1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * libctf open/close interposition layer 31 * 32 * This interposition layer serves two purposes. First, it allows the 33 * introduction of a kmdb-specific implementation of ctf_open(). The normal 34 * ctf_open() call open(2)s a file, and reads the CTF data directly from it. 35 * No such facility is available in kmdb, as kmdb does not run in userland. We 36 * can, however, observe that kmdb uses this interface only to read CTF data 37 * from dmods. dmods, as viewed by kmdb, do have CTF data, but they have it 38 * in a form that is best accessed by ctf_bufopen(). This interposition layer 39 * allows us to translate ctf_open() calls into ctf_bufopen() calls. 40 * 41 * The second purpose of the interposition layer is to reduce the work needed 42 * to call mdb_ctf_bufopen. 43 */ 44 45 #include <sys/types.h> 46 #include <sys/kobj.h> 47 #include <libctf.h> 48 #include <ctf_impl.h> 49 50 #include <kmdb/kmdb_module.h> 51 #include <mdb/mdb_ctf.h> 52 #include <mdb/mdb_string.h> 53 #include <mdb/mdb_debug.h> 54 #include <mdb/mdb_err.h> 55 #include <mdb/mdb.h> 56 57 static kmdb_modctl_t * 58 mdb_ctf_name2ctl(const char *pathname) 59 { 60 mdb_var_t *v; 61 62 if ((v = mdb_nv_lookup(&mdb.m_dmodctl, strbasename(pathname))) == 63 NULL) 64 return (NULL); 65 66 return ((kmdb_modctl_t *)MDB_NV_COOKIE(v)); 67 } 68 69 ctf_file_t * 70 mdb_ctf_open(const char *pathname, int *errp) 71 { 72 struct module *mp; 73 kmdb_modctl_t *kmc; 74 ctf_file_t *ctfp; 75 76 if ((kmc = mdb_ctf_name2ctl(pathname)) == NULL) { 77 if (errp != NULL) 78 *errp = ENOENT; 79 return (NULL); 80 } 81 82 mp = kmc->kmc_modctl->mod_mp; 83 if (mp->ctfdata == NULL) { 84 if (errp != NULL) 85 *errp = ECTF_NOCTFDATA; 86 return (NULL); 87 } 88 89 if ((ctfp = mdb_ctf_bufopen(mp->ctfdata, mp->ctfsize, mp->symtbl, 90 mp->symhdr, mp->strings, mp->strhdr, errp)) == NULL) 91 return (NULL); 92 93 mdb_dprintf(MDB_DBG_MODULE, "loaded %lu bytes of CTF data for %s\n", 94 (ulong_t)mp->ctfsize, kmc->kmc_modname); 95 96 return (ctfp); 97 } 98 99 void 100 mdb_ctf_close(ctf_file_t *fp) 101 { 102 ctf_close(fp); 103 } 104