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 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 1988 AT&T 29 * All Rights Reserved 30 */ 31 32 /* 33 * SPARC specific setup routine - relocate ld.so's symbols, setup its 34 * environment, map in loadable sections of the executable. 35 * 36 * Takes base address ld.so was loaded at, address of ld.so's dynamic 37 * structure, address of process environment pointers, address of auxiliary 38 * vector and * argv[0] (process name). 39 * If errors occur, send process signal - otherwise 40 * return executable's entry point to the bootstrap routine. 41 */ 42 43 #include <signal.h> 44 #include <stdlib.h> 45 #include <sys/auxv.h> 46 #include <sys/types.h> 47 #include <sys/stat.h> 48 #include <link.h> 49 #include <dlfcn.h> 50 #include "_rtld.h" 51 #include "_audit.h" 52 #include "msg.h" 53 #ifdef A_OUT 54 #include "_a.out.h" 55 #endif /* A_OUT */ 56 57 /* VARARGS */ 58 unsigned long 59 _setup(Boot *ebp, Dyn *ld_dyn) 60 { 61 ulong_t reladdr, relacount, ld_base = 0; 62 ulong_t relaent = 0; 63 ulong_t strtab, soname, interp_base = 0; 64 char *_rt_name, **_envp, **_argv; 65 int _syspagsz = 0, fd = -1; 66 uint_t _flags = 0, hwcap_1 = 0; 67 Dyn *dyn_ptr; 68 Phdr *phdr = NULL; 69 Rt_map *lmp; 70 auxv_t *auxv, *_auxv; 71 uid_t uid = (uid_t)-1, euid = (uid_t)-1; 72 gid_t gid = (gid_t)-1, egid = (gid_t)-1; 73 char *_platform = NULL, *_execname = NULL, *_emulator = NULL; 74 int auxflags = -1; 75 #ifdef A_OUT 76 void *aoutdyn = NULL; 77 #endif /* A_OUT */ 78 79 /* 80 * Scan the bootstrap structure to pick up the basics. 81 */ 82 for (; ebp->eb_tag != EB_NULL; ebp++) 83 switch (ebp->eb_tag) { 84 case EB_DYNAMIC: 85 #ifdef A_OUT 86 aoutdyn = (Link_dynamic *)ebp->eb_un.eb_val; 87 #endif /* A_OUT */ 88 break; 89 case EB_LDSO_BASE: 90 ld_base = (unsigned long)ebp->eb_un.eb_val; 91 break; 92 case EB_ARGV: 93 _argv = (char **)ebp->eb_un.eb_ptr; 94 break; 95 case EB_ENVP: 96 _envp = (char **)ebp->eb_un.eb_ptr; 97 break; 98 case EB_AUXV: 99 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 100 break; 101 case EB_PAGESIZE: 102 _syspagsz = (int)ebp->eb_un.eb_val; 103 break; 104 } 105 106 /* 107 * Search the aux. vector for the information passed by exec. 108 */ 109 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 110 switch (auxv->a_type) { 111 case AT_EXECFD: 112 /* this is the old exec that passes a file descriptor */ 113 fd = (int)auxv->a_un.a_val; 114 break; 115 case AT_FLAGS: 116 /* processor flags (MAU available, etc) */ 117 _flags = auxv->a_un.a_val; 118 break; 119 case AT_PAGESZ: 120 /* system page size */ 121 _syspagsz = (int)auxv->a_un.a_val; 122 break; 123 case AT_PHDR: 124 /* address of the segment table */ 125 phdr = (Phdr *)auxv->a_un.a_ptr; 126 break; 127 case AT_BASE: 128 /* interpreter base address */ 129 if (ld_base == 0) 130 ld_base = auxv->a_un.a_val; 131 interp_base = auxv->a_un.a_val; 132 break; 133 case AT_SUN_UID: 134 /* effective user id for the executable */ 135 euid = (uid_t)auxv->a_un.a_val; 136 break; 137 case AT_SUN_RUID: 138 /* real user id for the executable */ 139 uid = (uid_t)auxv->a_un.a_val; 140 break; 141 case AT_SUN_GID: 142 /* effective group id for the executable */ 143 egid = (gid_t)auxv->a_un.a_val; 144 break; 145 case AT_SUN_RGID: 146 /* real group id for the executable */ 147 gid = (gid_t)auxv->a_un.a_val; 148 break; 149 case AT_SUN_PLATFORM: 150 /* platform name */ 151 _platform = auxv->a_un.a_ptr; 152 break; 153 case AT_SUN_EXECNAME: 154 /* full pathname of execed object */ 155 _execname = auxv->a_un.a_ptr; 156 break; 157 case AT_SUN_AUXFLAGS: 158 /* auxiliary flags */ 159 auxflags = (int)auxv->a_un.a_val; 160 break; 161 case AT_SUN_HWCAP: 162 /* hardware capabilities */ 163 hwcap_1 = (uint_t)auxv->a_un.a_val; 164 break; 165 case AT_SUN_EMULATOR: 166 /* name of emulation library, if any */ 167 _emulator = auxv->a_un.a_ptr; 168 break; 169 } 170 } 171 172 /* 173 * Get needed info from ld.so's dynamic structure. 174 */ 175 /* LINTED */ 176 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 177 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 178 switch (ld_dyn->d_tag) { 179 case DT_RELA: 180 reladdr = ld_dyn->d_un.d_ptr + ld_base; 181 break; 182 case DT_RELACOUNT: 183 relacount = ld_dyn->d_un.d_val; 184 break; 185 case DT_RELAENT: 186 relaent = ld_dyn->d_un.d_val; 187 break; 188 case DT_STRTAB: 189 strtab = ld_dyn->d_un.d_ptr + ld_base; 190 break; 191 case DT_SONAME: 192 soname = ld_dyn->d_un.d_val; 193 break; 194 } 195 } 196 _rt_name = (char *)strtab + soname; 197 198 /* 199 * If we don't have a RELAENT, just assume the size. 200 */ 201 if (relaent == 0) 202 relaent = sizeof (Rela); 203 204 /* 205 * As all global symbol references within ld.so.1 are protected 206 * (symbolic), only RELATIVE and JMPSLOT relocations should be left 207 * to process at runtime. Process all relative relocations now. 208 */ 209 for (; relacount; relacount--) { 210 ulong_t roffset; 211 212 roffset = ((Rela *)reladdr)->r_offset + ld_base; 213 *((ulong_t *)roffset) = ld_base + 214 ((Rela *)reladdr)->r_addend; 215 reladdr += relaent; 216 } 217 218 /* 219 * If an emulation library is being used, use that as the linker's 220 * effective executable name. The real executable is not linked by this 221 * linker. 222 */ 223 if (_emulator != NULL) { 224 _execname = _emulator; 225 rtld_flags2 |= RT_FL2_BRANDED; 226 } 227 228 /* 229 * Continue with generic startup processing. 230 */ 231 /* BEGIN CSTYLED */ 232 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 233 _syspagsz, _rt_name, ld_base, interp_base, fd, phdr, 234 _execname, _argv, uid, euid, gid, egid, 235 #ifdef A_OUT 236 aoutdyn, auxflags, hwcap_1)) == NULL) { 237 #else 238 /* CSTYLED */ 239 NULL, auxflags, hwcap_1)) == NULL) { 240 #endif /* A_OUT */ 241 rtldexit(&lml_main, 1); 242 } 243 /* END CSTYLED */ 244 245 return (LM_ENTRY_PT(lmp)()); 246 } 247