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 2008 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 #pragma ident "%Z%%M% %I% %E% SMI" 33 34 /* 35 * SPARCV9-specific setup routine - relocate ld.so's symbols, setup its 36 * environment, map in loadable sections of the executable. 37 * 38 * Takes base address ld.so was loaded at, address of ld.so's dynamic 39 * structure, address of process environment pointers, address of auxiliary 40 * vector and * argv[0] (process name). 41 * If errors occur, send process signal - otherwise 42 * return executable's entry point to the bootstrap routine. 43 */ 44 45 #include <signal.h> 46 #include <stdlib.h> 47 #include <sys/auxv.h> 48 #include <sys/types.h> 49 #include <sys/stat.h> 50 #include <link.h> 51 #include <dlfcn.h> 52 #include "_rtld.h" 53 #include "_audit.h" 54 #include "msg.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 = (uid_t)-1, euid = (uid_t)-1; 76 gid_t gid = (gid_t)-1, egid = (gid_t)-1; 77 char *_platform = 0, *_execname = 0, *_emulator = 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 #ifdef AT_SUN_EMULATOR /* Emulation library name */ 180 case AT_SUN_EMULATOR: 181 /* name of emulation library, if any */ 182 _emulator = auxv->a_un.a_ptr; 183 break; 184 #endif 185 } 186 } 187 188 /* 189 * Get needed info from ld.so's dynamic structure. 190 */ 191 /* LINTED */ 192 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 193 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 194 switch (ld_dyn->d_tag) { 195 case DT_RELA: 196 reladdr = ld_dyn->d_un.d_ptr + ld_base; 197 break; 198 case DT_RELACOUNT: 199 relacount = ld_dyn->d_un.d_val; 200 break; 201 case DT_RELAENT: 202 relaent = ld_dyn->d_un.d_val; 203 break; 204 case DT_STRTAB: 205 strtab = ld_dyn->d_un.d_ptr + ld_base; 206 break; 207 case DT_SONAME: 208 soname = ld_dyn->d_un.d_val; 209 break; 210 } 211 } 212 _rt_name = (char *)strtab + soname; 213 214 /* 215 * If we don't have a RELAENT, just assume 216 * the size. 217 */ 218 if (relaent == 0) 219 relaent = sizeof (Rela); 220 221 /* 222 * Because ld.so.1 is built with -Bsymbolic there should only be 223 * RELATIVE and JMPSLOT relocations. Process all relatives first. 224 */ 225 for (; relacount; relacount--) { 226 ulong_t roffset; 227 228 roffset = ((Rela *)reladdr)->r_offset + ld_base; 229 *((ulong_t *)roffset) = ld_base + 230 ((Rela *)reladdr)->r_addend; 231 reladdr += relaent; 232 } 233 234 /* 235 * If an emulation library is being used, use that as the linker's 236 * effective executable name. The real executable is not linked by this 237 * linker. 238 */ 239 if (_emulator != NULL) { 240 _execname = _emulator; 241 rtld_flags2 |= RT_FL2_BRANDED; 242 } 243 244 /* 245 * Continue with generic startup processing. 246 */ 247 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 248 _syspagsz, _rt_name, dyn_ptr, ld_base, interp_base, fd, phdr, 249 _execname, _argv, dz_fd, uid, euid, gid, egid, NULL, auxflags, 250 hwcap_1)) == NULL) { 251 rtldexit(&lml_main, 1); 252 } 253 254 return (LM_ENTRY_PT(lmp)()); 255 } 256