OpenBSD-4.6/libexec/ld.so/sh/rtld_machine.c
/* $OpenBSD: rtld_machine.c,v 1.13 2008/07/24 23:42:26 guenther Exp $ */
/*
* Copyright (c) 2004 Dale Rahn
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#define _DYN_LOADER
#define LDSO_ARCH_IS_RELA_
#include <sys/types.h>
#include <sys/mman.h>
#include <nlist.h>
#include <link.h>
#include <signal.h>
#include "syscall.h"
#include "archdep.h"
#include "resolve.h"
void _dl_bind_start(void); /* XXX */
Elf_Addr _dl_bind(elf_object_t *object, int reloff);
#define _RF_S 0x80000000 /* Resolve symbol */
#define _RF_A 0x40000000 /* Use addend */
#define _RF_P 0x20000000 /* Location relative */
#define _RF_G 0x10000000 /* GOT offset */
#define _RF_B 0x08000000 /* Load address relative */
#define _RF_U 0x04000000 /* Unaligned */
#define _RF_E 0x02000000 /* ERROR */
#define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */
#define _RF_RS(s) ((s) & 0xff) /* right shift */
static int reloc_target_flags[] = {
0, /* 0 R_SH_NONE */
_RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 1 R_SH_DIR32 */
_RF_S|_RF_P|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 2 REL32 */
_RF_E, /* 3 R_SH_DIR8WPN */
_RF_E, /* 4 R_SH_IND12W */
_RF_E, /* 5 R_SH_DIR8WPL */
_RF_E, /* 6 R_SH_DIR8WPZ */
_RF_E, /* 7 R_SH_DIR8BP */
_RF_E, /* 8 R_SH_DIR8W */
_RF_E, /* 9 R_SH_DIR8L */
_RF_E, /* 10 R_SH_LOOP_START */
_RF_E, /* 11 R_SH_LOOP_END */
_RF_E, /* 12 Unused */
_RF_E, /* 13 Unused */
_RF_E, /* 14 Unused */
_RF_E, /* 15 Unused */
_RF_E, /* 16 Unused */
_RF_E, /* 17 Unused */
_RF_E, /* 18 Unused */
_RF_E, /* 19 Unused */
_RF_E, /* 20 Unused */
_RF_E, /* 21 Unused */
_RF_E, /* 22 R_SH_GNU_VTINHERIT */
_RF_E, /* 23 R_SH_GNU_VTENTRY */
_RF_E, /* 24 R_SH_SWITCH8 */
_RF_E, /* 25 R_SH_SWITCH16 */
_RF_E, /* 26 R_SH_SWITCH32 */
_RF_E, /* 27 R_SH_USES */
_RF_E, /* 28 R_SH_COUNT */
_RF_E, /* 29 R_SH_ALIGN */
_RF_E, /* 30 R_SH_CODE */
_RF_E, /* 31 R_SH_DATA */
_RF_E, /* 32 R_SH_LABEL */
_RF_E, /* 33 R_SH_DIR16 */
_RF_E, /* 34 R_SH_DIR8 */
_RF_E, /* 35 R_SH_DIR8UL */
_RF_E, /* 36 R_SH_DIR8UW */
_RF_E, /* 37 R_SH_DIR8U */
_RF_E, /* 38 R_SH_DIR8SW */
_RF_E, /* 39 R_SH_DIR8S */
_RF_E, /* 40 R_SH_DIR4UL */
_RF_E, /* 41 R_SH_DIR4UW */
_RF_E, /* 42 R_SH_DIR4U */
_RF_E, /* 43 R_SH_PSHA */
_RF_E, /* 44 R_SH_PSHL */
_RF_E, /* 45 R_SH_DIR5U */
_RF_E, /* 46 R_SH_DIR6U */
_RF_E, /* 47 R_SH_DIR6S */
_RF_E, /* 48 R_SH_DIR10S */
_RF_E, /* 49 R_SH_DIR10SW */
_RF_E, /* 50 R_SH_DIR10SL */
_RF_E, /* 51 R_SH_DIR10SQ */
_RF_E, /* 52 XXXX */
_RF_E, /* 53 R_SH_DIR16S */
_RF_E, /* 54 Unused */
_RF_E, /* 55 Unused */
_RF_E, /* 56 Unused */
_RF_E, /* 57 Unused */
_RF_E, /* 58 Unused */
_RF_E, /* 59 Unused */
_RF_E, /* 60 Unused */
