17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 55aefb655Srie * Common Development and Distribution License (the "License"). 65aefb655Srie * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 21552ff457Srie 227c478bd9Sstevel@tonic-gate /* 23bf994817SAli Bahrami * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved. 247c478bd9Sstevel@tonic-gate */ 25552ff457Srie 260250bb16SJohn Levon /* 270250bb16SJohn Levon * Copyright 2019 Joyent, Inc. 280250bb16SJohn Levon */ 290250bb16SJohn Levon 300250bb16SJohn Levon /* 310250bb16SJohn Levon * While this is no longer relevant to the kernel, we keep it in its 320250bb16SJohn Levon * traditional location to match the other variants, used from the ld 330250bb16SJohn Levon * code. 340250bb16SJohn Levon */ 350250bb16SJohn Levon 36ba2be530Sab196087 #define ELF_TARGET_386 37ba2be530Sab196087 #if defined(DO_RELOC_LIBLD) 38ba2be530Sab196087 #undef DO_RELOC_LIBLD 39ba2be530Sab196087 #define DO_RELOC_LIBLD_X86 40ba2be530Sab196087 #endif 417c478bd9Sstevel@tonic-gate #include <stdio.h> 427c478bd9Sstevel@tonic-gate #include "sgs.h" 437c478bd9Sstevel@tonic-gate #include "machdep.h" 447c478bd9Sstevel@tonic-gate #include "libld.h" 457c478bd9Sstevel@tonic-gate #include "reloc.h" 467c478bd9Sstevel@tonic-gate #include "conv.h" 477c478bd9Sstevel@tonic-gate #include "msg.h" 487c478bd9Sstevel@tonic-gate 497c478bd9Sstevel@tonic-gate /* 50ba2be530Sab196087 * We need to build this code differently when it is used for 51ba2be530Sab196087 * cross linking: 52ba2be530Sab196087 * - Data alignment requirements can differ from those 53ba2be530Sab196087 * of the running system, so we can't access data 54ba2be530Sab196087 * in units larger than a byte 55ba2be530Sab196087 * - We have to include code to do byte swapping when the 56ba2be530Sab196087 * target and linker host use different byte ordering, 57ba2be530Sab196087 * but such code is a waste when running natively. 58ba2be530Sab196087 */ 5986ef0a63SRichard Lowe #if !defined(DO_RELOC_LIBLD) || defined(__x86) 60ba2be530Sab196087 #define DORELOC_NATIVE 61ba2be530Sab196087 #endif 62ba2be530Sab196087 63ba2be530Sab196087 /* 64552ff457Srie * This table represents the current relocations that do_reloc() is able to 65552ff457Srie * process. The relocations below that are marked SPECIAL are relocations that 66552ff457Srie * take special processing and shouldn't actually ever be passed to do_reloc(). 677c478bd9Sstevel@tonic-gate */ 687c478bd9Sstevel@tonic-gate const Rel_entry reloc_table[R_386_NUM] = { 69*a530dbfeSRichard Lowe [R_386_NONE] = {0, FLG_RE_NOTREL, 0, 0, 0}, 70*a530dbfeSRichard Lowe [R_386_32] = {0, FLG_RE_NOTREL, 4, 0, 0}, 71*a530dbfeSRichard Lowe [R_386_PC32] = {0, FLG_RE_PCREL, 4, 0, 0}, 72*a530dbfeSRichard Lowe [R_386_GOT32] = {0, FLG_RE_GOTADD, 4, 0, 0}, 73*a530dbfeSRichard Lowe [R_386_PLT32] = {0, FLG_RE_PLTREL | FLG_RE_PCREL, 4, 0, 0}, 74*a530dbfeSRichard Lowe [R_386_COPY] = {0, FLG_RE_NOTREL, 0, 0, 0}, /* SPECIAL */ 75*a530dbfeSRichard Lowe [R_386_GLOB_DAT] = {0, FLG_RE_NOTREL, 4, 0, 0}, 76*a530dbfeSRichard Lowe [R_386_JMP_SLOT] = {0, FLG_RE_NOTREL, 4, 