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 2004 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <stdio.h> 33 #include <memory.h> 34 #include "debug.h" 35 #include "msg.h" 36 #include "_libld.h" 37 38 39 /* 40 * The loader uses a `segment descriptor' list to describe the output 41 * segments it can potentially create. Additional segments may be added 42 * using a map file. 43 */ 44 #ifdef _ELF64 45 /* Phdr packing changes under Elf64 */ 46 static Sg_desc sg_desc[LD_NUM] = { 47 {{PT_PHDR, PF_R + PF_X, 0, 0, 0, 0, 0, 0}, 48 MSG_ORIG(MSG_ENT_PHDR), 0, 0, {NULL, NULL}, {NULL, NULL}, 49 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 50 {{PT_INTERP, PF_R, 0, 0, 0, 0, 0, 0}, 51 MSG_ORIG(MSG_ENT_INTERP), 0, 0, {NULL, NULL}, {NULL, NULL}, 52 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 53 {{PT_SUNWCAP, PF_R, 0, 0, 0, 0, 0, 0}, 54 MSG_ORIG(MSG_ENT_SUNWCAP), 0, 0, {NULL, NULL}, {NULL, NULL}, 55 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 56 {{PT_LOAD, PF_R + PF_X, 0, 0, 0, 0, 0, 0}, 57 MSG_ORIG(MSG_ENT_TEXT), 0, 0, {NULL, NULL}, {NULL, NULL}, 58 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 59 {{PT_LOAD, M_DATASEG_PERM, 0, 0, 0, 0, 0, 0}, 60 MSG_ORIG(MSG_ENT_DATA), 0, 0, {NULL, NULL}, {NULL, NULL}, 61 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 62 {{PT_LOAD, M_DATASEG_PERM, 0, 0, 0, 0, 0, 0}, 63 MSG_ORIG(MSG_ENT_BSS), 0, 0, {NULL, NULL}, {NULL, NULL}, 64 (FLG_SG_TYPE | FLG_SG_FLAGS | FLG_SG_DISABLED), NULL, 0, 0}, 65 {{PT_DYNAMIC, M_DATASEG_PERM, 0, 0, 0, 0, 0, 0}, 66 MSG_ORIG(MSG_ENT_DYNAMIC), 0, 0, {NULL, NULL}, {NULL, NULL}, 67 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 68 {{PT_SUNWDTRACE, M_DATASEG_PERM | PF_X, 0, 0, 0, 0, 0, 0}, 69 MSG_ORIG(MSG_ENT_DTRACE), 0, 0, {NULL, NULL}, {NULL, NULL}, 70 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 71 {{PT_NOTE, 0, 0, 0, 0, 0, 0, 0}, 72 MSG_ORIG(MSG_ENT_NOTE), 0, 0, {NULL, NULL}, {NULL, NULL}, 73 FLG_SG_TYPE, NULL, 0, 0}, 74 {{PT_SUNWBSS, 0, 0, 0, 0, 0, 0, 0}, 75 MSG_ORIG(MSG_ENT_SUNWBSS), 0, 0, {NULL, NULL}, {NULL, NULL}, 76 FLG_SG_TYPE, NULL, 0, 0}, 77 {{PT_TLS, PF_R, 0, 0, 0, 0, 0, 0}, 78 MSG_ORIG(MSG_ENT_TLS), 0, 0, {NULL, NULL}, {NULL, NULL}, 79 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 80 #if defined(__i386) || defined(__amd64) 81 {{PT_SUNW_UNWIND, PF_R, 0, 0, 0, 0, 0, 0}, 82 MSG_ORIG(MSG_ENT_UNWIND), 0, 0, {NULL, NULL}, {NULL, NULL}, 83 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 84 #endif 85 {{PT_NULL, 0, 0, 0, 0, 0, 0, 0}, 86 MSG_ORIG(MSG_STR_EMPTY), 0, 0, {NULL, NULL}, {NULL, NULL}, 87 FLG_SG_TYPE, NULL, 0, 0} 88 }; 89 #else /* Elf32 */ 90 static Sg_desc sg_desc[LD_NUM] = { 91 {{PT_PHDR, 0, 0, 0, 0, 0, PF_R + PF_X, 0}, 92 