Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IA-64-specific support for kernel module loader. |
| 3 | * |
| 4 | * Copyright (C) 2003 Hewlett-Packard Co |
| 5 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 6 | * |
| 7 | * Loosely based on patch by Rusty Russell. |
| 8 | */ |
| 9 | |
| 10 | /* relocs tested so far: |
| 11 | |
| 12 | DIR64LSB |
| 13 | FPTR64LSB |
| 14 | GPREL22 |
| 15 | LDXMOV |
| 16 | LDXMOV |
| 17 | LTOFF22 |
| 18 | LTOFF22X |
| 19 | LTOFF22X |
| 20 | LTOFF_FPTR22 |
| 21 | PCREL21B (for br.call only; br.cond is not supported out of modules!) |
| 22 | PCREL60B (for brl.cond only; brl.call is not supported for modules!) |
| 23 | PCREL64LSB |
| 24 | SECREL32LSB |
| 25 | SEGREL64LSB |
| 26 | */ |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/elf.h> |
| 32 | #include <linux/moduleloader.h> |
| 33 | #include <linux/string.h> |
| 34 | #include <linux/vmalloc.h> |
| 35 | |
| 36 | #include <asm/patch.h> |
| 37 | #include <asm/unaligned.h> |
| 38 | |
| 39 | #define ARCH_MODULE_DEBUG 0 |
| 40 | |
| 41 | #if ARCH_MODULE_DEBUG |
| 42 | # define DEBUGP printk |
| 43 | # define inline |
| 44 | #else |
| 45 | # define DEBUGP(fmt , a...) |
| 46 | #endif |
| 47 | |
| 48 | #ifdef CONFIG_ITANIUM |
| 49 | # define USE_BRL 0 |
| 50 | #else |
| 51 | # define USE_BRL 1 |
| 52 | #endif |
| 53 | |
| 54 | #define MAX_LTOFF ((uint64_t) (1 << 22)) /* max. allowable linkage-table offset */ |
| 55 | |
| 56 | /* Define some relocation helper macros/types: */ |
| 57 | |
| 58 | #define FORMAT_SHIFT 0 |
| 59 | #define FORMAT_BITS 3 |
| 60 | #define FORMAT_MASK ((1 << FORMAT_BITS) - 1) |
| 61 | #define VALUE_SHIFT 3 |
| 62 | #define VALUE_BITS 5 |
| 63 | #define VALUE_MASK ((1 << VALUE_BITS) - 1) |
| 64 | |
| 65 | enum reloc_target_format { |
| 66 | /* direct encoded formats: */ |
| 67 | RF_NONE = 0, |
| 68 | RF_INSN14 = 1, |
| 69 | RF_INSN22 = 2, |
| 70 | RF_INSN64 = 3, |
| 71 | RF_32MSB = 4, |
| 72 | RF_32LSB = 5, |
| 73 | RF_64MSB = 6, |
| 74 | RF_64LSB = 7, |
| 75 | |
| 76 | /* formats that cannot be directly decoded: */ |
| 77 | RF_INSN60, |
| 78 | RF_INSN21B, /* imm21 form 1 */ |
| 79 | RF_INSN21M, /* imm21 form 2 */ |
| 80 | RF_INSN21F /* imm21 form 3 */ |
| 81 | }; |
| 82 | |
| 83 | enum reloc_value_formula { |
| 84 | RV_DIRECT = 4, /* S + A */ |
| 85 | RV_GPREL = 5, /* @gprel(S + A) */ |
| 86 | RV_LTREL = 6, /* @ltoff(S + A) */ |
| 87 | RV_PLTREL = 7, /* @pltoff(S + A) */ |
| 88 | RV_FPTR = 8, /* @fptr(S + A) */ |
| 89 | RV_PCREL = 9, /* S + A - P */ |
| 90 | RV_LTREL_FPTR = 10, /* @ltoff(@fptr(S + A)) */ |
| 91 | RV_SEGREL = 11, /* @segrel(S + A) */ |
| 92 | RV_SECREL = 12, /* @secrel(S + A) */ |
| 93 | RV_BDREL = 13, /* BD + A */ |
| 94 | RV_LTV = 14, /* S + A (like RV_DIRECT, except frozen at static link-time) */ |
| 95 | RV_PCREL2 = 15, /* S + A - P */ |
| 96 | RV_SPECIAL = 16, /* various (see below) */ |
| 97 | RV_RSVD17 = 17, |
| 98 | RV_TPREL = 18, /* @tprel(S + A) */ |
| 99 | RV_LTREL_TPREL = 19, /* @ltoff(@tprel(S + A)) */ |
| 100 | RV_DTPMOD = 20, /* @dtpmod(S + A) */ |
| 101 | RV_LTREL_DTPMOD = 21, /* @ltoff(@dtpmod(S + A)) */ |
| 102 | RV_DTPREL = 22, /* @dtprel(S + A) */ |
| 103 | RV_LTREL_DTPREL = 23, /* @ltoff(@dtprel(S + A)) */ |
| 104 | RV_RSVD24 = 24, |
| 105 | RV_RSVD25 = 25, |
| 106 | RV_RSVD26 = 26, |
| 107 | RV_RSVD27 = 27 |
| 108 | /* 28-31 reserved for implementation-specific purposes. */ |
| 109 | }; |
| 110 | |
| 111 | #define N(reloc) [R_IA64_##reloc] = #reloc |
| 112 | |
| 113 | static const char *reloc_name[256] = { |
| 114 | N(NONE), N(IMM14), N(IMM22), N(IMM64), |
| 115 | N(DIR32MSB), N(DIR32LSB), N(DIR64MSB), N(DIR64LSB), |
| 116 | N(GPREL22), N(GPREL64I), N(GPREL32MSB), N(GPREL32LSB), |
| 117 | N(GPREL64MSB), N(GPREL64LSB), N(LTOFF22), N(LTOFF64I), |
| 118 | N(PLTOFF22), N(PLTOFF64I), N(PLTOFF64MSB), N(PLTOFF64LSB), |
| 119 | N(FPTR64I), N(FPTR32MSB), N(FPTR32LSB), N(FPTR64MSB), |
| 120 | N(FPTR64LSB), N(PCREL60B), N(PCREL21B), N(PCREL21M), |
| 121 | N(PCREL21F), N(PCREL32MSB), N(PCREL32LSB), N(PCREL64MSB), |
| 122 | N(PCREL64LSB), N(LTOFF_FPTR22), N(LTOFF_FPTR64I), N(LTOFF_FPTR32MSB), |
| 123 | N(LTOFF_FPTR32LSB), N(LTOFF_FPTR64MSB), N(LTOFF_FPTR64LSB), N(SEGREL32MSB), |
| 124 | N(SEGREL32LSB), N(SEGREL64MSB), N(SEGREL64LSB), N(SECREL32MSB), |
| 125 | N(SECREL32LSB), N(SECREL64MSB), N(SECREL64LSB), N(REL32MSB), |
| 126 | N(REL32LSB), N(REL64MSB), N(REL64LSB), N(LTV32MSB), |
