elf2ecoff.c revision 1.18
1/* $NetBSD: elf2ecoff.c,v 1.18 2002/03/23 17:44:52 bouyer 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#include <sys/types.h> 41#include <err.h> 42#include <errno.h> 43#include <fcntl.h> 44#include <unistd.h> 45#include <sys/exec_elf.h> 46#include <stdio.h> 47#include <sys/exec_ecoff.h> 48#include <stdlib.h> 49#include <string.h> 50#include <limits.h> 51 52 53#define ISLAST(p) (p->n_un.n_name == 0 || p->n_un.n_name[0] == 0) 54 55struct sect { 56 unsigned long vaddr; 57 unsigned long len; 58}; 59 60struct elf_syms { 61 int nsymbols; 62 Elf32_Sym *elf_syms; 63 off_t stringsize; 64 char *stringtab; 65}; 66 67struct ecoff_syms { 68 int nsymbols; 69 struct ecoff_extsym *ecoff_syms; 70 off_t stringsize; 71 char *stringtab; 72}; 73 74int debug = 0; 75 76int phcmp(Elf32_Phdr * h1, Elf32_Phdr * h2); 77 78 79char *saveRead(int file, off_t offset, off_t len, char *name); 80void safewrite(int outfile, void *buf, off_t len, const char *msg); 81void copy(int, int, off_t, off_t); 82void combine(struct sect * base, struct sect * new, int paddable); 83void translate_syms(struct elf_syms *, struct ecoff_syms *); 84void 85elf_symbol_table_to_ecoff(int out, int in, 86 struct ecoff_exechdr * ep, 87 off_t symoff, off_t symsize, 88 off_t stroff, off_t strsize); 89 90 91int 92make_ecoff_section_hdrs(struct ecoff_exechdr * ep, 93 struct ecoff_scnhdr * esecs); 94 95void 96write_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(u_int32_t* , int); 103 104int *symTypeTable; 105int needswap; 106 107 108 109 110void 111elf_read_syms(struct elf_syms * elfsymsp, int infile, 112 off_t symoff, off_t symsize, off_t stroff, off_t strsize); 113 114 115int 116main(int argc, char **argv, char **envp) 117{ 118 Elf32_Ehdr ex; 119 Elf32_Phdr *ph; 120 Elf32_Shdr *sh; 121 char *shstrtab; 122 int strtabix, symtabix; 123 int i, 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((u_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((u_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 %d 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 %d 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 %d 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 %d 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) { 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((u_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 %d 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 %d 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 %d 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(out, in, offset, size) 486 int out, in; 487 off_t offset, size; 488{ 489 char ibuf[4096]; 490 int remaining, cur, count; 491 492 /* Go to the start of the ELF symbol table... */ 493 if (lseek(in, offset, SEEK_SET) < 0) { 494 perror("copy: lseek"); 495 exit(1); 496 } 497 remaining = size; 498 while (remaining) { 499 cur = remaining; 500 if (cur > sizeof ibuf) 501 cur = sizeof ibuf; 502 remaining -= cur; 503 if ((count = read(in, ibuf, cur)) != cur) { 504 fprintf(stderr, "copy: read: %s\n", 505 count ? strerror(errno) : "premature end of file"); 506 exit(1); 507 } 508 safewrite(out, ibuf, cur, "copy: write: %s\n"); 509 } 510} 511/* Combine two segments, which must be contiguous. If pad is true, it's 512 okay for there to be padding between. */ 513void 514combine(base, new, pad) 515 struct sect *base, *new; 516 int pad; 517{ 518 if (!base->len) 519 *base = *new; 520 else 521 if (new->len) { 522 if (base->vaddr + base->len != new->vaddr) { 523 if (pad) 524 base->len = new->vaddr - base->vaddr; 525 else { 526 fprintf(stderr, 527 "Non-contiguous data can't be converted.