283 lines
6.3 KiB
C
283 lines
6.3 KiB
C
/*
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* Copyright (c) 2002, Jeffrey Roberson <jroberson@chesapeake.net>
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* All rights reserved.
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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 unmodified, this list of conditions, and the following
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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/*
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* uma_dbg.c Debugging features for UMA users
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*
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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/kernel.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <vm/uma_dbg.h>
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static const u_int32_t uma_junk = 0xdeadc0de;
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/*
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* Checks an item to make sure it hasn't been overwritten since freed.
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*
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* Complies with standard ctor arg/return
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*
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*/
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void
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trash_ctor(void *mem, int size, void *arg)
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{
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int cnt;
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u_int32_t *p;
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cnt = size / sizeof(uma_junk);
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for (p = mem; cnt > 0; cnt--, p++)
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if (*p != uma_junk)
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panic("Memory modified after free %p(%d)\n",
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mem, size);
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}
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/*
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* Fills an item with predictable garbage
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*
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* Complies with standard dtor arg/return
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*
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*/
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void
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trash_dtor(void *mem, int size, void *arg)
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{
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int cnt;
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u_int32_t *p;
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cnt = size / sizeof(uma_junk);
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for (p = mem; cnt > 0; cnt--, p++)
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*p = uma_junk;
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}
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/*
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* Fills an item with predictable garbage
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*
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* Complies with standard init arg/return
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*
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*/
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void
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trash_init(void *mem, int size)
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{
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trash_dtor(mem, size, NULL);
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}
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/*
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* Checks an item to make sure it hasn't been overwritten since it was freed.
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*
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* Complies with standard fini arg/return
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*
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*/
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void
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trash_fini(void *mem, int size)
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{
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trash_ctor(mem, size, NULL);
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}
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/*
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* Checks an item to make sure it hasn't been overwritten since freed.
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*
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* Complies with standard ctor arg/return
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*
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*/
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void
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mtrash_ctor(void *mem, int size, void *arg)
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{
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struct malloc_type **ksp;
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u_int32_t *p = mem;
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int cnt;
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size -= sizeof(struct malloc_type *);
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ksp = (struct malloc_type **)mem;
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ksp += size / sizeof(struct malloc_type *);
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cnt = size / sizeof(uma_junk);
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for (p = mem; cnt > 0; cnt--, p++)
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if (*p != uma_junk) {
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printf("Memory modified after free %p(%d)\n",
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mem, size);
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panic("Most recently used by %s\n", (*ksp == NULL)?
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"none" : (*ksp)->ks_shortdesc);
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}
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}
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/*
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* Fills an item with predictable garbage
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*
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* Complies with standard dtor arg/return
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*
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*/
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void
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mtrash_dtor(void *mem, int size, void *arg)
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{
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int cnt;
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u_int32_t *p;
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size -= sizeof(struct malloc_type *);
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cnt = size / sizeof(uma_junk);
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for (p = mem; cnt > 0; cnt--, p++)
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*p = uma_junk;
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}
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/*
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* Fills an item with predictable garbage
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*
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* Complies with standard init arg/return
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*
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*/
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void
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mtrash_init(void *mem, int size)
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{
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struct malloc_type **ksp;
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mtrash_dtor(mem, size, NULL);
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ksp = (struct malloc_type **)mem;
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ksp += (size / sizeof(struct malloc_type *)) - 1;
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*ksp = NULL;
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}
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/*
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* Checks an item to make sure it hasn't been overwritten since it was freed.
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*
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* Complies with standard fini arg/return
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*
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*/
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void
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mtrash_fini(void *mem, int size)
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{
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mtrash_ctor(mem, size, NULL);
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}
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static uma_slab_t
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uma_dbg_getslab(uma_zone_t zone, void *item)
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{
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uma_slab_t slab;
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u_int8_t *mem;
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mem = (u_int8_t *)((unsigned long)item & (~UMA_SLAB_MASK));
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if (zone->uz_flags & UMA_ZFLAG_MALLOC) {
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mtx_lock(&malloc_mtx);
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slab = hash_sfind(mallochash, mem);
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mtx_unlock(&malloc_mtx);
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} else if (zone->uz_flags & UMA_ZFLAG_OFFPAGE) {
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ZONE_LOCK(zone);
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slab = hash_sfind(&zone->uz_hash, mem);
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ZONE_UNLOCK(zone);
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} else {
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mem += zone->uz_pgoff;
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slab = (uma_slab_t)mem;
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}
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return (slab);
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}
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/*
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* Set up the slab's freei data such that uma_dbg_free can function.
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*
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*/
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void
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uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item)
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{
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int freei;
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if (slab == NULL) {
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slab = uma_dbg_getslab(zone, item);
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if (slab == NULL)
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panic("uma: item %p did not belong to zone %s\n",
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item, zone->uz_name);
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}
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freei = ((unsigned long)item - (unsigned long)slab->us_data)
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/ zone->uz_rsize;
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slab->us_freelist[freei] = 255;
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return;
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}
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/*
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* Verifies freed addresses. Checks for alignment, valid slab membership
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* and duplicate frees.
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*
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*/
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void
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uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item)
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{
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int freei;
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if (slab == NULL) {
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slab = uma_dbg_getslab(zone, item);
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if (slab == NULL)
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panic("uma: Freed item %p did not belong to zone %s\n",
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item, zone->uz_name);
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}
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freei = ((unsigned long)item - (unsigned long)slab->us_data)
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/ zone->uz_rsize;
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if (freei >= zone->uz_ipers)
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panic("zone: %s(%p) slab %p freelist %d out of range 0-%d\n",
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zone->uz_name, zone, slab, freei, zone->uz_ipers-1);
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if (((freei * zone->uz_rsize) + slab->us_data) != item) {
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printf("zone: %s(%p) slab %p freed address %p unaligned.\n",
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zone->uz_name, zone, slab, item);
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panic("should be %p\n",
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(freei * zone->uz_rsize) + slab->us_data);
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}
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if (slab->us_freelist[freei] != 255) {
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printf("Slab at %p, freei %d = %d.\n",
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slab, freei, slab->us_freelist[freei]);
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panic("Duplicate free of item %p from zone %p(%s)\n",
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item, zone, zone->uz_name);
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}
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/*
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* When this is actually linked into the slab this will change.
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* Until then the count of valid slabs will make sure we don't
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* accidentally follow this and assume it's a valid index.
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*/
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slab->us_freelist[freei] = 0;
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}
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