Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Kernel dynamically loadable module help for PARISC. |
| 2 | * |
| 3 | * The best reference for this stuff is probably the Processor- |
| 4 | * Specific ELF Supplement for PA-RISC: |
| 5 | * http://ftp.parisc-linux.org/docs/arch/elf-pa-hp.pdf |
| 6 | * |
| 7 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) |
| 8 | * Copyright (C) 2003 Randolph Chung <tausq at debian . org> |
| 9 | * |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 24 | * |
| 25 | * |
| 26 | * Notes: |
| 27 | * - SEGREL32 handling |
| 28 | * We are not doing SEGREL32 handling correctly. According to the ABI, we |
| 29 | * should do a value offset, like this: |
| 30 | * if (is_init(me, (void *)val)) |
| 31 | * val -= (uint32_t)me->module_init; |
| 32 | * else |
| 33 | * val -= (uint32_t)me->module_core; |
| 34 | * However, SEGREL32 is used only for PARISC unwind entries, and we want |
| 35 | * those entries to have an absolute address, and not just an offset. |
| 36 | * |
| 37 | * The unwind table mechanism has the ability to specify an offset for |
| 38 | * the unwind table; however, because we split off the init functions into |
| 39 | * a different piece of memory, it is not possible to do this using a |
| 40 | * single offset. Instead, we use the above hack for now. |
| 41 | */ |
| 42 | |
| 43 | #include <linux/moduleloader.h> |
| 44 | #include <linux/elf.h> |
| 45 | #include <linux/vmalloc.h> |
| 46 | #include <linux/fs.h> |
| 47 | #include <linux/string.h> |
| 48 | #include <linux/kernel.h> |
| 49 | |
| 50 | #include <asm/unwind.h> |
| 51 | |
| 52 | #if 0 |
| 53 | #define DEBUGP printk |
| 54 | #else |
| 55 | #define DEBUGP(fmt...) |
| 56 | #endif |
| 57 | |
| 58 | #define CHECK_RELOC(val, bits) \ |
| 59 | if ( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \ |
| 60 | ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) { \ |
| 61 | printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \ |
| 62 | me->name, strtab + sym->st_name, (unsigned long)val, bits); \ |
| 63 | return -ENOEXEC; \ |
| 64 | } |
| 65 | |
| 66 | /* Maximum number of GOT entries. We use a long displacement ldd from |
| 67 | * the bottom of the table, which has a maximum signed displacement of |
| 68 | * 0x3fff; however, since we're only going forward, this becomes |
| 69 | * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have |
| 70 | * at most 1023 entries */ |
| 71 | #define MAX_GOTS 1023 |
| 72 | |
| 73 | /* three functions to determine where in the module core |
| 74 | * or init pieces the location is */ |
| 75 | static inline int is_init(struct module *me, void *loc) |
| 76 | { |
| 77 | return (loc >= me->module_init && |
| 78 | loc <= (me->module_init + me->init_size)); |
| 79 | } |
| 80 | |
| 81 | static inline int is_core(struct module *me, void *loc) |
| 82 | { |
| 83 | return (loc >= me->module_core && |
| 84 | loc <= (me->module_core + me->core_size)); |
| 85 | } |
| 86 | |
| 87 | static inline int is_local(struct module *me, void *loc) |
| 88 | { |
| 89 | return is_init(me, loc) || is_core(me, loc); |
| 90 | } |
| 91 | |
| 92 | |
| 93 | #ifndef __LP64__ |
| 94 | struct got_entry { |
| 95 | Elf32_Addr addr; |
| 96 | }; |
| 97 | |
| 98 | #define Elf_Fdesc Elf32_Fdesc |
| 99 | |
| 100 | struct stub_entry { |
| 101 | Elf32_Word insns[2]; /* each stub entry has two insns */ |
| 102 | }; |
| 103 | #else |
| 104 | struct got_entry { |
| 105 | Elf64_Addr addr; |