_RF_E, /* 61 Unused */
_RF_E, /* 62 Unused */
_RF_E, /* 63 Unused */
_RF_E, /* 64 Unused */
_RF_E, /* 65 Unused */
_RF_E, /* 66 Unused */
_RF_E, /* 67 Unused */
_RF_E, /* 68 Unused */
_RF_E, /* 69 Unused */
_RF_E, /* 70 Unused */
_RF_E, /* 71 Unused */
_RF_E, /* 72 Unused */
_RF_E, /* 73 Unused */
_RF_E, /* 74 Unused */
_RF_E, /* 75 Unused */
_RF_E, /* 76 Unused */
_RF_E, /* 77 Unused */
_RF_E, /* 78 Unused */
_RF_E, /* 79 Unused */
_RF_E, /* 80 Unused */
_RF_E, /* 81 Unused */
_RF_E, /* 82 Unused */
_RF_E, /* 83 Unused */
_RF_E, /* 84 Unused */
_RF_E, /* 85 Unused */
_RF_E, /* 86 Unused */
_RF_E, /* 87 Unused */
_RF_E, /* 88 Unused */
_RF_E, /* 89 Unused */
_RF_E, /* 90 Unused */
_RF_E, /* 91 Unused */
_RF_E, /* 92 Unused */
_RF_E, /* 93 Unused */
_RF_E, /* 94 Unused */
_RF_E, /* 95 Unused */
_RF_E, /* 96 Unused */
_RF_E, /* 97 Unused */
_RF_E, /* 98 Unused */
_RF_E, /* 99 Unused */
_RF_E, /* 100 Unused */
_RF_E, /* 101 Unused */
_RF_E, /* 102 Unused */
_RF_E, /* 103 Unused */
_RF_E, /* 104 Unused */
_RF_E, /* 105 Unused */
_RF_E, /* 106 Unused */
_RF_E, /* 107 Unused */
_RF_E, /* 108 Unused */
_RF_E, /* 109 Unused */
_RF_E, /* 110 Unused */
_RF_E, /* 111 Unused */
_RF_E, /* 112 Unused */
_RF_E, /* 113 Unused */
_RF_E, /* 114 Unused */
_RF_E, /* 115 Unused */
_RF_E, /* 116 Unused */
_RF_E, /* 117 Unused */
_RF_E, /* 118 Unused */
_RF_E, /* 119 Unused */
_RF_E, /* 120 Unused */
_RF_E, /* 121 Unused */
_RF_E, /* 122 Unused */
_RF_E, /* 123 Unused */
_RF_E, /* 124 Unused */
_RF_E, /* 125 Unused */
_RF_E, /* 126 Unused */
_RF_E, /* 127 Unused */
_RF_E, /* 128 Unused */
_RF_E, /* 129 Unused */
_RF_E, /* 130 Unused */
_RF_E, /* 131 Unused */
_RF_E, /* 132 Unused */
_RF_E, /* 133 Unused */
_RF_E, /* 134 Unused */
_RF_E, /* 135 Unused */
_RF_E, /* 136 Unused */
_RF_E, /* 137 Unused */
_RF_E, /* 138 Unused */
_RF_E, /* 139 Unused */
_RF_E, /* 140 Unused */
_RF_E, /* 141 Unused */
_RF_E, /* 142 Unused */
_RF_E, /* 143 Unused */
_RF_E, /* 144 R_SH_TLS_GD_32 */
_RF_E, /* 145 R_SH_TLS_LD_32 */
_RF_E, /* 146 R_SH_TLS_LDO_32 */
_RF_E, /* 147 R_SH_TLS_IE_32 */
_RF_E, /* 148 R_SH_TLS_LE_32 */
_RF_E, /* 149 R_SH_TLS_DTPMOD32 */
_RF_E, /* 150 R_SH_TLS_DTPOFF32 */
_RF_E, /* 151 R_SH_TLS_TPOFF32 */
_RF_E, /* 152 Unused */
_RF_E, /* 153 Unused */
_RF_E, /* 154 Unused */
_RF_E, /* 155 Unused */
_RF_E, /* 156 Unused */
_RF_E, /* 157 Unused */
_RF_E, /* 158 Unused */
_RF_E, /* 159 Unused */
_RF_E, /* 160 R_SH_GOT32 */
_RF_E, /* 161 R_SH_PLT32 */
_RF_S| _RF_SZ(32) | _RF_RS(0), /* 162 COPY */
_RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 163 GLOB_DAT */
_RF_S| _RF_SZ(32) | _RF_RS(0), /* 164 JMP_SLOT */
_RF_A| _RF_B| _RF_SZ(32) | _RF_RS(0), /* 165 RELATIVE */