| 127 | N(LTV32LSB), N(LTV64MSB), N(LTV64LSB), N(PCREL21BI), |
| 128 | N(PCREL22), N(PCREL64I), N(IPLTMSB), N(IPLTLSB), |
| 129 | N(COPY), N(LTOFF22X), N(LDXMOV), N(TPREL14), |
| 130 | N(TPREL22), N(TPREL64I), N(TPREL64MSB), N(TPREL64LSB), |
| 131 | N(LTOFF_TPREL22), N(DTPMOD64MSB), N(DTPMOD64LSB), N(LTOFF_DTPMOD22), |
| 132 | N(DTPREL14), N(DTPREL22), N(DTPREL64I), N(DTPREL32MSB), |
| 133 | N(DTPREL32LSB), N(DTPREL64MSB), N(DTPREL64LSB), N(LTOFF_DTPREL22) |
| 134 | }; |
| 135 | |
| 136 | #undef N |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* Opaque struct for insns, to protect against derefs. */ |
| 139 | struct insn; |
| 140 | |
| 141 | static inline uint64_t |
| 142 | bundle (const struct insn *insn) |
| 143 | { |
| 144 | return (uint64_t) insn & ~0xfUL; |
| 145 | } |
| 146 | |
| 147 | static inline int |
| 148 | slot (const struct insn *insn) |
| 149 | { |
| 150 | return (uint64_t) insn & 0x3; |
| 151 | } |
| 152 | |
| 153 | static int |
| 154 | apply_imm64 (struct module *mod, struct insn *insn, uint64_t val) |
| 155 | { |
| 156 | if (slot(insn) != 2) { |
| 157 | printk(KERN_ERR "%s: invalid slot number %d for IMM64\n", |
| 158 | mod->name, slot(insn)); |
| 159 | return 0; |
| 160 | } |
| 161 | ia64_patch_imm64((u64) insn, val); |
| 162 | return 1; |
| 163 | } |
| 164 | |
| 165 | static int |
| 166 | apply_imm60 (struct module *mod, struct insn *insn, uint64_t val) |
| 167 | { |
| 168 | if (slot(insn) != 2) { |
| 169 | printk(KERN_ERR "%s: invalid slot number %d for IMM60\n", |
| 170 | mod->name, slot(insn)); |
| 171 | return 0; |
| 172 | } |
| 173 | if (val + ((uint64_t) 1 << 59) >= (1UL << 60)) { |
| 174 | printk(KERN_ERR "%s: value %ld out of IMM60 range\n", mod->name, (int64_t) val); |
| 175 | return 0; |
| 176 | } |
| 177 | ia64_patch_imm60((u64) insn, val); |
| 178 | return 1; |
| 179 | } |
| 180 | |
| 181 | static int |
| 182 | apply_imm22 (struct module *mod, struct insn *insn, uint64_t val) |
| 183 | { |
| 184 | if (val + (1 << 21) >= (1 << 22)) { |
| 185 | printk(KERN_ERR "%s: value %li out of IMM22 range\n", mod->name, (int64_t)val); |
| 186 | return 0; |
| 187 | } |
| 188 | ia64_patch((u64) insn, 0x01fffcfe000UL, ( ((val & 0x200000UL) << 15) /* bit 21 -> 36 */ |
| 189 | | ((val & 0x1f0000UL) << 6) /* bit 16 -> 22 */ |
| 190 | | ((val & 0x00ff80UL) << 20) /* bit 7 -> 27 */ |
| 191 | | ((val & 0x00007fUL) << 13) /* bit 0 -> 13 */)); |
| 192 | return 1; |
| 193 | } |
| 194 | |
| 195 | static int |
| 196 | apply_imm21b (struct module *mod, struct insn *insn, uint64_t val) |
| 197 | { |
| 198 | if (val + (1 << 20) >= (1 << 21)) { |
| 199 | printk(KERN_ERR "%s: value %li out of IMM21b range\n", mod->name, (int64_t)val); |
| 200 | return 0; |
| 201 | } |
| 202 | ia64_patch((u64) insn, 0x11ffffe000UL, ( ((val & 0x100000UL) << 16) /* bit 20 -> 36 */ |
| 203 | | ((val & 0x0fffffUL) << 13) /* bit 0 -> 13 */)); |
| 204 | return 1; |
| 205 | } |
| 206 | |
| 207 | #if USE_BRL |
| 208 | |
| 209 | struct plt_entry { |
| 210 | /* Three instruction bundles in PLT. */ |
| 211 | unsigned char bundle[2][16]; |
| 212 | }; |
| 213 | |
| 214 | static const struct plt_entry ia64_plt_template = { |
| 215 | { |
| 216 | { |
| 217 | 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ |
| 218 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, /* movl gp=TARGET_GP */ |
| 219 | 0x00, 0x00, 0x00, 0x60 |
| 220 | }, |
| 221 | { |
| 222 | 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ |
| 223 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* brl.many gp=TARGET_GP */ |
| 224 | 0x08, 0x00, 0x00, 0xc0 |
| 225 | } |
| 226 | } |
| 227 | }; |
| 228 | |
| 229 | static int |
| 230 | patch_plt (struct module *mod, struct plt_entry *plt, long target_ip, unsigned long target_gp) |
| 231 | { |
| 232 | if (apply_imm64(mod, (struct insn *) (plt->bundle[0] + 2), target_gp) |
| 233 | && apply_imm60(mod, (struct insn *) (plt->bundle[1] + 2), |
| 234 | (target_ip - (int64_t) plt->bundle[1]) / 16)) |
| 235 | return 1; |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | unsigned long |
| 240 | plt_target (struct plt_entry *plt) |
| 241 | { |
| 242 | uint64_t b0, b1, *b = (uint64_t *) plt->bundle[1]; |
| 243 | long off; |
| 244 | |
| 245 | b0 = b[0]; b1 = b[1]; |
| 246 | off = ( ((b1 & 0x00fffff000000000UL) >> 36) /* imm20b -> bit 0 */ |
| 247 | | ((b0 >> 48) << 20) | ((b1 & 0x7fffffUL) << 36) /* imm39 -> bit 20 */ |
