1/* 2 * Copyright (c) 1998 Robert Nordier 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 19 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 23 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#ifndef lint 28static const char rcsid[] = 29 "$FreeBSD: releng/11.0/usr.sbin/btxld/btxld.c 298216 2016-04-18 17:30:33Z pfg $"; 30#endif /* not lint */ 31 32#include <sys/param.h> 33#include <sys/endian.h> 34#include <sys/stat.h> 35#include <sys/mman.h> 36 37/* XXX make this work as an i386/amd64 cross-tool */ 38#include <machine/exec.h> 39#undef __LDPGSZ 40#define __LDPGSZ 4096 41 42#include <netinet/in.h> 43 44#include <a.out.h> 45#include <err.h> 46#include <errno.h> 47#include <fcntl.h> 48#include <stdarg.h> 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52#include <unistd.h> 53 54#include "btx.h" 55#include "elfh.h" 56 57#define BTX_PATH "/sys/boot/i386/btx" 58 59#define I_LDR 0 /* BTX loader */ 60#define I_BTX 1 /* BTX kernel */ 61#define I_CLNT 2 /* Client program */ 62 63#define F_BIN 0 /* Binary */ 64#define F_AOUT 1 /* ZMAGIC a.out */ 65#define F_ELF 2 /* 32-bit ELF */ 66#define F_CNT 3 /* Number of formats */ 67 68#define IMPURE 1 /* Writable text */ 69#define MAXU32 0xffffffff /* Maximum unsigned 32-bit quantity */ 70 71struct hdr { 72 uint32_t fmt; /* Format */ 73 uint32_t flags; /* Bit flags */ 74 uint32_t size; /* Size of file */ 75 uint32_t text; /* Size of text segment */ 76 uint32_t data; /* Size of data segment */ 77 uint32_t bss; /* Size of bss segment */ 78 uint32_t org; /* Program origin */ 79 uint32_t entry; /* Program entry point */ 80}; 81 82static const char *const fmtlist[] = {"bin", "aout", "elf"}; 83 84static const char binfo[] = 85 "kernel: ver=%u.%02u size=%x load=%x entry=%x map=%uM " 86 "pgctl=%x:%x\n"; 87static const char cinfo[] = 88 "client: fmt=%s size=%x text=%x data=%x bss=%x entry=%x\n"; 89static const char oinfo[] = 90 "output: fmt=%s size=%x text=%x data=%x org=%x entry=%x\n"; 91 92static const char *lname = 93 BTX_PATH "/btxldr/btxldr"; /* BTX loader */ 94static const char *bname = 95 BTX_PATH "/btx/btx"; /* BTX kernel */ 96static const char *oname = 97 "a.out"; /* Output filename */ 98 99static int ppage = -1; /* First page present */ 100static int wpage = -1; /* First page writable */ 101 102static unsigned int format; /* Output format */ 103 104static uint32_t centry; /* Client entry address */ 105static uint32_t lentry; /* Loader entry address */ 106 107static int Eflag; /* Client entry option */ 108 109static int quiet; /* Inhibit warnings */ 110static int verbose; /* Display information */ 111 112static const char *tname; /* Temporary output file */ 113static const char *fname; /* Current input file */ 114 115static void cleanup(void); 116static void btxld(const char *); 117static