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 /* 24 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 #if defined(_KERNEL) 31 #include <sys/types.h> 32 #include "reloc.h" 33 #else 34 #include <stdio.h> 35 #include "sgs.h" 36 #include "machdep.h" 37 #include "libld.h" 38 #include "reloc.h" 39 #include "conv.h" 40 #include "msg.h" 41 #endif 42 43 /* 44 * This table represents the current relocations that do_reloc() is able to 45 * process. The relocations below that are marked SPECIAL are relocations that 46 * take special processing and shouldn't actually ever be passed to do_reloc(). 47 */ 48 const Rel_entry reloc_table[R_386_NUM] = { 49 /* R_386_NONE */ {FLG_RE_NOTREL, 0}, 50 /* R_386_32 */ {FLG_RE_NOTREL, 4}, 51 /* R_386_PC32 */ {FLG_RE_PCREL, 4}, 52 /* R_386_GOT32 */ {FLG_RE_GOTADD, 4}, 53 /* R_386_PLT32 */ {FLG_RE_PLTREL | FLG_RE_PCREL, 4}, 54 /* R_386_COPY */ {FLG_RE_NOTREL, 0}, /* SPECIAL */ 55 /* R_386_GLOB_DAT */ {FLG_RE_NOTREL, 4}, 56 /* R_386_JMP_SLOT */ {FLG_RE_NOTREL, 4}, /* SPECIAL */ 57 /* R_386_RELATIVE */ {FLG_RE_NOTREL, 4}, 58 /* R_386_GOTOFF */ {FLG_RE_GOTREL, 4}, 59 /* R_386_GOTPC */ {FLG_RE_PCREL | FLG_RE_GOTPC | FLG_RE_LOCLBND, 4}, 60 /* R_386_32PLT */ {FLG_RE_PLTREL, 4}, 61 /* R_386_TLS_GD_PLT */ {FLG_RE_TLSINS | FLG_RE_PLTREL | 62 FLG_RE_PCREL | FLG_RE_TLSGD, 4}, 63 /* R_386_TLS_LDM_PLT */ {FLG_RE_TLSINS | FLG_RE_PLTREL | 64 FLG_RE_PCREL | FLG_RE_TLSLD, 4}, 65 /* R_386_TLS_TPOFF */ {FLG_RE_NOTREL, 4}, 66 /* R_386_TLS_IE */ {FLG_RE_GOTADD | FLG_RE_TLSINS | FLG_RE_TLSIE, 4}, 67 /* R_386_TLS_GOTIE */ {FLG_RE_GOTADD | FLG_RE_TLSINS | FLG_RE_TLSIE, 4}, 68 /* R_386_TLS_LE */ {FLG_RE_TLSINS | FLG_RE_TLSLE, 4}, 69 /* R_386_TLS_GD */ {FLG_RE_GOTADD | FLG_RE_TLSINS | FLG_RE_TLSGD, 4}, 70 /* R_386_TLS_LDM */ {FLG_RE_GOTADD | FLG_RE_TLSLD | FLG_RE_TLSINS, 4}, 71 /* R_386_16 */ {FLG_RE_NOTREL, 2}, 72 /* R_386_PC16 */ {FLG_RE_PCREL, 2}, 73 /* R_386_8 */ {FLG_RE_NOTREL, 1}, 74 /* R_386_PC8 */ {FLG_RE_PCREL, 1}, 75 /* R_386_UNKNOWN24 */ {FLG_RE_NOTSUP, 0}, 76 /* R_386_UNKNOWN25 */ {FLG_RE_NOTSUP, 0}, 77 /* R_386_UNKNOWN26 */ {FLG_RE_NOTSUP, 0}, 78 /* R_386_UNKNOWN27 */ {FLG_RE_NOTSUP, 0}, 79 /* R_386_UNKNOWN28 */ {FLG_RE_NOTSUP, 0}, 80 /* R_386_UNKNOWN29 */ {FLG_RE_NOTSUP, 0}, 81 /* R_386_UNKNOWN30 */ {FLG_RE_NOTSUP, 0}, 82 /* R_386_UNKNOWN31 */ {FLG_RE_NOTSUP, 0}, 83 /* R_386_TLS_LDO_32 */ {FLG_RE_TLSINS | FLG_RE_TLSLD, 4}, 84 /* R_386_UNKNOWN33 */ {FLG_RE_NOTSUP, 0}, 85 /* R_386_UNKNOWN34 */ {FLG_RE_NOTSUP, 0}, 86 /* R_386_TLS_DTPMOD32 */ {FLG_RE_NOTREL, 4}, 87 /* R_386_TLS_DTPOFF32 */ {FLG_RE_NOTREL, 4}, 88 /* R_386_UNKONWN37 */ {FLG_RE_NOTSUP, 0} 89 }; 90 91 /* 92 * Write a single relocated value to its reference location. 93 * We assume we wish to add the relocation amount, value, to the 94 * value of the address already present at the offset. 