| 248 | | ((b1 & 0x0800000000000000UL) << 0)); /* i -> bit 59 */ |
| 249 | return (long) plt->bundle[1] + 16*off; |
| 250 | } |
| 251 | |
| 252 | #else /* !USE_BRL */ |
| 253 | |
| 254 | struct plt_entry { |
| 255 | /* Three instruction bundles in PLT. */ |
| 256 | unsigned char bundle[3][16]; |
| 257 | }; |
| 258 | |
| 259 | static const struct plt_entry ia64_plt_template = { |
| 260 | { |
| 261 | { |
| 262 | 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ |
| 263 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* movl r16=TARGET_IP */ |
| 264 | 0x02, 0x00, 0x00, 0x60 |
| 265 | }, |
| 266 | { |
| 267 | 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ |
| 268 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, /* movl gp=TARGET_GP */ |
| 269 | 0x00, 0x00, 0x00, 0x60 |
| 270 | }, |
| 271 | { |
| 272 | 0x11, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MIB] nop.m 0 */ |
| 273 | 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */ |
| 274 | 0x60, 0x00, 0x80, 0x00 /* br.few b6 */ |
| 275 | } |
| 276 | } |
| 277 | }; |
| 278 | |
| 279 | static int |
| 280 | patch_plt (struct module *mod, struct plt_entry *plt, long target_ip, unsigned long target_gp) |
| 281 | { |
| 282 | if (apply_imm64(mod, (struct insn *) (plt->bundle[0] + 2), target_ip) |
| 283 | && apply_imm64(mod, (struct insn *) (plt->bundle[1] + 2), target_gp)) |
| 284 | return 1; |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | unsigned long |
| 289 | plt_target (struct plt_entry *plt) |
| 290 | { |
| 291 | uint64_t b0, b1, *b = (uint64_t *) plt->bundle[0]; |
| 292 | |
| 293 | b0 = b[0]; b1 = b[1]; |
| 294 | return ( ((b1 & 0x000007f000000000) >> 36) /* imm7b -> bit 0 */ |
| 295 | | ((b1 & 0x07fc000000000000) >> 43) /* imm9d -> bit 7 */ |
| 296 | | ((b1 & 0x0003e00000000000) >> 29) /* imm5c -> bit 16 */ |
| 297 | | ((b1 & 0x0000100000000000) >> 23) /* ic -> bit 21 */ |
| 298 | | ((b0 >> 46) << 22) | ((b1 & 0x7fffff) << 40) /* imm41 -> bit 22 */ |
| 299 | | ((b1 & 0x0800000000000000) << 4)); /* i -> bit 63 */ |
| 300 | } |
| 301 | |
| 302 | #endif /* !USE_BRL */ |
| 303 | |
| 304 | void * |
| 305 | module_alloc (unsigned long size) |
| 306 | { |
| 307 | if (!size) |
| 308 | return NULL; |
| 309 | return vmalloc(size); |
| 310 | } |
| 311 | |
| 312 | void |
| 313 | module_free (struct module *mod, void *module_region) |
| 314 | { |
Akiyama, Nobuyuki | 740a8de | 2008-07-17 11:22:01 -0700 | [diff] [blame] | 315 | if (mod && mod->arch.init_unw_table && |
| 316 | module_region == mod->module_init) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | unw_remove_unwind_table(mod->arch.init_unw_table); |
| 318 | mod->arch.init_unw_table = NULL; |
| 319 | } |
| 320 | vfree(module_region); |
| 321 | } |
| 322 | |
| 323 | /* Have we already seen one of these relocations? */ |
| 324 | /* FIXME: we could look in other sections, too --RR */ |
| 325 | static int |
| 326 | duplicate_reloc (const Elf64_Rela *rela, unsigned int num) |
| 327 | { |
| 328 | unsigned int i; |
| 329 | |
| 330 | for (i = 0; i < num; i++) { |
| 331 | if (rela[i].r_info == rela[num].r_info && rela[i].r_addend == rela[num].r_addend) |
| 332 | return 1; |
| 333 | } |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | /* Count how many GOT entries we may need */ |
| 338 | static unsigned int |
| 339 | count_gots (const Elf64_Rela *rela, unsigned int num) |
| 340 | { |
| 341 | unsigned int i, ret = 0; |
| 342 | |
| 343 | /* Sure, this is order(n^2), but it's usually short, and not |
| 344 | time critical */ |
| 345 | for (i = 0; i < num; i++) { |
| 346 | switch (ELF64_R_TYPE(rela[i].r_info)) { |
| 347 | case R_IA64_LTOFF22: |
| 348 | case R_IA64_LTOFF22X: |
| 349 | case R_IA64_LTOFF64I: |
| 350 | case R_IA64_LTOFF_FPTR22: |
| 351 | case R_IA64_LTOFF_FPTR64I: |
| 352 | case R_IA64_LTOFF_FPTR32MSB: |
| 353 | case R_IA64_LTOFF_FPTR32LSB: |
| 354 | case R_IA64_LTOFF_FPTR64MSB: |
| 355 | case R_IA64_LTOFF_FPTR64LSB: |
| 356 | if (!duplicate_reloc(rela, i)) |
| 357 | ret++; |
| 358 | break; |
| 359 | } |
| 360 | } |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | /* Count how many PLT entries we may need */ |
| 365 | static unsigned int |
| 366 | count_plts (const Elf64_Rela *rela, unsigned int num) |
| 367 | { |
| 368 | unsigned int i, ret = 0; |
| 369 | |
| 370 | /* Sure, this is order(n^2), but it's usually short, and not |
| 371 | time critical */ |
| 372 | for (i = 0; i < num; i++) { |