0, 0}, /* SPECIAL */ 77*a530dbfeSRichard Lowe [R_386_RELATIVE] = {0, FLG_RE_NOTREL, 4, 0, 0}, 78*a530dbfeSRichard Lowe [R_386_GOTOFF] = {0, FLG_RE_GOTREL, 4, 0, 0}, 79*a530dbfeSRichard Lowe [R_386_GOTPC] = {0, FLG_RE_PCREL | FLG_RE_GOTPC | 80*a530dbfeSRichard Lowe FLG_RE_LOCLBND, 4, 0, 0}, 81*a530dbfeSRichard Lowe [R_386_32PLT] = {0, FLG_RE_PLTREL, 4, 0, 0}, 82*a530dbfeSRichard Lowe [R_386_TLS_GD_PLT] = {0, FLG_RE_PLTREL | FLG_RE_PCREL | 83*a530dbfeSRichard Lowe FLG_RE_TLSGD, 4, 0, 0}, 84*a530dbfeSRichard Lowe [R_386_TLS_LDM_PLT] = {0, FLG_RE_PLTREL | FLG_RE_PCREL | 85*a530dbfeSRichard Lowe FLG_RE_TLSLD, 4, 0, 0}, 86*a530dbfeSRichard Lowe [R_386_TLS_TPOFF] = {0, FLG_RE_NOTREL, 4, 0, 0}, 87*a530dbfeSRichard Lowe [R_386_TLS_IE] = {0, FLG_RE_GOTADD | FLG_RE_TLSIE, 4, 0, 0}, 88*a530dbfeSRichard Lowe [R_386_TLS_GOTIE] = {0, FLG_RE_GOTADD | FLG_RE_TLSIE, 4, 0, 0}, 89*a530dbfeSRichard Lowe [R_386_TLS_LE] = {0, FLG_RE_TLSLE, 4, 0, 0}, 90*a530dbfeSRichard Lowe [R_386_TLS_GD] = {0, FLG_RE_GOTADD | FLG_RE_TLSGD, 4, 0, 0}, 91*a530dbfeSRichard Lowe [R_386_TLS_LDM] = {0, FLG_RE_GOTADD | FLG_RE_TLSLD, 4, 0, 0}, 92*a530dbfeSRichard Lowe [R_386_16] = {0, FLG_RE_NOTREL, 2, 0, 0}, 93*a530dbfeSRichard Lowe [R_386_PC16] = {0, FLG_RE_PCREL, 2, 0, 0}, 94*a530dbfeSRichard Lowe [R_386_8] = {0, FLG_RE_NOTREL, 1, 0, 0}, 95*a530dbfeSRichard Lowe [R_386_PC8] = {0, FLG_RE_PCREL, 1, 0, 0}, 96*a530dbfeSRichard Lowe [R_386_TLS_GD_32] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 97*a530dbfeSRichard Lowe [R_386_TLS_GD_PUSH] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 98*a530dbfeSRichard Lowe [R_386_TLS_GD_CALL] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 99*a530dbfeSRichard Lowe [R_386_TLS_GD_POP] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 100*a530dbfeSRichard Lowe [R_386_TLS_LDM_32] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 101*a530dbfeSRichard Lowe [R_386_TLS_LDM_PUSH] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 102*a530dbfeSRichard Lowe [R_386_TLS_LDM_CALL] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 103*a530dbfeSRichard Lowe [R_386_TLS_LDM_POP] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 104*a530dbfeSRichard Lowe [R_386_TLS_LDO_32] = {0, FLG_RE_TLSLD, 4, 0, 0}, 105*a530dbfeSRichard Lowe [R_386_TLS_IE_32] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 106*a530dbfeSRichard Lowe [R_386_TLS_LE_32] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 107*a530dbfeSRichard Lowe [R_386_TLS_DTPMOD32] = {0, FLG_RE_NOTREL, 4, 0, 0}, 108*a530dbfeSRichard Lowe [R_386_TLS_DTPOFF32] = {0, FLG_RE_NOTREL, 4, 0, 0}, 109*a530dbfeSRichard Lowe [R_386_TLS_TPOFF32] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 110*a530dbfeSRichard Lowe [R_386_SIZE32] = {0, FLG_RE_SIZE | FLG_RE_VERIFY, 4, 0, 0}, 111*a530dbfeSRichard Lowe [R_386_TLS_GOTDESC] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 112*a530dbfeSRichard Lowe [R_386_TLS_DESC_CALL] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 113*a530dbfeSRichard Lowe [R_386_TLS_DESC] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 114*a530dbfeSRichard