Annotation of sys/lib/libsa/loadfile.c, Revision 1.1
1.1 ! nbrk 1: /* $NetBSD: loadfile.c,v 1.10 2000/12/03 02:53:04 tsutsui Exp $ */
! 2: /* $OpenBSD: loadfile.c,v 1.14 2007/06/26 10:32:50 tom Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1997 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
! 10: * NASA Ames Research Center and by Christos Zoulas.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: /*
! 42: * Copyright (c) 1992, 1993
! 43: * The Regents of the University of California. All rights reserved.
! 44: *
! 45: * This code is derived from software contributed to Berkeley by
! 46: * Ralph Campbell.
! 47: *
! 48: * Redistribution and use in source and binary forms, with or without
! 49: * modification, are permitted provided that the following conditions
! 50: * are met:
! 51: * 1. Redistributions of source code must retain the above copyright
! 52: * notice, this list of conditions and the following disclaimer.
! 53: * 2. Redistributions in binary form must reproduce the above copyright
! 54: * notice, this list of conditions and the following disclaimer in the
! 55: * documentation and/or other materials provided with the distribution.
! 56: * 3. Neither the name of the University nor the names of its contributors
! 57: * may be used to endorse or promote products derived from this software
! 58: * without specific prior written permission.
! 59: *
! 60: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 61: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 62: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 63: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 64: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 65: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 66: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 67: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 68: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 69: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 70: * SUCH DAMAGE.
! 71: *
! 72: * @(#)boot.c 8.1 (Berkeley) 6/10/93
! 73: */
! 74:
! 75: #ifdef _STANDALONE
! 76: #include <lib/libkern/libkern.h>
! 77: #include <lib/libsa/stand.h>
! 78: #else
! 79: #include <stdio.h>
! 80: #include <string.h>
! 81: #include <errno.h>
! 82: #include <stdlib.h>
! 83: #include <unistd.h>
! 84: #include <fcntl.h>
! 85: #include <err.h>
! 86: #endif
! 87:
! 88: #include <sys/param.h>
! 89: #include <sys/exec.h>
! 90:
! 91: #include "loadfile.h"
! 92:
! 93: #ifdef BOOT_ECOFF
! 94: #include <sys/exec_ecoff.h>
! 95: static int coff_exec(int, struct ecoff_exechdr *, u_long *, int);
! 96: #endif
! 97: #ifdef BOOT_AOUT
! 98: #include <sys/exec_aout.h>
! 99: static int aout_exec(int, struct exec *, u_long *, int);
! 100: #endif
! 101:
! 102: #ifdef BOOT_ELF
! 103: #include <sys/exec_elf.h>
! 104: #if defined(BOOT_ELF32) && defined(BOOT_ELF64)
! 105: /*
! 106: * Both defined, so elf32_exec() and elf64_exec() need to be separately
! 107: * created (can't do it by including loadfile_elf.c here).
! 108: */
! 109: int elf32_exec(int, Elf32_Ehdr *, u_long *, int);
! 110: int elf64_exec(int, Elf64_Ehdr *, u_long *, int);
! 111: #else
! 112: #include "loadfile_elf.c"
! 113: #endif
! 114: #endif
! 115:
! 116: /*
! 117: * Open 'filename', read in program and return -1 on error otherwise fd,
! 118: * with file still open.
! 119: * Also fills in marks.
