158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/* $NetBSD: subr_debug.c,v 1.7 2008/04/30 20:20:53 ad Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Andrew Doran.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*
|
|
* Shared support code for kernels built with the DEBUG option.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: subr_debug.c,v 1.7 2008/04/30 20:20:53 ad Exp $");
|
|
|
|
#include "opt_ddb.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/debug.h>
|
|
#include <sys/atomic.h>
|
|
#include <sys/cpu.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
#include <machine/lock.h>
|
|
|
|
/*
|
|
* Allocation/free validation by pointer address. Introduces
|
|
* significant overhead and is not enabled by default. Patch
|
|
* `debug_freecheck' to 1 at boot time to enable.
|
|
*/
|
|
#define FREECHECK_BYTES (8*1024*1024)
|
|
|
|
typedef struct fcitem {
|
|
void *i_addr;
|
|
struct fcitem *i_next;
|
|
} fcitem_t;
|
|
|
|
fcitem_t *freecheck_free;
|
|
__cpu_simple_lock_t freecheck_lock;
|
|
u_int debug_freecheck;
|
|
|
|
void
|
|
debug_init(void)
|
|
{
|
|
size_t cnt;
|
|
fcitem_t *i;
|
|
|
|
__cpu_simple_lock_init(&freecheck_lock);
|
|
|
|
if (debug_freecheck) {
|
|
i = (fcitem_t *)uvm_km_alloc(kernel_map, FREECHECK_BYTES, 0,
|
|
UVM_KMF_WIRED);
|
|
if (i == NULL) {
|
|
printf("freecheck_init: unable to allocate memory");
|
|
return;
|
|
}
|
|
|
|
for (cnt = FREECHECK_BYTES / sizeof(*i); cnt != 0; cnt--) {
|
|
i->i_next = freecheck_free;
|
|
freecheck_free = i++;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
freecheck_out(void **head, void *addr)
|
|
{
|
|
fcitem_t *i;
|
|
int s;
|
|
|
|
if (!debug_freecheck)
|
|
return;
|
|
|
|
s = splvm();
|
|
__cpu_simple_lock(&freecheck_lock);
|
|
for (i = *head; i != NULL; i = i->i_next) {
|
|
if (i->i_addr != addr)
|
|
continue;
|
|
__cpu_simple_unlock(&freecheck_lock);
|
|
splx(s);
|
|
panic("freecheck_out: %p already out", addr);
|
|
}
|
|
if ((i = freecheck_free) != NULL) {
|
|
freecheck_free = i->i_next;
|
|
i->i_addr = addr;
|
|
i->i_next = *head;
|
|
*head = i;
|
|
}
|
|
__cpu_simple_unlock(&freecheck_lock);
|
|
splx(s);
|
|
|
|
if (i == NULL) {
|
|
if (atomic_swap_uint(&debug_freecheck, 1) == 0)
|
|
printf("freecheck_out: no more slots\n");
|
|
}
|
|
}
|
|
|
|
void
|
|
freecheck_in(void **head, void *addr)
|
|
{
|
|
fcitem_t *i;
|
|
void *pp;
|
|
int s;
|
|
|
|
if (!debug_freecheck)
|
|
return;
|
|
|
|
s = splvm();
|
|
__cpu_simple_lock(&freecheck_lock);
|
|
for (i = *head, pp = head; i != NULL; pp = &i->i_next, i = i->i_next) {
|
|
if (i->i_addr == addr) {
|
|
*(fcitem_t **)pp = i->i_next;
|
|
i->i_next = freecheck_free;
|
|
freecheck_free = i;
|
|
break;
|
|
}
|
|
}
|
|
__cpu_simple_unlock(&freecheck_lock);
|
|
splx(s);
|
|
|
|
if (i != NULL)
|
|
return;
|
|
|
|
#ifdef DDB
|
|
printf("freecheck_in: %p not out\n", addr);
|
|
Debugger();
|
|
#else
|
|
panic("freecheck_in: %p not out", addr);
|
|
#endif
|
|
}
|