elf2ecoff.c revision 1.27
1/* $NetBSD: elf2ecoff.c,v 1.27 2011/06/28 13:13:15 tsutsui Exp $ */ 2 3/* 4 * Copyright (c) 1997 Jonathan Stone 5 * All rights reserved. 6 * Copyright (c) 1995 7 * Ted Lemon (hereinafter referred to as the author) 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* elf2ecoff.c 34 35 This program converts an elf executable to an ECOFF executable. 36 No symbol table is retained. This is useful primarily in building 37 net-bootable kernels for machines (e.g., DECstation and Alpha) which 38 only support the ECOFF object file format. */ 39 40#if HAVE_NBTOOL_CONFIG_H 41#include "nbtool_config.h" 42#endif 43 44#include <sys/types.h> 45#include <err.h> 46#include <errno.h> 47#include <fcntl.h> 48#include <unistd.h> 49#include <sys/exec_elf.h> 50#include <stdio.h> 51#include <sys/exec_ecoff.h> 52#include <stdlib.h> 53#include <string.h> 54#include <limits.h> 55 56#define ISLAST(p) (p->n_un.n_name == 0 || p->n_un.n_name[0] == 0) 57 58struct sect { 59 unsigned long vaddr; 60 unsigned long len; 61}; 62 63struct elf_syms { 64 int nsymbols; 65 Elf32_Sym *elf_syms; 66 off_t stringsize; 67 char *stringtab; 68}; 69 70struct ecoff_syms { 71 int nsymbols; 72 struct ecoff_extsym *ecoff_syms; 73 off_t stringsize; 74 char *stringtab; 75}; 76 77int debug = 0; 78 79int phcmp(Elf32_Phdr * h1, Elf32_Phdr * h2); 80 81 82char *saveRead(int file, off_t offset, off_t len, const char *name); 83void safewrite(int outfile, const void *buf, off_t len, const char *msg); 84void copy(int, int, off_t, off_t); 85void combine(struct sect * base, struct sect * new, int paddable); 86void translate_syms(struct elf_syms *, struct ecoff_syms *); 87void elf_symbol_table_to_ecoff(int out, int in, 88 struct ecoff_exechdr * ep, 89 off_t symoff, off_t symsize, 90 off_t stroff, off_t strsize); 91 92 93int make_ecoff_section_hdrs(struct ecoff_exechdr * ep, 94 struct ecoff_scnhdr * esecs); 95 96void write_ecoff_symhdr(int outfile, struct ecoff_exechdr * ep, 97 struct ecoff_symhdr * symhdrp, 98 long nesyms, long extsymoff, long extstroff, 99 long strsize); 100 101void pad16(int fd, int size, const char *msg); 102void bswap32_region(int32_t* , int); 103 104int *symTypeTable; 105int needswap; 106 107 108 109 110void elf_read_syms(struct elf_syms * elfsymsp, int infile, 111 off_t symoff, off_t symsize, off_t stroff, off_t strsize); 112 113 114int 115main(int argc, char **argv, char **envp) 116{ 117 Elf32_Ehdr ex; 118 Elf32_Phdr *ph; 119 Elf32_Shdr *sh; 120 char *shstrtab; 121 int strtabix, symtabix; 122 size_t i; 123 int pad; 124 struct sect text, data, bss; /* a.out-compatible sections */ 125 struct sect rdata, sdata, sbss; /* ECOFF-only sections */ 126 127 struct ecoff_exechdr ep; 128 struct ecoff_scnhdr esecs[6]; 129 struct ecoff_symhdr symhdr; 130 131 int infile, outfile; 132 unsigned long cur_vma = ULONG_MAX; 133 int symflag = 0; 134 int nsecs = 0; 135 int mipsel; 136 137 138 text.len = data.len = bss.len = 0; 139 text.vaddr = data.vaddr = bss.vaddr = 0; 140 141 rdata.len = sdata.len = sbss.len = 0; 142 rdata.vaddr = sdata.vaddr = sbss.vaddr = 0; 143 144 /* Check args... */ 145 if (argc < 3 || argc > 4) { 146usage: 147 fprintf(stderr, 148 "usage: elf2ecoff <elf executable> <ECOFF executable> [-s]\n"); 149 exit(1); 150 } 151 if (argc == 4) { 152 if (strcmp(argv[3], "-s")) 153 goto usage; 154 symflag = 1; 155 } 156 /* Try the input file... */ 157 if ((infile = open(argv[1], O_RDONLY)) < 0) { 158 fprintf(stderr, "Can't open %s for read: %s\n", 159 argv[1], strerror(errno)); 160 exit(1); 161 } 162 /* Read the header, which is at the beginning of the file... */ 163 i = read(infile, &ex, sizeof ex); 164 if (i != sizeof ex) { 165 fprintf(stderr, "ex: %s: %s.\n", 166 argv[1], i ? strerror(errno) : "End of file reached"); 167 exit(1); 168 } 169 if (ex.e_ident[EI_DATA] == ELFDATA2LSB) 170 mipsel = 1; 171 else if (ex.e_ident[EI_DATA] == ELFDATA2MSB) 172 mipsel = 0; 173 else { 174 fprintf(stderr, "invalid ELF byte order %d\n", 175 ex.e_ident[EI_DATA]); 176 exit(1); 177 } 178#if BYTE_ORDER == BIG_ENDIAN 179 if (mipsel) 180 needswap = 1; 181 else 182 needswap = 0; 183#elif BYTE_ORDER == LITTLE_ENDIAN 184 if (mipsel) 185 needswap = 0; 186 else 187 needswap = 1; 188#else 189#error "unknown endian" 190#endif 191 192 if (needswap) { 193 ex.e_type = bswap16(ex.e_type); 194 ex.e_machine = bswap16(ex.e_machine); 195 ex.e_version = bswap32(ex.e_version); 196 ex.e_entry = bswap32(ex.e_entry); 197 ex.e_phoff = bswap32(ex.e_phoff); 198 ex.e_shoff = bswap32(ex.e_shoff); 199 ex.e_flags = bswap32(ex.e_flags); 200 ex.e_ehsize = bswap16(ex.e_ehsize); 201 ex.e_phentsize = bswap16(ex.e_phentsize); 202 ex.e_phnum = bswap16(ex.e_phnum); 203 ex.e_shentsize = bswap16(ex.e_shentsize); 204 ex.e_shnum = bswap16(ex.e_shnum); 205 ex.e_shstrndx = bswap16(ex.e_shstrndx); 206 } 207 208 /* Read the program headers... */ 209 ph = (Elf32_Phdr *) saveRead(infile, ex.e_phoff, 210 ex.e_phnum * sizeof(Elf32_Phdr), "ph"); 211 if (needswap) 212 bswap32_region((int32_t*)ph, sizeof(Elf32_Phdr) * ex.e_phnum); 213 /* Read the section headers... */ 214 sh = (Elf32_Shdr *) saveRead(infile, ex.e_shoff, 215 ex.e_shnum * sizeof(Elf32_Shdr), "sh"); 216 if (needswap) 217 bswap32_region((int32_t*)sh, sizeof(Elf32_Shdr) * ex.e_shnum); 218 219 /* Read in the section string table. */ 220 shstrtab = saveRead(infile, sh[ex.e_shstrndx].sh_offset, 221 sh[ex.e_shstrndx].sh_size, "shstrtab"); 222 223 224 /* Look for the symbol table and string table... Also map section 225 * indices to symbol types for a.out */ 226 symtabix = 0; 227 strtabix = 0; 228 for (i = 0; i < ex.e_shnum; i++) { 229 char *name = shstrtab + sh[i].sh_name; 230 if (!strcmp(name, ".symtab")) 231 symtabix = i; 232 else 233 if (!strcmp(name, ".strtab")) 234 strtabix = i; 235 236 } 237 238 /* Figure out if we can cram the program header into an ECOFF 239 * header... Basically, we can't handle anything but loadable 240 * segments, but we can ignore some kinds of segments. We can't 241 * handle holes in the address space. Segments may be out of order, 242 * so we sort