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_START */ 47 {MSG_ORIG(MSG_SUP_ATEXIT_64), { 0, 0 }}, /* LDS_ATEXIT */ 48 {MSG_ORIG(MSG_SUP_OPEN_64), { 0, 0 }}, /* LDS_OPEN */ 49 {MSG_ORIG(MSG_SUP_FILE_64), { 0, 0 }}, /* LDS_FILE */ 50 {MSG_ORIG(MSG_SUP_INSEC_64), { 0, 0 }}, /* LDS_INSEC */ 51 {MSG_ORIG(MSG_SUP_SEC_64), { 0, 0 }} /* LDS_SEC */ 52 #else /* Elf32 */ 53 {MSG_ORIG(MSG_SUP_START), { 0, 0 }}, /* LDS_START */ 54 {MSG_ORIG(MSG_SUP_ATEXIT), { 0, 0 }}, /* LDS_ATEXIT */ 55 {MSG_ORIG(MSG_SUP_OPEN), { 0, 0 }}, /* LDS_OPEN */ 56 {MSG_ORIG(MSG_SUP_FILE), { 0, 0 }}, /* LDS_FILE */ 57 {MSG_ORIG(MSG_SUP_INSEC), { 0, 0 }}, /* LDS_INSEC */ 58 {MSG_ORIG(MSG_SUP_SEC), { 0, 0 }} /* LDS_SEC */ 59 #endif 60 }; 61 62 /* 63 * Loads in a support shared object specified using the SGS_SUPPORT environment 64 * variable or the -S ld option, and determines which interface functions are 65 * provided by that object. 66 */ 67 uintptr_t 68 ld_sup_loadso(Ofl_desc *ofl, const char *obj) 69 { 70 void *handle, (*fptr)(); 71 Func_list *flp; 72 uint_t interface, version = LD_SUP_VERSION1; 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 | RTLD_FIRST))) == NULL) { 79 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_SUP_NOLOAD), 80 obj, dlerror()); 81 return (S_ERROR); 82 } 83 84 for (interface = 0; interface < LDS_NUM; interface++) { 85 if ((fptr = (void (*)())dlsym(handle, 86 support[interface].sup_name)) == NULL) 87 continue; 88 89 if ((flp = libld_malloc(sizeof (Func_list))) == NULL) 90 return (S_ERROR); 91 92 flp->fl_obj = obj; 93 flp->fl_fptr = fptr; 94 DBG_CALL(Dbg_support_load(ofl->ofl_lml, obj, 95 support[interface].sup_name)); 96 97 if (interface == LDS_VERSION) { 98 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 99 support[LDS_VERSION].sup_name, LDS_VERSION, 0)); 100 101 version = ((uint_t(*)())flp->fl_fptr)(LD_SUP_VCURRENT); 102 if ((version == LD_SUP_VNONE) || 103 (version > LD_SUP_VCURRENT)) { 104 eprintf(ofl->ofl_lml, ERR_FATAL, 105 MSG_INTL(MSG_SUP_BADVERSION), 106 LD_SUP_VCURRENT, version); 107 (void) dlclose(handle); 108 return (S_ERROR); 109 } 110 } 111 flp->fl_version = version; 112 if (list_appendc(&support[interface].sup_funcs, flp) == 0) 113 return (S_ERROR); 114 } 115 return (1); 116 } 117 118 /* 119 * Wrapper routines for the ld support library calls. 120 */ 121 void 122 ld_sup_start(Ofl_desc *ofl, const Half etype, const char *caller) 123 { 124 Func_list *flp; 125 Listnode *lnp; 126 127 for (LIST_TRAVERSE(&support[LDS_START].sup_funcs, lnp, flp)) { 128 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 129 support[LDS_START].sup_name, LDS_START, ofl->ofl_name)); 130 (*flp->fl_fptr)(ofl->ofl_name, etype, caller); 131 } 132 } 133 134 void 135 ld_sup_atexit(Ofl_desc *ofl, int ecode) 136 { 137 Func_list *flp; 138 Listnode *lnp; 139 140 for (LIST_TRAVERSE(&support[LDS_ATEXIT].sup_funcs, lnp, flp)) { 141 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 142 support[LDS_ATEXIT].sup_name, LDS_ATEXIT, 0)); 143 (*flp->fl_fptr)(ecode); 144 } 145 } 146 147 void 148 ld_sup_open(Ofl_desc *ofl, const char **opath, const char **ofile, int *ofd, 149 int flags, Elf **oelf, Elf *ref, size_t off, const Elf_Kind ekind) 150 { 151 Func_list *flp; 152 Listnode *lnp; 153 const char *npath = *opath; 154 const char *nfile = *ofile; 155 Elf *nelf = *oelf; 156 int nfd = *ofd; 157 158 for (LIST_TRAVERSE(&support[LDS_OPEN].sup_funcs, lnp, flp)) { 159 int _flags = 0; 160 161 /* 162 * This interface was introduced in VERSION3. Only call this 163 * function for libraries reporting support for version 3 or 164 * above. 165 */ 166 if (flp->fl_version < LD_SUP_VERSION3) 167 continue; 168 169 if (!(flags & FLG_IF_CMDLINE)) 170 _flags |= LD_SUP_DERIVED; 171 if (!(flags & FLG_IF_NEEDED)) 172 _flags |= LD_SUP_INHERITED; 173 if (flags & FLG_IF_EXTRACT) 174 _flags |= LD_SUP_EXTRACTED; 175 176 /* 177 * If the present object is an extracted archive member, make 178 * sure the archive offset is reset so that the caller can 179 * obtain an ELF descriptor to the same member (an elf_begin() 180 * moves the offset to the next member). 