\n"); 528 exit(1); 529 } 530 } 531 base->len += new->len; 532 } 533} 534 535int 536phcmp(h1, h2) 537 Elf32_Phdr *h1, *h2; 538{ 539 if (h1->p_vaddr > h2->p_vaddr) 540 return 1; 541 else 542 if (h1->p_vaddr < h2->p_vaddr) 543 return -1; 544 else 545 return 0; 546} 547 548char 549 * 550saveRead(int file, off_t offset, off_t len, char *name) 551{ 552 char *tmp; 553 int count; 554 off_t off; 555 if ((off = lseek(file, offset, SEEK_SET)) < 0) { 556 fprintf(stderr, "%s: fseek: %s\n", name, strerror(errno)); 557 exit(1); 558 } 559 if (!(tmp = (char *) malloc(len))) { 560 fprintf(stderr, "%s: Can't allocate %ld bytes.\n", name, (long) len); 561 exit(1); 562 } 563 count = read(file, tmp, len); 564 if (count != len) { 565 fprintf(stderr, "%s: read: %s.\n", 566 name, count ? strerror(errno) : "End of file reached"); 567 exit(1); 568 } 569 return tmp; 570} 571 572void 573safewrite(int outfile, void *buf, off_t len, const char *msg) 574{ 575 int written; 576 written = write(outfile, (char *) buf, len); 577 if (written != len) { 578 fprintf(stderr, msg, strerror(errno)); 579 exit(1); 580 } 581} 582 583 584/* 585 * Output only three ECOFF sections, corresponding to ELF psecs 586 * for text, data, and bss. 587 */ 588int 589make_ecoff_section_hdrs(ep, esecs) 590 struct ecoff_exechdr *ep; 591 struct ecoff_scnhdr *esecs; 592 593{ 594 ep->f.f_nscns = 6; /* XXX */ 595 596 strcpy(esecs[0].s_name, ".text"); 597 strcpy(esecs[1].s_name, ".data"); 598 strcpy(esecs[2].s_name, ".bss"); 599 600 esecs[0].s_paddr = esecs[0].s_vaddr = ep->a.text_start; 601 esecs[1].s_paddr = esecs[1].s_vaddr = ep->a.data_start; 602 esecs[2].s_paddr = esecs[2].s_vaddr = ep->a.bss_start; 603 esecs[0].s_size = ep->a.tsize; 604 esecs[1].s_size = ep->a.dsize; 605 esecs[2].s_size = ep->a.bsize; 606 607 esecs[0].s_scnptr = ECOFF_TXTOFF(ep); 608 esecs[1].s_scnptr = ECOFF_DATOFF(ep); 609#if 0 610 esecs[2].s_scnptr = esecs[1].s_scnptr + 611 ECOFF_ROUND(esecs[1].s_size, ECOFF_SEGMENT_ALIGNMENT(ep)); 612#endif 613 614 esecs[0].s_relptr = esecs[1].s_relptr = esecs[2].s_relptr = 0; 615 esecs[0].s_lnnoptr = esecs[1].s_lnnoptr = esecs[2].s_lnnoptr = 0; 616 esecs[0].s_nreloc = esecs[1].s_nreloc = esecs[2].s_nreloc = 0; 617 esecs[0].s_nlnno = esecs[1].s_nlnno = esecs[2].s_nlnno = 0; 618 619 esecs[1].s_flags = 0x100; /* ECOFF rdata */ 620 esecs[3].s_flags = 0x200; /* ECOFF sdata */ 621 esecs[4].s_flags = 0x400; /* ECOFF sbss */ 622 623 /* 624 * Set the symbol-table offset to point at the end of any 625 * sections we loaded above, so later code can use it to write 626 * symbol table info.. 627 */ 628 ep->f.f_symptr = esecs[1].s_scnptr + esecs[1].s_size; 629 return (ep->f.f_nscns); 630} 631 632 633/* 634 * Write the ECOFF symbol header. 635 * Guess at how big the symbol table will be. 636 * Mark all symbols as EXTERN (for now). 