them first. */ 243 244 qsort(ph, ex.e_phnum, sizeof(Elf32_Phdr), 245 (int (*) (const void *, const void *)) phcmp); 246 247 for (i = 0; i < ex.e_phnum; i++) { 248 /* Section types we can ignore... */ 249 if (ph[i].p_type == PT_NULL || ph[i].p_type == PT_NOTE || 250 ph[i].p_type == PT_PHDR || 251 ph[i].p_type == PT_MIPS_REGINFO) { 252 253 if (debug) { 254 fprintf(stderr, " skipping PH %zu type %d flags 0x%x\n", 255 i, ph[i].p_type, ph[i].p_flags); 256 } 257 continue; 258 } 259 /* Section types we can't handle... */ 260 else 261 if (ph[i].p_type != PT_LOAD) { 262 fprintf(stderr, "Program header %zu type %d can't be converted.\n", 263 i, ph[i].p_type); 264 exit(1); 265 } 266 /* Writable (data) segment? */ 267 if (ph[i].p_flags & PF_W) { 268 struct sect ndata, nbss; 269 270 ndata.vaddr = ph[i].p_vaddr; 271 ndata.len = ph[i].p_filesz; 272 nbss.vaddr = ph[i].p_vaddr + ph[i].p_filesz; 273 nbss.len = ph[i].p_memsz - ph[i].p_filesz; 274 275 if (debug) { 276 fprintf(stderr, 277 " combinining PH %zu type %d flags 0x%x with data, ndata = %ld, nbss =%ld\n", i, ph[i].p_type, ph[i].p_flags, ndata.len, nbss.len); 278 } 279 combine(&data, &ndata, 0); 280 combine(&bss, &nbss, 1); 281 } else { 282 struct sect ntxt; 283 284 ntxt.vaddr = ph[i].p_vaddr; 285 ntxt.len = ph[i].p_filesz; 286 if (debug) { 287 288 fprintf(stderr, 289 " combinining PH %zu type %d flags 0x%x with text, len = %ld\n", 290 i, ph[i].p_type, ph[i].p_flags, ntxt.len); 291 } 292 combine(&text, &ntxt, 0); 293 } 294 /* Remember the lowest segment start address. */ 295 if (ph[i].p_vaddr < cur_vma) 296 cur_vma = ph[i].p_vaddr; 297 } 298 299 /* Sections must be in order to be converted... */ 300 if (text.vaddr > data.vaddr || data.vaddr > bss.vaddr || 301 text.vaddr + text.len > data.vaddr || data.vaddr + data.len > bss.vaddr) { 302 fprintf(stderr, "Sections ordering prevents a.out conversion.\n"); 303 exit(1); 304 } 305 /* If there's a data section but no text section, then the loader 306 * combined everything into one section. That needs to be the text 307 * section, so just make the data section zero length following text. */ 308 if (data.len && text.len == 0) { 309 text = data; 310 data.vaddr = text.vaddr + text.len; 311 data.len = 0; 312 } 313 /* If there is a gap between text and data, we'll fill it when we copy 314 * the data, so update the length of the text segment as represented 315 * in a.out to reflect that, since a.out doesn't allow gaps in the 316 * program address space. */ 317 if (text.vaddr + text.len < data.vaddr) 318 text.len = data.vaddr - text.vaddr; 319 320 /* We now have enough information to cons up an a.out header... */ 321 ep.a.magic = ECOFF_OMAGIC; 322 ep.a.vstamp = 2 * 256 + 10; /* compatible with version 2.10 */ 323 ep.a.tsize = text.len; 324 ep.a.dsize = data.len; 325 ep.a.bsize = bss.len; 326 ep.a.entry = ex.e_entry; 327 ep.a.text_start = text.vaddr; 328 ep.a.data_start = data.vaddr; 329 ep.a.bss_start = bss.vaddr; 330 ep.a.gprmask = 0xf3fffffe; 331 memset(&ep.a.cprmask, 0, sizeof ep.a.cprmask); 332 