Lowe [R_386_IRELATIVE] = {0, FLG_RE_NOTSUP, 0, 0, 0}, 115*a530dbfeSRichard Lowe [R_386_GOT32X] = {0, FLG_RE_NOTSUP, 0, 0, 0} 1167c478bd9Sstevel@tonic-gate }; 117*a530dbfeSRichard Lowe #if (R_386_NUM != (R_386_GOT32X + 1)) 118*a530dbfeSRichard Lowe #error "R_386_NUM has grown" 119*a530dbfeSRichard Lowe #endif 1207c478bd9Sstevel@tonic-gate 1217c478bd9Sstevel@tonic-gate /* 1227c478bd9Sstevel@tonic-gate * Write a single relocated value to its reference location. 123552ff457Srie * We assume we wish to add the relocation amount, value, to the 1247c478bd9Sstevel@tonic-gate * value of the address already present at the offset. 1257c478bd9Sstevel@tonic-gate * 1267c478bd9Sstevel@tonic-gate * NAME VALUE FIELD CALCULATION 1277c478bd9Sstevel@tonic-gate * 1287c478bd9Sstevel@tonic-gate * R_386_NONE 0 none none 1297c478bd9Sstevel@tonic-gate * R_386_32 1 word32 S + A 1307c478bd9Sstevel@tonic-gate * R_386_PC32 2 word32 S + A - P 131*a530dbfeSRichard Lowe * R_386_GOT32 3 word32 G + A - GOT / G + A 1327c478bd9Sstevel@tonic-gate * R_386_PLT32 4 word32 L + A - P 1337c478bd9Sstevel@tonic-gate * R_386_COPY 5 none none 1347c478bd9Sstevel@tonic-gate * R_386_GLOB_DAT 6 word32 S 1357c478bd9Sstevel@tonic-gate * R_386_JMP_SLOT 7 word32 S 1367c478bd9Sstevel@tonic-gate * R_386_RELATIVE 8 word32 B + A 1377c478bd9Sstevel@tonic-gate * R_386_GOTOFF 9 word32 S + A - GOT 1387c478bd9Sstevel@tonic-gate * R_386_GOTPC 10 word32 GOT + A - P 1397c478bd9Sstevel@tonic-gate * R_386_32PLT 11 word32 L + A 1407c478bd9Sstevel@tonic-gate * R_386_TLS_GD_PLT 12 word32 @tlsgdplt 1417c478bd9Sstevel@tonic-gate * R_386_TLS_LDM_PLT 13 word32 @tlsldmplt 1427c478bd9Sstevel@tonic-gate * R_386_TLS_TPOFF 14 word32 @ntpoff(S) 1437c478bd9Sstevel@tonic-gate * R_386_TLS_IE 15 word32 @indntpoff(S) 144*a530dbfeSRichard Lowe * R_386_TLS_GOTIE 16 word32 @gotntpoff(S) 145*a530dbfeSRichard Lowe * R_386_TLS_LE 17 word32 @ntpoff(S) 1467c478bd9Sstevel@tonic-gate * R_386_TLS_GD 18 word32 @tlsgd(S) 1477c478bd9Sstevel@tonic-gate * R_386_TLS_LDM 19 word32 @tlsldm(S) 148552ff457Srie * R_386_16 20 word16 S + A 149552ff457Srie * R_386_PC16 21 word16 S + A - P 150552ff457Srie * R_386_8 22 word8 S + A 151552ff457Srie * R_386_PC8 23 word8 S + A - P 152*a530dbfeSRichard Lowe * R_386_TLS_GD_32 24 word32 153*a530dbfeSRichard Lowe * R_386_TLS_GD_PUSH 25 word32 154*a530dbfeSRichard Lowe * R_386_TLS_GD_CALL 26 word32 155*a530dbfeSRichard Lowe * R_386_TLS_GD_POP 27 word32 156*a530dbfeSRichard Lowe * R_386_TLS_LDM_32 28 word32 157*a530dbfeSRichard Lowe * R_386_TLS_LDM_PUSH 29 word32 158*a530dbfeSRichard Lowe * R_386_TLS_LDM_CALL 30 word32 159*a530dbfeSRichard Lowe * R_386_TLS_LDM_POP 31 word32 1607c478bd9Sstevel@tonic-gate * R_386_TLS_LDO_32 32 word32 @dtpoff(S) 161*a530dbfeSRichard Lowe * R_386_TLS_IE_32 33 word32 @gotpoff(S) 162*a530dbfeSRichard Lowe * R_386_TLS_LE_32 34 word32 @tpoff(S) 1637c478bd9Sstevel@tonic-gate * R_386_TLS_DTPMOD32 35 word32 @dtpmod(S) 1647c478bd9Sstevel@tonic-gate * R_386_TLS_DTPOFF32 36 word32 @dtpoff(S) 165*a530dbfeSRichard Lowe * R_386_TLS_TPOFF32 37 word32 1662926dd2eSrie * R_386_SIZE32 38 word32 Z + A 167*a530dbfeSRichard Lowe * R_386_TLS_GOTDESC 39 word32 168*a530dbfeSRichard Lowe * R_386_TLS_DESC_CALL 40 none none 169*a530dbfeSRichard Lowe * R_386_TLS_DESC 41 word32 170*a530dbfeSRichard Lowe * R_386_IRELATIVE 42 word32 indirect (B + A) 171*a530dbfeSRichard Lowe * R_386_GOT32X 43 word32 G + A - GOT / G + A 1727c478bd9Sstevel@tonic-gate * 173*a530dbfeSRichard Lowe * Relocations are from Table 3.6: Relocation Types from the 386 psABI. 