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 2006 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 <stdio.h> 30 #include <dlfcn.h> 31 #include <libelf.h> 32 #include <link.h> 33 #include <debug.h> 34 #include "msg.h" 35 #include "_libld.h" 36 37 /* 38 * Table which defines the default functions to be called by the library 39 * SUPPORT (-S <libname>). These functions can be redefined by the 40 * ld_support_loadso() routine. 41 */ 42 static Support_list support[LDS_NUM] = { 43 {MSG_ORIG(MSG_SUP_VERSION), { 0, 0 }}, /* LDS_VERSION */ 44 {MSG_ORIG(MSG_SUP_INPUT_DONE), { 0, 0 }}, /* LDS_INPUT_DONE */ 45 #if defined(_ELF64) 46 {MSG_ORIG(MSG_SUP_START_64), { 0, 0 }}, /* LDS_START64 */ 47 {MSG_ORIG(MSG_SUP_ATEXIT_64), { 0, 0 }}, /* LDS_ATEXIT64 */ 48 {MSG_ORIG(MSG_SUP_FILE_64), { 0, 0 }}, /* LDS_FILE64 */ 49 {MSG_ORIG(MSG_SUP_INP_SECTION_64), { 0, 0 }}, /* LDS_INP_SECTION64 */ 50 {MSG_ORIG(MSG_SUP_SECTION_64), { 0, 0 }} /* LDS_SECTION64 */ 51 #else /* Elf32 */ 52 {MSG_ORIG(MSG_SUP_START), { 0, 0 }}, /* LDS_START */ 53 {MSG_ORIG(MSG_SUP_ATEXIT), { 0, 0 }}, /* LDS_ATEXIT */ 54 {MSG_ORIG(MSG_SUP_FILE), { 0, 0 }}, /* LDS_FILE */ 55 {MSG_ORIG(MSG_SUP_INP_SECTION), { 0, 0 }}, /* LDS_INP_SECTION */ 56 {MSG_ORIG(MSG_SUP_SECTION), { 0, 0 }} /* LDS_SECTION */ 57 #endif 58 }; 59 60 /* 61 * Loads in a support shared object specified using the SGS_SUPPORT environment 62 * variable or the -S ld option, and determines which interface functions are 63 * provided by that object. 64 */ 65 uintptr_t 66 ld_sup_loadso(Ofl_desc *ofl, const char *obj) 67 { 68 void *handle; 69 void (*fptr)(); 70 Func_list *flp; 71 int i; 72 uint_t ver_level; 73 74 /* 75 * Load the required support library. If we are unable to load it fail 76 * with a fatal error. 77 */ 78 if ((handle = dlopen(obj, RTLD_LAZY)) == NULL) { 79 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_SUP_NOLOAD), 80 obj, dlerror()); 81 return (S_ERROR); 82 } 83 84 ver_level = LD_SUP_VERSION1; 85 for (i = 0; i < LDS_NUM; i++) { 86 if (fptr = (void (*)())dlsym(handle, support[i].sup_name)) { 87 88 if ((flp = libld_malloc(sizeof (Func_list))) == NULL) 89 return (S_ERROR); 90 91 flp->fl_obj = obj; 92 flp->fl_fptr = fptr; 93 DBG_CALL(Dbg_support_load(ofl->ofl_lml, obj, 94 support[i].sup_name)); 95 96 if (i == LDS_VERSION) { 97 DBG_CALL(Dbg_support_action(ofl->ofl_lml, 98 flp->fl_obj, support[LDS_VERSION].sup_name, 99 LDS_VERSION, 0)); 100 ver_level = ((uint_t(*)()) 101 flp->fl_fptr)(LD_SUP_VCURRENT); 102 if ((ver_level == LD_SUP_VNONE) || 103 (ver_level > LD_SUP_VCURRENT)) { 104 eprintf(ofl->ofl_lml, ERR_FATAL, 105 MSG_INTL(MSG_SUP_BADVERSION), 106 LD_SUP_VCURRENT, ver_level); 107 (void) dlclose(handle); 108 return (S_ERROR); 109 } 110 111 } 112 flp->fl_version = ver_level; 113 if (list_appendc(&support[i].sup_funcs, flp) == 0) 114 return (S_ERROR); 115 } 116 } 117 return (1); 118 } 119 120 /* 121 * Wrapper routines for the ld support library calls. 