ep.a.gp_value = 0; /* unused. */ 333 334 if (mipsel) 335 ep.f.f_magic = ECOFF_MAGIC_MIPSEL; 336 else 337 ep.f.f_magic = ECOFF_MAGIC_MIPSEB; 338 339 ep.f.f_nscns = 6; 340 ep.f.f_timdat = 0; /* bogus */ 341 ep.f.f_symptr = 0; 342 ep.f.f_nsyms = sizeof(struct ecoff_symhdr); 343 ep.f.f_opthdr = sizeof ep.a; 344 ep.f.f_flags = 0x100f; /* Stripped, not sharable. */ 345 346 memset(esecs, 0, sizeof(esecs)); 347 348 /* Make ECOFF section headers, with empty stubs for 349 * .rdata/.sdata/.sbss. */ 350 make_ecoff_section_hdrs(&ep, esecs); 351 352 nsecs = ep.f.f_nscns; 353 354 if (needswap) { 355 ep.f.f_magic = bswap16(ep.f.f_magic); 356 ep.f.f_nscns = bswap16(ep.f.f_nscns); 357 ep.f.f_timdat = bswap32(ep.f.f_timdat); 358 ep.f.f_symptr = bswap32(ep.f.f_symptr); 359 ep.f.f_nsyms = bswap32(ep.f.f_nsyms); 360 ep.f.f_opthdr = bswap16(ep.f.f_opthdr); 361 ep.f.f_flags = bswap16(ep.f.f_flags); 362 ep.a.magic = bswap16(ep.a.magic); 363 ep.a.vstamp = bswap16(ep.a.vstamp); 364 ep.a.tsize = bswap32(ep.a.tsize); 365 ep.a.dsize = bswap32(ep.a.dsize); 366 ep.a.bsize = bswap32(ep.a.bsize); 367 ep.a.entry = bswap32(ep.a.entry); 368 ep.a.text_start = bswap32(ep.a.text_start); 369 ep.a.data_start = bswap32(ep.a.data_start); 370 ep.a.bss_start = bswap32(ep.a.bss_start); 371 ep.a.gprmask = bswap32(ep.a.gprmask); 372 bswap32_region((int32_t*)ep.a.cprmask, sizeof(ep.a.cprmask)); 373 ep.a.gp_value = bswap32(ep.a.gp_value); 374 for (i = 0; i < sizeof(esecs) / sizeof(esecs[0]); i++) { 375 esecs[i].s_paddr = bswap32(esecs[i].s_paddr); 376 esecs[i].s_vaddr = bswap32(esecs[i].s_vaddr); 377 esecs[i].s_size = bswap32(esecs[i].s_size); 378 esecs[i].s_scnptr = bswap32(esecs[i].s_scnptr); 379 esecs[i].s_relptr = bswap32(esecs[i].s_relptr); 380 esecs[i].s_lnnoptr = bswap32(esecs[i].s_lnnoptr); 381 esecs[i].s_nreloc = bswap16(esecs[i].s_nreloc); 382 esecs[i].s_nlnno = bswap16(esecs[i].s_nlnno); 383 esecs[i].s_flags = bswap32(esecs[i].s_flags); 384 } 385 } 386 387 /* Make the output file... */ 388 if ((outfile = open(argv[2], O_WRONLY | O_CREAT, 0777)) < 0) { 389 fprintf(stderr, "Unable to create %s: %s\n", argv[2], strerror(errno)); 390 exit(1); 391 } 392 /* Truncate file... */ 393 if (ftruncate(outfile, 0)) { 394 warn("ftruncate %s", argv[2]); 395 } 396 /* Write the headers... */ 397 safewrite(outfile, &ep.f, sizeof(ep.f), "ep.f: write: %s\n"); 398 if (debug) 399 fprintf(stderr, "wrote %zu byte file header.\n", sizeof(ep.f)); 400 401 safewrite(outfile, &ep.a, sizeof(ep.a), "ep.a: write: %s\n"); 402 if (debug) 403 fprintf(stderr, "wrote %zu byte a.out header.\n", sizeof(ep.a)); 404 405 safewrite(outfile, &esecs, sizeof(esecs[0]) * nsecs, 406 "esecs: write: %s\n"); 407 if (debug) 408 fprintf(stderr, "wrote %zu bytes of section headers.\n", 409 sizeof(esecs[0]) * nsecs); 410 411 412 pad = ((sizeof ep.f + sizeof ep.a + sizeof esecs) & 15); 413 if (pad) { 414 pad = 16 - pad; 415 pad16(outfile, pad, "ipad: write: %s\n"); 416 if (debug) 417 fprintf(stderr, "wrote %d byte pad.