| 373 | switch (ELF64_R_TYPE(rela[i].r_info)) { |
| 374 | case R_IA64_PCREL21B: |
| 375 | case R_IA64_PLTOFF22: |
| 376 | case R_IA64_PLTOFF64I: |
| 377 | case R_IA64_PLTOFF64MSB: |
| 378 | case R_IA64_PLTOFF64LSB: |
| 379 | case R_IA64_IPLTMSB: |
| 380 | case R_IA64_IPLTLSB: |
| 381 | if (!duplicate_reloc(rela, i)) |
| 382 | ret++; |
| 383 | break; |
| 384 | } |
| 385 | } |
| 386 | return ret; |
| 387 | } |
| 388 | |
| 389 | /* We need to create an function-descriptors for any internal function |
| 390 | which is referenced. */ |
| 391 | static unsigned int |
| 392 | count_fdescs (const Elf64_Rela *rela, unsigned int num) |
| 393 | { |
| 394 | unsigned int i, ret = 0; |
| 395 | |
| 396 | /* Sure, this is order(n^2), but it's usually short, and not time critical. */ |
| 397 | for (i = 0; i < num; i++) { |
| 398 | switch (ELF64_R_TYPE(rela[i].r_info)) { |
| 399 | case R_IA64_FPTR64I: |
| 400 | case R_IA64_FPTR32LSB: |
| 401 | case R_IA64_FPTR32MSB: |
| 402 | case R_IA64_FPTR64LSB: |
| 403 | case R_IA64_FPTR64MSB: |
| 404 | case R_IA64_LTOFF_FPTR22: |
| 405 | case R_IA64_LTOFF_FPTR32LSB: |
| 406 | case R_IA64_LTOFF_FPTR32MSB: |
| 407 | case R_IA64_LTOFF_FPTR64I: |
| 408 | case R_IA64_LTOFF_FPTR64LSB: |
| 409 | case R_IA64_LTOFF_FPTR64MSB: |
| 410 | case R_IA64_IPLTMSB: |
| 411 | case R_IA64_IPLTLSB: |
| 412 | /* |
| 413 | * Jumps to static functions sometimes go straight to their |
| 414 | * offset. Of course, that may not be possible if the jump is |
| 415 | * from init -> core or vice. versa, so we need to generate an |
| 416 | * FDESC (and PLT etc) for that. |
| 417 | */ |
| 418 | case R_IA64_PCREL21B: |
| 419 | if (!duplicate_reloc(rela, i)) |
| 420 | ret++; |
| 421 | break; |
| 422 | } |
| 423 | } |
| 424 | return ret; |
| 425 | } |
| 426 | |
| 427 | int |
| 428 | module_frob_arch_sections (Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, char *secstrings, |
| 429 | struct module *mod) |
| 430 | { |
| 431 | unsigned long core_plts = 0, init_plts = 0, gots = 0, fdescs = 0; |
| 432 | Elf64_Shdr *s, *sechdrs_end = sechdrs + ehdr->e_shnum; |
| 433 | |
| 434 | /* |
| 435 | * To store the PLTs and function-descriptors, we expand the .text section for |
| 436 | * core module-code and the .init.text section for initialization code. |
| 437 | */ |
| 438 | for (s = sechdrs; s < sechdrs_end; ++s) |
| 439 | if (strcmp(".core.plt", secstrings + s->sh_name) == 0) |
| 440 | mod->arch.core_plt = s; |
| 441 | else if (strcmp(".init.plt", secstrings + s->sh_name) == 0) |
| 442 | mod->arch.init_plt = s; |
| 443 | else if (strcmp(".got", secstrings + s->sh_name) == 0) |
| 444 | mod->arch.got = s; |
| 445 | else if (strcmp(".opd", secstrings + s->sh_name) == 0) |
| 446 | mod->arch.opd = s; |
| 447 | else if (strcmp(".IA_64.unwind", secstrings + s->sh_name) == 0) |
| 448 | mod->arch.unwind = s; |
| 449 | |
| 450 | if (!mod->arch.core_plt || !mod->arch.init_plt || !mod->arch.got || !mod->arch.opd) { |
| 451 | printk(KERN_ERR "%s: sections missing\n", mod->name); |
| 452 | return -ENOEXEC; |
| 453 | } |
| 454 | |
| 455 | /* GOT and PLTs can occur in any relocated section... */ |
| 456 | for (s = sechdrs + 1; s < sechdrs_end; ++s) { |
| 457 | const Elf64_Rela *rels = (void *)ehdr + s->sh_offset; |
| 458 | unsigned long numrels = s->sh_size/sizeof(Elf64_Rela); |
| 459 | |
| 460 | if (s->sh_type != SHT_RELA) |
| 461 | continue; |
| 462 | |
| 463 | gots += count_gots(rels, numrels); |
| 464 | fdescs += count_fdescs(rels, numrels); |
| 465 | if (strstr(secstrings + s->sh_name, ".init")) |
| 466 | init_plts += count_plts(rels, numrels); |
| 467 | else |
| 468 | core_plts += count_plts(rels, numrels); |
| 469 | } |
| 470 | |
| 471 | mod->arch.core_plt->sh_type = SHT_NOBITS; |
| 472 | mod->arch.core_plt->sh_flags = SHF_EXECINSTR | SHF_ALLOC; |
| 473 | mod->arch.core_plt->sh_addralign = 16; |
| 474 | mod->arch.core_plt->sh_size = core_plts * sizeof(struct plt_entry); |
| 475 | mod->arch.init_plt->sh_type = SHT_NOBITS; |
| 476 | mod->arch.init_plt->sh_flags = SHF_EXECINSTR | SHF_ALLOC; |
| 477 | mod->arch.init_plt->sh_addralign = 16; |
| 478 | mod->arch.init_plt->sh_size = init_plts * sizeof(struct plt_entry); |
| 479 | mod->arch.got->sh_type = SHT_NOBITS; |
| 480 | mod->arch.got->sh_flags = ARCH_SHF_SMALL | SHF_ALLOC; |
| 481 | mod->arch.got->sh_addralign = 8; |
| 482 | mod->arch.got->sh_size = gots * sizeof(struct got_entry); |