_RF_E, /* 166 R_SH_GOTOFF */
_RF_E, /* 167 R_SH_GOTPC */
_RF_E, /* 168 R_SH_GOTPLT32 */
_RF_E, /* 169 R_SH_GOT_LOW16 */
_RF_E, /* 170 R_SH_GOT_MEDLOW16 */
_RF_E, /* 171 R_SH_GOT_MEDHI16 */
_RF_E, /* 172 R_SH_GOT_HI16 */
_RF_E, /* 173 R_SH_GOTPLT_LOW16 */
_RF_E, /* 174 R_SH_GOTPLT_MEDLOW16 */
_RF_E, /* 175 R_SH_GOTPLT_MEDHI16 */
_RF_E, /* 176 R_SH_GOTPLT_HI16 */
_RF_E, /* 177 R_SH_PLT_LOW16 */
_RF_E, /* 178 R_SH_PLT_MEDLOW16 */
_RF_E, /* 179 R_SH_PLT_MEDHI16 */
_RF_E, /* 180 R_SH_PLT_HI16 */
_RF_E, /* 181 R_SH_GOTOFF_LOW16 */
_RF_E, /* 182 R_SH_GOTOFF_MEDLOW16 */
_RF_E, /* 183 R_SH_GOTOFF_MEDHI16 */
_RF_E, /* 184 R_SH_GOTOFF_HI16 */
_RF_E, /* 185 R_SH_GOTPC_LOW16 */
_RF_E, /* 186 R_SH_GOTPC_MEDLOW16 */
_RF_E, /* 187 R_SH_GOTPC_MEDHI16 */
_RF_E, /* 188 R_SH_GOTPC_HI16 */
_RF_E, /* 189 R_SH_GOT10BY4 */
_RF_E, /* 190 R_SH_GOTPLT10BY4 */
_RF_E, /* 191 R_SH_GOT10BY8 */
_RF_E, /* 192 R_SH_GOTPLT10BY8 */
#ifdef SH_SUPPORT_64_BIT
_RF_E, /* 193 R_SH_COPY64 */
_RF_E, /* 194 R_SH_GLOB_DAT64 */
_RF_E, /* 195 R_SH_JMP_SLOT64 */
_RF_E, /* 196 R_SH_RELATIVE64 */
_RF_E, /* 197 Unused */
_RF_E, /* 198 Unused */
_RF_E, /* 199 Unused */
_RF_E, /* 200 Unused */
_RF_E, /* 201 Unused */
_RF_E, /* 202 Unused */
_RF_E, /* 203 Unused */
_RF_E, /* 204 Unused */
_RF_E, /* 205 Unused */
_RF_E, /* 206 Unused */
_RF_E, /* 207 Unused */
_RF_E, /* 208 Unused */
_RF_E, /* 209 Unused */
_RF_E, /* 210 Unused */
_RF_E, /* 211 Unused */
_RF_E, /* 212 Unused */
_RF_E, /* 213 Unused */
_RF_E, /* 214 Unused */
_RF_E, /* 215 Unused */
_RF_E, /* 216 Unused */
_RF_E, /* 217 Unused */
_RF_E, /* 218 Unused */
_RF_E, /* 219 Unused */
_RF_E, /* 220 Unused */
_RF_E, /* 221 Unused */
_RF_E, /* 222 Unused */
_RF_E, /* 223 Unused */
_RF_E, /* 224 Unused */
_RF_E, /* 225 Unused */
_RF_E, /* 226 Unused */
_RF_E, /* 227 Unused */
_RF_E, /* 228 Unused */
_RF_E, /* 229 Unused */
_RF_E, /* 230 Unused */
_RF_E, /* 231 Unused */
_RF_E, /* 232 Unused */
_RF_E, /* 233 Unused */
_RF_E, /* 234 Unused */
_RF_E, /* 235 Unused */
_RF_E, /* 236 Unused */
_RF_E, /* 237 Unused */
_RF_E, /* 238 Unused */
_RF_E, /* 239 Unused */
_RF_E, /* 240 Unused */
_RF_E, /* 241 Unused */
_RF_E, /* 242 R_SH_SHMEDIA_CODE */
_RF_E, /* 243 R_SH_PT_16 */
_RF_E, /* 244 R_SH_IMMS16 */
_RF_E, /* 245 R_SH_IMMU16 */
_RF_E, /* 246 R_SH_IMM_LOW16 */
_RF_E, /* 247 R_SH_IMM_LOW16_PCREL */
_RF_E, /* 248 R_SH_IMM_MEDLOW16 */
_RF_E, /* 249 R_SH_IMM_MEDLOW16_PCREL */
_RF_E, /* 250 R_SH_IMM_MEDHI16 */
_RF_E, /* 251 R_SH_IMM_MEDHI16_PCREL */
_RF_E, /* 252 R_SH_IMM_HI16 */
_RF_E, /* 253 R_SH_IMM_HI16_PCREL */
_RF_E, /* 254 R_SH_64 */
_RF_E, /* 255 R_SH_64_PCREL */
0
#endif
};
#define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0)
