Annotation of sys/uvm/uvm_unix.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: uvm_unix.c,v 1.28 2007/04/11 12:51:51 miod Exp $ */
! 2: /* $NetBSD: uvm_unix.c,v 1.18 2000/09/13 15:00:25 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1997 Charles D. Cranor and Washington University.
! 6: * Copyright (c) 1991, 1993 The Regents of the University of California.
! 7: * Copyright (c) 1988 University of Utah.
! 8: *
! 9: * All rights reserved.
! 10: *
! 11: * This code is derived from software contributed to Berkeley by
! 12: * the Systems Programming Group of the University of Utah Computer
! 13: * Science Department.
! 14: *
! 15: * Redistribution and use in source and binary forms, with or without
! 16: * modification, are permitted provided that the following conditions
! 17: * are met:
! 18: * 1. Redistributions of source code must retain the above copyright
! 19: * notice, this list of conditions and the following disclaimer.
! 20: * 2. Redistributions in binary form must reproduce the above copyright
! 21: * notice, this list of conditions and the following disclaimer in the
! 22: * documentation and/or other materials provided with the distribution.
! 23: * 3. All advertising materials mentioning features or use of this software
! 24: * must display the following acknowledgement:
! 25: * This product includes software developed by Charles D. Cranor,
! 26: * Washington University, the University of California, Berkeley and
! 27: * its contributors.
! 28: * 4. Neither the name of the University nor the names of its contributors
! 29: * may be used to endorse or promote products derived from this software
! 30: * without specific prior written permission.
! 31: *
! 32: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 33: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 34: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 35: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 36: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 37: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 38: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 39: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 40: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 41: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 42: * SUCH DAMAGE.
! 43: *
! 44: * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
! 45: * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
! 46: * from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp
! 47: */
! 48:
! 49: /*
! 50: * uvm_unix.c: traditional sbrk/grow interface to vm.
! 51: */
! 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: int error;
! 81:
! 82: old = (vaddr_t)vm->vm_daddr;
! 83: new = round_page((vaddr_t)SCARG(uap, nsize));
! 84: if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
! 85: return (ENOMEM);
! 86:
! 87: old = round_page(old + ptoa(vm->vm_dsize));
! 88:
! 89: if (new == old)
! 90: return (0);
! 91:
! 92: /*
! 93: * grow or shrink?
! 94: */
! 95: if (new > old) {
! 96: error = uvm_map(&vm->vm_map, &old, new - old, NULL,
! 97: UVM_UNKNOWN_OFFSET, 0,
! 98: UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RWX, UVM_INH_COPY,
! 99: UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED|
! 100: UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW));
! 101: if (error) {
! 102: uprintf("sbrk: grow %ld failed, error = %d\n",
! 103: new - old, error);
! 104: return (ENOMEM);
! 105: }
! 106: vm->vm_dsize += atop(new - old);
! 107: } else {
! 108: uvm_deallocate(&vm->vm_map, new, old - new);
! 109: vm->vm_dsize -= atop(old - new);
! 110: }
! 111:
! 112: return (0);
! 113: }
! 114:
! 115: /*
! 116: * uvm_grow: enlarge the "stack segment" to include sp.
! 117: */
! 118:
! 119: void
! 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;
! 132:
! 133: /*
! 134: * For common case of already allocated (from trap).
! 135: */
! 136: #ifdef MACHINE_STACK_GROWS_UP
! 137: if (sp < USRSTACK + ctob(vm->vm_ssize))
! 138: #else
! 139: if (sp >= USRSTACK - ctob(vm->vm_ssize))
! 140: #endif
! 141: return;
! 142:
! 143: /*
! 144: * Really need to check vs limit and increment stack size if ok.
