1 /* $NetBSD: uvm_unix.c,v 1.10 1999/12/30 16:09:47 eeh 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 <vm/vm.h> 64 #include <uvm/uvm.h> 65 66 67 /* 68 * sys_obreak: set break 69 */ 70 71 int 72 sys_obreak(p, v, retval) 73 struct proc *p; 74 void *v; 75 register_t *retval; 76 { 77 struct sys_obreak_args /* { 78 syscallarg(char *) nsize; 79 } */ *uap = v; 80 register struct vmspace *vm = p->p_vmspace; 81 vaddr_t new, old; 82 int rv; 83 register int diff; 84 85 old = (vaddr_t)vm->vm_daddr; 86 new = round_page(SCARG(uap, nsize)); 87 if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) 88 return(ENOMEM); 89 90 old = round_page(old + ctob(vm->vm_dsize)); 91 diff = new - old; 92 93 /* 94 * grow or shrink? 95 */ 96 97 if (diff > 0) { 98 99 rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET, 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)); 103 104 if (rv != KERN_SUCCESS) { 105 uprintf("sbrk: grow failed, return = %d\n", rv); 106 return(ENOMEM); 107 } 108 vm->vm_dsize += btoc(diff); 109 110 } else if (diff < 0) { 111 112 diff = -diff; 113 rv = uvm_deallocate(&vm->vm_map, new, diff); 114 if (rv != KERN_SUCCESS) { 115 uprintf("sbrk: shrink failed, return = %d\n", rv); 116 return(ENOMEM); 117 } 118 vm->vm_dsize -= btoc(diff); 119 120 } 121 return(0); 122 } 123 124 /* 125 * uvm_grow: enlarge the "stack segment" to include sp. 126 */ 127 128 int 129 uvm_grow(p, sp) 130 struct proc *p; 131 vaddr_t sp; 132 { 133 register struct vmspace *vm = p->p_vmspace; 134 register int si; 135 136 /* 137 * For user defined stacks (from sendsig). 138 */ 139 if (sp < (vaddr_t)vm->vm_maxsaddr) 140 return (0); 141 142 /* 143 * For common case of already allocated (from trap). 144 */ 145 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 146 return (1); 147 148 /* 149 * Really need to check vs limit and increment stack size if ok. 150 */ 151 si = btoc(USRSTACK-sp) - vm->vm_ssize; 152 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 153 return (0); 154 vm->vm_ssize += si; 155 return (1); 156 } 157 158 /* 159 * sys_oadvise: old advice system call 160 */ 161 162 /* ARGSUSED */ 163 int 164 sys_ovadvise(p, v, retval) 165 struct proc *p; 166 void *v; 167 register_t *retval; 168 { 169 #if 0 170 struct sys_ovadvise_args /* { 171 syscallarg(int) anom; 172 } */ *uap = v; 173 #endif 174 175 return (EINVAL); 176 } 177 178 /* 179 * uvm_coredump: dump core! 180 */ 181 182 int 183 uvm_coredump(p, vp, cred, chdr) 184 struct proc *p; 185 struct vnode *vp; 186 struct ucred *cred; 187 struct core *chdr; 188 { 189 register struct vmspace *vm = p->p_vmspace; 190 register vm_map_t map = &vm->vm_map; 191 register vm_map_entry_t entry; 192 vaddr_t start, end; 193 struct coreseg cseg; 194 off_t offset; 195 int flag, error = 0; 196 197 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 198 199 for (entry = map->header.next; entry != &map->header; 200 entry = entry->next) { 201 202 /* should never happen for a user process */ 203 if (UVM_ET_ISSUBMAP(entry)) { 204 panic("uvm_coredump: user process with submap?"); 205 } 206 207 if (!(entry->protection & VM_PROT_WRITE)) 208 continue; 209 210 start = entry->start; 211 end = entry->end; 212 213 if (start >= VM_MAXUSER_ADDRESS) 214 continue; 215 216 if (end > VM_MAXUSER_ADDRESS) 217 end = VM_MAXUSER_ADDRESS; 218 219 if (start >= (vaddr_t)vm->vm_maxsaddr) { 220 flag = CORE_STACK; 221 start = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 222 if (start >= end) 223 continue; 224 } else 225 flag = CORE_DATA; 226 227 /* 228 * Set up a new core file segment. 229 */ 230 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 231 cseg.c_addr = start; 232 cseg.c_size = end - start; 233 234 error = vn_rdwr(UIO_WRITE, vp, 235 (caddr_t)&cseg, chdr->c_seghdrsize, 236 offset, UIO_SYSSPACE, 237 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 238 if (error) 239 break; 240 241 offset += chdr->c_seghdrsize; 242 error = vn_rdwr(UIO_WRITE, vp, 243 (caddr_t)cseg.c_addr, (int)cseg.c_size, 244 offset, UIO_USERSPACE, 245 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 246 if (error) 247 break; 248 249 offset += cseg.c_size; 250 chdr->c_nseg++; 251 } 252 253 return (error); 254 } 255 256 #if COMPAT_NETBSD32 257 /* 258 * uvm_coredump32: dump 32-bit core! 259 */ 260 261 int 262 uvm_coredump32(p, vp, cred, chdr) 263 struct proc *p; 264 struct vnode *vp; 265 struct ucred *cred; 266 struct core32 *chdr; 267 { 268 register struct vmspace *vm = p->p_vmspace; 269 register vm_map_t map = &vm->vm_map; 270 register vm_map_entry_t entry; 271 vaddr_t start, end; 272 struct coreseg32 cseg; 273 off_t offset; 274 int flag, error = 0; 275 276 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 277 278 for (entry = map->header.next; entry != &map->header; 279 entry = entry->next) { 280 281 /* should never happen for a user process */ 282 if (UVM_ET_ISSUBMAP(entry)) { 283 panic("uvm_coredump: user process with submap?"); 284 } 285 286 if (!(entry->protection & VM_PROT_WRITE)) 287 continue; 288 289 start = entry->start; 290 end = entry->end; 291 292 if (start >= VM_MAXUSER_ADDRESS) 293 continue; 294 295 if (end > VM_MAXUSER_ADDRESS) 296 end = VM_MAXUSER_ADDRESS; 297 298 if (start >= (vaddr_t)vm->vm_maxsaddr) { 299 flag = CORE_STACK; 300 start = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 301 if (start >= end) 302 continue; 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)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