! 120: */
! 121: int
! 122: loadfile(const char *fname, u_long *marks, int flags)
! 123: {
! 124: union {
! 125: #ifdef BOOT_ECOFF
! 126: struct ecoff_exechdr coff;
! 127: #endif
! 128: #if defined(BOOT_ELF32) || (defined(BOOT_ELF) && ELFSIZE == 32)
! 129: Elf32_Ehdr elf32;
! 130: #endif
! 131: #if defined(BOOT_ELF64) || (defined(BOOT_ELF) && ELFSIZE == 64)
! 132: Elf64_Ehdr elf64;
! 133: #endif
! 134: #ifdef BOOT_AOUT
! 135: struct exec aout;
! 136: #endif
! 137:
! 138: } hdr;
! 139: ssize_t nr;
! 140: int fd, rval;
! 141:
! 142: /* Open the file. */
! 143: if ((fd = open(fname, 0)) < 0) {
! 144: WARN(("open %s", fname ? fname : "<default>"));
! 145: return -1;
! 146: }
! 147:
! 148: /* Read the exec header. */
! 149: if ((nr = read(fd, &hdr, sizeof(hdr))) != sizeof(hdr)) {
! 150: WARN(("read header"));
! 151: goto err;
! 152: }
! 153:
! 154: #ifdef BOOT_ECOFF
! 155: if (!ECOFF_BADMAG(&hdr.coff)) {
! 156: rval = coff_exec(fd, &hdr.coff, marks, flags);
! 157: } else
! 158: #endif
! 159: #if defined(BOOT_ELF32) || (defined(BOOT_ELF) && ELFSIZE == 32)
! 160: if (memcmp(hdr.elf32.e_ident, ELFMAG, SELFMAG) == 0 &&
! 161: hdr.elf32.e_ident[EI_CLASS] == ELFCLASS32) {
! 162: rval = elf32_exec(fd, &hdr.elf32, marks, flags);
! 163: } else
! 164: #endif
! 165: #if defined(BOOT_ELF64) || (defined(BOOT_ELF) && ELFSIZE == 64)
! 166: if (memcmp(hdr.elf64.e_ident, ELFMAG, SELFMAG) == 0 &&
! 167: hdr.elf64.e_ident[EI_CLASS] == ELFCLASS64) {
! 168: rval = elf64_exec(fd, &hdr.elf64, marks, flags);
! 169: } else
! 170: #endif
! 171: #ifdef BOOT_AOUT
! 172: if (OKMAGIC(N_GETMAGIC(hdr.aout))
! 173: #ifndef NO_MID_CHECK
! 174: && N_GETMID(hdr.aout) == MID_MACHINE
! 175: #endif
! 176: ) {
! 177: rval = aout_exec(fd, &hdr.aout, marks, flags);
! 178: } else
! 179: #endif
! 180: {
! 181: rval = 1;
! 182: errno = EFTYPE;
! 183: WARN(("%s", fname ? fname : "<default>"));
! 184: }
! 185:
! 186: if (rval == 0) {
! 187: PROGRESS(("=0x%lx\n", marks[MARK_END] - marks[MARK_START]));
! 188: return fd;
! 189: }
! 190: err:
! 191: (void)close(fd);
! 192: return -1;
! 193: }
! 194:
! 195: #ifdef BOOT_ECOFF
! 196: static int
! 197: coff_exec(int fd, struct ecoff_exechdr *coff, u_long *marks, int flags)
! 198: {
! 199: paddr_t offset = marks[MARK_START];
! 200: paddr_t minp = ~0, maxp = 0, pos;
! 201:
! 202: /* Read in text. */
! 203: if (lseek(fd, ECOFF_TXTOFF(coff), SEEK_SET) == -1) {
! 204: WARN(("lseek text"));
! 205: return 1;
! 206: }
! 207:
! 208: if (coff->a.tsize != 0) {
! 209: if (flags & LOAD_TEXT) {
! 210: PROGRESS(("%lu", coff->a.tsize));
! 211: if (READ(fd, coff->a.text_start, coff->a.tsize) !=
! 212: coff->a.tsize) {
! 213: return 1;
! 214: }
! 215: }
! 216: else {
! 217: if (lseek(fd, coff->a.tsize, SEEK_CUR) == -1) {
! 218: WARN(("read text"));
! 219: return 1;
! 220: }
! 221: }
! 222: if (flags & (COUNT_TEXT|LOAD_TEXT)) {
! 223: pos = coff->a.text_start;
! 224: if (minp > pos)
! 225: minp = pos;
! 226: pos += coff->a.tsize;
! 227: if (maxp < pos)
! 228: maxp = pos;
! 229: }
! 230: }
! 231:
! 232: /* Read in data. */
! 233: if (coff->a.dsize != 0) {
! 234: if (flags & LOAD_DATA) {