637 */ 638void 639write_ecoff_symhdr(out, ep, symhdrp, nesyms, extsymoff, extstroff, strsize) 640 int out; 641 struct ecoff_exechdr *ep; 642 struct ecoff_symhdr *symhdrp; 643 long nesyms, extsymoff, extstroff, strsize; 644{ 645 if (debug) 646 fprintf(stderr, "writing symhdr for %ld entries at offset 0x%lx\n", 647 nesyms, (u_long) ep->f.f_symptr); 648 649 ep->f.f_nsyms = sizeof(struct ecoff_symhdr); 650 651 memset(symhdrp, 0, sizeof(*symhdrp)); 652 symhdrp->esymMax = nesyms; 653 symhdrp->magic = 0x7009;/* XXX */ 654 symhdrp->cbExtOffset = extsymoff; 655 symhdrp->cbSsExtOffset = extstroff; 656 657 symhdrp->issExtMax = strsize; 658 if (debug) 659 fprintf(stderr, 660 "ECOFF symhdr: symhdr %x, strsize %lx, symsize %lx\n", 661 sizeof(*symhdrp), strsize, 662 (nesyms * sizeof(struct ecoff_extsym))); 663 664 if (needswap) { 665 bswap32_region((u_int32_t*)&symhdrp->ilineMax, 666 sizeof(*symhdrp) - sizeof(symhdrp->magic) - 667 sizeof(symhdrp->ilineMax)); 668 symhdrp->magic = bswap16(symhdrp->magic); 669 symhdrp->ilineMax = bswap16(symhdrp->ilineMax); 670 } 671 672 safewrite(out, symhdrp, sizeof(*symhdrp), 673 "writing symbol header: %s\n"); 674} 675 676 677void 678elf_read_syms(elfsymsp, in, symoff, symsize, stroff, strsize) 679 struct elf_syms *elfsymsp; 680 int in; 681 off_t symoff, symsize; 682 off_t stroff, strsize; 683{ 684 register int nsyms; 685 int i; 686 nsyms = symsize / sizeof(Elf32_Sym); 687 688 /* Suck in the ELF symbol list... */ 689 elfsymsp->elf_syms = (Elf32_Sym *) 690 saveRead(in, symoff, nsyms * sizeof(Elf32_Sym), 691 "ELF symboltable"); 692 elfsymsp->nsymbols = nsyms; 693 if (needswap) { 694 for (i = 0; i < nsyms; i++) { 695 Elf32_Sym *s = &elfsymsp->elf_syms[i]; 696 s->st_name = bswap32(s->st_name); 697 s->st_value = bswap32(s->st_value); 698 s->st_size = bswap32(s->st_size); 699 s->st_shndx = bswap16(s->st_shndx); 700 } 701 } 702 703 /* Suck in the ELF string table... */ 704 elfsymsp->stringtab = (char *) 705 saveRead(in, stroff, strsize, "ELF string table"); 706 elfsymsp->stringsize = strsize; 707} 708 709 710/* 711 * 712 */ 713void 714elf_symbol_table_to_ecoff(out, in, ep, symoff, symsize, stroff, strsize) 715 int out, in; 716 struct ecoff_exechdr *ep; 717 off_t symoff, symsize; 718 off_t stroff, strsize; 719{ 720 721 struct elf_syms elfsymtab; 722 struct ecoff_syms ecoffsymtab; 723 register u_long ecoff_symhdr_off, symtaboff, stringtaboff; 724 register u_long nextoff, symtabsize, ecoff_strsize; 725 int nsyms, i; 726 struct ecoff_symhdr symhdr; 727 int padding; 728 729 /* Read in the ELF symbols. */ 730 elf_read_syms(&elfsymtab, in, symoff, symsize, stroff, strsize); 731 732 /* Approximate translation to ECOFF. */ 733 translate_syms(&elfsymtab, &ecoffsymtab); 734 nsyms = ecoffsymtab.nsymbols; 735 736 /* Compute output ECOFF symbol- and string-table offsets. */ 737 ecoff_symhdr_off = ep->f.f_symptr; 738 739 nextoff = ecoff_symhdr_off + sizeof(struct ecoff_symhdr); 740 stringtaboff = nextoff; 741 ecoff_strsize = ECOFF_ROUND(ecoffsymtab.stringsize, 742 (ECOFF_SEGMENT_ALIGNMENT(ep))); 743 744 745 nextoff = stringtaboff + ecoff_strsize; 746 symtaboff = nextoff; 747 symtabsize = nsyms * sizeof(struct ecoff_extsym); 748 symtabsize = ECOFF_ROUND(symtabsize, ECOFF_SEGMENT_ALIGNMENT(ep)); 