MSG_ORIG(MSG_ENT_PHDR), 0, 0, {NULL, NULL}, {NULL, NULL}, 93 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 94 {{PT_INTERP, 0, 0, 0, 0, 0, PF_R, 0}, 95 MSG_ORIG(MSG_ENT_INTERP), 0, 0, {NULL, NULL}, {NULL, NULL}, 96 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 97 {{PT_SUNWCAP, 0, 0, 0, 0, 0, PF_R, 0}, 98 MSG_ORIG(MSG_ENT_SUNWCAP), 0, 0, {NULL, NULL}, {NULL, NULL}, 99 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 100 {{PT_LOAD, 0, 0, 0, 0, 0, PF_R + PF_X, 0}, 101 MSG_ORIG(MSG_ENT_TEXT), 0, 0, {NULL, NULL}, {NULL, NULL}, 102 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 103 {{PT_LOAD, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0}, 104 MSG_ORIG(MSG_ENT_DATA), 0, 0, {NULL, NULL}, {NULL, NULL}, 105 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 106 {{PT_LOAD, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0}, 107 MSG_ORIG(MSG_ENT_BSS), 0, 0, {NULL, NULL}, {NULL, NULL}, 108 (FLG_SG_TYPE | FLG_SG_FLAGS | FLG_SG_DISABLED), NULL, 0, 0}, 109 {{PT_DYNAMIC, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0}, 110 MSG_ORIG(MSG_ENT_DYNAMIC), 0, 0, {NULL, NULL}, {NULL, NULL}, 111 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 112 {{PT_SUNWDTRACE, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0}, 113 MSG_ORIG(MSG_ENT_DTRACE), 0, 0, {NULL, NULL}, {NULL, NULL}, 114 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 115 {{PT_NOTE, 0, 0, 0, 0, 0, 0, 0}, 116 MSG_ORIG(MSG_ENT_NOTE), 0, 0, {NULL, NULL}, {NULL, NULL}, 117 FLG_SG_TYPE, NULL, 0, 0}, 118 {{PT_SUNWBSS, 0, 0, 0, 0, 0, 0, 0}, 119 MSG_ORIG(MSG_ENT_SUNWBSS), 0, 0, {NULL, NULL}, {NULL, NULL}, 120 FLG_SG_TYPE, NULL, 0, 0}, 121 {{PT_TLS, PF_R, 0, 0, 0, 0, 0, 0}, 122 MSG_ORIG(MSG_ENT_TLS), 0, 0, {NULL, NULL}, {NULL, NULL}, 123 (FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0}, 124 {{PT_NULL, 0, 0, 0, 0, 0, 0, 0}, 125 MSG_ORIG(MSG_STR_EMPTY), 0, 0, {NULL, NULL}, {NULL, NULL}, 126 FLG_SG_TYPE, NULL, 0, 0} 127 }; 128 #endif /* Elfxx */ 129 130 131 /* 132 * The input processing of the loader involves matching the sections of its 133 * input files to an `entrance descriptor definition'. The entrance criteria 134 * is different for either a static or dynamic linkage, and may even be 135 * modified further using a map file. Each entrance criteria is associated 136 * with a segment descriptor, thus a mapping of input sections to output 137 * segments is maintained. 