#define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0)
#define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0)
#define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0)
#define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0)
#define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff)
#define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff)
static int reloc_target_bitmask[] = {
#define _BM(x) (x == 32? ~0 : ~(-(1UL << (x))))
_BM(0), /* 0 R_SH_NONE */
_BM(32), /* 1 R_SH_DIR32 */
_BM(32), /* 2 R_SH_REL32 */
_BM(8), /* 3 R_SH_DIR8WPN */
_BM(12), /* 4 R_SH_IND12W */
_BM(8), /* 5 R_SH_DIR8WPL */
_BM(8), /* 6 R_SH_DIR8WPZ */
_BM(8), /* 7 R_SH_DIR8BP */
_BM(8), /* 8 R_SH_DIR8W */
_BM(8), /* 9 R_SH_DIR8L */
_BM(0), /* 10 R_SH_LOOP_START */
_BM(0), /* 11 R_SH_LOOP_END */
_BM(0), /* 12 Unused */
_BM(0), /* 13 Unused */
_BM(0), /* 14 Unused */
_BM(0), /* 15 Unused */
_BM(0), /* 16 Unused */
_BM(0), /* 17 Unused */
_BM(0), /* 18 Unused */
_BM(0), /* 19 Unused */
_BM(0), /* 20 Unused */
_BM(0), /* 21 Unused */
_BM(0), /* 22 R_SH_GNU_VTINHERIT */
_BM(0), /* 23 R_SH_GNU_VTENTRY */
_BM(0), /* 24 R_SH_SWITCH8 */
_BM(0), /* 25 R_SH_SWITCH16 */
_BM(0), /* 26 R_SH_SWITCH32 */
_BM(0), /* 27 R_SH_USES */
_BM(0), /* 28 R_SH_COUNT */
_BM(0), /* 29 R_SH_ALIGN */
_BM(0), /* 30 R_SH_CODE */
_BM(0), /* 31 R_SH_DATA */
_BM(0), /* 32 R_SH_LABEL */
_BM(0), /* 33 R_SH_DIR16 */
_BM(0), /* 34 R_SH_DIR8 */
_BM(0), /* 35 R_SH_DIR8UL */
_BM(0), /* 36 R_SH_DIR8UW */
_BM(0), /* 37 R_SH_DIR8U */
_BM(0), /* 38 R_SH_DIR8SW */
_BM(0), /* 39 R_SH_DIR8S */
_BM(0), /* 40 R_SH_DIR4UL */
_BM(0), /* 41 R_SH_DIR4UW */
_BM(0), /* 42 R_SH_DIR4U */
_BM(0), /* 43 R_SH_PSHA */
_BM(0), /* 44 R_SH_PSHL */
_BM(0), /* 45 R_SH_DIR5U */
_BM(0), /* 46 R_SH_DIR6U */
_BM(0), /* 47 R_SH_DIR6S */
_BM(0), /* 48 R_SH_DIR10S */
_BM(0), /* 49 R_SH_DIR10SW */
_BM(0), /* 50 R_SH_DIR10SL */
_BM(0), /* 51 R_SH_DIR10SQ */
_BM(0), /* 52 xxx */
_BM(0), /* 53 R_SH_DIR16S */
_BM(0), /* 54 Unused */
_BM(0), /* 55 Unused */
_BM(0), /* 56 Unused */
_BM(0), /* 57 Unused */
_BM(0), /* 58 Unused */
_BM(0), /* 59 Unused */
_BM(0), /* 60 Unused */
_BM(0), /* 61 Unused */
_BM(0), /* 62 Unused */
_BM(0), /* 63 Unused */
_BM(0), /* 64 Unused */
_BM(0), /* 65 Unused */
_BM(0), /* 66 Unused */
_BM(0), /* 67 Unused */
_BM(0), /* 68 Unused */
_BM(0), /* 69 Unused */
_BM(0), /* 70 Unused */
_BM(0), /* 71 Unused */
_BM(0), /* 72 Unused */
_BM(0), /* 73 Unused */
_BM(0), /* 74 Unused */
_BM(0), /* 75 Unused */
_BM(0), /* 76 Unused */
_BM(0), /* 77 Unused */
_BM(0), /* 78 Unused */
_BM(0), /* 79 Unused */
_BM(0), /* 80 Unused */
_BM(0), /* 81 Unused */
_BM(0), /* 82 Unused */
