Annotation of sys/lib/libsa/loadfile_elf.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_elf.c,v 1.1 2007/05/30 01:25:43 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: int ELFNAME(exec)(int, Elf_Ehdr *, u_long *, int);
! 76:
! 77: int
! 78: ELFNAME(exec)(int fd, Elf_Ehdr *elf, u_long *marks, int flags)
! 79: {
! 80: Elf_Shdr *shp;
! 81: Elf_Phdr *phdr;
! 82: Elf_Off off;
! 83: int i;
! 84: size_t sz;
! 85: int first;
! 86: int havesyms;
! 87: paddr_t minp = ~0, maxp = 0, pos = 0;
! 88: paddr_t offset = marks[MARK_START], shpp, elfp;
! 89:
! 90: sz = elf->e_phnum * sizeof(Elf_Phdr);
! 91: phdr = ALLOC(sz);
! 92:
! 93: if (lseek(fd, (off_t)elf->e_phoff, SEEK_SET) == -1) {
! 94: WARN(("lseek phdr"));
! 95: FREE(phdr, sz);
! 96: return 1;
! 97: }
! 98: if (read(fd, phdr, sz) != sz) {
! 99: WARN(("read program headers"));
! 100: FREE(phdr, sz);
! 101: return 1;
! 102: }
! 103:
! 104: for (first = 1, i = 0; i < elf->e_phnum; i++) {
! 105:
! 106: if (phdr[i].p_type != PT_LOAD ||
! 107: (phdr[i].p_flags & (PF_W|PF_R|PF_X)) == 0)
! 108: continue;
! 109:
! 110: #define IS_TEXT(p) (p.p_flags & PF_X)
! 111: #define IS_DATA(p) ((p.p_flags & PF_X) == 0)
! 112: #define IS_BSS(p) (p.p_filesz < p.p_memsz)
! 113: /*
! 114: * XXX: Assume first address is lowest
! 115: */
! 116: if ((IS_TEXT(phdr[i]) && (flags & LOAD_TEXT)) ||
! 117: (IS_DATA(phdr[i]) && (flags & LOAD_DATA))) {
! 118:
! 119: /* Read in segment. */
! 120: PROGRESS(("%s%lu", first ? "" : "+",
! 121: (u_long)phdr[i].p_filesz));
! 122:
! 123: if (lseek(fd, (off_t)phdr[i].p_offset, SEEK_SET) == -1) {
! 124: WARN(("lseek text"));
! 125: FREE(phdr, sz);
! 126: return 1;
! 127: }
! 128: if (READ(fd, phdr[i].p_vaddr, phdr[i].p_filesz) !=
! 129: phdr[i].p_filesz) {
! 130: WARN(("read text"));
! 131: FREE(phdr, sz);
! 132: return 1;
! 133: }
! 134: first = 0;
! 135:
! 136: }
! 137: if ((IS_TEXT(phdr[i]) && (flags & (LOAD_TEXT|COUNT_TEXT))) ||
! 138: (IS_DATA(phdr[i]) && (flags & (LOAD_DATA|COUNT_TEXT)))) {
! 139: pos = phdr[i].p_vaddr;
! 140: if (minp > pos)
! 141: minp = pos;
! 142: pos += phdr[i].p_filesz;
! 143: if (maxp < pos)
! 144: maxp = pos;
! 145: }
! 146:
! 147: /* Zero out bss. */
! 148: if (IS_BSS(phdr[i]) && (flags & LOAD_BSS)) {
! 149: PROGRESS(("+%lu",
! 150: (u_long)(phdr[i].p_memsz - phdr[i].p_filesz)));
! 151: BZERO((phdr[i].p_vaddr + phdr[i].p_filesz),
! 152: phdr[i].p_memsz - phdr[i].p_filesz);
! 153: }
! 154: if (IS_BSS(phdr[i]) && (flags & (LOAD_BSS|COUNT_BSS))) {
! 155: pos += phdr[i].p_memsz - phdr[i].p_filesz;
! 156: if (maxp < pos)
! 157: maxp = pos;
! 158: }
! 159: }
! 160: FREE(phdr, sz);
! 161:
! 162: /*
! 163: * Copy the ELF and section headers.