138 */ 139 static const Ent_desc ent_desc[] = { 140 {{NULL, NULL}, MSG_ORIG(MSG_SCN_SUNWBSS), NULL, 141 SHF_ALLOC + SHF_WRITE, SHF_ALLOC + SHF_WRITE, 142 (Sg_desc *)LD_SUNWBSS, 0, FALSE}, 143 {{NULL, NULL}, NULL, SHT_NOTE, 0, 0, 144 (Sg_desc *)LD_NOTE, 0, FALSE}, 145 {{NULL, NULL}, NULL, NULL, 146 SHF_ALLOC + SHF_WRITE, SHF_ALLOC, 147 (Sg_desc *)LD_TEXT, 0, FALSE}, 148 {{NULL, NULL}, NULL, SHT_NOBITS, 149 SHF_ALLOC + SHF_WRITE, SHF_ALLOC + SHF_WRITE, 150 (Sg_desc *)LD_BSS, 0, FALSE}, 151 {{NULL, NULL}, NULL, NULL, 152 SHF_ALLOC + SHF_WRITE, SHF_ALLOC + SHF_WRITE, 153 (Sg_desc *)LD_DATA, 0, FALSE}, 154 {{NULL, NULL}, NULL, 0, 0, 0, 155 (Sg_desc *)LD_EXTRA, 0, FALSE} 156 }; 157 158 /* 159 * Initialize new entrance and segment descriptors and add them as lists to 160 * the output file descriptor. 161 */ 162 uintptr_t 163 ent_setup(Ofl_desc * ofl, Xword segalign) 164 { 165 Ent_desc * enp; 166 Sg_desc * sgp; 167 size_t size; 168 169 /* 170 * Initialize the elf library. 171 */ 172 if (elf_version(EV_CURRENT) == EV_NONE) { 173 eprintf(ERR_FATAL, MSG_INTL(MSG_ELF_LIBELF), EV_CURRENT); 174 return (S_ERROR); 175 } 176 177 /* 178 * Initialize internal Global Symbol Table AVL tree 179 */ 180 avl_create(&ofl->ofl_symavl, &sym_avl_comp, sizeof (Sym_avlnode), 181 SGSOFFSETOF(Sym_avlnode, sav_node)); 182 /* 183 * The datasegment permissions can differ depending on whether 184 * this object is built statically or dynamically. 185 */ 186 if (ofl->ofl_flags & FLG_OF_DYNAMIC) { 187 sg_desc[LD_DATA].sg_phdr.p_flags = M_DATASEG_PERM; 188 sg_desc[LD_SUNWBSS].sg_phdr.p_flags = M_DATASEG_PERM; 189 } else { 190 sg_desc[LD_DATA].sg_phdr.p_flags = M_DATASEG_PERM | PF_X; 191 } 192 193 /* 194 * Allocate and initialize writable copies of both the entrance and 195 * segment descriptors. 196 */ 197 if ((sgp = libld_malloc(sizeof (sg_desc))) == 0) 198 return (S_ERROR); 199 (void) memcpy(sgp, sg_desc, sizeof (sg_desc)); 200 if ((enp = libld_malloc(sizeof (ent_desc))) == 0) 201 return (S_ERROR); 202 (void) memcpy(enp, ent_desc, sizeof (ent_desc)); 203 204 /* 205 * Traverse the new entrance descriptor list converting the segment 206 * pointer entries to the absolute address within the new segment 207 * descriptor list. Add each entrance descriptor to the output file 208 * list. 209 */ 210 for (size = 0; size < sizeof (ent_desc); size += sizeof (Ent_desc)) { 211 enp->ec_segment = &sgp[(long)enp->ec_segment]; 212 if ((list_appendc(&ofl->ofl_ents, enp)) == 0) 213 return (S_ERROR); 214 enp++; 215 } 216 217 /* 218 * Traverse the new segment descriptor list adding each entry to the 219 * segment descriptor list. For each loadable segment initialize 220 * a default alignment (ld(1) and ld.so.1 initialize this differently). 221 */ 222 for (size = 0; size < sizeof (sg_desc); size += sizeof (Sg_desc)) { 223 224 Phdr * phdr = &(sgp->sg_phdr); 225 226 if ((list_appendc(&ofl->ofl_segs, sgp)) == 0) 227 return (S_ERROR); 228 if (phdr->p_type == PT_LOAD) 229 phdr->p_align = segalign; 230 231 sgp++; 232 } 233 return (1); 234 } 235