| 1 |
1325 |
phoenix |
/* vi: set sw=4 ts=4: */
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/*
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* A small little readelf implementation for uClibc
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*
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* Copyright (C) 2000 by Lineo, inc and Erik Andersen
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* Copyright (C) 2000-2002 Erik Andersen <andersee@debian.org>
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*
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* Several functions in this file (specifically, elf_find_section_type(),
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* elf_find_phdr_type(), and elf_find_dynamic(), were stolen from elflib.c from
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* elfvector (http://www.BitWagon.com/elfvector.html) by John F. Reiser
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* <jreiser@BitWagon.com>, which is copyright 2000 BitWagon Software LLC
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* (GPL2).
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "bswap.h"
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#include "elf.h"
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int byteswap;
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inline uint32_t byteswap32_to_host(uint32_t value)
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{
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if (byteswap==1) {
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return(bswap_32(value));
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} else {
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return(value);
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}
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}
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Elf32_Shdr * elf_find_section_type( int key, Elf32_Ehdr *ehdr)
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{
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int j;
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Elf32_Shdr *shdr = (Elf32_Shdr *)(ehdr->e_shoff + (char *)ehdr);
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for (j = ehdr->e_shnum; --j>=0; ++shdr) {
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if (key==(int)byteswap32_to_host(shdr->sh_type)) {
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return shdr;
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}
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}
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return NULL;
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}
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Elf32_Phdr * elf_find_phdr_type( int type, Elf32_Ehdr *ehdr)
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{
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int j;
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Elf32_Phdr *phdr = (Elf32_Phdr *)(ehdr->e_phoff + (char *)ehdr);
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for (j = ehdr->e_phnum; --j>=0; ++phdr) {
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if (type==(int)byteswap32_to_host(phdr->p_type)) {
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return phdr;
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}
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}
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return NULL;
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}
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/* Returns value if return_val==1, ptr otherwise */
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void * elf_find_dynamic(int const key, Elf32_Dyn *dynp,
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Elf32_Ehdr *ehdr, int return_val)
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{
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Elf32_Phdr *pt_text = elf_find_phdr_type(PT_LOAD, ehdr);
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unsigned tx_reloc = byteswap32_to_host(pt_text->p_vaddr) - byteswap32_to_host(pt_text->p_offset);
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for (; DT_NULL!=byteswap32_to_host(dynp->d_tag); ++dynp) {
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if (key == (int)byteswap32_to_host(dynp->d_tag)) {
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if (return_val == 1)
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return (void *)(intptr_t)byteswap32_to_host(dynp->d_un.d_val);
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else
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return (void *)(byteswap32_to_host(dynp->d_un.d_val) - tx_reloc + (char *)ehdr );
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}
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}
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return NULL;
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}
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int check_elf_header(Elf32_Ehdr *const ehdr)
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{
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if (! ehdr || strncmp((void *)ehdr, ELFMAG, SELFMAG) != 0 ||
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ehdr->e_ident[EI_CLASS] != ELFCLASS32 ||
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ehdr->e_ident[EI_VERSION] != EV_CURRENT)
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{
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return 1;
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}
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/* Check if the target endianness matches the host's endianness */
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byteswap = 0;
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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if (ehdr->e_ident[5] == ELFDATA2MSB) {
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/* Ick -- we will have to byte-swap everything */
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byteswap = 1;
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}
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#elif __BYTE_ORDER == __BIG_ENDIAN
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if (ehdr->e_ident[5] == ELFDATA2LSB) {
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byteswap = 1;
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}
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#else
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#error Unknown host byte order!
