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 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #if defined(_KERNEL) 30 #include <sys/types.h> 31 #include "reloc.h" 32 #else 33 #define ELF_TARGET_386 34 #if defined(DO_RELOC_LIBLD) 35 #undef DO_RELOC_LIBLD 36 #define DO_RELOC_LIBLD_X86 37 #endif 38 #include <stdio.h> 39 #include "sgs.h" 40 #include "machdep.h" 41 #include "libld.h" 42 #include "reloc.h" 43 #include "conv.h" 44 #include "msg.h" 45 #endif 46 47 /* 48 * We need to build this code differently when it is used for 49 * cross linking: 50 * - Data alignment requirements can differ from those 51 * of the running system, so we can't access data 52 * in units larger than a byte 53 * - We have to include code to do byte swapping when the 54 * target and linker host use different byte ordering, 55 * but such code is a waste when running natively. 56 */ 57 #if !defined(DO_RELOC_LIBLD) || defined(__i386) || defined(__amd64) 58 #define DORELOC_NATIVE 59 #endif 60 61 /* 62 * This table represents the current relocations that do_reloc() is able to 63 * process. The relocations below that are marked SPECIAL are relocations that 64 * take special processing and shouldn't actually ever be passed to do_reloc(). 65 */ 66 const Rel_entry reloc_table[R_386_NUM] = { 67 /* R_386_NONE */ {0, FLG_RE_NOTREL, 0, 0, 0}, 68 /* R_386_32 */ {0, FLG_RE_NOTREL, 4, 0, 0}, 69 /* R_386_PC32 */ {0, FLG_RE_PCREL, 4, 0, 0}, 70 /* R_386_GOT32 */ {0, FLG_RE_GOTADD, 4, 0, 0}, 71 /* R_386_PLT32 */ {0, FLG_RE_PLTREL | FLG_RE_PCREL, 4, 0, 0}, 72 /* R_386_COPY */ {0, FLG_RE_NOTREL, 0, 0, 0}, /* SPECIAL */ 73 /* R_386_GLOB_DAT */ {0, FLG_RE_NOTREL, 4, 0, 0}, 74 /* R_386_JMP_SLOT */ {0, FLG_RE_NOTREL, 4, 0, 0}, /* SPECIAL */ 75 /* R_386_RELATIVE */ {0, FLG_RE_NOTREL, 4, 0, 0}, 76 /* R_386_GOTOFF */ {0, FLG_RE_GOTREL, 4, 0, 0}, 77 /* R_386_GOTPC */ {0, FLG_RE_PCREL | FLG_RE_GOTPC | FLG_RE_LOCLBND, 4, 78 0, 0}, 79 /* R_386_32PLT */ {0, FLG_RE_PLTREL, 4, 0, 0}, 80 /* R_386_TLS_GD_PLT */ {0, FLG_RE_PLTREL | FLG_RE_PCREL | FLG_RE_TLSGD, 4, 81 0, 0}, 82 /* R_386_TLS_LDM_PLT */ {0, FLG_RE_PLTREL | FLG_RE_PCREL | FLG_RE_TLSLD, 4, 83 0, 0}, 84 /* R_386_TLS_TPOFF */ {0, FLG_RE_NOTREL, 4, 0, 0}, 85 /* R_386_TLS_IE */ {0, FLG_RE_GOTADD | FLG_RE_TLSIE, 4, 0, 0}, 86 /* R_386_TLS_GOTIE */ {0, FLG_RE_GOTADD | FLG_RE_TLSIE, 4, 0, 0}, 87 /* R_386_TLS_LE */ {0, FLG_RE_TLSLE, 4, 0, 0}, 88 /* R_386_TLS_GD */ {0, FLG_RE_GOTADD | FLG_RE_TLSGD, 4, 0, 0}, 89 /* R_386_TLS_LDM */ {0, FLG_RE_GOTADD | FLG_RE_TLSLD, 4, 0, 0}, 90 /* R_386_16 */ {0, FLG_RE_NOTREL, 2, 0, 0}, 91 /* R_386_PC16 */ {0, FLG_RE_PCREL, 2, 0, 0}, 92 /* R_386_8 */ {0, FLG_RE_NOTREL, 1, 0, 0}, 93 /* R_386_PC8 */ {0, FLG_RE_PCREL, 1, 0, 0}, 94 /* R_386_UNKNOWN24 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 95 /* R_386_UNKNOWN25 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 96 /* R_386_UNKNOWN26 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 97 /* R_386_UNKNOWN27 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 98 /* R_386_UNKNOWN28 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 99 /* R_386_UNKNOWN29 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 100 /* R_386_UNKNOWN30 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 101 /* R_386_UNKNOWN31 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 102 /* R_386_TLS_LDO_32 */ {0, FLG_RE_TLSLD, 4, 0, 0}, 103 /* R_386_UNKNOWN33 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 104 /* R_386_UNKNOWN34 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 105 /* R_386_TLS_DTPMOD32 */ {0, FLG_RE_NOTREL, 4, 0, 0}, 106 /* R_386_TLS_DTPOFF32 */ {0, FLG_RE_NOTREL, 4, 0, 0}, 107 /* R_386_UNKONWN37 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 108 /* R_386_SIZE32 */ {0, FLG_RE_SIZE | FLG_RE_VERIFY, 4, 0, 0} 109 }; 110 111 /* 112 * Write a single relocated value to its reference location. 113 * We assume we wish to add the relocation amount, value, to the 114 * value of the address already present at the offset. 