| 483 | mod->arch.opd->sh_type = SHT_NOBITS; |
| 484 | mod->arch.opd->sh_flags = SHF_ALLOC; |
| 485 | mod->arch.opd->sh_addralign = 8; |
| 486 | mod->arch.opd->sh_size = fdescs * sizeof(struct fdesc); |
| 487 | DEBUGP("%s: core.plt=%lx, init.plt=%lx, got=%lx, fdesc=%lx\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 488 | __func__, mod->arch.core_plt->sh_size, mod->arch.init_plt->sh_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | mod->arch.got->sh_size, mod->arch.opd->sh_size); |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | static inline int |
| 494 | in_init (const struct module *mod, uint64_t addr) |
| 495 | { |
| 496 | return addr - (uint64_t) mod->module_init < mod->init_size; |
| 497 | } |
| 498 | |
| 499 | static inline int |
| 500 | in_core (const struct module *mod, uint64_t addr) |
| 501 | { |
| 502 | return addr - (uint64_t) mod->module_core < mod->core_size; |
| 503 | } |
| 504 | |
| 505 | static inline int |
| 506 | is_internal (const struct module *mod, uint64_t value) |
| 507 | { |
| 508 | return in_init(mod, value) || in_core(mod, value); |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * Get gp-relative offset for the linkage-table entry of VALUE. |
| 513 | */ |
| 514 | static uint64_t |
| 515 | get_ltoff (struct module *mod, uint64_t value, int *okp) |
| 516 | { |
| 517 | struct got_entry *got, *e; |
| 518 | |
| 519 | if (!*okp) |
| 520 | return 0; |
| 521 | |
| 522 | got = (void *) mod->arch.got->sh_addr; |
| 523 | for (e = got; e < got + mod->arch.next_got_entry; ++e) |
| 524 | if (e->val == value) |
| 525 | goto found; |
| 526 | |
| 527 | /* Not enough GOT entries? */ |
| 528 | if (e >= (struct got_entry *) (mod->arch.got->sh_addr + mod->arch.got->sh_size)) |
| 529 | BUG(); |
| 530 | |
| 531 | e->val = value; |
| 532 | ++mod->arch.next_got_entry; |
| 533 | found: |
| 534 | return (uint64_t) e - mod->arch.gp; |
| 535 | } |
| 536 | |
| 537 | static inline int |
| 538 | gp_addressable (struct module *mod, uint64_t value) |
| 539 | { |
| 540 | return value - mod->arch.gp + MAX_LTOFF/2 < MAX_LTOFF; |
| 541 | } |
| 542 | |
| 543 | /* Get PC-relative PLT entry for this value. Returns 0 on failure. */ |
| 544 | static uint64_t |
| 545 | get_plt (struct module *mod, const struct insn *insn, uint64_t value, int *okp) |
| 546 | { |
| 547 | struct plt_entry *plt, *plt_end; |
| 548 | uint64_t target_ip, target_gp; |
| 549 | |
| 550 | if (!*okp) |
| 551 | return 0; |
| 552 | |
| 553 | if (in_init(mod, (uint64_t) insn)) { |
| 554 | plt = (void *) mod->arch.init_plt->sh_addr; |
| 555 | plt_end = (void *) plt + mod->arch.init_plt->sh_size; |
| 556 | } else { |
| 557 | plt = (void *) mod->arch.core_plt->sh_addr; |
| 558 | plt_end = (void *) plt + mod->arch.core_plt->sh_size; |
| 559 | } |
| 560 | |
| 561 | /* "value" is a pointer to a function-descriptor; fetch the target ip/gp from it: */ |
| 562 | target_ip = ((uint64_t *) value)[0]; |
| 563 | target_gp = ((uint64_t *) value)[1]; |
| 564 | |
| 565 | /* Look for existing PLT entry. */ |
| 566 | while (plt->bundle[0][0]) { |
| 567 | if (plt_target(plt) == target_ip) |
| 568 | goto found; |
| 569 | if (++plt >= plt_end) |
| 570 | BUG(); |
| 571 | } |
| 572 | *plt = ia64_plt_template; |
| 573 | if (!patch_plt(mod, plt, target_ip, target_gp)) { |
| 574 | *okp = 0; |
| 575 | return 0; |
| 576 | } |
| 577 | #if ARCH_MODULE_DEBUG |
| 578 | if (plt_target(plt) != target_ip) { |
| 579 | printk("%s: mistargeted PLT: wanted %lx, got %lx\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 580 | __func__, target_ip, plt_target(plt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | *okp = 0; |
| 582 | return 0; |
| 583 | } |
| 584 | #endif |
| 585 | found: |
| 586 | return (uint64_t) plt; |
| 587 | } |
| 588 | |
| 589 | /* Get function descriptor for VALUE. */ |
| 590 | static uint64_t |
| 591 | get_fdesc (struct module *mod, uint64_t value, int *okp) |
| 592 | { |
| 593 | struct fdesc *fdesc = (void *) mod->arch.opd->sh_addr; |
| 594 | |
| 595 | if (!*okp) |
| 596 | return 0; |
| 597 | |
| 598 | if (!value) { |
| 599 | printk(KERN_ERR "%s: fdesc for zero requested!\n", mod->name); |
| 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | if (!is_internal(mod, value)) |
| 604 | /* |
| 605 | * If it's not a module-local entry-point, "value" already points to a |
| 606 | * function-descriptor. |
| 607 | */ |
| 608 | return value; |
| 609 | |
| 610 | /* Look for existing function descriptor. */ |