| 106 | }; |
| 107 | |
| 108 | #define Elf_Fdesc Elf64_Fdesc |
| 109 | |
| 110 | struct stub_entry { |
| 111 | Elf64_Word insns[4]; /* each stub entry has four insns */ |
| 112 | }; |
| 113 | #endif |
| 114 | |
| 115 | /* Field selection types defined by hppa */ |
| 116 | #define rnd(x) (((x)+0x1000)&~0x1fff) |
| 117 | /* fsel: full 32 bits */ |
| 118 | #define fsel(v,a) ((v)+(a)) |
| 119 | /* lsel: select left 21 bits */ |
| 120 | #define lsel(v,a) (((v)+(a))>>11) |
| 121 | /* rsel: select right 11 bits */ |
| 122 | #define rsel(v,a) (((v)+(a))&0x7ff) |
| 123 | /* lrsel with rounding of addend to nearest 8k */ |
| 124 | #define lrsel(v,a) (((v)+rnd(a))>>11) |
| 125 | /* rrsel with rounding of addend to nearest 8k */ |
| 126 | #define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a))) |
| 127 | |
| 128 | #define mask(x,sz) ((x) & ~((1<<(sz))-1)) |
| 129 | |
| 130 | |
| 131 | /* The reassemble_* functions prepare an immediate value for |
| 132 | insertion into an opcode. pa-risc uses all sorts of weird bitfields |
| 133 | in the instruction to hold the value. */ |
| 134 | static inline int reassemble_14(int as14) |
| 135 | { |
| 136 | return (((as14 & 0x1fff) << 1) | |
| 137 | ((as14 & 0x2000) >> 13)); |
| 138 | } |
| 139 | |
| 140 | static inline int reassemble_17(int as17) |
| 141 | { |
| 142 | return (((as17 & 0x10000) >> 16) | |
| 143 | ((as17 & 0x0f800) << 5) | |
| 144 | ((as17 & 0x00400) >> 8) | |
| 145 | ((as17 & 0x003ff) << 3)); |
| 146 | } |
| 147 | |
| 148 | static inline int reassemble_21(int as21) |
| 149 | { |
| 150 | return (((as21 & 0x100000) >> 20) | |
| 151 | ((as21 & 0x0ffe00) >> 8) | |
| 152 | ((as21 & 0x000180) << 7) | |
| 153 | ((as21 & 0x00007c) << 14) | |
| 154 | ((as21 & 0x000003) << 12)); |
| 155 | } |
| 156 | |
| 157 | static inline int reassemble_22(int as22) |
| 158 | { |
| 159 | return (((as22 & 0x200000) >> 21) | |
| 160 | ((as22 & 0x1f0000) << 5) | |
| 161 | ((as22 & 0x00f800) << 5) | |
| 162 | ((as22 & 0x000400) >> 8) | |
| 163 | ((as22 & 0x0003ff) << 3)); |
| 164 | } |
| 165 | |
| 166 | void *module_alloc(unsigned long size) |
| 167 | { |
| 168 | if (size == 0) |
| 169 | return NULL; |
| 170 | return vmalloc(size); |
| 171 | } |
| 172 | |
| 173 | #ifndef __LP64__ |
| 174 | static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) |
| 175 | { |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) |
| 180 | { |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) |
| 185 | { |
| 186 | unsigned long cnt = 0; |
| 187 | |
| 188 | for (; n > 0; n--, rela++) |
| 189 | { |
| 190 | switch (ELF32_R_TYPE(rela->r_info)) { |
| 191 | case R_PARISC_PCREL17F: |
| 192 | case R_PARISC_PCREL22F: |
| 193 | cnt++; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | return cnt; |
| 198 | } |
| 199 | #else |
| 200 | static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) |
| 201 | { |
| 202 | unsigned long cnt = 0; |
| 203 | |
| 204 | for (; n > 0; n--, rela++) |
| 205 | { |
| 206 | switch (ELF64_R_TYPE(rela->r_info)) { |
| 207 | case R_PARISC_LTOFF21L: |
| 208 | case R_PARISC_LTOFF14R: |
| 209 | case R_PARISC_PCREL22F: |
| 210 | cnt++; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | return cnt; |
| 215 | } |
| 216 | |
| 217 | static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) |
| 218 | { |
| 219 | unsigned long cnt = 0; |
| 220 | |
| 221 | for (; n > 0; n--, rela++) |
| 222 | { |
| 223 | switch (ELF64_R_TYPE(rela->r_info)) { |