174*a530dbfeSRichard Lowe * (with reference also to the thread-local storage ABIs) 1757c478bd9Sstevel@tonic-gate * 1767c478bd9Sstevel@tonic-gate * Relocation calculations: 1777c478bd9Sstevel@tonic-gate * 1787c478bd9Sstevel@tonic-gate * CALCULATION uses the following notation: 1797c478bd9Sstevel@tonic-gate * A the addend used 1807c478bd9Sstevel@tonic-gate * B the base address of the shared object in memory 1817c478bd9Sstevel@tonic-gate * G the offset into the global offset table 1827c478bd9Sstevel@tonic-gate * GOT the address of teh global offset table 1837c478bd9Sstevel@tonic-gate * L the procedure linkage entry 1847c478bd9Sstevel@tonic-gate * P the place of the storage unit being relocated 1857c478bd9Sstevel@tonic-gate * S the value of the symbol 1862926dd2eSrie * Z the size of the symbol whose index resides in the relocation 1872926dd2eSrie * entry 1887c478bd9Sstevel@tonic-gate * 1897c478bd9Sstevel@tonic-gate * @dtlndx(x): Allocate two contiguous entries in the GOT table to hold 1907c478bd9Sstevel@tonic-gate * a Tls_index structure (for passing to __tls_get_addr()). The 1917c478bd9Sstevel@tonic-gate * instructions referencing this entry will be bound to the first 1927c478bd9Sstevel@tonic-gate * of the two GOT entries. 1937c478bd9Sstevel@tonic-gate * 1947c478bd9Sstevel@tonic-gate * @tmndx(x): Allocate two contiguous entries in the GOT table to hold 1957c478bd9Sstevel@tonic-gate * a Tls_index structure (for passing to __tls_get_addr()). The 1967c478bd9Sstevel@tonic-gate * ti_offset field of the Tls_index will be set to 0 (zero) and the 1977c478bd9Sstevel@tonic-gate * ti_module will be filled in at run-time. The call to 1987c478bd9Sstevel@tonic-gate * __tls_get_addr() will return the starting offset of the dynamic 1997c478bd9Sstevel@tonic-gate * TLS block. 2007c478bd9Sstevel@tonic-gate * 2017c478bd9Sstevel@tonic-gate * @dtpoff(x): calculate the tlsoffset relative to the TLS block. 2027c478bd9Sstevel@tonic-gate * 2037c478bd9Sstevel@tonic-gate * @tpoff(x): calculate the tlsoffset relative to the TLS block. 2047c478bd9Sstevel@tonic-gate * 2057c478bd9Sstevel@tonic-gate * @dtpmod(x): calculate the module id of the object containing symbol x. 2067c478bd9Sstevel@tonic-gate * 2077c478bd9Sstevel@tonic-gate * The calculations in the CALCULATION column are assumed to have 2087c478bd9Sstevel@tonic-gate * been performed before calling this function except for the addition of 2097c478bd9Sstevel@tonic-gate * the addresses in the instructions. 