| 611 | while (fdesc->ip) { |
| 612 | if (fdesc->ip == value) |
| 613 | return (uint64_t)fdesc; |
| 614 | if ((uint64_t) ++fdesc >= mod->arch.opd->sh_addr + mod->arch.opd->sh_size) |
| 615 | BUG(); |
| 616 | } |
| 617 | |
| 618 | /* Create new one */ |
| 619 | fdesc->ip = value; |
| 620 | fdesc->gp = mod->arch.gp; |
| 621 | return (uint64_t) fdesc; |
| 622 | } |
| 623 | |
| 624 | static inline int |
| 625 | do_reloc (struct module *mod, uint8_t r_type, Elf64_Sym *sym, uint64_t addend, |
| 626 | Elf64_Shdr *sec, void *location) |
| 627 | { |
| 628 | enum reloc_target_format format = (r_type >> FORMAT_SHIFT) & FORMAT_MASK; |
| 629 | enum reloc_value_formula formula = (r_type >> VALUE_SHIFT) & VALUE_MASK; |
| 630 | uint64_t val; |
| 631 | int ok = 1; |
| 632 | |
| 633 | val = sym->st_value + addend; |
| 634 | |
| 635 | switch (formula) { |
| 636 | case RV_SEGREL: /* segment base is arbitrarily chosen to be 0 for kernel modules */ |
| 637 | case RV_DIRECT: |
| 638 | break; |
| 639 | |
| 640 | case RV_GPREL: val -= mod->arch.gp; break; |
| 641 | case RV_LTREL: val = get_ltoff(mod, val, &ok); break; |
| 642 | case RV_PLTREL: val = get_plt(mod, location, val, &ok); break; |
| 643 | case RV_FPTR: val = get_fdesc(mod, val, &ok); break; |
| 644 | case RV_SECREL: val -= sec->sh_addr; break; |
| 645 | case RV_LTREL_FPTR: val = get_ltoff(mod, get_fdesc(mod, val, &ok), &ok); break; |
| 646 | |
| 647 | case RV_PCREL: |
| 648 | switch (r_type) { |
| 649 | case R_IA64_PCREL21B: |
| 650 | if ((in_init(mod, val) && in_core(mod, (uint64_t)location)) || |
| 651 | (in_core(mod, val) && in_init(mod, (uint64_t)location))) { |
| 652 | /* |
| 653 | * Init section may have been allocated far away from core, |
| 654 | * if the branch won't reach, then allocate a plt for it. |
| 655 | */ |
| 656 | uint64_t delta = ((int64_t)val - (int64_t)location) / 16; |
| 657 | if (delta + (1 << 20) >= (1 << 21)) { |
| 658 | val = get_fdesc(mod, val, &ok); |
| 659 | val = get_plt(mod, location, val, &ok); |
| 660 | } |
| 661 | } else if (!is_internal(mod, val)) |
| 662 | val = get_plt(mod, location, val, &ok); |
| 663 | /* FALL THROUGH */ |
| 664 | default: |
| 665 | val -= bundle(location); |
| 666 | break; |
| 667 | |
| 668 | case R_IA64_PCREL32MSB: |
| 669 | case R_IA64_PCREL32LSB: |
| 670 | case R_IA64_PCREL64MSB: |
| 671 | case R_IA64_PCREL64LSB: |
| 672 | val -= (uint64_t) location; |
| 673 | break; |
| 674 | |
| 675 | } |
| 676 | switch (r_type) { |
| 677 | case R_IA64_PCREL60B: format = RF_INSN60; break; |
| 678 | case R_IA64_PCREL21B: format = RF_INSN21B; break; |
| 679 | case R_IA64_PCREL21M: format = RF_INSN21M; break; |
| 680 | case R_IA64_PCREL21F: format = RF_INSN21F; break; |
| 681 | default: break; |
| 682 | } |
| 683 | break; |
| 684 | |
| 685 | case RV_BDREL: |
| 686 | val -= (uint64_t) (in_init(mod, val) ? mod->module_init : mod->module_core); |
| 687 | break; |
| 688 | |
| 689 | case RV_LTV: |
| 690 | /* can link-time value relocs happen here? */ |
| 691 | BUG(); |
| 692 | break; |
| 693 | |
| 694 | case RV_PCREL2: |
| 695 | if (r_type == R_IA64_PCREL21BI) { |
| 696 | if (!is_internal(mod, val)) { |
| 697 | printk(KERN_ERR "%s: %s reloc against non-local symbol (%lx)\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 698 | __func__, reloc_name[r_type], val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | return -ENOEXEC; |
| 700 | } |
| 701 | format = RF_INSN21B; |
| 702 | } |
| 703 | val -= bundle(location); |
| 704 | break; |
| 705 | |
| 706 | case RV_SPECIAL: |
| 707 | switch (r_type) { |
| 708 | case R_IA64_IPLTMSB: |
| 709 | case R_IA64_IPLTLSB: |
| 710 | val = get_fdesc(mod, get_plt(mod, location, val, &ok), &ok); |
| 711 | format = RF_64LSB; |
| 712 | if (r_type == R_IA64_IPLTMSB) |
| 713 | format = RF_64MSB; |
| 714 | break; |
| 715 | |
| 716 | case R_IA64_SUB: |
| 717 | val = addend - sym->st_value; |
| 718 | format = RF_INSN64; |
| 719 | break; |
| 720 | |
| 721 | case R_IA64_LTOFF22X: |
| 722 | if (gp_addressable(mod, val)) |
| 723 | val -= mod->arch.gp; |
| 724 | else |
| 725 | val = get_ltoff(mod, val, &ok); |
| 726 | format = RF_INSN22; |
| 727 | break; |
| 728 | |
| 729 | case R_IA64_LDXMOV: |
| 730 | if (gp_addressable(mod, val)) { |
| 731 | /* turn "ld8" into "mov": */ |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 732 | DEBUGP("%s: patching ld8 at %p to mov\n", __func__, location); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | ia64_patch((u64) location, 0x1fff80fe000UL, 0x10000000000UL); |