| 224 | case R_PARISC_FPTR64: |
| 225 | cnt++; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | return cnt; |
| 230 | } |
| 231 | |
| 232 | static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) |
| 233 | { |
| 234 | unsigned long cnt = 0; |
| 235 | |
| 236 | for (; n > 0; n--, rela++) |
| 237 | { |
| 238 | switch (ELF64_R_TYPE(rela->r_info)) { |
| 239 | case R_PARISC_PCREL22F: |
| 240 | cnt++; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | return cnt; |
| 245 | } |
| 246 | #endif |
| 247 | |
| 248 | |
| 249 | /* Free memory returned from module_alloc */ |
| 250 | void module_free(struct module *mod, void *module_region) |
| 251 | { |
| 252 | vfree(module_region); |
| 253 | /* FIXME: If module_region == mod->init_region, trim exception |
| 254 | table entries. */ |
| 255 | } |
| 256 | |
| 257 | #define CONST |
| 258 | int module_frob_arch_sections(CONST Elf_Ehdr *hdr, |
| 259 | CONST Elf_Shdr *sechdrs, |
| 260 | CONST char *secstrings, |
| 261 | struct module *me) |
| 262 | { |
| 263 | unsigned long gots = 0, fdescs = 0, stubs = 0, init_stubs = 0; |
| 264 | unsigned int i; |
| 265 | |
| 266 | for (i = 1; i < hdr->e_shnum; i++) { |
| 267 | const Elf_Rela *rels = (void *)hdr + sechdrs[i].sh_offset; |
| 268 | unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels); |
| 269 | |
| 270 | if (strncmp(secstrings + sechdrs[i].sh_name, |
| 271 | ".PARISC.unwind", 14) == 0) |
| 272 | me->arch.unwind_section = i; |
| 273 | |
| 274 | if (sechdrs[i].sh_type != SHT_RELA) |
| 275 | continue; |
| 276 | |
| 277 | /* some of these are not relevant for 32-bit/64-bit |
| 278 | * we leave them here to make the code common. the |
| 279 | * compiler will do its thing and optimize out the |
| 280 | * stuff we don't need |
| 281 | */ |
| 282 | gots += count_gots(rels, nrels); |
| 283 | fdescs += count_fdescs(rels, nrels); |
| 284 | if(strncmp(secstrings + sechdrs[i].sh_name, |
| 285 | ".rela.init", 10) == 0) |
| 286 | init_stubs += count_stubs(rels, nrels); |
| 287 | else |
| 288 | stubs += count_stubs(rels, nrels); |
| 289 | } |
| 290 | |
| 291 | /* align things a bit */ |
| 292 | me->core_size = ALIGN(me->core_size, 16); |
| 293 | me->arch.got_offset = me->core_size; |
| 294 | me->core_size += gots * sizeof(struct got_entry); |
| 295 | |
| 296 | me->core_size = ALIGN(me->core_size, 16); |
| 297 | me->arch.fdesc_offset = me->core_size; |
| 298 | me->core_size += fdescs * sizeof(Elf_Fdesc); |
| 299 | |
| 300 | me->core_size = ALIGN(me->core_size, 16); |
| 301 | me->arch.stub_offset = me->core_size; |
| 302 | me->core_size += stubs * sizeof(struct stub_entry); |
| 303 | |
| 304 | me->init_size = ALIGN(me->init_size, 16); |
| 305 | me->arch.init_stub_offset = me->init_size; |
| 306 | me->init_size += init_stubs * sizeof(struct stub_entry); |
| 307 | |
| 308 | me->arch.got_max = gots; |
| 309 | me->arch.fdesc_max = fdescs; |
| 310 | me->arch.stub_max = stubs; |
| 311 | me->arch.init_stub_max = init_stubs; |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | #ifdef __LP64__ |
| 317 | static Elf64_Word get_got(struct module *me, unsigned long value, long addend) |
| 318 | { |
| 319 | unsigned int i; |
| 320 | struct got_entry *got; |
| 321 | |
| 322 | value += addend; |
| 323 | |
| 324 | BUG_ON(value == 0); |
| 325 | |
| 326 | got = me->module_core + me->arch.got_offset; |
| 327 | for (i = 0; got[i].addr; i++) |
| 328 | if (got[i].addr == value) |
| 329 | goto out; |
| 330 | |
