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 * SPARCV9-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 <sys/auxv.h> 47 #include <sys/types.h> 48 #include <sys/stat.h> 49 #include <link.h> 50 #include <dlfcn.h> 51 #include "_rtld.h" 52 #include "_audit.h" 53 #include "msg.h" 54 #include "debug.h" 55 56 extern int _end; 57 extern int _etext; 58 extern void _init(void); 59 60 61 /* VARARGS */ 62 unsigned long 63 _setup(Boot *ebp, Dyn *ld_dyn) 64 { 65 unsigned long reladdr, relacount, ld_base = 0; 66 unsigned long relaent = 0; 67 unsigned long strtab, soname, interp_base = 0; 68 char *_rt_name, **_envp, **_argv; 69 int _syspagsz = 0, fd = -1, dz_fd = FD_UNAVAIL; 70 uint_t _flags = 0, hwcap_1 = 0; 71 Dyn *dyn_ptr; 72 Phdr *phdr = 0; 73 Rt_map *lmp; 74 auxv_t *auxv, *_auxv; 75 uid_t uid = -1, euid = -1; 76 gid_t gid = -1, egid = -1; 77 char *_platform = 0, *_execname = 0; 78 int auxflags = -1; 79 80 /* 81 * Scan the bootstrap structure to pick up the basics. 82 */ 83 for (; ebp->eb_tag != EB_NULL; ebp++) 84 switch (ebp->eb_tag) { 85 case EB_LDSO_BASE: 86 ld_base = (unsigned long)ebp->eb_un.eb_val; 87 break; 88 case EB_ARGV: 89 _argv = (char **)ebp->eb_un.eb_ptr; 90 break; 91 case EB_ENVP: 92 _envp = (char **)ebp->eb_un.eb_ptr; 93 break; 94 case EB_AUXV: 95 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 96 break; 97 case EB_DEVZERO: 98 /* LINTED */ 99 dz_fd = (int)ebp->eb_un.eb_val; 100 break; 101 case EB_PAGESIZE: 102 /* LINTED */ 103 _syspagsz = (int)ebp->eb_un.eb_val; 104 break; 105 } 106 107 /* 108 * Search the aux. vector for the information passed by exec. 109 */ 110 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 111 switch (auxv->a_type) { 112 case AT_EXECFD: 113 /* this is the old exec that passes a file descriptor */ 114 /* LINTED */ 115 fd = (int)auxv->a_un.a_val; 116 break; 117 case AT_FLAGS: 118 /* processor flags (MAU available, etc) */ 119 /* LINTED */ 120 _flags = (Word)auxv->a_un.a_val; 121 break; 122 case AT_PAGESZ: 123 /* system page size */ 124 /* LINTED */ 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 /* LINTED */ 140 euid = (uid_t)auxv->a_un.a_val; 141 break; 142 case AT_SUN_RUID: 143 /* real user id for the executable */ 144 /* LINTED */ 145 uid = (uid_t)auxv->a_un.a_val; 146 break; 147 case AT_SUN_GID: 148 /* effective group id for the executable */ 149 /* LINTED */ 150 egid = (gid_t)auxv->a_un.a_val; 151 break; 152 case AT_SUN_RGID: 153 /* real group id for the executable */ 154 /* LINTED */ 155 gid = (gid_t)auxv->a_un.a_val; 156 break; 157 #ifdef AT_SUN_PLATFORM /* Defined on SunOS 5.5 & greater. */ 158 case AT_SUN_PLATFORM: 159 /* platform name */ 160 _platform = auxv->a_un.a_ptr; 161 break; 162 #endif 163 #ifdef AT_SUN_EXECNAME /* Defined on SunOS 5.6 & greater. */ 164 case AT_SUN_EXECNAME: 165 /* full pathname of execed object */ 166 _execname = auxv->a_un.a_ptr; 167 break; 168 #endif 169 #ifdef AT_SUN_AUXFLAGS /* At the behest of PSARC 2002/188 */ 170 case AT_SUN_AUXFLAGS: 171 auxflags = (int)auxv->a_un.a_val; 172 break; 173 #endif 174 #ifdef AT_SUN_HWCAP /* Hardware capabilities */ 175 case AT_SUN_HWCAP: 176 hwcap_1 = (uint_t)auxv->a_un.a_val; 177 break; 178 #endif 179 } 180 } 181 182 /* 183 * Get needed info from ld.so's dynamic structure. 184 */ 185 /* LINTED */ 186 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 187 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 188 switch (ld_dyn->d_tag) { 189 case DT_RELA: 190 reladdr = ld_dyn->d_un.d_ptr + ld_base; 191 break; 192 case DT_RELACOUNT: 193 relacount = ld_dyn->d_un.d_val; 194 break; 195 case DT_RELAENT: 196 relaent = ld_dyn->d_un.d_val; 197 break; 198 case DT_STRTAB: 199 strtab = ld_dyn->d_un.d_ptr + ld_base; 200 break; 201 case DT_SONAME: 202 soname = ld_dyn->d_un.d_val; 203 break; 204 } 205 } 206 _rt_name = (char *)strtab + soname; 207 208 /* 209 * If we don't have a RELAENT, just assume 210 * the size. 211 */ 212 if (relaent == 0) 213 relaent = sizeof (Rela); 214 215 /* 216 * Because ld.so.1 is built with -Bsymbolic there should only be 217 * RELATIVE and JMPSLOT relocations. Process all relatives first. 218 */ 219 for (; relacount; relacount--) { 220 ulong_t roffset; 221 222 roffset = ((Rela *)reladdr)->r_offset + ld_base; 223 *((ulong_t *)roffset) = ld_base + 224 ((Rela *)reladdr)->r_addend; 225 reladdr += relaent; 226 } 227 228 /* 229 * Continue with generic startup processing. 230 */ 231 if ((lmp = setup((unsigned long)_envp, (unsigned long)_auxv, _flags, 232 _platform, _syspagsz, _rt_name, dyn_ptr, ld_base, interp_base, 233 fd, phdr, _execname, _argv, dz_fd, uid, euid, gid, egid, 234 NULL, auxflags, hwcap_1)) == NULL) { 235 rtldexit(&lml_main, 1); 236 } 237 238 return (LM_ENTRY_PT(lmp)()); 239 } 240