\n", pad); 418 } 419 /* Copy the loadable sections. Zero-fill any gaps less than 64k; 420 * complain about any zero-filling, and die if we're asked to 421 * zero-fill more than 64k. */ 422 for (i = 0; i < ex.e_phnum; i++) { 423 /* Unprocessable sections were handled above, so just verify 424 * that the section can be loaded before copying. */ 425 if (ph[i].p_type == PT_LOAD && ph[i].p_filesz) { 426 if (cur_vma != ph[i].p_vaddr) { 427 unsigned long gap = ph[i].p_vaddr - cur_vma; 428 char obuf[1024]; 429 if (gap > 65536) { 430 fprintf(stderr, "Intersegment gap (%ld bytes) too large.\n", 431 gap); 432 exit(1); 433 } 434 if (debug) 435 fprintf(stderr, "Warning: %ld byte intersegment gap.\n", gap); 436 memset(obuf, 0, sizeof obuf); 437 while (gap) { 438 int count = write(outfile, obuf, (gap > sizeof obuf 439 ? sizeof obuf : gap)); 440 if (count < 0) { 441 fprintf(stderr, "Error writing gap: %s\n", 442 strerror(errno)); 443 exit(1); 444 } 445 gap -= count; 446 } 447 } 448 if (debug) 449 fprintf(stderr, "writing %d bytes...\n", ph[i].p_filesz); 450 copy(outfile, infile, ph[i].p_offset, ph[i].p_filesz); 451 cur_vma = ph[i].p_vaddr + ph[i].p_filesz; 452 } 453 } 454 455 456 if (debug) 457 fprintf(stderr, "writing syms at offset 0x%lx\n", 458 (u_long) ep.f.f_symptr + sizeof(symhdr)); 459 460 /* Copy and translate the symbol table... */ 461 elf_symbol_table_to_ecoff(outfile, infile, &ep, 462 sh[symtabix].sh_offset, sh[symtabix].sh_size, 463 sh[strtabix].sh_offset, sh[strtabix].sh_size); 464 465 /* 466 * Write a page of padding for boot PROMS that read entire pages. 467 * Without this, they may attempt to read past the end of the 468 * data section, incur an error, and refuse to boot. 469 */ 470 { 471 char obuf[4096]; 472 memset(obuf, 0, sizeof obuf); 473 if (write(outfile, obuf, sizeof(obuf)) != sizeof(obuf)) { 474 fprintf(stderr, "Error writing PROM padding: %s\n", 475 strerror(errno)); 476 exit(1); 477 } 478 } 479 480 /* Looks like we won... */ 481 exit(0); 482} 483 484void 485copy(int out, int in, off_t offset, off_t size) 486{ 487 char ibuf[4096]; 488 size_t remaining, cur, count; 489 490 /* Go to the start of the ELF symbol table... */ 491 if (lseek(in, offset, SEEK_SET) < 0) { 492 perror("copy: lseek"); 493 exit(1); 494 } 495 remaining = size; 496 while (remaining) { 497 cur = remaining; 498 if (cur > sizeof ibuf) 499 cur = sizeof ibuf; 500 remaining -= cur; 501 if ((count = read(in, ibuf, cur)) != cur) { 502 fprintf(stderr, "copy: read: %s\n", 503 count ? strerror(errno) : "premature end of file"); 504 exit(1); 505 } 506 safewrite(out, ibuf, cur, "copy: write: %s\n"); 507 } 508} 509/* Combine two segments, which must be contiguous. If pad is true, it's 510 okay for there to be padding between. */ 511void 512combine(struct sect *base, struct sect *new, int pad) 513{ 514 515 if (base->len == 0) 516 *base = *new; 517 else 518 if (new->len) { 519 if (base->vaddr + base->len != new->vaddr) { 520 if (pad) 521 base->len = new->vaddr - base->vaddr; 522 else { 523 fprintf(stderr, 524 "Non-contiguous data can't be converted.