void getbtx(int, struct btx_hdr *); 118static void gethdr(int, struct hdr *); 119static void puthdr(int, struct hdr *); 120static void copy(int, int, size_t, off_t); 121static size_t readx(int, void *, size_t, off_t); 122static void writex(int, const void *, size_t); 123static void seekx(int, off_t); 124static unsigned int optfmt(const char *); 125static uint32_t optaddr(const char *); 126static int optpage(const char *, int); 127static void Warn(const char *, const char *, ...); 128static void usage(void); 129 130/* 131 * A link editor for BTX clients. 132 */ 133int 134main(int argc, char *argv[]) 135{ 136 int c; 137 138 while ((c = getopt(argc, argv, "qvb:E:e:f:l:o:P:W:")) != -1) 139 switch (c) { 140 case 'q': 141 quiet = 1; 142 break; 143 case 'v': 144 verbose = 1; 145 break; 146 case 'b': 147 bname = optarg; 148 break; 149 case 'E': 150 centry = optaddr(optarg); 151 Eflag = 1; 152 break; 153 case 'e': 154 lentry = optaddr(optarg); 155 break; 156 case 'f': 157 format = optfmt(optarg); 158 break; 159 case 'l': 160 lname = optarg; 161 break; 162 case 'o': 163 oname = optarg; 164 break; 165 case 'P': 166 ppage = optpage(optarg, 1); 167 break; 168 case 'W': 169 wpage = optpage(optarg, BTX_MAXCWR); 170 break; 171 default: 172 usage(); 173 } 174 argc -= optind; 175 argv += optind; 176 if (argc != 1) 177 usage(); 178 atexit(cleanup); 179 btxld(*argv); 180 return 0; 181} 182 183/* 184 * Clean up after errors. 185 */ 186static void 187cleanup(void) 188{ 189 if (tname) 190 remove(tname); 191} 192 193/* 194 * Read the input files; write the output file; display information. 195 */ 196static void 197btxld(const char *iname) 198{ 199 char name[FILENAME_MAX]; 200 struct btx_hdr btx, btxle; 201 struct hdr ihdr, ohdr; 202 unsigned int ldr_size, cwr; 203 int fdi[3], fdo, i; 204 205 ldr_size = 0; 206 207 for (i = I_LDR; i <= I_CLNT; i++) { 208 fname = i == I_LDR ? lname : i == I_BTX ? bname : iname; 209 if ((fdi[i] = open(fname, O_RDONLY)) == -1) 210 err(2, "%s", fname); 211 switch (i) { 212 case I_LDR: 213 gethdr(fdi[i], &ihdr); 214 if (ihdr.fmt != F_BIN) 215 Warn(fname, "Loader format is %s; processing as %s", 216 fmtlist[ihdr.fmt], fmtlist[F_BIN]); 217 ldr_size = ihdr.size; 218 break; 219 case I_BTX: 220 getbtx(fdi[i], &btx); 221 break; 222 case I_CLNT: 223 gethdr(fdi[i], &ihdr); 224 if (ihdr.org && ihdr.org != BTX_PGSIZE) 225 Warn(fname, 226 "Client origin is 0x%x; expecting 0 or 0x%x", 227 ihdr.org, BTX_PGSIZE); 228 } 229 } 230 memset(&ohdr, 0, sizeof(ohdr)); 231 ohdr.fmt = format; 232 ohdr.text = ldr_size; 233 ohdr.data = btx.btx_textsz + ihdr.size; 234 ohdr.org = lentry; 235 ohdr.entry = lentry; 236 cwr = 0; 237 if (wpage > 0 || (wpage == -1 && !