95 * 96 * NAME VALUE FIELD CALCULATION 97 * 98 * R_386_NONE 0 none none 99 * R_386_32 1 word32 S + A 100 * R_386_PC32 2 word32 S + A - P 101 * R_386_GOT32 3 word32 G + A - P 102 * R_386_PLT32 4 word32 L + A - P 103 * R_386_COPY 5 none none 104 * R_386_GLOB_DAT 6 word32 S 105 * R_386_JMP_SLOT 7 word32 S 106 * R_386_RELATIVE 8 word32 B + A 107 * R_386_GOTOFF 9 word32 S + A - GOT 108 * R_386_GOTPC 10 word32 GOT + A - P 109 * R_386_32PLT 11 word32 L + A 110 * R_386_TLS_GD_PLT 12 word32 @tlsgdplt 111 * R_386_TLS_LDM_PLT 13 word32 @tlsldmplt 112 * R_386_TLS_TPOFF 14 word32 @ntpoff(S) 113 * R_386_TLS_IE 15 word32 @indntpoff(S) 114 * R_386_TLS_GD 18 word32 @tlsgd(S) 115 * R_386_TLS_LDM 19 word32 @tlsldm(S) 116 * R_386_16 20 word16 S + A 117 * R_386_PC16 21 word16 S + A - P 118 * R_386_8 22 word8 S + A 119 * R_386_PC8 23 word8 S + A - P 120 * R_386_TLS_LDO_32 32 word32 @dtpoff(S) 121 * R_386_TLS_DTPMOD32 35 word32 @dtpmod(S) 122 * R_386_TLS_DTPOFF32 36 word32 @dtpoff(S) 123 * 124 * Relocations 0-10 are from Figure 4-4: Relocation Types from the 125 * intel ABI. Relocation 11 (R_386_32PLT) is from the C++ intel abi 126 * and is in the process of being registered with intel ABI (1/13/94). 127 * 128 * Relocations R_386_TLS_* are added to support Thread-Local storage 129 * as recorded in PSARC/2001/509 130 * 131 * Relocation calculations: 132 * 133 * CALCULATION uses the following notation: 134 * A the addend used 135 * B the base address of the shared object in memory 136 * G the offset into the global offset table 137 * GOT the address of teh global offset table 138 * L the procedure linkage entry 139 * P the place of the storage unit being relocated 140 * S the value of the symbol 141 * 142 * @dtlndx(x): Allocate two contiguous entries in the GOT table to hold 143 * a Tls_index structure (for passing to __tls_get_addr()). The 144 * instructions referencing this entry will be bound to the first 145 * of the two GOT entries. 146 * 147 * @tmndx(x): Allocate two contiguous entries in the GOT table to hold 148 * a Tls_index structure (for passing to __tls_get_addr()). The 149 * ti_offset field of the Tls_index will be set to 0 (zero) and the 150 * ti_module will be filled in at run-time. The call to 151 * __tls_get_addr() will return the starting offset of the dynamic 152 * TLS block. 153 * 154 * @dtpoff(x): calculate the tlsoffset relative to the TLS block. 155 * 156 * @tpoff(x): calculate the tlsoffset relative to the TLS block. 157 * 158 * @dtpmod(x): calculate the module id of the object containing symbol x. 159 * 160 * The calculations in the CALCULATION column are assumed to have 161 * been performed before calling this function except for the addition of 162 * the addresses in the instructions. 163 */ 164 int 165 do_reloc(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 166 const char *file) 167 { 168 const Rel_entry *rep; 169 170 rep = &reloc_table[rtype]; 171 172 switch (rep->re_fsize) { 173 case 1: 174 /* LINTED */ 175 *((uchar_t *)off) += (uchar_t)(*value); 176 break; 177 case 2: 178 /* LINTED */ 179 *((Half *)off) += (Half)(*value); 180 break; 181 case 4: 182 /* LINTED */ 183 *((Xword *)off) += *value; 184 break; 185 default: 186 /* 187 * To keep chkmsg() happy: MSG_INTL(MSG_REL_UNSUPSZ) 188 */ 189 REL_ERR_UNSUPSZ(file, sym, rtype, rep->re_fsize); 190 return (0); 191 } 192 return (1); 193 } 194