181 */ 182 if (flags & FLG_IF_EXTRACT) 183 (void) elf_rand(ref, off); 184 185 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 186 support[LDS_OPEN].sup_name, LDS_OPEN, *opath)); 187 (*flp->fl_fptr)(&npath, &nfile, &nfd, _flags, &nelf, ref, off, 188 ekind); 189 } 190 191 /* 192 * If the file descriptor, ELF descriptor, or file names have been 193 * modified, then diagnose the differences and return the new data. 194 * As a basic test, make sure the support library hasn't nulled out 195 * data ld(1) will try and dereference. 196 */ 197 if ((npath != *opath) || (nfd != *ofd) || (nelf != *oelf)) { 198 Dbg_file_modified(ofl->ofl_lml, flp->fl_obj, *opath, npath, 199 *ofd, nfd, *oelf, nelf); 200 if (npath) 201 *opath = npath; 202 if (nfile) 203 *ofile = nfile; 204 *ofd = nfd; 205 *oelf = nelf; 206 } 207 } 208 209 void 210 ld_sup_file(Ofl_desc *ofl, const char *ifile, const Elf_Kind ekind, int flags, 211 Elf *elf) 212 { 213 Func_list *flp; 214 Listnode *lnp; 215 216 for (LIST_TRAVERSE(&support[LDS_FILE].sup_funcs, lnp, flp)) { 217 int _flags = 0; 218 219 if (!(flags & FLG_IF_CMDLINE)) 220 _flags |= LD_SUP_DERIVED; 221 if (!(flags & FLG_IF_NEEDED)) 222 _flags |= LD_SUP_INHERITED; 223 if (flags & FLG_IF_EXTRACT) 224 _flags |= LD_SUP_EXTRACTED; 225 226 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 227 support[LDS_FILE].sup_name, LDS_FILE, ifile)); 228 (*flp->fl_fptr)(ifile, ekind, _flags, elf); 229 } 230 } 231 232 uintptr_t 233 ld_sup_input_section(Ofl_desc *ofl, Ifl_desc *ifl, const char *sname, 234 Shdr **oshdr, Word ndx, Elf_Scn *scn, Elf *elf) 235 { 236 Func_list *flp; 237 Listnode *lnp; 238 uint_t flags = 0; 239 Elf_Data *data = NULL; 240 Shdr *nshdr = *oshdr; 241 242 for (LIST_TRAVERSE(&support[LDS_INSEC].sup_funcs, lnp, flp)) { 243 /* 244 * This interface was introduced in VERSION2. Only call this 245 * function for libraries reporting support for version 2 or 246 * above. 247 */ 248 if (flp->fl_version < LD_SUP_VERSION2) 249 continue; 250 251 if ((data == NULL) && 252 ((data = elf_getdata(scn, NULL)) == NULL)) { 253 eprintf(ofl->ofl_lml, ERR_ELF, 254 MSG_INTL(MSG_ELF_GETDATA), ifl->ifl_name); 255 ofl->ofl_flags |= FLG_OF_FATAL; 256 return (S_ERROR); 257 } 258 259 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 260 support[LDS_INSEC].sup_name, LDS_INSEC, sname)); 261 (*flp->fl_fptr)(sname, &nshdr, ndx, data, elf, &flags); 262 } 263 264 /* 265 * If the section header has been re-allocated (known to occur with 266 * libCCexcept.so), then diagnose the section header difference and 267 * return the new section header. 268 */ 269 if (nshdr != *oshdr) { 270 Dbg_shdr_modified(ofl->ofl_lml, flp->fl_obj, 271 ifl->ifl_ehdr->e_machine, *oshdr, nshdr, sname); 272 *oshdr = nshdr; 273 } 274 return (0); 275 } 276 277 void 278 ld_sup_section(Ofl_desc *ofl, const char *scn, Shdr *shdr, Word ndx, 279 Elf_Data *data, Elf *elf) 280 { 281 Func_list *flp; 282 Listnode *lnp; 283 284 for (LIST_TRAVERSE(&support[LDS_SEC].sup_funcs, lnp, flp)) { 285 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 286 support[LDS_SEC].sup_name, LDS_SEC, scn)); 287 (*flp->fl_fptr)(scn, shdr, ndx, data, elf); 288 } 289 } 290 291 void 292 ld_sup_input_done(Ofl_desc *ofl) 293 { 294 Func_list *flp; 295 Listnode *lnp; 296 uint_t flags = 0; 297 298 for (LIST_TRAVERSE(&support[LDS_INPUT_DONE].sup_funcs, lnp, flp)) { 299 /* 300 * This interface was introduced in VERSION2. Only call this 301 * function for libraries reporting support for version 2 or 302 * above. 303 */ 304 if (flp->fl_version < LD_SUP_VERSION2) 305 continue; 306 307 DBG_CALL(Dbg_support_action(ofl->ofl_lml, flp->fl_obj, 308 support[LDS_INPUT_DONE].sup_name, LDS_INPUT_DONE, 0)); 309 (*flp->fl_fptr)(&flags); 310 } 311 } 312