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 #ifdef A_OUT 57 #include "_a.out.h" 58 #endif /* A_OUT */ 59 60 /* VARARGS */ 61 unsigned long 62 _setup(Boot *ebp, Dyn *ld_dyn) 63 { 64 ulong_t reladdr, relacount, ld_base = 0; 65 ulong_t relaent = 0; 66 ulong_t strtab, soname, interp_base = 0; 67 char *_rt_name, **_envp, **_argv; 68 int _syspagsz = 0, fd = -1; 69 uint_t _flags = 0; 70 uint_t hwcap[2] = { 0, 0 }; 71 Dyn *dyn_ptr; 72 Phdr *phdr = NULL; 73 Rt_map *lmp; 74 auxv_t *auxv, *_auxv; 75 uid_t uid = (uid_t)-1, euid = (uid_t)-1; 76 gid_t gid = (gid_t)-1, egid = (gid_t)-1; 77 char *_platform = NULL, *_execname = NULL, *_emulator = NULL; 78 int auxflags = -1; 79 #ifdef A_OUT 80 void *aoutdyn = NULL; 81 #endif /* A_OUT */ 82 83 /* 84 * Scan the bootstrap structure to pick up the basics. 85 */ 86 for (; ebp->eb_tag != EB_NULL; ebp++) 87 switch (ebp->eb_tag) { 88 case EB_DYNAMIC: 89 #ifdef A_OUT 90 aoutdyn = (Link_dynamic *)ebp->eb_un.eb_val; 91 #endif /* A_OUT */ 92 break; 93 case EB_LDSO_BASE: 94 ld_base = (unsigned long)ebp->eb_un.eb_val; 95 break; 96 case EB_ARGV: 97 _argv = (char **)ebp->eb_un.eb_ptr; 98 break; 99 case EB_ENVP: 100 _envp = (char **)ebp->eb_un.eb_ptr; 101 break; 102 case EB_AUXV: 103 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 104 break; 105 case EB_PAGESIZE: 106 _syspagsz = (int)ebp->eb_un.eb_val; 107 break; 108 } 109 110 /* 111 * Search the aux. vector for the information passed by exec. 112 */ 113 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 114 switch (auxv->a_type) { 115 case AT_EXECFD: 116 /* this is the old exec that passes a file descriptor */ 117 fd = (int)auxv->a_un.a_val; 118 break; 119 case AT_FLAGS: 120 /* processor flags (MAU available, etc) */ 121 _flags = auxv->a_un.a_val; 122 break; 123 case AT_PAGESZ: 124 /* system page size */ 125 _syspagsz = (int)auxv->a_un.a_val; 126 break; 127 case AT_PHDR: 128 /* address of the segment table */ 129 phdr = (Phdr *)auxv->a_un.a_ptr; 130 break; 131 case AT_BASE: 132 /* interpreter base address */ 133 if (ld_base == 0) 134 ld_base = auxv->a_un.a_val; 135 interp_base = auxv->a_un.a_val; 136 break; 137 case AT_SUN_UID: 138 /* effective user id for the executable */ 139 euid = (uid_t)auxv->a_un.a_val; 140 break; 141 case AT_SUN_RUID: 142 /* real user id for the executable */ 143 uid = (uid_t)auxv->a_un.a_val; 144 break; 145 case AT_SUN_GID: 146 /* effective group id for the executable */ 147 egid = (gid_t)auxv->a_un.a_val; 148 break; 149 case AT_SUN_RGID: 150 /* real group id for the executable */ 151 gid = (gid_t)auxv->a_un.a_val; 152 break; 153 case AT_SUN_PLATFORM: 154 /* platform name */ 155 _platform = auxv->a_un.a_ptr; 156 break; 157 case AT_SUN_EXECNAME: 158 /* full pathname of execed object */ 159 _execname = auxv->a_un.a_ptr; 160 break; 161 case AT_SUN_AUXFLAGS: 162 /* auxiliary flags */ 163 auxflags = (int)auxv->a_un.a_val; 164 break; 165 case AT_SUN_HWCAP: 166 /* hardware capabilities */ 167 hwcap[0] = (uint_t)auxv->a_un.a_val; 168 break; 169 case AT_SUN_HWCAP2: 170 /* hardware capabilities */ 171 hwcap[1] = (uint_t)auxv->a_un.a_val; 172 break; 173 case AT_SUN_EMULATOR: 174 /* name of emulation library, if any */ 175 _emulator = auxv->a_un.a_ptr; 176 break; 177 } 178 } 179 180 /* 181 * Get needed info from ld.so's dynamic structure. 182 */ 183 /* LINTED */ 184 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 185 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 186 switch (ld_dyn->d_tag) { 187 case DT_RELA: 188 reladdr = ld_dyn->d_un.d_ptr + ld_base; 189 break; 190 case DT_RELACOUNT: 191 relacount = ld_dyn->d_un.d_val; 192 break; 193 case DT_RELAENT: 194 relaent = ld_dyn->d_un.d_val; 195 break; 196 case DT_STRTAB: 197 strtab = ld_dyn->d_un.d_ptr + ld_base; 198 break; 199 case DT_SONAME: 200 soname = ld_dyn->d_un.d_val; 201 break; 202 } 203 } 204 _rt_name = (char *)strtab + soname; 205 206 /* 207 * If we don't have a RELAENT, just assume the size. 208 */ 209 if (relaent == 0) 210 relaent = sizeof (Rela); 211 212 /* 213 * As all global symbol references within ld.so.1 are protected 214 * (symbolic), only RELATIVE and JMPSLOT relocations should be left 215 * to process at runtime. Process all relative relocations now. 216 */ 217 for (; relacount; relacount--) { 218 ulong_t roffset; 219 220 roffset = ((Rela *)reladdr)->r_offset + ld_base; 221 *((ulong_t *)roffset) = ld_base + 222 ((Rela *)reladdr)->r_addend; 223 reladdr += relaent; 224 } 225 226 /* 227 * If an emulation library is being used, use that as the linker's 228 * effective executable name. The real executable is not linked by this 229 * linker. 230 */ 231 if (_emulator != NULL) { 232 _execname = _emulator; 233 rtld_flags2 |= RT_FL2_BRANDED; 234 } 235 236 /* 237 * Continue with generic startup processing. 238 */ 239 /* BEGIN CSTYLED */ 240 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 241 _syspagsz, _rt_name, ld_base, interp_base, fd, phdr, 242 _execname, _argv, uid, euid, gid, egid, 243 #ifdef A_OUT 244 aoutdyn, auxflags, hwcap)) == NULL) { 245 #else 246 /* CSTYLED */ 247 NULL, auxflags, hwcap)) == NULL) { 248 #endif /* A_OUT */ 249 rtldexit(&lml_main, 1); 250 } 251 /* END CSTYLED */ 252 253 return (LM_ENTRY_PT(lmp)()); 254 } 255