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