749 750 /* Write out the symbol header ... */ 751 write_ecoff_symhdr(out, ep, &symhdr, nsyms, symtaboff, 752 stringtaboff, ecoffsymtab.stringsize); 753 754 /* Write out the string table... */ 755 padding = ecoff_strsize - ecoffsymtab.stringsize; 756 safewrite(out, ecoffsymtab.stringtab, ecoffsymtab.stringsize, 757 "string table: write: %s\n"); 758 if (padding) 759 pad16(out, padding, "string table: padding: %s\n"); 760 761 762 /* Write out the symbol table... */ 763 padding = symtabsize - (nsyms * sizeof(struct ecoff_extsym)); 764 765 for (i = 0; i < nsyms; i++) { 766 struct ecoff_extsym *es = &ecoffsymtab.ecoff_syms[i]; 767 es->es_flags = bswap16(es->es_flags); 768 es->es_ifd = bswap16(es->es_ifd); 769 bswap32_region(&es->es_strindex, 770 sizeof(*es) - sizeof(es->es_flags) - sizeof(es->es_ifd)); 771 } 772 safewrite(out, ecoffsymtab.ecoff_syms, 773 nsyms * sizeof(struct ecoff_extsym), 774 "symbol table: write: %s\n"); 775 if (padding) 776 pad16(out, padding, "symbols: padding: %s\n"); 777} 778 779 780 781/* 782 * In-memory translation of ELF symbosl to ECOFF. 783 */ 784void 785translate_syms(elfp, ecoffp) 786 struct elf_syms *elfp; 787 struct ecoff_syms *ecoffp; 788{ 789 790 int i; 791 char *oldstringbase; 792 char *newstrings, *nsp; 793 794 int nsyms, idx; 795 796 nsyms = elfp->nsymbols; 797 oldstringbase = elfp->stringtab; 798 799 /* Allocate space for corresponding ECOFF symbols. */ 800 memset(ecoffp, 0, sizeof(*ecoffp)); 801 802 ecoffp->nsymbols = 0; 803 ecoffp->ecoff_syms = malloc(sizeof(struct ecoff_extsym) * nsyms); 804 805 /* we are going to be no bigger than the ELF symbol table. */ 806 ecoffp->stringsize = elfp->stringsize; 807 ecoffp->stringtab = malloc(elfp->stringsize); 808 809 newstrings = (char *) ecoffp->stringtab; 810 nsp = (char *) ecoffp->stringtab; 811 if (!newstrings) { 812 fprintf(stderr, "No memory for new string table!\n"); 813 exit(1); 814 } 815 /* Copy and translate symbols... */ 816 idx = 0; 817 for (i = 0; i < nsyms; i++) { 818 int binding, type; 819 820 binding = ELF32_ST_BIND((elfp->elf_syms[i].st_info)); 821 type = ELF32_ST_TYPE((elfp->elf_syms[i].st_info)); 822 823 /* skip strange symbols */ 824 if (binding == 0) { 825 continue; 826 } 827 /* Copy the symbol into the new table */ 828 strcpy(nsp, oldstringbase + elfp->elf_syms[i].st_name); 829 ecoffp->ecoff_syms[idx].es_strindex = nsp - newstrings; 830 nsp += strlen(nsp) + 1; 831 832 /* translate symbol types to ECOFF XXX */ 833 ecoffp->ecoff_syms[idx].es_type = 1; 834 ecoffp->ecoff_syms[idx].es_class = 5; 835 836 /* Symbol values in executables should be compatible. */ 837 ecoffp->ecoff_syms[idx].es_value = elfp->elf_syms[i].st_value; 838 ecoffp->ecoff_syms[idx].es_symauxindex = 0xfffff; 839 840 idx++; 841 } 842 843 ecoffp->nsymbols = idx; 844 ecoffp->stringsize = nsp - newstrings; 845} 846/* 847 * pad to a 16-byte boundary 848 */ 849void 850pad16(int fd, int size, const char *msg) 851{ 852 safewrite(fd, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0", size, msg); 853} 854 855/* swap a 32bit region */ 856void 857bswap32_region(u_int32_t* p, int len) 858{ 859 int i; 860 861 for (i = 0; i < len / sizeof(u_int32_t); i++, p++) 862 *p = bswap32(*p); 863} 864