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#endif
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/* Be vary lazy, and only byteswap the stuff we use */
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if (byteswap==1) {
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ehdr->e_type=bswap_16(ehdr->e_type);
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ehdr->e_machine=bswap_16(ehdr->e_machine);
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ehdr->e_phoff=bswap_32(ehdr->e_phoff);
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ehdr->e_shoff=bswap_32(ehdr->e_shoff);
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ehdr->e_phnum=bswap_16(ehdr->e_phnum);
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ehdr->e_shnum=bswap_16(ehdr->e_shnum);
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}
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return 0;
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}
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#define ELFOSABI_NONE 0 /* UNIX System V ABI */
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#define ELFOSABI_HPUX 1 /* HP-UX operating system */
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#define ELFOSABI_NETBSD 2 /* NetBSD */
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#define ELFOSABI_LINUX 3 /* GNU/Linux */
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#define ELFOSABI_HURD 4 /* GNU/Hurd */
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#define ELFOSABI_SOLARIS 6 /* Solaris */
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#define ELFOSABI_AIX 7 /* AIX */
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#define ELFOSABI_IRIX 8 /* IRIX */
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#define ELFOSABI_FREEBSD 9 /* FreeBSD */
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#define ELFOSABI_TRU64 10 /* TRU64 UNIX */
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#define ELFOSABI_MODESTO 11 /* Novell Modesto */
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#define ELFOSABI_OPENBSD 12 /* OpenBSD */
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#define ELFOSABI_STANDALONE 255 /* Standalone (embedded) application */
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#define ELFOSABI_ARM 97 /* ARM */
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static void describe_elf_hdr(Elf32_Ehdr* ehdr)
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{
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char *tmp, *tmp1;
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switch (ehdr->e_type) {
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case ET_NONE: tmp = "None"; tmp1 = "NONE"; break;
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case ET_REL: tmp = "Relocatable File"; tmp1 = "REL"; break;
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case ET_EXEC: tmp = "Executable file"; tmp1 = "EXEC"; break;
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case ET_DYN: tmp = "Shared object file"; tmp1 = "DYN"; break;
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case ET_CORE: tmp = "Core file"; tmp1 = "CORE"; break;
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default:
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tmp = tmp1 = "Unknown";
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}
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printf( "Type:\t\t%s (%s)\n", tmp1, tmp);
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| 159 |
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switch (ehdr->e_machine) {
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case EM_NONE: tmp="No machine"; break;
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case EM_M32: tmp="AT&T WE 32100"; break;
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case EM_SPARC: tmp="SUN SPARC"; break;
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case EM_386: tmp="Intel 80386"; break;
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case EM_68K: tmp="Motorola m68k family"; break;
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case EM_88K: tmp="Motorola m88k family"; break;
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case EM_860: tmp="Intel 80860"; break;
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case EM_MIPS: tmp="MIPS R3000 big-endian"; break;
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case EM_S370: tmp="IBM System/370"; break;
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case EM_MIPS_RS3_LE: tmp="MIPS R3000 little-endian"; break;
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case EM_PARISC: tmp="HPPA"; break;
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case EM_VPP500: tmp="Fujitsu VPP500"; break;
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case EM_SPARC32PLUS: tmp="Sun's v8plus"; break;
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case EM_960: tmp="Intel 80960"; break;
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case EM_PPC: tmp="PowerPC"; break;
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case EM_PPC64: tmp="PowerPC 64-bit"; break;
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case EM_S390: tmp="IBM S390"; break;
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| 178 |
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case EM_V800: tmp="NEC V800 series"; break;