_BM(0), /* 83 Unused */
_BM(0), /* 84 Unused */
_BM(0), /* 85 Unused */
_BM(0), /* 86 Unused */
_BM(0), /* 87 Unused */
_BM(0), /* 88 Unused */
_BM(0), /* 89 Unused */
_BM(0), /* 90 Unused */
_BM(0), /* 91 Unused */
_BM(0), /* 92 Unused */
_BM(0), /* 93 Unused */
_BM(0), /* 94 Unused */
_BM(0), /* 95 Unused */
_BM(0), /* 96 Unused */
_BM(0), /* 97 Unused */
_BM(0), /* 98 Unused */
_BM(0), /* 99 Unused */
_BM(0), /* 100 Unused */
_BM(0), /* 101 Unused */
_BM(0), /* 102 Unused */
_BM(0), /* 103 Unused */
_BM(0), /* 104 Unused */
_BM(0), /* 105 Unused */
_BM(0), /* 106 Unused */
_BM(0), /* 107 Unused */
_BM(0), /* 108 Unused */
_BM(0), /* 109 Unused */
_BM(0), /* 110 Unused */
_BM(0), /* 111 Unused */
_BM(0), /* 112 Unused */
_BM(0), /* 113 Unused */
_BM(0), /* 114 Unused */
_BM(0), /* 115 Unused */
_BM(0), /* 116 Unused */
_BM(0), /* 117 Unused */
_BM(0), /* 118 Unused */
_BM(0), /* 119 Unused */
_BM(0), /* 120 Unused */
_BM(0), /* 121 Unused */
_BM(0), /* 122 Unused */
_BM(0), /* 123 Unused */
_BM(0), /* 124 Unused */
_BM(0), /* 125 Unused */
_BM(0), /* 126 Unused */
_BM(0), /* 127 Unused */
_BM(0), /* 128 Unused */
_BM(0), /* 129 Unused */
_BM(0), /* 130 Unused */
_BM(0), /* 131 Unused */
_BM(0), /* 132 Unused */
_BM(0), /* 133 Unused */
_BM(0), /* 134 Unused */
_BM(0), /* 135 Unused */
_BM(0), /* 136 Unused */
_BM(0), /* 137 Unused */
_BM(0), /* 138 Unused */
_BM(0), /* 139 Unused */
_BM(0), /* 140 Unused */
_BM(0), /* 141 Unused */
_BM(0), /* 142 Unused */
_BM(0), /* 143 Unused */
_BM(0), /* 144 R_SH_TLS_GD_32 */
_BM(0), /* 145 R_SH_TLS_LD_32 */
_BM(0), /* 146 R_SH_TLS_LDO_32 */
_BM(0), /* 147 R_SH_TLS_IE_32 */
_BM(0), /* 148 R_SH_TLS_LE_32 */
_BM(0), /* 149 R_SH_TLS_DTPMOD32 */
_BM(0), /* 150 R_SH_TLS_DTPOFF32 */
_BM(0), /* 151 R_SH_TLS_TPOFF32 */
_BM(0), /* 152 xxx */
_BM(0), /* 153 xxx */
_BM(0), /* 154 xxx */
_BM(0), /* 155 xxx */
_BM(0), /* 156 xxx */
_BM(0), /* 157 xxx */
_BM(0), /* 158 xxx */
_BM(0), /* 159 xxx */
_BM(0), /* 160 R_SH_GOT32 */
_BM(0), /* 161 R_SH_PLT32 */
_BM(0), /* 162 R_SH_COPY */
_BM(32), /* 163 R_SH_GLOB_DAT */
_BM(0), /* 164 R_SH_JMP_SLOT */
_BM(32), /* 165 R_SH_RELATIVE */
_BM(0), /* 166 R_SH_GOTOFF */
_BM(0), /* 167 R_SH_GOTPC */
_BM(0), /* 168 R_SH_GOTPLT32 */
_BM(0), /* 169 R_SH_GOT_LOW16 */
_BM(0), /* 170 R_SH_GOT_MEDLOW16 */
_BM(0), /* 171 R_SH_GOT_MEDHI16 */
_BM(0), /* 172 R_SH_GOT_HI16 */
_BM(0), /* 173 R_SH_GOTPLT_LOW16 */
_BM(0), /* 174 R_SH_GOTPLT_MEDLOW16 */
_BM(0), /* 175 R_SH_GOTPLT_MEDHI16 */
_BM(0), /* 176 R_SH_GOTPLT_HI16 */
_BM(0), /* 177 R_SH_PLT_LOW16 */
_BM(0), /* 178 R_SH_PLT_MEDLOW16 */
_BM(0), /* 179 R_SH_PLT_MEDHI16 */
_BM(0), /* 180 R_SH_PLT_HI16 */
