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 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 33 */ 34 35 /* 36 * SPARC specific setup routine - relocate ld.so's symbols, setup its 37 * environment, map in loadable sections of the executable. 38 * 39 * Takes base address ld.so was loaded at, address of ld.so's dynamic 40 * structure, address of process environment pointers, address of auxiliary 41 * vector and * argv[0] (process name). 42 * If errors occur, send process signal - otherwise 43 * return executable's entry point to the bootstrap routine. 44 */ 45 46 #include <signal.h> 47 #include <stdlib.h> 48 #include <sys/auxv.h> 49 #include <sys/types.h> 50 #include <sys/stat.h> 51 #include <link.h> 52 #include <dlfcn.h> 53 #include "_rtld.h" 54 #include "_audit.h" 55 #include "msg.h" 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; 67 uint_t hwcap[2] = { 0, 0 }; 68 Dyn *dyn_ptr; 69 Phdr *phdr = NULL; 70 Rt_map *lmp; 71 auxv_t *auxv, *_auxv; 72 uid_t uid = (uid_t)-1, euid = (uid_t)-1; 73 gid_t gid = (gid_t)-1, egid = (gid_t)-1; 74 char *_platform = NULL, *_execname = NULL, *_emulator = NULL; 75 int auxflags = -1; 76 77 /* 78 * Scan the bootstrap structure to pick up the basics. 79 */ 80 for (; ebp->eb_tag != EB_NULL; ebp++) 81 switch (ebp->eb_tag) { 82 case EB_DYNAMIC: 83 break; 84 case EB_LDSO_BASE: 85 ld_base = (unsigned long)ebp->eb_un.eb_val; 86 break; 87 case EB_ARGV: 88 _argv = (char **)ebp->eb_un.eb_ptr; 89 break; 90 case EB_ENVP: 91 _envp = (char **)ebp->eb_un.eb_ptr; 92 break; 93 case EB_AUXV: 94 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 95 break; 96 case EB_PAGESIZE: 97 _syspagsz = (int)ebp->eb_un.eb_val; 98 break; 99 } 100 101 /* 102 * Search the aux. vector for the information passed by exec. 103 */ 104 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 105 switch (auxv->a_type) { 106 case AT_EXECFD: 107 /* this is the old exec that passes a file descriptor */ 108 fd = (int)auxv->a_un.a_val; 109 break; 110 case AT_FLAGS: 111 /* processor flags (MAU available, etc) */ 112 _flags = auxv->a_un.a_val; 113 break; 114 case AT_PAGESZ: 115 /* system page size */ 116 _syspagsz = (int)auxv->a_un.a_val; 117 break; 118 case AT_PHDR: 119 /* address of the segment table */ 120 phdr = (Phdr *)auxv->a_un.a_ptr; 121 break; 122 case AT_BASE: 123 /* interpreter base address */ 124 if (ld_base == 0) 125 ld_base = auxv->a_un.a_val; 126 interp_base = auxv->a_un.a_val; 127 break; 128 case AT_SUN_UID: 129 /* effective user id for the executable */ 130 euid = (uid_t)auxv->a_un.a_val; 131 break; 132 case AT_SUN_RUID: 133 /* real user id for the executable */ 134 uid = (uid_t)auxv->a_un.a_val; 135 break; 136 case AT_SUN_GID: 137 /* effective group id for the executable */ 138 egid = (gid_t)auxv->a_un.a_val; 139 break; 140 case AT_SUN_RGID: 141 /* real group id for the executable */ 142 gid = (gid_t)auxv->a_un.a_val; 143 break; 144 case AT_SUN_PLATFORM: 145 /* platform name */ 146 _platform = auxv->a_un.a_ptr; 147 break; 148 case AT_SUN_EXECNAME: 149 /* full pathname of execed object */ 150 _execname = auxv->a_un.a_ptr; 151 break; 152 case AT_SUN_AUXFLAGS: 153 /* auxiliary flags */ 154 auxflags = (int)auxv->a_un.a_val; 155 break; 156 case AT_SUN_HWCAP: 157 /* hardware capabilities */ 158 hwcap[0] = (uint_t)auxv->a_un.a_val; 159 break; 160 case AT_SUN_HWCAP2: 161 /* hardware capabilities */ 162 hwcap[1] = (uint_t)auxv->a_un.a_val; 163 break; 164 case AT_SUN_EMULATOR: 165 /* name of emulation library, if any */ 166 _emulator = auxv->a_un.a_ptr; 167 break; 168 } 169 } 170 171 /* 172 * Get needed info from ld.so's dynamic structure. 173 */ 174 /* LINTED */ 175 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 176 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 177 switch (ld_dyn->d_tag) { 178 case DT_RELA: 179 reladdr = ld_dyn->d_un.d_ptr + ld_base; 180 break; 181 case DT_RELACOUNT: 182 relacount = ld_dyn->d_un.d_val; 183 break; 184 case DT_RELAENT: 185 relaent = ld_dyn->d_un.d_val; 186 break; 187 case DT_STRTAB: 188 strtab = ld_dyn->d_un.d_ptr + ld_base; 189 break; 190 case DT_SONAME: 191 soname = ld_dyn->d_un.d_val; 192 break; 193 } 194 } 195 _rt_name = (char *)strtab + soname; 196 197 /* 198 * If we don't have a RELAENT, just assume the size. 199 */ 200 if (relaent == 0) 201 relaent = sizeof (Rela); 202 203 /* 204 * As all global symbol references within ld.so.1 are protected 205 * (symbolic), only RELATIVE and JMPSLOT relocations should be left 206 * to process at runtime. Process all relative relocations now. 207 */ 208 for (; relacount; relacount--) { 209 ulong_t roffset; 210 211 roffset = ((Rela *)reladdr)->r_offset + ld_base; 212 *((ulong_t *)roffset) = ld_base + 213 ((Rela *)reladdr)->r_addend; 214 reladdr += relaent; 215 } 216 217 /* 218 * If an emulation library is being used, use that as the linker's 219 * effective executable name. The real executable is not linked by this 220 * linker. 221 */ 222 if (_emulator != NULL) { 223 _execname = _emulator; 224 rtld_flags2 |= RT_FL2_BRANDED; 225 } 226 227 /* 228 * Continue with generic startup processing. 229 */ 230 /* BEGIN CSTYLED */ 231 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 232 _syspagsz, _rt_name, ld_base, interp_base, fd, phdr, 233 _execname, _argv, uid, euid, gid, egid, 234 /* CSTYLED */ 235 NULL, auxflags, hwcap)) == NULL) { 236 rtldexit(&lml_main, 1); 237 } 238 /* END CSTYLED */ 239 240 return (LM_ENTRY_PT(lmp)()); 241 } 242