2107c478bd9Sstevel@tonic-gate */ 21186ef0a63SRichard Lowe /* BEGIN CSTYLED */ 2120250bb16SJohn Levon #if defined(DO_RELOC_LIBLD) 213ba2be530Sab196087 /*ARGSUSED5*/ 214f3324781Sab196087 int 215bf994817SAli Bahrami do_reloc_ld(Rel_desc *rdesc, uchar_t *off, Xword *value, 216bf994817SAli Bahrami rel_desc_sname_func_t rel_desc_sname_func, 217f3324781Sab196087 const char *file, int bswap, void *lml) 218f3324781Sab196087 #else 219f3324781Sab196087 int 220f3324781Sab196087 do_reloc_rtld(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 2215aefb655Srie const char *file, void *lml) 222f3324781Sab196087 #endif 2237c478bd9Sstevel@tonic-gate { 22486ef0a63SRichard Lowe /* END CSTYLED */ 225bf994817SAli Bahrami #ifdef DO_RELOC_LIBLD 226bf994817SAli Bahrami #define sym (* rel_desc_sname_func)(rdesc) 227bf994817SAli Bahrami uchar_t rtype = rdesc->rel_rtype; 228bf994817SAli Bahrami #endif 2297c478bd9Sstevel@tonic-gate const Rel_entry *rep; 2307c478bd9Sstevel@tonic-gate 2317c478bd9Sstevel@tonic-gate rep = &reloc_table[rtype]; 232552ff457Srie 233552ff457Srie switch (rep->re_fsize) { 234552ff457Srie case 1: 235552ff457Srie /* LINTED */ 236552ff457Srie *((uchar_t *)off) += (uchar_t)(*value); 237552ff457Srie break; 238ba2be530Sab196087 239552ff457Srie case 2: 240ba2be530Sab196087 #if defined(DORELOC_NATIVE) 241552ff457Srie /* LINTED */ 242552ff457Srie *((Half *)off) += (Half)(*value); 243ba2be530Sab196087 #else 244ba2be530Sab196087 { 245ba2be530Sab196087 Half v; 246ba2be530Sab196087 uchar_t *v_bytes = (uchar_t *)&v; 247ba2be530Sab196087 248ba2be530Sab196087 if (bswap) { 249ba2be530Sab196087 UL_ASSIGN_BSWAP_HALF(v_bytes, off); 250ba2be530Sab196087 v += *value; 251ba2be530Sab196087 UL_ASSIGN_BSWAP_HALF(off, v_bytes); 252ba2be530Sab196087 } else { 253ba2be530Sab196087 UL_ASSIGN_HALF(v_bytes, off); 254ba2be530Sab196087 v += *value; 255ba2be530Sab196087 UL_ASSIGN_HALF(off, v_bytes); 256ba2be530Sab196087 } 257ba2be530Sab196087 } 258ba2be530Sab196087 #endif 259552ff457Srie break; 260ba2be530Sab196087 261552ff457Srie case 4: 262ba2be530Sab196087 #if defined(DORELOC_NATIVE) 2637c478bd9Sstevel@tonic-gate /* LINTED */ 2647c478bd9Sstevel@tonic-gate *((Xword *)off) += *value; 265ba2be530Sab196087 #else 266ba2be530Sab196087 { 267ba2be530Sab196087 Word v; 268ba2be530Sab196087 uchar_t *v_bytes = (uchar_t *)&v; 269ba2be530Sab196087 270ba2be530Sab196087 if (bswap) { 271ba2be530Sab196087 UL_ASSIGN_BSWAP_WORD(v_bytes, off); 272ba2be530Sab196087 v += *value; 273ba2be530Sab196087 UL_ASSIGN_BSWAP_WORD(off, v_bytes); 274ba2be530Sab196087 } else { 275ba2be530Sab196087 UL_ASSIGN_WORD(v_bytes, off); 276ba2be530Sab196087 v += *value; 277ba2be530Sab196087 UL_ASSIGN_WORD(off, v_bytes); 278ba2be530Sab196087 } 279ba2be530Sab196087 } 280ba2be530Sab196087 #endif 281552ff457Srie break; 282552ff457Srie default: 283552ff457Srie /* 284552ff457Srie * To keep chkmsg() happy: MSG_INTL(MSG_REL_UNSUPSZ) 285552ff457Srie */ 2865aefb655Srie REL_ERR_UNSUPSZ(lml, file, sym, rtype, rep->re_fsize); 287552ff457Srie return (0); 288552ff457Srie } 2897c478bd9Sstevel@tonic-gate return (1); 290bf994817SAli Bahrami 291bf994817SAli Bahrami #ifdef DO_RELOC_LIBLD 292bf994817SAli Bahrami #undef sym 293bf994817SAli Bahrami #endif 2947c478bd9Sstevel@tonic-gate } 295