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 /* 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 #include <dlfcn.h> 31 #include <sys/modctl.h> 32 #include <sys/kobj.h> 33 34 #include <kmdb/kmdb_module.h> 35 #include <mdb/mdb_debug.h> 36 #include <mdb/mdb_gelf.h> 37 #include <mdb/mdb_string.h> 38 #include <mdb/mdb.h> 39 40 /* 41 * kmdb libdl-style interface for the manipulation of dmods. 42 */ 43 44 static char *dl_errstr; 45 46 static kmdb_modctl_t * 47 dl_name2ctl(const char *pathname) 48 { 49 mdb_var_t *v; 50 51 if ((v = mdb_nv_lookup(&mdb.m_dmodctl, strbasename(pathname))) == 52 NULL) 53 return (NULL); 54 55 return ((kmdb_modctl_t *)MDB_NV_COOKIE(v)); 56 } 57 58 /*ARGSUSED*/ 59 void * 60 dlmopen(Lmid_t lmid, const char *pathname, int mode) 61 { 62 kmdb_modctl_t *kmc; 63 64 if ((kmc = dl_name2ctl(pathname)) == NULL) { 65 dl_errstr = "unregistered module"; 66 return (NULL); 67 } 68 69 kmc->kmc_dlrefcnt++; 70 71 dl_errstr = NULL; 72 73 return (kmc); 74 } 75 76 int 77 dlclose(void *dlp) 78 { 79 kmdb_modctl_t *kmc = dlp; 80 81 dl_errstr = NULL; 82 83 ASSERT(kmc->kmc_dlrefcnt > 0); 84 if (--kmc->kmc_dlrefcnt > 0) 85 return (0); 86 87 return (0); 88 } 89 90 char * 91 dlerror(void) 92 { 93 char *str = dl_errstr; 94 95 dl_errstr = NULL; 96 97 return (str); 98 } 99 100 static void * 101 dl_findsym(kmdb_modctl_t *kmc, const char *name) 102 { 103 GElf_Sym sym; 104 uint_t symid; 105 106 if (mdb_gelf_symtab_lookup_by_name(kmc->kmc_symtab, name, &sym, 107 &symid) < 0) 108 return (NULL); 109 110 return ((void *)(uintptr_t)sym.st_value); 111 } 112 113 /*ARGSUSED*/ 114 void * 115 dlsym(void *dlp, const char *name) 116 { 117 kmdb_modctl_t *kmc = dlp; 118 mdb_var_t *v; 119 void *addr; 120 121 switch ((uintptr_t)dlp) { 122 case (uintptr_t)RTLD_NEXT: 123 mdb_nv_rewind(&mdb.m_dmodctl); 124 while ((v = mdb_nv_advance(&mdb.m_dmodctl)) != NULL) { 125 if ((addr = dl_findsym(MDB_NV_COOKIE(v), name)) != NULL) 126 break; 127 } 128 break; 129 130 case (uintptr_t)RTLD_DEFAULT: 131 case (uintptr_t)RTLD_SELF: 132 dl_errstr = "invalid handle"; 133 return (NULL); 134 135 default: 136 addr = dl_findsym(kmc, name); 137 } 138 139 dl_errstr = (addr == NULL) ? "symbol not found" : NULL; 140 141 return (addr); 142 } 143 144 #pragma weak dladdr1 = _dladdr1 145 /*ARGSUSED*/ 146 int 147 _dladdr1(void *address, Dl_info *dlip, void **info, int flags) 148 { 149 /* 150 * umem uses this for debugging information. We'll pretend to fail. 151 */ 152 153 return (0); 154 } 155