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 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 #include <stdio.h> 34 #include "sgs.h" 35 #include "machdep.h" 36 #include "libld.h" 37 #include "reloc.h" 38 #include "conv.h" 39 #include "msg.h" 40 #endif 41 42 /* 43 * This table represents the current relocations that do_reloc() is able to 44 * process. The relocations below that are marked SPECIAL are relocations that 45 * take special processing and shouldn't actually ever be passed to do_reloc(). 46 */ 47 const Rel_entry reloc_table[R_386_NUM] = { 48 /* R_386_NONE */ {FLG_RE_NOTREL, 0}, 49 /* R_386_32 */ {FLG_RE_NOTREL, 4}, 50 /* R_386_PC32 */ {FLG_RE_PCREL, 4}, 51 /* R_386_GOT32 */ {FLG_RE_GOTADD, 4}, 52 /* R_386_PLT32 */ {FLG_RE_PLTREL | FLG_RE_PCREL, 4}, 53 /* R_386_COPY */ {FLG_RE_NOTREL, 0}, /* SPECIAL */ 54 /* R_386_GLOB_DAT */ {FLG_RE_NOTREL, 4}, 55 /* R_386_JMP_SLOT */ {FLG_RE_NOTREL, 4}, /* SPECIAL */ 56 /* R_386_RELATIVE */ {FLG_RE_NOTREL, 4}, 57 /* R_386_GOTOFF */ {FLG_RE_GOTREL, 4}, 58 /* R_386_GOTPC */ {FLG_RE_PCREL | FLG_RE_GOTPC | FLG_RE_LOCLBND, 4}, 59 /* R_386_32PLT */ {FLG_RE_PLTREL, 4}, 60 /* R_386_TLS_GD_PLT */ {FLG_RE_PLTREL | FLG_RE_PCREL | FLG_RE_TLSGD, 4}, 61 /* R_386_TLS_LDM_PLT */ {FLG_RE_PLTREL | FLG_RE_PCREL | FLG_RE_TLSLD, 4}, 62 /* R_386_TLS_TPOFF */ {FLG_RE_NOTREL, 4}, 63 /* R_386_TLS_IE */ {FLG_RE_GOTADD | FLG_RE_TLSIE, 4}, 64 /* R_386_TLS_GOTIE */ {FLG_RE_GOTADD | FLG_RE_TLSIE, 4}, 65 /* R_386_TLS_LE */ {FLG_RE_TLSLE, 4}, 66 /* R_386_TLS_GD */ {FLG_RE_GOTADD | FLG_RE_TLSGD, 4}, 67 /* R_386_TLS_LDM */ {FLG_RE_GOTADD | FLG_RE_TLSLD, 4}, 68 /* R_386_16 */ {FLG_RE_NOTREL, 2}, 69 /* R_386_PC16 */ {FLG_RE_PCREL, 2}, 70 /* R_386_8 */ {FLG_RE_NOTREL, 1}, 71 /* R_386_PC8 */ {FLG_RE_PCREL, 1}, 72 /* R_386_UNKNOWN24 */ {FLG_RE_NOTSUP, 0}, 73 /* R_386_UNKNOWN25 */ {FLG_RE_NOTSUP, 0}, 74 /* R_386_UNKNOWN26 */ {FLG_RE_NOTSUP, 0}, 75 /* R_386_UNKNOWN27 */ {FLG_RE_NOTSUP, 0}, 76 /* R_386_UNKNOWN28 */ {FLG_RE_NOTSUP, 0}, 77 /* R_386_UNKNOWN29 */ {FLG_RE_NOTSUP, 0}, 78 /* R_386_UNKNOWN30 */ {FLG_RE_NOTSUP, 0}, 79 /* R_386_UNKNOWN31 */ {FLG_RE_NOTSUP, 0}, 80 /* R_386_TLS_LDO_32 */ {FLG_RE_TLSLD, 4}, 81 /* R_386_UNKNOWN33 */ {FLG_RE_NOTSUP, 0}, 82 /* R_386_UNKNOWN34 */ {FLG_RE_NOTSUP, 0}, 83 /* R_386_TLS_DTPMOD32 */ {FLG_RE_NOTREL, 4}, 84 /* R_386_TLS_DTPOFF32 */ {FLG_RE_NOTREL, 4}, 85 /* R_386_UNKONWN37 */ {FLG_RE_NOTSUP, 0} 86 }; 87 88 /* 89 * Write a single relocated value to its reference location. 90 * We assume we wish to add the relocation amount, value, to the 91 * value of the address already present at the offset. 