_BM(0), /* 181 R_SH_GOTOFF_LOW16 */
_BM(0), /* 182 R_SH_GOTOFF_MEDLOW16 */
_BM(0), /* 183 R_SH_GOTOFF_MEDHI16 */
_BM(0), /* 184 R_SH_GOTOFF_HI16 */
_BM(0), /* 185 R_SH_GOTPC_LOW16 */
_BM(0), /* 186 R_SH_GOTPC_MEDLOW16 */
_BM(0), /* 187 R_SH_GOTPC_MEDHI16 */
_BM(0), /* 188 R_SH_GOTPC_HI16 */
_BM(0), /* 189 R_SH_GOT10BY4 */
_BM(0), /* 190 R_SH_GOTPLT10BY4 */
_BM(0), /* 191 R_SH_GOT10BY8 */
_BM(0), /* 192 R_SH_GOTPLT10BY8 */
#ifdef SH_SUPPORT_64_BIT
_BM(0), /* 193 R_SH_COPY64 */
_BM(0), /* 194 R_SH_GLOB_DAT64 */
_BM(0), /* 195 R_SH_JMP_SLOT64 */
_BM(0), /* 196 R_SH_RELATIVE64 */
_BM(0), /* 197 xxx */
_BM(0), /* 198 xxx */
_BM(0), /* 199 xxx */
_BM(0), /* 200 xxx */
_BM(0), /* 201 xxx */
_BM(0), /* 202 xxx */
_BM(0), /* 203 xxx */
_BM(0), /* 204 xxx */
_BM(0), /* 205 xxx */
_BM(0), /* 206 xxx */
_BM(0), /* 207 xxx */
_BM(0), /* 208 xxx */
_BM(0), /* 209 xxx */
_BM(0), /* 210 xxx */
_BM(0), /* 211 xxx */
_BM(0), /* 212 xxx */
_BM(0), /* 213 xxx */
_BM(0), /* 214 xxx */
_BM(0), /* 215 xxx */
_BM(0), /* 216 xxx */
_BM(0), /* 217 xxx */
_BM(0), /* 218 xxx */
_BM(0), /* 219 xxx */
_BM(0), /* 220 xxx */
_BM(0), /* 221 xxx */
_BM(0), /* 222 xxx */
_BM(0), /* 223 xxx */
_BM(0), /* 224 xxx */
_BM(0), /* 225 xxx */
_BM(0), /* 226 xxx */
_BM(0), /* 227 xxx */
_BM(0), /* 228 xxx */
_BM(0), /* 229 xxx */
_BM(0), /* 230 xxx */
_BM(0), /* 231 xxx */
_BM(0), /* 232 xxx */
_BM(0), /* 233 xxx */
_BM(0), /* 234 xxx */
_BM(0), /* 235 xxx */
_BM(0), /* 236 xxx */
_BM(0), /* 237 xxx */
_BM(0), /* 238 xxx */
_BM(0), /* 239 xxx */
_BM(0), /* 240 xxx */
_BM(0), /* 241 xxx */
_BM(0), /* 242 R_SH_SHMEDIA_CODE */
_BM(0), /* 243 R_SH_PT_16 */
_BM(0), /* 244 R_SH_IMMS16 */
_BM(0), /* 245 R_SH_IMMU16 */
_BM(0), /* 246 R_SH_IMM_LOW16 */
_BM(0), /* 247 R_SH_IMM_LOW16_PCREL */
_BM(0), /* 248 R_SH_IMM_MEDLOW16 */
_BM(0), /* 249 R_SH_IMM_MEDLOW16_PCREL */
_BM(0), /* 250 R_SH_IMM_MEDHI16 */
_BM(0), /* 251 R_SH_IMM_MEDHI16_PCREL */
_BM(0), /* 252 R_SH_IMM_HI16 */
_BM(0), /* 253 R_SH_IMM_HI16_PCREL */
_BM(0), /* 254 R_SH_64 */
_BM(0), /* 255 R_SH_64_PCREL */
#endif
#undef _BM
};
#define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t])
#define R_TYPE(x) R_SH_ ## x
void _dl_reloc_plt(Elf_Word *where, Elf_Addr value, Elf_RelA *rel);
void
_dl_reloc_plt(Elf_Word *where, Elf_Addr value, Elf_RelA *rel)
{
*where = value + rel->r_addend;
}
int
_dl_md_reloc(elf_object_t *object, int rel, int relasz)
{
long i;
long numrela;
int fails = 0;
Elf_Addr loff;
Elf_RelA *rels;
struct load_list *llist;
loff = object->obj_base;
numrela = object->Dyn.info[relasz] / sizeof(Elf_RelA);
rels = (Elf_RelA *)(object->Dyn.info[rel]);
if (rels == NULL)
return(0);
/*
* unprotect some segments if we need it.
