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 * Copyright (c) 2015, Joyent, Inc. 26 */ 27 28 /* 29 * libctf open/close interposition layer 30 * 31 * This interposition layer serves two purposes. First, it allows the 32 * introduction of a kmdb-specific implementation of ctf_open(). The normal 33 * ctf_open() call open(2)s a file, and reads the CTF data directly from it. 34 * No such facility is available in kmdb, as kmdb does not run in userland. We 35 * can, however, observe that kmdb uses this interface only to read CTF data 36 * from dmods. dmods, as viewed by kmdb, do have CTF data, but they have it 37 * in a form that is best accessed by ctf_bufopen(). This interposition layer 38 * allows us to translate ctf_open() calls into ctf_bufopen() calls. 39 * 40 * The second purpose of the interposition layer is to reduce the work needed 41 * to call mdb_ctf_bufopen. 42 */ 43 44 #include <sys/types.h> 45 #include <sys/kobj.h> 46 #include <libctf.h> 47 #include <ctf_impl.h> 48 49 #include <kmdb/kmdb_module.h> 50 #include <mdb/mdb_ctf.h> 51 #include <mdb/mdb_string.h> 52 #include <mdb/mdb_debug.h> 53 #include <mdb/mdb_err.h> 54 #include <mdb/mdb.h> 55 56 static kmdb_modctl_t * 57 mdb_ctf_name2ctl(const char *pathname) 58 { 59 mdb_var_t *v; 60 61 if ((v = mdb_nv_lookup(&mdb.m_dmodctl, strbasename(pathname))) == 62 NULL) 63 return (NULL); 64 65 return ((kmdb_modctl_t *)MDB_NV_COOKIE(v)); 66 } 67 68 ctf_file_t * 69 mdb_ctf_open(const char *pathname, int *errp) 70 { 71 struct module *mp; 72 kmdb_modctl_t *kmc; 73 ctf_file_t *ctfp; 74 75 if ((kmc = mdb_ctf_name2ctl(pathname)) == NULL) { 76 if (errp != NULL) 77 *errp = ENOENT; 78 return (NULL); 79 } 80 81 mp = kmc->kmc_modctl->mod_mp; 82 if (mp->ctfdata == NULL) { 83 if (errp != NULL) 84 *errp = ECTF_NOCTFDATA; 85 return (NULL); 86 } 87 88 if ((ctfp = mdb_ctf_bufopen(mp->ctfdata, mp->ctfsize, mp->symtbl, 89 mp->symhdr, mp->strings, mp->strhdr, errp)) == NULL) 90 return (NULL); 91 92 mdb_dprintf(MDB_DBG_MODULE, "loaded %lu bytes of CTF data for %s\n", 93 (ulong_t)mp->ctfsize, kmc->kmc_modname); 94 95 return (ctfp); 96 } 97 98 void 99 mdb_ctf_close(ctf_file_t *fp) 100 { 101 ctf_close(fp); 102 } 103 104 /*ARGSUSED*/ 105 int 106 mdb_ctf_write(const char *file, ctf_file_t *fp) 107 { 108 return (ENOTSUP); 109 } 110