/* $OpenBSD: uvm_unix.c,v 1.8 2001/01/29 02:07:50 niklas Exp $ */ /* $NetBSD: uvm_unix.c,v 1.8 1999/03/25 18:48:56 mrg Exp $ */ /* * Copyright (c) 1997 Charles D. Cranor and Washington University. * Copyright (c) 1991, 1993 The Regents of the University of California. * Copyright (c) 1988 University of Utah. * * All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Charles D. Cranor, * Washington University, the University of California, Berkeley and * its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 * from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp */ /* * uvm_unix.c: traditional sbrk/grow interface to vm. */ #include #include #include #include #include #include #include #include #include #include /* * sys_obreak: set break */ int sys_obreak(p, v, retval) struct proc *p; void *v; register_t *retval; { struct sys_obreak_args /* { syscallarg(char *) nsize; } */ *uap = v; struct vmspace *vm = p->p_vmspace; vaddr_t new, old; int rv; long diff; old = (vaddr_t)vm->vm_daddr; new = round_page(SCARG(uap, nsize)); if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) return(ENOMEM); old = round_page(old + ptoa(vm->vm_dsize)); diff = new - old; if (diff == 0) return (0); /* * grow or shrink? */ if (diff > 0) { rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); if (rv == KERN_SUCCESS) { vm->vm_dsize += atop(diff); return (0); } } else { rv = uvm_deallocate(&vm->vm_map, new, -diff); if (rv == KERN_SUCCESS) { vm->vm_dsize -= atop(-diff); return (0); } } uprintf("sbrk: %s %ld failed, return = %d\n", diff > 0 ? "grow" : "shrink", (long)(diff > 0 ? diff : -diff), rv); return(ENOMEM); } /* * uvm_grow: enlarge the "stack segment" to include sp. */ int uvm_grow(p, sp) struct proc *p; vaddr_t sp; { register struct vmspace *vm = p->p_vmspace; register int si; /* * For user defined stacks (from sendsig). */ #ifdef MACHINE_STACK_GROWS_UP if (sp > (vaddr_t)vm->vm_maxsaddr) #else if (sp < (vaddr_t)vm->vm_maxsaddr) #endif return (0); /* * For common case of already allocated (from trap). */ #ifdef MACHINE_STACK_GROWS_UP if (sp < USRSTACK + ctob(vm->vm_ssize)) #else if (sp >= USRSTACK - ctob(vm->vm_ssize)) #endif return (1); /* * Really need to check vs limit and increment stack size if ok. */ #ifdef MACHINE_STACK_GROWS_UP si = clrnd(btoc(sp - USRSTACK) - vm->vm_ssize); #else si = clrnd(btoc(USRSTACK-sp) - vm->vm_ssize); #endif if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) return (0); vm->vm_ssize += si; return (1); } /* * sys_oadvise: old advice system call */ /* ARGSUSED */ int sys_ovadvise(p, v, retval) struct proc *p; void *v; register_t *retval; { #if 0 struct sys_ovadvise_args /* { syscallarg(int) anom; } */ *uap = v; #endif return (EINVAL); } /* * uvm_coredump: dump core! */ int uvm_coredump(p, vp, cred, chdr) struct proc *p; struct vnode *vp; struct ucred *cred; struct core *chdr; { register struct vmspace *vm = p->p_vmspace; register vm_map_t map = &vm->vm_map; register vm_map_entry_t entry; vaddr_t start, end; struct coreseg cseg; off_t offset; int flag, error = 0; offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; for (entry = map->header.next; entry != &map->header; entry = entry->next) { /* should never happen for a user process */ if (UVM_ET_ISSUBMAP(entry)) { panic("uvm_coredump: user process with submap?"); } if (!(entry->protection & VM_PROT_WRITE)) continue; start = entry->start; end = entry->end; if (start >= VM_MAXUSER_ADDRESS) continue; if (end > VM_MAXUSER_ADDRESS) end = VM_MAXUSER_ADDRESS; #ifdef MACHINE_STACK_GROWS_UP if (start >= USRSTACK) { start = USRSTACK; #else if (start >= (vaddr_t)vm->vm_maxsaddr) { start = trunc_page(USRSTACK - ctob(vm->vm_ssize)); #endif flag = CORE_STACK; if (start >= end) continue; } else flag = CORE_DATA; /* * Set up a new core file segment. */ CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag); cseg.c_addr = start; cseg.c_size = end - start; error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize, offset, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, NULL, p); if (error) break; offset += chdr->c_seghdrsize; error = vn_rdwr(UIO_WRITE, vp, (caddr_t)cseg.c_addr, (int)cseg.c_size, offset, UIO_USERSPACE, IO_NODELOCKED|IO_UNIT, cred, NULL, p); if (error) break; offset += cseg.c_size; chdr->c_nseg++; } return (error); }