*/
if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list;
llist != NULL;
llist = llist->next) {
if (!(llist->prot & PROT_WRITE))
_dl_mprotect(llist->start, llist->size,
llist->prot|PROT_WRITE);
}
}
for (i = 0; i < numrela; i++, rels++) {
Elf_Addr *where, value, ooff, mask;
Elf_Word type;
const Elf_Sym *sym, *this;
const char *symn;
type = ELF_R_TYPE(rels->r_info);
if (reloc_target_flags[type] & _RF_E) {
_dl_printf(" bad relocation obj %s %d %d\n", object->load_name, i, type);
_dl_exit(1);
}
if (type == R_TYPE(NONE))
continue;
if (type == R_TYPE(JMP_SLOT) && rel != DT_JMPREL)
continue;
where = (Elf_Addr *)(rels->r_offset + loff);
if (RELOC_USE_ADDEND(type))
#ifdef LDSO_ARCH_IS_RELA_
value = rels->r_addend;
#else
value = *where & RELOC_VALUE_BITMASK(type);
#endif
else
value = 0;
sym = NULL;
symn = NULL;
if (RELOC_RESOLVE_SYMBOL(type)) {
sym = object->dyn.symtab;
sym += ELF_R_SYM(rels->r_info);
symn = object->dyn.strtab + sym->st_name;
if (sym->st_shndx != SHN_UNDEF &&
ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
value += loff;
} else {
this = NULL;
#if 1
ooff = _dl_find_symbol_bysym(object,
ELF_R_SYM(rels->r_info), &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
((type == R_TYPE(JMP_SLOT)) ?
SYM_PLT : SYM_NOTPLT),
sym, NULL);
#else
ooff = _dl_find_symbol_bysym(object,
ELF_R_SYM(rels->r_info), &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
SYM_PLT,
sym, NULL);
#endif
if (this == NULL) {
resolve_failed:
if (ELF_ST_BIND(sym->st_info) !=
STB_WEAK)
fails++;
continue;
}
value += (Elf_Addr)(ooff + this->st_value);
}
}
if (type == R_TYPE(JMP_SLOT)) {
_dl_reloc_plt((Elf_Word *)where, value, rels);
continue;
}
if (type == R_TYPE(COPY)) {
void *dstaddr = where;
const void *srcaddr;
const Elf_Sym *dstsym = sym, *srcsym = NULL;
Elf_Addr soff;
soff = _dl_find_symbol(symn, &srcsym,
SYM_SEARCH_OTHER|SYM_WARNNOTFOUND|SYM_NOTPLT,
dstsym, object, NULL);
if (srcsym == NULL)
goto resolve_failed;
srcaddr = (void *)(soff + srcsym->st_value);
_dl_bcopy(srcaddr, dstaddr, dstsym->st_size);
continue;
}
if (RELOC_PC_RELATIVE(type))
value -= (Elf_Addr)where;
if (RELOC_BASE_RELATIVE(type))
value += loff;
mask = RELOC_VALUE_BITMASK(type);
value >>= RELOC_VALUE_RIGHTSHIFT(type);
value &= mask;
if (RELOC_UNALIGNED(type)) {
/* Handle unaligned relocations. */
Elf_Addr tmp = 0;
char *ptr = (char *)where;
int i, size = RELOC_TARGET_SIZE(type)/8;
/* Read it in one byte at a time. */
for (i=0; i<size; i++)
tmp = (tmp << 8) | ptr[i];
tmp &= ~mask;
tmp |= value;
/* Write it back out. */
for (i=0; i<size; i++)
ptr[i] = ((tmp >> (8*i)) & 0xff);
} else {
*where &= ~mask;
*where |= value;
}
}
/* reprotect the unprotected segments */
if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list;
llist != NULL;
llist = llist->next) {
if (!(llist->prot & PROT_WRITE))
_dl_mprotect(llist->start, llist->size,
llist->prot);
}
}
return (fails);
}
/*
* Relocate the Global Offset Table (GOT).
