/* $OpenBSD: uvm_unix.c,v 1.47 2013/01/16 21:47:08 deraadt Exp $ */ /* $NetBSD: uvm_unix.c,v 1.18 2000/09/13 15:00:25 thorpej 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 /* * sys_obreak: set break */ int sys_obreak(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, base; int error; base = (vaddr_t)vm->vm_daddr; new = round_page((vaddr_t)SCARG(uap, nsize)); if (new < base || (new - base) > p->p_rlimit[RLIMIT_DATA].rlim_cur) return (ENOMEM); old = round_page(base + ptoa(vm->vm_dsize)); if (new == old) return (0); /* * grow or shrink? */ if (new > old) { error = uvm_map(&vm->vm_map, &old, new - old, NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RWX, UVM_INH_COPY, UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED| UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); if (error) { uprintf("sbrk: grow %ld failed, error = %d\n", new - old, error); return (ENOMEM); } vm->vm_dsize += atop(new - old); } else { uvm_deallocate(&vm->vm_map, new, old - new); vm->vm_dsize -= atop(old - new); } return (0); } /* * uvm_grow: enlarge the "stack segment" to include sp. */ void uvm_grow(struct proc *p, vaddr_t sp) { struct vmspace *vm = p->p_vmspace; int si; /* * For user defined stacks (from sendsig). */ if (sp < (vaddr_t)vm->vm_maxsaddr) return; /* * For common case of already allocated (from trap). */ #ifdef MACHINE_STACK_GROWS_UP if (sp < USRSTACK + ptoa(vm->vm_ssize)) #else if (sp >= USRSTACK - ptoa(vm->vm_ssize)) #endif return; /* * Really need to check vs limit and increment stack size if ok. */ #ifdef MACHINE_STACK_GROWS_UP si = atop(sp - USRSTACK) - vm->vm_ssize + 1; #else si = atop(USRSTACK - sp) - vm->vm_ssize; #endif if (vm->vm_ssize + si <= atop(p->p_rlimit[RLIMIT_STACK].rlim_cur)) vm->vm_ssize += si; } #ifndef SMALL_KERNEL /* * uvm_coredump: dump core! */ int uvm_coredump(struct proc *p, struct vnode *vp, struct ucred *cred, struct core *chdr) { struct vmspace *vm = p->p_vmspace; vm_map_t map = &vm->vm_map; vm_map_entry_t entry, safe; vaddr_t start, end, top; struct coreseg cseg; off_t offset, coffset; int csize, chunk, flag, error = 0; offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize; RB_FOREACH_SAFE(entry, uvm_map_addr, &map->addr, safe) { /* 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) && entry->start != p->p_sigcode) continue; /* * Don't dump mmaped devices. */ if (entry->object.uvm_obj != NULL && UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) 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 (USRSTACK <= start && start < (USRSTACK + MAXSSIZ)) { top = round_page(USRSTACK + ptoa(vm->vm_ssize)); if (end > top) end = top; if (start >= end) continue; #else if (start >= (vaddr_t)vm->vm_maxsaddr) { top = trunc_page(USRSTACK - ptoa(vm->vm_ssize)); if (start < top) start = top; if (start >= end) continue; #endif flag = CORE_STACK; } 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_UNIT, cred, NULL, p); /* * We might get an EFAULT on objects mapped beyond * EOF. Ignore the error. */ if (error && error != EFAULT) break; offset += chdr->c_seghdrsize; coffset = 0; csize = (int)cseg.c_size; do { if (p->p_siglist & sigmask(SIGKILL)) return (EINTR); /* Rest of the loop sleeps with lock held, so... */ yield(); chunk = MIN(csize, MAXPHYS); error = vn_rdwr(UIO_WRITE, vp, (caddr_t)(u_long)cseg.c_addr + coffset, chunk, offset + coffset, UIO_USERSPACE, IO_UNIT, cred, NULL, p); if (error) return (error); coffset += chunk; csize -= chunk; } while (csize > 0); offset += cseg.c_size; /* Discard the memory */ uvm_unmap(map, cseg.c_addr, cseg.c_addr + cseg.c_size); chdr->c_nseg++; } return (error); } int uvm_coredump_walkmap(struct proc *p, void *iocookie, int (*func)(struct proc *, void *, struct uvm_coredump_state *), void *cookie) { struct uvm_coredump_state state; struct vmspace *vm = p->p_vmspace; struct vm_map *map = &vm->vm_map; struct vm_map_entry *entry; vaddr_t top; int error; RB_FOREACH(entry, uvm_map_addr, &map->addr) { state.cookie = cookie; state.prot = entry->protection; state.flags = 0; /* 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) && entry->start != p->p_sigcode) continue; /* * Don't dump mmaped devices. */ if (entry->object.uvm_obj != NULL && UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) continue; state.start = entry->start; state.realend = entry->end; state.end = entry->end; if (state.start >= VM_MAXUSER_ADDRESS) continue; if (state.end > VM_MAXUSER_ADDRESS) state.end = VM_MAXUSER_ADDRESS; #ifdef MACHINE_STACK_GROWS_UP if (USRSTACK <= state.start && state.start < (USRSTACK + MAXSSIZ)) { top = round_page(USRSTACK + ptoa(vm->vm_ssize)); if (state.end > top) state.end = top; if (state.start >= state.end) continue; #else if (state.start >= (vaddr_t)vm->vm_maxsaddr) { top = trunc_page(USRSTACK - ptoa(vm->vm_ssize)); if (state.start < top) state.start = top; if (state.start >= state.end) continue; #endif state.flags |= UVM_COREDUMP_STACK; } error = (*func)(p, iocookie, &state); if (error) return (error); } return (0); } #endif /* !SMALL_KERNEL */