122 */ 123 void 124 ld_sup_start(Ofl_desc *ofl, const Half etype, const char *caller) 125 { 126 Func_list *flp; 127 Listnode *lnp; 128 129 for (LIST_TRAVERSE(&support[LDS_START].sup_funcs, lnp, flp)) { 130 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 131 support[LDS_START].sup_name, LDS_START, ofl->ofl_name)); 132 (*flp->fl_fptr)(ofl->ofl_name, etype, caller); 133 } 134 } 135 136 void 137 ld_sup_atexit(Ofl_desc *ofl, int ecode) 138 { 139 Func_list *flp; 140 Listnode *lnp; 141 142 for (LIST_TRAVERSE(&support[LDS_ATEXIT].sup_funcs, lnp, flp)) { 143 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 144 support[LDS_ATEXIT].sup_name, LDS_ATEXIT, 0)); 145 (*flp->fl_fptr)(ecode); 146 } 147 } 148 149 void 150 ld_sup_file(Ofl_desc *ofl, const char *ifile, const Elf_Kind ekind, int flags, 151 Elf *elf) 152 { 153 Func_list *flp; 154 Listnode *lnp; 155 156 for (LIST_TRAVERSE(&support[LDS_FILE].sup_funcs, lnp, flp)) { 157 int _flags = 0; 158 159 if (!(flags & FLG_IF_CMDLINE)) 160 _flags |= LD_SUP_DERIVED; 161 if (!(flags & FLG_IF_NEEDED)) 162 _flags |= LD_SUP_INHERITED; 163 if (flags & FLG_IF_EXTRACT) 164 _flags |= LD_SUP_EXTRACTED; 165 166 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 167 support[LDS_FILE].sup_name, LDS_FILE, ifile)); 168 (*flp->fl_fptr)(ifile, ekind, _flags, elf); 169 } 170 } 171 172 uintptr_t 173 ld_sup_input_section(Ofl_desc *ofl, Ifl_desc *ifl, const char *sname, 174 Shdr **oshdr, Word ndx, Elf_Scn *scn, Elf *elf) 175 { 176 Func_list *flp; 177 Listnode *lnp; 178 uint_t flags = 0; 179 Elf_Data *data = NULL; 180 Shdr *nshdr = *oshdr; 181 182 for (LIST_TRAVERSE(&support[LDS_INP_SECTION].sup_funcs, lnp, flp)) { 183 /* 184 * This interface was introduced in VERSION2 - so only call it 185 * for libraries reporting support for version 2 or above. 186 */ 187 if (flp->fl_version < LD_SUP_VERSION2) 188 continue; 189 if ((data == NULL) && 190 ((data = elf_getdata(scn, NULL)) == NULL)) { 191 eprintf(ofl->ofl_lml, ERR_ELF, 192 MSG_INTL(MSG_ELF_GETDATA), ifl->ifl_name); 193 ofl->ofl_flags |= FLG_OF_FATAL; 194 return (S_ERROR); 195 } 196 197 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 198 support[LDS_INP_SECTION].sup_name, LDS_INP_SECTION, sname)); 199 (*flp->fl_fptr)(sname, &nshdr, ndx, data, elf, &flags); 200 } 201 202 /* 203 * If the section header has been re-allocated (known to occur with 204 * libCCexcept.so), then diagnose the section header difference and 205 * return the new section header. 206 */ 207 if (nshdr != *oshdr) { 208 Dbg_shdr_modified(ofl->ofl_lml, ifl->ifl_ehdr->e_machine, 209 *oshdr, nshdr, sname); 210 *oshdr = nshdr; 211 } 212 return (0); 213 } 214 215 void 216 ld_sup_section(Ofl_desc *ofl, const char *scn, Shdr *shdr, Word ndx, 217 Elf_Data *data, Elf *elf) 218 { 219 Func_list *flp; 220 Listnode *lnp; 221 222 for (LIST_TRAVERSE(&support[LDS_SECTION].sup_funcs, lnp, flp)) { 223 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 224 support[LDS_SECTION].sup_name, LDS_SECTION, scn)); 225 (*flp->fl_fptr)(scn, shdr, ndx, data, elf); 226 } 227 } 228 229 void 230 ld_sup_input_done(Ofl_desc *ofl) 231 { 232 Func_list *flp; 233 Listnode *lnp; 234 uint_t flags = 0; 235 236 for (LIST_TRAVERSE(&support[LDS_INPUT_DONE].sup_funcs, lnp, flp)) { 237 /* 238 * This interface was introduced in VERSION2 - so only call it 239 * for libraries reporting support for version 2 or above. 240 */ 241 if (flp->fl_version < LD_SUP_VERSION2) 242 continue; 243 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 244 support[LDS_INPUT_DONE].sup_name, LDS_INPUT_DONE, 0)); 245 (*flp->fl_fptr)(&flags); 246 } 247 } 248