/* $OpenBSD: rtld_machine.c,v 1.26 2018/10/25 16:41:38 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 #include #include #include #include #include #include "syscall.h" #include "archdep.h" #include "resolve.h" int64_t pcookie __attribute__((section(".openbsd.randomdata"))) __dso_hidden; 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 const 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 const 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; long relrel; int fails = 0; Elf_Addr loff; Elf_Addr prev_value = 0; const Elf_Sym *prev_sym = NULL; Elf_RelA *rels; struct load_list *llist; loff = object->obj_base; numrela = object->Dyn.info[relasz] / sizeof(Elf_RelA); relrel = rel == DT_RELA ? object->relacount : 0; rels = (Elf_RelA *)(object->Dyn.info[rel]); if (rels == NULL) return(0); if (relrel > numrela) _dl_die("relacount > numrel: %ld > %ld", relrel, numrela); /* * 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, PROT_READ | PROT_WRITE); } } /* tight loop for leading RELATIVE relocs */ for (i = 0; i < relrel; i++, rels++) { Elf_Addr *where; #ifdef DEBUG if (ELF_R_TYPE(rels->r_info) != R_TYPE(RELATIVE)) _dl_die("RELACOUNT wrong"); #endif where = (Elf_Addr *)(rels->r_offset + loff); *where = rels->r_addend + loff; } for (; 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_die("bad relocation obj %s %ld %d", object->load_name, i, type); 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 if (sym == prev_sym) { value += prev_value; } 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; } prev_sym = sym; prev_value = (Elf_Addr)(ooff + this->st_value); value += prev_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> (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_JMPREL 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]; int i, num; Elf_RelA *rel; if (object->Dyn.info[DT_PLTREL] != DT_RELA) return (0); if (object->traced) lazy = 1; if (!lazy) { fails = _dl_md_reloc(object, DT_JMPREL, DT_PLTRELSZ); } else { rel = (Elf_RelA *)(object->Dyn.info[DT_JMPREL]); num = (object->Dyn.info[DT_PLTRELSZ]) / sizeof(Elf_RelA); for (i = 0; i < num; i++, rel++) { Elf_Addr *where, value; Elf_Word type; where = (Elf_Addr *)(rel->r_offset + object->obj_base); type = ELF_R_TYPE(rel->r_info); if (RELOC_USE_ADDEND(type)) value = rel->r_addend; else value = 0; *where += object->obj_base + value; } pltgot[1] = (Elf_Addr)object; pltgot[2] = (Elf_Addr)_dl_bind_start; } /* mprotect the GOT */ _dl_protect_segment(object, 0, "__got_start", "__got_end", PROT_READ); return (fails); } Elf_Addr _dl_bind(elf_object_t *object, int reloff) { Elf_RelA *rel; const Elf_Sym *sym, *this; const char *symn; const elf_object_t *sobj; Elf_Addr ooff; uint64_t cookie = pcookie; struct { struct __kbind param; Elf_Addr newval; } buf; rel = (Elf_RelA *)(object->Dyn.info[DT_JMPREL] + reloff); 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, &sobj); if (this == NULL) _dl_die("lazy binding failed!"); buf.newval = ooff + this->st_value; if (__predict_false(sobj->traced) && _dl_trace_plt(sobj, symn)) return (buf.newval); buf.param.kb_addr = (Elf_Addr *)(object->obj_base + rel->r_offset); buf.param.kb_size = sizeof(Elf_Addr); /* directly code the syscall, so that it's actually inline here */ { register long syscall_num __asm("r0") = SYS_kbind; register void *arg1 __asm("r4") = &buf; register long arg2 __asm("r5") = sizeof(buf); register long arg3 __asm("r6") = 0xffffffff & cookie; register long arg4 __asm("r7") = 0xffffffff & (cookie >> 32); __asm volatile("trapa #0x80" : "+r" (syscall_num) : "r" (arg1), "r" (arg2), "r" (arg3), "r" (arg4) : "r1", "cc", "memory"); } return (buf.newval); }