| 331 | BUG_ON(++me->arch.got_count > me->arch.got_max); |
| 332 | |
| 333 | got[i].addr = value; |
| 334 | out: |
| 335 | DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry), |
| 336 | value); |
| 337 | return i * sizeof(struct got_entry); |
| 338 | } |
| 339 | #endif /* __LP64__ */ |
| 340 | |
| 341 | #ifdef __LP64__ |
| 342 | static Elf_Addr get_fdesc(struct module *me, unsigned long value) |
| 343 | { |
| 344 | Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset; |
| 345 | |
| 346 | if (!value) { |
| 347 | printk(KERN_ERR "%s: zero OPD requested!\n", me->name); |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | /* Look for existing fdesc entry. */ |
| 352 | while (fdesc->addr) { |
| 353 | if (fdesc->addr == value) |
| 354 | return (Elf_Addr)fdesc; |
| 355 | fdesc++; |
| 356 | } |
| 357 | |
| 358 | BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max); |
| 359 | |
| 360 | /* Create new one */ |
| 361 | fdesc->addr = value; |
| 362 | fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset; |
| 363 | return (Elf_Addr)fdesc; |
| 364 | } |
| 365 | #endif /* __LP64__ */ |
| 366 | |
| 367 | static Elf_Addr get_stub(struct module *me, unsigned long value, long addend, |
| 368 | int millicode, int init_section) |
| 369 | { |
| 370 | unsigned long i; |
| 371 | struct stub_entry *stub; |
| 372 | |
| 373 | if(init_section) { |
| 374 | i = me->arch.init_stub_count++; |
| 375 | BUG_ON(me->arch.init_stub_count > me->arch.init_stub_max); |
| 376 | stub = me->module_init + me->arch.init_stub_offset + |
| 377 | i * sizeof(struct stub_entry); |
| 378 | } else { |
| 379 | i = me->arch.stub_count++; |
| 380 | BUG_ON(me->arch.stub_count > me->arch.stub_max); |
| 381 | stub = me->module_core + me->arch.stub_offset + |
| 382 | i * sizeof(struct stub_entry); |
| 383 | } |
| 384 | |
| 385 | #ifndef __LP64__ |
| 386 | /* for 32-bit the stub looks like this: |
| 387 | * ldil L'XXX,%r1 |
| 388 | * be,n R'XXX(%sr4,%r1) |
| 389 | */ |
| 390 | //value = *(unsigned long *)((value + addend) & ~3); /* why? */ |
| 391 | |
| 392 | stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */ |
| 393 | stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */ |
| 394 | |
| 395 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); |
| 396 | stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4); |
| 397 | |
| 398 | #else |
| 399 | /* for 64-bit we have two kinds of stubs: |
| 400 | * for normal function calls: |
| 401 | * ldd 0(%dp),%dp |
| 402 | * ldd 10(%dp), %r1 |
| 403 | * bve (%r1) |
| 404 | * ldd 18(%dp), %dp |
| 405 | * |
| 406 | * for millicode: |
| 407 | * ldil 0, %r1 |
| 408 | * ldo 0(%r1), %r1 |
| 409 | * ldd 10(%r1), %r1 |
| 410 | * bve,n (%r1) |
| 411 | */ |
| 412 | if (!millicode) |
| 413 | { |
| 414 | stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */ |
| 415 | stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */ |
| 416 | stub->insns[2] = 0xe820d000; /* bve (%r1) */ |
| 417 | stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */ |
| 418 | |
| 419 | stub->insns[0] |= reassemble_14(get_got(me, value, addend) & 0x3fff); |
| 420 | } |
| 421 | else |
| 422 | { |
| 423 | stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ |
| 424 | stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ |
| 425 | stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */ |
| 426 | stub->insns[3] = 0xe820d002; /* bve,n (%r1) */ |
| 427 | |
| 428 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); |