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| 179 |
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case EM_FR20: tmp="Fujitsu FR20"; break;
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| 180 |
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case EM_RH32: tmp="TRW RH-32"; break;
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case EM_RCE: tmp="Motorola RCE"; break;
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| 182 |
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case EM_ARM: tmp="ARM"; break;
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| 183 |
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case EM_FAKE_ALPHA: tmp="Digital Alpha"; break;
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| 184 |
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case EM_SH: tmp="Renesas SH"; break;
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| 185 |
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case EM_SPARCV9: tmp="SPARC v9 64-bit"; break;
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| 186 |
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case EM_TRICORE: tmp="Siemens Tricore"; break;
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| 187 |
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case EM_ARC: tmp="Argonaut RISC Core"; break;
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| 188 |
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case EM_H8_300: tmp="Renesas H8/300"; break;
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| 189 |
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case EM_H8_300H: tmp="Renesas H8/300H"; break;
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| 190 |
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case EM_H8S: tmp="Renesas H8S"; break;
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case EM_H8_500: tmp="Renesas H8/500"; break;
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| 192 |
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case EM_IA_64: tmp="Intel Merced"; break;
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| 193 |
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case EM_MIPS_X: tmp="Stanford MIPS-X"; break;
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case EM_COLDFIRE: tmp="Motorola Coldfire"; break;
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case EM_68HC12: tmp="Motorola M68HC12"; break;
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case EM_MMA: tmp="Fujitsu MMA Multimedia Accelerator"; break;
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case EM_PCP: tmp="Siemens PCP"; break;
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| 198 |
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case EM_NCPU: tmp="Sony nCPU embeeded RISC"; break;
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| 199 |
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case EM_NDR1: tmp="Denso NDR1 microprocessor"; break;
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| 200 |
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case EM_STARCORE: tmp="Motorola Start*Core processor"; break;
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| 201 |
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case EM_ME16: tmp="Toyota ME16 processor"; break;
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| 202 |
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case EM_ST100: tmp="STMicroelectronic ST100 processor"; break;
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| 203 |
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case EM_TINYJ: tmp="Advanced Logic Corp. Tinyj emb.fam"; break;
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| 204 |
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case EM_X86_64: tmp="AMD x86-64 architecture"; break;
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| 205 |
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case EM_PDSP: tmp="Sony DSP Processor"; break;
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| 206 |
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case EM_FX66: tmp="Siemens FX66 microcontroller"; break;
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| 207 |
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case EM_ST9PLUS: tmp="STMicroelectronics ST9+ 8/16 mc"; break;
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| 208 |
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case EM_ST7: tmp="STmicroelectronics ST7 8 bit mc"; break;
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| 209 |
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case EM_68HC16: tmp="Motorola MC68HC16 microcontroller"; break;
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| 210 |
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case EM_68HC11: tmp="Motorola MC68HC11 microcontroller"; break;
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| 211 |
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case EM_68HC08: tmp="Motorola MC68HC08 microcontroller"; break;
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| 212 |
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case EM_68HC05: tmp="Motorola MC68HC05 microcontroller"; break;
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| 213 |
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case EM_SVX: tmp="Silicon Graphics SVx"; break;
