_setup.c revision 4321:a8930ec16e52
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 (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29#pragma ident "%Z%%M% %I% %E% SMI" 30 31/* 32 * SPARC specific setup routine - relocate ld.so's symbols, setup its 33 * environment, map in loadable sections of the executable. 34 * 35 * Takes base address ld.so was loaded at, address of ld.so's dynamic 36 * structure, address of process environment pointers, address of auxiliary 37 * vector and * argv[0] (process name). 38 * If errors occur, send process signal - otherwise 39 * return executable's entry point to the bootstrap routine. 40 */ 41#include "_synonyms.h" 42 43#include <signal.h> 44#include <stdlib.h> 45#include <fcntl.h> 46#include <stdio.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#ifdef A_OUT 56#include "_a.out.h" 57#endif /* A_OUT */ 58 59extern int _end; 60extern int _etext; 61extern void _init(void); 62 63 64/* VARARGS */ 65unsigned long 66_setup(Boot * ebp, Dyn * ld_dyn) 67{ 68 unsigned long reladdr, relacount, ld_base = 0; 69 unsigned long relaent = 0; 70 unsigned long strtab, soname, interp_base = 0; 71 char *_rt_name, **_envp, **_argv; 72 int _syspagsz = 0, fd = -1, dz_fd = FD_UNAVAIL; 73 uint_t _flags = 0, hwcap_1 = 0; 74 Dyn * dyn_ptr; 75 Phdr * phdr = 0; 76 Rt_map * lmp; 77 auxv_t *auxv, *_auxv; 78 uid_t uid = (uid_t)-1, euid = (uid_t)-1; 79 gid_t gid = (gid_t)-1, egid = (gid_t)-1; 80 char *_platform = 0, *_execname = 0; 81 int auxflags = -1; 82#ifdef A_OUT 83 void * aoutdyn = 0; 84#endif /* A_OUT */ 85 86 /* 87 * Scan the bootstrap structure to pick up the basics. 88 */ 89 for (; ebp->eb_tag != EB_NULL; ebp++) 90 switch (ebp->eb_tag) { 91 case EB_DYNAMIC: 92#ifdef A_OUT 93 aoutdyn = (struct link_dynamic *)ebp->eb_un.eb_val; 94#endif /* A_OUT */ 95 break; 96 case EB_LDSO_BASE: 97 ld_base = (unsigned long)ebp->eb_un.eb_val; 98 break; 99 case EB_ARGV: 100 _argv = (char **)ebp->eb_un.eb_ptr; 101 break; 102 case EB_ENVP: 103 _envp = (char **)ebp->eb_un.eb_ptr; 104 break; 105 case EB_AUXV: 106 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 107 break; 108 case EB_DEVZERO: 109 dz_fd = (int)ebp->eb_un.eb_val; 110 break; 111 case EB_PAGESIZE: 112 _syspagsz = (int)ebp->eb_un.eb_val; 113 break; 114 } 115 116 /* 117 * Search the aux. vector for the information passed by exec. 118 */ 119 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 120 switch (auxv->a_type) { 121 case AT_EXECFD: 122 /* this is the old exec that passes a file descriptor */ 123 fd = (int)auxv->a_un.a_val; 124 break; 125 case AT_FLAGS: 126 /* processor flags (MAU available, etc) */ 127 _flags = auxv->a_un.a_val; 128 break; 129 case AT_PAGESZ: 130 /* system page size */ 131 _syspagsz = (int)auxv->a_un.a_val; 132 break; 133 case AT_PHDR: 134 /* address of the segment table */ 135 phdr = (Phdr *)auxv->a_un.a_ptr; 136 break; 137 case AT_BASE: 138 /* interpreter base address */ 139 if (ld_base == 0) 140 ld_base = auxv->a_un.a_val; 141 interp_base = auxv->a_un.a_val; 142 break; 143 case AT_SUN_UID: 144 /* effective user id for the executable */ 145 euid = (uid_t)auxv->a_un.a_val; 146 break; 147 case AT_SUN_RUID: 148 /* real user id for the executable */ 149 uid = (uid_t)auxv->a_un.a_val; 150 break; 151 case AT_SUN_GID: 152 /* effective group id for the executable */ 153 egid = (gid_t)auxv->a_un.a_val; 154 break; 155 case AT_SUN_RGID: 156 /* real group id for the executable */ 157 gid = (gid_t)auxv->a_un.a_val; 158 break; 159#ifdef AT_SUN_PLATFORM /* Defined on SunOS 5.5 & greater. */ 160 case AT_SUN_PLATFORM: 161 /* platform name */ 162 _platform = auxv->a_un.a_ptr; 163 break; 164#endif 165#ifdef AT_SUN_EXECNAME /* Defined on SunOS 5.6 & greater. */ 166 case AT_SUN_EXECNAME: 167 /* full pathname of execed object */ 168 _execname = auxv->a_un.a_ptr; 169 break; 170#endif 171#ifdef AT_SUN_AUXFLAGS /* At the behest of PSARC 2002/188 */ 172 case AT_SUN_AUXFLAGS: 173 auxflags = (int)auxv->a_un.a_val; 174 break; 175#endif 176#ifdef AT_SUN_HWCAP /* Hardware capabilities */ 177 case AT_SUN_HWCAP: 178 hwcap_1 = (uint_t)auxv->a_un.a_val; 179 break; 180#endif 181 } 182 } 183 184 /* 185 * Get needed info from ld.so's dynamic structure. 186 */ 187 /* LINTED */ 188 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 189 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 190 switch (ld_dyn->d_tag) { 191 case DT_RELA: 192 reladdr = ld_dyn->d_un.d_ptr + ld_base; 193 break; 194 case DT_RELACOUNT: 195 relacount = ld_dyn->d_un.d_val; 196 break; 197 case DT_RELAENT: 198 relaent = ld_dyn->d_un.d_val; 199 break; 200 case DT_STRTAB: 201 strtab = ld_dyn->d_un.d_ptr + ld_base; 202 break; 203 case DT_SONAME: 204 soname = ld_dyn->d_un.d_val; 205 break; 206 } 207 } 208 _rt_name = (char *)strtab + soname; 209 210 /* 211 * If we don't have a RELAENT, just assume 212 * the size. 213 */ 214 if (relaent == 0) 215 relaent = sizeof (Rela); 216 217 /* 218 * Because ld.so.1 is built with -Bsymbolic there should only be 219 * RELATIVE and JMPSLOT relocations. Process all relatives first. 220 */ 221 for (; relacount; relacount--) { 222 ulong_t roffset; 223 224 roffset = ((Rela *)reladdr)->r_offset + ld_base; 225 *((ulong_t *)roffset) = ld_base + 226 (long)(((Rela *)reladdr)->r_addend); 227 reladdr += relaent; 228 } 229 230 /* 231 * Continue with generic startup processing. 232 */ 233 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 234 _syspagsz, _rt_name, dyn_ptr, ld_base, interp_base, fd, phdr, 235 _execname, _argv, dz_fd, uid, euid, gid, egid, 236#ifdef A_OUT 237 aoutdyn, auxflags, hwcap_1)) == (Rt_map *)0) { 238#else 239 NULL, auxflags, hwcap_1)) == NULL) { 240#endif /* A_OUT */ 241 rtldexit(&lml_main, 1); 242 } 243 244 return (LM_ENTRY_PT(lmp)()); 245} 246