| 429 | stub->insns[1] |= reassemble_14(rrsel(value, addend)); |
| 430 | } |
| 431 | #endif |
| 432 | |
| 433 | return (Elf_Addr)stub; |
| 434 | } |
| 435 | |
| 436 | int apply_relocate(Elf_Shdr *sechdrs, |
| 437 | const char *strtab, |
| 438 | unsigned int symindex, |
| 439 | unsigned int relsec, |
| 440 | struct module *me) |
| 441 | { |
| 442 | /* parisc should not need this ... */ |
| 443 | printk(KERN_ERR "module %s: RELOCATION unsupported\n", |
| 444 | me->name); |
| 445 | return -ENOEXEC; |
| 446 | } |
| 447 | |
| 448 | #ifndef __LP64__ |
| 449 | int apply_relocate_add(Elf_Shdr *sechdrs, |
| 450 | const char *strtab, |
| 451 | unsigned int symindex, |
| 452 | unsigned int relsec, |
| 453 | struct module *me) |
| 454 | { |
| 455 | int i; |
| 456 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
| 457 | Elf32_Sym *sym; |
| 458 | Elf32_Word *loc; |
| 459 | Elf32_Addr val; |
| 460 | Elf32_Sword addend; |
| 461 | Elf32_Addr dot; |
| 462 | //unsigned long dp = (unsigned long)$global$; |
| 463 | register unsigned long dp asm ("r27"); |
| 464 | |
| 465 | DEBUGP("Applying relocate section %u to %u\n", relsec, |
| 466 | sechdrs[relsec].sh_info); |
| 467 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 468 | /* This is where to make the change */ |
| 469 | loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
| 470 | + rel[i].r_offset; |
| 471 | /* This is the symbol it is referring to */ |
| 472 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
| 473 | + ELF32_R_SYM(rel[i].r_info); |
| 474 | if (!sym->st_value) { |
| 475 | printk(KERN_WARNING "%s: Unknown symbol %s\n", |
| 476 | me->name, strtab + sym->st_name); |
| 477 | return -ENOENT; |
| 478 | } |
| 479 | //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; |
| 480 | dot = (Elf32_Addr)loc & ~0x03; |
| 481 | |
| 482 | val = sym->st_value; |
| 483 | addend = rel[i].r_addend; |
| 484 | |
| 485 | #if 0 |
| 486 | #define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t : |
| 487 | DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n", |
| 488 | strtab + sym->st_name, |
| 489 | (uint32_t)loc, val, addend, |
| 490 | r(R_PARISC_PLABEL32) |
| 491 | r(R_PARISC_DIR32) |
| 492 | r(R_PARISC_DIR21L) |
| 493 | r(R_PARISC_DIR14R) |
| 494 | r(R_PARISC_SEGREL32) |
| 495 | r(R_PARISC_DPREL21L) |
| 496 | r(R_PARISC_DPREL14R) |
| 497 | r(R_PARISC_PCREL17F) |
| 498 | r(R_PARISC_PCREL22F) |
| 499 | "UNKNOWN"); |
| 500 | #undef r |
| 501 | #endif |
| 502 | |
| 503 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
| 504 | case R_PARISC_PLABEL32: |
| 505 | /* 32-bit function address */ |
| 506 | /* no function descriptors... */ |
| 507 | *loc = fsel(val, addend); |
| 508 | break; |
| 509 | case R_PARISC_DIR32: |
| 510 | /* direct 32-bit ref */ |
| 511 | *loc = fsel(val, addend); |
| 512 | break; |
| 513 | case R_PARISC_DIR21L: |
| 514 | /* left 21 bits of effective address */ |
| 515 | val = lrsel(val, addend); |
| 516 | *loc = mask(*loc, 21) | reassemble_21(val); |
| 517 | break; |
| 518 | case R_PARISC_DIR14R: |
| 519 | /* right 14 bits of effective address */ |
| 520 | val = rrsel(val, addend); |
| 521 | *loc = mask(*loc, 14) | reassemble_14(val); |
| 522 | break; |
| 523 | case R_PARISC_SEGREL32: |
| 524 | /* 32-bit segment relative address */ |
| 525 | /* See note about special handling of SEGREL32 at |
| 526 | * the beginning of this file. |
| 527 | */ |
| 528 | *loc = fsel(val, addend); |
| 529 | break; |
| 530 | case R_PARISC_DPREL21L: |