! 164: */
! 165: elfp = maxp = roundup(maxp, sizeof(long));
! 166: if (flags & (LOAD_HDR|COUNT_HDR))
! 167: maxp += sizeof(Elf_Ehdr);
! 168:
! 169: if (flags & (LOAD_SYM|COUNT_SYM)) {
! 170: if (lseek(fd, (off_t)elf->e_shoff, SEEK_SET) == -1) {
! 171: WARN(("lseek section headers"));
! 172: return 1;
! 173: }
! 174: sz = elf->e_shnum * sizeof(Elf_Shdr);
! 175: shp = ALLOC(sz);
! 176:
! 177: if (read(fd, shp, sz) != sz) {
! 178: WARN(("read section headers"));
! 179: FREE(shp, sz);
! 180: return 1;
! 181: }
! 182:
! 183: shpp = maxp;
! 184: maxp += roundup(sz, sizeof(long));
! 185:
! 186: /*
! 187: * Now load the symbol sections themselves. Make sure the
! 188: * sections are aligned. Don't bother with string tables if
! 189: * there are no symbol sections.
! 190: */
! 191: off = roundup((sizeof(Elf_Ehdr) + sz), sizeof(long));
! 192:
! 193: for (havesyms = i = 0; i < elf->e_shnum; i++)
! 194: if (shp[i].sh_type == SHT_SYMTAB)
! 195: havesyms = 1;
! 196:
! 197: for (first = 1, i = 0; i < elf->e_shnum; i++) {
! 198: if (shp[i].sh_type == SHT_SYMTAB ||
! 199: shp[i].sh_type == SHT_STRTAB) {
! 200: if (havesyms && (flags & LOAD_SYM)) {
! 201: PROGRESS(("%s%ld", first ? " [" : "+",
! 202: (u_long)shp[i].sh_size));
! 203: if (lseek(fd, (off_t)shp[i].sh_offset,
! 204: SEEK_SET) == -1) {
! 205: WARN(("lseek symbols"));
! 206: FREE(shp, sz);
! 207: return 1;
! 208: }
! 209: if (READ(fd, maxp, shp[i].sh_size) !=
! 210: shp[i].sh_size) {
! 211: WARN(("read symbols"));
! 212: FREE(shp, sz);
! 213: return 1;
! 214: }
! 215: }
! 216: maxp += roundup(shp[i].sh_size,
! 217: sizeof(long));
! 218: shp[i].sh_offset = off;
! 219: off += roundup(shp[i].sh_size, sizeof(long));
! 220: first = 0;
! 221: }
! 222: }
! 223: if (flags & LOAD_SYM) {
! 224: BCOPY(shp, shpp, sz);
! 225:
! 226: if (havesyms && first == 0)
! 227: PROGRESS(("]"));
! 228: }
! 229: FREE(shp, sz);
! 230: }
! 231:
! 232: /*
! 233: * Frob the copied ELF header to give information relative
! 234: * to elfp.
! 235: */
! 236: if (flags & LOAD_HDR) {
! 237: elf->e_phoff = 0;
! 238: elf->e_shoff = sizeof(Elf_Ehdr);
! 239: elf->e_phentsize = 0;
! 240: elf->e_phnum = 0;
! 241: BCOPY(elf, elfp, sizeof(*elf));
! 242: }
! 243:
! 244: marks[MARK_START] = LOADADDR(minp);
! 245: marks[MARK_ENTRY] = LOADADDR(elf->e_entry);
! 246: marks[MARK_NSYM] = 1; /* XXX: Kernel needs >= 0 */
! 247: marks[MARK_SYM] = LOADADDR(elfp);
! 248: marks[MARK_END] = LOADADDR(maxp);
! 249: return 0;
! 250: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to loadfile_elf.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / lib / libsa