! 145: */
! 146: #ifdef MACHINE_STACK_GROWS_UP
! 147: si = btoc(sp - USRSTACK) - vm->vm_ssize;
! 148: #else
! 149: si = btoc(USRSTACK - sp) - vm->vm_ssize;
! 150: #endif
! 151: if (vm->vm_ssize + si <= btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
! 152: vm->vm_ssize += si;
! 153: }
! 154:
! 155: /*
! 156: * sys_oadvise: old advice system call
! 157: */
! 158:
! 159: /* ARGSUSED */
! 160: int
! 161: sys_ovadvise(p, v, retval)
! 162: struct proc *p;
! 163: void *v;
! 164: register_t *retval;
! 165: {
! 166: #if 0
! 167: struct sys_ovadvise_args /* {
! 168: syscallarg(int) anom;
! 169: } */ *uap = v;
! 170: #endif
! 171:
! 172: return (EINVAL);
! 173: }
! 174:
! 175: /*
! 176: * uvm_coredump: dump core!
! 177: */
! 178:
! 179: int
! 180: uvm_coredump(p, vp, cred, chdr)
! 181: struct proc *p;
! 182: struct vnode *vp;
! 183: struct ucred *cred;
! 184: struct core *chdr;
! 185: {
! 186: struct vmspace *vm = p->p_vmspace;
! 187: vm_map_t map = &vm->vm_map;
! 188: vm_map_entry_t entry;
! 189: vaddr_t start, end;
! 190: struct coreseg cseg;
! 191: off_t offset;
! 192: int flag, error = 0;
! 193:
! 194: offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize;
! 195:
! 196: for (entry = map->header.next; entry != &map->header;
! 197: entry = entry->next) {
! 198:
! 199: /* should never happen for a user process */
! 200: if (UVM_ET_ISSUBMAP(entry)) {
! 201: panic("uvm_coredump: user process with submap?");
! 202: }
! 203:
! 204: if (!(entry->protection & VM_PROT_WRITE))
! 205: continue;
! 206:
! 207: /*
! 208: * Don't dump mmaped devices.
! 209: */
! 210: if (entry->object.uvm_obj != NULL &&
! 211: UVM_OBJ_IS_DEVICE(entry->object.uvm_obj))
! 212: continue;
! 213:
! 214: start = entry->start;
! 215: end = entry->end;
! 216:
! 217: if (start >= VM_MAXUSER_ADDRESS)
! 218: continue;
! 219:
! 220: if (end > VM_MAXUSER_ADDRESS)
! 221: end = VM_MAXUSER_ADDRESS;
! 222:
! 223: #ifdef MACHINE_STACK_GROWS_UP
! 224: if (USRSTACK <= start && start < (USRSTACK + MAXSSIZ)) {
! 225: end = round_page(USRSTACK + ctob(vm->vm_ssize));
! 226: if (start >= end)
! 227: continue;
! 228: start = USRSTACK;
! 229: #else
! 230: if (start >= (vaddr_t)vm->vm_maxsaddr) {
! 231: start = trunc_page(USRSTACK - ctob(vm->vm_ssize));
! 232:
! 233: if (start >= end)
! 234: continue;
! 235: #endif
! 236: flag = CORE_STACK;
! 237: } else
! 238: flag = CORE_DATA;
! 239:
! 240: /*
! 241: * Set up a new core file segment.
! 242: */
! 243: CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag);
! 244: cseg.c_addr = start;
! 245: cseg.c_size = end - start;
! 246:
! 247: error = vn_rdwr(UIO_WRITE, vp,
! 248: (caddr_t)&cseg, chdr->c_seghdrsize,
! 249: offset, UIO_SYSSPACE,
! 250: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 251: /*
! 252: * We might get an EFAULT on objects mapped beyond
! 253: * EOF. Ignore the error.
! 254: */
! 255: if (error && error != EFAULT)
! 256: break;
! 257:
! 258: offset += chdr->c_seghdrsize;
! 259: error = vn_rdwr(UIO_WRITE, vp,
! 260: (caddr_t)(u_long)cseg.c_addr, (int)cseg.c_size,
! 261: offset, UIO_USERSPACE,
! 262: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 263: if (error)
! 264: break;
! 265:
! 266: offset += cseg.c_size;
! 267: chdr->c_nseg++;
! 268: }
! 269:
! 270: return (error);
! 271: }
! 272:
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