\n"); 525 exit(1); 526 } 527 } 528 base->len += new->len; 529 } 530} 531 532int 533phcmp(Elf32_Phdr *h1, Elf32_Phdr *h2) 534{ 535 536 if (h1->p_vaddr > h2->p_vaddr) 537 return 1; 538 else 539 if (h1->p_vaddr < h2->p_vaddr) 540 return -1; 541 else 542 return 0; 543} 544 545char * 546saveRead(int file, off_t offset, off_t len, const char *name) 547{ 548 char *tmp; 549 int count; 550 off_t off; 551 552 if ((off = lseek(file, offset, SEEK_SET)) < 0) { 553 fprintf(stderr, "%s: fseek: %s\n", name, strerror(errno)); 554 exit(1); 555 } 556 if ((tmp = malloc(len)) == NULL) { 557 fprintf(stderr, "%s: Can't allocate %ld bytes.\n", name, (long) len); 558 exit(1); 559 } 560 count = read(file, tmp, len); 561 if (count != len) { 562 fprintf(stderr, "%s: read: %s.\n", 563 name, count ? strerror(errno) : "End of file reached"); 564 exit(1); 565 } 566 return tmp; 567} 568 569void 570safewrite(int outfile, const void *buf, off_t len, const char *msg) 571{ 572 int written; 573 574 written = write(outfile, buf, len); 575 if (written != len) { 576 fprintf(stderr, msg, strerror(errno)); 577 exit(1); 578 } 579} 580 581 582/* 583 * Output only three ECOFF sections, corresponding to ELF psecs 584 * for text, data, and bss. 585 */ 586int 587make_ecoff_section_hdrs(struct ecoff_exechdr *ep, struct ecoff_scnhdr *esecs) 588{ 589 590 ep->f.f_nscns = 6; /* XXX */ 591 592 strcpy(esecs[0].s_name, ".text"); 593 strcpy(esecs[1].s_name, ".data"); 594 strcpy(esecs[2].s_name, ".bss"); 595 596 esecs[0].s_paddr = esecs[0].s_vaddr = ep->a.text_start; 597 esecs[1].s_paddr = esecs[1].s_vaddr = ep->a.data_start; 598 esecs[2].s_paddr = esecs[2].s_vaddr = ep->a.bss_start; 599 esecs[0].s_size = ep->a.tsize; 600 esecs[1].s_size = ep->a.dsize; 601 esecs[2].s_size = ep->a.bsize; 602 603 esecs[0].s_scnptr = ECOFF_TXTOFF(ep); 604 esecs[1].s_scnptr = ECOFF_DATOFF(ep); 605#if 0 606 esecs[2].s_scnptr = esecs[1].s_scnptr + 607 ECOFF_ROUND(esecs[1].s_size, ECOFF_SEGMENT_ALIGNMENT(ep)); 608#endif 609 610 esecs[0].s_relptr = esecs[1].s_relptr = esecs[2].s_relptr = 0; 611 esecs[0].s_lnnoptr = esecs[1].s_lnnoptr = esecs[2].s_lnnoptr = 0; 612 esecs[0].s_nreloc = esecs[1].s_nreloc = esecs[2].s_nreloc = 0; 613 esecs[0].s_nlnno = esecs[1].s_nlnno = esecs[2].s_nlnno = 0; 614 615 esecs[1].s_flags = 0x100; /* ECOFF rdata */ 616 esecs[3].s_flags = 0x200; /* ECOFF sdata */ 617 esecs[4].s_flags = 0x400; /* ECOFF sbss */ 618 619 /* 620 * Set the symbol-table offset to point at the end of any 621 * sections we loaded above, so later code can use it to write 622 * symbol table info.. 623 */ 624 ep->f.f_symptr = esecs[1].s_scnptr + esecs[1].s_size; 625 return (ep->f.f_nscns); 626} 627 628 629/* 630 * Write the ECOFF symbol header. 631 * Guess at how big the symbol table will be. 632 * Mark all symbols as EXTERN (for now). 