1 /* $NetBSD: uvm_unix.c,v 1.24 2001/06/06 21:28:51 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 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/proc.h> 55 #include <sys/resourcevar.h> 56 #include <sys/vnode.h> 57 #include <sys/core.h> 58 59 #include <sys/mount.h> 60 #include <sys/syscallargs.h> 61 62 #include <uvm/uvm.h> 63 64 /* 65 * sys_obreak: set break 66 */ 67 68 int 69 sys_obreak(p, v, retval) 70 struct proc *p; 71 void *v; 72 register_t *retval; 73 { 74 struct sys_obreak_args /* { 75 syscallarg(char *) nsize; 76 } */ *uap = v; 77 struct vmspace *vm = p->p_vmspace; 78 vaddr_t new, old; 79 int error; 80 81 old = (vaddr_t)vm->vm_daddr; 82 new = round_page((vaddr_t)SCARG(uap, nsize)); 83 if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old) 84 return (ENOMEM); 85 86 old = round_page(old + ptoa(vm->vm_dsize)); 87 88 if (new == old) 89 return (0); 90 91 /* 92 * grow or shrink? 93 */ 94 if (new > old) { 95 error = uvm_map(&vm->vm_map, &old, new - old, NULL, 96 UVM_UNKNOWN_OFFSET, 0, 97 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 98 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| 99 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 100 if (error) { 101 uprintf("sbrk: grow %ld failed, error = %d\n", 102 new - old, error); 103 return error; 104 } 105 vm->vm_dsize += atop(new - old); 106 } else { 107 uvm_deallocate(&vm->vm_map, new, old - new); 108 vm->vm_dsize -= atop(old - new); 109 } 110 return 0; 111 } 112 113 /* 114 * uvm_grow: enlarge the "stack segment" to include sp. 115 */ 116 117 int 118 uvm_grow(p, sp) 119 struct proc *p; 120 vaddr_t sp; 121 { 122 struct vmspace *vm = p->p_vmspace; 123 int si; 124 125 /* 126 * For user defined stacks (from sendsig). 127 */ 128 if (sp < (vaddr_t)vm->vm_maxsaddr) 129 return (0); 130 131 /* 132 * For common case of already allocated (from trap). 133 */ 134 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 135 return (1); 136 137 /* 138 * Really need to check vs limit and increment stack size if ok. 139 */ 140 si = btoc(USRSTACK-sp) - vm->vm_ssize; 141 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 142 return (0); 143 vm->vm_ssize += si; 144 return (1); 145 } 146 147 /* 148 * sys_oadvise: old advice system call 149 */ 150 151 /* ARGSUSED */ 152 int 153 sys_ovadvise(p, v, retval) 154 struct proc *p; 155 void *v; 156 register_t *retval; 157 { 158 #if 0 159 struct sys_ovadvise_args /* { 160 syscallarg(int) anom; 161 } */ *uap = v; 162 #endif 163 164 return (EINVAL); 165 } 166 167 /* 168 * uvm_coredump: dump core! 169 */ 170 171 int 172 uvm_coredump(p, vp, cred, chdr) 173 struct proc *p; 174 struct vnode *vp; 175 struct ucred *cred; 176 struct core *chdr; 177 { 178 struct vmspace *vm = p->p_vmspace; 179 struct vm_map *map = &vm->vm_map; 180 struct vm_map_entry *entry; 181 vaddr_t start, end, maxstack; 182 struct coreseg cseg; 183 off_t offset; 184 int flag, error = 0; 185 186 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 187 maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 188 189 for (entry = map->header.next; entry != &map->header; 190 entry = entry->next) { 191 192 /* should never happen for a user process */ 193 if (UVM_ET_ISSUBMAP(entry)) { 194 panic("uvm_coredump: user process with submap?"); 195 } 196 197 if (!(entry->protection & VM_PROT_WRITE)) 198 continue; 199 200 start = entry->start; 201 end = entry->end; 202 203 if (start >= VM_MAXUSER_ADDRESS) 204 continue; 205 206 if (end > VM_MAXUSER_ADDRESS) 207 end = VM_MAXUSER_ADDRESS; 208 209 if (start >= (vaddr_t)vm->vm_maxsaddr) { 210 if (end <= maxstack) 211 continue; 212 if (start < maxstack) 213 start = maxstack; 214 flag = CORE_STACK; 215 } else 216 flag = CORE_DATA; 217 218 /* 219 * Set up a new core file segment. 220 */ 221 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 222 cseg.c_addr = start; 223 cseg.c_size = end - start; 224 225 error = vn_rdwr(UIO_WRITE, vp, 226 (caddr_t)&cseg, chdr->c_seghdrsize, 227 offset, UIO_SYSSPACE, 228 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 229 if (error) 230 break; 231 232 offset += chdr->c_seghdrsize; 233 error = vn_rdwr(UIO_WRITE, vp, 234 (caddr_t)cseg.c_addr, (int)cseg.c_size, 235 offset, UIO_USERSPACE, 236 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 237 if (error) 238 break; 239 240 offset += cseg.c_size; 241 chdr->c_nseg++; 242 } 243 244 return (error); 245 } 246