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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * amd64 specific setup routine - relocate ld.so's symbols, setup its 30 * environment, map in loadable sections of the executable. 31 * 32 * Takes base address ld.so was loaded at, address of ld.so's dynamic 33 * structure, address of process environment pointers, address of auxiliary 34 * vector and * argv[0] (process name). 35 * If errors occur, send process signal - otherwise 36 * return executable's entry point to the bootstrap routine. 37 */ 38 #include "_synonyms.h" 39 40 #include <signal.h> 41 #include <stdlib.h> 42 #include <sys/auxv.h> 43 #include <sys/types.h> 44 #include <sys/stat.h> 45 #include <link.h> 46 #include <dlfcn.h> 47 #include <debug.h> 48 #include "_rtld.h" 49 #include "_audit.h" 50 #include "msg.h" 51 52 extern int _end; 53 extern int _etext; 54 55 56 /* VARARGS */ 57 unsigned long 58 _setup(Boot * ebp, Dyn * ld_dyn) 59 { 60 unsigned long reladdr, relacount, ld_base = 0; 61 unsigned long relaent = 0, pltrelsz = 0; 62 unsigned long strtab, soname, interp_base = 0; 63 char *_rt_name, **_envp, **_argv; 64 int _syspagsz = 0, fd = -1, dz_fd = FD_UNAVAIL; 65 uint_t _flags = 0, hwcap_1 = 0; 66 Dyn * dyn_ptr; 67 Phdr * phdr = 0; 68 Rt_map * lmp; 69 auxv_t *auxv, *_auxv; 70 uid_t uid = -1, euid = -1; 71 gid_t gid = -1, egid = -1; 72 char *_platform = 0, *_execname = 0; 73 int auxflags = -1; 74 /* 75 * Scan the bootstrap structure to pick up the basics. 76 */ 77 for (; ebp->eb_tag != EB_NULL; ebp++) 78 switch (ebp->eb_tag) { 79 case EB_LDSO_BASE: 80 ld_base = (unsigned long)ebp->eb_un.eb_val; 81 break; 82 case EB_ARGV: 83 _argv = (char **)ebp->eb_un.eb_ptr; 84 break; 85 case EB_ENVP: 86 _envp = (char **)ebp->eb_un.eb_ptr; 87 break; 88 case EB_AUXV: 89 _auxv = (auxv_t *)ebp->eb_un.eb_ptr; 90 break; 91 case EB_DEVZERO: 92 dz_fd = (int)ebp->eb_un.eb_val; 93 break; 94 case EB_PAGESIZE: 95 _syspagsz = (int)ebp->eb_un.eb_val; 96 break; 97 } 98 99 /* 100 * Search the aux. vector for the information passed by exec. 101 */ 102 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { 103 switch (auxv->a_type) { 104 case AT_EXECFD: 105 /* this is the old exec that passes a file descriptor */ 106 fd = (int)auxv->a_un.a_val; 107 break; 108 case AT_FLAGS: 109 /* processor flags (MAU available, etc) */ 110 _flags = auxv->a_un.a_val; 111 break; 112 case AT_PAGESZ: 113 /* system page size */ 114 _syspagsz = (int)auxv->a_un.a_val; 115 break; 116 case AT_PHDR: 117 /* address of the segment table */ 118 phdr = (Phdr *)auxv->a_un.a_ptr; 119 break; 120 case AT_BASE: 121 /* interpreter base address */ 122 if (ld_base == 0) 123 ld_base = auxv->a_un.a_val; 124 interp_base = auxv->a_un.a_val; 125 break; 126 case AT_SUN_UID: 127 /* effective user id for the executable */ 128 euid = (uid_t)auxv->a_un.a_val; 129 break; 130 case AT_SUN_RUID: 131 /* real user id for the executable */ 132 uid = (uid_t)auxv->a_un.a_val; 133 break; 134 case AT_SUN_GID: 135 /* effective group id for the executable */ 136 egid = (gid_t)auxv->a_un.a_val; 137 break; 138 case AT_SUN_RGID: 139 /* real group id for the executable */ 140 gid = (gid_t)auxv->a_un.a_val; 141 break; 142 case AT_SUN_PLATFORM: 143 /* platform name */ 144 _platform = auxv->a_un.a_ptr; 145 break; 146 case AT_SUN_EXECNAME: 147 /* full pathname of execed object */ 148 _execname = auxv->a_un.a_ptr; 149 break; 150 case AT_SUN_AUXFLAGS: 151 auxflags = (int)auxv->a_un.a_val; 152 break; 153 case AT_SUN_HWCAP: 154 hwcap_1 = (uint_t)auxv->a_un.a_val; 155 break; 156 } 157 } 158 159 /* 160 * Get needed info from ld.so's dynamic structure. 161 */ 162 /* LINTED */ 163 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); 164 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { 165 switch (ld_dyn->d_tag) { 166 case DT_RELA: 167 reladdr = ld_dyn->d_un.d_ptr + ld_base; 168 break; 169 case DT_RELACOUNT: 170 relacount = ld_dyn->d_un.d_val; 171 break; 172 case DT_RELAENT: 173 relaent = ld_dyn->d_un.d_val; 174 break; 175 case DT_PLTRELSZ: 176 pltrelsz = ld_dyn->d_un.d_val; 177 break; 178 case DT_STRTAB: 179 strtab = ld_dyn->d_un.d_ptr + ld_base; 180 break; 181 case DT_SONAME: 182 soname = ld_dyn->d_un.d_val; 183 break; 184 } 185 } 186 _rt_name = (char *)strtab + soname; 187 188 /* 189 * If we don't have a RELAENT, just assume 190 * the size. 191 */ 192 if (relaent == 0) 193 relaent = sizeof (Rela); 194 /* 195 * Relocate all symbols in ld.so. 196 * 197 * Because ld.so.1 is built with -Bsymbolic there should only be 198 * RELATIVE and JMPSLOT relocations, both of which get relative 199 * additions against them. 200 */ 201 relacount += (pltrelsz / relaent); 202 for (; relacount; relacount--) { 203 ulong_t roffset; 204 205 roffset = ((Rela *)reladdr)->r_offset + ld_base; 206 *((ulong_t *)roffset) += ld_base + 207 ((Rela *)reladdr)->r_addend; 208 reladdr += relaent; 209 } 210 211 /* 212 * Initialize the dyn_plt_ent_size field. It currently contains the 213 * size of the dyn_plt_template. It still needs to be aligned and have 214 * space for the 'dyn_data' area added. 215 */ 216 dyn_plt_ent_size = ROUND(dyn_plt_ent_size, M_WORD_ALIGN) + 217 sizeof (uintptr_t) + sizeof (uintptr_t) + sizeof (ulong_t) + 218 sizeof (ulong_t) + sizeof (Sym); 219 220 /* 221 * Continue with generic startup processing. 222 */ 223 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, 224 _syspagsz, _rt_name, dyn_ptr, ld_base, interp_base, fd, phdr, 225 _execname, _argv, dz_fd, uid, euid, gid, egid, NULL, auxflags, 226 hwcap_1)) == NULL) { 227 rtldexit(&lml_main, 1); 228 } 229 230 return (LM_ENTRY_PT(lmp)()); 231 } 232