seghdrsize, 232 offset, UIO_SYSSPACE, 233 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 234 if (error) 235 break; 236 237 offset += chdr->c_seghdrsize; 238 error = vn_rdwr(UIO_WRITE, vp, 239 (caddr_t)cseg.c_addr, (int)cseg.c_size, 240 offset, UIO_USERSPACE, 241 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 242 if (error) 243 break; 244 245 offset += cseg.c_size; 246 chdr->c_nseg++; 247 } 248 249 return (error); 250 } 251 252 #if COMPAT_NETBSD32 253 /* 254 * uvm_coredump32: dump 32-bit core! 255 */ 256 257 int 258 uvm_coredump32(p, vp, cred, chdr) 259 struct proc *p; 260 struct vnode *vp; 261 struct ucred *cred; 262 struct core32 *chdr; 263 { 264 struct vmspace *vm = p->p_vmspace; 265 vm_map_t map = &vm->vm_map; 266 vm_map_entry_t entry; 267 vaddr_t start, end, maxstack; 268 struct coreseg32 cseg; 269 off_t offset; 270 int flag, error = 0; 271 272 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 273 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 274 275 for (entry = map->header.next; entry != &map->header; 276 entry = entry->next) { 277 278 /* should never happen for a user process */ 279 if (UVM_ET_ISSUBMAP(entry)) { 280 panic("uvm_coredump: user process with submap?"); 281 } 282 283 if (!(entry->protection & VM_PROT_WRITE)) 284 continue; 285 286 start = entry->start; 287 end = entry->end; 288 289 if (start >= VM_MAXUSER_ADDRESS) 290 continue; 291 292 if (end > VM_MAXUSER_ADDRESS) 293 end = VM_MAXUSER_ADDRESS; 294 295 if (start >= (vaddr_t)vm->vm_maxsaddr) { 296 if (end <= maxstack) 297 continue; 298 if (start < maxstack) 299 start = maxstack; 300 flag = CORE_STACK; 301 } else 302 flag = CORE_DATA; 303 304 /* 305 * Set up a new core file segment. 306 */ 307 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 308 cseg.c_addr = start; 309 cseg.c_size = end - start; 310 311 error = vn_rdwr(UIO_WRITE, vp, 312 (caddr_t)&cseg, chdr->c_seghdrsize, 313 offset, UIO_SYSSPACE, 314 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 315 if (error) 316 break; 317 318 offset += chdr->c_seghdrsize; 319 error = vn_rdwr(UIO_WRITE, vp, 320 (caddr_t)(u_long)cseg.c_addr, (int)cseg.c_size, 321 offset, UIO_USERSPACE, 322 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 323 if (error) 324 break; 325 326 offset += cseg.c_size; 327 chdr->c_nseg++; 328 } 329 330 return (error); 331 } 332 333 #endif 334
Indexes created Mon Sep 29 21:09:56 GMT 2025