1 /* $NetBSD: uvm_unix.c,v 1.18 2000/09/13 15:00:25 thorpej 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 ssize_t diff; 81 int rv; 82 83 old = (vaddr_t)vm->vm_daddr; 84 new = round_page((vaddr_t)SCARG(uap, nsize)); 85 if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) 86 return (ENOMEM); 87 88 old = round_page(old + ptoa(vm->vm_dsize)); 89 diff = new - old; 90 91 if (diff == 0) 92 return (0); 93 94 /* 95 * grow or shrink? 96 */ 97 if (diff > 0) { 98 rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET, 99 0, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 100 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 101 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 102 if (rv == KERN_SUCCESS) { 103 vm->vm_dsize += atop(diff); 104 return (0); 105 } 106 } else { 107 rv = uvm_deallocate(&vm->vm_map, new, -diff); 108 if (rv == KERN_SUCCESS) { 109 vm->vm_dsize -= atop(-diff); 110 return (0); 111 } 112 } 113 114 uprintf("sbrk: %s %ld failed, return = %d\n", 115 diff > 0 ? "grow" : "shrink", 116 (long)(diff > 0 ? diff : -diff), rv); 117 return (ENOMEM); 118 } 119 120 /* 121 * uvm_grow: enlarge the "stack segment" to include sp. 122 */ 123 124 int 125 uvm_grow(p, sp) 126 struct proc *p; 127 vaddr_t sp; 128 { 129 struct vmspace *vm = p->p_vmspace; 130 int si; 131 132 /* 133 * For user defined stacks (from sendsig). 134 */ 135 if (sp < (vaddr_t)vm->vm_maxsaddr) 136 return (0); 137 138 /* 139 * For common case of already allocated (from trap). 140 */ 141 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 142 return (1); 143 144 /* 145 * Really need to check vs limit and increment stack size if ok. 146 */ 147 si = btoc(USRSTACK-sp) - vm->vm_ssize; 148 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 149 return (0); 150 vm->vm_ssize += si; 151 return (1); 152 } 153 154 /* 155 * sys_oadvise: old advice system call 156 */ 157 158 /* ARGSUSED */ 159 int 160 sys_ovadvise(p, v, retval) 161 struct proc *p; 162 void *v; 163 register_t *retval; 164 { 165 #if 0 166 struct sys_ovadvise_args /* { 167 syscallarg(int) anom; 168 } */ *uap = v; 169 #endif 170 171 return (EINVAL); 172 } 173 174 /* 175 * uvm_coredump: dump core! 176 */ 177 178 int 179 uvm_coredump(p, vp, cred, chdr) 180 struct proc *p; 181 struct vnode *vp; 182 struct ucred *cred; 183 struct core *chdr; 184 { 185 struct vmspace *vm = p->p_vmspace; 186 vm_map_t map = &vm->vm_map; 187 vm_map_entry_t entry; 188 vaddr_t start, end, maxstack; 189 struct coreseg cseg; 190 off_t offset; 191 int flag, error = 0; 192 193 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 194 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 195 196 for (entry = map->header.next; entry != &map->header; 197 entry = entry->next) { 198 199 /* should never happen for a user process */ 200 if (UVM_ET_ISSUBMAP(entry)) { 201 panic("uvm_coredump: user process with submap?"); 202 } 203 204 if (!(entry->protection & VM_PROT_WRITE)) 205 continue; 206 207 start = entry->start; 208 end = entry->end; 209 210 if (start >= VM_MAXUSER_ADDRESS) 211 continue; 212 213 if (end > VM_MAXUSER_ADDRESS) 214 end = VM_MAXUSER_ADDRESS; 215 216 if (start >= (vaddr_t)vm->vm_maxsaddr) { 217 if (end <= maxstack) 218 continue; 219 if (start < maxstack) 220 start = maxstack; 221 flag = CORE_STACK; 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, maxstack; 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 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 276 277 for (entry = map->header.next; entry != &map->header; 278 entry = entry->next) { 279 280 /* should never happen for a user process */ 281 if (UVM_ET_ISSUBMAP(entry)) { 282 panic("uvm_coredump: user process with submap?"); 283 } 284 285 if (!(entry->protection & VM_PROT_WRITE)) 286 continue; 287 288 start = entry->start; 289 end = entry->end; 290 291 if (start >= VM_MAXUSER_ADDRESS) 292 continue; 293 294 if (end > VM_MAXUSER_ADDRESS) 295 end = VM_MAXUSER_ADDRESS; 296 297 if (start >= (vaddr_t)vm->vm_maxsaddr) { 298 if (end <= maxstack) 299 continue; 300 if (start < maxstack) 301 start = maxstack; 302 flag = CORE_STACK; 303 } else 304 flag = CORE_DATA; 305 306 /* 307 * Set up a new core file segment. 308 */ 309 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 310 cseg.c_addr = start; 311 cseg.c_size = end - start; 312 313 error = vn_rdwr(UIO_WRITE, vp, 314 (caddr_t)&cseg, chdr->c_seghdrsize, 315 offset, UIO_SYSSPACE, 316 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 317 if (error) 318 break; 319 320 offset += chdr->c_seghdrsize; 321 error = vn_rdwr(UIO_WRITE, vp, 322 (caddr_t)(u_long)cseg.c_addr, (int)cseg.c_size, 323 offset, UIO_USERSPACE, 324 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 325 if (error) 326 break; 327 328 offset += cseg.c_size; 329 chdr->c_nseg++; 330 } 331 332 return (error); 333 } 334 335 #endif 336