_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 * SPARCV9-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 <sys/auxv.h> 46#include <sys/types.h> 47#include <sys/stat.h> 48#include <link.h> 49#include <dlfcn.h> 50#include "_rtld.h" 51#include "_audit.h" 52#include "msg.h" 53 54extern int _end; 55extern int _etext; 56extern void _init(void); 57 58 59/* VARARGS */ 60unsigned long 61_setup(Boot *ebp, Dyn *ld_dyn) 62{ 63 unsigned long reladdr, relacount, ld_base = 0; 64 unsigned long relaent = 0; 65 unsigned long strtab, soname, interp_base = 0; 66 char *_rt_name, **_envp, **_argv; 67 int _syspagsz = 0, fd = -1, dz_fd = FD_UNAVAIL; 68 uint_t _flags = 0, hwcap_1 = 0; 69 Dyn *dyn_ptr; 70 Phdr *phdr = 0; 71 Rt_map *lmp; 72 auxv_t *auxv, *_auxv; 73 uid_t uid = (uid_t)-1, euid = (uid_t)-1; 74 gid_t gid = (gid_t)-1, egid = (gid_t)-1; 75 char *_platform = 0, *_execname = 0; 76 int auxflags = -1; 77 78 /* 79 * Scan the bootstrap structure to pick up the basics. 80 */ 81 for (; ebp->eb_tag != EB_NULL; ebp++) 82 switch (ebp->eb_tag) { 83 case EB_LDSO_BASE: 84 ld_base = (unsigned long)ebp->eb_un.eb_val; 85 break; 86 case EB_ARGV: 87 _argv = (char **)ebp->eb_un.eb_ptr; 88 break; 89 case EB_ENVP: 90 _envp = (char **)ebp->eb_un.eb_ptr; 91 break; 92 case EB_AUXV: 93 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 94 break; 95 case EB_DEVZERO: 96 /* LINTED */ 97 dz_fd = (int)ebp->eb_un.eb_val; 98 break; 99 case EB_PAGESIZE: 100 /* LINTED */ 101 _syspagsz = (int)ebp->eb_un.eb_val; 102 break; 103 } 104 105 /* 106 * Search the aux. vector for the information passed by exec. 107 */ 108 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 109 switch (auxv->a_type) { 110 case AT_EXECFD: 111 /* this is the old exec that passes a file descriptor */ 112 /* LINTED */ 113 fd = (int)auxv->a_un.a_val; 114 break; 115 case AT_FLAGS: 116 /* processor flags (MAU available, etc) */ 117 /* LINTED */ 118 _flags = (Word)auxv->a_un.a_val; 119 break; 120 case AT_PAGESZ: 121 /* system page size */ 122 /* LINTED */ 123 _syspagsz = (int)auxv->a_un.a_val; 124 break; 125 case AT_PHDR: 126 /* address of the segment table */ 127 phdr = (Phdr *)auxv->a_un.a_ptr; 128 break; 129 case AT_BASE: 130 /* interpreter base address */ 131 if (ld_base == 0) 132 ld_base = auxv->a_un.a_val; 133 interp_base = auxv->a_un.a_val; 134 break; 135 case AT_SUN_UID: 136 /* effective user id for the executable */ 137 /* LINTED */ 138 euid = (uid_t)auxv->a_un.a_val; 139 break; 140 case AT_SUN_RUID: 141 /* real user id for the executable */ 142 /* LINTED */ 143 uid = (uid_t)auxv->a_un.a_val; 144 break; 145 case AT_SUN_GID: 146 /* effective group id for the executable */ 147 /* LINTED */ 148 egid = (gid_t)auxv->a_un.a_val; 149 break; 150 case AT_SUN_RGID: 151 /* real group id for the executable */ 152 /* LINTED */ 153 gid = (gid_t)auxv->a_un.a_val; 154 break; 155#ifdef AT_SUN_PLATFORM /* Defined on SunOS 5.5 & greater. */ 156 case AT_SUN_PLATFORM: 157 /* platform name */ 158 _platform = auxv->a_un.a_ptr; 159 break; 160#endif 161#ifdef AT_SUN_EXECNAME /* Defined on SunOS 5.6 & greater. */ 162 case AT_SUN_EXECNAME: 163 /* full pathname of execed object */ 164 _execname = auxv->a_un.a_ptr; 165 break; 166#endif 167#ifdef AT_SUN_AUXFLAGS /* At the behest of PSARC 2002/188 */ 168 case AT_SUN_AUXFLAGS: 169 auxflags = (int)auxv->a_un.a_val; 170 break; 171#endif 172#ifdef AT_SUN_HWCAP /* Hardware capabilities */ 173 case AT_SUN_HWCAP: 174 hwcap_1 = (uint_t)auxv->a_un.a_val; 175 break; 176#endif 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 208 * the size. 209 */ 210 if (relaent == 0) 211 relaent = sizeof (Rela); 212 213 /* 214 * Because ld.so.1 is built with -Bsymbolic there should only be 215 * RELATIVE and JMPSLOT relocations. Process all relatives first. 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 * Continue with generic startup processing. 228 */ 229 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 230 _syspagsz, _rt_name, dyn_ptr, ld_base, interp_base, fd, phdr, 231 _execname, _argv, dz_fd, uid, euid, gid, egid, NULL, auxflags, 232 hwcap_1)) == NULL) { 233 rtldexit(&lml_main, 1); 234 } 235 236 return (LM_ENTRY_PT(lmp)()); 237} 238