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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 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 #include <dlfcn.h> 30 #include <sys/modctl.h> 31 #include <sys/kobj.h> 32 33 #include <kmdb/kmdb_module.h> 34 #include <mdb/mdb_debug.h> 35 #include <mdb/mdb_gelf.h> 36 #include <mdb/mdb_string.h> 37 #include <mdb/mdb.h> 38 39 /* 40 * kmdb libdl-style interface for the manipulation of dmods. 41 */ 42 43 static char *dl_errstr; 44 45 static kmdb_modctl_t * 46 dl_name2ctl(const char *pathname) 47 { 48 mdb_var_t *v; 49 50 if ((v = mdb_nv_lookup(&mdb.m_dmodctl, strbasename(pathname))) == 51 NULL) 52 return (NULL); 53 54 return ((kmdb_modctl_t *)MDB_NV_COOKIE(v)); 55 } 56 57 /*ARGSUSED*/ 58 void * 59 dlmopen(Lmid_t lmid, const char *pathname, int mode) 60 { 61 kmdb_modctl_t *kmc; 62 63 if ((kmc = dl_name2ctl(pathname)) == NULL) { 64 dl_errstr = "unregistered module"; 65 return (NULL); 66 } 67 68 kmc->kmc_dlrefcnt++; 69 70 dl_errstr = NULL; 71 72 return (kmc); 73 } 74 75 int 76 dlclose(void *dlp) 77 { 78 kmdb_modctl_t *kmc = dlp; 79 80 dl_errstr = NULL; 81 82 ASSERT(kmc->kmc_dlrefcnt > 0); 83 if (--kmc->kmc_dlrefcnt > 0) 84 return (0); 85 86 return (0); 87 } 88 89 char * 90 dlerror(void) 91 { 92 char *str = dl_errstr; 93 94 dl_errstr = NULL; 95 96 return (str); 97 } 98 99 static void * 100 dl_findsym(kmdb_modctl_t *kmc, const char *name) 101 { 102 GElf_Sym sym; 103 uint_t symid; 104 105 if (mdb_gelf_symtab_lookup_by_name(kmc->kmc_symtab, name, &sym, 106 &symid) < 0) 107 return (NULL); 108 109 return ((void *)(uintptr_t)sym.st_value); 110 } 111 112 /*ARGSUSED*/ 113 void * 114 dlsym(void *dlp, const char *name) 115 { 116 kmdb_modctl_t *kmc = dlp; 117 mdb_var_t *v; 118 void *addr; 119 120 switch ((uintptr_t)dlp) { 121 case (uintptr_t)RTLD_NEXT: 122 mdb_nv_rewind(&mdb.m_dmodctl); 123 while ((v = mdb_nv_advance(&mdb.m_dmodctl)) != NULL) { 124 if ((addr = dl_findsym(MDB_NV_COOKIE(v), name)) != NULL) 125 break; 126 } 127 break; 128 129 case (uintptr_t)RTLD_DEFAULT: 130 case (uintptr_t)RTLD_SELF: 131 dl_errstr = "invalid handle"; 132 return (NULL); 133 134 default: 135 addr = dl_findsym(kmc, name); 136 } 137 138 dl_errstr = (addr == NULL) ? "symbol not found" : NULL; 139 140 return (addr); 141 } 142 143 #pragma weak _dladdr1 = dladdr1 144 /*ARGSUSED*/ 145 int 146 dladdr1(void *address, Dl_info *dlip, void **info, int flags) 147 { 148 /* 149 * umem uses this for debugging information. We'll pretend to fail. 150 */ 151 152 return (0); 153 } 154