(ihdr.flags & IMPURE))) { 238 if (wpage > 0) 239 cwr = wpage; 240 else { 241 cwr = howmany(ihdr.text, BTX_PGSIZE); 242 if (cwr > BTX_MAXCWR) 243 cwr = BTX_MAXCWR; 244 } 245 } 246 if (ppage > 0 || (ppage && wpage && ihdr.org >= BTX_PGSIZE)) { 247 btx.btx_flags |= BTX_MAPONE; 248 if (!cwr) 249 cwr++; 250 } 251 btx.btx_pgctl -= cwr; 252 btx.btx_entry = Eflag ? centry : ihdr.entry; 253 if ((size_t)snprintf(name, sizeof(name), "%s.tmp", oname) >= sizeof(name)) 254 errx(2, "%s: Filename too long", oname); 255 if ((fdo = open(name, O_CREAT | O_TRUNC | O_WRONLY, 0666)) == -1) 256 err(2, "%s", name); 257 if (!(tname = strdup(name))) 258 err(2, NULL); 259 puthdr(fdo, &ohdr); 260 for (i = I_LDR; i <= I_CLNT; i++) { 261 fname = i == I_LDR ? lname : i == I_BTX ? bname : iname; 262 switch (i) { 263 case I_LDR: 264 copy(fdi[i], fdo, ldr_size, 0); 265 seekx(fdo, ohdr.size += ohdr.text); 266 break; 267 case I_BTX: 268 btxle = btx; 269 btxle.btx_pgctl = htole16(btxle.btx_pgctl); 270 btxle.btx_textsz = htole16(btxle.btx_textsz); 271 btxle.btx_entry = htole32(btxle.btx_entry); 272 writex(fdo, &btxle, sizeof(btxle)); 273 copy(fdi[i], fdo, btx.btx_textsz - sizeof(btx), 274 sizeof(btx)); 275 break; 276 case I_CLNT: 277 copy(fdi[i], fdo, ihdr.size, 0); 278 if (ftruncate(fdo, ohdr.size += ohdr.data)) 279 err(2, "%s", tname); 280 } 281 if (close(fdi[i])) 282 err(2, "%s", fname); 283 } 284 if (close(fdo)) 285 err(2, "%s", tname); 286 if (rename(tname, oname)) 287 err(2, "%s: Can't rename to %s", tname, oname); 288 tname = NULL; 289 if (verbose) { 290 printf(binfo, btx.btx_majver, btx.btx_minver, btx.btx_textsz, 291 BTX_ORIGIN(btx), BTX_ENTRY(btx), BTX_MAPPED(btx) * 292 BTX_PGSIZE / 0x100000, !!(btx.btx_flags & BTX_MAPONE), 293 BTX_MAPPED(btx) - btx.btx_pgctl - BTX_PGBASE / 294 BTX_PGSIZE - BTX_MAPPED(btx) * 4 / BTX_PGSIZE); 295 printf(cinfo, fmtlist[ihdr.fmt], ihdr.size, ihdr.text, 296 ihdr.data, ihdr.bss, ihdr.entry); 297 printf(oinfo, fmtlist[ohdr.fmt], ohdr.size, ohdr.text, 298 ohdr.data, ohdr.org, ohdr.entry); 299 } 300} 301 302/* 303 * Read BTX file header. 304 */ 305static void 306getbtx(int fd, struct btx_hdr * btx) 307{ 308 if (readx(fd, btx, sizeof(*btx), 0) != sizeof(*btx) || 309 btx->btx_magic[0] != BTX_MAG0 || 310 btx->btx_magic[1] != BTX_MAG1 || 311 btx->btx_magic[2] != BTX_MAG2) 312 errx(1, "%s: Not a BTX kernel", fname); 313 btx->btx_pgctl = le16toh(btx->btx_pgctl); 314 btx->btx_textsz = le16toh(btx->btx_textsz); 315 btx->btx_entry = le32toh(btx->btx_entry); 316} 317 318/* 319 * Get file size and read a.out or ELF header. 