| 531 | /* left 21 bit of relative address */ |
| 532 | val = lrsel(val - dp, addend); |
| 533 | *loc = mask(*loc, 21) | reassemble_21(val); |
| 534 | break; |
| 535 | case R_PARISC_DPREL14R: |
| 536 | /* right 14 bit of relative address */ |
| 537 | val = rrsel(val - dp, addend); |
| 538 | *loc = mask(*loc, 14) | reassemble_14(val); |
| 539 | break; |
| 540 | case R_PARISC_PCREL17F: |
| 541 | /* 17-bit PC relative address */ |
| 542 | val = get_stub(me, val, addend, 0, is_init(me, loc)); |
| 543 | val = (val - dot - 8)/4; |
| 544 | CHECK_RELOC(val, 17) |
| 545 | *loc = (*loc & ~0x1f1ffd) | reassemble_17(val); |
| 546 | break; |
| 547 | case R_PARISC_PCREL22F: |
| 548 | /* 22-bit PC relative address; only defined for pa20 */ |
| 549 | val = get_stub(me, val, addend, 0, is_init(me, loc)); |
| 550 | DEBUGP("STUB FOR %s loc %lx+%lx at %lx\n", |
| 551 | strtab + sym->st_name, (unsigned long)loc, addend, |
| 552 | val) |
| 553 | val = (val - dot - 8)/4; |
| 554 | CHECK_RELOC(val, 22); |
| 555 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
| 556 | break; |
| 557 | |
| 558 | default: |
| 559 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", |
| 560 | me->name, ELF32_R_TYPE(rel[i].r_info)); |
| 561 | return -ENOEXEC; |
| 562 | } |
| 563 | } |
| 564 | |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | #else |
| 569 | int apply_relocate_add(Elf_Shdr *sechdrs, |
| 570 | const char *strtab, |
| 571 | unsigned int symindex, |
| 572 | unsigned int relsec, |
| 573 | struct module *me) |
| 574 | { |
| 575 | int i; |
| 576 | Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
| 577 | Elf64_Sym *sym; |
| 578 | Elf64_Word *loc; |
| 579 | Elf64_Xword *loc64; |
| 580 | Elf64_Addr val; |
| 581 | Elf64_Sxword addend; |
| 582 | Elf64_Addr dot; |
| 583 | |
| 584 | DEBUGP("Applying relocate section %u to %u\n", relsec, |
| 585 | sechdrs[relsec].sh_info); |
| 586 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 587 | /* This is where to make the change */ |
| 588 | loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
| 589 | + rel[i].r_offset; |
| 590 | /* This is the symbol it is referring to */ |
| 591 | sym = (Elf64_Sym *)sechdrs[symindex].sh_addr |
| 592 | + ELF64_R_SYM(rel[i].r_info); |
| 593 | if (!sym->st_value) { |
| 594 | printk(KERN_WARNING "%s: Unknown symbol %s\n", |
| 595 | me->name, strtab + sym->st_name); |
| 596 | return -ENOENT; |
| 597 | } |
| 598 | //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; |
| 599 | dot = (Elf64_Addr)loc & ~0x03; |
| 600 | loc64 = (Elf64_Xword *)loc; |
| 601 | |
| 602 | val = sym->st_value; |
| 603 | addend = rel[i].r_addend; |
| 604 | |
| 605 | #if 0 |
| 606 | #define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t : |
| 607 | printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n", |
| 608 | strtab + sym->st_name, |
| 609 | loc, val, addend, |
| 610 | r(R_PARISC_LTOFF14R) |
| 611 | r(R_PARISC_LTOFF21L) |
| 612 | r(R_PARISC_PCREL22F) |
| 613 | r(R_PARISC_DIR64) |
| 614 | r(R_PARISC_SEGREL32) |
| 615 | r(R_PARISC_FPTR64) |
| 616 | "UNKNOWN"); |
| 617 | #undef r |
| 618 | #endif |
| 619 | |
| 620 | switch (ELF64_R_TYPE(rel[i].r_info)) { |
| 621 | case R_PARISC_LTOFF21L: |
| 622 | /* LT-relative; left 21 bits */ |
| 623 | val = get_got(me, val, addend); |
| 624 | DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n", |
| 625 | strtab + sym->st_name, |
| 626 | loc, val); |
| 627 | val = lrsel(val, 0); |