! 235: PROGRESS(("+%lu", coff->a.dsize));
! 236: if (READ(fd, coff->a.data_start, coff->a.dsize) !=
! 237: coff->a.dsize) {
! 238: WARN(("read data"));
! 239: return 1;
! 240: }
! 241: }
! 242: if (flags & (COUNT_DATA|LOAD_DATA)) {
! 243: pos = coff->a.data_start;
! 244: if (minp > pos)
! 245: minp = pos;
! 246: pos += coff->a.dsize;
! 247: if (maxp < pos)
! 248: maxp = pos;
! 249: }
! 250: }
! 251:
! 252: /* Zero out bss. */
! 253: if (coff->a.bsize != 0) {
! 254: if (flags & LOAD_BSS) {
! 255: PROGRESS(("+%lu", coff->a.bsize));
! 256: BZERO(coff->a.bss_start, coff->a.bsize);
! 257: }
! 258: if (flags & (COUNT_BSS|LOAD_BSS)) {
! 259: pos = coff->a.bss_start;
! 260: if (minp > pos)
! 261: minp = pos;
! 262: pos = coff->a.bsize;
! 263: if (maxp < pos)
! 264: maxp = pos;
! 265: }
! 266: }
! 267:
! 268: marks[MARK_START] = LOADADDR(minp);
! 269: marks[MARK_ENTRY] = LOADADDR(coff->a.entry);
! 270: marks[MARK_NSYM] = 1; /* XXX: Kernel needs >= 0 */
! 271: marks[MARK_SYM] = LOADADDR(maxp);
! 272: marks[MARK_END] = LOADADDR(maxp);
! 273: return 0;
! 274: }
! 275: #endif /* BOOT_ECOFF */
! 276:
! 277: #ifdef BOOT_AOUT
! 278: static int
! 279: aout_exec(int fd, struct exec *x, u_long *marks, int flags)
! 280: {
! 281: u_long entry = x->a_entry;
! 282: paddr_t aoutp = 0;
! 283: paddr_t minp, maxp;
! 284: int cc;
! 285: paddr_t offset = marks[MARK_START];
! 286: u_long magic = N_GETMAGIC(*x);
! 287: int sub;
! 288:
! 289: /* In OMAGIC and NMAGIC, exec header isn't part of text segment */
! 290: if (magic == OMAGIC || magic == NMAGIC)
! 291: sub = 0;
! 292: else
! 293: sub = sizeof(*x);
! 294:
! 295: minp = maxp = ALIGNENTRY(entry);
! 296:
! 297: if (lseek(fd, sizeof(*x), SEEK_SET) == -1) {
! 298: WARN(("lseek text"));
! 299: return 1;
! 300: }
! 301:
! 302: /*
! 303: * Leave a copy of the exec header before the text.
! 304: * The kernel may use this to verify that the
! 305: * symbols were loaded by this boot program.
! 306: */
! 307: if (magic == OMAGIC || magic == NMAGIC) {
! 308: if (flags & LOAD_HDR && maxp >= sizeof(*x))
! 309: BCOPY(x, maxp - sizeof(*x), sizeof(*x));
! 310: }
! 311: else {
! 312: if (flags & LOAD_HDR)
! 313: BCOPY(x, maxp, sizeof(*x));
! 314: if (flags & (LOAD_HDR|COUNT_HDR))
! 315: maxp += sizeof(*x);
! 316: }
! 317:
! 318: /*
! 319: * Read in the text segment.
! 320: */
! 321: if (flags & LOAD_TEXT) {
! 322: PROGRESS(("%ld", x->a_text));
! 323:
! 324: if (READ(fd, maxp, x->a_text - sub) != x->a_text - sub) {
! 325: WARN(("read text"));
! 326: return 1;
! 327: }
! 328: } else {
! 329: if (lseek(fd, x->a_text - sub, SEEK_CUR) == -1) {
! 330: WARN(("seek text"));
! 331: return 1;
! 332: }
! 333: }
! 334: if (flags & (LOAD_TEXT|COUNT_TEXT))
! 335: maxp += x->a_text - sub;
! 336:
! 337: /*
! 338: * Provide alignment if required
! 339: */
! 340: if (magic == ZMAGIC || magic == NMAGIC) {
! 341: int size = -(unsigned int)maxp & (__LDPGSZ - 1);
! 342:
! 343: if (flags & LOAD_TEXTA) {
! 344: PROGRESS(("/%d", size));
! 345: BZERO(maxp, size);
! 346: }
! 347:
! 348: if (flags & (LOAD_TEXTA|COUNT_TEXTA))
! 349: maxp += size;
! 350: }
! 351:
! 352: /*
! 353: * Read in the data segment.