633 */ 634void 635write_ecoff_symhdr(int out, struct ecoff_exechdr *ep, 636 struct ecoff_symhdr *symhdrp, long nesyms, 637 long extsymoff, long extstroff, long strsize) 638{ 639 640 if (debug) 641 fprintf(stderr, "writing symhdr for %ld entries at offset 0x%lx\n", 642 nesyms, (u_long) ep->f.f_symptr); 643 644 ep->f.f_nsyms = sizeof(struct ecoff_symhdr); 645 646 memset(symhdrp, 0, sizeof(*symhdrp)); 647 symhdrp->esymMax = nesyms; 648 symhdrp->magic = 0x7009;/* XXX */ 649 symhdrp->cbExtOffset = extsymoff; 650 symhdrp->cbSsExtOffset = extstroff; 651 652 symhdrp->issExtMax = strsize; 653 if (debug) 654 fprintf(stderr, 655 "ECOFF symhdr: symhdr %zx, strsize %lx, symsize %lx\n", 656 sizeof(*symhdrp), strsize, 657 (nesyms * sizeof(struct ecoff_extsym))); 658 659 if (needswap) { 660 bswap32_region(&symhdrp->ilineMax, 661 sizeof(*symhdrp) - sizeof(symhdrp->magic) - 662 sizeof(symhdrp->ilineMax)); 663 symhdrp->magic = bswap16(symhdrp->magic); 664 symhdrp->ilineMax = bswap16(symhdrp->ilineMax); 665 } 666 667 safewrite(out, symhdrp, sizeof(*symhdrp), 668 "writing symbol header: %s\n"); 669} 670 671 672void 673elf_read_syms(struct elf_syms *elfsymsp, int in, off_t symoff, off_t symsize, 674 off_t stroff, off_t strsize) 675{ 676 register int nsyms; 677 int i; 678 nsyms = symsize / sizeof(Elf32_Sym); 679 680 /* Suck in the ELF symbol list... */ 681 elfsymsp->elf_syms = (Elf32_Sym *) 682 saveRead(in, symoff, nsyms * sizeof(Elf32_Sym), 683 "ELF symboltable"); 684 elfsymsp->nsymbols = nsyms; 685 if (needswap) { 686 for (i = 0; i < nsyms; i++) { 687 Elf32_Sym *s = &elfsymsp->elf_syms[i]; 688 s->st_name = bswap32(s->st_name); 689 s->st_value = bswap32(s->st_value); 690 s->st_size = bswap32(s->st_size); 691 s->st_shndx = bswap16(s->st_shndx); 692 } 693 } 694 695 /* Suck in the ELF string table... */ 696 elfsymsp->stringtab = (char *) 697 saveRead(in, stroff, strsize, "ELF string table"); 698 elfsymsp->stringsize = strsize; 699} 700 701 702/* 703 * 704 */ 705void 706elf_symbol_table_to_ecoff(int out, int in, struct ecoff_exechdr *ep, 707 off_t symoff, off_t symsize, off_t stroff, off_t strsize) 708{ 709 710 struct elf_syms elfsymtab; 711 struct ecoff_syms ecoffsymtab; 712 register u_long ecoff_symhdr_off, symtaboff, stringtaboff; 713 register u_long nextoff, symtabsize, ecoff_strsize; 714 int nsyms, i; 715 struct ecoff_symhdr symhdr; 716 int padding; 717 718 /* Read in the ELF symbols. */ 719 elf_read_syms(&elfsymtab, in, symoff, symsize, stroff, strsize); 720 721 /* Approximate translation to ECOFF. */ 722 translate_syms(&elfsymtab, &ecoffsymtab); 723 nsyms = ecoffsymtab.nsymbols; 724 725 /* Compute output ECOFF symbol- and string-table offsets. */ 726 ecoff_symhdr_off = ep->f.f_symptr; 727 728 nextoff = ecoff_symhdr_off + sizeof(struct ecoff_symhdr); 729 stringtaboff = nextoff; 730 ecoff_strsize = ECOFF_ROUND(ecoffsymtab.stringsize, 731 (ECOFF_SEGMENT_ALIGNMENT(ep))); 732 733 734 nextoff = stringtaboff + ecoff_strsize; 735 symtaboff = nextoff; 736 symtabsize = nsyms * sizeof(struct ecoff_extsym); 737 symtabsize = ECOFF_ROUND(symtabsize, ECOFF_SEGMENT_ALIGNMENT(ep)); 738 739 /* Write out the symbol header ... */ 740 write_ecoff_symhdr(out, ep, &symhdr, nsyms, symtaboff, 741 stringtaboff, ecoffsymtab.stringsize); 742 743 /* Write out the string table... */ 744 padding = ecoff_strsize - ecoffsymtab.stringsize; 745 safewrite(out, ecoffsymtab.stringtab, ecoffsymtab.stringsize, 746 "string table: write: %s\n"); 747 if (padding) 748 pad16(out, padding, "string table: padding: %s\n"); 749 750 751 /* Write out the symbol table... */ 752 padding = symtabsize - (nsyms * sizeof(struct ecoff_extsym)); 753 754 for (i = 0; i < nsyms; i++) { 755 struct ecoff_extsym *es = &ecoffsymtab.ecoff_syms[i]; 756 es->es_flags = bswap16(es->es_flags); 757 es->es_ifd = bswap16(es->es_ifd); 758 bswap32_region(&es->es_strindex, 759 sizeof(*es) - sizeof(es->es_flags) - sizeof(es->es_ifd)); 760 } 761 safewrite(out, ecoffsymtab.ecoff_syms, 762 nsyms * sizeof(struct ecoff_extsym), 763 "symbol table: write: %s\n"); 764 if (padding) 765 pad16(out, padding, "symbols: padding: %s\n"); 766} 767 768 769 770/* 771 * In-memory translation of ELF symbosl to ECOFF. 772 */ 773void 774translate_syms(struct elf_syms *elfp, struct ecoff_syms *ecoffp) 775{ 776 777 int i; 778 char *oldstringbase; 779 char *newstrings, *nsp; 780 781 int nsyms, idx; 782 783 nsyms = elfp->nsymbols; 784 oldstringbase = elfp->stringtab; 785 786 /* Allocate space for corresponding ECOFF symbols. */ 787 memset(ecoffp, 0, sizeof(*ecoffp)); 788 789 ecoffp->nsymbols = 0; 790 ecoffp->ecoff_syms = malloc(sizeof(struct ecoff_extsym) * nsyms); 791 792 /* we are going to be no bigger than the ELF symbol table. */ 793 ecoffp->stringsize = elfp->stringsize; 794 ecoffp->stringtab = malloc(elfp->stringsize); 795 796 newstrings = (char *) ecoffp->stringtab; 797 nsp = (char *) ecoffp->stringtab; 798 if (newstrings == NULL) { 799 fprintf(stderr, "No memory for new string table!\n"); 800 exit(1); 801 } 802 /* Copy and translate symbols... */ 803 idx = 0; 804 for (i = 0; i < nsyms; i++) { 805 int binding, type; 806 807 binding = ELF32_ST_BIND((elfp->elf_syms[i].st_info)); 808 type = ELF32_ST_TYPE((elfp->elf_syms[i].st_info)); 809 810 /* skip strange symbols */ 811 if (binding == 0) { 812 continue; 813 } 814 /* Copy the symbol into the new table */ 815 strcpy(nsp, oldstringbase + elfp->elf_syms[i].st_name); 816 ecoffp->ecoff_syms[idx].es_strindex = nsp - newstrings; 817 nsp += strlen(nsp) + 1; 818 819 /* translate symbol types to ECOFF XXX */ 820 ecoffp->ecoff_syms[idx].es_type = 1; 821 ecoffp->ecoff_syms[idx].es_class = 5; 822 823 /* Symbol values in executables should be compatible. */ 824 ecoffp->ecoff_syms[idx].es_value = elfp->elf_syms[i].st_value; 825 ecoffp->ecoff_syms[idx].es_symauxindex = 0xfffff; 826 827 idx++; 828 } 829 830 ecoffp->nsymbols = idx; 831 ecoffp->stringsize = nsp - newstrings; 832} 833/* 834 * pad to a 16-byte boundary 835 */ 836void 837pad16(int fd, int size, const char *msg) 838{ 839 840 safewrite(fd, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0", size, msg); 841} 842 843/* swap a 32bit region */ 844void 845bswap32_region(int32_t* p, int len) 846{ 847 size_t i; 848 849 for (i = 0; i < len / sizeof(int32_t); i++, p++) 850 *p = bswap32(*p); 851} 852