320 */ 321static void 322gethdr(int fd, struct hdr *hdr) 323{ 324 struct stat sb; 325 const struct exec *ex; 326 const Elf32_Ehdr *ee; 327 const Elf32_Phdr *ep; 328 void *p; 329 unsigned int fmt, x, n, i; 330 331 memset(hdr, 0, sizeof(*hdr)); 332 if (fstat(fd, &sb)) 333 err(2, "%s", fname); 334 if (sb.st_size > MAXU32) 335 errx(1, "%s: Too big", fname); 336 hdr->size = sb.st_size; 337 if (!hdr->size) 338 return; 339 if ((p = mmap(NULL, hdr->size, PROT_READ, MAP_SHARED, fd, 340 0)) == MAP_FAILED) 341 err(2, "%s", fname); 342 for (fmt = F_CNT - 1; !hdr->fmt && fmt; fmt--) 343 switch (fmt) { 344 case F_AOUT: 345 ex = p; 346 if (hdr->size >= sizeof(struct exec) && !N_BADMAG(*ex)) { 347 hdr->fmt = fmt; 348 x = N_GETMAGIC(*ex); 349 if (x == OMAGIC || x == NMAGIC) { 350 if (x == NMAGIC) 351 Warn(fname, "Treating %s NMAGIC as OMAGIC", 352 fmtlist[fmt]); 353 hdr->flags |= IMPURE; 354 } 355 hdr->text = le32toh(ex->a_text); 356 hdr->data = le32toh(ex->a_data); 357 hdr->bss = le32toh(ex->a_bss); 358 hdr->entry = le32toh(ex->a_entry); 359 if (le32toh(ex->a_entry) >= BTX_PGSIZE) 360 hdr->org = BTX_PGSIZE; 361 } 362 break; 363 case F_ELF: 364 ee = p; 365 if (hdr->size >= sizeof(Elf32_Ehdr) && IS_ELF(*ee)) { 366 hdr->fmt = fmt; 367 for (n = i = 0; i < le16toh(ee->e_phnum); i++) { 368 ep = (void *)((uint8_t *)p + le32toh(ee->e_phoff) + 369 le16toh(ee->e_phentsize) * i); 370 if (le32toh(ep->p_type) == PT_LOAD) 371 switch (n++) { 372 case 0: 373 hdr->text = le32toh(ep->p_filesz); 374 hdr->org = le32toh(ep->p_paddr); 375 if (le32toh(ep->p_flags) & PF_W) 376 hdr->flags |= IMPURE; 377 break; 378 case 1: 379 hdr->data = le32toh(ep->p_filesz); 380 hdr->bss = le32toh(ep->p_memsz) - 381 le32toh(ep->p_filesz); 382 break; 383 case 2: 384 Warn(fname, 385 "Ignoring extra %s PT_LOAD segments", 386 fmtlist[fmt]); 387 } 388 } 389 hdr->entry = le32toh(ee->e_entry); 390 } 391 } 392 if (munmap(p, hdr->size)) 393 err(2, "%s", fname); 394} 395 396/* 397 * Write a.out or ELF header. 398 */ 399static void 400puthdr(int fd, struct hdr *hdr) 401{ 402 struct exec ex; 403 struct elfh eh; 404 405 switch (hdr->fmt) { 406 case F_AOUT: 407 memset(&ex, 0, sizeof(ex)); 408 N_SETMAGIC(ex, ZMAGIC, MID_I386, 0); 409 hdr->text = N_ALIGN(ex, hdr->text); 410 ex.a_text = htole32(hdr->text); 411 hdr->data = N_ALIGN(ex, hdr->data); 412 ex.a_data = htole32(hdr->data); 413 ex.a_entry = htole32(hdr->entry); 414 writex(fd, &ex, sizeof(ex)); 415 hdr->size = N_ALIGN(ex, sizeof(ex)); 416 seekx(fd, hdr->size); 417 break; 418 case F_ELF: 419 eh = elfhdr; 420 eh.e.e_entry = htole32(hdr->entry); 421 eh.p[0].p_vaddr = eh.p[0].p_paddr = htole32(hdr->org); 422 eh.p[0].p_filesz = eh.p[0].p_memsz = htole32(hdr->text); 423 eh.p[1].p_offset = htole32(le32toh(eh.p[0].p_offset) + 424 le32toh(eh.p[0].p_filesz)); 425 eh.p[1].p_vaddr = eh.p[1].p_paddr = 426 htole32(roundup2(le32toh(eh.p[0].p_paddr) + le32toh(eh.p[0].p_memsz), 427 4096)); 428 eh.p[1].p_filesz = eh.p[1].p_memsz = htole32(hdr->data); 429 eh.sh[2].sh_addr = eh.p[0].p_vaddr; 430 eh.sh[2].sh_offset = eh.p[0].p_offset; 431 eh.sh[2].sh_size = eh.p[0].p_filesz; 432 eh.sh[3].sh_addr = eh.p[1].p_vaddr; 