115 * 116 * NAME VALUE FIELD CALCULATION 117 * 118 * R_386_NONE 0 none none 119 * R_386_32 1 word32 S + A 120 * R_386_PC32 2 word32 S + A - P 121 * R_386_GOT32 3 word32 G + A - P 122 * R_386_PLT32 4 word32 L + A - P 123 * R_386_COPY 5 none none 124 * R_386_GLOB_DAT 6 word32 S 125 * R_386_JMP_SLOT 7 word32 S 126 * R_386_RELATIVE 8 word32 B + A 127 * R_386_GOTOFF 9 word32 S + A - GOT 128 * R_386_GOTPC 10 word32 GOT + A - P 129 * R_386_32PLT 11 word32 L + A 130 * R_386_TLS_GD_PLT 12 word32 @tlsgdplt 131 * R_386_TLS_LDM_PLT 13 word32 @tlsldmplt 132 * R_386_TLS_TPOFF 14 word32 @ntpoff(S) 133 * R_386_TLS_IE 15 word32 @indntpoff(S) 134 * R_386_TLS_GD 18 word32 @tlsgd(S) 135 * R_386_TLS_LDM 19 word32 @tlsldm(S) 136 * R_386_16 20 word16 S + A 137 * R_386_PC16 21 word16 S + A - P 138 * R_386_8 22 word8 S + A 139 * R_386_PC8 23 word8 S + A - P 140 * R_386_TLS_LDO_32 32 word32 @dtpoff(S) 141 * R_386_TLS_DTPMOD32 35 word32 @dtpmod(S) 142 * R_386_TLS_DTPOFF32 36 word32 @dtpoff(S) 143 * R_386_SIZE32 38 word32 Z + A 144 * 145 * Relocations 0-10 are from Figure 4-4: Relocation Types from the 146 * intel ABI. Relocation 11 (R_386_32PLT) is from the C++ intel abi 147 * and is in the process of being registered with intel ABI (1/13/94). 148 * 149 * Relocations R_386_TLS_* are added to support Thread-Local storage 150 * as recorded in PSARC/2001/509 151 * 152 * Relocation calculations: 153 * 154 * CALCULATION uses the following notation: 155 * A the addend used 156 * B the base address of the shared object in memory 157 * G the offset into the global offset table 158 * GOT the address of teh global offset table 159 * L the procedure linkage entry 160 * P the place of the storage unit being relocated 161 * S the value of the symbol 162 * Z the size of the symbol whose index resides in the relocation 163 * entry 164 * 165 * @dtlndx(x): Allocate two contiguous entries in the GOT table to hold 166 * a Tls_index structure (for passing to __tls_get_addr()). The 167 * instructions referencing this entry will be bound to the first 168 * of the two GOT entries. 169 * 170 * @tmndx(x): Allocate two contiguous entries in the GOT table to hold 171 * a Tls_index structure (for passing to __tls_get_addr()). The 172 * ti_offset field of the Tls_index will be set to 0 (zero) and the 173 * ti_module will be filled in at run-time. The call to 174 * __tls_get_addr() will return the starting offset of the dynamic 175 * TLS block. 176 * 177 * @dtpoff(x): calculate the tlsoffset relative to the TLS block. 178 * 179 * @tpoff(x): calculate the tlsoffset relative to the TLS block. 180 * 181 * @dtpmod(x): calculate the module id of the object containing symbol x. 182 * 183 * The calculations in the CALCULATION column are assumed to have 184 * been performed before calling this function except for the addition of 185 * the addresses in the instructions. 186 */ 187 #if defined(_KERNEL) 188 #define lml 0 /* Needed by arglist of REL_ERR_* macros */ 189 int 190 do_reloc_krtld(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 191 const char *file) 192 #elif defined(DO_RELOC_LIBLD) 193 /*ARGSUSED5*/ 194 int 195 do_reloc_ld(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 196 const char *file, int bswap, void *lml) 197 #else 198 int 199 do_reloc_rtld(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 200 const char *file, void *lml) 201 #endif 202 { 203 const Rel_entry *rep; 204 205 rep = &reloc_table[rtype]; 206 207 switch (rep->re_fsize) { 208 case 1: 209 /* LINTED */ 210 *((uchar_t *)off) += (uchar_t)(*value); 211 break; 212 213 case 2: 214 #if defined(DORELOC_NATIVE) 215 /* LINTED */ 216 *((Half *)off) += (Half)(*value); 217 #else 218 { 219 Half v; 220 uchar_t *v_bytes = (uchar_t *)&v; 221 222 if (bswap) { 223 UL_ASSIGN_BSWAP_HALF(v_bytes, off); 224 v += *value; 225 UL_ASSIGN_BSWAP_HALF(off, v_bytes); 226 } else { 227 UL_ASSIGN_HALF(v_bytes, off); 228 v += *value; 229 UL_ASSIGN_HALF(off, v_bytes); 230 } 231 } 232 #endif 233 break; 234 235 case 4: 236 #if defined(DORELOC_NATIVE) 237 /* LINTED */ 238 *((Xword *)off) += *value; 239 #else 240 { 241 Word v; 242 uchar_t *v_bytes = (uchar_t *)&v; 243 244 if (bswap) { 245 UL_ASSIGN_BSWAP_WORD(v_bytes, off); 246 v += *value; 247 UL_ASSIGN_BSWAP_WORD(off, v_bytes); 248 } else { 249 UL_ASSIGN_WORD(v_bytes, off); 250 v += *value; 251 UL_ASSIGN_WORD(off, v_bytes); 252 } 253 } 254 #endif 255 break; 256 default: 257 /* 258 * To keep chkmsg() happy: MSG_INTL(MSG_REL_UNSUPSZ) 259 */ 260 REL_ERR_UNSUPSZ(lml, file, sym, rtype, rep->re_fsize); 261 return (0); 262 } 263 return (1); 264 } 265