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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * 27 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 #pragma ident "%Z%%M% %I% %E% SMI" 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 #include "_synonyms.h" 43 44 #include <signal.h> 45 #include <stdlib.h> 46 #include <fcntl.h> 47 #include <stdio.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 #include "debug.h" 60 61 extern int _end; 62 extern int _etext; 63 extern void _init(void); 64 65 66 /* VARARGS */ 67 unsigned long 68 _setup(Boot * ebp, Dyn * ld_dyn) 69 { 70 unsigned long reladdr, relacount, ld_base = 0; 71 unsigned long relaent = 0; 72 unsigned long strtab, soname, interp_base = 0; 73 char *_rt_name, **_envp, **_argv; 74 int _syspagsz = 0, fd = -1, dz_fd = FD_UNAVAIL; 75 uint_t _flags = 0, hwcap_1 = 0; 76 Dyn * dyn_ptr; 77 Phdr * phdr = 0; 78 Rt_map * lmp; 79 auxv_t *auxv, *_auxv; 80 uid_t uid = -1, euid = -1; 81 gid_t gid = -1, egid = -1; 82 char *_platform = 0, *_execname = 0; 83 int auxflags = -1; 84 #ifdef A_OUT 85 void * aoutdyn = 0; 86 #endif /* A_OUT */ 87 88 /* 89 * Scan the bootstrap structure to pick up the basics. 90 */ 91 for (; ebp->eb_tag != EB_NULL; ebp++) 92 switch (ebp->eb_tag) { 93 case EB_DYNAMIC: 94 #ifdef A_OUT 95 aoutdyn = (struct link_dynamic *)ebp->eb_un.eb_val; 96 #endif /* A_OUT */ 97 break; 98 case EB_LDSO_BASE: 99 ld_base = (unsigned long)ebp->eb_un.eb_val; 100 break; 101 case EB_ARGV: 102 _argv = (char **)ebp->eb_un.eb_ptr; 103 break; 104 case EB_ENVP: 105 _envp = (char **)ebp->eb_un.eb_ptr; 106 break; 107 case EB_AUXV: 108 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 109 break; 110 case EB_DEVZERO: 111 dz_fd = (int)ebp->eb_un.eb_val; 112 break; 113 case EB_PAGESIZE: 114 _syspagsz = (int)ebp->eb_un.eb_val; 115 break; 116 } 117 118 /* 119 * Search the aux. vector for the information passed by exec. 120 */ 121 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 122 switch (auxv->a_type) { 123 case AT_EXECFD: 124 /* this is the old exec that passes a file descriptor */ 125 fd = (int)auxv->a_un.a_val; 126 break; 127 case AT_FLAGS: 128 /* processor flags (MAU available, etc) */ 129 _flags = auxv->a_un.a_val; 130 break; 131 case AT_PAGESZ: 132 /* system page size */ 133 _syspagsz = (int)auxv->a_un.a_val; 134 break; 135 case AT_PHDR: 136 /* address of the segment table */ 137 phdr = (Phdr *)auxv->a_un.a_ptr; 138 break; 139 case AT_BASE: 140 /* interpreter base address */ 141 if (ld_base == 0) 142 ld_base = auxv->a_un.a_val; 143 interp_base = auxv->a_un.a_val; 144 break; 145 case AT_SUN_UID: 146 /* effective user id for the executable */ 147 euid = (uid_t)auxv->a_un.a_val; 148 break; 149 case AT_SUN_RUID: 150 /* real user id for the executable */ 151 uid = (uid_t)auxv->a_un.a_val; 152 break; 153 case AT_SUN_GID: 154 /* effective group id for the executable */ 155 egid = (gid_t)auxv->a_un.a_val; 156 break; 157 case AT_SUN_RGID: 158 /* real group id for the executable */ 159 gid = (gid_t)auxv->a_un.a_val; 160 break; 161 #ifdef AT_SUN_PLATFORM /* Defined on SunOS 5.5 & greater. */ 162 case AT_SUN_PLATFORM: 163 /* platform name */ 164 _platform = auxv->a_un.a_ptr; 165 break; 166 #endif 167 #ifdef AT_SUN_EXECNAME /* Defined on SunOS 5.6 & greater. */ 168 case AT_SUN_EXECNAME: 169 /* full pathname of execed object */ 170 _execname = auxv->a_un.a_ptr; 171 break; 172 #endif 173 #ifdef AT_SUN_AUXFLAGS /* At the behest of PSARC 2002/188 */ 174 case AT_SUN_AUXFLAGS: 175 auxflags = (int)auxv->a_un.a_val; 176 break; 177 #endif 178 #ifdef AT_SUN_HWCAP /* Hardware capabilities */ 179 case AT_SUN_HWCAP: 180 hwcap_1 = (uint_t)auxv->a_un.a_val; 181 break; 182 #endif 183 } 184 } 185 186 /* 187 * Get needed info from ld.so's dynamic structure. 188 */ 189 /* LINTED */ 190 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 191 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 192 switch (ld_dyn->d_tag) { 193 case DT_RELA: 194 reladdr = ld_dyn->d_un.d_ptr + ld_base; 195 break; 196 case DT_RELACOUNT: 197 relacount = ld_dyn->d_un.d_val; 198 break; 199 case DT_RELAENT: 200 relaent = ld_dyn->d_un.d_val; 201 break; 202 case DT_STRTAB: 203 strtab = ld_dyn->d_un.d_ptr + ld_base; 204 break; 205 case DT_SONAME: 206 soname = ld_dyn->d_un.d_val; 207 break; 208 } 209 } 210 _rt_name = (char *)strtab + soname; 211 212 /* 213 * If we don't have a RELAENT, just assume 214 * the size. 215 */ 216 if (relaent == 0) 217 relaent = sizeof (Rela); 218 219 /* 220 * Because ld.so.1 is built with -Bsymbolic there should only be 221 * RELATIVE and JMPSLOT relocations. Process all relatives first. 222 */ 223 for (; relacount; relacount--) { 224 ulong_t roffset; 225 226 roffset = ((Rela *)reladdr)->r_offset + ld_base; 227 *((ulong_t *)roffset) = ld_base + 228 (long)(((Rela *)reladdr)->r_addend); 229 reladdr += relaent; 230 } 231 232 /* 233 * Continue with generic startup processing. 234 */ 235 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 236 _syspagsz, _rt_name, dyn_ptr, ld_base, interp_base, fd, phdr, 237 _execname, _argv, dz_fd, uid, euid, gid, egid, 238 #ifdef A_OUT 239 aoutdyn, auxflags, hwcap_1)) == (Rt_map *)0) { 240 #else 241 NULL, auxflags, hwcap_1)) == NULL) { 242 #endif /* A_OUT */ 243 rtldexit(&lml_main, 1); 244 } 245 246 return (LM_ENTRY_PT(lmp)()); 247 } 248