xref: /onnv-gate/usr/src/cmd/mdb/common/modules/libumem/misc.c (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate  * CDDL HEADER START
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*0Sstevel@tonic-gate  * with the License.
8*0Sstevel@tonic-gate  *
9*0Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate  * and limitations under the License.
13*0Sstevel@tonic-gate  *
14*0Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate  *
20*0Sstevel@tonic-gate  * CDDL HEADER END
21*0Sstevel@tonic-gate  */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24*0Sstevel@tonic-gate  * Use is subject to license terms.
25*0Sstevel@tonic-gate  */
26*0Sstevel@tonic-gate 
27*0Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*0Sstevel@tonic-gate 
29*0Sstevel@tonic-gate #include "misc.h"
30*0Sstevel@tonic-gate 
31*0Sstevel@tonic-gate #define	UMEM_OBJNAME "libumem.so"
32*0Sstevel@tonic-gate 
33*0Sstevel@tonic-gate int umem_debug_level = 0;
34*0Sstevel@tonic-gate int umem_is_standalone = 0;
35*0Sstevel@tonic-gate 
36*0Sstevel@tonic-gate /*ARGSUSED*/
37*0Sstevel@tonic-gate int
38*0Sstevel@tonic-gate umem_debug(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
39*0Sstevel@tonic-gate {
40*0Sstevel@tonic-gate 	umem_debug_level ^= 1;
41*0Sstevel@tonic-gate 
42*0Sstevel@tonic-gate 	mdb_printf("umem: debugging is now %s\n",
43*0Sstevel@tonic-gate 	    umem_debug_level ? "on" : "off");
44*0Sstevel@tonic-gate 
45*0Sstevel@tonic-gate 	return (DCMD_OK);
46*0Sstevel@tonic-gate }
47*0Sstevel@tonic-gate 
48*0Sstevel@tonic-gate void
49*0Sstevel@tonic-gate umem_set_standalone(void)
50*0Sstevel@tonic-gate {
51*0Sstevel@tonic-gate 	umem_is_standalone = 1;
52*0Sstevel@tonic-gate }
53*0Sstevel@tonic-gate 
54*0Sstevel@tonic-gate ssize_t
55*0Sstevel@tonic-gate umem_lookup_by_name(const char *name, GElf_Sym *sym)
56*0Sstevel@tonic-gate {
57*0Sstevel@tonic-gate 	return (mdb_lookup_by_obj((umem_is_standalone ? MDB_OBJ_EXEC :
58*0Sstevel@tonic-gate 	    UMEM_OBJNAME), name, sym));
59*0Sstevel@tonic-gate }
60*0Sstevel@tonic-gate 
61*0Sstevel@tonic-gate /* This is like mdb_readvar, only for libumem.so's symbols */
62*0Sstevel@tonic-gate ssize_t
63*0Sstevel@tonic-gate umem_readvar(void *buf, const char *name)
64*0Sstevel@tonic-gate {
65*0Sstevel@tonic-gate 	GElf_Sym sym;
66*0Sstevel@tonic-gate 
67*0Sstevel@tonic-gate 	if (umem_lookup_by_name(name, &sym))
68*0Sstevel@tonic-gate 		return (-1);
69*0Sstevel@tonic-gate 
70*0Sstevel@tonic-gate 	if (mdb_vread(buf, sym.st_size, (uintptr_t)sym.st_value)
71*0Sstevel@tonic-gate 	    == sym.st_size)
72*0Sstevel@tonic-gate 		return ((ssize_t)sym.st_size);
73*0Sstevel@tonic-gate 
74*0Sstevel@tonic-gate 	return (-1);
75*0Sstevel@tonic-gate }
76*0Sstevel@tonic-gate 
77*0Sstevel@tonic-gate int
78*0Sstevel@tonic-gate is_umem_sym(const char *sym, const char *prefix)
79*0Sstevel@tonic-gate {
80*0Sstevel@tonic-gate 	char *tick_p = strrchr(sym, '`');
81*0Sstevel@tonic-gate 
82*0Sstevel@tonic-gate 	return (strncmp(sym, "libumem", 7) == 0 && tick_p != NULL &&
83*0Sstevel@tonic-gate 		strncmp(tick_p + 1, prefix, strlen(prefix)) == 0);
84*0Sstevel@tonic-gate }
85