uvm_unix.c revision 1.9
1 /* $NetBSD: uvm_unix.c,v 1.9 1999/12/04 23:14:40 fvdl 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 <vm/vm.h> 63 #include <uvm/uvm.h> 64 65 66 /* 67 * sys_obreak: set break 68 */ 69 70 int 71 sys_obreak(p, v, retval) 72 struct proc *p; 73 void *v; 74 register_t *retval; 75 { 76 struct sys_obreak_args /* { 77 syscallarg(char *) nsize; 78 } */ *uap = v; 79 register struct vmspace *vm = p->p_vmspace; 80 vaddr_t new, old; 81 int rv; 82 register int diff; 83 84 old = (vaddr_t)vm->vm_daddr; 85 new = round_page(SCARG(uap, nsize)); 86 if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) 87 return(ENOMEM); 88 89 old = round_page(old + ctob(vm->vm_dsize)); 90 diff = new - old; 91 92 /* 93 * grow or shrink? 94 */ 95 96 if (diff > 0) { 97 98 rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET, 99 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)); 102 103 if (rv != KERN_SUCCESS) { 104 uprintf("sbrk: grow failed, return = %d\n", rv); 105 return(ENOMEM); 106 } 107 vm->vm_dsize += btoc(diff); 108 109 } else if (diff < 0) { 110 111 diff = -diff; 112 rv = uvm_deallocate(&vm->vm_map, new, diff); 113 if (rv != KERN_SUCCESS) { 114 uprintf("sbrk: shrink failed, return = %d\n", rv); 115 return(ENOMEM); 116 } 117 vm->vm_dsize -= btoc(diff); 118 119 } 120 return(0); 121 } 122 123 /* 124 * uvm_grow: enlarge the "stack segment" to include sp. 125 */ 126 127 int 128 uvm_grow(p, sp) 129 struct proc *p; 130 vaddr_t sp; 131 { 132 register struct vmspace *vm = p->p_vmspace; 133 register int si; 134 135 /* 136 * For user defined stacks (from sendsig). 137 */ 138 if (sp < (vaddr_t)vm->vm_maxsaddr) 139 return (0); 140 141 /* 142 * For common case of already allocated (from trap). 143 */ 144 if (sp >= USRSTACK - ctob(vm->vm_ssize)) 145 return (1); 146 147 /* 148 * Really need to check vs limit and increment stack size if ok. 149 */ 150 si = btoc(USRSTACK-sp) - vm->vm_ssize; 151 if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) 152 return (0); 153 vm->vm_ssize += si; 154 return (1); 155 } 156 157 /* 158 * sys_oadvise: old advice system call 159 */ 160 161 /* ARGSUSED */ 162 int 163 sys_ovadvise(p, v, retval) 164 struct proc *p; 165 void *v; 166 register_t *retval; 167 { 168 #if 0 169 struct sys_ovadvise_args /* { 170 syscallarg(int) anom; 171 } */ *uap = v; 172 #endif 173 174 return (EINVAL); 175 } 176 177 /* 178 * uvm_coredump: dump core! 179 */ 180 181 int 182 uvm_coredump(p, vp, cred, chdr) 183 struct proc *p; 184 struct vnode *vp; 185 struct ucred *cred; 186 struct core *chdr; 187 { 188 register struct vmspace *vm = p->p_vmspace; 189 register vm_map_t map = &vm->vm_map; 190 register vm_map_entry_t entry; 191 vaddr_t start, end; 192 struct coreseg cseg; 193 off_t offset; 194 int flag, error = 0; 195 196 offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; 197 198 for (entry = map->header.next; entry != &map->header; 199 entry = entry->next) { 200 201 /* should never happen for a user process */ 202 if (UVM_ET_ISSUBMAP(entry)) { 203 panic("uvm_coredump: user process with submap?"); 204 } 205 206 if (!(entry->protection & VM_PROT_WRITE)) 207 continue; 208 209 start = entry->start; 210 end = entry->end; 211 212 if (start >= VM_MAXUSER_ADDRESS) 213 continue; 214 215 if (end > VM_MAXUSER_ADDRESS) 216 end = VM_MAXUSER_ADDRESS; 217 218 if (start >= (vaddr_t)vm->vm_maxsaddr) { 219 flag = CORE_STACK; 220 start = trunc_page(USRSTACK - ctob(vm->vm_ssize)); 221 if (start >= end) 222 continue; 223 } else 224 flag = CORE_DATA; 225 226 /* 227 * Set up a new core file segment. 228 */ 229 CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); 230 cseg.c_addr = start; 231 cseg.c_size = end - start; 232 233 error = vn_rdwr(UIO_WRITE, vp, 234 (caddr_t)&cseg, chdr->c_seghdrsize, 235 offset, UIO_SYSSPACE, 236 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 237 if (error) 238 break; 239 240 offset += chdr->c_seghdrsize; 241 error = vn_rdwr(UIO_WRITE, vp, 242 (caddr_t)cseg.c_addr, (int)cseg.c_size, 243 offset, UIO_USERSPACE, 244 IO_NODELOCKED|IO_UNIT, cred, NULL, p); 245 if (error) 246 break; 247 248 offset += cseg.c_size; 249 chdr->c_nseg++; 250 } 251 252 return (error); 253 } 254 255
Indexes created Tue Sep 23 14:10:03 GMT 2025