| 734 | } |
| 735 | return 0; |
| 736 | |
| 737 | default: |
| 738 | if (reloc_name[r_type]) |
| 739 | printk(KERN_ERR "%s: special reloc %s not supported", |
| 740 | mod->name, reloc_name[r_type]); |
| 741 | else |
| 742 | printk(KERN_ERR "%s: unknown special reloc %x\n", |
| 743 | mod->name, r_type); |
| 744 | return -ENOEXEC; |
| 745 | } |
| 746 | break; |
| 747 | |
| 748 | case RV_TPREL: |
| 749 | case RV_LTREL_TPREL: |
| 750 | case RV_DTPMOD: |
| 751 | case RV_LTREL_DTPMOD: |
| 752 | case RV_DTPREL: |
| 753 | case RV_LTREL_DTPREL: |
| 754 | printk(KERN_ERR "%s: %s reloc not supported\n", |
| 755 | mod->name, reloc_name[r_type] ? reloc_name[r_type] : "?"); |
| 756 | return -ENOEXEC; |
| 757 | |
| 758 | default: |
| 759 | printk(KERN_ERR "%s: unknown reloc %x\n", mod->name, r_type); |
| 760 | return -ENOEXEC; |
| 761 | } |
| 762 | |
| 763 | if (!ok) |
| 764 | return -ENOEXEC; |
| 765 | |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 766 | DEBUGP("%s: [%p]<-%016lx = %s(%lx)\n", __func__, location, val, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | reloc_name[r_type] ? reloc_name[r_type] : "?", sym->st_value + addend); |
| 768 | |
| 769 | switch (format) { |
| 770 | case RF_INSN21B: ok = apply_imm21b(mod, location, (int64_t) val / 16); break; |
| 771 | case RF_INSN22: ok = apply_imm22(mod, location, val); break; |
| 772 | case RF_INSN64: ok = apply_imm64(mod, location, val); break; |
| 773 | case RF_INSN60: ok = apply_imm60(mod, location, (int64_t) val / 16); break; |
| 774 | case RF_32LSB: put_unaligned(val, (uint32_t *) location); break; |
| 775 | case RF_64LSB: put_unaligned(val, (uint64_t *) location); break; |
| 776 | case RF_32MSB: /* ia64 Linux is little-endian... */ |
| 777 | case RF_64MSB: /* ia64 Linux is little-endian... */ |
| 778 | case RF_INSN14: /* must be within-module, i.e., resolved by "ld -r" */ |
| 779 | case RF_INSN21M: /* must be within-module, i.e., resolved by "ld -r" */ |
| 780 | case RF_INSN21F: /* must be within-module, i.e., resolved by "ld -r" */ |
| 781 | printk(KERN_ERR "%s: format %u needed by %s reloc is not supported\n", |
| 782 | mod->name, format, reloc_name[r_type] ? reloc_name[r_type] : "?"); |
| 783 | return -ENOEXEC; |
| 784 | |
| 785 | default: |
| 786 | printk(KERN_ERR "%s: relocation %s resulted in unknown format %u\n", |
| 787 | mod->name, reloc_name[r_type] ? reloc_name[r_type] : "?", format); |
| 788 | return -ENOEXEC; |
| 789 | } |
| 790 | return ok ? 0 : -ENOEXEC; |
| 791 | } |
| 792 | |
| 793 | int |
| 794 | apply_relocate_add (Elf64_Shdr *sechdrs, const char *strtab, unsigned int symindex, |
| 795 | unsigned int relsec, struct module *mod) |
| 796 | { |
| 797 | unsigned int i, n = sechdrs[relsec].sh_size / sizeof(Elf64_Rela); |
| 798 | Elf64_Rela *rela = (void *) sechdrs[relsec].sh_addr; |
| 799 | Elf64_Shdr *target_sec; |
| 800 | int ret; |
| 801 | |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 802 | DEBUGP("%s: applying section %u (%u relocs) to %u\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | relsec, n, sechdrs[relsec].sh_info); |
| 804 | |
| 805 | target_sec = sechdrs + sechdrs[relsec].sh_info; |
| 806 | |
| 807 | if (target_sec->sh_entsize == ~0UL) |
| 808 | /* |
| 809 | * If target section wasn't allocated, we don't need to relocate it. |
| 810 | * Happens, e.g., for debug sections. |
| 811 | */ |
| 812 | return 0; |
| 813 | |
| 814 | if (!mod->arch.gp) { |
| 815 | /* |
| 816 | * XXX Should have an arch-hook for running this after final section |
| 817 | * addresses have been selected... |
| 818 | */ |
Keith Owens | 866ba63 | 2005-06-06 02:04:00 -0700 | [diff] [blame] | 819 | uint64_t gp; |
| 820 | if (mod->core_size > MAX_LTOFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | /* |
| 822 | * This takes advantage of fact that SHF_ARCH_SMALL gets allocated |
| 823 | * at the end of the module. |
| 824 | */ |
Keith Owens | 866ba63 | 2005-06-06 02:04:00 -0700 | [diff] [blame] | 825 | gp = mod->core_size - MAX_LTOFF / 2; |
| 826 | else |
| 827 | gp = mod->core_size / 2; |
| 828 | gp = (uint64_t) mod->module_core + ((gp + 7) & -8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | mod->arch.gp = gp; |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 830 | DEBUGP("%s: placing gp at 0x%lx\n", __func__, gp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
