1 /* $NetBSD: uvm_unix.c,v 1.19 2001/03/15 06:10:58 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 <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 error; 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 error = uvm_map(&vm->vm_map, &old, diff, NULL, 99 UVM_UNKNOWN_OFFSET, 0, 100 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 101 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 102 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 103 if (error) { 104 uprintf("sbrk: grow %ld failed, error = %d\n", 105 (long)diff, error); 106 return error; 107 } 108 } else { 109 uvm_deallocate(&vm->vm_map, new, -diff); 110 } 111 vm->vm_dsize += atop(diff); 112 return 0; 113 } 114 115 /* 116 * uvm_grow: enlarge the "stack segment" to include sp. 117 */ 118 119 int 120 uvm_grow(p, sp) 121 struct proc *p; 122 vaddr_t sp; 123 { 124 struct vmspace *vm = p->p_vmspace; 125 int si; 126 127 /* 128 * For user defined stacks (from sendsig). 129 */ 130 if (sp < (vaddr_t)vm->vm_maxsaddr) 131 return (0); 132 133 /* 134 * For common case of already allocated (from trap). 135 */ 136 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 137 return (1); 138 139 /* 140 * Really need to check vs limit and increment stack size if ok. 141 */ 142 si = btoc(USRSTACK-sp) - vm->vm_ssize; 143 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 144 return (0); 145 vm->vm_ssize += si; 146 return (1); 147 } 148 149 /* 150 * sys_oadvise: old advice system call 151 */ 152 153 /* ARGSUSED */ 154 int 155 sys_ovadvise(p, v, retval) 156 struct proc *p; 157 void *v; 158 register_t *retval; 159 { 160 #if 0 161 struct sys_ovadvise_args /* { 162 syscallarg(int) anom; 163 } */ *uap = v; 164 #endif 165 166 return (EINVAL); 167 } 168 169 /* 170 * uvm_coredump: dump core! 171 */ 172 173 int 174 uvm_coredump(p, vp, cred, chdr) 175 struct proc *p; 176 struct vnode *vp; 177 struct ucred *cred; 178 struct core *chdr; 179 { 180 struct vmspace *vm = p->p_vmspace; 181 vm_map_t map = &vm->vm_map; 182 vm_map_entry_t entry; 183 vaddr_t start, end, maxstack; 184 struct coreseg cseg; 185 off_t offset; 186 int flag, error = 0; 187 188 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 189 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 190 191 for (entry = map->header.next; entry != &map->header; 192 entry = entry->next) { 193 194 /* should never happen for a user process */ 195 if (UVM_ET_ISSUBMAP(entry)) { 196 panic("uvm_coredump: user process with submap?"); 197 } 198 199 if (!(entry->protection & VM_PROT_WRITE)) 200 continue; 201 202 start = entry->start; 203 end = entry->end; 204 205 if (start >= VM_MAXUSER_ADDRESS) 206 continue; 207 208 if (end > VM_MAXUSER_ADDRESS) 209 end = VM_MAXUSER_ADDRESS; 210 211 if (start >= (vaddr_t)vm->vm_maxsaddr) { 212 if (end <= maxstack) 213 continue; 214 if (start < maxstack) 215 start = maxstack; 216 flag = CORE_STACK; 217 } else 218 flag = CORE_DATA; 219 220 /* 221 * Set up a new core file segment. 222 */ 223 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 224 cseg.c_addr = start; 225 cseg.c_size = end - start; 226 227 error = vn_rdwr(UIO_WRITE, vp, 228 (caddr_t)&cseg, chdr->c_seghdrsize, 229 offset, UIO_SYSSPACE, 230 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 231 if (error) 232 break; 233 234 offset += chdr->c_seghdrsize; 235 error = vn_rdwr(UIO_WRITE, vp, 236 (caddr_t)cseg.c_addr, (int)cseg.c_size, 237 offset, UIO_USERSPACE, 238 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 239 if (error) 240 break; 241 242 offset += cseg.c_size; 243 chdr->c_nseg++; 244 } 245 246 return (error); 247 } 248 249 #if COMPAT_NETBSD32 250 /* 251 * uvm_coredump32: dump 32-bit core! 252 */ 253 254 int 255 uvm_coredump32(p, vp, cred, chdr) 256 struct proc *p; 257 struct vnode *vp; 258 struct ucred *cred; 259 struct core32 *chdr; 260 { 261 struct vmspace *vm = p->p_vmspace; 262 vm_map_t map = &vm->vm_map; 263 vm_map_entry_t entry; 264 vaddr_t start, end, maxstack; 265 struct coreseg32 cseg; 266 off_t offset; 267 int flag, error = 0; 268 269 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 270 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 271 272 for (entry = map->header.next; entry != &map->header; 273 entry = entry->next) { 274 275 /* should never happen for a user process */ 276 if (UVM_ET_ISSUBMAP(entry)) { 277 panic("uvm_coredump: user process with submap?"); 278 } 279 280 if (!(entry->protection & VM_PROT_WRITE)) 281 continue; 282 283 start = entry->start; 284 end = entry->end; 285 286 if (start >= VM_MAXUSER_ADDRESS) 287 continue; 288 289 if (end > VM_MAXUSER_ADDRESS) 290 end = VM_MAXUSER_ADDRESS; 291 292 if (start >= (vaddr_t)vm->vm_maxsaddr) { 293 if (end <= maxstack) 294 continue; 295 if (start < maxstack) 296 start = maxstack; 297 flag = CORE_STACK; 298 } else 299 flag = CORE_DATA; 300 301 /* 302 * Set up a new core file segment. 303 */ 304 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 305 cseg.c_addr = start; 306 cseg.c_size = end - start; 307 308 error = vn_rdwr(UIO_WRITE, vp, 309 (caddr_t)&cseg, chdr->c_seghdrsize, 310 offset, UIO_SYSSPACE, 311 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 312 if (error) 313 break; 314 315 offset += chdr->c_seghdrsize; 316 error = vn_rdwr(UIO_WRITE, vp, 317 (caddr_t)(u_long)cseg.c_addr, (int)cseg.c_size, 318 offset, UIO_USERSPACE, 319 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 320 if (error) 321 break; 322 323 offset += cseg.c_size; 324 chdr->c_nseg++; 325 } 326 327 return (error); 328 } 329 330 #endif 331