* This is done by calling _dl_md_reloc on DT_JUMPREL for DL_BIND_NOW,
* otherwise the lazy binding plt initialization is performed.
*/
int
_dl_md_reloc_got(elf_object_t *object, int lazy)
{
int fails = 0;
Elf_Addr *pltgot = (Elf_Addr *)object->Dyn.info[DT_PLTGOT];
Elf_Addr ooff;
const Elf_Sym *this;
int i, num;
Elf_Rel *rel;
/* XXX - lazy binding not supported yet */
lazy = 0;
if (object->Dyn.info[DT_PLTREL] != DT_RELA)
return (0);
object->got_addr = NULL;
object->got_size = 0;
this = NULL;
ooff = _dl_find_symbol("__got_start", &this,
SYM_SEARCH_OBJ|SYM_NOWARNNOTFOUND|SYM_PLT, NULL, object, NULL);
if (this != NULL)
object->got_addr = ooff + this->st_value;
this = NULL;
ooff = _dl_find_symbol("__got_end", &this,
SYM_SEARCH_OBJ|SYM_NOWARNNOTFOUND|SYM_PLT, NULL, object, NULL);
if (this != NULL)
object->got_size = ooff + this->st_value - object->got_addr;
object->plt_size = 0; /* Text PLT on ARM */
if (object->got_addr == NULL)
object->got_start = NULL;
else {
object->got_start = ELF_TRUNC(object->got_addr, _dl_pagesz);
object->got_size += object->got_addr - object->got_start;
object->got_size = ELF_ROUND(object->got_size, _dl_pagesz);
}
object->plt_start = NULL;
if (!lazy) {
fails = _dl_md_reloc(object, DT_JMPREL, DT_PLTRELSZ);
} else {
rel = (Elf_Rel *)(object->Dyn.info[DT_JMPREL]);
num = (object->Dyn.info[DT_PLTRELSZ]);
for (i = 0; i < num/sizeof(Elf_Rel); i++, rel++) {
Elf_Addr *where;
where = (Elf_Addr *)(rel->r_offset + object->obj_base);
*where += object->obj_base;
}
pltgot[1] = (Elf_Addr)object;
pltgot[2] = (Elf_Addr)_dl_bind_start;
}
if (object->got_size != 0)
_dl_mprotect((void*)object->got_start, object->got_size,
PROT_READ);
if (object->plt_size != 0)
_dl_mprotect((void*)object->plt_start, object->plt_size,
PROT_READ|PROT_EXEC);
return (fails);
}
Elf_Addr
_dl_bind(elf_object_t *object, int relidx)
{
Elf_Rel *rel;
Elf_Word *addr;
const Elf_Sym *sym, *this;
const char *symn;
Elf_Addr ooff, newval;
sigset_t omask, nmask;
rel = ((Elf_Rel *)object->Dyn.info[DT_JMPREL]) + (relidx);
sym = object->dyn.symtab;
sym += ELF_R_SYM(rel->r_info);
symn = object->dyn.strtab + sym->st_name;
this = NULL;
ooff = _dl_find_symbol(symn, &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|SYM_PLT, sym,
object, NULL);
if (this == NULL) {
_dl_printf("lazy binding failed!\n");
*((int *)0) = 0; /* XXX */
}
addr = (Elf_Addr *)(object->obj_base + rel->r_offset);
newval = ooff + this->st_value;
/* if GOT is protected, allow the write */
if (object->got_size != 0) {
sigfillset(&nmask);
_dl_sigprocmask(SIG_BLOCK, &nmask, &omask);
_dl_thread_bind_lock(0);
_dl_mprotect((void*)object->got_start, object->got_size,
PROT_READ|PROT_WRITE);
}
if (*addr != newval)
*addr = newval;
/* put the GOT back to RO */
if (object->got_size != 0) {
_dl_mprotect((void*)object->got_start, object->got_size,
PROT_READ);
_dl_thread_bind_lock(1);
_dl_sigprocmask(SIG_SETMASK, &omask, NULL);
}
return newval;
}