uvm_unix.c revision 1.13
1 /* $NetBSD: uvm_unix.c,v 1.13 2000/06/27 17:29:36 mrg 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 rv; 81 int diff; 82 83 old = (vaddr_t)vm->vm_daddr; 84 new = round_page((vaddr_t)SCARG(uap, nsize)); 85 if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) 86 return(ENOMEM); 87 88 old = round_page(old + ctob(vm->vm_dsize)); 89 diff = new - old; 90 91 /* 92 * grow or shrink? 93 */ 94 95 if (diff > 0) { 96 97 rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET, 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)); 101 102 if (rv != KERN_SUCCESS) { 103 uprintf("sbrk: grow failed, return = %d\n", rv); 104 return(ENOMEM); 105 } 106 vm->vm_dsize += btoc(diff); 107 108 } else if (diff < 0) { 109 110 diff = -diff; 111 rv = uvm_deallocate(&vm->vm_map, new, diff); 112 if (rv != KERN_SUCCESS) { 113 uprintf("sbrk: shrink failed, return = %d\n", rv); 114 return(ENOMEM); 115 } 116 vm->vm_dsize -= btoc(diff); 117 118 } 119 return(0); 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; 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; 196 197 for (entry = map->header.next; entry != &map->header; 198 entry = entry->next) { 199 200 /* should never happen for a user process */ 201 if (UVM_ET_ISSUBMAP(entry)) { 202 panic("uvm_coredump: user process with submap?"); 203 } 204 205 if (!(entry->protection & VM_PROT_WRITE)) 206 continue; 207 208 start = entry->start; 209 end = entry->end; 210 211 if (start >= VM_MAXUSER_ADDRESS) 212 continue; 213 214 if (end > VM_MAXUSER_ADDRESS) 215 end = VM_MAXUSER_ADDRESS; 216 217 if (start >= (vaddr_t)vm->vm_maxsaddr) { 218 flag = CORE_STACK; 219 start = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 220 if (start >= end) 221 continue; 222 } else 223 flag = CORE_DATA; 224 225 /* 226 * Set up a new core file segment. 227 */ 228 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 229 cseg.c_addr = start; 230 cseg.c_size = end - start; 231 232 error = vn_rdwr(UIO_WRITE, vp, 233 (caddr_t)&cseg, chdr->c_seghdrsize, 234 offset, UIO_SYSSPACE, 235 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 236 if (error) 237 break; 238 239 offset += chdr->c_seghdrsize; 240 error = vn_rdwr(UIO_WRITE, vp, 241 (caddr_t)cseg.c_addr, (int)cseg.c_size, 242 offset, UIO_USERSPACE, 243 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 244 if (error) 245 break; 246 247 offset += cseg.c_size; 248 chdr->c_nseg++; 249 } 250 251 return (error); 252 } 253 254 #if COMPAT_NETBSD32 255 /* 256 * uvm_coredump32: dump 32-bit core! 257 */ 258 259 int 260 uvm_coredump32(p, vp, cred, chdr) 261 struct proc *p; 262 struct vnode *vp; 263 struct ucred *cred; 264 struct core32 *chdr; 265 { 266 struct vmspace *vm = p->p_vmspace; 267 vm_map_t map = &vm->vm_map; 268 vm_map_entry_t entry; 269 vaddr_t start, end; 270 struct coreseg32 cseg; 271 off_t offset; 272 int flag, error = 0; 273 274 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 275 276 for (entry = map->header.next; entry != &map->header; 277 entry = entry->next) { 278 279 /* should never happen for a user process */ 280 if (UVM_ET_ISSUBMAP(entry)) { 281 panic("uvm_coredump: user process with submap?"); 282 } 283 284 if (!(entry->protection & VM_PROT_WRITE)) 285 continue; 286 287 start = entry->start; 288 end = entry->end; 289 290 if (start >= VM_MAXUSER_ADDRESS) 291 continue; 292 293 if (end > VM_MAXUSER_ADDRESS) 294 end = VM_MAXUSER_ADDRESS; 295 296 if (start >= (vaddr_t)vm->vm_maxsaddr) { 297 flag = CORE_STACK; 298 start = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 299 if (start >= end) 300 continue; 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)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