ff2955473b
describe the process memory layout). Fudge the a.out core code to not dump the entire contents. I'm not sue that anything can read a.out core files - more progress might be made on such dumps by converting the a.out file to elf!
216 lines
6.5 KiB
C
216 lines
6.5 KiB
C
/* $NetBSD: uvm_coredump.c,v 1.6 2014/01/07 07:59:03 dsl Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1991, 1993, The Regents of the University of California.
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*
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vm_glue.c 8.6 (Berkeley) 1/5/94
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* from: Id: uvm_glue.c,v 1.1.2.8 1998/02/07 01:16:54 chs Exp
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: uvm_coredump.c,v 1.6 2014/01/07 07:59:03 dsl Exp $");
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/*
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* uvm_coredump.c: glue functions for coredump
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <uvm/uvm.h>
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/*
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* uvm_coredump_walkmap: walk a process's map for the purpose of dumping
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* a core file.
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* XXX: I'm not entirely sure the locking is this function is in anyway
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* correct. If the process isn't actually stopped then the data passed
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* to func() is at best stale, and horrid things might happen if the
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* entry being processed is deleted (dsl).
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*/
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int
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uvm_coredump_walkmap(struct proc *p, int (*func)(struct uvm_coredump_state *),
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void *cookie)
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{
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struct uvm_coredump_state state;
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struct vmspace *vm = p->p_vmspace;
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struct vm_map *map = &vm->vm_map;
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struct vm_map_entry *entry;
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int error;
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entry = NULL;
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vm_map_lock_read(map);
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state.end = 0;
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for (;;) {
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if (entry == NULL)
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entry = map->header.next;
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else if (!uvm_map_lookup_entry(map, state.end, &entry))
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entry = entry->next;
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if (entry == &map->header)
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break;
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state.cookie = cookie;
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if (state.end > entry->start) {
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state.start = state.end;
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} else {
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state.start = entry->start;
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}
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state.realend = entry->end;
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state.end = entry->end;
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state.prot = entry->protection;
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state.flags = 0;
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/*
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* Dump the region unless one of the following is true:
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*
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* (1) the region has neither object nor amap behind it
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* (ie. it has never been accessed).
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*
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* (2) the region has no amap and is read-only
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* (eg. an executable text section).
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*
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* (3) the region's object is a device.
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*
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* (4) the region is unreadable by the process.
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*/
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KASSERT(!UVM_ET_ISSUBMAP(entry));
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KASSERT(state.start < VM_MAXUSER_ADDRESS);
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KASSERT(state.end <= VM_MAXUSER_ADDRESS);
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if (entry->object.uvm_obj == NULL &&
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entry->aref.ar_amap == NULL) {
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state.realend = state.start;
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} else if ((entry->protection & VM_PROT_WRITE) == 0 &&
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entry->aref.ar_amap == NULL) {
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state.realend = state.start;
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} else if (entry->object.uvm_obj != NULL &&
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UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) {
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state.realend = state.start;
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} else if ((entry->protection & VM_PROT_READ) == 0) {
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state.realend = state.start;
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} else {
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if (state.start >= (vaddr_t)vm->vm_maxsaddr)
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state.flags |= UVM_COREDUMP_STACK;
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/*
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* If this an anonymous entry, only dump instantiated
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* pages.
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*/
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if (entry->object.uvm_obj == NULL) {
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vaddr_t end;
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amap_lock(entry->aref.ar_amap);
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for (end = state.start;
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end < state.end; end += PAGE_SIZE) {
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struct vm_anon *anon;
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anon = amap_lookup(&entry->aref,
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end - entry->start);
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/*
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* If we have already encountered an
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* uninstantiated page, stop at the
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* first instantied page.
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*/
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if (anon != NULL &&
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state.realend != state.end) {
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state.end = end;
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break;
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}
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/*
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* If this page is the first
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* uninstantiated page, mark this as
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* the real ending point. Continue to
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* counting uninstantiated pages.
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*/
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if (anon == NULL &&
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state.realend == state.end) {
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state.realend = end;
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}
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}
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amap_unlock(entry->aref.ar_amap);
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}
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}
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vm_map_unlock_read(map);
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error = (*func)(&state);
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if (error)
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return (error);
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vm_map_lock_read(map);
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}
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vm_map_unlock_read(map);
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return (0);
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}
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static int
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count_segs(struct uvm_coredump_state *s)
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{
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(*(int *)s->cookie)++;
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return 0;
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}
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int
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uvm_coredump_count_segs(struct proc *p)
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{
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int count = 0;
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uvm_coredump_walkmap(p, count_segs, &count);
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return count;
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}
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