218 lines
6.5 KiB
C
218 lines
6.5 KiB
C
/* $NetBSD: uvm_coredump.c,v 1.8 2020/02/23 15:46:43 ad 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 1.8 2020/02/23 15:46:43 ad 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 instantied 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;
|
|
}
|