| 628 | *loc = mask(*loc, 21) | reassemble_21(val); |
| 629 | break; |
| 630 | case R_PARISC_LTOFF14R: |
| 631 | /* L(ltoff(val+addend)) */ |
| 632 | /* LT-relative; right 14 bits */ |
| 633 | val = get_got(me, val, addend); |
| 634 | val = rrsel(val, 0); |
| 635 | DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n", |
| 636 | strtab + sym->st_name, |
| 637 | loc, val); |
| 638 | *loc = mask(*loc, 14) | reassemble_14(val); |
| 639 | break; |
| 640 | case R_PARISC_PCREL22F: |
| 641 | /* PC-relative; 22 bits */ |
| 642 | DEBUGP("PCREL22F Symbol %s loc %p val %lx\n", |
| 643 | strtab + sym->st_name, |
| 644 | loc, val); |
| 645 | /* can we reach it locally? */ |
| 646 | if(!is_local(me, (void *)val)) { |
| 647 | if (strncmp(strtab + sym->st_name, "$$", 2) |
| 648 | == 0) |
| 649 | val = get_stub(me, val, addend, 1, |
| 650 | is_init(me, loc)); |
| 651 | else |
| 652 | val = get_stub(me, val, addend, 0, |
| 653 | is_init(me, loc)); |
| 654 | } |
| 655 | DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n", |
| 656 | strtab + sym->st_name, loc, sym->st_value, |
| 657 | addend, val); |
| 658 | /* FIXME: local symbols work as long as the |
| 659 | * core and init pieces aren't separated too |
| 660 | * far. If this is ever broken, you will trip |
| 661 | * the check below. The way to fix it would |
| 662 | * be to generate local stubs to go between init |
| 663 | * and core */ |
| 664 | if((Elf64_Sxword)(val - dot - 8) > 0x800000 -1 || |
| 665 | (Elf64_Sxword)(val - dot - 8) < -0x800000) { |
| 666 | printk(KERN_ERR "Module %s, symbol %s is out of range for PCREL22F relocation\n", |
| 667 | me->name, strtab + sym->st_name); |
| 668 | return -ENOEXEC; |
| 669 | } |
| 670 | val = (val - dot - 8)/4; |
| 671 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
| 672 | break; |
| 673 | case R_PARISC_DIR64: |
| 674 | /* 64-bit effective address */ |
| 675 | *loc64 = val + addend; |
| 676 | break; |
| 677 | case R_PARISC_SEGREL32: |
| 678 | /* 32-bit segment relative address */ |
| 679 | /* See note about special handling of SEGREL32 at |
| 680 | * the beginning of this file. |
| 681 | */ |
| 682 | *loc = fsel(val, addend); |
| 683 | break; |
| 684 | case R_PARISC_FPTR64: |
| 685 | /* 64-bit function address */ |
| 686 | if(is_local(me, (void *)(val + addend))) { |
| 687 | *loc64 = get_fdesc(me, val+addend); |
| 688 | DEBUGP("FDESC for %s at %p points to %lx\n", |
| 689 | strtab + sym->st_name, *loc64, |
| 690 | ((Elf_Fdesc *)*loc64)->addr); |
| 691 | } else { |
| 692 | /* if the symbol is not local to this |
| 693 | * module then val+addend is a pointer |
| 694 | * to the function descriptor */ |
| 695 | DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n", |
| 696 | strtab + sym->st_name, |
| 697 | loc, val); |
| 698 | *loc64 = val + addend; |
| 699 | } |
| 700 | break; |
| 701 | |
| 702 | default: |
| 703 | printk(KERN_ERR "module %s: Unknown relocation: %Lu\n", |
| 704 | me->name, ELF64_R_TYPE(rel[i].r_info)); |
| 705 | return -ENOEXEC; |
| 706 | } |
| 707 | } |
| 708 | return 0; |
| 709 | } |
| 710 | #endif |
| 711 | |
| 712 | static void |
| 713 | register_unwind_table(struct module *me, |
| 714 | const Elf_Shdr *sechdrs) |
| 715 | { |
| 716 | unsigned char *table, *end; |
| 717 | unsigned long gp; |
| 718 | |
| 719 | if (!me->arch.unwind_section) |
| 720 | return; |
| 721 | |
| 722 | table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr; |
| 723 | end = table + sechdrs[me->arch.unwind_section].sh_size; |
