/* $NetBSD: uvm_coredump.c,v 1.9 2025/08/10 19:49:39 andvar Exp $ */ /* * Copyright (c) 1997 Charles D. Cranor and Washington University. * Copyright (c) 1991, 1993, The Regents of the University of California. * * All rights reserved. * * This code is derived from software contributed to Berkeley by * The Mach Operating System project at Carnegie-Mellon University. * * 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. 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. * * @(#)vm_glue.c 8.6 (Berkeley) 1/5/94 * from: Id: uvm_glue.c,v 1.1.2.8 1998/02/07 01:16:54 chs Exp * * * Copyright (c) 1987, 1990 Carnegie-Mellon University. * All rights reserved. * * Permission to use, copy, modify and distribute this software and * its documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: uvm_coredump.c,v 1.9 2025/08/10 19:49:39 andvar Exp $"); /* * uvm_coredump.c: glue functions for coredump */ #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <uvm/uvm.h> /* * uvm_coredump_walkmap: walk a process's map for the purpose of dumping * a core file. * XXX: I'm not entirely sure the locking is this function is in anyway * correct. If the process isn't actually stopped then the data passed * to func() is at best stale, and horrid things might happen if the * entry being processed is deleted (dsl). */ int uvm_coredump_walkmap(struct proc *p, int (*func)(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; int error; entry = NULL; vm_map_lock_read(map); state.end = 0; for (;;) { if (entry == NULL) entry = map->header.next; else if (!uvm_map_lookup_entry(map, state.end, &entry)) entry = entry->next; if (entry == &map->header) break; state.cookie = cookie; if (state.end > entry->start) { state.start = state.end; } else { state.start = entry->start; } state.realend = entry->end; state.end = entry->end; state.prot = entry->protection; state.flags = 0; /* * Dump the region unless one of the following is true: * * (1) the region has neither object nor amap behind it * (ie. it has never been accessed). * * (2) the region has no amap and is read-only * (eg. an executable text section). * * (3) the region's object is a device. * * (4) the region is unreadable by the process. */ KASSERT(!UVM_ET_ISSUBMAP(entry)); #ifdef VM_MAXUSER_ADDRESS KASSERT(state.start < VM_MAXUSER_ADDRESS); KASSERT(state.end <= VM_MAXUSER_ADDRESS); #endif if (entry->object.uvm_obj == NULL && entry->aref.ar_amap == NULL) { state.realend = state.start; } else if ((entry->protection & VM_PROT_WRITE) == 0 && entry->aref.ar_amap == NULL) { state.realend = state.start; } else if (entry->object.uvm_obj != NULL && UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) { state.realend = state.start; } else if ((entry->protection & VM_PROT_READ) == 0) { state.realend = state.start; } else { if (state.start >= (vaddr_t)vm->vm_maxsaddr) state.flags |= UVM_COREDUMP_STACK; /* * If this an anonymous entry, only dump instantiated * pages. */ if (entry->object.uvm_obj == NULL) { vaddr_t end; amap_lock(entry->aref.ar_amap, RW_READER); for (end = state.start; end < state.end; end += PAGE_SIZE) { struct vm_anon *anon; anon = amap_lookup(&entry->aref, end - entry->start); /* * If we have already encountered an * uninstantiated page, stop at the * first instantiated page. */ if (anon != NULL && state.realend != state.end) { state.end = end; break; } /* * If this page is the first * uninstantiated page, mark this as * the real ending point. Continue to * counting uninstantiated pages. */ if (anon == NULL && state.realend == state.end) { state.realend = end; } } amap_unlock(entry->aref.ar_amap); } } vm_map_unlock_read(map); error = (*func)(&state); if (error) return (error); vm_map_lock_read(map); } vm_map_unlock_read(map); return (0); } static int count_segs(struct uvm_coredump_state *s) { (*(int *)s->cookie)++; return 0; } int uvm_coredump_count_segs(struct proc *p) { int count = 0; uvm_coredump_walkmap(p, count_segs, &count); return count; }
