281 lines
6.3 KiB
C
281 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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 unmodified, 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 AUTHOR ``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 AUTHOR 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.
|
|
*/
|
|
|
|
/*
|
|
* uma_dbg.c Debugging features for UMA users
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/types.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/uma.h>
|
|
#include <vm/uma_int.h>
|
|
#include <vm/uma_dbg.h>
|
|
|
|
static const u_int32_t uma_junk = 0xdeadc0de;
|
|
|
|
/*
|
|
* Checks an item to make sure it hasn't been overwritten since freed.
|
|
*
|
|
* Complies with standard ctor arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_ctor(void *mem, int size, void *arg)
|
|
{
|
|
int cnt;
|
|
u_int32_t *p;
|
|
|
|
cnt = size / sizeof(uma_junk);
|
|
|
|
for (p = mem; cnt > 0; cnt--, p++)
|
|
if (*p != uma_junk)
|
|
panic("Memory modified after free %p(%d)\n",
|
|
mem, size);
|
|
}
|
|
|
|
/*
|
|
* Fills an item with predictable garbage
|
|
*
|
|
* Complies with standard dtor arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_dtor(void *mem, int size, void *arg)
|
|
{
|
|
int cnt;
|
|
u_int32_t *p;
|
|
|
|
cnt = size / sizeof(uma_junk);
|
|
|
|
for (p = mem; cnt > 0; cnt--, p++)
|
|
*p = uma_junk;
|
|
}
|
|
|
|
/*
|
|
* Fills an item with predictable garbage
|
|
*
|
|
* Complies with standard init arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_init(void *mem, int size)
|
|
{
|
|
trash_dtor(mem, size, NULL);
|
|
}
|
|
|
|
/*
|
|
* Checks an item to make sure it hasn't been overwritten since it was freed.
|
|
*
|
|
* Complies with standard fini arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_fini(void *mem, int size)
|
|
{
|
|
trash_ctor(mem, size, NULL);
|
|
}
|
|
|
|
/*
|
|
* Checks an item to make sure it hasn't been overwritten since freed.
|
|
*
|
|
* Complies with standard ctor arg/return
|
|
*
|
|
*/
|
|
void
|
|
mtrash_ctor(void *mem, int size, void *arg)
|
|
{
|
|
struct malloc_type **ksp;
|
|
u_int32_t *p = mem;
|
|
int cnt;
|
|
|
|
size -= sizeof(struct malloc_type *);
|
|
ksp = (struct malloc_type **)mem;
|
|
ksp += size / sizeof(struct malloc_type *);
|
|
cnt = size / sizeof(uma_junk);
|
|
|
|
for (p = mem; cnt > 0; cnt--, p++)
|
|
if (*p != uma_junk) {
|
|
printf("Memory modified after free %p(%d)\n",
|
|
mem, size);
|
|
panic("Most recently used by %s\n", (*ksp == NULL)?
|
|
"none" : (*ksp)->ks_shortdesc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fills an item with predictable garbage
|
|
*
|
|
* Complies with standard dtor arg/return
|
|
*
|
|
*/
|
|
void
|
|
mtrash_dtor(void *mem, int size, void *arg)
|
|
{
|
|
int cnt;
|
|
u_int32_t *p;
|
|
|
|
size -= sizeof(struct malloc_type *);
|
|
cnt = size / sizeof(uma_junk);
|
|
|
|
for (p = mem; cnt > 0; cnt--, p++)
|
|
*p = uma_junk;
|
|
}
|
|
|
|
/*
|
|
* Fills an item with predictable garbage
|
|
*
|
|
* Complies with standard init arg/return
|
|
*
|
|
*/
|
|
void
|
|
mtrash_init(void *mem, int size)
|
|
{
|
|
struct malloc_type **ksp;
|
|
|
|
mtrash_dtor(mem, size, NULL);
|
|
|
|
ksp = (struct malloc_type **)mem;
|
|
ksp += (size / sizeof(struct malloc_type *)) - 1;
|
|
*ksp = NULL;
|
|
}
|
|
|
|
/*
|
|
* Checks an item to make sure it hasn't been overwritten since it was freed.
|
|
*
|
|
* Complies with standard fini arg/return
|
|
*
|
|
*/
|
|
void
|
|
mtrash_fini(void *mem, int size)
|
|
{
|
|
mtrash_ctor(mem, size, NULL);
|
|
}
|
|
|
|
static uma_slab_t
|
|
uma_dbg_getslab(uma_zone_t zone, void *item)
|
|
{
|
|
uma_slab_t slab;
|
|
u_int8_t *mem;
|
|
|
|
mem = (u_int8_t *)((unsigned long)item & (~UMA_SLAB_MASK));
|
|
if (zone->uz_flags & UMA_ZFLAG_MALLOC) {
|
|
slab = vtoslab((vm_offset_t)mem);
|
|
} else if (zone->uz_flags & UMA_ZFLAG_HASH) {
|
|
slab = hash_sfind(&zone->uz_hash, mem);
|
|
} else {
|
|
mem += zone->uz_pgoff;
|
|
slab = (uma_slab_t)mem;
|
|
}
|
|
|
|
return (slab);
|
|
}
|
|
|
|
/*
|
|
* Set up the slab's freei data such that uma_dbg_free can function.
|
|
*
|
|
*/
|
|
|
|
void
|
|
uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item)
|
|
{
|
|
int freei;
|
|
|
|
if (slab == NULL) {
|
|
slab = uma_dbg_getslab(zone, item);
|
|
if (slab == NULL)
|
|
panic("uma: item %p did not belong to zone %s\n",
|
|
item, zone->uz_name);
|
|
}
|
|
|
|
freei = ((unsigned long)item - (unsigned long)slab->us_data)
|
|
/ zone->uz_rsize;
|
|
|
|
slab->us_freelist[freei] = 255;
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Verifies freed addresses. Checks for alignment, valid slab membership
|
|
* and duplicate frees.
|
|
*
|
|
*/
|
|
|
|
void
|
|
uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item)
|
|
{
|
|
int freei;
|
|
|
|
if (slab == NULL) {
|
|
slab = uma_dbg_getslab(zone, item);
|
|
if (slab == NULL)
|
|
panic("uma: Freed item %p did not belong to zone %s\n",
|
|
item, zone->uz_name);
|
|
}
|
|
|
|
freei = ((unsigned long)item - (unsigned long)slab->us_data)
|
|
/ zone->uz_rsize;
|
|
|
|
if (freei >= zone->uz_ipers)
|
|
panic("zone: %s(%p) slab %p freelist %d out of range 0-%d\n",
|
|
zone->uz_name, zone, slab, freei, zone->uz_ipers-1);
|
|
|
|
if (((freei * zone->uz_rsize) + slab->us_data) != item) {
|
|
printf("zone: %s(%p) slab %p freed address %p unaligned.\n",
|
|
zone->uz_name, zone, slab, item);
|
|
panic("should be %p\n",
|
|
(freei * zone->uz_rsize) + slab->us_data);
|
|
}
|
|
|
|
if (slab->us_freelist[freei] != 255) {
|
|
printf("Slab at %p, freei %d = %d.\n",
|
|
slab, freei, slab->us_freelist[freei]);
|
|
panic("Duplicate free of item %p from zone %p(%s)\n",
|
|
item, zone, zone->uz_name);
|
|
}
|
|
|
|
/*
|
|
* When this is actually linked into the slab this will change.
|
|
* Until then the count of valid slabs will make sure we don't
|
|
* accidentally follow this and assume it's a valid index.
|
|
*/
|
|
slab->us_freelist[freei] = 0;
|
|
}
|