433 eh.sh[3].sh_offset = eh.p[1].p_offset; 434 eh.sh[3].sh_size = eh.p[1].p_filesz; 435 writex(fd, &eh, sizeof(eh)); 436 hdr->size = sizeof(eh); 437 } 438} 439 440/* 441 * Safe copy from input file to output file. 442 */ 443static void 444copy(int fdi, int fdo, size_t nbyte, off_t offset) 445{ 446 char buf[8192]; 447 size_t n; 448 449 while (nbyte) { 450 if ((n = sizeof(buf)) > nbyte) 451 n = nbyte; 452 if (readx(fdi, buf, n, offset) != n) 453 errx(2, "%s: Short read", fname); 454 writex(fdo, buf, n); 455 nbyte -= n; 456 offset = -1; 457 } 458} 459 460/* 461 * Safe read from input file. 462 */ 463static size_t 464readx(int fd, void *buf, size_t nbyte, off_t offset) 465{ 466 ssize_t n; 467 468 if (offset != -1 && lseek(fd, offset, SEEK_SET) != offset) 469 err(2, "%s", fname); 470 if ((n = read(fd, buf, nbyte)) == -1) 471 err(2, "%s", fname); 472 return n; 473} 474 475/* 476 * Safe write to output file. 477 */ 478static void 479writex(int fd, const void *buf, size_t nbyte) 480{ 481 ssize_t n; 482 483 if ((n = write(fd, buf, nbyte)) == -1) 484 err(2, "%s", tname); 485 if ((size_t)n != nbyte) 486 errx(2, "%s: Short write", tname); 487} 488 489/* 490 * Safe seek in output file. 491 */ 492static void 493seekx(int fd, off_t offset) 494{ 495 if (lseek(fd, offset, SEEK_SET) != offset) 496 err(2, "%s", tname); 497} 498 499/* 500 * Convert an option argument to a format code. 501 */ 502static unsigned int 503optfmt(const char *arg) 504{ 505 unsigned int i; 506 507 for (i = 0; i < F_CNT && strcmp(arg, fmtlist[i]); i++); 508 if (i == F_CNT) 509 errx(1, "%s: Unknown format", arg); 510 return i; 511} 512 513/* 514 * Convert an option argument to an address. 515 */ 516static uint32_t 517optaddr(const char *arg) 518{ 519 char *s; 520 unsigned long x; 521 522 errno = 0; 523 x = strtoul(arg, &s, 0); 524 if (errno || !*arg || *s || x > MAXU32) 525 errx(1, "%s: Illegal address", arg); 526 return x; 527} 528 529/* 530 * Convert an option argument to a page number. 531 */ 532static int 533optpage(const char *arg, int hi) 534{ 535 char *s; 536 long x; 537 538 errno = 0; 539 x = strtol(arg, &s, 0); 540 if (errno || !*arg || *s || x < 0 || x > hi) 541 errx(1, "%s: Illegal page number", arg); 542 return x; 543} 544 545/* 546 * Display a warning. 547 */ 548static void 549Warn(const char *locus, const char *fmt, ...) 550{ 551 va_list ap; 552 char *s; 553 554 if (!quiet) { 555 asprintf(&s, "%s: Warning: %s", locus, fmt); 556 va_start(ap, fmt); 557 vwarnx(s, ap); 558 va_end(ap); 559 free(s); 560 } 561} 562 563/* 564 * Display usage information. 565 */ 566static void 567usage(void) 568{ 569 fprintf(stderr, "%s\n%s\n", 570 "usage: btxld [-qv] [-b file] [-E address] [-e address] [-f format]", 571 " [-l file] [-o filename] [-P page] [-W page] file"); 572 exit(1); 573} 574