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| 214 |
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case EM_AT19: tmp="STMicroelectronics ST19 8 bit mc"; break;
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| 215 |
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case EM_VAX: tmp="Digital VAX"; break;
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| 216 |
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case EM_CRIS: tmp="Axis Communications 32-bit embedded processor"; break;
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| 217 |
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case EM_JAVELIN: tmp="Infineon Technologies 32-bit embedded processor"; break;
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| 218 |
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case EM_FIREPATH: tmp="Element 14 64-bit DSP Processor"; break;
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| 219 |
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case EM_ZSP: tmp="LSI Logic 16-bit DSP Processor"; break;
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| 220 |
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case EM_MMIX: tmp="Donald Knuth's educational 64-bit processor"; break;
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| 221 |
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case EM_HUANY: tmp="Harvard University machine-independent object files"; break;
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| 222 |
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case EM_PRISM: tmp="SiTera Prism"; break;
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| 223 |
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case EM_AVR: tmp="Atmel AVR 8-bit microcontroller"; break;
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| 224 |
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case EM_FR30: tmp="Fujitsu FR30"; break;
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| 225 |
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case EM_D10V: tmp="Mitsubishi D10V"; break;
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| 226 |
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case EM_D30V: tmp="Mitsubishi D30V"; break;
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| 227 |
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case EM_V850: tmp="NEC v850"; break;
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| 228 |
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case EM_M32R: tmp="Renesas M32R"; break;
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| 229 |
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case EM_MN10300: tmp="Matsushita MN10300"; break;
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| 230 |
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case EM_MN10200: tmp="Matsushita MN10200"; break;
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| 231 |
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case EM_PJ: tmp="picoJava"; break;
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| 232 |
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default: tmp="unknown";
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| 233 |
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}
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| 234 |
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printf( "Machine:\t%s\n", tmp);
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| 235 |
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| 236 |
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switch (ehdr->e_ident[EI_CLASS]) {
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| 237 |
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case ELFCLASSNONE: tmp = "Invalid class"; break;
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| 238 |
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case ELFCLASS32: tmp = "ELF32"; break;
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| 239 |
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case ELFCLASS64: tmp = "ELF64"; break;
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| 240 |
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default: tmp = "Unknown";
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| 241 |
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}
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| 242 |
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printf( "Class:\t\t%s\n", tmp);
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| 243 |
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| 244 |
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switch (ehdr->e_ident[EI_DATA]) {
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| 245 |
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case ELFDATANONE: tmp = "Invalid data encoding"; break;
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| 246 |
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case ELFDATA2LSB: tmp = "2's complement, little endian"; break;
|
| 247 |
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case ELFDATA2MSB: tmp = "2's complement, big endian"; break;
|
| 248 |
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default: tmp = "Unknown";
|
| 249 |
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}
|
| 250 |