! 354: */
! 355: if (flags & LOAD_DATA) {
! 356: PROGRESS(("+%ld", x->a_data));
! 357:
! 358: if (READ(fd, maxp, x->a_data) != x->a_data) {
! 359: WARN(("read data"));
! 360: return 1;
! 361: }
! 362: }
! 363: else {
! 364: if (lseek(fd, x->a_data, SEEK_CUR) == -1) {
! 365: WARN(("seek data"));
! 366: return 1;
! 367: }
! 368: }
! 369: if (flags & (LOAD_DATA|COUNT_DATA))
! 370: maxp += x->a_data;
! 371:
! 372: /*
! 373: * Zero out the BSS section.
! 374: * (Kernel doesn't care, but do it anyway.)
! 375: */
! 376: if (flags & LOAD_BSS) {
! 377: PROGRESS(("+%ld", x->a_bss));
! 378:
! 379: BZERO(maxp, x->a_bss);
! 380: }
! 381:
! 382: if (flags & (LOAD_BSS|COUNT_BSS))
! 383: maxp += x->a_bss;
! 384:
! 385: /*
! 386: * Read in the symbol table and strings.
! 387: * (Always set the symtab size word.)
! 388: */
! 389: if (flags & LOAD_SYM)
! 390: BCOPY(&x->a_syms, maxp, sizeof(x->a_syms));
! 391:
! 392: if (flags & (LOAD_SYM|COUNT_SYM)) {
! 393: maxp += sizeof(x->a_syms);
! 394: aoutp = maxp;
! 395: }
! 396:
! 397: if (x->a_syms > 0) {
! 398: /* Symbol table and string table length word. */
! 399:
! 400: if (flags & LOAD_SYM) {
! 401: PROGRESS(("+[%ld", x->a_syms));
! 402:
! 403: if (READ(fd, maxp, x->a_syms) != x->a_syms) {
! 404: WARN(("read symbols"));
! 405: return 1;
! 406: }
! 407: } else {
! 408: if (lseek(fd, x->a_syms, SEEK_CUR) == -1) {
! 409: WARN(("seek symbols"));
! 410: return 1;
! 411: }
! 412: }
! 413: if (flags & (LOAD_SYM|COUNT_SYM))
! 414: maxp += x->a_syms;
! 415:
! 416: if (read(fd, &cc, sizeof(cc)) != sizeof(cc)) {
! 417: WARN(("read string table"));
! 418: return 1;
! 419: }
! 420:
! 421: if (flags & LOAD_SYM) {
! 422: BCOPY(&cc, maxp, sizeof(cc));
! 423:
! 424: /* String table. Length word includes itself. */
! 425:
! 426: PROGRESS(("+%d]", cc));
! 427: }
! 428: if (flags & (LOAD_SYM|COUNT_SYM))
! 429: maxp += sizeof(cc);
! 430:
! 431: cc -= sizeof(int);
! 432: if (cc <= 0) {
! 433: WARN(("symbol table too short"));
! 434: return 1;
! 435: }
! 436:
! 437: if (flags & LOAD_SYM) {
! 438: if (READ(fd, maxp, cc) != cc) {
! 439: WARN(("read strings"));
! 440: return 1;
! 441: }
! 442: } else {
! 443: if (lseek(fd, cc, SEEK_CUR) == -1) {
! 444: WARN(("seek strings"));
! 445: return 1;
! 446: }
! 447: }
! 448: if (flags & (LOAD_SYM|COUNT_SYM))
! 449: maxp += cc;
! 450: }
! 451:
! 452: marks[MARK_START] = LOADADDR(minp);
! 453: marks[MARK_ENTRY] = LOADADDR(entry);
! 454: marks[MARK_NSYM] = x->a_syms;
! 455: marks[MARK_SYM] = LOADADDR(aoutp);
! 456: marks[MARK_END] = LOADADDR(maxp);
! 457: return 0;
! 458: }
! 459: #endif /* BOOT_AOUT */
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