| 724 | gp = (Elf_Addr)me->module_core + me->arch.got_offset; |
| 725 | |
| 726 | DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n", |
| 727 | me->arch.unwind_section, table, end, gp); |
| 728 | me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end); |
| 729 | } |
| 730 | |
| 731 | static void |
| 732 | deregister_unwind_table(struct module *me) |
| 733 | { |
| 734 | if (me->arch.unwind) |
| 735 | unwind_table_remove(me->arch.unwind); |
| 736 | } |
| 737 | |
| 738 | int module_finalize(const Elf_Ehdr *hdr, |
| 739 | const Elf_Shdr *sechdrs, |
| 740 | struct module *me) |
| 741 | { |
| 742 | int i; |
| 743 | unsigned long nsyms; |
| 744 | const char *strtab = NULL; |
| 745 | Elf_Sym *newptr, *oldptr; |
| 746 | Elf_Shdr *symhdr = NULL; |
| 747 | #ifdef DEBUG |
| 748 | Elf_Fdesc *entry; |
| 749 | u32 *addr; |
| 750 | |
| 751 | entry = (Elf_Fdesc *)me->init; |
| 752 | printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry, |
| 753 | entry->gp, entry->addr); |
| 754 | addr = (u32 *)entry->addr; |
| 755 | printk("INSNS: %x %x %x %x\n", |
| 756 | addr[0], addr[1], addr[2], addr[3]); |
| 757 | printk("stubs used %ld, stubs max %ld\n" |
| 758 | "init_stubs used %ld, init stubs max %ld\n" |
| 759 | "got entries used %ld, gots max %ld\n" |
| 760 | "fdescs used %ld, fdescs max %ld\n", |
| 761 | me->arch.stub_count, me->arch.stub_max, |
| 762 | me->arch.init_stub_count, me->arch.init_stub_max, |
| 763 | me->arch.got_count, me->arch.got_max, |
| 764 | me->arch.fdesc_count, me->arch.fdesc_max); |
| 765 | #endif |
| 766 | |
| 767 | register_unwind_table(me, sechdrs); |
| 768 | |
| 769 | /* haven't filled in me->symtab yet, so have to find it |
| 770 | * ourselves */ |
| 771 | for (i = 1; i < hdr->e_shnum; i++) { |
| 772 | if(sechdrs[i].sh_type == SHT_SYMTAB |
| 773 | && (sechdrs[i].sh_type & SHF_ALLOC)) { |
| 774 | int strindex = sechdrs[i].sh_link; |
| 775 | /* FIXME: AWFUL HACK |
| 776 | * The cast is to drop the const from |
| 777 | * the sechdrs pointer */ |
| 778 | symhdr = (Elf_Shdr *)&sechdrs[i]; |
| 779 | strtab = (char *)sechdrs[strindex].sh_addr; |
| 780 | break; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | DEBUGP("module %s: strtab %p, symhdr %p\n", |
| 785 | me->name, strtab, symhdr); |
| 786 | |
| 787 | if(me->arch.got_count > MAX_GOTS) { |
| 788 | printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d\n", me->name, me->arch.got_count, MAX_GOTS); |
| 789 | return -EINVAL; |
| 790 | } |
| 791 | |
| 792 | /* no symbol table */ |
| 793 | if(symhdr == NULL) |
| 794 | return 0; |
| 795 | |
| 796 | oldptr = (void *)symhdr->sh_addr; |
| 797 | newptr = oldptr + 1; /* we start counting at 1 */ |
| 798 | nsyms = symhdr->sh_size / sizeof(Elf_Sym); |
| 799 | DEBUGP("OLD num_symtab %lu\n", nsyms); |
| 800 | |
| 801 | for (i = 1; i < nsyms; i++) { |
| 802 | oldptr++; /* note, count starts at 1 so preincrement */ |
| 803 | if(strncmp(strtab + oldptr->st_name, |
| 804 | ".L", 2) == 0) |
| 805 | continue; |
| 806 | |
| 807 | if(newptr != oldptr) |
| 808 | *newptr++ = *oldptr; |
| 809 | else |
| 810 | newptr++; |
| 811 | |
| 812 | } |
| 813 | nsyms = newptr - (Elf_Sym *)symhdr->sh_addr; |
| 814 | DEBUGP("NEW num_symtab %lu\n", nsyms); |
| 815 | symhdr->sh_size = nsyms * sizeof(Elf_Sym); |
| 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | void module_arch_cleanup(struct module *mod) |
| 820 | { |
| 821 | deregister_unwind_table(mod); |
| 822 | } |