92 * 93 * NAME VALUE FIELD CALCULATION 94 * 95 * R_386_NONE 0 none none 96 * R_386_32 1 word32 S + A 97 * R_386_PC32 2 word32 S + A - P 98 * R_386_GOT32 3 word32 G + A - P 99 * R_386_PLT32 4 word32 L + A - P 100 * R_386_COPY 5 none none 101 * R_386_GLOB_DAT 6 word32 S 102 * R_386_JMP_SLOT 7 word32 S 103 * R_386_RELATIVE 8 word32 B + A 104 * R_386_GOTOFF 9 word32 S + A - GOT 105 * R_386_GOTPC 10 word32 GOT + A - P 106 * R_386_32PLT 11 word32 L + A 107 * R_386_TLS_GD_PLT 12 word32 @tlsgdplt 108 * R_386_TLS_LDM_PLT 13 word32 @tlsldmplt 109 * R_386_TLS_TPOFF 14 word32 @ntpoff(S) 110 * R_386_TLS_IE 15 word32 @indntpoff(S) 111 * R_386_TLS_GD 18 word32 @tlsgd(S) 112 * R_386_TLS_LDM 19 word32 @tlsldm(S) 113 * R_386_16 20 word16 S + A 114 * R_386_PC16 21 word16 S + A - P 115 * R_386_8 22 word8 S + A 116 * R_386_PC8 23 word8 S + A - P 117 * R_386_TLS_LDO_32 32 word32 @dtpoff(S) 118 * R_386_TLS_DTPMOD32 35 word32 @dtpmod(S) 119 * R_386_TLS_DTPOFF32 36 word32 @dtpoff(S) 120 * 121 * Relocations 0-10 are from Figure 4-4: Relocation Types from the 122 * intel ABI. Relocation 11 (R_386_32PLT) is from the C++ intel abi 123 * and is in the process of being registered with intel ABI (1/13/94). 124 * 125 * Relocations R_386_TLS_* are added to support Thread-Local storage 126 * as recorded in PSARC/2001/509 127 * 128 * Relocation calculations: 129 * 130 * CALCULATION uses the following notation: 131 * A the addend used 132 * B the base address of the shared object in memory 133 * G the offset into the global offset table 134 * GOT the address of teh global offset table 135 * L the procedure linkage entry 136 * P the place of the storage unit being relocated 137 * S the value of the symbol 138 * 139 * @dtlndx(x): Allocate two contiguous entries in the GOT table to hold 140 * a Tls_index structure (for passing to __tls_get_addr()). The 141 * instructions referencing this entry will be bound to the first 142 * of the two GOT entries. 143 * 144 * @tmndx(x): Allocate two contiguous entries in the GOT table to hold 145 * a Tls_index structure (for passing to __tls_get_addr()). The 146 * ti_offset field of the Tls_index will be set to 0 (zero) and the 147 * ti_module will be filled in at run-time. The call to 148 * __tls_get_addr() will return the starting offset of the dynamic 149 * TLS block. 150 * 151 * @dtpoff(x): calculate the tlsoffset relative to the TLS block. 152 * 153 * @tpoff(x): calculate the tlsoffset relative to the TLS block. 154 * 155 * @dtpmod(x): calculate the module id of the object containing symbol x. 156 * 157 * The calculations in the CALCULATION column are assumed to have 158 * been performed before calling this function except for the addition of 159 * the addresses in the instructions. 160 */ 161 /* ARGSUSED5 */ 162 int 163 do_reloc(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 164 const char *file, void *lml) 165 { 166 const Rel_entry *rep; 167 168 rep = &reloc_table[rtype]; 169 170 switch (rep->re_fsize) { 171 case 1: 172 /* LINTED */ 173 *((uchar_t *)off) += (uchar_t)(*value); 174 break; 175 case 2: 176 /* LINTED */ 177 *((Half *)off) += (Half)(*value); 178 break; 179 case 4: 180 /* LINTED */ 181 *((Xword *)off) += *value; 182 break; 183 default: 184 /* 185 * To keep chkmsg() happy: MSG_INTL(MSG_REL_UNSUPSZ) 186 */ 187 REL_ERR_UNSUPSZ(lml, file, sym, rtype, rep->re_fsize); 188 return (0); 189 } 190 return (1); 191 } 192