1 /* $NetBSD: uvm_unix.c,v 1.25 2001/11/10 07:37:01 lukem 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 52 #include <sys/cdefs.h> 53 __KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.25 2001/11/10 07:37:01 lukem Exp $"); 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/proc.h> 58 #include <sys/resourcevar.h> 59 #include <sys/vnode.h> 60 #include <sys/core.h> 61 62 #include <sys/mount.h> 63 #include <sys/syscallargs.h> 64 65 #include <uvm/uvm.h> 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 struct vmspace *vm = p->p_vmspace; 81 vaddr_t new, old; 82 int error; 83 84 old = (vaddr_t)vm->vm_daddr; 85 new = round_page((vaddr_t)SCARG(uap, nsize)); 86 if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old) 87 return (ENOMEM); 88 89 old = round_page(old + ptoa(vm->vm_dsize)); 90 91 if (new == old) 92 return (0); 93 94 /* 95 * grow or shrink? 96 */ 97 if (new > old) { 98 error = uvm_map(&vm->vm_map, &old, new - old, 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 new - old, error); 106 return error; 107 } 108 vm->vm_dsize += atop(new - old); 109 } else { 110 uvm_deallocate(&vm->vm_map, new, old - new); 111 vm->vm_dsize -= atop(old - new); 112 } 113 return 0; 114 } 115 116 /* 117 * uvm_grow: enlarge the "stack segment" to include sp. 118 */ 119 120 int 121 uvm_grow(p, sp) 122 struct proc *p; 123 vaddr_t sp; 124 { 125 struct vmspace *vm = p->p_vmspace; 126 int si; 127 128 /* 129 * For user defined stacks (from sendsig). 130 */ 131 if (sp < (vaddr_t)vm->vm_maxsaddr) 132 return (0); 133 134 /* 135 * For common case of already allocated (from trap). 136 */ 137 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 138 return (1); 139 140 /* 141 * Really need to check vs limit and increment stack size if ok. 142 */ 143 si = btoc(USRSTACK-sp) - vm->vm_ssize; 144 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 145 return (0); 146 vm->vm_ssize += si; 147 return (1); 148 } 149 150 /* 151 * sys_oadvise: old advice system call 152 */ 153 154 /* ARGSUSED */ 155 int 156 sys_ovadvise(p, v, retval) 157 struct proc *p; 158 void *v; 159 register_t *retval; 160 { 161 #if 0 162 struct sys_ovadvise_args /* { 163 syscallarg(int) anom; 164 } */ *uap = v; 165 #endif 166 167 return (EINVAL); 168 } 169 170 /* 171 * uvm_coredump: dump core! 172 */ 173 174 int 175 uvm_coredump(p, vp, cred, chdr) 176 struct proc *p; 177 struct vnode *vp; 178 struct ucred *cred; 179 struct core *chdr; 180 { 181 struct vmspace *vm = p->p_vmspace; 182 struct vm_map *map = &vm->vm_map; 183 struct vm_map_entry *entry; 184 vaddr_t start, end, maxstack; 185 struct coreseg cseg; 186 off_t offset; 187 int flag, error = 0; 188 189 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 190 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 191 192 for (entry = map->header.next; entry != &map->header; 193 entry = entry->next) { 194 195 /* should never happen for a user process */ 196 if (UVM_ET_ISSUBMAP(entry)) { 197 panic("uvm_coredump: user process with submap?"); 198 } 199 200 if (!(entry->protection & VM_PROT_WRITE)) 201 continue; 202 203 start = entry->start; 204 end = entry->end; 205 206 if (start >= VM_MAXUSER_ADDRESS) 207 continue; 208 209 if (end > VM_MAXUSER_ADDRESS) 210 end = VM_MAXUSER_ADDRESS; 211 212 if (start >= (vaddr_t)vm->vm_maxsaddr) { 213 if (end <= maxstack) 214 continue; 215 if (start < maxstack) 216 start = maxstack; 217 flag = CORE_STACK; 218 } else 219 flag = CORE_DATA; 220 221 /* 222 * Set up a new core file segment. 223 */ 224 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 225 cseg.c_addr = start; 226 cseg.c_size = end - start; 227 228 error = vn_rdwr(UIO_WRITE, vp, 229 (caddr_t)&cseg, chdr->c_seghdrsize, 230 offset, UIO_SYSSPACE, 231 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 232 if (error) 233 break; 234 235 offset += chdr->c_seghdrsize; 236 error = vn_rdwr(UIO_WRITE, vp, 237 (caddr_t)cseg.c_addr, (int)cseg.c_size, 238 offset, UIO_USERSPACE, 239 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 240 if (error) 241 break; 242 243 offset += cseg.c_size; 244 chdr->c_nseg++; 245 } 246 247 return (error); 248 } 249