| 832 | |
| 833 | for (i = 0; i < n; i++) { |
| 834 | ret = do_reloc(mod, ELF64_R_TYPE(rela[i].r_info), |
| 835 | ((Elf64_Sym *) sechdrs[symindex].sh_addr |
| 836 | + ELF64_R_SYM(rela[i].r_info)), |
| 837 | rela[i].r_addend, target_sec, |
| 838 | (void *) target_sec->sh_addr + rela[i].r_offset); |
| 839 | if (ret < 0) |
| 840 | return ret; |
| 841 | } |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | int |
| 846 | apply_relocate (Elf64_Shdr *sechdrs, const char *strtab, unsigned int symindex, |
| 847 | unsigned int relsec, struct module *mod) |
| 848 | { |
| 849 | printk(KERN_ERR "module %s: REL relocs in section %u unsupported\n", mod->name, relsec); |
| 850 | return -ENOEXEC; |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * Modules contain a single unwind table which covers both the core and the init text |
| 855 | * sections but since the two are not contiguous, we need to split this table up such that |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 856 | * we can register (and unregister) each "segment" separately. Fortunately, this sounds |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | * more complicated than it really is. |
| 858 | */ |
| 859 | static void |
| 860 | register_unwind_table (struct module *mod) |
| 861 | { |
| 862 | struct unw_table_entry *start = (void *) mod->arch.unwind->sh_addr; |
| 863 | struct unw_table_entry *end = start + mod->arch.unwind->sh_size / sizeof (*start); |
| 864 | struct unw_table_entry tmp, *e1, *e2, *core, *init; |
| 865 | unsigned long num_init = 0, num_core = 0; |
| 866 | |
| 867 | /* First, count how many init and core unwind-table entries there are. */ |
| 868 | for (e1 = start; e1 < end; ++e1) |
| 869 | if (in_init(mod, e1->start_offset)) |
| 870 | ++num_init; |
| 871 | else |
| 872 | ++num_core; |
| 873 | /* |
| 874 | * Second, sort the table such that all unwind-table entries for the init and core |
| 875 | * text sections are nicely separated. We do this with a stupid bubble sort |
| 876 | * (unwind tables don't get ridiculously huge). |
| 877 | */ |
| 878 | for (e1 = start; e1 < end; ++e1) { |
| 879 | for (e2 = e1 + 1; e2 < end; ++e2) { |
| 880 | if (e2->start_offset < e1->start_offset) { |
| 881 | tmp = *e1; |
| 882 | *e1 = *e2; |
| 883 | *e2 = tmp; |
| 884 | } |
| 885 | } |
| 886 | } |
| 887 | /* |
| 888 | * Third, locate the init and core segments in the unwind table: |
| 889 | */ |
| 890 | if (in_init(mod, start->start_offset)) { |
| 891 | init = start; |
| 892 | core = start + num_init; |
| 893 | } else { |
| 894 | core = start; |
| 895 | init = start + num_core; |
| 896 | } |
| 897 | |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 898 | DEBUGP("%s: name=%s, gp=%lx, num_init=%lu, num_core=%lu\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | mod->name, mod->arch.gp, num_init, num_core); |
| 900 | |
| 901 | /* |
| 902 | * Fourth, register both tables (if not empty). |
| 903 | */ |
| 904 | if (num_core > 0) { |
| 905 | mod->arch.core_unw_table = unw_add_unwind_table(mod->name, 0, mod->arch.gp, |
| 906 | core, core + num_core); |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 907 | DEBUGP("%s: core: handle=%p [%p-%p)\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | mod->arch.core_unw_table, core, core + num_core); |
| 909 | } |
| 910 | if (num_init > 0) { |
| 911 | mod->arch.init_unw_table = unw_add_unwind_table(mod->name, 0, mod->arch.gp, |
| 912 | init, init + num_init); |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 913 | DEBUGP("%s: init: handle=%p [%p-%p)\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | mod->arch.init_unw_table, init, init + num_init); |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | int |
| 919 | module_finalize (const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *mod) |
| 920 | { |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 921 | DEBUGP("%s: init: entry=%p\n", __func__, mod->init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | if (mod->arch.unwind) |
| 923 | register_unwind_table(mod); |
| 924 | return 0; |
| 925 | } |
| 926 | |
| 927 | void |
| 928 | module_arch_cleanup (struct module *mod) |
| 929 | { |
| 930 | if (mod->arch.init_unw_table) |
| 931 | unw_remove_unwind_table(mod->arch.init_unw_table); |
| 932 | if (mod->arch.core_unw_table) |
| 933 | unw_remove_unwind_table(mod->arch.core_unw_table); |
| 934 | } |