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printf( "Data:\t\t%s\n", tmp);
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| 251 |
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| 252 |
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printf( "Version:\t%d %s\n", ehdr->e_ident[EI_VERSION],
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| 253 |
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(ehdr->e_ident[EI_VERSION]==EV_CURRENT)?
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| 254 |
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"(current)" : "(unknown: %lx)");
|
| 255 |
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|
|
| 256 |
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switch (ehdr->e_ident[EI_OSABI]) {
|
| 257 |
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case ELFOSABI_SYSV: tmp ="UNIX - System V"; break;
|
| 258 |
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case ELFOSABI_HPUX: tmp ="UNIX - HP-UX"; break;
|
| 259 |
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case ELFOSABI_NETBSD: tmp ="UNIX - NetBSD"; break;
|
| 260 |
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case ELFOSABI_LINUX: tmp ="UNIX - Linux"; break;
|
| 261 |
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case ELFOSABI_HURD: tmp ="GNU/Hurd"; break;
|
| 262 |
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case ELFOSABI_SOLARIS: tmp ="UNIX - Solaris"; break;
|
| 263 |
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case ELFOSABI_AIX: tmp ="UNIX - AIX"; break;
|
| 264 |
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case ELFOSABI_IRIX: tmp ="UNIX - IRIX"; break;
|
| 265 |
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case ELFOSABI_FREEBSD: tmp ="UNIX - FreeBSD"; break;
|
| 266 |
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case ELFOSABI_TRU64: tmp ="UNIX - TRU64"; break;
|
| 267 |
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case ELFOSABI_MODESTO: tmp ="Novell - Modesto"; break;
|
| 268 |
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case ELFOSABI_OPENBSD: tmp ="UNIX - OpenBSD"; break;
|
| 269 |
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case ELFOSABI_STANDALONE: tmp ="Standalone App"; break;
|
| 270 |
|
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case ELFOSABI_ARM: tmp ="ARM"; break;
|
| 271 |
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default: tmp = "Unknown";
|
| 272 |
|
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}
|
| 273 |
|
|
printf( "OS/ABI:\t\t%s\n", tmp);
|
| 274 |
|
|
|
| 275 |
|
|
printf( "ABI Version:\t%d\n", ehdr->e_ident[EI_ABIVERSION]);
|
| 276 |
|
|
}
|
| 277 |
|
|
|
| 278 |
|
|
static void list_needed_libraries(Elf32_Dyn* dynamic, char *strtab)
|
| 279 |
|
|
{
|
| 280 |
|
|
Elf32_Dyn *dyns;
|
| 281 |
|
|
|
| 282 |
|
|
printf("Dependancies:\n");
|
| 283 |
|
|
for (dyns=dynamic; byteswap32_to_host(dyns->d_tag)!=DT_NULL; ++dyns) {
|
| 284 |
|
|
if (dyns->d_tag == DT_NEEDED) {
|
| 285 |
|
|
printf("\t%s\n", (char*)strtab + byteswap32_to_host(dyns->d_un.d_val));
|
| 286 |
|
|
}
|
| 287 |
|
|
}
|
| 288 |
|
|
}
|
| 289 |
|
|
|
| 290 |
|
|
static void describe_elf_interpreter(Elf32_Ehdr* ehdr)
|
| 291 |
|
|
{
|
| 292 |
|
|
Elf32_Phdr *phdr;
|
| 293 |
|
|
phdr = elf_find_phdr_type(PT_INTERP, ehdr);
|
| 294 |
|
|
if (phdr) {
|
| 295 |
|
|
printf("Interpreter:\t%s\n", (char*)ehdr + byteswap32_to_host(phdr->p_offset));
|
| 296 |
|
|
}
|
| 297 |
|
|
}
|
| 298 |
|
|
|
| 299 |
|
|
int main( int argc, char** argv)
|
| 300 |
|
|
{
|
| 301 |
|
|
/* map the .so, and locate interesting pieces */
|
| 302 |
|
|
char *dynstr;
|
| 303 |
|
|
char *thefilename = argv[1];
|
| 304 |
|
|
FILE *thefile;
|
| 305 |
|
|
struct stat statbuf;
|
| 306 |
|
|
Elf32_Ehdr *ehdr = 0;
|
| 307 |
|
|
Elf32_Shdr *dynsec;
|
| 308 |
|
|
Elf32_Dyn *dynamic;
|
| 309 |
|
|
|
| 310 |
|
|
if (argc < 2 || !thefilename) {
|
| 311 |
|
|
fprintf(stderr, "No filename specified.\n");
|
| 312 |
|
|
exit(EXIT_FAILURE);
|
| 313 |
|
|
}
|
| 314 |
|
|
if (!(thefile = fopen(thefilename, "r"))) {
|
| 315 |
|
|
perror(thefilename);
|
| 316 |
|
|
exit(EXIT_FAILURE);
|
| 317 |
|
|
}
|
| 318 |
|
|
if (fstat(fileno(thefile), &statbuf) < 0) {
|
| 319 |
|
|
perror(thefilename);
|
| 320 |
|
|
exit(EXIT_FAILURE);
|
| 321 |
|
|
}
|
| 322 |
|
|
|
| 323 |
|
|
if ((size_t)statbuf.st_size < sizeof(Elf32_Ehdr))
|
| 324 |
|
|
goto foo;
|
| 325 |
|
|
|
| 326 |
|
|
/* mmap the file to make reading stuff from it effortless */
|
| 327 |
|
|
ehdr = (Elf32_Ehdr *)mmap(0, statbuf.st_size,
|
| 328 |
|
|
PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(thefile), 0);
|
| 329 |
|
|
|
| 330 |
|
|
foo:
|
| 331 |
|
|
/* Check if this looks legit */
|
| 332 |
|
|
if (check_elf_header(ehdr)) {
|
| 333 |
|
|
fprintf(stderr, "This does not appear to be an ELF file.\n");
|
| 334 |
|
|
exit(EXIT_FAILURE);
|
| 335 |
|
|
}
|
| 336 |
|
|
describe_elf_hdr(ehdr);
|
| 337 |
|
|
describe_elf_interpreter(ehdr);
|
| 338 |
|
|
|
| 339 |
|
|
dynsec = elf_find_section_type(SHT_DYNAMIC, ehdr);
|
| 340 |
|
|
if (dynsec) {
|
| 341 |
|
|
dynamic = (Elf32_Dyn*)(byteswap32_to_host(dynsec->sh_offset) + (intptr_t)ehdr);
|
| 342 |
|
|
dynstr = (char *)elf_find_dynamic(DT_STRTAB, dynamic, ehdr, 0);
|
| 343 |
|
|
list_needed_libraries(dynamic, dynstr);
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
return 0;
|
| 347 |
|
|
}
|
| 348 |
|
|
|
