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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include "misc.h"
#define UMEM_OBJNAME "libumem.so.1"
int umem_debug_level = 0;
int umem_is_standalone = 0;
/*ARGSUSED*/
int
umem_debug(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
umem_debug_level ^= 1;
mdb_printf("umem: debugging is now %s\n",
umem_debug_level ? "on" : "off");
return (DCMD_OK);
}
/*
* To further confuse the issue, this dmod can run against either
* libumem.so.1 *or* the libstandumem.so linked into kmdb(1). To figure
* out which one we are working against, we look up "umem_alloc" in both
* libumem.so and the executable.
*
* A further wrinkle is that libumem.so may not yet be loaded into the
* process' address space. That can lead to either the lookup failing, or
* being unable to read from the data segment. We treat either case as
* an error.
*/
int
umem_set_standalone(void)
{
GElf_Sym sym;
int ready;
if (mdb_lookup_by_obj(UMEM_OBJNAME, "umem_alloc", &sym) == 0)
umem_is_standalone = 0;
else if (mdb_lookup_by_obj(MDB_OBJ_EXEC, "umem_alloc", &sym) == 0)
umem_is_standalone = 1;
else
return (-1);
/*
* now that we know where things should be, make sure we can actually
* read things out.
*/
if (umem_readvar(&ready, "umem_ready") == -1)
return (-1);
return (0);
}
ssize_t
umem_lookup_by_name(const char *name, GElf_Sym *sym)
{
return (mdb_lookup_by_obj((umem_is_standalone ? MDB_OBJ_EXEC :
UMEM_OBJNAME), name, sym));
}
/* This is like mdb_readvar, only for libumem.so's symbols */
ssize_t
umem_readvar(void *buf, const char *name)
{
GElf_Sym sym;
if (umem_lookup_by_name(name, &sym))
return (-1);
if (mdb_vread(buf, sym.st_size, (uintptr_t)sym.st_value)
== sym.st_size)
return ((ssize_t)sym.st_size);
return (-1);
}
int
is_umem_sym(const char *sym, const char *prefix)
{
char *tick_p = strrchr(sym, '`');
return (strncmp(sym, "libumem", 7) == 0 && tick_p != NULL &&
strncmp(tick_p + 1, prefix, strlen(prefix)) == 0);
}
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